JP4491319B2 - Chair backrest device - Google Patents

Description

  The present invention relates to a chair backrest device to which a lumbar support is attached.

  2. Description of the Related Art Conventionally, as a chair with a lumbar support attached to a backrest of a chair, for example, Patent Document 1 and Patent Document 2 related to the applicant of the present application are known.

Japanese National Patent Publication No. 8-507935 JP 2004-49656 A

  However, in the backrest device described in Patent Documents 1 and 2, a lumbar support having a relatively high rigidity is disposed on the rear side of the skin material of the backrest, and the lumbar support is attached to the rail of the support portion. It is a structure which moves up and down along. Therefore, the load applied to the back frame through the lumbar support support part varies greatly depending on the vertical position of the lumbar support, so it is necessary to make the back frame strong enough to withstand the maximum load. There is a problem that the cost becomes complicated and the cost becomes high. Furthermore, since the structure has a structure in which the lumbar support having high rigidity and a relatively large size is moved up and down, there are cases where it is difficult for the elderly and the sick to easily perform the operation.

  The present invention has been made in view of the above problems, and even when the vertical position of the back support portion of the lumbar support is adjusted, the load on the back frame or the like does not substantially change, and the back It is an object of the present invention to provide a backrest device for a chair that can move the support portion up and down with a small force and can be easily operated by an elderly person or a sick person.

The above-described problems are solved by the invention having the following configuration, as shown in each of the claims.
(1) In a chair backrest device in which a skin material is stretched on the front side of the back frame, a lumbar support is attached to a rigid attachment member attached to the back frame, and a support attached to the attachment member so as to be movable in the vertical direction. A lumbar support is formed by a heel and a soft cover member that covers the front and upper and lower directions of the support ridge and has upper and lower ends fixed to the upper and lower edges of the mounting member so as to face the front. It is provided so as to be located behind the skin material.

(2) A groove is provided at the upper and lower ends of the cover member, a forward projecting piece is provided at the upper and lower ends of the mounting member, and the groove at the upper and lower ends of the cover member is formed at the upper and lower ends of the mounting member. Fit into the protruding piece from the front.

( 3 ) In the above item (1) or (2), either the mounting member or the support rod in the lumbar support is provided with a rail in the vertical direction, and the other is provided with a guide portion for guiding the rail. The rod is movable in the vertical direction with respect to the mounting member, and the support rod can be fixed at a plurality of positions in the vertical direction.

( 4 ) In the above item ( 3 ), the mounting member or the support rod in the lumbar support is provided with a concavo-convex portion that is vertically continuous, and an elastic locking piece that is locked to the concavo-convex portion on the other side. The support rod can be fixed at a plurality of positions in the vertical direction by the engagement between the uneven portion and the elastic locking piece.

( 5 ) In any one of the above items (1) to ( 4 ), a support rod is provided on the front surface of a horizontally long bowl-shaped main body, and a plurality of ribs are arranged in the left-right direction.

( 6 ) In any one of the above items (1) to ( 5 ), a handle for moving the support rod up and down relative to the mounting member is provided on both left and right ends of the support rod.

According to the present invention, the following effects can be obtained.
According to the first aspect of the present invention, since the upper and lower end portions of the cover member are fixed so as to face forward with respect to the mounting member, the width of the cover member and the mounting member in the vertical direction is reduced, and the cover member The amount of protrusion relative to the mounting member can be increased. As a result, the lumbar support can be reduced in size, and the range of movement of the lumbar support can be increased.

In addition, since the load of the human body is individually applied to the mounting member through both the cover member and the support rod, the load is dispersed, and an excessive load is prevented from being concentrated on a specific portion of the back frame. The Therefore, it is not necessary to manufacture the back frame partly firmly, which is advantageous in terms of cost.
Furthermore, since the cover member is fixed and it is only necessary to move the support rod up and down, even an elderly person or a sick person can easily operate with a small force.

According to the second aspect of the present invention, the cover member and the attachment member can be easily fixed without using another fixing means, and the fixing structure can be downsized.

According to the third aspect of the present invention, the support rod can be held stepwise at a desired height position of the seated person.

