JP6148905B2 - Chair - Google Patents

Description

  The present invention relates to a chair with improved seating stability.

  As for the general chair used for office work etc., the seat board which is the frame part of a seat is supported by the upper end of a leg part via seat receiving members, such as a slide frame (for example, patent documents 1-1). 3).

In the chairs described in Patent Documents 1 to 3, an engagement groove having a substantially U-shaped cross section that extends along the front-rear direction and opens upward or downward, and a protrusion that engages with the engagement groove have a seat support. Provided between the member and the seat plate, the vertical displacement of the seat plate relative to the seat receiving member is regulated by another displacement regulating means (drop-off preventing means).
In the case of these chairs, since the displacement restricting means is provided separately from the engaging grooves and ridges that are engaged with each other, the number of parts increases and the structure tends to be complicated. For this reason, the chair which improved this point is devised now (for example, refer patent documents 4 and 5).

The chairs disclosed in Patent Documents 4 and 5 are provided with engaging grooves having a substantially U-shaped cross-section extending along the front-rear direction and opening in the width direction at both left and right edges of the seat plate. Flange portions that engage with the left and right engaging grooves of the seat plate are provided at both left and right edges of the member, and the displacement (dropout) of the seat plate relative to the seat receiving member is caused by the flange portion and the engaging groove. It is blocked by engagement. In these chairs, the engagement groove on the seat plate side is provided over almost the entire region in the front-rear direction of the seat plate, so that the vertical displacement of the seat plate is regulated over the entire region in the front-rear direction.
Moreover, in the chair described in Patent Document 5, the seat plate is formed of a flexible synthetic resin from the viewpoint of moldability and sitting comfort.

Japanese Patent No. 4804619 Japanese Patent No. 3769491 Japanese Patent No. 4202687 JP 2002-223886 A Japanese Patent No. 3967150

By the way, in this kind of chair, in order to improve the seating stability of the seated person, when the seated person sits on the seat, the seated person's buttocks are wrapped from the left-right direction (they do not shift in the left-right direction). It is desirable that the seat plate bend and deform. In this respect, the chair described in Patent Document 5 in which the seat plate is formed of a synthetic resin that is easily bent is preferable, but there is room for further improvement in the following points.
In the chair described in Patent Document 5, since the displacement in the vertical direction is regulated by the seat receiving member in almost the entire front-rear direction of the side edge of the seat plate, when the seated person sits on the seat body, Although the substantially central region in the left-right direction is curved and deformed downward, the relative position in the vertical direction is only slightly higher in the side portions of the seated person's buttocks on the seat plate than in the central region. For this reason, it was difficult to say that the effect of preventing the seated person's buttocks from shifting appropriately.

  Accordingly, the present invention improves the seating stability of the seat body by preventing the seat plate from being detached from the seat receiving member and ensuring that the side of the buttocks of the seated person is securely held when the seated person is seated. It is intended to provide a chair that can be used.

The chair according to the present invention employs the following configuration in order to solve the above problems.
The chair according to the present invention is a chair in which a seat plate constituting a skeleton portion of a seat body is supported by a leg portion via a seat receiving member, and the left and right side edges of the seat plate are vertically moved on the seat receiving member. A restraint support portion that regulates and supports the displacement in the direction is provided, and a supported portion supported by the restraint support portion is provided at each of the left and right side edge portions of the seat plate. The side edge portion is allowed to be warped and deformed in an area behind the engaging portion between the restraining support portion and the supported portion of each side edge portion without restricting upward displacement of the seat receiving member. A warpage allowance portion is provided.
As a result, when a seated person sits on the upper part of the seat and the load of the seated person acts on the seat plate, the seat plate is mainly supported by the seat receiving member at the left and right side edges, and the seat The drop-off from the member is restricted by the engagement between the restraining support portion on the seat receiving member side and the supported portion on the seat plate side. Further, when the seated person's load acts on the rear side region with respect to the engagement portion between the restraining support portion and the supported portion, the left and right warp allowance portions of the rear side region warp upward and deform, and the seated person's buttocks Hold the left and right from the side.

