JP2008062014A - Chair - Google Patents

Abstract

A chair capable of performing manual work in a state in which a burden on a body (particularly an arm) is remarkably suppressed.
The chair includes a leg device 1 with casters, a saddle-shaped seat 3, and left and right elbow supports 5. The elbow support 5 is slidably attached to the tip of the branch frame 17 branched from the branch frame 17 so as to be horizontally rotatable. Since the elbow support 5 freely changes its position and posture following the movement of the user's arm, a person can perform various manual operations while the elbow is placed on the elbow support 5. For this reason, even work with objects can be performed in a state in which fatigue is significantly suppressed.
[Selection] Figure 2

Description

  The present invention relates to a chair suitable for a person to perform manual work.

  When a person performs a manual work at a certain place, the person often sits on a chair and works. The contents of manual work performed on a chair are various. For example, for office work using a desk, mouse operation and keyboard operation, assembly and inspection in a factory line, assembly, processing, and processing of a workpiece placed on a table, a person sleeping on a bed or a person sitting on a chair Assistance services (e.g. meal care, body massage and care), etc.

  When sitting on a chair and working manually, the arm is generally extended and the upper arm (second arm) is generally faced downward and the lower arm (front arm) is extended. In any case, at least the hand is at the free end, so there is a problem that the arm becomes tired.

  On the other hand, there are chairs with elbow pads in the past, but for example, the usual armrests of chairs such as office swivel chairs are mainly intended for resting the arm. It is not done to use a butt to assist in manual work.

  However, the idea of using an elbow rest for assisting manual work is not completely absent. For example, Patent Document 1 discloses that the tip of an ordinary elbow rest is assumed that the arm does not get tired during personal computer operation (keyboard operation / mouse operation). It is disclosed that an auxiliary pad on which a person's elbow (joint part) is mounted is attached to a part so as to be able to turn horizontally. Patent Document 2 discloses a chair that allows a seated person to operate a handle of a pachinko machine with one elbow. Is disclosed.

  Further, Patent Document 3 discloses a chair provided for convenience of keyboard operation by making it possible to use the backrest as an elbow rest (or wrist rest) by forming the backrest into a horizontally long bar shape. Has been. In addition, in the patent document 4, the applicant of the present application has proposed a chair provided with an auxiliary body that can be used for both a breastplate and a backrest.

Furthermore, Patent Document 5 discloses a health promotion chair provided with an abdominal pad and an elbow pad, and Patent Document 6 discloses a kind of posture correcting chair in which an elbow pad is integrally formed on the backrest. Has been. In addition, as a treatment chair, a chair provided with a breast pad and an elbow pad (Patent Document 7) and a chair provided with an elbow pad and a head pad (Patent Document 8) have been proposed.
JP-A-10-248673 JP-A-6-245847 Japanese Utility Model Publication No. 5-23958 JP 2005-21468 A Japanese Utility Model Publication No. 2002-125803 Japanese Patent Publication No. 3-42086 Japanese Patent Publication No. 6-69469 Japanese Utility Model Publication No. 62-14859

  When sitting on a chair, work is often carried (for example, tools and parts for assembly, inspection and processing, and tableware for meal assistance). When working with objects like this, not only does fatigue of the arm double, but it also induces obstacles such as fatigue, stiff shoulders and dullness, or the body becomes bent forward to cover the arm, Diseases such as back pain and gastrointestinal disorders are more likely to occur.

  Therefore, if the burden on the human body when working in a sitting state can be reduced, not only the health of the worker can be secured, but also the medical expenses can be suppressed and the work can be suppressed by preventing the illness / disability of the worker. It can be said that productivity can be improved by increasing the speed and decreasing the absenteeism rate.

  However, as described above, various chairs having an armrest function have been disclosed so far, but these are intended to reduce the physical burden on the user when working with objects. For this reason, even if it is used for manual work, it is difficult to say that the effect of reducing the burden on the user can be sufficiently exhibited. Stated differently, at present, as a chair for moving a hand while a person sits down, the arm and body are easy to move, the stability of the body and arm support, robustness, etc. It can be said that nothing was developed in a standing manner.

  The present invention has been made to improve the current situation.

  The chair according to the invention of claim 1 is provided with a seat on which a person can sit and a post arranged so that the person who is seated faces each other. A pair of left and right elbow supports (which may be called elbow pads) on which the elbows can be placed are provided separately from each other.

