JP5529502B2 - Chair - Google Patents

Description

  The present invention relates to a chair, particularly 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.

  As a chair of this type, for the purpose of strongly pressing the vicinity of the lumbar part of the seated person, a chair that is formed in a substantially square shape in a side view is proposed so that the entire backrest is convex toward the seated person side. (For example, refer to Patent Documents 1 and 2.) In these chairs, the lumbar support is configured to move up and down along the shape of the backrest.

Japanese Patent No. 4036427 Japanese Patent No. 4036428

  However, as described in Patent Documents 1 and 2, when the lumbar support moves up and down along the dog-legged backrest, May move rearward and away from the seated person, making it impossible to effectively press the vicinity of the seated person's lumbar portion.

  The present invention has been made in view of the above problems, and when the lumbar support is in the raised position in the backrest in which the middle part in the vertical direction of the back plate is bent so as to protrude forward. Another object of the present invention is to provide a chair that can effectively press the vicinity of the lumbar portion of a seated person without the lumbar support moving backward.

According to the present invention, the above problem is solved as follows.
(1) In a chair equipped with a lumbar support that presses the waist of a seated person on the front surface of the back plate so that the vertical position can be adjusted, the back plate of the chair is projected in the vertical direction in the side view. A mounting portion for supporting the lumbar support body that presses the lumbar support of the seated person in the lumbar support and attaching to the back plate. The lumbar support body is provided below the lumbar support body, and the attachment portion can be adjusted in the vertical position along the lower straight portion of the back plate , so that the lumbar support body is in the raised position rather than the lowered position. so as to separate the front larger than the front surface of the back plate, further, the protrusion facing the rear right and left of the mounting portion is provided, the protrusion, provided on each side of the front portion of the back plate The groove facing the vertical direction to fit the slidable vertically.

With such a configuration, when the lumbar support is in the raised position, the mounting portion in the lumbar support is located below the lumbar support body, so the lumbar support body is located in front of the bent portion of the back plate, The vicinity of the seated person's lumbar part can be effectively pressed, and the lumbar support effect can be enhanced.
In addition, when the lumbar support is in the lowered position, the lumbar support main body can be positioned backward from the front end of the bent portion on the front surface of the back plate, and can be in a retracted position that does not contact the seated person. It can be stored so as not to disturb the seated person.
Furthermore, when a seated person falls into the lumbar support, the center part in the left-right direction of the lumbar support body is elastically bent backward, and the left and right projecting pieces try to expand from side to side toward the rear, Since the outer surface of each protruding piece is pressed against the outer edge of the groove, the lumbar support is less likely to be displaced in the vertical direction.

(2) In the above item (1), extending portions extending outward are provided on both side portions of the lumbar support body, and mounting portions are provided on the outer ends of both extending portions.

  With such a configuration, the lumbar support main body can be stably and reliably supported by the left and right mounting portions that are largely separated in the left-right direction.

In (3) above (2) section and the outer surface of the collision member, it to one of the outer edge of the concave groove you face, provided side by side a plurality of projections or recesses in the vertical direction, similarly to the other The concave portions or convex portions that selectively elastically engage with the plurality of convex portions or concave portions are provided.

  With such a configuration, when a seated person falls on the lumbar support, the center portion in the left-right direction of the lumbar support main body elastically bends backward, and the left and right projecting pieces expand to the left and right toward the rear. Since the outer surface of each projecting piece at that time is pressed against the outer edge of the concave groove, the engagement strength between the concave portion and the convex portion is increased, and the lumbar support is not easily displaced in the vertical direction.

(4) In the above item (2) or (3), the left and right attachment portions of the lumbar support are provided with operation portions that protrude outward from the back plate.

  With such a configuration, the operating portion can be brought close to the mounting portion of the lumbar support, and the vertical position adjustment of the lumbar support can be easily performed by moving the operating portion up and down with light force.

(5) In any one of the above items (1) to (4), a cushion body is disposed on the front surface of the back plate, and a lumbar support is disposed between the back plate and the cushion body.

  With such a configuration, it is possible to eliminate the step difference at the boundary portion between the back plate and the lumbar support and to make the seating feeling comfortable.

  According to the present invention, in a chair having a backrest that is bent so that the middle part in the vertical direction of the back plate protrudes forward, when the lumbar support is in the raised position, the lumbar support does not retreat, It is possible to provide a chair that can effectively press the vicinity of a seated person's lumbar portion.

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. It is a center longitudinal cross-sectional side view of the backrest which shows when the lumbar support is in the raised position by a solid line and when it is in the lowered position by a two-dot chain line.

  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 ridges 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 so that the upper half portion 15a has a large flexibility 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 portion 15b of the back plate 15, and the front cover plate 18 having the same front surface as the lower half portion 15b of the back plate 15 and part of the back plate 15 is formed. With the rear surface covered with the front half of the upper half 15a of the back plate 15 so as to be aligned with the back plate 15, the back support rods 11 and 11 support the back plate.

Also, as shown in FIGS. 4 and 5, lumbar support support portions 19 are provided on both sides of the front cover plate 18.
The lumbar support support portion 19 has a pair of left and right protruding pieces 27 provided on both side portions of the lumbar support 8 which will be described later and fitted to be slidable in the vertical direction. The pair of concave grooves 20 protrudes rearward from the peripheral edge of each concave groove 20 and is elastically engaged with the side surfaces of the projecting pieces fitted into the concave grooves 20 so as to resist the vertical movement of the projecting pieces. It is provided with a vertically long cylindrical protruding edge 21 that 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 front surface of the upper half portion 15a of the back plate 15 and the front surface of the front cover plate 18 form a back plate front surface that bends so that an intermediate portion in the vertical direction protrudes forward in a side view. A portion below the bent portion of the intermediate portion in the vertical direction is formed by the front cover plate 18 in a straight line shape facing the rear lower portion.

