TWI540989B - The mounting structure of the optional components of the chair foot - Google Patents

Description

Mounting structure of selected members of chair legs Field of invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for an optional member of a chair leg for attaching a member such as a pedal to a foot of a chair at an adjustable height.

Background of the invention

For example, in a child's chair for learning in the home, there is a child's foot that prevents the sitting child from being attached to the foot of the support base, and various items are available. The foot is adjusted to adjust the height of the child's growth, or is unnecessarily removed (for example, refer to Patent Documents 1 to 3).

Advanced technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2007-181614

Patent Document 2 Japanese Utility Model Registration Gazette No. 3097290

Patent Document 3 Japanese Utility Model Registration Gazette No. 3143021

Summary of invention

Since the footsteps described in the above Patent Documents 1 to 3 are provided in the engaging recesses of the mounting portions that are fixed to the center portion of the leg column in the vertical direction and the rear opening, there is a case where the foot column is fitted with the foot mounting portion. The diameter can be easily performed from the side in the state in which the seat is attached to the leg, and the removal is easy.

However, any of the above steps is a screw receiving member mounting fastening mechanism provided at an opening end of the engaging recess of the mounting portion, and the fastening mechanism causes the inner surface of the engaging recess to be crimped to the outer circumference of the leg The foot is fixed to the foot column, and the height of the foot can be adjusted by loosening the fastening mechanism.

Therefore, when the child or the like inadvertently loosens the fastening mechanism, or the fastening mechanism is slightly loosened during use of the chair, the pedal immediately moves in the up and down direction, or horizontally rotates around the foot column, and the pedal is installed. The position is offset from the foot.

Further, in the pedal described in Patent Document 3, the screw receiving member (clamping member) is protruded to the opening end of the opening portion, and is attached to the opening end portion of the engaging recess portion, and the screw receiving member is largely exposed at the rear. The appearance of the pedal is poor and the design of the chair is not good.

Further, in the mounting structure of the foot column and the pedal according to each of the above-mentioned patent documents, since the pedal is not positioned in the rotational direction or the anti-rotation mechanism, the pedal is positioned at a predetermined position. The positioning work at the time of mounting on the foot column is troublesome, and when the fastening mechanism is slightly loosened, there is a foot pedal that is rotated around the foot column and the position is deviated.

In addition, in order to adjust the height of the pedal as a child, it is preferable to provide a display such as a scale that can confirm the upper and lower positions of the pedal or a sticker with a scale on the outer surface of the foot, but the foot of the above-mentioned patent document Since the columns are formed in a cylindrical shape with a smooth outer peripheral surface, when the display portion such as the scale is directly provided on the outer peripheral surface of the above-described foot column, when the height of the pedal is adjusted, the display portion is rubbed and rubbed off, and it is difficult to view the scale. Hey.

The present invention has been made in view of the above problems, and a first object thereof is to provide a mounting structure of an optional member for a chair leg, and the selection of the chair leg In the mounting structure of the member, even if the fastening mechanism is loosened, the position of the member can be prevented from being displaced in the up-and-down direction or the rotation of the member, and the screw receiving member or the like can be prevented from being largely exposed from the outer periphery of the mounting portion. The side is made, and the design of the selected member and the design of the chair are improved.

Further, a second object is to provide a mounting structure of a chair leg and a member for selecting a leg which are easy to position when the member is mounted and which is provided on the outer peripheral surface of the leg without being worn away by the member.

According to the present invention, the first object described above is achieved as follows.

(1) A mounting structure for an optional member of a chair leg, which is attached to an attachment portion of an optional member to be mounted on a leg of a chair, and is provided in an engaging recessed portion that is open in the up-and-down direction and on one side, and the engaging recess is embedded Cooperating with the leg of the chair, and sandwiching the leg with the pressing member disposed in the engaging recess and the inner surface of the engaging recess opposite thereto, the pressing member is tightly disposed on the selecting member The fixing mechanism is fastened to the inside of the engaging recessed portion, whereby the optional member is attached to the leg, and the plurality of engaging grooves or engaging protrusions are arranged in the circumferential direction in the vertical direction on the outer peripheral surface of the leg. And providing one of the inner surface of the pressing member opposite to the leg and the inner surface of the engaging recess to be selectively engaged with the engaging groove or the engaging protrusion Engage the ridge or the snap groove.

According to this configuration, the engagement protrusion or the engagement groove provided in any one of the inner surface of the pressing member and the inner surface of the engagement recess is fitted to the outer circumferential surface of the leg and is oriented in the circumferential direction. In the state of the engaging groove or the engaging ridge, the fastening member is attached to the outer surface of the leg by the fastening mechanism, thereby even The fastening mechanism is loosened and there is no choice of the member to move in the up and down direction.

(2) In the above item (1), the length of the engaging groove or the engaging protrusion provided on the outer peripheral surface of the leg and the inner surface of the pressing member and the inner surface of the engaging recess are The length of the snap protrusion or the engagement groove is almost equal.

According to this configuration, it is possible to prevent the member from being rotated around the column and the position is deviated.

(3) In the above item (1) or (2), the engagement protrusion or the engagement groove is provided below the inner surface of the engagement recess.

According to this configuration, when the fastening mechanism is loosened, the front end portion of the member is tilted and moved to the lower side, and the engagement protrusion or the engagement groove of the engagement recess and the engagement groove or the engagement of the foot column are engaged. The ridges are deeply fitted, so the components are not moved to the bottom casually.

(4) In any one of the above items (1) to (3), a plurality of upper and lower engagement grooves or engagement protrusions are respectively provided on the rear portion of the outer circumference of the foot column, and are provided on the pressing member. The inner surface and the engagement protrusion or the engagement groove of the inner surface of the engagement recess are engaged with the front and rear engagement grooves or the engagement protrusions.

According to this configuration, it is possible to surely prevent the selected member from being displaced from the position and stably attached to the outer peripheral surface of the leg.

(5) In any one of the above items (1) to (4), the engagement protrusion or the engagement groove provided in any one of the engagement recess and the pressing member is at least two upper and lower, and the The two can be selectively engaged with the two engaging grooves or the engaging protrusions of the foot column adjacent to each other.

According to this configuration, it is possible to prevent the selected member from being displaced from the outer peripheral surface of the foot column with a stable positional deviation.

(6) In any one of the above items (1) to (5), the fastening mechanism has a screw receiving member that is mounted on the outer side of the pressing member and that is attached to the engaging recessed portion and that is provided with a female screw hole that intersects the leg perpendicularly, and is screwed to the female screw hole And the fastening member that pushes the pressing member toward the leg at the front end portion accommodates the pressing member and the screw receiving member in the engagement recess.