According to invention of Claim 4 , the height position of a support rod can be adjusted substantially continuously by latching with the uneven | corrugated | grooved part which continues up and down, and an elastic locking piece.

According to the fifth aspect of the present invention, since the support rod is configured by arranging a plurality of ribs on the front surface of the bowl-shaped main body portion in the left-right direction, the support having a soft feeling can be obtained by bending the ribs. As well as a small, lightweight and low-cost support rod.

According to the sixth aspect of the invention, it is possible to easily adjust the height of the support rod behind the backrest.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a front view of a chair provided with the backrest device of the present invention, and FIG. 2 is a side view thereof. The chair includes a leg (3) having five radial rods (2) each having a caster (1) at the tip, and a gas spring (not shown) is provided at the center of the leg (3). A telescopic pedestal (4) provided with a zipper) is erected, and the rear part of the support base (5) is fixed to the upper end of the pedestal (4). On both side surfaces of the front portion of the support base (5), left and right arm portions (5a) are integrally formed.

  The pivot (6) consisting of a hexagonal shaft facing in the left-right direction passes through the center of the support (5) in the front-rear direction, and the left and right supporting the backrest (7) are supported at both ends of the pivot (6). In the pair of backrest support rods (8) and (8), the cylindrical portions (8a) and (8a) facing the left and right formed on the front end portion of the lower portion facing forward are fixedly fitted, and the pivot (6) and the backrest support are supported. The heels (8), (8) and the backrest (7) can rotate with respect to the support base (5) integrally with each other around the pivot (6).

  Short standing arms (8b) and (8b) are projected upward slightly from the pivot (6) of the left and right back support rods (8) and (8), and each standing arm (8b ) (8b) has a pair of seat receiving frames (10) and (10) facing the front and rear supporting both sides of the seat (9) at the upper end of the shaft (11). , Respectively. The backrest (7) has a back frame (12) and a skin material (13) made of a net member or a porous sheet member stretched on the surface of the back frame (12), inside the skin material (13). A lumbar support (R), which will be described later, is provided. An armrest (14) is attached to each back support rod (8).

3 is a front view of the backrest excluding the skin material, FIG. 4 is a sectional end view taken along the line IV-IV of FIG. 1, and FIG. 5 is an exploded sectional view of the main part.
As shown in FIGS. 3 to 5, the lumbar support (R) includes a hard mounting member (15), a support rod (16), and a soft cover member (17).
Here, the hard mounting member (15) may be any member having a load-bearing strength against the load from the seated person, and generally a mounting member formed of a hard synthetic resin or a thick soft synthetic resin. Used.
The soft cover member (17) may be any material that can be deformed by the load from the seated person and the vertical movement of the support rod (16), and is generally a soft synthetic resin plate, synthetic or natural. A rubber plate or the like is used.

  On the front surface of the left and right frames (12A) (12A) in the back frame (12), vertical engaging grooves (18) (18) opening forward are formed. As shown in FIG. 5, the front end (19b) of the inner wall (19a) of the engagement groove (18) is retracted by a distance (L) from the front surface (12a) of the outer wall (19c). On the rear surface of the engaging portion (15a) at both ends of the mounting member (15) in the lumbar support (R), an engaging groove (21) in the vertical direction that opens rearward is provided. The outer wall (20) of the engaging portion (15a) is engaged in the engaging groove (18) of the left and right frames (12A), and the left and right sides of the engaging groove (21a) of the engaging portion (15a) The inner wall (19) of the frame (12A) is engaged.

  When engaging the engaging portion (15a) of the mounting member (15) of the lumbar support (R) with the engaging groove (18) of the left and right frames (12A) (12A), the engaging portion (15a) can be easily engaged by curving a little in a rearward convex shape in plan view, but the left and right frames (12A) and (12A) are rearward on the inner edge from the outer edge in the left and right direction. If it forms so that it may incline, the said engagement will become still easier.

