JP6876409B2 - Chair back - Google Patents

Description

The present invention relates to a backrest provided with a lumbar support device.

In the chair, a lumbar support device that supports the occupant's lumbar region from behind is provided in order to hold the occupant's upper body in an appropriate posture, especially in the working state. Various types of lumbar support devices have been proposed. As an example, in Patent Document 1, an upward link is provided along the left and right back columns, and a lumbar support device is provided at the upper end of each of the left and right links. Is disclosed.

In Patent Document 1, the backrest is a mesh type, and the lumbar pads are arranged close to the left and right sides of the back frame. Therefore, to prevent or suppress the lumbar pad hits the body of the seated person, and advantages can be eliminated feeling tightness against the body of the user, the lumbar pad is good appearance without conspicuous in back-view of the chair element There are advantages such as.

Japanese Unexamined Patent Publication No. 2014-140765

By the way, the structure of the backrest is various, and there are many cases where the link is not provided as in Patent Document 1. Therefore, for example, in the case of a backrest of a type in which a mesh material is stretched on a back frame opened in the front-rear direction, a bracket is often provided on the back frame or the back support, and a lumbar pad is attached to the bracket. However, this has the problem that the brackets are conspicuous and the appearance is not always good. In addition, the seated person may feel uncomfortable due to the strong contact of the body with the lumbar pad during locking.

The present invention has been made to improve such a situation, and is intended to provide a backrest with a lumbar support device in an improved form.

The invention of the present application is
"The CFCs bets frame attached to overlap the front of the back frame which is open in the longitudinal, deformable support body for supporting the body pressure of the occupant is provided,
And, wherein the inner portion of the left and right sides of the front frame and lumbar support device for supporting the front Symbol support body from behind is attached "
It is a basic configuration.

And in the above basic configuration
"The lumbar support device comprises a lifting guide member fixed to the front frame, a lumbar pad mounted vertically movably on the elevation guide member, and an operating device for lifting operation the lumbar pad, the lifting The guide member and the lumbar pad are provided with engaging means for holding the lumbar pad at a set height. "
The configuration is added.

Further, in claim 2 Examples of claim 1,
"The elevating guide member includes a main body case incorporating the elevating guide member. "
It is configured as.
Further, as a specific example of claim 2 , claim 3
"The main body case overlaps the front frame are fastened together with the elevating guide members and Gabi scan and the front frame and the main body case"
It is configured as.

In claim 4 , in claim 3 ,
"The screws, the provided on the front frame is screwed to the elevating guide member and the outer et insertion, the head of the screw is hidden by the support body overlapping the front to the front frame"
It is configured as.

In the present invention, since the lumbar support device is attached to the inner portion of the front frame, the lumbar support device can be made inconspicuous and the aesthetic appearance can be improved as compared with the case where the lumbar support device is attached to the back frame or the back support. Further, since the front frame, which is a component of the backrest, is used as it is for attaching the lumbar support device, the structure of the backrest as a whole can be simplified and contribute to cost reduction.

Also, special structure for attaching the lumbar support device is necessary, and the a type that includes a lumbar support device, in which assortment and types without a lumbar support device, the basic construction of the backrest Since they are common, the cost can be reduced accordingly. Further, since it is not necessary to form a mounting portion for providing the lumbar support device on the back frame or the front frame, the structure of the backrest can be simplified and contribute to the improvement of the aesthetic appearance.

In addition, the lumbar pad can be set to a height that suits the physique and taste of the seated person, making it user-friendly.

If the main body case is provided as in claim 2 , the elevating guide member can be designed without considering the aesthetics, so that the freedom of design can be improved. Further, as in claim 3 , if the main body case is superposed on the front frame and the front frame, the main body case, and the elevating guide member are fastened together with screws, the fastening structure can be simplified and the labor for assembly can be reduced accordingly.