It is desirable that a displacement restricting portion for restricting a vertical displacement with respect to the seat receiving member is provided in a substantially intermediate region between the warp allowing portions on both the left and right sides of the seat plate.
In this case, if the rear edge side of the seat plate tries to be displaced in the vertical direction due to a change in the seating posture of the seated person, the displacement is regulated by the displacement regulating unit, and the tilting of the seat plate in the front-rear direction is suppressed. Become. Further, the vertical displacement on the seat plate is restricted as compared to the case where the vertical displacement of the seat plate is restricted only by the engagement of the restraining support portion on the seat receiving member side and the supported portion on the seat plate side. Therefore, the backlash of the seat plate can be effectively suppressed.

Moreover, it is preferable that the seat receiving member is provided with a downward displacement restricting surface that is disposed so as to be able to come into contact with the lower surface of the rear side region with respect to the supported portion of the seat plate.
In this case, when the load acts on a part of the rear edge side of the seat plate due to a change in the seating posture of the seated person, the partial sinking of the rear edge portion of the seat plate is caused by the downward displacement regulating surface. It will be suppressed.

One of the restraint support part and the supported part is configured by an engagement groove extending along the front-rear direction and opening in either the left or right direction, and the other of the restraint support part and the supported part is the You may make it comprise with the protrusion which engages with an engaging groove.
In this case, it is possible to easily assemble the restraint support portion and the supported portion by engaging the protrusion with the engagement groove from the front-rear direction.

Furthermore, the engagement groove and the protrusion are configured to be slidable in the front-rear direction, and the seat plate is adjusted in position in the front-rear direction with respect to the seat receiving member via the engagement groove and the protrusion. It may be made possible.
In this case, it becomes possible to adjust the seat plate to an arbitrary position in the front-rear direction with respect to the seat receiving member by using the engagement groove and the protrusion, and the engagement is possible even when the position is adjusted to any position in the front-rear direction. The vertical displacement of the seat plate can be regulated by the engagement between the groove and the protrusion.

It is desirable that the warp allowance portion of the seat plate is provided with a bending promotion structure that facilitates bending deformation in the surface direction.
In this case, when the seated person's load acts on the rear side region of the supported portion of the seat plate, the warp allowing portion easily warps and deforms.

Further, it is more desirable that the bending promoting structure is a structure having directivity that lowers the bending rigidity in the left-right direction while maintaining the rigidity in the front-rear direction of the seat plate.
In this case, when the load of the seated person is applied to the rear side region of the supported portion of the seat plate, the bending (warping) deformation in the left-right direction is promoted without causing a large bending deformation in the front-rear direction of the warp allowing portion. Will come to be.

The bending promoting structure includes a plurality of reinforcing ribs provided along the front-rear direction in the seat plate, and a plurality of lightening holes provided intermittently on a general surface between adjacent reinforcing ribs of the seat plate, It can be set as the structure provided with.
In this case, the rigidity in the front-rear direction of the warp allowance portion is maintained by the plurality of reinforcing ribs, and the bending rigidity in the left-right direction is kept low by the plurality of lightening holes between the adjacent reinforcing ribs.

  According to the present invention, the vertical displacement of the seat plate relative to the seat receiving member is restricted by the engagement of the restraining support portion on the seat receiving member side and the supported portion on the seat plate side, and the load of the seated person is applied to the seat plate. When acted, the warp allowance part in the rear side region than the supported part of the seat plate warps and deforms upward so that the left and right sides of the seated person's buttocks can be securely held from the side. The seating stability of the seat body can be further enhanced while preventing the dropout.

It is a side view of the chair of 1st Embodiment of this invention. It is a perspective view in the state where the leg part of the chair of a 1st embodiment of this invention was removed. It is a top view of the seat of the chair of 1st Embodiment of this invention. It is a front view of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is a left view of the seat and the seat receiving member of the chair of 1st Embodiment of this invention. It is a bottom view of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is sectional drawing corresponding to the AA cross section of FIG. 6 of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is sectional drawing corresponding to the BB cross section of FIG. 6 of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is sectional drawing corresponding to CC cross section of FIG. 6 of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is sectional drawing corresponding to the DD cross section of FIG. 6 of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is sectional drawing corresponding to the EE cross section of FIG. 6 of the seat body and seat receiving member of the chair of 1st Embodiment of this invention. It is the bottom view which removed some components of the seat receiving member of the chair of 1st Embodiment of this invention. It is a bottom view of the seat board of the chair of 2nd Embodiment of this invention. It is a bottom view of the seat board of the chair of 3rd Embodiment of this invention. It is sectional drawing corresponding to the FF cross section of FIG. 14 of the seat plate of the chair of 3rd Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the direction indicated by the arrow FR in the figure facing the front of the person seated in the chair in a regular posture is referred to as “front”, and the opposite direction is referred to as “rear”. For “upper”, “lower”, “left”, and “right”, the direction indicated by the arrow UP in the figure above the person sitting on the chair in a regular posture is “up” and the opposite direction is “ The direction indicated by the arrow LH on the left side of the person sitting in the normal posture on the chair 1 is called “left”, and the direction opposite to that is called “right”.

