JP4199965B2 - Chair backrest device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a chair backrest device to which a lumbar support having a novel mechanism is attached.
[0002]
[Prior art]
When attaching the lumbar support to the back frame of the backrest device, conventionally, the left and right ends of the lumbar support are usually attached to the left and right frames of the back frame. However, in this mounting form, when adjusting the vertical position of the lumbar support, the force applied to the left and right of the lumbar support must be made uniform and moved in the vertical direction, which may make it difficult to perform the movement smoothly. there were.
In addition, the lumbar support function that can sufficiently cope with the desired optimal lumbar support function varies depending on the seating posture of the seated person and individual differences.
[0003]
For example, when seated in a tilted position, it is desirable that the lumbar support function also works with a different forward upward angle and force depending on the tilt angle. However, this is not always sufficient with conventional lumbar support. It hasn't been done yet.
[0004]
[Problems to be solved by the invention]
In view of the above situation, the present invention enables easy operation when adjusting the vertical position of the lumbar support, and when the seated person has a small backward tilt, The purpose of this invention is to provide a chair backrest device that gently supports the back and back, and when the lumbar support function becomes necessary when the rearward tilt increases to some extent, the function works moderately. To do.
Further, as a preferred embodiment, a chair that can perform the lumbar support function at a different desired forward upward angle and magnitude of force according to the back tilt angle of the back and waist that abuts the lumbar support of the seated person. Another object is to provide a backrest device.
[0005]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) In the back frame in which the outer periphery of the sheet-like member is fixed, a lumbar that is slidable along the guide portion is provided at the center of the back frame on the rear surface side of the sheet-like member. A support is provided, and the lumbar support is composed of a lumbar support main body and a cushion member, and the cushion member is formed by attaching the cushion material to the front surface of the base plate substantially the same shape as the cushion material. A through hole is formed, and a concave hole having a diameter larger than that of the through hole is provided at a position relative to the through hole on the rear surface of the cushion material, and both of the through hole and the concave hole are provided in the front surface of the base plate. A mounting hole having a step portion around the periphery of the lumbar support body is formed, and a retaining member is provided at a position corresponding to the mounting hole in the lumbar support main body, and the retaining member is inserted into the through-hole to be removed. By engaging the fit member in the stepped portion of the mounting hole, through the holes, by attaching the cushion member to the lumbar support body constitutes a lumbar support, further to the lumbar support, vertical sliding operation An operation handle is provided to perform the above.
[0006]
( 2 ) In the above item ( 1 ), a locking claw elastically biased outward is provided on the outer peripheral surface of the retaining member, and the locking claw is locked to a step portion in the mounting hole. The cushion member is attached to the lumbar support body.
[0007]
(3) above (1) or (2) have contact to sections of the left and right ends of the operating handle, with is located inward of the back frame, the vertical position of the lumbar support, which can be adjusted .
[0008]
( 4 ) In any one of the above items (1) to ( 3 ), a lumbar support support portion having a free end at the upper end is provided upward from the lower portion of the back frame, and the lumbar support support portion includes the lumbar support support portion. Provide a guide section that faces in the vertical direction.
[0009]
( 5 ) In the above item ( 4 ), a guide portion facing in the vertical direction is provided on the front side of the lumbar support support portion, and the engagement portion provided on the guide portion and the engaged portion provided on the rear surface side of the lumbar support By elastically engaging the part, the vertical position of the lumbar support can be adjusted.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 are a front view and a side view, respectively, of a chair provided with a backrest device according to an embodiment of the present invention.
As shown in FIGS. 1 and 2, the chair (1) has left and right side walls (4a) of a support base (4) fixed to the upper end of a pedestal (3) erected at the center of the leg (2). ) (4a), a pair of left and right backrest support rods (6) and (6) for supporting the backrest (5) are attached, and the support base (4) is mounted via the seat support rods (7a) and (7b). It is formed by attaching a seat (8) above.
