JP5529501B2 - Chair - Google Patents

Description

  The present invention relates to a chair, and more particularly to a chair provided with a lumbar support on the backrest.

  In recent years, as a chair used in offices, etc., a lumbar support that presses a predetermined range in the vertical direction near the waist of the seated person, specifically, near the lumbar vertebrae, is provided to enable sitting for a long time. Many have been proposed.

  In this type of conventional chair, a lumbar support is attached to both sides of the back plate so that the height can be adjusted (see, for example, Patent Document 1), and a lumbar support mounting member is attached to the rear surface of the back frame. A lumbar support is attached (for example, see Patent Document 2), and a lumbar support is attached to a back frame that supports the backrest (for example, see Patent Document 3).

JP 2001-128787 A JP 2006-280416 A Japanese Patent No. 4183079

  However, what is described in Patent Document 1 has to be processed for mounting the lumbar support on the large-sized back plate itself, and the work is troublesome. Since the lumbar support attaching member must be attached to the rear surface of the back frame, the number of parts increases and the attaching operation becomes complicated. There are problems such as small area and unstable support of the backrest.

  In view of the above-mentioned problems of the prior art, the present invention provides a stable and reliable lumbar support with a simple configuration without performing special processing on the back plate itself or attaching separate parts. The purpose of the present invention is to provide a chair that can be supported and can suppress an increase in cost.

According to the present invention, the above problem is solved as follows.
(1) to the bottom front of the back plate, and recessed rearwardly, and a recess opening downward, in the recess, fixed fitted to the top of the backrest support rod raised from the rear seat, the Lumber support support portions that support both sides of the lumbar support on both sides of the front cover plate that is attached to the back plate so as to cover the upper portion of the back support rod fitted into the recess and the lower front surface of the back plate. Is provided.

  With such a configuration, the lumbar support support portion may be provided on the front cover plate having a small size without performing special processing on the large-size back plate itself or attaching separate parts. It is easy and the structure can be simplified, and not only the cost can be reduced, but also the lumbar support can be stably and reliably supported on both sides of the front cover plate.

In addition, the backrest support ridge and the lower portion of the back plate can be firmly coupled, and the backrest can be made thinner by reducing the distance between the lower portion of the back plate and the front cover plate.

(2) In the above item (1) , a rib facing forward is provided in a portion of the concave portion of the back plate excluding the back support rod, and the front cover plate is brought into contact with the front end of the rib.

  With such a configuration, the rib can not only increase the strength of the lower portion of the back plate, but also increase the support strength of the front cover plate.

(3) The lower front surface of the back plate is fixed to the upper portion of the back support rod that stands up from the back of the seat, and the upper portion of the back support rod and the lower front surface of the back plate are covered with the back plate. A lumbar support support portion for supporting both side portions of the lumbar support is provided on both side portions of the attached front cover plate , and the lower half of the back plate is recessed rearward in a step shape, and both side portions of the back plate are provided. In addition, a pair of left and right side rods whose thickness in the front-rear direction is larger than the thickness of the back plate are connected so as to protrude forward from the lower half of the back plate, A lumbar support supporting portion provided so as to protrude rearward on both side portions of the front cover plate is accommodated in a recess formed by the half portion .

With such a configuration, not only can the strength of the lower half of the back plate be increased, but the lumbar support support portion can be housed in the back plate in good appearance without protruding forward.
Further, the same effect as described in paragraph 0008 can be obtained.

(4) The lower front surface of the back plate is fixed to the upper portion of the back support rod that stands up from the back of the seat, and the upper portion of the back support rod and the lower front surface of the back plate are covered with the back plate. A lumbar support support part for supporting both sides of the lumbar support is provided on both sides of the attached front cover plate, and the lumbar support support part is provided with a pair of left and right projections facing the rear provided on both sides of the lumbar support. A pair of left and right concave grooves that are vertically fitted to be slidable in the vertical direction, and projecting rearward from the side edge of each concave groove, on the side surface of the protruding piece fitted in the concave groove And a protruding edge that elastically engages and applies resistance to the vertical movement of the protruding piece .

