JPH0956520A - Chair provided with reclining function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture the chair of improved design whose structure is simplified and manufacturing cost is low. SOLUTION: This chair is provided with a sitting seat 2, a tiltable backrest member 3, a rotation hinge for pivotally supporting the backrest member 3 relatively turnably around a horizontal shaft extended in a width direction to the sitting seat 2 and a torsion bar 45 for supporting the backrest member 3 by pressing force. The torsion bar 45 is formed by a center part bar 46 extended in a horizontal direction, a pair of side part bars 48 in the width direction formed on both side parts of the center part bar 46 and a projection part 47 formed by bending the center part of the center part bar 46. Then, a bracket 41 for supporting the center part bar 46 is provided on the rear bottom surface of the sitting seat 2 and the shape of the torsion bar 45 is set so as to abut the projection part 47 to the bottom surface of the sitting seat 2 in a state where the center part bar 46 is pivotally supported by the bracket 41 and to abut a pair of the side part bars 48 to the backrest member 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair having a so-called reclining function in which a backrest portion is tilted when a seated person leans against it.

[0002]

2. Description of the Related Art Conventionally, there is known a chair having a reclining function in which a backrest portion is tilted when a seated person leans against it. In a chair having such a reclining function, the backrest is supported by a coil spring or a gas spring in which gas is sealed inside, and when the seated person leans against the backrest while seated on the seat, this pushing Due to the pressure, the backrest portion tilts against the biasing force of the coil spring or the gas spring, whereby the seated person can obtain a comfortable resting posture.

[0003]

By the way, when a coil spring or a gas spring is applied to the chair to exert the reclining function, the structure for attaching these to the chair becomes complicated, and the parts cost and the assembly cost increase. I had a problem.

Further, the coil spring and the gas spring are bulky, and when this is attached, the appearance of the chair becomes unsightly. Therefore, if a shield is provided so as to hide the spring from the outside, there is a problem that it becomes difficult to construct a chair having a reclining function excellent in design because the shield interferes with the shield.

The present invention has been made in order to solve the above problems, and has a reclining function which is simple in structure, inexpensive in manufacturing cost, and capable of manufacturing an excellent design. The purpose is to provide a equipped chair.

[0006]

A chair having a reclining function according to claim 1 of the present invention is a chair having a reclining function having a sitting seat and a tiltable backrest member. A backrest member pivotally supporting means for supporting the backrest member so as to be relatively rotatable about a horizontal axis extending in the width direction with respect to the seat, and a torsion bar for supporting the backrest member by a biasing force. The backrest member pivotal support means is formed by a rotary hinge having a horizontal shaft connecting the rear edge portion of the seat and the front edge portion of the backrest member, and the torsion bar extends in the width direction. The central bar, a pair of side bars in the width direction bent back from both sides of the central bar, and a protrusion formed to project forward in the central part of the central bar, The protrusion is In state rather Ka is characterized in that said pair of side bars are formed so as to support the backrest members.

According to the chair having the reclining function, the backrest member leans against the biasing force of the torsion bar by leaning the back against the backrest member while the seated person is sitting on the seat. It turns around and tilts backward. When this leaning is stopped, the backrest member rotates about the horizontal axis by the biasing force of the torsion bar, and returns from the tilted state to the original position.

When the seat is not seated or when the seated person is seated and is not leaning on the backrest member, the backrest member is supported by the side bar by the biasing force of the torsion bar. The standing posture is maintained. Then, when the seated person presses the back against the backrest member, the backrest member is rotated about the horizontal axis of the rotary hinge by this pressing force, and the protruding portion is abutted against the bottom surface of the seat and the side bar The torsion bar supporting the backrest member is twisted in the central bar by the above rotation, and the backrest member is tilted until the biasing force generated by this twist and the pressing force are balanced. When the leaning against the backrest member is stopped, the backrest member returns to the original standing posture by the biasing force of the torsion bar.