First, the first embodiment shown in FIGS. 1 to 12 will be described.
FIG. 1 is a side view showing the overall configuration of the chair 1 of this embodiment, and FIG. 2 is a perspective view of the chair 1 with some parts removed, as seen from obliquely below.
As shown in these drawings, a chair 1 according to this embodiment includes a leg 2 placed on a floor F, a box-shaped support base 3 installed at the upper end of the leg 2, and a seated person. A seat body 4 that is attached to the upper surface of the support base 3 and supports the seat body 4, and supports the back of a seated person that extends from the support base 3 to the rear upper side and is seated on the seat body 4. And a backrest portion 6.
The leg 2 includes a multi-leg 7 with casters 7 a and a pedestal 8 that stands up from the center of the multi-leg 7 and incorporates a gas spring as a lifting mechanism, and has a support base 3 at the upper end of the pedestal 8. Is mounted so as to be rotatable in the horizontal direction. The support base 3 incorporates an elevation adjustment mechanism for the pedestal column 8 and a tilt adjustment mechanism for the backrest 6. The backrest 6 includes a backrest support frame 9 having a substantially L shape in side view, and a backrest body that directly supports the back of a seated person attached to the front surface of the backrest support frame 9 and seated on the seat 4. 10, and the lower end of the front portion of the back support frame 9 is coupled to the tilt adjustment mechanism in the support base 3.
1 and 2, reference numeral 11 is a pivot shaft of the backrest support frame 9 on the support base 3, and reference numeral 12 is an operation knob of a tilt adjustment mechanism protruding from the side surface of the support base 3. is there. Moreover, the code | symbol 90 in FIG. 1 is an armrest attached to the lower surface of the both sides of the seat body 4 as an additional component.

3, 4, and 5 are a top view, a front view, and a left side view of the seat body 4 and the seat receiving member 5, and FIGS. 6 to 11 are sectional views of the seat body 4 and the seat receiving member 5. is there.
The seat body 4 includes a seat plate 13 that forms a skeleton portion, and a seat body 14 that is attached to the upper portion of the seat plate 13. The seat body 14 is not shown in detail, but a seat frame (not shown) attached to the outer peripheral edge of the seat plate 13, a cushion material (not shown) made of urethane or the like installed on the upper surface of the seat plate 13, And a sheet skin material 15 that is stretched over the seat frame and covers the upper side of the cushion material.

The seat plate 13 is formed of a synthetic resin having elasticity, and has a substantially rectangular shape with rounded four corners as viewed from above, as shown in FIGS. The left and right sides of the seat plate 13 are slightly narrowed toward the rear side, and the arc at the corner on the rear side is larger than the arc at the corner on the front side.
Moreover, as shown in FIGS. 7-9, the seat board 13 is formed so that the predetermined range of the center of the left-right direction may become substantially horizontal in a regular installation state. Here, assuming that the substantially horizontal region is referred to as a central region 13a, inclined regions 13b that are inclined upward with respect to the central region 13a are continuously provided on the left and right sides of the central region 13a of the seat plate 13. ing. Therefore, the entire area of the seat plate 13 has a shape in which a substantially central portion in the left-right direction is slightly depressed in a concave shape.