With such a configuration, the lumbar support can be stably adjusted in height with a simple structure, and the support portion of the lumbar support is not exposed to the outside, and the appearance is good.
Further, the same effect as described in paragraph 0008 can be obtained.

(5) In the above item (4) , either one of the opposing surfaces of the projecting piece and the projecting edge can be elastically deformed, a convex portion is provided on one of the opposing surfaces, and the convex portion is provided on the other. And a plurality of convex portions or concave portions provided on the protruding edge side.

  With such a configuration, it is possible to give a sense of moderation to the height adjustment of the lumbar support with a simple structure. That is, the lumbar support can be stably held at a plurality of positions in the vertical direction.

  According to the present invention, the lumbar support can be stably and reliably supported with a simple configuration without any special processing or attaching a separate part to the back plate itself, and the increase in cost can be suppressed. It is possible to provide such a chair.

It is a side view of one Embodiment of the chair of this invention. It is a back view similarly. It is also a plan view. It is the disassembled perspective view which looked at the backrest from diagonally forward. It is the vertical side view which looked at the front cover board and back board of FIG. 4 from the VV line. It is a front view of only a front cover board. It is the perspective view which looked at the lumbar support from diagonally backward. It is the perspective view which looked at the attaching part of the lumbar support from diagonally backward. FIG. 9 is an enlarged cross-sectional plan view taken along line IX-IX in FIG. 8. It is the front view which looked at the state which attached the lumbar support to the front cover board from the front. It is the perspective view which looked at the backrest equipped with the lumbar support from diagonally backward.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

  As shown in FIGS. 1 to 3, the chair includes a leg body 3 having five leg rods 2 having a radial shape with a caster 1 at the tip. In the center of the leg 3, a telescopic leg column 4 having a gas spring (not shown) is erected, and the rear part of the support base 5 is fixed to the upper end of the leg column 4.

  The support base 5 has a substantially hollow box shape with an upper surface opened, and the opening on the upper surface is covered with a removable cover 5a.

  Inside the support base 5 is a biasing means for biasing the backrest 6 in the standing direction, that is, forward, and a biasing means for biasing the seat 7 supported by the support base 5 forward ( Although neither of them is shown), armrests 7a and the like provided on both sides of the seat 7 are provided, but these are not directly related to the present invention, and thus illustration and detailed description thereof are omitted.

  As shown in FIGS. 1 and 2, a lumbar support 8 described later is provided inside the backrest 6. Moreover, as shown in FIGS. 1-3, the hanger 9 for hanging clothes is provided in the back surface of the backrest 6. As shown in FIG. Since the hanger 9 is not directly related to the present invention, detailed description is omitted.

As shown in FIG. 4, the backrest 6 is supported by a pair of left and right backrest support rods 11, 11 that are L-shaped in a side view and are connected by a connecting plate 10 in which intermediate bent portions face in the left-right direction. Yes.
As shown in FIG. 1, the front end portions of the backrest support rods 11, 11 are pivotally attached to the support base 5 with a horizontal axis 12, and the front and rear ends are connected to the rear end portion of the support base 5 and the connecting plate 10. The backrest support rods 11 and 11 and the backrest 6 are rotated about the shaft 12 in the front-rear direction or stopped at a desired rearward tilt angle by the action of the gas spring 13 to which the portions are connected. It has come to be able to do.

  As shown in FIG. 4, the backrest 6 connects the pair of left and right side scissors 14, 14 and the both side scissors 14, 14, and the thickness in the front-rear direction is the same as the thickness in the front-rear direction of the both side scissors 14, 14. A smaller back plate 15 is provided.

The upper half portion 15a of the back plate 15 is joined to the front edge of the both side collars 14, 14, and the lower half portion 15b is joined to the rear edge of the both side collars 14, 14, with a horizontal step between them. A portion (not shown) is formed.
Accordingly, the left and right side hooks 14 and 14 protrude forward from the lower half 15b of the back plate 15, and the both side hooks 14 and 14 and the lower half 15b of the back plate 15 form a recess 15c.
It is preferable that the both side collars 14 and 14 and the back plate 15 are integrally formed of a hard synthetic resin material having elasticity.