A chair having a reclining function according to a second aspect of the present invention is the chair having a reclining function according to the first aspect, further comprising a biasing force adjusting means for adjusting the biasing force of the torsion bar. The urging force adjusting means is composed of a locking plate having a screw hole arranged above the protruding portion of the torsion bar, and an adjusting bolt screwed into the screw hole, and the adjusting bolt is provided in the screw hole. It is characterized in that the tip end portion is in contact with the bottom surface of the seat while being screwed.

According to the chair having the reclining function, the bolt is raised by tightening the bolt screwed into the screw hole of the locking plate, and the tip of the bolt presses the bottom surface of the seat, so that the anti-lock The force causes the protruding portion of the torsion bar to rotate downward around the axis of the central bar via the locking plate, and this rotational force accumulates the urging force due to the torsion in the central bar. The urging force of is increased. On the contrary, when the bolt is loosened, the bolt descends with respect to the locking plate, so that the accumulated amount of the urging force of the central bar is reduced and the urging force of the torsion bar is reduced.

A chair having a reclining function according to a third aspect of the present invention is the chair having the reclining function according to the first or second aspect, wherein a shaft for supporting the central bar is provided on a rear bottom surface of the seat. A bracket provided with a support is fixed, and the length of the shaft support in the width direction is
It is characterized in that it is dimensioned so that it can support the central bar over its entire length.

According to the chair having the reclining function, the central bar is supported by the shaft support in a state in which the downward bending is prevented, so that the seat back is pressed by the back of the seated person. The central bar is elastically deformed only in the twisting direction.

[0013]

1 is a perspective view showing an embodiment of a chair having a reclining function according to the present invention, and FIG. 2 is a partially cutaway perspective view of FIG. FIG.
FIG. 3 is a sectional view taken along line AA of FIG. 2. As shown in these drawings, the chair 1 includes a chair body 11 forming a skeleton, a seating seat 2 attached to the chair body 11, a backrest member 3 coupled to the seating seat 2, and a backrest member 3. A leaning member 3 and a reclining mechanism 4 (FIGS. 2 and 3) provided on the bottom of the seat 2 are provided. In the present embodiment, the chair body 11 is made of wood.

The chair body 11 includes a pair of front legs 1 in the width direction.
2, the same pair of rear legs 13, these rear legs 13 and front legs 12
The same pair of armrests 14 bridged to the top of the
4 and the same pair of beam members 15 that are passed between the front leg 12 and the rear leg 13 and a seating sheet that is passed between these beam members 15 at the front (left side of FIGS. 1 to 3). Side support plate 16
And The seat 2 is fixed to the upper part of the seat-side support plate 16.

As shown in FIG. 2, the seat 2 has the following seats.
It comprises a bottom plate 21, a pad 22 made of a cushioning material such as foamable synthetic resin, which is arranged on the bottom plate 21, and a trim 23 covering the pad 22.
In the seat 23, the trim 23 covers the surface of the pad 22, and a part of the edge of the four surroundings is folded back and fixed to the back surface of the bottom plate 21, whereby the bottom plate 21, the pad 22 and the trim 23 are integrated. Are formed. The bottom plate 21 is screwed to the seating seat side receiving plate 16 of the chair body 11 in a state in which the seating seat 2 is placed on the seating side seat receiving plate 16.

The backrest member 3 has an L-shape in a side view, and a seating portion 3a is formed in a horizontal portion, and
A backrest portion 3b is formed by a portion extending in the vertical direction. The thighs of the seated person are dimensioned so that the back is in contact with the seating seat 2 and the back is in contact with the backrest member 3 while the buttocks are located on the seating portion 3a.

The backrest member 3 is, as shown in FIG.
A bottom plate 31 provided on the bottom of the seat 3a and a backrest 3
The back plate 32 provided on the back part of b, the L-shaped side frames 33 fixed to the both side edges of the bottom plate 31 and the back plate 32, and the surface of the bottom plate 31 and the back plate 32 are arranged. It comprises a pad 34 and a trim 35 covering the surface of the pad 34. Pad 3 above
Reference numeral 4 is formed of a cushion material such as foamable synthetic resin. The trim 35 covers the outside of the pad 34 and the pair of side frames 33 in the width direction, and the four edges are folded back, and the folded back portions are fixed to the bottom plate 31 and the back plate 32. The backrest member 3 is formed in this state.