  A chair according to a second aspect of the present invention is the chair according to the first aspect, wherein the seat is supported by a leg device through a seat receiving base so as to be horizontally rotatable, while the support column can be swung horizontally with the seat. It is attached to a seat or a seat receiving base, and a branch frame branched right and left is integrally provided on the upper part of the column, and an elbow support is attached to the tip of the left and right branch frames so as to be horizontally rotatable. Furthermore, the user does not have a backrest that can be leaned on even when the elbow is placed on the elbow support, and a person can sit on the seat while sitting on the seat.

  Furthermore, the chair of the invention of claim 3 is the chair according to claim 2, wherein the elbow support has an elongated shape in a plan view, and the elbow support extends along a longitudinal direction on a support shaft provided at a tip of the branch frame. The left and right elbow supports are mounted in such a manner that they can slide in a horizontal direction and can rotate horizontally around a support shaft. It is attached to the branch frame so that it can be horizontally rotated to the left and right outside in the range up to the posture where it becomes a letter-shape.

  According to the present invention, since the person can work with the elbow on the elbow support, the weight of the arm and the weight of the object held in the hand will not be a burden on the upper body, The upper body will be supported. For this reason, the burden on the human body is remarkably reduced, and the burden on the body is reduced even when the work is performed with tools or parts (or assistance work such as lifting a part of the human body). It can be significantly reduced.

  And since the elbow support is separated into left and right, it is possible to move the chest largely in the front-rear direction and swing left and right with the elbow support on the left and right elbows. Easy to work with. In addition, the left and right elbow supports have high support strength because they are attached to the columns, and therefore, work that handles relatively heavy objects and work on the middle waist where the elbow support is heavy can be performed stably and safely. be able to.

  According to the second aspect of the present invention, the left and right elbow supports can be rotated horizontally, so that the arm can be freely opened and closed, and the operation becomes easier. Further, in claim 2, it is possible to support the left and right elbow supports with separate struts, but if the left and right elbow supports are supported by one strut as in claim 2, not only the structure becomes simple. The support column is located between the left and right feet of the user, so the support column does not interfere with the user.

  According to the third aspect of the present invention, since the elbow support is elongated, the lower armpit close to the wrist can be supported over a wide range from the elbow joint, so that the burden on the arm can be prevented from being concentrated on a specific part of the arm. In addition, there is an advantage that fine work can be easily performed because the posture of the arm is stable.

  Furthermore, in claim 3, since the elbow support is slidable and horizontally rotatable, the elbow support moves horizontally following changes in the position and posture of the arm. The posture can be changed very smoothly, so the wrist can be moved freely over a wide range of front and rear and left and right, and the usability can be greatly improved (for example, the upper body can be moved to the left or right You can easily twist the direction, stretch one arm forward, and pull the other arm forward.)

  By the way, when a person spreads the lower eyelid to the left and right outside with the arm bent in an L shape, there is a limit to the angle at which the arm can be spread horizontally due to the structure of the shoulder joint. When the elbow is placed on the elbow support, the arm is bent in an L shape, and if the lower arm is too widened by some kind of bounce, there is a possibility of causing a failure. In this regard, if configured as in claim 3, it is possible to prevent the elbow support from being excessively spread and deformed, and thus there is an advantage that the burden on the shoulder can be prevented or suppressed.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 7 show the first embodiment, and FIGS. 8 to 12 show the second embodiment. Hereinafter, the first embodiment will be described.

(1). Outline of First Embodiment FIG. 1A is a perspective view of a chair, FIG. 2B is a front view, and FIG. 2A is a rear perspective view of a used state. ) Is a plan view. First, an outline of the chair will be described based on these drawings.

  The chair includes a leg device 1, a seat receiving base 2, a seat 3, a support column 4, and left and right elbow supports 5 as main components. The seat support base 2 is fixed to the upper end of the leg device 1, the seat 3 and the support column 4 are attached to the seat support base 2, and the elbow support 5 is attached to the support column 4.