A continuous shielding wall 16 that also serves as a reinforcing rib projects downward from the peripheral edge of the seat plate 13 excluding the central region of the rear side of the seat plate 13. The shielding wall 16 functions to conceal that the lower surface of the seat plate 13 is visible from the side and restrict excessive deformation of the entire seat plate 13. On the lower surface of the left and right side edge portions of the seat plate 13, a support wall 17 is provided in the side region of the shielding wall 16 so as to extend in the front-rear direction close to the inner side in the left-right direction. Two inward flanges 18 </ b> A and 18 </ b> B project from the inner side surface (the surface facing inward in the left-right direction) of each support wall 17. As shown in FIG. 8, these inward flanges 18 </ b> A and 18 </ b> B are substantially U-shaped engagement openings that open inward in the left-right direction together with the support walls 17 and the lower surface of the seat plate 13 adjacent to the support walls 17. A joint groove 19 is formed.
As shown in FIGS. 3 and 6, one inward flange 18 </ b> A projecting from each support wall 17 is disposed at a position near the front portion in the front-rear direction of the seat plate 13, and the other inward flange 18 </ b> B is The seat plate 13 is disposed at a substantially central position in the front-rear direction. Further, as shown in FIG. 7, a notch portion 20 is provided in a region between the front and rear inward flanges 18 </ b> A and 18 </ b> B of the left support wall 17, and a lock lever 21 for locking the front / rear position of the seat body 4. The tilting operation is allowed by the notch 20.
The lock lever 21 of this embodiment is formed integrally with a release operation knob 22 held by an operator, and is pivotally supported on the lower surface of the left side portion of the seat plate 13 together with the release operation knob 22. . The lock lever 21 and the release operation knob 22 are urged by a biasing spring (not shown) in a locking direction to bring the tip end portion of the lock lever 21 close to the lower surface of the seat plate 13. Is turned in the unlocking direction by a pulling-up operation.

Further, a plurality of reinforcing ribs 23 extending in the front-rear direction are provided on the lower surface of the seat plate 13 so as to protrude at substantially equal intervals. The protruding heights of these reinforcing ribs 23 are set lower than the protruding heights of the shielding wall 16 and the supporting wall 17 on the lower surface of the seat plate 13. The reinforcing ribs 23 are provided over almost the entire area of the lower surface of the seat plate 13 except for a predetermined range of the side end portions of the left and right inclined regions 13b and a partial range of the central region 13a. Further, as shown in FIG. 8, the height of the reinforcing ribs 23 of the reinforcing ribs 23 formed in the left and right inclined regions 13 b of the seat plate 13 gradually decreases toward the ends in the left-right direction. For this reason, the rigidity of each inclination area | region 13b is gradually low toward the edge part of the left-right direction.
Further, a cylindrical boss portion 24 protrudes from a lower surface of the seat plate 13 near the rear portion of the central region 13a, and a locking flange 25 protruding in the left-right direction is integrally formed at the lower end of the boss portion 24. ing. The functions of the boss portion 24 and the locking flange 25 will be described in detail later.

On the other hand, the seat receiving member 5 includes a base plate 26 made of a metal plate and directly supporting the seat plate 13, and a synthetic resin lower plate 27 interposed between the base plate 26 and the support base 3. . The lower plate 27 is placed on the upper surface of the support base 3, and the base plate 26 is fixed to the support base 3 by a fixing means (not shown) in a state where the lower plate 27 is sandwiched between the lower plate 27 and the support base 3.
FIG. 12 is a bottom view of the base plate 26 of the seat receiving member 5.
As shown in the figure, the base plate 26 has a substantially rectangular shape with rounded corners on the rear side when viewed from above. As shown in FIGS. 7 to 9, the base plate 26 is formed so that a predetermined range in the center in the left-right direction is substantially horizontal in a normal installation state. Assuming that the substantially horizontal region is called a central region 26a, like the seat plate 13, on both the left and right sides of the central region 26a of the base plate 26, there are inclined regions 26b inclined upward with respect to the central region 26a. It is connected continuously. A standing wall 28 that rises upward is provided in the entire area of the outer peripheral end of the base plate 26. An outward flange 29, which is a protrusion that is inserted and engaged with the engagement groove 19 on the seat plate 13 side, projects from the upper end portion of the standing wall 28 positioned on the left and right sides of the base plate 26.
The left and right outward flanges 29 are provided in a range extending from a substantially central portion of the base plate 26 in the front-rear direction to the front end portion. However, a part of each outward flange 29 is provided with a notch 30 for assembly for assembling the seat plate 13 to the base plate 26.
When the seat plate 13 is assembled to the seat receiving member 5, an inward flange 18 </ b> A on the front side of the seat plate 13 is inserted into the notched portion 30 of the outward flange 29 from above. When the seat plate 13 is moved to the front side in this state, the left and right outward flanges 29 of the seat receiving member 5 are respectively engaged in the left and right engaging grooves 19.