[0011]
The left and right back support ridges (6) and (6) have a substantially forward L-shape when viewed from the side, and the cylindrical portions (6a) and (6a) that are provided at the front end and face the left and right sides of the support base (4). The backrest (5) and the backrest support rods (6), (6) are integrated with the support shaft (9). The support shaft (9) protrudes to the left and right from the side walls (4a) (4a). Thus, it can be tilted rearward and downward.
As is well known, the support base (4) is provided with a biasing means for returning the backrest (5) and the backrest support collar (6) tilted backward.
[0012]
The backrest (5) comprises a back frame (10) and a sheet-like member (11) stretched on the back frame (10). The back frame (10) is provided with a sheet-like member (11). A lumbar support (12) is provided so as to support from the rear side.
[0013]
3 is a front view of the back frame (10) provided with the lumbar support (12) as seen from the lower side, FIG. 4 is an exploded view of the main part in FIG. 3, and FIG. It is an VIII line enlarged vertical sectional view.
[0014]
The back frame (10) has an upper and lower frame (10a) (10b) that curves backward, has an inverted pentagonal shape when viewed from the front, and a front portion that protrudes approximately a quarter from the bottom when viewed from the side. The shape is facing and the upper one-sixth has a shape inclined backward and upward.
[0015]
A lumbar support support portion (13) is integrally projected upward at the lower center of the inner side of the back frame (10), and the lumbar support support portion (13) has a free end at the front of the lumbar support support portion (13). Support (12) is installed.
[0016]
The lumbar support support part (13) has a substantially triangular shape that is wide at the bottom and narrows toward the top, and supports the guide part (15) integrated with the lumbar support (12) at the center of the front surface. A pair of left and right support ridges (16) and (16) are provided, and screw holes (17) and (17) are provided at upper and lower ends between the left and right support ridges (16 and 16). ) Is drilled.
[0017]
The guide portion (15) has a vertically long rectangular plate shape, and a pair of left and right slits (18) and (18) for imparting flexibility in the vertical direction are formed in the middle of the vertical direction and slightly upward. An engagement protrusion (19) is provided at the center of the flexible portion between the slits (18) and (18).
[0018]
The guide portion (15) is wider than the width between the left and right support ridges (16), (16) in the lumbar support support portion (13), and the guide portion (15) is connected to the left and right support ridges ( 16) As shown in FIG. 8, the two screws (20) and (20) are inserted into the through holes (21) and (21) provided at the top and bottom of the guide portion (15) as shown in FIG. The lumbar support support portion (13) is fastened to the screw holes (17) and (17) and is screwed to the lumbar support support portion (13).
The lumbar support (12) includes a lumbar support body (22) and a cushion member (23).
[0019]
FIG. 5 is a rear view of the lumbar support body (22).
The lumbar support body (22) has operating handles (24) and (24) extending on both the left and right sides of a horizontally long inverted triangle, and a vertical sliding frame (25) at the bottom of the rear surface. It is integrally formed so as to protrude downward.
The outer ends of the left and right operation handles (24) and (24) are located inward of the back frame (10).
[0020]
6 and 7 are an enlarged cross-sectional view taken along line VI-VI and an enlarged cross-sectional view taken along line VII-VII in FIG. 5, respectively.
As shown in FIGS. 5 to 8, the sliding frame (25) is formed on the rear surface of the vertically long plate (27) in which a plurality of engaged grooves (26) facing the left and right directions are provided in the vertical direction. Locking pieces (28) and (28) each having an inward locking claw (28a) at the tip are provided above and below the left and right edges, respectively.
[0021]
As shown in FIG. 8, the cushion member (23) is formed by attaching a horizontally long substantially inverted cushion material (30) to the front surface of the substantially identical base plate (31).
[0022]
FIG. 9 is a partially enlarged view of the lumbar support main body (22) in the broken-line circle (A) in FIG.
As shown in FIG. 9, the base plate (31) is provided with a through hole (32), and the rear surface of the cushion material (30) has a through hole (32) at a position corresponding to the through hole (32). ) Having a diameter larger than that of the hole (33), and both the through hole (32) and the concave hole (33) step around the through hole (32) on the front surface of the base plate (31). A mounting hole (35) serving as a portion (34) is formed.