According to this configuration, since at least the screw receiving member of the pressing member and the fastening mechanism is housed in the engaging recessed portion, it is possible to prevent the opening portion from being largely protruded from the opening portion of the engaging recessed portion to the outer side, and the optional member can be prevented. The design and the design of the chair are improved.

(7) In the above item (6), the inward projections are protruded from the mutually opposing portions in the engagement recesses, and the inward projections and the pair of the inward projections respectively Providing a locking protrusion to any of the opposing faces protruding between the outward protrusions of the both ends of the screw receiving member, and providing an engaging hole for engaging the protruding protrusion on the other opposing surface .

According to this configuration, even if the reaction force when the pressing member is fastened is applied to the screw receiving member, the opening portion of the engaging recess portion is not expanded to the outer side. Therefore, since the pressing member accommodated in the engaging recess can be prevented from swaying on the side and pushed toward the leg stably, the engaging protrusion or the engaging groove of the front end can be surely fitted to the leg The card fits the groove or the snap protrusion to engage.

Further, since the pressing member and the fastening mechanism can be prevented from falling off from the engagement recess, the workability at the time of assembly is excellent.

(8) In the above item (6) or (7), the recessed portion is provided in any one of the opposing portion of the pressing member and the screw receiving member, and the other opposing portion is fitted to the Concave.

According to this configuration, since the pressing member and the screw receiving member are brought close to each other, the engaging recessed portion and the mounting portion in which the engaging recessed portion is formed are reduced in size on the side, so that the shape of the member and the chair can be selected. The design is improved.

(9) In any one of the above items (1) to (8), the member is selected as a pedal.

According to this configuration, even if the fastening mechanism is loosened, the pedal to which the load of the foot is applied is moved to the lower side, and the pedal can be stably installed.

The above second object can be achieved by the following items.

(10) A chair leg mountable on an outer peripheral surface, wherein the outer peripheral surface is provided with a plurality of engaging grooves or engaging protrusions which are vertically and selectively engageable with the optional member and are oriented upward and horizontally in the horizontal direction. The non-formed portion of the engaging groove or the engaging ridge of the outer peripheral surface is provided with a groove facing the vertical direction, and the bottom surface of the groove is used as a display portion for displaying the mounting height of the optional member.

According to this configuration, the member can be attached to the outer peripheral surface of the leg by adjusting the height and preventing the position in the up-and-down direction from deviating.

Further, since the bottom surface of the groove provided on the outer peripheral surface is used as the display portion for displaying the mounting height of the optional member, when the height of the optional member is adjusted, the member is not brought into contact with the display portion, thereby preventing the display portion from being worn away. It is not easy to watch.

Further, by engaging one of the optional members with the groove, the groove can be used as a positioning or anti-rotation mechanism for the direction of rotation of the optional member.

(11) In the above item (10), the length of the engaging groove or the engaging protrusion is made The ends are terminated at both sides of the groove.

According to this configuration, even if a groove having a large width is provided, the selection member can be engaged with the engagement groove or the engagement protrusion in a wide range by the groove.

(12) In the above item (10) or (11), the engaging groove and the bottom surface of the groove are continuously formed in the same plane.

According to this configuration, since the step between the engaging groove and the groove does not cause a step difference, the forming of the leg and the processing of the groove are easy, and the display portion is also easily visually recognized from the outside.

(13) A mounting structure of an optional member of a chair leg according to any one of the above items (10) to (12), wherein the thickness in the up-and-down direction is smaller than the upper and lower sides of the groove provided on the outer peripheral surface of the leg The mounting portion of the selected member of the size is provided in an engaging recessed portion that is open in the up-and-down direction and one side, and the engaging recessed portion is fitted to the leg of the chair, and the pressing member disposed in the engaging recessed portion and the like Engaging the leg on the inner surface of the engaging recessed portion, and engaging or disengaging the engaging protrusion or the engaging groove provided in at least one of the opposing faces of the pressing member and the engaging recessed portion The engaging groove or the engaging protrusion of the leg is fastened to the inside of the engaging recess by a fastening mechanism provided on the optional member, and the pressing member and the engaging recess are opposed to each other The pressing surface is pressed against the outer peripheral surface of the leg, whereby the optional member is attached to the leg.

According to this configuration, the engagement protrusion or the engagement groove provided on either the inner surface of the pressing member and the inner surface of the engagement recess is engaged with the engagement groove provided on the outer circumferential surface of the leg or In the state of engaging the ridges, the selection member is attached to the outer peripheral surface of the leg by a fastening mechanism, thereby generating even the fastening mechanism When loosened, there is no choice of moving the member in the up and down direction.

Further, since the pressing surface of the opposing surface of the pressing member and the engaging recess is pressed against the outer peripheral surface of the leg, the member can be attached to the leg stably and firmly.

(14) In the above item (13), the engagement protrusion of the pressing member and the opposing surface of the engagement recess is engaged with the both side edges of the groove of the leg.

According to this configuration, the optional member can be positioned in the rotational direction to be easily attached to the foot column, and even if the fastening mechanism is loosened, the member can be prevented from being rotated around the column.

(15) In the above item (13) or (14), the protruding protrusion of the engaging protrusion provided in the engaging recess or the pressing member is smaller than the depth of the engaging groove and the groove of the leg.

According to this configuration, the front end of the engaging projection provided in the engaging recess or the pressing member does not abut against the engaging groove of the leg and the bottom surface of the groove, and strongly presses the engaging groove and the concave of the thin-footed leg. The bottom of the groove prevents deformation of the column.

(16) In any one of the above items (13) to (15), the engagement protrusion or the engagement groove provided in the pressing member is at least two upper and lower, and the selection is engaged with the foot column. The two engaging grooves or the engaging protrusions are adjacent to each other, and a pressing protrusion that presses the outer peripheral surface of the leg is provided between the upper and lower engaging grooves or the engaging protrusions.

According to this configuration, since the positional deviation of the member in the up-and-down direction is prevented from being more stably attached to the outer peripheral surface of the leg, and between the two engaging grooves or the engaging protrusions adjacent to each other, the pressing of the pressing protrusion is performed. The surface is crimped to the outer surface of the foot column in a wide range, so that the mutual contact area is large, and the frictional force can be made large. (17) In any one of the above items (13) to (16), the member is selected as the pedal.

According to this configuration, even if the fastening mechanism is loosened, the foot that is applied by the load without the foot is moved downward, and the pedal can be stably attached to the foot.

Simple illustration

Fig. 1 is a front perspective view of a chair including a foot mounted in the first embodiment of the mounting structure of the present invention.