Here, the seat plate 13 has a substantially U-shaped engaging groove 19 on both left and right edges engaged with the outward flanges 29 on both left and right sides of the seat receiving member 5, so that a substantially central portion in the front-rear direction is provided. The vertical displacement of the region extending from the front side to the front side is regulated by the seat receiving member 5. As a result, the seat plate 13 is supported by being suspended from the seat receiving member 5 at the left and right side edges in a region extending from a substantially central portion in the front-rear direction to the front side. In this embodiment, the outward flanges 29 on the left and right sides of the seat receiving member 5 constitute a restraining support shaft portion that restricts and supports the displacement of the side edge of the seat plate 13 in the vertical direction. The engaging grooves 19 on both sides constitute a supported portion that is supported by the restraining support portion on the seat receiving member 5 side.
On the other hand, the portion of the left and right inclined regions 26b of the seat plate 13 that is located rearward of the engagement groove 19 (inward flange 18B) is not restricted by the seat receiving member 5 from being displaced upward. The warp permitting portion 40 is allowed to warp and deform in the end direction.

Further, a small outward flange 34 is formed in a region where there is no outward flange 29 at the upper end of the standing wall 28 at the outer peripheral end of the base plate 26, and the upper surface of the small flange 34 is the seat plate. 13 is arranged to face the lower surface of 13. In this embodiment, the upper surface of the small flange 34 located on the rear side of the outward flange 29 on the base plate 26 is in contact with the lower surface of the rear side region of the seat plate 13 rather than the inward flange 18B. A downward displacement regulating surface that regulates downward displacement of the region of the plate 13 is configured.
2 and 6, reference numeral 35 denotes a plurality of fitting holes of the lock lever 21 provided along the front-rear direction on the left side edge near the front portion of the base plate 26, and reference numeral 36 denotes an armrest. It is an attachment part for attaching 90 (refer FIG. 1).

  Further, as shown in FIGS. 9, 11, and 12, a recessed portion 31 that is recessed in the upper side is provided on the rear edge of the central region 26 a of the base plate 26 at a substantially central position in the left-right direction. A slit 32 having a predetermined length extending along the front-rear direction is formed at the bottom of the recess 31. A boss 24 is slidably inserted into the slit 32 so as to protrude from the lower surface of the seat plate 13. In addition, the code | symbol 32a in a figure is a widening part provided in the front-end part of the slit 32, and the latching flange 25 of the front-end | tip of the boss | hub part 24 is inserted at the time of an assembly | attachment. When the boss portion 24 protruding from the seat plate 13 is disposed in the slit 32 of the base plate 26 and the locking flange 25 at the tip of the boss portion 24 is disposed below the recessed portion 31, When the locking flange 25 comes into contact with the base plate 26, the vertical displacement of the seat plate 13 is restricted. In this embodiment, the boss portion 24, the locking flange 25, the slit 32, and the like cause the vertical displacement of the seat plate 13 relative to the seat receiving member 5 in a substantially intermediate region of the warp allowance portion 40 on both sides of the seat plate 13. A displacement restricting portion to be restricted is configured.

  On the other hand, as shown in FIG. 6, the lower plate 27 has a substantially square shape with two corners on the front side rounded in a top view (bottom view), and is superimposed on the bottom surface of the central region of the base plate 26. It is fixed by welding. A reinforcing wall 33 bent in a substantially U-shaped cross section is continuously provided on the lower side between the front edge portion and the left and right side edge portions of the lower plate 27. The reinforcing wall 33 increases the rigidity of the peripheral edge of the central region 26 a of the base plate 26, and when the seat receiving member 5 is mounted on the support base 3, the front edge portion on the upper side of the support base 3 and the sides on both sides thereof. It covers the outside of the edge. In addition, the lower plate 27 covers the lower portion of the recess 31 on the rear edge side of the base plate 26 in a state where the lower plate 27 is overlaid on the lower surface of the base plate 26.