When the configuration of claim 4 is adopted, since the screw for fixing the lumbar support device is inserted into the front frame from the outside and screwed in, the screwing operation of the screw can be easily performed. Moreover, since the head of the screw is hidden by the support body, the aesthetic appearance does not deteriorate. Therefore, the lumbar support device can be easily attached while preventing the screw head from being exposed and deteriorating the aesthetic appearance.

As the support body, a back plate integrally formed with the front frame can be adopted, but if a mesh material is used as the support body as in the embodiment, the mesh material is easily deformed by being pushed by the lumbar pad. Even when the lumbar pads are arranged on the left and right to support the support body, it is possible to accurately form a forward protruding portion on the mesh material to support the lumbar portion of the seated person. Therefore, the lumbar region of the seated person can be stably supported without giving the seated person a feeling of pushing up.

It is an external view of the chair according to the embodiment, (A) is a perspective view seen from the front, (B) is a perspective view seen from the back, and (C) is a rear view. (A) is a perspective view with the front frame separated, and (B) is a perspective view with the back frame shifted backward. It is a separated perspective view which shows the relationship between a front frame and a back frame. (A) is a side view, (B) is a side view in which the front frame is separated, and (C) is a side view in which the front frame and the back frame are separated. (A) is a partially separated perspective view of the main part, and (B) is a perspective view showing the relationship between the front frame and the lumbar support device. (A) is a separated perspective view of the entire lumbar support device, and (B) is a partial separated perspective view. (A) is a separated perspective view seen from the back, and (B) is a separated perspective view of the lever. (A) is a perspective view of a main part in a state where the lumbar pad is separated, and (B) and (C) are separate perspective views showing the relationship between the lumbar pad and the elevating guide member (Note that (B) and (C) are , The lumbar pad is displayed in a swiveled state in a plan view.) (A) is a plan view of the lumbar support device, and (B) is a separated perspective view showing a mode of fastening to the front frame. FIG. 5 is a sectional view taken along line XX of FIG. 1 (C). FIG. 3 is a sectional view taken along line XI-XI of FIG. 1 (C).

(1). Outline Next, an embodiment of the present invention will be described with reference to the drawings. First, the outline of the chair will be described with reference to FIGS. The chair of the present embodiment is a swivel chair that is often used for office work, and includes a seat 1, a backrest 2, and a leg device 3 with casters as main elements. A base body 5 (FIG. 2 (B)) is provided at the upper end of a leg support 4 (see FIG. 1 (A)) constituting the leg device 3, and a back frame 6 is connected to the base body 5 so as to be tiltable backward.

An intermediate member 7 is connected to the base body 5 and the back frame 6, and a seat 1 is attached to the intermediate member 7. When the backrest 2 tilts backward, the intermediate member 7 rises and retracts. Therefore, a part of the weight of the seated person acts as a resistance to the backward tilt of the backrest 2 (the locking resistance is weight-sensitive).

The backrest 2 has a back frame 6 described above and a front frame 8 attached to the front surface thereof. The back frame 6 and the front frame 8 are made of resin, and both are vertically elongated left and right side members 6a and 8a, upper members 6b and 8b connected to the upper ends thereof, and lowers connected to the lower ends of the side members 6a and 8a. It has members 6c and 8c.

Further, the back frame 6 has a groove shape that opens forward, and the front frame 8 has a groove shape that opens backward. Therefore, the front frame 8 is attached to the front frame 8 so as to close the groove of the back frame 6. A pair of left and right forward facing arms 6d are formed on the lower member 6c of the back frame 6, and the front end portion of the forward facing arms 6d is connected to the base body 5. The back frame 6 may be attached to a tilting member that is rotatably connected to the base 5 without integrating the back frame 6 and the forward arm portion 6d.

A mesh material 9 as an example of the support body is attached to the front frame 8. As a means for attaching the mesh material 9, a tape-shaped edge member is fixed to the outer circumference of the mesh material 9, and on the left and right side portions and the lower portion, the edge member is formed on the back surface (rear surface) of the front frame 8. In the upper part of the front frame 8, it is fitted into a groove formed in the upper member 8b.

