JP2004024702A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simplify the structure and improve the operability of a chair with a seat board whose position can be adjusted forward/backward. <P>SOLUTION: The synthetic resin seat board 38 has an easily deformable part 38a surrounded by a U-shaped slit 54 which opens backward from the plane view. A pair of left and right engagement brackets 50 are formed in the easily deformable part 38a, and downward engagement recesses 49 are intermittently formed in the front/rear directions in the engagement brackets 50. Pins 48, with which the engagement recesses 49 are engaged, are mounted on a base. Because of the presence of the slit 54, the engagement brackets 50 can be raised up with light force, and therefore, the position of the seat board 38 can be adjusted forward/backward with light force as well. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a chair capable of adjusting a front and rear position of a seat plate.
[0002]
[Prior art]
Adjusting the front and rear position of the seat is most popular in automobile seats, but even in office chairs such as swivel chairs, the front and rear position of the seat can be adjusted according to the user's physique and working conditions. It has been proposed to be able to adjust.
[0003]
As an example, Japanese Patent Application Laid-Open No. 2002-119353 discloses that a stepped guide portion having a concave-convex shape in a side view in which a concave portion having an upward opening is intermittently formed in a left and right side plate of a base fixed to an upper end of a leg. The seat plate is provided with a pin that fits into the recess of the stepped guide portion, and when the seat plate is lifted as a whole, the pin is separated from the recess of the stepped guide portion and can be moved back and forth. Chairs are listed.
[0004]
[Problems to be solved by the invention]
The above-mentioned publication is what integrates the guide means of the seat plate and the front-back position adjusting means, so to speak, but has an advantage that the structure can be simplified, but for example, when carrying the chair, the user lifts the seat plate by lifting his hand. Therefore, there is a possibility that the front and rear positions of the seat plate may be changed although not intended.
[0005]
In addition, when the seat plate is entirely lifted, there is a possibility that the seat plate is more likely to rattle.
[0006]
An object of the present invention is to improve such a situation.
[0007]
[Means for Solving the Problems]
The chair according to the present invention includes a seat and a seat receiving portion that supports the seat so as to be slidable back and forth.The seat is provided with upper engaging means, and the seat receiving portion is provided with lower engaging means. By changing the engagement position of the vertical engagement means, the front-back position of the seat can be adjusted stepwise.
[0008]
According to the first aspect of the present invention, the upper engaging means is provided on the seat plate so that the upper engaging means can move away from the lower engaging means against the elasticity in a direction of disengaging from the lower engaging means, and a person can manually lift the upper engaging means. By moving the engaging means in a direction away from the lower engaging means, or by forcibly moving the upper engaging means away from the lower engaging means by pushing and pulling the seat plate back and forth, The front and rear position of can be adjusted.
[0009]
According to a second aspect of the present invention, the chair according to the first aspect of the present invention includes a base provided on the upper end of the leg, an intermediate support disposed above the base, and an intermediate support disposed above the intermediate support. A seat, a back support frame provided on the intermediate support so as to be tiltable rearward, a backrest attached to the back support frame, and a spring means for elastically supporting the rear tilt of the back support frame; The seat receiving portion is constituted by the support and the intermediate support is configured to at least retreat in conjunction with the backward tilt of the backrest.
[0010]
The seat is slidably mounted on the intermediate support so as to be slidable back and forth. An upper engaging means having a downwardly concave or protruding engaging portion continuous in the front and rear direction is moved upwardly against the elasticity. On the other hand, the base is provided with a lower engaging means which engages with the upper engaging means from below so as to be able to retreat more than the intermediate support in conjunction with the backward tilt of the backrest. Provided.
[0011]
According to a third aspect of the present invention, in the second aspect, the seat comprises a seat plate made of a synthetic resin and a cushion stretched on an upper surface of the seat plate, and a person of the seat plate can reach a fingertip from a near side. The upper engaging means is integrally formed with a downwardly engaging recess in the front and rear direction and has a U-shaped slit which surrounds the upper engaging means and is formed in a rearward opening in a plan view. The portion provided with the engagement means constitutes an easily deformable portion that can be easily raised and deformed upward around the rear portion.