  The leg device 1 includes a leg strut (gas cylinder) 6 that can be adjusted in height, a plurality of (five) branch legs 7 extending radially therefrom, and a footrest ring secured to the upper surface of each branch leg 7 by welding. The caster 9 is attached to the tip of each branch foot 7. Although the detailed structure is omitted, the caster 9 is used so that when a person is seated, the caster 9 is locked (brake) and cannot be rotated. Therefore, it can prevent moving during work. The gas cylinder which is the leg column 6 has a lock release lever 10 incorporated in advance.

  The seat receiving base 2 is made of a metal plate (may be made of die-casting or resin) and is formed in a box shape opened upward, and the upper end of the leg support 6 is fitted to the seat receiving base 2. On the other hand, the seat 3 has a structure in which a cushion 12 is stretched on the upper surface of a wooden substrate 11 such as plywood, and the shape in plan view is similar to a bicycle saddle with a portion close to the support column 4 being a tapered portion 3a. It has a shape. The support column 4 is attached to the seat receiving base 2 via a support arm 13, and the support arm 13 is set so as to rotate downward by a slight angle against the spring.

  The tip of the support arm 13 is composed of a support cylinder 14 extending vertically, and the support column 4 is supported by the support cylinder 14 via a clamp body 15 so that the height can be adjusted. The clamp body 15 has a rotary handle 16. When the handle 16 is rotated in one direction, the support column 4 can be moved up and down to an arbitrary height, and when the handle 16 is rotated in the other direction, the clamp body 16 is moved. The column 4 is held by the support cylinder 14 so as not to be dropped. The clamp body 15 is an example of a height adjusting means for the support column 4. It is also possible to use a gas cylinder as the support column 4.

  The column 4 is made of a metal round pipe (steel pipe or aluminum pipe), and left and right branch frames 17 are fixed to the upper end thereof by welding. The branch frame 17 has an elliptical shape or an oblong shoulder shape, and is inclined at a gentle angle so that its height increases toward the tip. The elbow support 5 has a substantially rectangular elongated shape in a plan view, is slidable in the longitudinal direction thereof, and can be horizontally rotated at any slid position.

  2B shows a reference posture in which the left and right elbow supports 5 are arranged in the same straight line in a plan view, and the right elbow support 5 can be rotated from the reference posture clockwise by a predetermined angle, The left elbow support 5 can be rotated by a predetermined angle counterclockwise from the reference posture. FIG. 2A shows a state in which the left and right elbow supports 5 are arranged in a C shape in plan view, and in general, it can be said that the work is often performed in this posture. Details of each part will be described below.

(2). Support structure of the seat 3 support arm First, the support structure of the seat and the support arm 13 will be described with reference to FIG. 3A is a cross-sectional view taken along the line III-III of only the seat 3 in FIG. 2B, and FIG. 3B is a cross-sectional view taken along the line III-III in FIG. It is. Reference numeral 20 denotes a cloth (skin material) that covers the cushion 12. An upper end portion of the leg support 6 constituting the leg device 1 is fixed to the seat receiving base 2. The seat receiving base 2 is fixed to the substrate 11 of the seat 3 with screws (not shown).

  Further, as shown in FIG. 3B, the support arm 13 is fixed to a hook-shaped (U-shaped) receiving member 21 that opens upward, and the base end portion of the receiving member 21 is the seat receiving base 2. It is connected to a bearing bracket 20 disposed inside by a pin 20 '. Further, a spring receiver 22 projects downward from a portion of the seat support base 2 that is shifted from the leg column 6 to the column 4 side, and a support arm 13 is supported by a spring 23 housed in the spring receiver 22 ( A soft elastic body such as rubber can be used instead of the spring 23). The support arm 13 can tilt backward within a range of a notch groove 24 formed in the rear end edge of the seat receiving base 2.

  The left and right side surfaces of the tapered portion 3a in the seat 3 are concave surfaces 3b that are recessed outward in a plan view, and the person who is seated positions the thigh at the location of the concave surface 3b. And in this embodiment, the part except the taper part 3a among the peripheral parts of the cushion 12 of the seat 3 comprises the bank part 12a with high height. For this reason, the seated person can firmly attach the elbow to the elbow support 5 in a state where the buttocks are supported so as not to be able to shift backward. The height of the portions near the left and right ends of the bank portion 12a gradually decreases toward the ends.