Fig. 2 is an enlarged perspective view showing the main part of the chair when the pedal is mounted in the same manner.

Fig. 3 is an exploded perspective view showing the main part of the chair before the pedal is mounted in the same manner.

Fig. 4 is an enlarged central longitudinal sectional side view of the fastening mechanism of the foot mounting portion in the same manner.

Fig. 5 is a magnified central longitudinal sectional side view when the fastening mechanism is similarly fastened.

Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 4.

Fig. 7 is a cross-sectional view taken along line VII-VII of Fig. 5.

Fig. 8 is a front perspective view of a chair including a footrest attached to a second embodiment of the mounting structure of the present invention.

Fig. 9 is an enlarged perspective view showing the main part of the chair when the pedal is mounted in the same manner.

Fig. 10 is an exploded perspective view showing the main part of the chair in front of the pedal in the same manner.

Fig. 11 is an enlarged perspective view of the pressing member in the front.

Fig. 12 is an enlarged center longitudinal sectional side view of the foot mounting portion.

Figure 13 is a cross-sectional view taken along line XIII-XIII of Figure 12.

Figure 14 is a cross-sectional view taken along line XIV-XIV of Figure 12.

Fig. 15 is a cross-sectional view showing the same portion as the thirteenth embodiment of the third embodiment of the present invention.

Form for implementing the invention

Hereinafter, embodiments of the present invention will be described based on the drawings.

Fig. 1 is a front perspective view of a chair including a footrest attached to a first embodiment of the mounting structure of the present invention, the chair including a foot having five casters 2 having a caster 1 at a distal end portion and facing in a radial direction. The body 3, the leg 4 which is erected at the center thereof, and the base 5 which is attached to the support seat (not shown) of the upper end of the leg 4 so as to be horizontally rotatable, and which are oriented downward by the left and right pairs The back frames 7, 7 are attached to the backrests 8 of the back bars 6, 6 which rise from the both side portions of the rear end portion of the support base.

As shown in Fig. 4, the leg 4 is attached to the upper end of the telescopic leg 9 of the support base, the lower end is fixed to the center of the leg body 3, and the air spring 10 that extends the telescopic leg 9 accommodated therein is covered, and the gas spring 10 is covered. The lower end portion is fixed to the center of the leg body 3 and is composed of a cylindrical cover leg 11 made of synthetic resin.

As shown in Fig. 2 to Fig. 4, the outer peripheral surface of the front and rear outer peripheral surfaces of the cover leg 11 are arranged in a circular arc shape in the horizontal direction, and the plurality of engaging grooves 12 are connected to each other so as to be mutually coupled with each other. The interval is formed.

Further, as shown in Fig. 6, on the right side surface of the cover leg 11, the slit 13 in the up-and-down direction is formed from the vicinity of the upper end portion to the lower end, and the cover leg 11 can be reduced in the diameter direction. The amount of groove width of the slit 13 is elastically deformed.

The footrest 14 for the optional member is mounted to the foot 11 as follows.

As shown in FIGS. 2 to 7, the footrest 14 has a mounting portion 15 that can be fixed to the foot portion 11 of the center portion, and has an outer peripheral surface facing the front of the chair (the left side of FIG. 4) and both sides. Three connecting rods 16 extending in a radial shape, a pedal portion 17 connected to the front end of each connecting rod 16 and having a C-shape viewed from a plane centered on the mounting portion 15 for fastening the mounting portion 15 to the cover A fastening mechanism 18 on the outer circumference of the foot 11.

The mounting portion 15 has a pair of left and right holding pieces 15a and 15a which are formed to be parallel to each other and which are disposed rearward, and a U-shaped engaging recess 19 which is formed rearwardly in the rear and in the upper and lower directions, and which faces the rearward U-shaped engaging recess 19, the engaging recess 19 The semicircular inner peripheral surface on the front side is in surface contact with the outer peripheral surface of the front half of the cover leg 11.

An engaging protrusion 20 is protruded from the inner surface of the lower portion of the front portion of the engaging recess 19, and the engaging protrusion is selected from the front side to be engaged with the plurality of engaging grooves 12 on the front side of the foot 11 and is formed and engaged. The grooves 12 have a horizontal arc shape of approximately the same length.

The inward end portions 21 and 21 are opposed to each other at the opening end portion of the engaging recess portion 19, that is, the opposite end portions of the rear end portions of the two holding pieces 15a of the mounting portion 15, and the two-inward inner protruding portion 21 is opposite to the foot. The column 4 faces the front surface, and the locking projections 22 and 22 that face in the up and down direction are protruded forward. Further, the dimension between the opposing faces of the two-way inner protrusions 21, 21 is slightly larger than the outer diameter of the telescopic leg 9 of the leg 4, and the mounting portion 15 can be fitted in any direction perpendicularly intersecting the telescopic leg 9 .

The longitudinal and cross-sectional shape constituting the front opening is The box-shaped synthetic resin box-shaped pressing member 23 is housed in the engaging recessed portion 19 of the mounting portion 15 in a state facing the back of the foot 11 .

The fastening mechanism 18 is composed of a synthetic resin screw receiving member 24 that is fitted in a state in which the portion is closed in the opening end portion behind the engaging recess portion 19, and a fastening screw 25 that is screwed into the inside of the nut 30. The rear portion of the pressing member 23 is fitted to the concave portion 24b provided on the front surface of the screw receiving member 24 so as to be relatively movable. Further, when the upper and lower dimensions of the pressing member 23 and the screw receiving member 24 are such that they are engaged with the engaging recess 19, they do not protrude from the upper and lower surfaces of the mounting portion 15, but are slightly smaller than the upper and lower dimensions of the mounting portion.

The front end portion of the pressing member 23 facing the inner surface of the cover member 11 and the upper portion 23a, 23a above and below the pressing member 23 is adjacent to each other after being selectively engaged with the rear surface of the cover leg 11 from the rear. The horizontal arc-shaped engaging protrusions 26 and 26 of the length of the upper and lower engaging grooves 12 and almost the same as the engaging groove 12. Further, when the pressing member 23 is housed in the engaging recess 19 of the mounting portion 15, the engaging protrusion 26 at the lower portion of the pressing member 23 and the engaging protrusion protruding from the inner peripheral surface of the lower portion before the engaging recess 19 are formed. 20 integrated into the same height.

The fastening screw 25 is composed of an operation knob 27 made of a synthetic resin for screwing operation, and a bolt 28 which is fixed to the center portion of the operation knob 27 and which is inserted toward the front, and the bolt 28 is inserted into the screw receiving member 24 from the rear. The center portion and the through hole 29 facing the front-rear direction are screwed to the nut 30 which is inserted and formed and fixed to the inside of the screw receiving member 24. Further, instead of the nut 30, the screw receiving member 24 may be provided with a female screw hole through which the bolt 28 is screwed.