Although not shown, the seat 2
A trim may be provided so as to cover both the pad 22 and the pad 34 of the backrest member 3. By doing so, the cracks at the contact portion between the seating seat 2 and the backrest member 3 are hidden by the trim covering both of the above, the appearance is beautiful, and the buttocks are not fitted into the contact portion. It becomes possible to prevent.

FIG. 4 is a partially exploded perspective view of the chair as seen obliquely from below. As shown in this figure, a seating-side reinforcing member 17 is bridged between the pair of beam members 15 substantially in the front-rear direction and the vertical direction, and the seating-side receiving plate 16 is mounted on the seating-side reinforcing member 17. Supported by. Further, the backrest member 3 includes a pair of widthwise metal side plates 36 screwed to the side frame 33 of the bent portion. The side plate 36 includes a side plate horizontal portion 36a corresponding to the seating portion 3a so as to follow the shape of the backrest member 3 in a side view,
It has a side plate vertical portion 36b corresponding to the backrest portion 3b. Further, a protruding piece 36c is provided so as to protrude downward at the lower portion of the side plate vertical portion 36b.

A supporting square member 37 extending in the front-rear direction is fixed by a screw inside the side plate horizontal portion 36a, and a backrest side reinforcing member 39 is inserted between the side plate horizontal portions 36a at the lower front portion of the supporting square member 37. The backrest side receiving plate 38 is sandwiched between the backrest side reinforcing member 39 and the support square member 37. The seat-side reinforcing member 17 and the backrest-side reinforcing member 39 are connected by a pair of width-direction rotary hinges (backrest member pivotal support means) 18 screwed at their respective rear edge portions, whereby the backrest. The leaning member 3 is a chair body 11
On the other hand, the rotary hinge 18 is rotatable about the horizontal axis 18a.

The reclining mechanism 4 is provided on the lower surface of the seat-side reinforcing member 17. The reclining mechanism 4 includes a bracket 41 extending in the width direction and a torsion bar 45 attached to the bracket 41. The bracket 41 is a flat plate portion 42 fixed to the bottom surface of the seat seat side reinforcing member 17 by screwing.
And the front hanging portion 4 hung from the front edge of the flat plate portion 42.
3 and a U-shaped shaft support portion 44 that is hung from the rear edge of the flat plate portion 42 in a sectional view. This shaft support portion 44
A notch portion 44a that opens downward is formed in the central portion in the width direction of the. Further, in the recess of the shaft support portion 44, a pair of rubber cushion members 44b whose width direction is open at the upper side with the cutout portion 44a sandwiched is fitted.

On the other hand, the torsion bar 45 has a central portion bar 46 extending in the horizontal direction, a convex portion 47 in which the central portion of the central portion bar 46 is bent and protruding forward, and both sides of the central portion bar 46. It is composed of a pair of width direction side bars 48 formed by being bent at a substantially right angle from the portion toward the rear. The width of the protrusion 47 in the width direction is set to be slightly shorter than the width of the cutout portion 44a, and the length in the front-rear direction is set to the bracket 41.
The dimension is set longer than the length of the flat plate portion 42 in the front-rear direction.

Then, in the state where the bracket 41 is screwed to the bottom surface of the seating-side reinforcing member 17, the central bar 46 of the torsion bar 45 is mounted on the shaft supporting portion 44 via the rubber cushioning member 44b. As a result, the protruding portion 47 of the torsion bar 45 is formed in the cutout portion 44a of the shaft support portion 44.
And a front end thereof abuts the lower edge of the front hanging portion 43, and a pair of widthwise side bars 48 are provided on the backrest side reinforcing member 39 and the backrest side support plate 3 of the backrest member 3.
It is in contact with 8. The backrest member 3 by these contact
Is supported by the side bar 48 of the torsion bar 45.