  As a means for preventing the buttocks from shifting backward in the seated state, for example, as disclosed in Patent Document 8, the rear portion of the upper surface of the chair (cushion) may be inclined backward in a side view. In this case, it may be difficult to work because the upper body is leaning forward. On the other hand, in the present embodiment, the seating surface of the seat 3 is kept horizontal, and the backward displacement of the body is prevented by the bank portion 12a, so that the elbow support 5 is attached to the elbow support 5 even when the upper body is raised, for example. You can stretch your elbows firmly.

  Of course, depending on the work content, there are cases where it is better to tilt the upper body forward or a person who prefers a forward tilted posture, but in this embodiment, the human thigh is a concavity 3b portion of the tapered portion 3a. Therefore, the upper body can be tilted forward without feeling a sense of pushing up the thigh (that is, a free posture can be taken). It is also possible to employ a mechanism that tilts the seat 3 forward or steplessly.

  In the use state shown in FIG. 2 (A), the user positions both feet on the left and right sides of the support column 4, but can also sit and work with the left and right feet placed on one side of the support column 4. is there. This is a kind of choi and a person twists his / her body and attaches both elbows to the elbow support 5. However, if the seating time is short and people get on and off the chair frequently, use it like this. There may be an aspect (in this case, it is preferable to attach the seat 3 to the seat receiving base 2 so as to be horizontally rotatable as in the second embodiment). Further, as a use mode in a relaxed state, it is possible to place both elbows or one elbow on the elbow support 5 with the support column 4 as the back.

(3). Mounting structure of elbow support Next, the mounting structure of the elbow support 5 will be described mainly with reference to FIGS. 4 is a partial front view drawn with the left elbow support 5 as the center, FIG. 5 is a sectional view taken along the line VV in FIGS. 4 and 7A, and FIG. 7A is a plan view, FIG. 7A is a sectional view taken along the line VII-VII in FIG. 5, and FIG. 7B is a sectional view taken along the line B-B in FIG.

  For example, as shown in FIG. 7A, a cylindrical body 25 opened vertically is fixed to the end of the branch frame 17 by welding, and a rectangular box-shaped rail bracket 26 is attached to the cylindrical body 25 as a base bracket. 27 is attached to be horizontally rotatable. The rail bracket 26 is made of a metal plate and has a front end and a rear end in the longitudinal direction, and resin caps 28 are attached to both ends.

  On the other hand, the base bracket 27 has an L-shaped cross section having a back plate 27a and a side plate 27b one by one, and a horizontal upper plate 27c and a lower plate 27d are integrally formed on the back plate 27a. The side plate 27b is formed in a trapezoidal shape in which the lateral width increases as it goes upward, and the overhanging dimension of the upper plate 27c is larger than the overhanging dimension of the lower plate 27d (of course, in other forms) good.).

  The rail bracket 26 and the base bracket 27 are integrated by welding so as to overlap each other vertically, and are rotatably connected to the cylindrical body 25 by bolts 28 and nuts 29. The bolt 28 penetrates the lower surface plate 26 a of the rail bracket 26 and the upper and lower plates 27 c and 27 d of the base bracket 27, and the upper surface plate 26 b of the rail bracket 26 has a watermark hole 31 for passing the head of the bolt 29. Vacant. As shown in FIG. 4, a protective cap 32 is attached to the nut 30, but if a cap nut is used, the cap 32 becomes unnecessary.

  A flanged metal bush 25a into which the bolt 29 is fitted is fitted into the cylindrical body 25. The metal bush 25a has a metal body and a surface coated with a resin layer, and the presence of the resin layer can prevent metal sound from being generated when the elbow support 5 is rotated. In addition, if the entire bush is made of resin, it is necessary to increase the dimensions of the flange and the like to some extent to ensure strength. However, since the metal bush 25a of the present embodiment is made of metal, the thickness of the flange There is an advantage that strength can be secured even if the thickness is reduced.

  The rail bracket 26 is connected to the cylindrical body 25 at a portion near the one end along the longitudinal direction thereof, and a flat surface is provided between the open hole 31 and the other end surface of the upper surface plate 26b of the rail bracket 26. A long and narrow guide hole 33 is formed so as to extend along the longitudinal center line. It is also possible to arrange the nut 30 inside the rail bracket 26 and screw the bolt 29 into the rail bracket 26 from below. Needless to say, another connecting member (for example, a pin with a snap ring) may be employed instead of the bolt 29.