  As shown in FIG. 4, the front surface (15b) of the engaging portion (15a) in the lumbar support (R) is substantially the same surface as the front surface (12a) of the left and right frames (12A) in the back frame (12), or slightly It has a configuration located rearward. The ends of the skin material (13) of the backrest (7) are attached to the slits (12b) formed on the left and right outer end surfaces of the left and right frames (12A) of the back frame (12). The engaging portion (15a) of the mounting member (15) in the lumbar support (R) is in contact with the skin material (13) stretched in front of the left and right frames (12A) in the back frame (12), This prevents the lumbar support (R) from falling off the back frame (12).

6 and 7 are sectional end views taken along lines VI-VI and VII-VII in FIG. 1, respectively.
As shown in FIGS. 4, 6, and 7, a resin engagement member having a shallow uneven portion (22 a) formed continuously in the height direction at the center in the left-right direction on the front surface of the mounting member (15). Stop members (22) are provided, and rail members (23) and (23) facing left and right outwards extending in the height direction are attached to the left and right sides thereof by screws (24) and (24).

  A guide portion (26) guided by a rail member (23) is formed on the rear surface of the support rod (16), and an elastic locking member (27) having a wide U-shape in front view in a plan view is formed in the center. Is provided. At the center of the rear surface of the elastic locking member (27), a locking convex portion (27a) that elastically locks to the concavo-convex portion (22a) is formed. A large number of ribs (28) protrude from the front surface of the left and right ridges (29) provided on the front surface of the support rod (16), and handles ( 30) (30) is provided. The rib (28) bends to provide a cushioning effect and save material, but the front surface of the support rod (16) may be arc-shaped without ribs.

As shown in FIGS. 6 and 7, the upper and lower edges of the mounting member (15), the upper and lower ends of the cover member (17) is mounted to face forward. That is, as shown in FIG. 9, grooves (17a) are provided at the upper and lower ends of the cover member (17), and forward projecting pieces (15c) are provided at the upper and lower ends of the mounting member (15). (17) The upper and lower end portions of the cover member (17) are fitted to the mounting member by fitting the grooves (17a) at the upper and lower end portions to the protruding pieces (15c) on the upper and lower end edges of the mounting member (15) from the front. (15) Installed. A mounting portion (31) is constituted by the protruding piece 15c of the mounting member and the groove (17a) of the cover member (17). This cover member (17) is soft and is slightly spaced from the front surface of the rib (29), and on the rear side of the skin material (13) so as to cover the front and upper and lower sides of the support rod (16). Is provided.

  The lumbar support (R) is attached to the back frame (12) as follows. A skin material (13) is stretched in advance on the back frame (12). Position the engagement part (15a) of the mounting member (15) to which the support rod (16) and the cover member (17) are assembled in front of the back frame (12) while pushing the rear surface of the skin material (13). Then, the engaging portion (15a) of the lumbar support (R) is engaged with the engaging grooves (18) of the left and right frames (12A) of the back frame (12). As a result, as shown in FIG. 4, the front surface of the engaging portion (15a) is pressed backward by the tension of the skin material (13), and the lumbar support (R) is prevented from falling off the back frame (12). The

  Also, as shown in FIG. 3, the left and right frames (12A) and (12A) of the back frame (12) are parallel to each other (12A1) and (12A1), and the left and right direction that continues downward from the lower end. The inwardly inclined portion (12A2) and (12A2) are formed, and the engaging portion (15a) is engaged at two portions of the parallel portion (12A1) and the inclined portion (12A2). Therefore, the vertical movement of the mounting member (15) is prevented by the engagement of the inclined portion (12B). Therefore, the attachment member (15) is securely fixed to the back frame (12) without using fixing means such as screws.

  FIG. 8 shows the operating state of the support rod (16). FIG. 8 (a) shows the state where the support rod (16) is moved to the uppermost position, and FIG. 8 (b) shows the support rod (16). Each of the states is moved to the bottom. The solid line (32) represents the back of the person seated on the seat (9). When moving the support rod (16), hold the handle (30) and move it up and down so that the guide portion (26) of the support rod (16) slides along the rail member (23) and is elastic. The locking projection (27a) of the locking member (27) slides in a state of being in contact with the unevenness (22a) of the locking member (22), and is locked at an arbitrary position of the locking member (22). Held. Thereby, the support rod (16) can be held at a position most suitable for the person who is seated.