[0012]
On the other hand, the base is provided with lower engaging means provided with a pin that fits into the engaging recess of the upper engaging means from below, and the engaging recess of the upper engaging means with respect to the pin of the lower engaging means. The front-back position of the seat is adjusted by changing the fitting position of the seat.
[0013]
[Action and Effect of the Invention]
In the present invention, since the upper and lower engaging means are provided separately from the front and rear movement guide means of the seat plate, the front and rear positions of the seat plate can be easily changed even if the upward force is applied by putting a hand on the seat plate. In addition, the backlash of the seat plate can be reduced.
[0014]
Since the upper engaging means provided on the seat plate is disengaged from the lower engaging means by utilizing the movement against the elasticity, it is possible to adjust the forward and backward movement of the seat plate while having a simple structure. It can be done easily.
[0015]
By the way, in a synchro-type chair in which the seat plate tilts backward at least in conjunction with the backward tilt of the backrest, the comfort state during locking can be improved, and the so-called shirt-turning phenomenon due to the separation between the seat plate and the backrest during locking. Can be suppressed.
[0016]
According to the second aspect of the present invention, in the synchro-type chair, the amount of retraction of the seat plate can be increased to prevent the shirt from being turned up. However, in this case, the lower engaging means can adjust the front and rear position of the seat plate. Since the means also serves as the means for retracting the seat plate at the time of locking, it is possible to suppress the complication of the structure even though the chair has the function of preventing the shirt from turning over and the function of adjusting the front and rear positions of the seat plate.
[0017]
As the upper engaging means, it is also possible to constitute it separately from the seat plate and attach it to the seat plate. However, when constituted as in claim 3, the upper engaging means is integrally formed with the seat plate. Therefore, the structure is simplified, and the labor of assembling and managing members can be reduced. In addition, since the portion where the upper engaging means is provided is surrounded by a slit to form an easily deformable portion, the ease of front-rear movement adjustment of the seat is not impaired.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described with reference to the drawings.
[0019]
(1). First Embodiment (FIGS. 1 to 13)
▲ 1 ▼. 1 to 13 show a first embodiment (main embodiment). 1 is a front view of the chair, FIG. 2 is a right side view, and FIG. 3 is a rear view.
[0020]
As shown in these figures, the chair includes a leg 2 having a caster and a leg support (gas cylinder) 1, a base 3 fixed to the upper end of the leg support 2, and an intermediate support 4 disposed above the base 3. A seat 5 supported by the intermediate support 4, a back support frame 6 attached to the base 3 so as to be tiltable rearward, a backrest 7 attached to the back support frame 6, a headrest device 8 attached to the backrest 7, and a seat. 5 and armrest devices 9 arranged on both the left and right sides.
[0021]
The backrest 7 includes a backrest plate (back inner member) 10 made of a synthetic resin, a cushion 11 stacked on the front surface thereof, and a back cover (back outer member) 12 arranged behind the backrest plate 10 with a space therebetween. ing.
[0022]
Although not described in detail, a lumbar support mechanism is provided between the backrest plate 10 and the back cover 12 to push out a portion of the backrest plate 10 that mainly hits the waist of a seated person. The lumbar support mechanism includes a handle 14 extending so as to surround the back cover 12, and by operating the handle 14, it is possible to adjust the amount of forward projection of the backrest plate 10 and the position of the push-back height.
[0023]
The armrest device 9 includes an elbow support 15, an elevating cylinder 16 fitted to the elbow support so as to be adjustable in height and rotatable, and an armrest 17 mounted on the upper end of the elevating cylinder 16 so as to be vertically rotatable.
[0024]
▲ 2 ▼. Outline of Locking Mechanism Next, details of a portion relating to the present invention, such as a locking mechanism and a seat support mechanism, will be described with reference to FIGS. First, the locking mechanism will be described with reference to FIGS.