  The elbow support 5 has a structure in which a cushion 35 is stretched on the upper surface of a resin base material 34, and the upper surface is loosely recessed in a state of opening upward in a cross sectional view (the cushion 35 is insert-molded on the base material). It can be glued or fitted). The base member 34 is formed with a pair of holding portions 34a that are in close contact with the longitudinal side surface of the rail bracket 26 so as to extend in the longitudinal direction. At the lower end of the holding portion 35a, a flange portion 35b that is held so as not to be able to be pulled out is integrally formed, so that the elbow support 5 can slide along its longitudinal direction. Further, a stopper projection 36 that fits into the guide hole 33 of the rail bracket 26 is provided on the bottom surface of the base material 34.

  The stopper projection 36 is formed at the tip of an elongated beam-shaped portion 38 formed by providing a U-shaped slit 37 on the bottom surface portion of the base material 34, and the beam shape is the lower end of the stopper projection 35. An inclined surface 35 a is formed on the side opposite to the base of the portion 38. For this reason, the stopper projection 35 can be fitted into the guide hole 33 of the rail bracket 26 using the fact that the beam-like portion 38 is bent upward and deformed. Therefore, the elbow support 5 is attached to the rail bracket 26 by a one-touch operation in which the elbow support 5 is pushed in a state of being overlapped with the rail bracket 26.

  In addition, an auxiliary hole 39 that overlaps the end portion of the guide hole 33 in a plan view is vacated in a portion of the lower surface plate 26a of the rail bracket 26 opposite to the cylinder 25. Then, by pushing up the stopper projection 36 from the auxiliary hole 39 with a screwdriver or the like, the stopper projection 36 can be removed from the guide hole 33 and the elbow support 5 can be removed from the rail bracket 26. The stopper projection 35 is an example of a stroke restricting means, and the stroke by which the elbow support 5 slides in the longitudinal direction by the stopper projection 36 is described.

  The stopper protrusion 36 can be configured separately from the base material 34. For example, it is possible to use screws as stopper protrusions and screw them into the bottom surface of the base material 34 through the auxiliary holes 39 to fix them. It is also possible to form a long groove on the bottom surface of the base material 34 and fit a protrusion (for example, a screw) into the long groove on the rail bracket 26.

(4) Summary As described above, the elbow support 5 is slidable along its longitudinal direction and can be horizontally rotated around the cylinder 25, so that the user can adjust the position and posture of the left and right arms. It can be changed freely. In other words, when the position or posture of the arm is changed according to the intention of the person, the elbow support 5 moves following the arm.

  For this reason, various operations can be easily performed by moving the arm while the elbow is placed on the elbow support 5. If only the left and right elbow supports 5 are provided on the support column 4 as in this embodiment, the field of view of the user is widened so that the work can be easily performed, and the upper body can be moved forward greatly. You can easily take a far away object.

  In addition, since the elbow support 5 is elongated, the lower arm can be supported by the elbow support 5 over a wide range while ensuring freedom of the arm, so that it is possible to remarkably reduce the burden on the arm when a person works.

  The elbow support 5 of the present embodiment can not be rotated around. As can be understood from FIG. 5, when the left branch frame 17 is taken as an example, the side plate 27 b of the base bracket 27 hits the back surface of the branch frame 17. The clockwise rotation is restricted, and the elbow support 5 cannot be rotated clockwise from the reference posture extending substantially parallel to the branch frame 17 in plan view. On the other hand, when the back plate 27a of the base bracket 27 hits the front surface of the branch frame 17, rotation in the counterclockwise direction is restricted. That is, the left and right elbow supports 5 can be rotated outward only up to a reverse C-shaped posture in plan view.

  As described above, there is a limit to the posture in which a normal person can turn his arm horizontally with his elbows bent, and he can only turn about 100 degrees. The elbow support 5 according to the present embodiment conforms to the movable range of the human arm, and therefore, the elbow support 5 does not rotate outwardly due to some kind of bounce and hurts the elbow. It can be said that the range in which the elbow support 5 can be rotated horizontally is preferably about 90 to 110 ° from the reference state.