A small diameter shaft 28a is protruded from the front end of the bolt 28.

The long holes 31, 31 formed behind the both side portions of the pressing member 23 and above and below the rear opening are viewed from the rear fitting plane The front pieces 32a and 32a on the left and right sides of the metal member 32 are pressed against the back surface of the pressing member 23 after pressing the metal part 32. In addition, the case of pressing the metal part 32 is also omitted.

The small-diameter shaft 28a of the bolt 28 is rotatably fitted to the through-holes 33 and 33 formed in the rear surface of the pressing member 23 and the center portion of the pressing metal member 32 from the rear, and the E-ring 35 is used after the fitting. The annular groove 34 is fixed to the front end of the small diameter shaft 28a, and the fastening screw 25 can be fastened to the rear.

The outwardly projecting portions 24a and 24a projecting from the intermediate portions of the both side faces of the screw receiving member 24 are formed in the engaging holes 36 and 36 which are opened in the opposite direction to the locking projection 22, and the engaging holes 36 are provided. The locking projections 22 and 22 that are fitted to the front end of the attachment portion 15 are fitted, thereby preventing the screw receiving member 24 from moving in the vertical direction and falling off in the engagement recess 19 of the attachment portion 15.

Further, the left and right outward projections 24a and 24a are in contact with the front surfaces of the left and right inward projections 21 and 21, and the screw receiving member 24 is fastened to the rear and fitted to the opening end of the engagement recess 19.

To attach the pedal 14 to the leg 4, the engaging recess 19 of the mounting portion 15 is first fitted to the telescopic leg 9 from the front of the chair.

Then, in this state, the pressing member 23, the pressing metal fitting 32, the screw receiving member 24, and the fastening screw 25 which are previously assembled to the engaging recessed portion 19 formed behind the telescopic leg 9 are fitted to the foot 11 Facing the direction. At this time, by engaging the engaging holes 36 and 36 of the both side portions of the screw receiving member 24 in the left and right locking projections 22 and 22 at the opening end portions of the engaging recess 19, the pressing member 23 and the screw receiving member can be prevented. 24 and the fastening screws 25 are all detached from the engagement recesses, and are held in the engagement recesses 19 in a false manner.

Next, as shown in Figures 4 and 6, loosen the fastening screw 25 and press it. After the pressing member 23 moves to the vicinity of the rear end in the rear direction, the footrest 14 is lowered, and the inner surface of the engaging recessed portion 19 of the attaching portion 15 and the front end of the pressing member 23 grip the outer peripheral surface of the cover leg 11.

Then, the engagement protrusions 20 on the inner surface of the engagement recess 19 and the upper and lower engagement protrusions 26 and 26 at the front end of the pressing member 23 are selectively engaged from the front and the rear to the front surface and the rear surface of the cover foot 11 respectively. One of the engagement grooves 12.

When the fastening screw 25 is screwed in this state, as shown in FIGS. 5 and 7 , the front end surface of the bolt 28 pushes the pressing metal member 32 and the pressing member 23 to the front, and is provided in the engaging recess 19 . The engaging protrusion 20 is strongly engaged with one of the engaging grooves 12 on the front surface of the cover leg 11, and the engaging protrusions 26 and 26 at the front end of the pressing member 23 are strongly engaged with the lower surface of the cover 11 Two adjacent engagement grooves 12 and 12.

Thereby, the footrest 14 is fixed to any height of the foot 11 . At this time, since the circumferential surface of the cover leg 11 is provided with the slit 13 in the up-and-down direction, the pressing load when the fastening screw 25 is tightened is released by the slit 13, so that the fastening portion of the cover 11 can be prevented from being partially deformed into an elliptical shape. Wait.

When the height of the footrest 14 is adjusted, the fastening screw 25 is loosened, and the front and rear engagement protrusions 20 and 26 are fitted to any of the engagement grooves 12 on the front and rear sides of the cover leg 11, and the fastening screw 25 can be screwed in. Thereby, the height of the footrest 14 can be adjusted stepwise. Further, in order to confirm the height of the footrest 14, a scale sticker 37 with a scale attached to the height is attached to the left side surface of the footrest 11.

As described above, in the pedal mounting structure according to the first embodiment, a plurality of circular arc-shaped cards facing the circumferential direction are provided on the front and rear surfaces of the outer peripheral surface of the foot 11 which constitutes one of the legs 4 Groove 12 and make An arc-shaped engaging protrusion 20 provided on the inner surface of the engaging recess 19 of the pedal 14 and having the same length as the engaging groove 12, and an arc of the same length as the engaging groove 12 of the front end portion of the pressing member 23 The engagement protrusions 26 and 26 are engaged with the arbitrary engagement grooves 12, and the footrest 14 is fixed to the cover leg 11, so that even if the fastening screw 25 is slightly loosened, there is no pedal 14 in the up and down direction. Move, or swivel around the cover foot 11. Therefore, the position of the footrest 14 to the foot 11 can be prevented from being separated.

Further, since the pressing member 23 and the screw receiving member 24 are housed in the engaging recessed portion 19 of the mounting portion 15 of the footrest 14, it is possible to prevent the mounting portion 15 from being largely protruded and exposed, and the appearance of the pedal 14 can be improved. And the design of the chair.

Further, since the inward protrusions 21 and 21 projecting from the end portions of the two holding pieces 15a of the mounting portion 15 are provided with the locking projections 22 and 22 facing forward, and are provided on both sides of the screw receiving member 24. The engaging holes 36 and 36 that are open at the rear are engaged with the locking projections 22, so that even if the reaction force when the pressing member 23 is tightened is applied to the screw receiving member 24, the opening of the engaging recess 19 is not provided. The end is expanded to the outer side. Therefore, the pressing member 23 accommodated in the engaging recessed portion 19 can be prevented from swaying in the left-right direction, and can be stably pushed toward the cover leg 11, so that the engaging protrusion 26 of the front end portion can be surely fitted to the cover leg. The card of the 11 is closed by the groove 12.

Further, when the engagement hole 36 of the screw receiving member 24 is engaged with the locking projection 22 of the attachment portion 15, the pressing member 23 and the fastening mechanism 18 can be prevented from falling off from the engagement recess 19, so that assembly is performed. Good workability.

The present invention is not limited to the above embodiments.