[0023]
On the other hand, a retaining member (36) is fastened with a screw (37) at a position corresponding to the mounting hole (35) in the lumbar support main body (22). On the outer peripheral surface of the retaining member (36), a locking claw (36a) elastically biased toward the outside is provided. The retaining member (36) is inserted into the mounting hole (35) provided on the rear surface of the cushion member (23), and the locking claw (36a) of the retaining member (36) is inserted into the mounting hole (35). The cushion member (23) is integrally attached to the lumbar support main body (22) by being engaged with the step portion (34).
[0024]
The lumbar support (12) consisting of the cushion member (23) and the lumbar support body (22) is provided with the locking claws (28a) (28a) of the left and right locking pieces (28) (28) in the sliding frame (25). ) Is engaged with the left and right edges (15a) and (15a) of the rear surface of the guide part (15) in the lumbar support support part (13), so that the sliding frame (25) is vertically moved to the guide part (15). And is slidably fitted.
[0025]
As shown in FIG. 8, since the guide part (15) is attached to the lumbar support support part (13) so as to be slightly curved forward, the left and right slits (18) ( 18) The engaging projections 19 provided between them (see FIG. 4) are elastically biased forward. Therefore, by moving the lumbar support (12) to an appropriate position in the vertical direction, the engagement protrusion (19) is provided with any one of the engaged grooves (26) provided in the vertical direction on the sliding frame (25). By elastically engaging, the vertical position of the lumbar support (12) is stably held at that position.
[0026]
On the other hand, when trying to move the lumbar support (12) up and down against the elastic urging force, the engagement protrusions (19) provided between the left and right slits (18) and (18) As the plate portion between 18) and 18 retreats with the backward curve, the engagement with the engaged groove (26) is released, and the lumbar support (12) can be moved up and down freely.
[0027]
Next, the lumbar support (12) is moved up and down to determine a desired new vertical position, and the engagement protrusion (19) is elastically engaged with the other engaged groove (26) closest to the position. Thus, the lumbar support (12) is again stably held at that position.
On the back frame (10), a sheet-like member (11), for example, a net member (38) is stretched.
[0028]
10, FIG. 12, and FIG. 13 are a cross-sectional view taken along line X-X, a vertical cross-sectional view taken along line XII-XII, and a vertical cross-sectional view taken along line XIII-XIII in FIG.
The frame member (39) forming the back frame (10) has a cross-section inclined forward from the outside to the inside, and the inner edge and the outer edge of the frame member (40) and the outer edge, respectively. It is formed from a thick and rigid member provided with a ridge (41).
[0029]
As shown in FIG. 3, the front surface of the back frame (10) is provided with forward-facing locking projections (43) having screw holes (42) at appropriate positions over the entire circumference of the back frame (10). Yes.
The net member (38) is stretched on the back frame (10) using the fixed frame (44).
[0030]
FIG. 11 is an exploded view showing the back frame (10) and the fixed frame (44) in FIG. 10 separately.
The fixed frame (44) is a frame-like object that is fitted over the entire circumference of the front surface of the back frame (10), and the cross section of the fixed frame (44) is the inner edge ridge (40 in the frame material (39) of the back frame (10). ) And the outer edge ridge (41) .The frame member (45) has a width that can be fitted between the outer edge ridges (41) .In the vicinity of the outer edge of the rear surface of the frame member (45), the rearward holding groove (46 ) And an outer edge upright piece (47) is formed by the rearward holding groove (46). Further, inwardly of the holding groove (46) on the rear surface of the frame member (45), the inside is enlarged in a position corresponding to the locking projection (43) in the back frame (10), so that a stepped portion is formed. A locking hole (49) having (48) is provided.
[0031]
The net member (38) is stretched on the back frame (10) by the following procedure.
A retaining member (50) is fastened to the front end of the locking projection (43) of the back frame (10) with a screw (51).
On the outer peripheral surface of the retaining member (50), a locking claw (50a) elastically biased toward the outside is provided.