  For example, when care is taken by approaching a person sleeping on a bed, if the elbow support 5 is in a forward-facing posture, the caregiver is difficult to bring the body (face) close to the cared person, but in this embodiment (and the second embodiment) By placing the support 5 in the sideways posture, the caregiver can largely bend the elbow left and right and bend forward to bring the face closer to the cared person. For this reason, it can contribute to the improvement of communication between the caregiver and the care recipient. In addition, when the elbow support 5 is facing forward and backward, the elbow support 5 may approach the cared person's face, which may cause anxiety to the cared person. There is also an advantage that the caregiver's anxiety can be eliminated.

  When the elbow support 5 is in a horizontally long posture substantially parallel to the branch frame 17, the elbow is often placed on the left and right intermediate portions of the elbow support 5, and in this case, depending on the work contents, the elbow support 5 is supported by the elbow. In this embodiment, the side plate 27b of the base bracket 27 hits the branch frame 17 to prevent the elbow support 5 from rotating. You can apply your strength to your arms with confidence. This is also an advantage of this embodiment.

  As shown in FIG. 2C, the cylindrical body 25 of the branch frame 17 is positioned slightly inside the line connecting the adjacent casters 9. For this reason, the load applied to the elbow support 5 is always supported in the region inside the line connecting the adjacent casters 9, and as a result, the chair falls over even if a large downward load is applied to the elbow support 5. Such a problem does not occur.

  In addition, when the form which embraces the rail bracket 26 with the base material 34 of the elbow support 5 is employ | adopted as a slide permission means of the elbow support 5 like this embodiment, the width dimension in which the base material 34 and the rail bracket 26 fit, Since the length dimension can be increased, the elbow support 5 has an advantage of ensuring high stability while ensuring a large slide stroke (support strength for the elbow support 5 can be improved). In addition, it is preferable to employ a configuration in which the support column 4 can be tilted backward at a slight angle, since the locking function for the upper body is exhibited and the burden on the body can be reduced. The rail bracket 26 and the base bracket 27 can be manufactured as a single unit.

  By the way, when the user is generally a man, there is no resistance to sitting on the seat 3, but when the user is a woman, there is psychological resistance to sitting on the seat 3 or wearing a skirt. In some cases, it is difficult to sit down. Further, regardless of whether it is male or female, there are cases where it is difficult to straddle the seat 3 due to obstacles such as difficulty in opening the legs.

  In this regard, as shown by the one-dot chain line in FIG. 1 (A), when the part below the upper surface of the thigh of the person sitting on the column 4 is brought close to the elbow support 5 on one side (right side), the person There is an advantage that the elbow support 5 can be used while sitting in a state in which these are aligned (this point can also be applied to the second embodiment).

(5). Second Embodiment Next, a second embodiment shown in FIGS. 8 to 12 will be described. 8A is a perspective view, FIG. 8B is a front view, FIG. 9A is an overall plan view, and FIG. 8B is a portion with the left and right elbow supports 5 aligned on the same line. FIG. 10 is a side view, FIG. 11A is a rear view, FIG. 10B is a sectional view taken along the line BB in FIG. 11A, and FIG. 10C is a sectional view taken along the line CC in FIG. FIGS. 12D and 12E are views showing a modification, FIG. 12A is a plan view of a breast pad 41, and FIG. 12B is a sectional view taken along line BB of FIG.

  The second embodiment is basically the same as the first embodiment. As a major difference, the leg device 1 is provided with the footrest ring 8 in the first embodiment, but is not provided in the second embodiment. In the first embodiment, the seat 3 is fixed to the seat base 2. However, in the second embodiment, the seat 3 is rotatably attached to the seat base 2. In the first embodiment, the support 4 is supported. Although only the elbow support 5 is attached to the body, there are three points in the second embodiment: a breast pad (or abdomen pad) 41 is also attached to the support 4. Hereinafter, the second embodiment will be described mainly focusing on differences from the first embodiment. The same components as those in the first embodiment are denoted by the same reference numerals.

  The leg device 1 is basically the same as in the first embodiment, and each caster 9 uses a brake (lock) that is applied when a downward load is applied, as in the first embodiment. A lever 10 for releasing the lock of the gas cylinder which is the leg support 6 is provided on the seat receiving base 2. The seat 3 has the same planar shape and structure as the first embodiment. In the present embodiment, the seat 3 is attached to the seat base 2 via a bearing member 9 so as to be horizontally rotatable, but the bearing member 42 is a support arm sandwiching the axis of the leg column 6 of the seat base 2. 13 is arranged at a position shifted to the opposite side.