  When the seated person sitting on the chair 1 adjusts the front-rear position of the seat body 4 with respect to the support base 3 or the backrest part 6, the seated person pulls up the release operation knob 22 on the left side of the seat body 4 and sits down. 4 is released, and the seat body 4 is adjusted to an appropriate front-rear position with respect to the seat receiving member 5 in this state. At this time, the back and forth movement of the seat body 4 with respect to the seat receiving member 5 is caused by relative movement (sliding) of the outward flange 29 on the side of the seat receiving member 5 in the engaging groove 19 on the side edge portion on the front side of the seat body 4. And the boss 24 projecting from the rear lower surface of the seat body 4 is moved relative to the slit 32 at the rear edge of the seat receiving member 5. Thus, after the seated person releases the grip of the release operation knob 22 after adjusting the front / rear position of the seat body 4 to an appropriate position, the lock lever 21 receives the force of the urging spring and returns to the initial position. The coupling claws are fitted into the corresponding fitting holes 35 on the left side of the seat receiving member 5. As a result, the front-rear position of the seat body 4 is fixed at an appropriate position.

  When a seated person sits on the seat body 4 of the chair 1 from this state, the load of the seated person is input to the seat plate 13 made of synthetic resin through the seat body 14. When the load is thus input to the seat plate 13 from above, as shown in FIG. 8, the load is received by the seat receiving member 5 at the engagement groove 19 portions (the lower surface of the seat plate 13) on the left and right side edges of the seat plate 13. The left and right outward flanges 29 are mainly supported. At this time, the region extending from the vicinity of the center portion in the front-rear direction to the front end side of the seat plate 13 in which the vertical displacement is restrained by the engagement between the engagement groove 19 and the outward flange 29 receives a load from above. The central region 13a is slightly bent and deformed downward. At this time, if the load of the seated person acts on the rear side region of the engaging portion between the engaging groove 19 of the seat plate 13 and the outward flange 29 of the seat receiving member 5, the upward displacement is caused by the seat receiving member 5. As shown by the arrows in FIG. 9, the warp allowance portions 40 on the left and right edges on the rear side of the seat plate 13 that is not regulated warp and deform upward. As a result, the left and right edges (warp allowance 40) on the rear side of the seat plate 13 are pushed up so as to be close to the left and right sides of the seat occupant's buttocks, and the seat occupant's buttocks are held from the side. Become so.

Further, in this chair 1, the seat plate 13 is engaged in the region extending from near the center in the front-rear direction to the front end side by the engagement grooves 19 on the left and right side edges and the outward flange 29 of the seat receiving member 5. Therefore, even if the seating posture of the seated person is changed or a biased load is applied to the seat body 4, the seat body 4 from the seat receiving member 5 can be moved. It is possible to reliably prevent the dropout.
In particular, in this embodiment, the locking flange 25 provided on the boss portion 24 can come into contact with the lower edge portion of the slit 32 on the seat receiving member 5 side at the center on the rear edge portion side of the seat plate 13. Therefore, the central lifting on the rear edge side of the seat plate 13 can be reliably restricted by the displacement restricting portion including the boss portion 24, the locking flange 25, the slit 32, and the like. In this embodiment, the vertical displacement of the seat plate 13 is restricted only by the engagement between the left and right engagement grooves 19 of the seat plate 13 and the outward flange 29 of the seat receiving member 5. Since the distance between the parts that regulate the vertical displacement of the seat plate 13 is shortened, the backlash of the seat plate 13 can be more effectively suppressed.
The boss portion 24, the locking flange 25, the slit 32, and the like that restrict the vertical displacement at the center on the rear edge side of the seat plate 13 can be omitted.

  Further, in the case of the chair 1 of this embodiment, the seat receiving member 5 is provided with a small flange 34 that faces the lower surface on the rear side of the engagement groove 19 of the seat plate 13. Even if the load acts on a part of the rear edge portion side of the seat plate 13 due to a change in the seat plate 13 or the like, partial subduction of the rear edge portion of the seat plate 13 can be suppressed by the small flange 34. it can. In particular, in the case of this embodiment, since the small flange 34 is provided at the upper end of the standing wall 28, the sinking load of the seat plate 13 can be supported more rigidly.

  In this embodiment, engagement grooves 19 extending along the front-rear direction and opening inward in the left-right direction are provided at the left and right edges of the seat plate 13 and the left and right edges of the seat receiving member 5. An outward flange 29 which is a protrusion engaged with the engagement groove 19 is provided at the portion, and the restraint support portion and the seat receiving member 5 on the seat plate 13 side by the engagement groove 19 and the outward flange 29. Since the supported portion on the side is configured, the restraining support portion on the seat plate 13 side and the supported portion on the seat receiving member 5 side are obtained by engaging the outward flange 29 in the engagement groove 19 from the front-rear direction. There is an advantage that can be easily assembled.