The rail member (23) is provided on the support rod (16) and the guide portion (26) is provided on the mounting member (15), or the locking member (22) is elastically locked on the support rod (16). The member (27) may be provided on the attachment member (15).
As described above, by engaging the engaging portions (15a) at both ends of the mounting member (15) of the lumbar support (R) with the engaging grooves (18) on the left and right sides of the back frame (12), It is possible to easily attach the mounting member (15) to the back frame (12) in a short time without using any fixed parts such as, and with the skin material (13) stretched on the back frame (12). it can.

It is a front view of the chair provided with the backrest apparatus of this invention. Similarly, it is a side view. It is a front view which shows one Embodiment of the backrest apparatus of the chair of this invention. FIG. 4 is a cross-sectional end view taken along the line IV-IV in FIG. 3. Similarly, it is an exploded sectional view of a back frame and a mounting member. Similarly, it is a VI-VI line sectional end view of Drawing 3. Similarly, it is the VII-VII line sectional end view of Drawing 3. Similarly, (a) is a cross-sectional end view showing an upper limit position of the support member and (b) is a lower limit position. Similarly, it is an enlarged sectional view showing a fastening structure of an attachment member and a cover member.

(1) Casters
(2) Legs
(3) Leg
(4) pedestal
(5) Support base
(5a) Arm
(6) Axis
(7) Backrest
(8) Support rod
(8a) Tube part
(8b) Standing arm
(9) Seat
(10) Seat support frame
(11) axis
(12) Back frame
(12a) Front
(12b) Slit
(12A) Left and right frames
(12A1) Parallel part
(12A2) Inclined part
(13) Skin material
(14) Armrest
(15) Mounting member
(15a) Engagement part
(15b) Front
(15c) Projection
(16) Support 杆
(17) Cover member
(17a) Groove
(18) Engagement groove
(19a) Inner wall
(19b) Front edge
(19c) Exterior wall
(20) Exterior wall
(21) Engaging groove
(22) Locking member
(22a) Concavity and convexity
(23) Rail member
(24) Screw
(26) Guide section
(27) Elastic locking member
(27a) Elastic locking member
(28) Rib
(29) Projections
(30) Handle
(31) Mounting part
(32) Solid line

Claims (6)

In a chair backrest device in which a skin material is stretched on the front side of the back frame, a lumbar support, a rigid mounting member attached to the back frame, and a support rod attached to the mounting member so as to be movable in the vertical direction, A soft cover member covering the front and upper and lower directions of the support rod and having upper and lower ends fixed to the upper and lower edges of the mounting member so as to face the front , and a lumbar support as the skin material A backrest device for a chair, wherein the backrest device is provided so as to be positioned on the rear side. Grooves are provided at the upper and lower ends of the cover member, forward protrusions are provided at the upper and lower ends of the attachment member, and grooves at the upper and lower ends of the cover member are formed at the upper and lower ends of the attachment member. The chair backrest device according to claim 1, wherein the backrest device is fitted from the front. Either one of the mounting member or the support rod in the lumbar support is provided with a rail in the vertical direction, and the other is provided with a guide portion for guiding the rail, so that the support rod can be moved in the vertical direction with respect to the mounting member. The backrest device for a chair according to claim 1 or 2, wherein the support rod can be fixed at a plurality of positions in the vertical direction. Either one of the mounting member or the support rod in the lumbar support is provided with a concavo-convex portion that is continuous in the vertical direction, and an elastic locking piece that is locked to the concavo-convex portion is provided on the other side. 4. The chair backrest device according to claim 3 , wherein the support rod can be fixed at a plurality of positions in the vertical direction by locking. The backrest device for a chair according to any one of claims 1 to 4 , wherein the support rod is formed by arranging a plurality of ribs in the left-right direction on the front surface of the horizontally long bowl-shaped main body. The chair backrest device according to any one of claims 1 to 5 , wherein a handle for moving the support rod up and down with respect to the mounting member is provided at both left and right ends of the support rod.

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