The protruding portion 47 of the torsion bar 45 is provided with a biasing force adjusting means 5 for adjusting the biasing force of the torsion bar 45. This biasing force adjusting means 5
Is the screw hole 5 in the central portion that is bridged over the protruding portion 47.
It is composed of a locking plate 51 of 1a that is screwed, and an adjusting bolt 52 that is screwed into a screw hole 51a of the locking plate 51 from below. A concentric and large-diameter handle 52a is provided at the lower end of the adjustment bolt 52, and the handle 52a allows the turning operation of the adjustment bolt 52 about the axis to be easily performed.

The adjusting bolt 52 is dimensioned so that the tip end of the adjusting bolt 52 comes into contact with the bottom surface of the flat plate portion 42 of the bracket 41 with a margin while being screwed into the screw hole 51a. Then, the locking plate 51 is lowered by tightening the adjustment bolt 52, and the downward bending of the protruding portion 47 causes the central bar 46 to be twisted and the torsion bar 4 to be twisted.
The urging force of the torsion bar 45 is reduced by the action opposite to the above by loosening the adjusting bolt 52 as the urging force of 5 increases.

A stopper mechanism 6 for restricting the tilting range of the backrest member 3 is provided at the rear portion of the chair body 11 and the lower portion of the backrest member 3. The stopper mechanism 6 includes a plate 61 that is inserted between a pair of rear legs 13 in the width direction, a support square member 62 that is inserted between the projecting pieces 36c of the side plate 36, and a screw to the front edge of the support square member 62. In cross section
It is composed of a V-shaped stopper 63 and a rear end portion of the lower surface of the backrest side receiving plate 38.

In the present embodiment, the plate 61 is formed by a pair of widthwise one-sided plates 61a screwed at each base end side. The base end side of each piece plate 61a is bent upward, and the bent portion is a pair of rear legs 1
It is fixed to the inside of 3 by a screwing to a portion slightly below the connecting portion with the beam 15. Then, when the backrest member 3 is in the upright posture, as shown in FIG. 3, the upper surface of the stopper abuts against the lower surface of the plate 61, thereby preventing the backrest member 3 from bending forward. It has become so. On the contrary, the backrest member 3 rotates the hinge 18
When it is rotated clockwise about the horizontal axis 18a by a predetermined amount, the rear end portion of the lower surface of the backrest-side receiving plate 38 abuts on the upper surface portion of the plate 61, thereby preventing further backward bending. I am trying to become.

Further, in the present embodiment, a stop rubber 61b is provided at a portion of the plate 61 where the stopper 63 stops, and a similar stop rubber 38a is also provided at the rear end portion of the lower surface of the backrest side receiving plate 38. The stop rubbers 61b and 38a are provided to soften the impact when the backrest member 3 is in the standing posture or the tilted posture and to reduce the noise.

The operation of the present invention will be described below with reference to FIG. FIG. 5 is an enlarged cross-sectional view of the main part of FIG.
Shows the state where the backrest is not tilted, and (b) shows the state where the backrest is tilted. First, in a state where the chair 1 is not seated, as shown in FIG. 5A, the backrest member 3 receives a force counterclockwise about the horizontal axis 18a due to the biasing force of the torsion bar 45. Stops the stopper 63 on the plate 61
The standing posture is maintained while being stopped via b.

When the backrest member 3 is seated on the seat 2 with the upright posture described above and the back is leaned against the backrest portion 3b as shown by the white arrow in (b) of FIG. The backrest member 3 rotates clockwise around the horizontal shaft 18a of the rotary hinge 18. By this rotation, the side bar 48
Rotates in the clockwise direction around the axis of the central bar 46, and the central bar 46 is twisted to increase the biasing force. Then, the backrest member 3 is tilted until the biasing force and the pressing force by the back oppose each other. Then, when the pressing force of the back against the backrest portion 3b is increased, the tilt angle of the backrest member 3 is increased, and as a result, the rear end portion of the lower surface of the backrest side receiving plate 38 contacts the plate 61 via the stop rubber 38a. It is stopped and further tilting of the backrest member 3 is prevented.