  Furthermore, in the case of this embodiment, the left and right outward flanges 29 of the seat receiving member 5 are inserted and engaged in the left and right engaging grooves 19 of the seat plate 13, and the seat plate 13 is seated via these engaging portions. Since the position of the member 5 can be adjusted in the front-rear direction, the seat plate 13 is engaged by the engagement of the engagement groove 19 and the outward flange 29 when the seat plate 13 is adjusted to any position in the front-rear direction. It is possible to reliably regulate the displacement in the vertical direction.

Next, the second embodiment shown in FIG. 13 will be described. In each of the embodiments described below, the same reference numerals are given to common portions with those of the first embodiment, and redundant description will be omitted.
FIG. 13 is a bottom view of the seat plate 113 portion of the seat body 104. The chair of this embodiment is different from the first embodiment only in the structure of the seat plate 113, and other parts are the same as those of the first embodiment.
Engaging grooves 19 are provided in both the left and right edge portions of the seat plate 113 in the same manner as in the first embodiment, and warpage on the rear side of the engagement grooves 119 at the left and right side edge portions of the seat plate 113 is allowed. The portion 140 (inclined region 113b) is provided with a structure for promoting bending. A plurality of reinforcing ribs 23 extending along the front-rear direction are provided at equal intervals on the lower surface of the seat plate 113, and side end portions of the warp allowance portion 140 (inclined region 113 b). In addition, a part without the reinforcing ribs 23 is provided in a part of the region (the central region 113a) between the left and right warp allowing portions 140.

The warp allowing portion 140 (inclined region 113b) of the seat plate 113 includes the plurality of reinforcing ribs 23 and a plurality of lightening holes 50 formed intermittently on a general surface between the adjacent reinforcing ribs 23 and 23. And. In the case of this embodiment, each lightening hole 50 is formed in a long hole shape that is long in the front-rear direction.
Since the warp allowance portion 140 of the seat plate 113 includes a plurality of reinforcing ribs 23 along the front-rear direction and the lightening holes 50 disposed between the adjacent reinforcing ribs 23, 23, the rigidity in the front-rear direction is increased. Is maintained high by the reinforcing rib 23, and the rigidity in the left-right direction is weakened by the hollow holes 50. The warp allowance portion 140 of this embodiment employs a bending promoting structure having directivity that lowers the bending rigidity in the left-right direction while maintaining the rigidity in the front-rear direction of the seat plate 113.

  In the chair of this embodiment, a plurality of lightening holes 50 are provided in the warp allowance portion 140 of the seat plate 113, thereby facilitating bending deformation in the surface direction of the warp allowance portion 140. The warp deformation of the warp allowance portion 140 when the load acts on the rear side region of the engagement groove 19 of the seat plate 113 can be obtained more reliably.

  In particular, in the chair of this embodiment, the warp allowing portion 140 of the seat plate 113 is intermittently formed on the general surface between the plurality of reinforcing ribs 23 extending in the front-rear direction and the adjacent reinforcing ribs 23, 23. Are provided with a plurality of lightening holes 50... When the seated person's load acts on the rear side region of the seat plate 113 with respect to the engagement groove 19. The warp deformation in the left-right direction can be promoted without causing large bending deformation in the front-rear direction. Therefore, in the chair of this embodiment, the seating stability of the seat can be further increased.

FIGS. 14 and 15 are a bottom view and a cross-sectional view of the seat plate 113 portion of the seat body 204 showing the third embodiment.
The basic structure of the chair of this embodiment is the same as that of the chair of the second embodiment, but the number and positions of the lightening holes 50 ..., 50A formed in the seat body 204 are the same as those of the second embodiment. It is slightly different from the one.
That is, in the seat body 104 of the second embodiment, the lightening holes 50 are formed only between the reinforcing ribs 23 and 23 adjacent to the left and right inclined regions 113b in the rear region of the engagement groove 19 of the seat plate 113. However, the seat body 204 of the third embodiment has a general surface between the adjacent reinforcing ribs 23, 23 in the left and right inclined regions 213b in the rear region with respect to the engaging groove 19 of the seat plate 213. A plurality of lightening holes 50 are formed, and a plurality of lightening holes 50 </ b> A are also formed in the left and right parts of the central region 213 a. A part of the hollow holes 50A ... provided in the central region 213a is disposed between the adjacent reinforcing ribs 23 and 23 in a portion where the reinforcing ribs 23 exist, but most of the remainder is the presence of the reinforcing ribs 23. It is placed in the area that does not.
The hollowing hole 50A in the central region 213a is formed in a long hole shape like the hollowing hole 50 in the inclined region 213b, but the hole width is narrower than the hole width of the hollowing hole 50 in the inclined region 213b. Is set. Further, the plurality of lightening holes 50A in the central region 213a are intermittently arranged along the front-rear direction in the same manner as the lightening holes 50 in the inclined region 213b.