[0025]
4 is a side view of the central longitudinal section, FIG. 5 is a partial right side cross section cut at a side portion of the base 3, FIG. 6 is a right side view of a separated state, and FIGS. 7 to 10 are perspective views of members. It is.
[0026]
For example, as shown in FIGS. 7 to 9, the base 3 is formed in a case shape opened upward, and the leg support 1 is fitted to a position near the rear. In addition, a long hole 20 is formed in the front part of the left and right side plates of the base 3 and is inclined in the front-rear direction and rearwardly inclined in a side view. A first shaft (slide shaft) 21 penetrates through a bush 22. .
[0027]
A second shaft 23 penetrates a substantially middle portion between the front and rear of the base 3, and the front end of the back support frame 6 is connected to the base 3 with the second shaft 23. The second shaft 23 is held by the back support frame 6 with screws (not shown) so that it cannot be removed.
[0028]
The back support frame 6 is formed in a substantially L-shape in a side view, and in the present embodiment, a die-cast product of a light alloy such as aluminum (or another metal such as iron) is used. Upward projections 24 are formed in the front and rear halfway portions of the left and right back support frames 6, and the left and right projections 24 are connected by a third shaft 25.
[0029]
A pair of right and left kick springs (torsion coil springs) 26 are fitted to the second shaft 23 via spring supports 27 as an example of spring means. The forward end of the kick spring 26 is supported from above by a receiving member 28, and the other end extending rearward of the kick spring 26 extends below the third shaft 25.
[0030]
As shown in FIG. 4, the spring receiver 27 is formed with a load receiving portion 27 a extending substantially forward in a substantially U-shape in a side view. Although not described in detail, a forward end of the kick spring 26 is supported from above by a load receiving portion 27 a of a spring receiver 27.
[0031]
A bolt receiver 29 is non-rotatably fitted in the load receiving portion 27a of the spring receiver 27, and an adjusting bolt 30 is non-rotatably fitted in the bolt receiver 29 from above. The adjustment bolt 30 penetrates the base 3, and a knob 31 is screwed into the base 3 from below.
[0032]
The intermediate support 4 is made of a synthetic resin, has a plate shape as a whole, and is formed in an upwardly concave shape when viewed from the front. To be more precise, the intermediate support 4 has a horizontally intermediate portion at the left and right sides, and a wing portion inclined upward and outward on both left and right sides, and is formed in a wing shape as a whole. . The intermediate support 4 is formed with a large number of ribs extending in the front-rear direction and the left-right direction mainly for reinforcement.
[0033]
A pair of left and right bearings 33, 34 located on the left and right outer sides of the base 3 project downward from the front part and the rear part of the intermediate support 4, and the front bearing part 33 is connected to the first shaft 21. It is connected to the base 3. The third shaft 25 passes through the rear bearing portion 34.
[0034]
Therefore, the back support frame 6 is tilted backward against the elasticity of the kick spring 26, and the intermediate support 4 and the seat 5 are retracted while being tilted backward in conjunction with the backward tilt of the back support frame 11 (that is, The seat 5 synchronizes with the backrest 7). The rear end of the intermediate support 4 is provided with a rear cover 36 extending along the rear surface of the base 3.
[0035]
(3). Structure of Intermediate Support and Seat Next, the intermediate support 4 and the seat 5 will be described with reference to FIGS. 11 and 12 in addition to the previous drawings. FIG. 11 is a plan view of a seat plate and a lower cover, and FIG. 12 is a bottom view of a main part of the seat plate.
[0036]
For example, as shown in FIGS. 7 to 10, male rails 37 extending in the front-rear direction are formed on the left and right side edges of the intermediate support 4. On the other hand, as shown in FIG. 4, the seat 5 is composed of a seat plate (seat inner member) 38 made of a synthetic resin such as polypropylene and a cushion 39 stretched on the upper surface thereof, as shown in FIG. As described above, on the left and right sides of the seat plate 48, the female rails 40 are formed so as to be slidably fitted to the male rails 37 of the intermediate support 4 from the outside.