Next, the adjustment of the urging force of the torsion bar 45 by the urging force adjusting means 5 will be described. When the protruding portion 47 of the torsion bar 45 is in the state shown by the solid line in FIG.
When the handle 52a is turned in the direction in which it is screwed into the screw hole 51a of No. 1, the adjustment bolt 52 moves upward relative to the locking plate 51, but the tip of the adjustment bolt 52 has the bracket 41.
Since it is stopped by the flat plate portion 42, the locking plate 51 moves downward.

The downward movement of the locking plate 51 causes the protruding portion 47 of the torsion bar 45 to move around the axis of the central bar 46, as indicated by the chain double-dashed line in FIG. Rotate counterclockwise. The rotation of the protruding portion 47 causes a twist in the central bar 46, and the twisting increases the biasing force of the torsion bar 45. On the contrary, the handle 5 is pulled in the direction in which the adjusting bolt 52 is pulled back from the locking plate 51.
When 2a is turned, the biasing force of the torsion bar 45 decreases. Therefore, the biasing force of the torsion bar 45 can be adjusted by adjusting the screwing amount of the adjusting bolt 52 with respect to the locking plate 51.

As described above in detail, in the present invention, since the backrest member 3 is supported by the torsion bar 45, the backrest member is supported by a coil spring or a gas spring as in the conventional case. In comparison with the above, the structure of the reclining mechanism 4 is simplified, and the parts cost and the assembly cost are reduced accordingly, and as a result, the chair 1 having the reclining function can be manufactured at a low cost.

Further, since the torsion bar 45 is formed by simply bending a wire in substantially the same plane, it is easy to make the torsion bar 45 invisible from the exterior of the chair 1. As a result, the appearance of the chair 1 can be made simpler than that using a conventional coil spring or gas spring, and the degree of freedom in design is increased, which is convenient for manufacturing the chair 1 having an excellent design.

FIG. 6 is a partially exploded perspective view showing a chair having a reclining function according to another embodiment as seen from diagonally below. In this embodiment, the reclining mechanism 40 is unitized so that the assembling accuracy and the rigidity of the chair are improved. That is, as shown in FIG. 6, the reclining mechanism 40 is composed of a metal box frame 401 and a torsion bar 45 supported by the box frame 401.

The box frame 401 is formed by a pair of side plates 402 in the width direction, a square tube member 403 sandwiched between the side plates 402 in the front portion, and a U-shaped member 404 sandwiched in the rear portion. There is. The U-shaped member 404 corresponds to the plate 61 of the previous embodiment, and the stopper 63 (FIGS. 4 and 5) stops when the backrest member 3 (not shown in FIG. 6) tilts. Has become. Square tube material 403
A U-shaped shaft support portion 440 is fixed to the rear edge portion in a cross-sectional view in which a pair of upper portions in the width direction is opened, and the central portion bar 46 is fitted into the shaft support portion 440 via the rubber cushioning material 44b. , Which causes the torsion bar 45 to move into the mold frame 4
It is attached to 01. Then, with the center bar 46 mounted on the pair of shaft support portions 440, the protruding portion 47 of the torsion bar 45 is attached to the shaft support portion 44.
The pair of side bars 48 in the width direction extends rearward from the side end portion of the shaft support portion 440 between the side plates 402 while protruding forward from the gap between 0s.

A receiving metal fitting 405 is attached to the central portion in the width direction in front of the lower surface of the square tubular member 403. The receiving fitting 405 is formed by bending a flat plate made of metal so as to have a J-shape in a side view. Due to the above-mentioned bending, the flat plate portion 4 is attached to the receiving fitting 405.
06 and a hook portion 407 that is opened forward and rearward of the flat plate portion 406 are formed. Then, the receiving member 405 is fixed to the square tube member 403 by welding the back surface of the flat plate portion 406 to the bottom surface of the square tube member 403.