  In the present embodiment, the seat 3 can be used in both the posture in which the tapered portion 3a is brought close to the support column 4 and the posture in which the tapered portion 3a is positioned on the side opposite to the support column 4. In the latter posture, the person sits facing the opposite side of the breast pad 41 (in this case, the breast pad 41 functions as a backrest). The seat 3 can be formed as a single structure having only the substrate 11, and this is the same as in the first embodiment.

  The support arm 13 is fixed to the seat receiving base 2. The support column 4 is supported by the support cylinder 14 of the support arm 13 through the lower clamp body 43 so that the height can be adjusted. A receiving cylinder 45 is fitted to the support column 4 via an upper clamp body 44 so that the height can be adjusted, and the elbow support 5 is attached to the left and right branch frames 17 fixed to the receiving cylinder 45. Therefore, in this embodiment, the branch frame 17 is attached to the support column 4 via the receiving tube 45.

  The upper and lower clamp bodies 43 and 44 (which may be referred to as stoppers) have the same structure, and as shown in FIG. 11C, a non-annular clamping body 46 that holds the support column 4 is provided. By changing the width of the tip of 46 with a handle 47 with bolts, it is possible to change between a locked state in which the column 4 cannot be dropped and a free state in which it can freely move up and down. In the present embodiment, the height of the breast pad 41 and the elbow support 5 can be adjusted individually.

  As shown in FIG. 12, a downward convex portion 48 extending in the longitudinal direction is integrally formed on the lower surface of the base material 34 constituting the armrest 5, and an upward long groove 49 and a downward opening are formed in the convex portion 48. The lower long groove 50 is formed to extend in the longitudinal direction of the base material 34, and a reinforcing plate 51 is fitted into the lower long groove 50. A long hole 52 extending in the longitudinal direction of the upper and lower long grooves 49 and 50 is formed in a portion between the upper and lower long grooves 49 and 50 and the reinforcing plate 51.

  On the other hand, the distal end portion of the branch frame 17 is bent in a vertical posture, and a bush 53 is fixed to the distal end of the branch frame 17 so as not to rotate. The bush 53 is provided with a convex portion 48 of the base member 34 in the elbow support 5. A flange 54 that overlaps from below is integrally formed (the bush 53 and the flange 54 may be separated). Further, a bolt 56 with a flange is screwed into the bush 53 through a collar 55 fitted in the base material 34 of the elbow support 5 and the elongated hole 52 of the reinforcing plate 51.

  In a state where the bolt 56 is screwed firmly, a slight gap is set between the flange 56a of the bolt 56 and the bottom surface of the upper long groove 49 in the base member 34. Can be slid horizontally and can be freely rotated horizontally around the bolt 56 to take an arbitrary posture.

  The breast pad 41 is vertically long and has an upper portion and a lower portion formed in an arc shape when viewed from the front, has an oval shape as a whole, and is attached to the upper end of the column 4. The breast pad 41 is in a slightly tilted posture in a side view. Further, the breast pad 41 is set to have a horizontal width that can be hit by a general adult's breast. That is, the dimensions are such that the base of the arm does not hit, and specifically, it may be about 15 to 20 cm. The vertical length of the breast pad 41 is set to a size that straddles the chest and abdomen of a general adult. Specifically, it can be said that it may be about 25 to 35 cm.

  As shown in FIG. 11B, the breastplate 41 has a structure in which a cushion 59 is stretched on an inner shell 58 made of resin or the like (a cross is also stretched), and a support plate 60 such as a plywood is placed on the inner shell 56. Is fixed, and the support plate 60 is fixed to the upper end of the column 4 through a flanged joint 61.

  The breast pad 41 can also be attached to the column 4 in a state where the angle in the side view can be freely changed. An example of this structure is shown as a modified example in FIGS. That is, (D) is a vertical side view, and (E) is a plan view. In this example, the joint 61 is formed of an oval pipe material and arranged in an up-and-down longitudinal posture, and a breast pad is placed on the wide side plate of the joint 61. A bearing portion 61 a projecting to the opposite side of 41 is formed, and this bearing portion 61 a is connected to the support column 4 by a horizontal pin 62, whereby the side view posture of the breast pad 41 can be changed.