  In this way, the backrest 6 is connected to the pair of left and right side scissors 14, 14 and the side scissors 14, 14, and the thickness in the front-rear direction is smaller than the thickness in the front-rear direction of the side scissors 14, 14. Since the back plate 15 is provided, the right and left side plates 14 and 14 and the back plate 15 can be integrally formed of the same material without lowering the strength of both sides of the backrest 6. The upper portion of the back plate 15 can be flexible.

The upper half 15a of the back plate 15 is provided with a number of long holes 16 that are long in the vertical direction in order to increase flexibility.
A large number of ribs 17 are provided on both sides of the front surface of the lower half 15b of the back plate 15 to increase rigidity.

  That is, the back plate 15 is formed such that the upper half portion 15a is highly flexible and the lower half portion 15b has higher rigidity and strength than the upper half portion 15a. Thereby, the force acting on the front cover plate 18 described later and the lumbar support 8 attached to the front cover plate 18 can be reliably supported by the lower half portion 15b of the back plate 15.

  The backrest 6 is an attachment member in which the upper end portions of the left and right backrest support rods 11 and 11 are inserted from the lower side between the left and right ribs 17 and 17 on the front surface of the lower half portion 15b of the backplate 15 and the illustration is omitted. Then, the connecting plate 10 is fixed to the lower half 15b of the back plate 15, and the front surface thereof has a front cover plate 18 which is substantially the same shape as the lower half 15b of the back plate 15, and the rear surface is above the back plate 15. It is supported by the backrest support rods 11 and 11 in a state of being covered so as to be aligned with the front surface of the half portion 15a.

Also, as shown in FIGS. 4 and 5, lumbar support support portions 19 are provided on both sides of the front cover plate 18.
This lumbar support support portion 19 has a pair of left and right projections 27 which are provided on both side portions of the lumbar support 8 described later and which are fitted with a pair of left and right protruding pieces 27 slidable in the vertical direction. The groove 20 protrudes rearward from the peripheral edge of each groove 20 and is elastically engaged with the side surface of the protrusion fitted into the groove 20 to provide resistance to the vertical movement of the protrusion. A vertically long cylindrical protruding edge 21 is provided.

The outer side wall portion of the projecting edge 21 is formed in a corrugated plate shape in which a plurality of concave strips (concave portions) 22 facing in the front-rear direction are continuous in the vertical direction.
When the front cover plate 18 is attached to the back plate 15, the protruding edges 21 are accommodated on both sides of the recess 15 c of the back plate 15.

As shown in FIGS. 4 and 5, four fitting pins 23 projecting rearward are provided at the four corners of the rear surface of the front cover plate 18.
The front cover plate is formed by fitting each fitting pin 23 into a fitting hole 24 provided in the front surface of the boss portion 17a disposed at the intersection of the ribs 17 on the front surface of the lower half portion 15b of the back plate 15. 18 is securely attached to the lower front surface of the back plate 15.

  The lumbar support 8 includes a lumbar support main body (hereinafter simply referred to as a main body) 25 whose front shape is an oblong shape, an extension portion 26 that extends outward from the left and right ends of the main body 25, and a tip of each extension portion 26. Are attached to the outer ends of the mounting portions 28 and pass through the front side of the side cage 14 and slightly outward to the backrest 6. And an operation portion 29 protruding to the right.

  As shown in FIG. 7, the main body 25 has an arc shape in which the central portion is recessed backward with a large radius of curvature in a plan view, and an arc shape in which the central portion projects forward with a small radius of curvature in a side view. There is no.

  At the center and both sides of the rear surface of the main body 25, large rearward projecting pieces 25a having a substantially triangular shape in side view and small rearward projecting pieces 25b, 25b having a substantially semicircular shape in side view project. The main body 25 can be prevented from elastically deforming rearward excessively by abutting the rear end thereof against the front surface of the front cover plate 18.