[0037]
A large number of slit groups 41 having different directions and lengths are formed in the seat plate 38 in order to facilitate the bending deformation. In this case, by increasing the density of the slit group 41 in a portion where the body pressure of the seated person acts more strongly, the fit to the buttocks of the person is enhanced.
[0038]
As shown in FIG. 4, a single reinforcing plate 42 extending between the left and right male rails 37 is superposed on the rear upper surface of the intermediate support 4 and is fixed with screws.
[0039]
▲ 4 ▼. The relative movement mechanism between the seat and the intermediate support and the front / rear position adjustment mechanism of the seat plate The seat 5 is set to retreat with a larger dimension than the intermediate support 4. This will be described with reference to FIGS.
[0040]
As shown in FIGS. 4 and 8, an L-shaped (bell-crank) side-view link member (lever member) 44 that also serves as a lower engagement means rotates in the left and right middle part of the first shaft 21. It fits freely.
[0041]
A guide shaft 45 projecting outward in the left and right directions is formed integrally with a lower portion of the link body 44. The guide shaft 45 is provided on a side surface of a left and right lower locking body 46 provided integrally with the base 3 or separately. It is slidably fitted in the formed guide groove 47 which is inclined rearward in side view. Accordingly, when the seated person leans on the backrest 7 and the first shaft 21 retreats, the link body 44 rotates so that the upper end thereof moves backward.
[0042]
At the upper end of the link body 44, a left and right longitudinal drive pin 48 penetrates so as to protrude to the left and right outer sides, while the front lower surface of the seat plate 38 is provided with the drive pin 48 as an example of upper engagement means. An engagement bracket 50 having a plurality of (three) engagement recesses 49 into which the left and right end portions of the bracket are fitted is integrally formed.
[0043]
Therefore, when the backrest 7 is tilted backward and the first shaft 21 is retracted, the link body 44 is rotated, and the seat 5 is retracted with a larger dimension than the intermediate support 4. The portion between the adjacent engaging recesses 49 has an arc shape in a side view.
[0044]
The link body 44 extends upward from the escape hole 51 provided in the intermediate support body 4, so that the link body 44 can be rotated while allowing the intermediate support body 4 to move back and forth. Instead of providing the drive pins 48, a pin portion may be integrally provided at the upper end of the link body 44.
[0045]
For example, as can be clearly understood from FIG. 10, a side stopper 53 for preventing the drive pin 48 from coming off is provided integrally with the lower surface of the seat plate 38 outside the left and right engagement brackets 50.
[0046]
The front ends of the left and right engagement brackets 50 are integrally connected by reinforcing ribs, and the seat plate 38 is formed with a slit 54 that surrounds the outside of the left and right engaging brackets 50 and the reinforcing ribs. The portion provided with 50 is an easily deformable portion 38a that can be easily raised and deformed upward around the rear end.
[0047]
The reinforcing rib is located at a position where a general adult touches the finger when the finger is extended from the near side of the seat plate 38. Therefore, by pushing up the reinforcing ribs upward with a finger, the left and right engagement brackets 50 can be pushed up and moved upward.
[0048]
A lower cover 55 that covers the periphery of the seat plate 4 from below is attached to the lower end of the lower cover 55, and a downwardly concave handle hole 55 is formed at the front end of the lower cover 55. A left and right long ridge 57 is provided at a position near the front end of the seat plate 38 with the slit 54 interposed therebetween, and the front end of the lower cover 55 overlaps the ridge 55.
[0049]
As clearly shown in FIG. 13, the front portion of the engagement bracket 50 is a front stopper 50 a for regulating the retreat position of the seat plate 38, and the rear portion of the engagement bracket 50 is located at the front position of the seat plate 38. The stoppers 50a and 50b have a lower height that is lower than that between them.
[0050]
Further, the rear surface of the rear stopper 50b is an inclined surface 50c. Therefore, when the female rail portion 40 of the seat plate 38 is fitted into the male rail portion 37 of the intermediate support 4, the guiding action of the inclined surface 50c is performed. Accordingly, the engagement bracket 50 can easily get over the drive pin 48 by utilizing the elastic deformation of the seat plate 38.