  In the case of this modification, a stopper portion 4a that enters the inside of the joint 61 is provided at the upper end of the support column 4 by bending or welding, and when the breast pad 41 is in a vertical posture in a side view, the upper inner surface of the joint 61 is on the upper surface of the stopper portion 4a. On the other hand, when the breast pad 41 is tilted rearward, the lower inner surface of the joint 61 is set so as to contact the lower surface of the distal end part of the stopper part 4a, thereby restricting the tilting range of the breast pad 41. Of course, the configuration that allows the breastplate 41 to tilt and the configuration that regulates the tilting range can be variously embodied.

  When the breast pad 41 is provided as in the present embodiment, the breast pad 41 can be detachable from the support column 4. For example, by fixing the breast pad 41 to a rod or pipe rod and making the rod freely detachable from the pipe support 4 from above, the mode with the breast pad 41 and the mode without the breast pad 41 can be freely set. It is possible to select.

  In addition, a configuration in which the breastplate 41 is eliminated from the second embodiment can also be adopted (in this case, the receiving tube 45 may be eliminated and the branch frame 17 may be fixed to the upper end of the support column 4, for example, in FIG. You may align the upper end of the support | pillar 4 with the upper end of the cylinder 45).

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, the elbow support and the planar shape of the seat are not limited to those shown in the drawings. For example, the elbow support and the seat may be formed in a circular shape or an elliptical shape in plan view. When providing a breast pad (or abdomen pad), the shape can also be set arbitrarily. The method of causing the elbow support to follow the movement of the person's arm is not limited to using the combination of the slide of the elbow support and the horizontal rotation as in the embodiment, and, for example, two links that rotate horizontally are used. It is also possible.

  The support may not be pipe-shaped or rod-shaped, and any form such as a channel shape (saddle shape) can be employed. In short, it is only necessary to support the elbow support directly or via another member. The chair can be fixed.

BRIEF DESCRIPTION OF THE DRAWINGS It is a general view of 1st Embodiment, (A) is a perspective view of a chair, (B) is a front view. (A) is a back perspective view of a use state, (B) (C) is a top view. FIG. 3A is a sectional view taken along the line III-III of only the seat 3 in FIG. 2B, and FIG. 3B is a sectional view taken along the line III-III in FIG. It is a partial front view of a chair. FIG. 5 is a cross-sectional view taken along line VV in FIGS. 4 and 7A. (A) is the isolation | separation perspective view which shows the structure of attachment of an elbow support, (B) is a top view. 5A is a sectional view taken along the line VII-VII in FIG. 5 and FIG. 5B is a sectional view taken along the line BB in FIG. It is a figure which shows the external appearance of 2nd Embodiment, (A) is a perspective view, (B) is a front view. (A) is the whole top view, (B) is a partial top view in the state which aligned the left and right elbow support in the same line shape. It is a side view of a chair. (A) is a rear view, (B) is a cross-sectional view taken along the line BB of (A), (C) is a cross-sectional view taken along the line CC of (A), and (D) and (E) are views showing modifications. is there. (A) is a top view of an elbow support, (B) is BB view sectional drawing of (A).

Explanation of symbols

1 leg device 2 seat receiving base 3 seat 4 strut 5 elbow support 6 leg strut (gas cylinder)
13 Support Arm 17 Branch Frame 26 Rail Bracket 27 Base Bracket 41 Chest

Claims (3)

A pair of left and right elbow supports that can be seated by a person and a support that is placed so that the person who is seated faces each other. Are separated from each other,
Chair. The seat is supported by a leg device through a seat receiving base so as to be horizontally rotatable, while the support column is attached to the seat or the seat receiving base so as to be able to rotate horizontally integrally with the seat. A branch frame that branches to the left and right is integrally provided at the top, and an elbow support is attached to the tip of each of the left and right branch frames so that it can rotate horizontally, and the user places the elbow on the elbow support. However, there is no backrest that can be leaned on, so that people can sit on the seat,
The chair according to claim 1. The elbow support has an elongated shape in a plan view, and the elbow support is slidable in a direction along the longitudinal direction on a support shaft provided at the end of the branch frame and horizontally rotates around the support shaft. Furthermore, the left and right elbow supports are horizontally rotated to the left and right outside in a range from a straight lined posture to a posture that extends substantially in parallel in a plan view or a posture that becomes a reverse C shape. Installed on the branch frame, as you can
The chair according to claim 2.

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