The hook portion 40 of such a receiving member 405
7, the relative position of the shaft support portion 440 and the receiving metal fitting 405 is set so that the tip of the protruding portion 47 of the torsion bar 45 protruding forward from the gap between the shaft support portions 440 fits in. By doing so, the protruding portion 47 is rotatable about the axis of the central bar 46 between the upper and lower gaps of the hook portion 407. Further, the locking plate 51 and the adjusting bolt 5 are attached to the protruding portion 47 located on the hook portion 407.
A biasing force adjusting means 5 similar to that of the previous embodiment consisting of 2 is attached.

On the other hand, the recess 15 into which the side plate 402 is fitted is provided on each inner side surface of the pair of beam members 15 in the width direction of the chair body 11.
a is provided as a recess, and a pair of side plates 4 in the width direction is provided in these recesses 15a.
The frame frame body 401 is fixed to the chair body 11 by screwing it in a state in which 02 is fitted.

If such a frame 401 is adopted,
In the process of assembling the chair 1, the reclining mechanism 40 can be installed in the chair body 11 simply by disposing the box-shaped frame 401 having the torsion bar 45 mounted between the beam members 15 and screwing.
Therefore, it is convenient for improving the assembling accuracy of the chair 1 and the rigidity of the chair 1.

In the above embodiment, the chair body 11
Is made of wood, but the chair body 11 is not limited to being made of wood, and may be made of metal.

Further, in the above embodiment, the backrest member 3 is formed of the seating portion 3a and the backrest portion 3b, but the seatback portion 3a is not provided, and the backrest member 3 is provided only. It may be formed. However, in this case,
If the seat 2 is made deep and the torsion bar is bent so that the projecting portion 47 and the side bar 48 are substantially perpendicular to each other with the central bar 46 as a boundary. Good.

[0043]

According to the chair provided with the reclining function according to the first aspect of the present invention, since the chair supports the backrest member by the biasing force of the torsion bar, the conventional coil spring is used. The structure for reclining is simpler than that of the conventional one, which contributes to the reduction of the material cost correspondingly, which is convenient in manufacturing the chair at low cost.
Moreover, the presence of the torsion bar can be made invisible from the appearance of the chair, and by doing so, it is possible to make the appearance of the chair simple, which is effective in creating a chair with excellent design. Is.

The torsion bar includes a center bar extending in the width direction, a pair of side bars in the width direction bent rearward from both sides of the center bar, and a front part in the center of the center bar. And a pair of side bars formed so as to support the backrest member in a state where the protrusions are not moved, the backrest is supported by a seated person. When the member is not pressed, the backrest member maintains the standing posture supported by the side bars by the biasing force of the torsion bar, and when the seated person presses the backrest member, the backrest member pushes this push member. The pressure causes the rotary hinge to rotate about the horizontal axis, and this rotation causes the central bar to be twisted, and the backrest member tilts until the biasing force due to this twist and the pressing force are balanced.

As described above, it is possible to apply a biasing force to the torsion bar with a simple structure so that the backrest member tilts against the biasing force of the torsion bar when the seated person leans against it. This is effective in reducing costs.

According to the chair having the reclining function according to the second aspect of the present invention, since the chair is provided with the biasing force adjusting means for adjusting the biasing force of the torsion bar, the biasing force adjusting means is adjusted. By doing so, it is possible to adjust the biasing force of the torsion bar to a desired strength, which is convenient in using the chair more comfortably.

The biasing force adjusting means is composed of a locking plate having a screw hole arranged above the protruding portion of the torsion bar, and an adjusting bolt screwed into the screw hole.
Since the tip of the adjustment bolt is in contact with the bottom surface of the seat while being screwed into the screw hole, the bolt is raised by tightening the screw screwed into the screw hole of the locking plate. Since the tip of the torsion bar presses the bottom surface of the seat, the reaction force causes the protrusion of the torsion bar to rotate downward around the axis of the central bar through the locking plate, and this rotation causes the central bar to rotate. The biasing force due to the twist is accumulated in the, and this increases the biasing force of the torsion bar. On the contrary, when the bolt is loosened, the bolt descends with respect to the locking plate, so that the accumulated amount of the urging force of the central bar is reduced and the urging force of the torsion bar is reduced.