As shown in FIGS. 8 and 9, the projecting piece 27 of the mounting portion 28 has a vertically long cylindrical shape whose rear end is open, and a plurality of cut grooves 30 are provided on the outer side wall portion from the rear end. The upper and lower elastic tongue pieces 31, 31 are cut out, and the shallow spherical convex portions 31 a provided on the outer surface of the rear end portion of each elastic tongue piece 31 are selected as the plurality of concave stripes 22 on the protruding edge 21. By elastically engaging with each other, resistance is given to the vertical movement of the projecting piece 27, and the lumbar support 8 is stably held at a plurality of vertical positions along the front surface of the front cover plate 18. I can do it.
Further, when adjusting the height of the lumbar support 8 by moving the left and right operation portions 29 and 29 up and down, a sense of moderation is imparted by elastically engaging each convex portion 31a and the plurality of concave stripes 22. Can do.

  When the lumbar support 8 is attached to the front cover plate 18, the lumbar support 8 is brought closer to the front cover plate 18 from the front as shown in FIG. Then, as shown in FIG. 10, the protruding piece 27 at the attachment portion 28 of the lumbar support 8 is inserted into the concave groove 20 of the front cover plate 18. At this time, the projecting pieces 25 a and 25 b in the main body 25 of the lumbar support 8 come into contact with the front surface of the front cover plate 18. Thereby, even when the main body 25 of the lumbar support 8 is curved or inclined, the lumbar support 8 is reliably supported by the front cover plate 18.

  Further, the operation portion 29 of the lumbar support 8 is disposed at a position laterally separated from the front cover plate 18 and slightly protrudes rearward (see FIG. 11). As will be described later, the operation portion 29 protrudes outward from the left and right side portions of the backrest 6 and can be operated by a seated person directly.

  When the projecting piece 27 of the lumbar support 8 is inserted into the recessed groove 20 of the front cover plate 18, when the projecting portion 31 a is in contact with the inward projecting portion between the recesses 22, the projecting portion 31 a The elastic tongue piece 31 is elastically deformed so as to be pushed inward by the direction protruding portion and the elastic tongue piece 31 is pushed inward of the protruding piece 27.

  From this state, the lumbar support 8 is slightly moved up and down to insert the projection 31 a of the projecting piece 27 into the nearest groove 22 of the groove 20. Thereby, the position of the lumbar support 8 is held at that position with a relatively strong engagement force. When the seated person adjusts the vertical position of the lumbar support 8, the position can be easily adjusted simply by moving the operation unit 29 up and down.

  As shown in FIG. 10, when the front cover plate 18 is attached to the lower half 15 b of the back plate 15, the concave groove 20 of the front cover plate 18 is formed with a recess 15 c surrounded by the back plate 15 and the side wall 14, and It is accommodated in a space surrounded by the front cover plate 18. Therefore, since there is no other member other than the lumbar support 8 on the front surface of the front cover plate 18, a large area for supporting the lumbar support 8 on the front surface of the front cover plate 18 can be secured. Further, since the front cover plate 18 and the lumbar support 8 can be disposed close to each other, the backrest 6 can be made thinner.

  As shown in FIG. 4, the front surface of the lumbar support 8, the front surface of the front cover plate 18, the front surface of the upper half portion 15a of the back plate 15, and the rear surface of the upper half portion 15a of the back plate 15 are folded in half. Covered by. As shown in FIG. 6, the lower end portion of the cushion material 32 that covers the front surface of the front cover plate 18 is fixed using convex-shaped daruma holes 33 provided at both lower ends of the front cover plate 18.

  FIG. 11 is an external view of the backrest 6 showing a state in which the back plate 15, the front cover plate 18, the lumbar support 8 and the cushion material 32 are assembled. In this state, the back plate 15, the front cover plate 18, and the main body 25 of the lumbar support 8 are covered by the cushion material 32, so that these members are not exposed to the outside, and the appearance can be favorably maintained. . However, since only the operation portion 29 of the lumbar support 8 is exposed to the outside from both sides of the backrest 6, the seated person can directly adjust the vertical position of the lumbar support 8 by directly operating the operation portion 29. .

  According to the chair of the present embodiment, the front cover plate 18 that covers the front surface of the lower half portion 15b of the back plate 15 is also used as a support member for the lumbar support 8. Therefore, a support member is provided separately from the front cover plate 18. The lumbar support 8 can be reliably supported with a simple configuration. Therefore, an increase in cost can be suppressed. Further, a large area on the front surface of the front cover plate 18 can be secured to support the lumbar support 8.