[0051]
The chair according to the present embodiment includes a tilt adjustment mechanism that can switch the tilt range of the backrest 7 to a plurality (four) ranges, but details are omitted because there is no direct relationship with the present invention.
[0052]
▲ 5 ▼. Adjustment of the front / back position of the seat plate There are two modes for adjusting the front / back position of the seat plate 5. One is that the chair user lifts his hips, pushes up the reinforcing ribs with his fingertips and flexes and deforms the easily deformable portion 38a, so that the left and right engaging brackets 50 and the pins 48 as shown in FIG. In this case, the front / rear position of the seat plate 5 can be adjusted extremely easily.
[0053]
Another mode is a method in which the front end of the seat 5 is grasped and pushed and pulled while a finger is hung in the pull hole 56 of the lower cover 55. In this case, the easily deformable portion 38a of the seat plate 38 is easily formed. By bending and deforming and the portion between the engaging recesses 49 adjacent to each other in front and rear is formed in an arc shape in a side view, an arbitrary engaging recess 49 can be disengaged from the pin 48.
[0054]
Since the seat plate 48 can also bend and deform as a whole, when the front end of the seat plate 5 is gripped and moved back and forth, the seat plate 38 is entirely deformed, and the engaging recess 49 and the pin 48 Contribute to the disengagement.
[0055]
Since the seat plate 38 is attached to the intermediate support member 4 so that it cannot be separated vertically, the seat 5 is rattled in the vertical direction, and the front and rear positions of the seat 5 There is no inconvenience that changes without intention.
[0056]
When the left and right engagement brackets 50 are connected by reinforcing ribs as in the present embodiment, the twisting of the easily deformable portion 38a is prevented, and the left and right engagement brackets 50 can be accurately disengaged from the pins 48. There are advantages that can be done.
[0057]
As shown by a dashed line in FIG. 12, the slit 54 can be provided outside the side stopper 53, but in this case, the engagement bracket 50 must be The pin 48 may come off from the side stopper 53 when raised.
[0058]
On the other hand, if the slit 54 is provided inside the side stopper 53, the engaging bracket 50 can be raised upward without holding the pin 48 so that the pin 48 cannot be left and right without increasing the downward height of the side stopper 53. There are advantages.
[0059]
(2). Second embodiment (FIGS. 14 and 15)
FIG. 14 shows a second embodiment. This embodiment is basically the same as the first embodiment, and is different in that an operation piece 59 is attached to a reinforcing rib connecting the left and right engagement brackets 50.
[0060]
The operation piece 59 is fitted on the reinforcing rib from below, and the claw portion 59a is engaged with the hole 60 provided in the seat plate 38 from below. Therefore, it is possible to perform one-touch mounting without requiring work such as screwing. Of course, it may be attached with a fastener such as a screw, or may be integrally formed by so-called pulling of a mold when manufacturing by an injection molding method.
[0061]
When the operation piece 59 is provided as in the second embodiment, the operation of raising the left and right engagement brackets 50 can be more easily performed (the distance from the base of the easily deformable portion 38a to the operation piece 59 becomes longer, so that the engagement is performed). The raising operation of the bracket 59 can be performed with a lighter force).
[0062]
In FIG. 15, for example, an upward engaging recess 62 is formed in the lower engaging means 61 provided on the base so as to be continuous in the front-rear direction, and fits into one engaging recess 62 in the seat plate 38. An upper engaging means 63 is provided.
[0063]
The upper engaging means 63 attaches the split claw 63 to the easily deformable portion 38a of the seat plate 38 by a snap engagement method. An operation piece 63b is provided integrally with the upper engagement means 63.
[0064]
(3). Others The present invention can be embodied in various ways other than the above-described embodiment. For example, the specific form of the upper and lower engaging means can be variously embodied. In each embodiment, the vertical engaging means is disengaged from the vertical direction. However, the vertical engaging means can be disengaged from the left and right directions in a front view of the chair.