[0032]
Next, the peripheral part of the net member (38) is brought into contact with the front surface and the outer surface of the fixed frame (44), and then the outer end thereof is bent inward to be fixed to the outer peripheral edge of the net member (38). The inserted insertion piece (52) is inserted into the holding groove (46).
[0033]
Next, with the rear surface of the fixed frame (44) facing the front surface of the back frame (10), the locking projection (43) with the retaining member (50) attached to the front end of the back frame (10) is secured. The locking claw (50a) of the retaining member (50) is engaged with the stepped portion (48) of the locking hole (49) by being fitted into the locking hole (49) of the fixed frame (44). Then, the rear surface of the fixed frame (44) is brought into close contact with the front surface of the back frame (10) to integrate the back frame (10) and the fixed frame (44).
[0034]
As a result, the insertion piece (52) fixed to the outer peripheral edge of the net member (38) is fixed in a state of being inserted into the holding groove (46), so that the net member (38) is fixed to the back frame. Stablely stretched on the front of (10).
[0035]
As shown in FIG. 2, the upper part of the backrest (5) is provided with the tip of a support (53) projecting rearward from the rear surface of the upper part in the left-right direction provided at the upper part of the backrest support (6). It is attached to the back support rod (6) by being pivotally supported by the mounting shaft (54).
[0036]
The lower part of the backrest (5) consists of a support (55) projecting rearward from the rear surface of the lower part and a support (56) projecting forward from the lower front face of the backrest support support (6). By connecting the tips of both supports (55) and (56) to each other and changing the front and rear positions of the lower part of the backrest (5) with the operating lever (57), the back tilt angle of the backrest (5) is finely adjusted. It is attached to the backrest support ridge (6) in such a way that it can be adjusted.
[0037]
【The invention's effect】
According to the present invention, the following effects can be achieved.
(1) According to the first aspect of the present invention, since the guide portion facing in the vertical direction is provided at the center of the back frame, and the lumbar support is provided slidably along the guide portion, the left and right sides of the lumbar support are provided. Even if the applied force is not uniform, the lumbar support can be easily and smoothly slid in the vertical direction to adjust its position.
In addition, since the lumbar support is provided in the center of the back frame on the rear surface side of the seat-like member, when the seated person has a small backward tilt, the back and back are gently supported by the seat-backed seat-like member, If the lumbar support function becomes necessary to a certain extent, the function will be performed moderately.
Further, since the lumbar support is composed of the lumbar support main body and the cushion member, a lumbar support having cushioning properties can be obtained.
Furthermore, a lumbar support in which the cushion member is attached to the lumbar support main body using the attachment hole is obtained.
[0038]
( 2 ) According to the invention described in claim 2 , the lumbar support in which the cushion member is attached to the lumbar support body using the engaging claws elastically biased toward the outside provided on the outer peripheral surface of the retaining member. Is obtained.
[0039]
( 3 ) According to the invention described in claim 3, since the left and right ends of the operating handle are located inward of the back frame, the appearance is good and the both ends protrude from the back frame. Accidents such as injury or damage to other furniture can be prevented.
Further, the lumbar support function can be exhibited at the position in the vertical direction desired by the seated person.
[0040]
( 4 ) According to the invention described in claim 4, since the upper end of the lumbar support support portion forms a free end, the upper end of the lumbar support support portion tilts backward according to the rearward tilt angle of the back of the seated person, In addition, the restoring force from the rearward tilt state also increases. Therefore, the lumbar support function is exhibited at different desirable forward upward angles and magnitudes of force depending on the backward tilt angle of the seated person.
[0041]
(5) According to the fifth aspect of the present invention, in addition to the effects of the invention of claim 5, wherein the adjustment it is possible to easily perform the vertical position of the lumbar support in the vertical position after adjusting, lumbar support Can be held stably.
[Brief description of the drawings]
FIG. 1 is a front view of a chair including a backrest device according to an embodiment of the present invention.
FIG. 2 is a side view of the same.
FIG. 3 is a front perspective view of a back frame provided with a lumbar support as viewed from a slightly lower side.
FIG. 4 is an exploded view showing a main part in FIG. 3 in an exploded manner.