In the above embodiment, the engagement groove is provided on the front and rear sides of the cover leg 11 12, and the inner surface of the engaging recess 19 provided on the pedal 14 and the engaging protrusions 20 and 26 of the pressing member 23 are engaged with each other, or only the engaging groove 12 may be provided in any of the front and rear. The engaging protrusion 20 of the engaging recess 19 of the pedal 14 or the engaging protrusion 26 of the pressing member 23 is engaged with the engaging groove 12. The engagement groove 12 can also be non-horizontal or can be oriented in a spiral direction.

Further, contrary to the above embodiment, the engagement groove 12 of the cover leg 11 is an engagement projection, and the engagement projections 20 and 26 of the engagement recess 19 and the pressing member 23 are the engagement grooves. At this time, the opposing surface of the pressing member 23 and the foot 11 is an arc-shaped curved surface, and the engaging protrusion may be protruded from the front surface.

Further, in the above-described embodiment, one engagement projection 20 is provided on the inner surface of the engagement recess 19 of the footrest 14, and the engagement projection 20 can be placed up and down in the same manner as the pressing member 23. These are engaged in the two adjacent engagement grooves 12 above and below the front. When this is done, the positional deviation of the footrest 14 can be surely prevented from being stably attached to the outer peripheral surface of the footrest 11. Further, there are cases where the engagement protrusions 20 and 26 are provided in two or more.

In the above-described embodiment, the inward projections 21 and 21 projecting from the opening end portions of the engagement recesses 19 are provided with the locking projections 22 and 22 facing forward, and are provided on both sides of the screw receiving member 24. The engaging holes 36 which are open to the rear projections 24a and 24a and which are open at the rear are fitted to the two locking projections 22, and instead of the outward projections 24a, the rearward locking projections 22 are provided. Further, an engaging hole 36 is provided in front of the inward projection 21 so that the two are fitted to each other.

Next, a second embodiment of the mounting structure of the member selected in the present invention will be described with reference to Figs. 8 to 14 .

Figure 8 is an illustration of the installation of the second embodiment of the present invention. A perspective view of a chair with a footrest of a member, the chair including a leg body 102 composed of five leg members 101 having a caster 100 at a front end portion and facing the radial direction, and a leg 103 erected in the center thereof for horizontal rotation The seat body 104 supported by the support base (not shown) attached to the upper end of the leg 103 is attached to the back frame 106 and 106 facing downward by the pair of right and left sides, and is attached to both sides of the rear end portion from the support base. The upper ends of the raised back bars 105, 105 are backed by 107.

As shown in Fig. 12, the leg 103 has a telescopic leg 108 to which the support base is attached at the upper end, a lower end portion fixed to the center of the leg body 102, and a gas spring 109 for elongating the telescopic leg 108 accommodated therein, covering the gas spring 109. The lower end portion is fixed to the center of the leg body 102 and is composed of a cylindrical cover leg 110 made of synthetic resin.

As shown in Fig. 10 and Fig. 13, in the outer peripheral surface of the rear portion of the cover leg 110, the vertically long rectangular groove 111 is formed almost horizontally.

Further, in the outer peripheral surface other than the groove 111 of the cover leg 110, the plurality of engagement grooves 112 in the arc shape in the horizontal direction are connected to the groove 111, that is, both ends of the circumferential direction of the engagement groove 112. The two sides of the groove 111 are terminated, and the groove 111 and the bottom surface of each of the engagement grooves 112 are continuous with each other on the same surface, and are formed at regular intervals.

The bottom surface of the groove 111 serves as a display portion 113 for displaying the mounting height of the pedal 117, which will be described later. In the present embodiment, the display portion 113 is attached with a scale sticker 115 attached as a step-adjusting foot. The standard scale 114 at the height of step 117. The scale 114 is attached to a position that is equal to each of the engagement grooves 112. In addition, when the cover leg 110 is formed, a scale may be directly provided on the bottom surface of the groove 111 instead of the scale sticker 115.

As shown in Fig. 13, in front of the cover leg 110, the seam facing the up and down direction The gap 116 is formed from the vicinity of the upper end portion to the lower end, and the cover leg 110 elastically deforms the groove width of the slit 116 in the diameter reducing direction.

The footrest 117 as an optional member is attached to the foot 110 as follows.

As shown in FIGS. 9 to 14 , the footrest 117 has a mounting portion 118 formed at a central portion thereof and having a thickness in the up-and-down direction that is smaller than the upper and lower dimensions of the recess 111 provided in the cover 110 and can be fixed to the cover 110. The three connecting rods 119 extending radially from the outer peripheral surface toward the front of the chair (the left side of FIG. 11) and the two side edges are connected to the front end of each connecting rod 119 and centered on the mounting portion 118. The pedal portion 120 having a C-shape and a fastening mechanism 121 for fastening the mounting portion 118 to the outer peripheral surface of the foot 110 are viewed in plan.

The mounting portion 118 has a pair of left and right holding pieces 118a and 118a which are formed to be parallel to each other and which are rearward and rearward, and a U-shaped engaging recessed portion 122 which is formed rearwardly in the rear and in the upper and lower directions, and which faces the rearward U-shaped engaging recess 122, before the engaging recessed portion 122 The semicircular inner peripheral surface on the side of the portion may be in surface contact with the outer peripheral surface of the front half of the foot 110.

An engaging protrusion 123 is protruded from the inner surface of the lower portion of the front portion of the engaging recess 122. The engaging protrusion is selectively engaged with the plurality of engaging grooves 112 from the front side of the foot 110 and forms a horizontal arc. shape. In addition, the protruding dimension of the engaging protrusion 123 is slightly smaller than the depth of the engaging groove 112, and when the engaging protrusion 123 is engaged with the engaging groove 112, the front end of the engaging protrusion 123 is not abutted. The bottom surface of the groove 112.

At the opening end of the engaging recess 122, that is, the opposing surface of the rear end portion of the two holding pieces 118a of the mounting portion 118, the inward protruding portions 124, 124 are protruded in an opposing shape, and the two inward projections 124 are formed. The leg 103 is opposed to the front surface, and the locking projections 125 and 125 that face in the up and down direction are protruded forward. In addition, the two-way inner protrusion 124, The dimension between the opposing faces of 124 is slightly larger than the outer diameter of the telescopic leg 108 of the leg 103, and the mounting portion 118 can be fitted in either direction perpendicular to the telescopic leg 108.

The longitudinal and cross-sectional shape constituting the front opening is The box-shaped synthetic resin box-shaped pressing member 126 is housed in the engaging recessed portion 122 of the mounting portion 118 in a state facing the back of the foot 110.