[0065]
In addition, the upper engaging means is formed separately from the seat plate and, for example, is attached to the lower surface of the seat plate via a cushion material, so that the upper engaging means can move away from the upper engaging means or the lower engaging means. The upper engaging means is attached to the lower engaging means by attaching the upper engaging means formed separately from the seat plate to the other end of the leaf spring having one end fixed to the seat plate. It may be configured so as to be disengaged.
[Brief description of the drawings]
FIG. 1 is a front view of a chair according to a first embodiment.
FIG. 2 is a right side view.
FIG. 3 is a rear view.
FIG. 4 is a central longitudinal sectional side view of a main part.
FIG. 5 is a partial right side sectional view in a state cut at a side portion of the base.
FIG. 6 is a right side view of a main part in a separated state.
FIG. 7 is an exploded perspective view of a seat plate, an intermediate support, and a base as viewed from above.
FIG. 8 is a perspective view of the base separated from above with the intermediate support.
FIG. 9 is an exploded perspective view of a seat plate, an intermediate support, and a base as viewed from below.
FIG. 10 is an exploded perspective view of the seat plate and the intermediate support from below.
FIG. 11 is a plan view of a seat plate and a lower cover.
FIG. 12 is a bottom view of a main part of the seat plate.
FIG. 13 is a diagram showing adjustment of the seat back and forth position.
FIG. 14 is a diagram showing a second embodiment.
FIG. 15 is a diagram showing a third embodiment.
[Brief description of reference numerals]
REFERENCE SIGNS LIST 3 base 4 intermediate support 5 seat 6 back support frame 7 backrest 38 seat plate 54 link body 48 also serving as lower engaging means 49 pin 49 engaging recess 50 engaging bracket 52 as an example of upper engaging means 52 reinforcing plate 53 Side stopper

Claims (3)

A seat and a seat receiving portion for supporting the seat so as to be slidable back and forth. The seat is provided with upper engaging means, and the seat receiving portion is provided with lower engaging means. A chair in which the front and rear position of the seat can be adjusted stepwise by changing the position,
The upper engaging means is provided on the seat plate so that the upper engaging means can move away from the lower engaging means against elasticity in a direction of disengaging from the lower engaging means, and a person manually moves the upper engaging means from the lower engaging means. By moving the seat plate in the separating direction, or by pushing and pulling the seat plate back and forth to forcibly move the upper engaging means away from the lower engaging means, the front and rear position of the seat plate can be adjusted. Yes,
Chair. A base provided at the upper end of the leg, an intermediate support disposed above the base, a seat disposed above the intermediate support, a back support frame provided on the intermediate support so as to be tiltable rearward, and a back support frame. It has a backrest attached, and a spring means for elastically supporting the rearward tilt of the back support frame,
The base and the intermediate support constitute the seat receiving portion, and the intermediate support is configured to at least retreat in conjunction with the backward tilt of the backrest,
The seat is slidably mounted on the intermediate support so as to be slidable back and forth, and an upper engaging means having a downwardly concave or protruding engaging portion continuous in the front and rear direction can move upward against the elasticity. While
The base is provided with lower engaging means for engaging the upper engaging means from below, so as to be able to retreat more than the intermediate support in conjunction with the backward tilt of the backrest,
The chair according to claim 1. The seat is composed of a synthetic resin seat plate and a cushion stretched on the upper surface thereof, and a downward locking recess is provided in a front-rear direction on a portion of the seat plate where a person can reach a fingertip from a near side. By forming the intermittent upper engaging means integrally and forming a rearward opening U-shaped slit in plan view surrounding the upper engaging means, a portion of the seat plate provided with the upper engaging means, While forming an easily deformable part that can be easily raised and deformed upwards at the center,
The base is provided with lower engaging means provided with a pin that fits into the engaging recess of the upper engaging means from below, and the fitting of the engaging recess of the upper engaging means to the pin of the lower engaging means. By changing the joint position, the front and rear position of the seat is adjusted,
The chair according to claim 2.

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