As described above, the urging force of the torsion bar can be easily adjusted by the tightening / loosening operation of the bolt, which is convenient for making the reclining state easier and quicker and more comfortable.

According to the chair having the reclining function of the third aspect of the present invention, the bracket having the shaft supporting portion for supporting the central bar is fixed to the rear bottom surface of the seat, and the shaft supporting portion is fixed. Since the length in the width direction of the center bar is dimensioned so that the center bar can be supported over the entire length, the center bar can be twisted only in the direction in which the seat back is pressed by the seated person's back. Without elastic deformation,
As a result, the center bar generates a biasing force due to twisting over the entire length, effectively functions as a torsion bar, and is convenient for surely supporting the backrest in the reclining state.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a chair having a reclining function according to the present invention.

2 is a partially cutaway perspective view of the chair having the reclining function of FIG. 1. FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a partial exploded perspective view of a chair having a reclining function, which is viewed from diagonally below.

5A and 5B are enlarged cross-sectional views showing a main part of FIG. 3, in which FIG. 5A shows a state in which the backrest portion is not tilted, and FIG. 5B shows a state in which the backrest portion is tilted.

FIG. 6 is a partial exploded perspective view showing a chair having a reclining function according to another embodiment as viewed from diagonally below.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Chair 11 Chair body 12 Front leg 13 Rear leg 14 Armrest 15 Beam member 16 Seating seat side support plate 17 Seating seat side reinforcement 18 Rotating hinge 18a Horizontal axis 2 Seating seat 21 Bottom plate 22 Pad 23 Trim 3 Backrest member 3a Seating part 3b Backrest part 31 Bottom plate 32 Back part plate 33 Side frame 34 Pad 35 Trim 36 Side plate 36a Side plate horizontal part 36b Side plate vertical part 36c Projection piece 37 Support square member 38 Backrest side receiving plate 39 Backrest side reinforcement 4,40 Reclining mechanism 41 Bracket 42 Flat plate portion 43 Front hanging portion 44 Shaft support portion 44a Cutout portion 44b Rubber cushioning material 45 Torsion bar 46 Central portion bar 47 Convex portion 48 Side portion bar 401 Frame frame body 402 Side plate 403 Square tube member 405 U-shaped member 405 Receiver 406 Flat plate 5 Biasing force adjusting means 51 Locking plate 1a threaded hole 52 adjusting bolt 52a the handle 6 stopper mechanism 61 plate 62 supporting square bar 63 stopper

Claims (3)

[Claims] 1. A chair having a reclining function having a seating seat and a tiltable backrest member, wherein the backrest member is relatively rotated about a horizontal axis extending in the width direction with respect to the seating seat. The backrest member pivotally supporting means for supporting the backrest member by a biasing force, and the backrest member pivotally supporting means for supporting the backrest member by the biasing force. The torsion bar is formed by a rotary hinge having a horizontal axis that connects the front edge of the leaning member, and the torsion bar has a central bar extending in the width direction and a width direction bent rearward from both sides of the central bar. A pair of side bars and a protrusion formed so as to protrude forward at the center of the center bar, and the pair of side bars are a backrest member in a state where the protrusions are immobile. Formed to support A chair with a reclining function that is characterized by being 2. An urging force adjusting means for adjusting the urging force of the torsion bar is provided, and the urging force adjusting means includes a locking plate having a screw hole arranged on an upper portion of the protruding portion of the torsion bar, 2. An adjusting bolt screwed into the screw hole, wherein the adjusting bolt has a tip end in contact with the bottom surface of the seat when screwed into the screw hole. A chair with a reclining function. 3. A bracket having a shaft supporting portion for supporting the central bar is fixed to a bottom surface of a rear portion of the seat, and the shaft supporting portion supports the central bar over the entire length. The chair with a reclining function according to claim 1 or 2, wherein the chair is dimensioned so that the chair can be moved.