The fastening mechanism 121 is composed of a synthetic resin-made screw receiving member 127 that is fitted in a state in which the portion is closed in the opening end portion behind the engaging recessed portion 122, and a fastening screw 128 that is screwed into the inside thereof and is screwed in the nut 134. The rear portion of the pressing member 126 is fitted to the concave portion 127b provided on the front surface of the screw receiving member 127 so as to be relatively movable. Further, the upper and lower dimensions of the pressing member 126 and the screw receiving member 127 are such that they are not protruded from the upper and lower surfaces of the mounting portion 118 when they are fitted to the engaging recess portion 122, and are slightly smaller than the upper and lower dimensions of the mounting portion.

As shown in the enlarged perspective view of Fig. 11, in the opposing portion of the pressing member 126 and the rear surface of the cover leg 110, the left and right pair of pressing protrusions 129, 129 are protruded forward, and the front faces of the two pressing protrusions 129 are available. An arcuate pressing surface 129a that is in contact with the outer peripheral surface of the groove 111 is formed on the rear surface of the cover leg 110. Further, the left and right pressing protrusions 129 may be continuous in a space required to be inserted into the E-ring 139 to be described later, or the entire left and right pressing protrusions 129 may be an arc-shaped pressing surface 129a.

At the upper edge and the lower edge of the pressing member 126, the upper and lower pairs of the front sheets 130 and 130 are integrally formed with the left and right pressing protrusions 129 from above and below, and the ratio of the two forward sheets 130 to the pressing protrusions 129 The arc-shaped pressing surface 129a slightly protrudes to the front front end portion as a rear-selectable engagement with the foot 110 The two adjacent engagement grooves 112 and the horizontally arc-shaped engagement protrusions 130a and 130a are disposed above and below the surface. The size of the two engaging protrusions 130a protruding from the arcuate pressing surface 129a is slightly smaller than the depth of the engaging groove 112, and when the arcuate pressing surface 129a of the pressing protrusion 129 abuts against the outer peripheral surface of the foot 110, The front end of the engaging protrusion 130a does not abut against the bottom surface of the groove 111 and the engaging groove 112.

Further, the lower engagement projection 130a is integrated with the engagement projection 123 projecting from the inner circumferential surface of the lower portion of the engagement recess 122 at the same height.

The fastening screw 128 is composed of an operation knob 131 made of a synthetic resin for the rotary operation, and a bolt 132 that is fixed to the center portion of the operation knob 131 and is formed toward the front, and the bolt 132 is inserted from the rear into the center of the screw receiving member 127. The through hole 133 is formed in the front-rear direction, and is screwed to the nut 134 which is inserted and fixed to the inside of the screw receiving member 127. In addition, the screw receiving member 127 may be provided with a female screw hole for screwing the bolt 132 instead of the nut 134.

The front end of the bolt 132 is formed as a small diameter shaft 132a.

The long holes 135 and 135 formed in the lower direction of the rear side of the pressing member 126 and in the lower direction of the rear opening are viewed from the rear fitting plane. The front pieces 136a and 136a on the left and right sides of the metal member 136 are pressed against the back surface of the pressing member 126. In addition, the case of pressing the metal part 136 is also omitted.

The small diameter shaft 132a of the bolt 132 is rotatably fitted to the through holes 137 and 137 formed in the rear surface of the pressing member 126 and the center portion of the pressing metal member 136 from the rear, and the E-ring 139 is attached after the fitting. The annular groove 138 is fixed to the front end of the small diameter shaft 132a, and the fastening screw 128 can be fastened to the rear.

The outward protrusions 127a and 127a protruding from the intermediate portions of the both side faces of the screw receiving member 127 are formed in the engaging holes 140 and 140 which are opened in the opposite direction to the locking protrusion 125, and are engaged by the two. The hole 140 is fitted to the locking protrusions 125 and 125 that face the rear end of the mounting portion 118, and prevents the screw receiving member 127 from moving in the up-and-down direction in the engaging recess 122 of the mounting portion 118 (refer to 13 picture).

Further, the left and right outward projections 127a and 127a are in contact with the front surfaces of the left and right inward projections 124 and 124, and the screw receiving member 127 is fastened to the rear and fitted to the opening end of the engagement recess 122.

To attach the pedal 117 to the leg 103, the engaging recess 122 of the mounting portion 118 is first fitted to the telescopic leg 108 from the front of the chair.

Then, in this state, the pressing member 126, the pressing metal fitting 136, the screw receiving member 127, and the fastening screw 128 which are previously assembled to the engaging recessed portion 122 formed behind the telescopic leg 108 are fitted to the foot 110 Facing the direction. At this time, by engaging the engaging holes 140 and 140 of the both side portions of the screw receiving member 127 in the left and right locking protrusions 125 and 125 at the opening end portions of the engaging recessed portion 122, the pressing member 126 and the screw receiving member can be prevented. The entire 127 and the fastening screws 128 are detached from the engagement recesses 122 and are held by the engagement recesses 122.

Then, the fastening screw 128 is loosened, and the pressing member 126 is moved to the rear side to the vicinity of the rear limit, and the pedal 117 is lowered, so that the inner surface of the engaging recessed portion 122 of the mounting portion 118 and the front surface of the pressing member 126 are held from the front and rear. The outer surface of the foot 110.

Next, the engaging protrusions 123 on the inner surface of the engaging recess 122 and the upper and lower engaging protrusions 130a and 130a of the front end portion of the pressing member 126 are respectively from the front and the rear. The square is selected to be engaged with any one of the plurality of engaging grooves 112 above the outer surface of the cover leg 110. Further, the pair of upper and lower engagement projections 130a of the pressing member 126 are engaged with the adjacent engagement grooves 112 in a state of traversing the concave groove 111.

When the fastening screw 128 is screwed in this state, as shown in FIGS. 12 to 14 , the front end surface of the bolt 132 pushes the pressing metal member 136 and the pressing member 126 to the front, and the front side of the engaging recess 122 is engaged. The arc-shaped pressing surface can strongly contact the outer peripheral surface of the front side of the foot 110, and the arc-shaped pressing surfaces 129a and 129a of the left and right pressing protrusions 129 and 129 of the pressing member 126 strongly contact the back surface of the foot 110. On the outer peripheral side of the side, the footrest 117 is firmly fixed to any height of the cover leg 110.

At this time, since the protruding size of the engaging protrusions 123 and 130a is slightly smaller than the depth of the engaging groove 112, the front ends of the engaging protrusions 123 and 130a are not pressed against the bottom surface of the engaging groove 112, and the pair may be Some gaps are formed in the face (refer to Fig. 12 and Fig. 14). Therefore, the engagement groove 112 and the engagement protrusions 123 and 130a have a function as a positioning mechanism and a drop prevention mechanism for stepwise adjusting the height of the footrest 117.