  Further, a recess 15c is formed on the front surface of the lower half 15b of the back plate 15, the upper portion of the back support rod 11 is inserted into the recess 15c, the leg 3 or the seat 7 is connected to the back plate 15, and the leg A connecting portion between the body 3 or the seat 7 and the back plate 15 is covered with a front cover plate 18.

  Further, the concave groove 20 of the front cover plate 18 and the protruding piece 27 of the lumbar support 8 inserted into the concave groove 20 are accommodated in a space surrounded by the concave portion 15 c of the back plate 15 and the front cover plate 8. Therefore, the groove 20 and the protruding piece 27 do not protrude from the front surface side of the front cover plate 18. Therefore, it is possible to secure a large area of the portion that should support the lumbar support 8 of the front cover plate 18. In addition, since the seated person does not directly or indirectly touch the concave groove 20 and the projecting piece 27 in the backrest 6, it is possible to suppress a sense of discomfort.

1 Casters 2 Legs 3 Legs 4 Legs 5 Supports 5a Cover 6 Backrest 7 Seat 7a Armrest 8 Lumbar Support 9 Hanger 10 Connecting Plate 11 Backrest Support Rod 12 Shaft 13 Gas Spring 14 Side Rod 15 Back Plate 15a Upper Half Part 15b lower half part 15c concave part 16 long hole 17 rib 17a boss 18 front cover plate 19 lumbar support support part 20 concave groove 21 projecting edge 22 concave line (concave part)
23 fitting pin 24 fitting hole 25 lumbar support main body 25a, 25b projecting piece 26 extending part 27 projecting piece 28 attaching part 29 operating part 30 cutting groove 31 elastic tongue piece 31a convex part 32 cushion material 33 daruma hole

Claims (5)

A concave part that is recessed backward and opens downward is provided in the lower front surface of the back plate, and the upper part of the backrest support ridge standing from the rear of the seat is fitted and fixed to the concave part, and is fitted into the concave part. Lumber support support portions that support both side portions of the lumbar support are provided on both sides of the front cover plate that is attached to the back plate so as to cover the upper portion of the combined back support rod and the lower front surface of the back plate. A chair characterized by that. The portion excluding the backrest support rod in a recess of the back plate is provided with a rib facing forward, the front end of the rib, claim 1 chair according obtained by abutting the front cover plate. A front surface attached to the back plate so that the lower front surface of the back plate is fixed to the upper portion of the back support rod that stands up from the back of the seat and covers the upper portion of the back support rod and the lower front surface of the back plate. A lumbar support support part for supporting both sides of the lumbar support is provided on both sides of the cover plate, and the lower half of the back plate is recessed in a stepped manner on the rear side, and on both sides of the back plate, A pair of left and right side rods whose thickness in the direction is larger than the thickness of the back plate are arranged so as to protrude forward from the lower half of the back plate, A lumbar support supporting portion provided so as to protrude rearward on both side portions of the front cover plate is accommodated in the recess formed by the above . A front surface attached to the back plate so that the lower front surface of the back plate is fixed to the upper portion of the back support rod that stands up from the back of the seat and covers the upper portion of the back support rod and the lower front surface of the back plate. A lumbar support support part for supporting both sides of the lumbar support is provided on both sides of the cover plate, and the lumbar support support part is provided with a pair of left and right protrusions facing the rear provided on both sides of the lumbar support. A pair of left and right concave grooves that are vertically slidably fitted so as to be slidable in the direction, and projecting rearward from the side edges of each concave groove, and elastically engaging the side surface of the protruding piece fitted in the concave groove And a projecting edge adapted to provide resistance to the vertical movement of the projecting piece . Either one of the opposing surfaces of the projecting piece and the projecting edge can be elastically deformed, a convex portion is provided on one of the opposing surfaces, and a concave portion that is elastically engaged with the convex portion is provided on the other, The chair according to claim 4, wherein a plurality of convex portions or concave portions provided on the protruding edge side are provided.

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