  The lumbar support 8 includes a lumbar support main body (hereinafter simply referred to as a main body) 25 that presses the waist of the seated person, and an extension portion 26 that extends outward from the left and right ends of the main body 25. And a mounting portion 28 that is provided at the front end of each extending portion 26 and has a vertically long projecting piece 27 that faces rearward, is positioned below the main body 25, supports the main body 25, and is attached to the back plate 15. And an operating portion 29 that is connected to the outer end of each mounting portion 28, passes through the front side of the side rod 14, and slightly protrudes outward from the backrest 6.

  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 strips 22. be able to.

  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.

  Moreover, the operation part 29 of the lumbar support 8 is arrange | positioned in the position away from the front cover board 18 to the side, and protrudes slightly also back (refer 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 protruding piece 27 of the lumbar support 8 is inserted into the recessed groove 20 of the front cover plate 18, the protruding portion 31 a is in contact with the inwardly protruding portion between the recessed strips 22. The elastic tongue 31 is elastically deformed so as to be pushed inward by the inward protruding portion and the elastic tongue 31 is pushed inward of the protrusion 27.

  From this state, by slightly moving the lumbar support 8 up and down, the convex portion 31 a of the projecting piece 27 is inserted into the concave groove 22 closest to the concave groove 20. Thereby, the position of the lumbar support 8 is held at that position with a relatively strong engagement force. In order for the seated person to adjust the vertical position of the lumbar support 8, this can be done simply by moving the operation portion 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, since 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, a support member is provided separately from the front cover plate 18. Therefore, the lumbar support 8 can be reliably supported with a simple configuration. Therefore, an increase in cost can be suppressed. Further, in order to support the lumbar support 8, the area of the front surface of the front cover plate 18 can be increased.

  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.

  By operating the operating portion 29, the lumbar support 8 is raised to a raised position where the main body 25 is located in front of (or slightly above or below) the bent portion on the front surface of the back plate, as shown by a solid line in FIG. At that time, the attachment portion 28 is still located at the straight portion below the bent portion on the front surface of the back plate, that is, the straight portion of the front cover plate 18, and only the main body 25 is forward of the bent portion on the front surface of the back plate. Separate.

  On the other hand, when the operation unit 29 is operated and the lumbar support 8 is lowered to the lowered position where the main body 25 is located at the lower straight portion of the front surface of the back plate as shown by a two-dot chain line in FIG. 25 is located behind the front end of the bent portion on the front surface of the back plate and can be set to a retracted position that does not contact the seated person. In this state, the seat 25 can be accommodated so as not to disturb the seated person. it can.

  That is, the horizontal distance from the attachment portion 28 to the main body 25 in the lumbar support 8 does not change, but when the attachment portion 28 moves to the upper part of the lumbar support support portion 19, the main body 25 is bent at the front of the back plate. Since the main body 25 protrudes forward from the front portion of the back plate, the amount of protrusion of the main body 25 toward the front is larger at the raised position than at the lowered position.

  Further, when a seated person falls on the lumbar support 8, the central part in the left-right direction of the main body 25 is elastically bent backward, and the left and right projecting pieces 27, 27 try to expand from side to side toward the rear, Since the outer surface of each protrusion 27 at that time is pressed against the outer edge of the groove 20, the engagement strength between the protrusion 31a and the groove 22 is increased, and the lumbar support 8 is not easily displaced in the vertical direction. Become.

The present invention is not limited only to the above-described embodiments, and can be implemented in various modified modes as follows, for example, without departing from the scope of the claims.
(1) The back plate 15 upper half portion 15a and the front cover plate 18 are integrated into a single back plate, and the backrest support rod 11 is fixed to the rear surface, and the rear side is the rear cover plate. Cover with (not shown).
(2) A plurality of convex portions 31 a are provided on the inner surface of the outer side wall of the projecting edge 21, and a concave strip 22 (concave portion) adapted to be elastically engaged therewith is provided on the elastic tongue 31 of the projecting piece 27.

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)

In a chair equipped with a lumbar support that presses the waist of the seated person on the front of the back plate so that the vertical position can be adjusted,
The back plate is bent so that an intermediate portion in the vertical direction protrudes forward in a side view, and a portion below the bent portion is formed in a straight line facing the rear lower portion, and a seated person in the lumbar support The lumbar support body that supports the lumbar support body that presses the lower back of the lumbar support body is attached below the lumbar support body, and the attachment part can be vertically adjusted along the lower straight portion of the back plate . Thus, the lumbar support main body is spaced farther forward than the front surface of the back plate in the raised position than in the lowered position , and the left and right mounting portions are provided with rearward projecting pieces. A chair characterized in that a piece is fitted so as to be slidable in a vertical direction in a concave groove provided on both sides of the front surface of the back plate .   The chair according to claim 1, wherein an extension portion extending outward is provided on both side portions of the lumbar support main body, and an attachment portion is provided on an outer end of each extension portion. The outer surface of the collision member, it to one of the outer edge of the concave groove you face, provided side by side a plurality of projections or recesses in the vertical direction, similarly to the other, selection of the plurality of projections or recesses The chair according to claim 2, further comprising a concave portion or a convex portion that are elastically engaged with each other.   The chair according to claim 2 or 3, wherein the left and right attachment portions of the lumbar support are provided with operation portions that protrude outward from the back plate.   The chair according to any one of claims 1 to 4, wherein a cushion body is disposed on a front surface of the back plate, and a lumbar support is disposed between the back plate and the cushion body.

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