Since the slit 116 facing the up-and-down direction is provided on the outer peripheral surface of the cover leg 110, the pressing load when the fastening screw 128 is tightened is released by the slit 116, so that the fastening portion of the cover 110 can be prevented from being partially deformed into an elliptical shape or the like.

When the height of the footrest 117 is adjusted, the fastening screw 128 is loosened, and the front and rear engagement protrusions 123 and 130a are detached from the engagement groove 112, so that they are fitted into any other engagement groove 112, and then screwed in. The screw 128 can be tightened, whereby the height of the pedal 117 can be adjusted stepwise.

As described above, in the second embodiment described above, since the feet are formed The outer peripheral surface of the cover 110 of one of the columns 103 is provided with a plurality of engaging grooves 112 which are vertically oriented in the circumferential direction, and an arc-shaped engaging protrusion projecting from the inner surface of the engaging recess 122 of the step 117 is provided. 123 and a pair of arc-shaped engaging protrusions 130a and 130a provided on the front end portion of the pressing member 126 are engaged with the arbitrary engaging grooves 112, and the footrest 117 is fixed to the foot 110, so even The fastening screw 128 is slightly loosened, and the pedal 117 is not displaced in the up and down direction. In particular, it is possible to reliably prevent the load from being moved to the lower side due to the load or the weight of the foot mounted on the pedal 117.

In addition, the pedal 117 causes the inner surface of the front side of the engagement recess 122 to contact the outer peripheral surface of the front side of the foot 110, and the arcuate pressing surface 129a of the left and right pressing protrusions 129, 129 of the pressing member 126. The surface of the 129a is in contact with the outer peripheral surface on the rear side of the cover leg 110, and the cover leg 110 is pressed from the front and the rear. Therefore, the contact area between the pedal 117 and the pressing member 126 to the cover leg 110 is large, so that the pedal 117 can be firmly fixed. Fixed to the cover leg 110.

Further, at this time, the engaging protrusions 123 and the pressing member 126 protruding from the inner surface of the engaging recess 122 are not pressed against the bottom surface of the engaging groove 112 at the front end of the lower engaging protrusions 130a and 130a. Since the gap is formed between the equal portions, the concave groove 111 of the thin thickness of the cover 110 and the bottom surface of the engaging groove 112 are strongly pressed at the front end of the engaging protrusions 123 and 130a, and the forming portion of the engaging groove 112 of the foot 110 can be prevented. Deformation.

Further, a non-formed portion of the engagement groove 112 on the outer peripheral surface of the cover leg 110 is provided with a groove 111 facing the vertical direction, and a bottom surface of the groove 111 is used as the display portion 113, and the display portion 113 is attached thereto. As a standard scale sticker 115 for the stepwise adjustment of the pedal 117, when the height of the pedal 117 is adjusted, The opposing surface of the pressing member 126 and the cover 110 does not slidingly contact the surface of the scale sticker 115. Therefore, regardless of the height of the pedal 117 being repeatedly adjusted, the scale rubbing attached to the scale sticker 115 is not rubbed off. It's not easy to watch. Further, when the display unit 113 is directly provided with a scale, the same result can be obtained.

Fig. 15 is a cross-sectional plan view showing a third embodiment of the present invention. In the third embodiment, one or a plurality of upper and lower engaging projections are formed on the front surface of the pressing member 126 opposite to the groove 111 of the foot 110. The portion 141 is protruded forward, and the front end portion of the engaging projection portion 141 is detachably attached to the groove 111 from the rear and is slidable in the vertical direction. At this time, both side edges of the front end portion of the engaging projection portion 141 are preferably engaged with both side edges of the groove 111, and the front end of the engaging projection portion 141 does not abut against the bottom surface of the groove 111.

In this manner, when the front end portion of the engaging projection portion 141 is engaged with the both side edges of the groove 111, when the footrest 117 is attached to the foot 110, the positioning can be performed, and even if the fastening screw 128 is loosened, It is also possible to prevent the pedal 117 from rotating around the cover foot 110. In other words, by providing the engagement projection 141 to the pressing member 126, the groove can be used as the positioning and anti-rotation mechanism of the rotation direction of the pedal 117 instead of the display unit 113 of the second embodiment. Further, when the groove 111 is used as a positioning or anti-rotation mechanism, a scale sticker 115 may be attached to the bottom surface as the display portion 113. At this time, when the height of the pedal 117 is adjusted, the front end of the engagement protrusion 141 is prevented from coming into contact with the display unit 113, and the display unit 113 is worn away.

The present invention is not limited to the second and third embodiments described above.

In the second and third embodiments described above, the groove 111 is provided on the rear surface of the foot 110, and may be provided at any position on the outer circumferential surface of the foot 110. For example, When the groove 111 is provided on the front surface of the cover leg 110, the engagement protrusion 141 is provided on the inner surface of the engagement recess 122 opposite thereto, and the engagement protrusion 141 is engaged with the groove 111. Thereby, the pedal 117 can be prevented from rotating.

Further, in the second and third embodiments, the engagement groove 112 is formed to communicate with the groove 111 to form a round shape, and a discontinuous circle in which at least the engagement projections 123, 130a are engageable is formed. Arc-shaped situation. The engagement groove 112 may not be horizontal or may be oriented in a spiral direction.

Further, in the second and third embodiments, the inner surface of the engagement recess 122 of the pedal 117 and the pressing member 126 are provided with engagement projections 123 and 130a, and the engagement grooves 112 and 130a are engaged with each other. There is also a case where any one of the engaging protrusions 123, 130a is omitted.

Contrary to the above-described second and third embodiments, the engagement groove 112 of the cover leg 110 may be an engagement protrusion, and may be provided on the inner surface of the engagement recess 122 and the front surface of the pressing protrusion 129 of the pressing member 126. The snap protrusions snap into this.

In the case where the engagement protrusions 123 provided on the inner surface of the engagement recessed portion 122 of the pedal 117 are two or more of the upper and lower sides, the engagement protrusions 130a provided at the front end of the pressing member 126 are two or more. .

In the first to third embodiments described above, the present invention can also be applied to the case where the foot 11 and 110 of the leg are formed into a cylindrical shape and a non-circular leg such as an elliptical or angular cross section is formed.

Further, in the above-described first to third embodiments, the selection of the members is the steps of the pedals 14, 117, and the selection of other optional members, such as an article placing table or a tray for placing or accommodating small objects, is described. The present invention is also applicable to the members.