FIG. 5 is a rear view of the lumbar support main body.
6 is an enlarged cross-sectional view taken along line VI-VI in FIG.
7 is an enlarged cross-sectional view taken along line VII to VII in FIG.
8 is an enlarged vertical sectional view taken along line VIII-VIII in FIG.
9 is a partially enlarged view in a broken line circle A in FIG.
10 is an enlarged cross-sectional view taken along line X to X in FIG.
11 is an exploded view showing the back frame and the fixed frame in FIG. 10 separately.
12 is an enlarged vertical sectional view taken along line XII to XII in FIG.
13 is an enlarged vertical sectional view taken along line XIII to XIII in FIG.
[Explanation of symbols]
(1) Chair
(2) Leg
(3) pedestal
(4) Support base
(4a) Side wall
(5) Backrest
(6) Back support heel
(6a) Tube part
(7a) (7b) Seat support frame
(8) Seat
(9) Support shaft
(10) Back frame
(10a) Upper frame
(10b) Bottom frame
(11) Sheet member
(12) Lumber support
(13) Lumber support support
(15) Guide section
(15a) Edge
(16) Supporting ridge
(17) Screw hole
(18) Slit
(19) Engagement protrusion
(20) Screw
(21) Through hole
(22) Lumber support body
(23) Cushion member
(24) Operation handle
(25) Sliding frame
(26) Engagement groove
(27) Plate
(28) Locking piece
(28a) Locking claw
(29) Retaining member
(30) Cushion material
(31) Base plate
(32) Through hole
(33) Recessed hole
(34) Step
(35) Mounting hole
(36) Retaining member
(36a) Locking claw
(37) Screw
(38) Net member
(39) Frame material
(40) Inner edge ridge
(41) Outer edge ridge
(42) Screw hole
(43) Locking projection
(44) Fixed frame
(45) Frame material
(46) Backward holding groove
(47) Outer edge upright piece
(48) Step
(49) Locking hole
(50) Retaining member
(50a) Locking claw
(51) Screw
(52) Insert
(53) Support
(54) Mounting shaft
(55) (56)
(57) Control lever

Claims (5)

In the back frame with the outer periphery of the sheet-like member fixed, a guide part that faces in the vertical direction is provided at the center of the back frame on the rear surface side of the sheet-like member, and a lumbar support that can slide along the guide part is provided. The lumbar support is composed of a lumbar support main body and a cushion member. The cushion member is formed by attaching a cushion material to the front surface of a base plate having the same shape as the cushion material, and a through hole is formed in the base plate. A recess hole having a diameter larger than that of the through hole is provided at a position relative to the through hole on the rear surface of the cushion material, and the periphery of the through hole on the front surface of the base plate is formed by both of the through hole and the concave hole. A mounting hole is formed as a stepped portion, and on the other hand, a retaining member is provided at a position corresponding to the mounting hole in the lumbar support main body, and the retaining member is inserted into the through-hole to prevent the retaining member. By engaging the timber with the stepped portion of the mounting hole, through the holes, by attaching the cushion member to the lumbar support body constitutes a lumbar support, further to the lumbar support, the upper and lower sliding operation A backrest device for a chair, characterized in that a handle for operation is provided. The cushion member is attached to the lumbar support main body by providing a locking claw elastically biased outward on the outer peripheral surface of the retaining member and locking the locking claw to a step portion in the mounting hole. The chair backrest device according to claim 1 . The backrest of the chair according to claim 1 or 2 , wherein the left and right ends of the operation handle are positioned inward of the back frame, and the vertical position of the lumbar support can be adjusted. apparatus. A lumbar support support portion having an upper end forming a free end is provided upward from a lower portion of the back frame, and a guide portion facing the vertical direction is provided on the lumbar support support portion. The chair backrest device according to any one of 3 above. By providing a guide portion facing in the vertical direction on the front side of the lumbar support support portion, and engaging the engagement portion provided on the guide portion and the engaged portion provided on the rear surface side of the lumbar support, The chair backrest device according to claim 4 , wherein the vertical position of the lumbar support can be adjusted.

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