  The chair according to the third embodiment can obtain the same basic effects as those of the second embodiment, but a plurality of lightening holes 50 </ b> A are formed so as to straddle part of the central region 213 a of the seat plate 213. Therefore, the warp deformation of the warp allowance portion 240 when the seated person sits on the seat body 204 can be made more reliable and natural.

In addition, this invention is not limited to said embodiment, A various design change is possible in the range which does not deviate from the summary. For example, in each of the above embodiments, by forming a plurality of lightening holes in the warp allowance portion of the rear edge portion of the seat plate, the warp allowance portion has a structure that is easily deformed in the surface direction. The warpage allowance portion can be easily deformed in the surface direction of the warpage allowance portion by partially reducing the thickness of the seat plate or lowering the height of the reinforcing rib.
Further, in the case where a hole is formed in the seat plate as in each of the above-described embodiments, the ease of bending (flexibility), strength, etc. In view of the balance, it can be selected as appropriate. Further, in the above embodiment, the engaging grooves that open inward in the left-right direction are formed on both edges of the seat plate. However, the engaging grooves are open in the left-right direction on both edges of the seat plate. A joint groove may be formed. Further, the engaging groove may be provided on the seat receiving member side.

DESCRIPTION OF SYMBOLS 1 Chair 2 Leg part 4 Seat body 5 Seat receiving member 13 Seat plate 19 Engaging groove (supported part)
24 Boss part (Displacement restriction part)
25 Locking flange (displacement restricting part)
29 Outward flange (projection, restraint support)
34 Small flange (downward displacement restriction surface)
40 Warpage Allowable Portion 50 Meat Removal Hole 104 Seat Body 113 Seat Plate 140 Warpage Allowable Portion 204 Seat Body 213 Seat Plate 240 Warpage Allowable Portion

Claims (8)

In the chair in which the seat plate constituting the skeleton part of the seat body is supported by the leg part via the seat receiving member,
The seat receiving member is provided with a restraining support portion that supports left and right side edge portions of the seat plate by restricting displacement in the vertical direction,
The left and right side edges of the seat plate are provided with supported parts supported by the restraint support part,
In the region behind the engaging portion between the restraining support portion and the supported portion at the left and right side edge portions of the seat plate, the upper displacement of the side receiving portion is not restricted by the seat receiving member. A chair characterized by being provided with a warp allowing portion that is allowed to be warped and deformed.   2. A displacement restricting portion for restricting a vertical displacement with respect to the seat receiving member is provided in a substantially intermediate region between the warp permitting portions on both the left and right sides of the seat plate. The listed chair.   The lower seat of the seat receiving member is provided with a lower displacement restricting surface disposed so as to be able to come into contact with the lower surface of the rear side region with respect to the supported portion of the seat plate. The listed chair.   One of the restraint support part and the supported part is configured by an engagement groove extending along the front-rear direction and opening in either the left or right direction, and the other of the restraint support part and the supported part is the The chair according to any one of claims 1 to 3, wherein the chair is constituted by a protrusion engaged with the engagement groove.   The engagement groove and the protrusion are configured to be slidable in the front-rear direction, and the seat plate can be adjusted in the front-rear direction with respect to the seat receiving member via the engagement groove and the protrusion. The chair according to claim 4, wherein the chair is provided.   The chair according to any one of claims 1 to 5, wherein the warp allowing portion of the seat plate is provided with a bending promotion structure that facilitates bending deformation in a surface direction.   The chair according to claim 6, wherein the bending promoting structure is a structure having directivity that lowers the bending rigidity in the left-right direction while maintaining the rigidity in the front-rear direction of the seat plate.   The bending promoting structure includes a plurality of reinforcing ribs provided along the front-rear direction in the seat plate, and a plurality of lightening holes provided intermittently on a general surface between adjacent reinforcing ribs of the seat plate, The chair according to claim 7, comprising:

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