1,100‧‧‧ casters

2,101‧‧‧foot

3,102‧‧‧ foot body

4,103‧‧‧Foot

5,104‧‧‧ body

6,105‧‧‧ Back rod

7,106‧‧‧ Back frame

8,107‧‧‧back

9,108‧‧‧ Telescopic feet

10,109‧‧‧ gas spring

11,110‧‧‧foot

12,112‧‧‧Kap

13,116‧‧‧ gap

14,117‧‧‧ pedal

15,118‧‧‧Installation Department

15a, 118a‧‧‧挟

16,119‧‧‧links

17,120‧‧‧foot

18,121‧‧‧ fastening mechanism

19,122‧‧‧Clamping recess

20,26,123,130a‧‧‧Clamping protrusions

21,124‧‧‧Inward projections

22,125‧‧‧Clocks

23,126‧‧‧ Pressing members

23a, 32a, 130, 136a‧‧‧ forward film

24,127‧‧‧ Screw bearing members

24a, 127a‧‧‧Outward projection

24b, 127b‧‧‧ recess

25,128‧‧‧ fastening screws

27,131‧‧‧Operation knob

28,132‧‧‧Bolts

28a, 132a‧‧‧ Small diameter shaft

29,33,133,137‧‧‧through holes

30,134‧‧‧ nuts

31,135‧‧‧ long holes

32,136‧‧‧Press metal parts

34,138‧‧‧ring groove

35,139‧‧‧E-ring

36,140‧‧‧Knitting holes

37,115‧‧‧scale sticker

111‧‧‧ Groove

113‧‧‧Display Department

114‧‧‧scale

129‧‧‧ Pressing the protrusion

129a‧‧‧Arc-shaped pressing surface

141‧‧‧Clamping protrusion

Fig. 1 is a front perspective view of a chair including a foot mounted in the first embodiment of the mounting structure of the present invention.

Fig. 2 is an enlarged perspective view showing the main part of the chair when the pedal is mounted in the same manner.

Fig. 3 is an exploded perspective view showing the main part of the chair before the pedal is mounted in the same manner.

Fig. 4 is an enlarged central longitudinal sectional side view of the fastening mechanism of the foot mounting portion in the same manner.

Fig. 5 is a magnified central longitudinal sectional side view when the fastening mechanism is similarly fastened.

Fig. 6 is a cross-sectional view taken along line VI-VI of Fig. 4.

Fig. 7 is a cross-sectional view taken along line VII-VII of Fig. 5.

Fig. 8 is a front perspective view of a chair including a footrest attached to a second embodiment of the mounting structure of the present invention.

Fig. 9 is an enlarged perspective view showing the main part of the chair when the pedal is mounted in the same manner.

Fig. 10 is an exploded perspective view showing the main part of the chair in front of the pedal in the same manner.

Fig. 11 is an enlarged perspective view of the pressing member in the front.

Fig. 12 is an enlarged center longitudinal sectional side view of the foot mounting portion.

Figure 13 is a cross-sectional view taken along line XIII-XIII of Figure 12.

Figure 14 is a cross-sectional view taken along line XIV-XIV of Figure 12.

Fig. 15 is a cross-sectional view showing the same portion as the thirteenth embodiment of the third embodiment of the present invention.

1‧‧‧ casters

2‧‧‧foot

3‧‧‧ foot body

4‧‧‧Foot

9‧‧‧ Telescopic feet

10‧‧‧ gas spring

11‧‧‧ Covered feet

12‧‧‧Kap

14‧‧‧ pedal

15‧‧‧Installation Department

17‧‧‧foot

18‧‧‧ fastening mechanism

20,26‧‧‧Clamping protrusions

23‧‧‧ Pressing members

24‧‧‧screw bearing members

27‧‧‧Operation knob

28‧‧‧ bolts

30‧‧‧ Nuts

32‧‧‧Pressing metal parts

Claims (8)

A mounting structure for a foot of a chair, wherein the mounting portion of the foot is disposed in an up-and-down direction and an engagement recess that is open at one side, and the engagement recess is fitted to the leg of the chair and is disposed in the engagement The pressing member in the recess and the inner surface of the engaging recessed portion opposed thereto collide with the leg, and the pressing member is fastened to the inside of the engaging recess by a fastening mechanism provided on the pedal. In this case, the pedal is attached to the foot column, and the outer peripheral surface of the leg is arranged in the vertical direction and the circumferential direction, and a plurality of engaging grooves or engaging protrusions are formed in the horizontal direction and the circumferential direction, respectively. An inner surface of the pressing member facing the leg and an inner surface of the engaging recess are respectively provided with arc-shaped cards that are selectively engageable with the plurality of engaging grooves or the engaging protrusions of the upper and lower sides Joint or strip groove. The installation structure of the pedal of the chair of the first aspect of the patent application, wherein the length of the arcuate engagement groove or the engagement protrusion provided on the outer circumference of the leg is set to be engaged with the inner surface of the pressing member or the engagement The length of the engaging protrusion or the engaging groove on the inner surface of the recess is almost equal. The installation structure of the pedal of the chair of the first aspect of the patent application, wherein the engaging protrusion or the engaging groove is provided below the inner surface of the engaging recess. For example, in the installation structure of the pedal of the chair of the first aspect of the patent application, a plurality of upper and lower engaging grooves or engaging protrusions are respectively arranged on the rear part of the outer surface of the outer column of the foot column, and are disposed on the inner surface of the pressing member and The engaging protrusion or the engaging groove on the inner surface of the engaging recess is engaged with the engaging groove or the engaging protrusion of the front and rear. The mounting structure of the pedal of the chair of the first aspect of the patent application, wherein the engaging protrusion or the engaging groove provided in the engaging recess and the pressing member are at least two upper and lower, and the card can be selectively selected The two engaging grooves or the engaging protrusions are arranged adjacent to each other. The installation structure of the pedal of the chair of claim 1, wherein the fastening mechanism has a screw receiving member and a fastening screw, and the screw receiving member is opposite to the outer side of the pressing member and cannot be moved to the outside. The state of the side is installed in the engaging recess, and is provided with a female screw hole in a direction perpendicular to the leg, and the fastening screw is screwed to the female screw hole and the pressing member is directed to the column with the front end portion The pusher accommodates the pressing member and the screw receiving member in the engagement recess. The installation structure of the pedal of the chair of the sixth aspect of the patent application, wherein the inward projections are respectively protruded from the mutually opposite portions in the engagement recesses, and respectively in the two-directional inner protrusions, and The two-way inner protrusions are opposite to each other and protrude from the opposite sides of the outwardly protruding portions of the screw receiving members, and any one of the opposite faces is provided with a locking protrusion, and the other opposite surface is provided with a locking protrusion The engaging hole of the fitting. The pedal mounting structure of the chair of claim 6 is characterized in that a recess is provided in any one of the opposing portions of the pressing member and the screw receiving member, and the other opposing portion is fitted to the recess.