As a means for attaching the front frame 8 to the back frame 6, first, as shown in FIG. 3, a plurality of downward engaging claws 10 are formed vertically on the side members 8a of the front frame 8, and each downward engaging claw is formed. 10 is fitted into the upward engaging claw 11 formed on the side member 6a of the back frame 6. Further, while the plate-shaped positioning ribs 12 are formed at a plurality of height positions on the side members 8a of the front frame 8, the fitting portions in which the positioning ribs 12 are fitted to the side members 6a of the back frame 6 so as not to be displaced from side to side. 13 is formed.

Further, while the left and right ends of the upper member 8b of the front frame 8 forms a upper engaging pawl 14-out hooks shaped downward, the upper member 6b of the back frame 6, the upper engaging claw 14 is fitted from above The round receiving portion 15 is formed, and the upper engaging claw 14 is held by the upper member 6b of the back frame 6 in a state where it does not easily shift up and down.

As is clearly shown in FIG. 4, the lower portion of the side member 6a of the back frame 6 is bent in a dogleg shape in a side view, while the side member 8a of the front frame 8 is also in the front of the seated person's waist. It is bent in an abbreviated shape in a side view so that it becomes. In this case, the apex of the side member 8a in the front frame 8 is located below the apex of the side member 6a in the back frame 6, and is located below the apex of the side member 6a of the back frame 6 in the front frame 8. The lower part is an overhang part. Therefore, the lower end of the front frame 8 is a free end that is not fixed to the back frame 6.

A lumbar support device 16 that supports the mesh material 9 from behind is attached to the free end of the side member 8a of the front frame 8. Next, the lumbar support device 16 will be described.

(2). As will be readily appreciated from the lumbar support device 6, the lumbar support device 16 includes a forward box-shaped main body case (cover) 19 which is open, the lift slider 20 of the groove shape with fitted therein An elevating guide member 21 arranged inside the main body case 19 while being sandwiched between the elevating sliders 20, a lumbar pad 22 arranged in front of the main body case 19, and a lever connected to the elevating slider 20 and the lumbar pad 22. It has 23 and. The elevating guide member 21 may be simply fitted into the main body case 19 or may be fixed to the main body case 19 with screws.

The bottom of the main body case 19 is narrowed backward, so that the elevating slider 20 has a plan view shape that looks like a U-shape. The lever 23 extends rearwardly from the rear surface of the lumbar pad 22. Further, the lumbar pad 22 is vertically elongated and has a rounded shape as a whole. Further, as shown in FIGS. 5A and 7A, the lumbar pad 22 is provided with a guide rib plate 22a that overlaps the outer surface of the main body case 19.

The main body case 19 has a long shape in the vertical direction, and the elevating guide member 21 also extends long to the upper and lower ends inside the main body case 19. Then, by providing the legs 24 facing backward at both the upper and lower ends of the elevating guide member 21, a gap is formed between the elevating guide member 21 and the main body case 19 between the upper and lower foot portions 24, whereby the elevating slider 20 Allows up and down slides. A head portion 25 having a foot portion 24 is formed at both upper and lower ends of the elevating guide member 21, and the head portion 25 is fitted in the main body case 19 so as not to be displaced horizontally or vertically.

As can be well understood from FIG. 8, a square holder portion 26 is formed on the rear surface of the lumbar pad 22, and the holder portion 26 is fitted between the left and right side plates of the elevating slider 20, while the lever 23 is oriented sideways. The support shaft 27 is fixed, and the holder portion 26 and the elevating slider 20 are connected by the support shaft 27. Therefore, the lumbar pad 22, the lever 23, and the elevating guide member 21 move up and down (elevate) together.

As shown in FIG. 8A, a guide groove 19b in which the support shaft 27 moves up and down in close contact is formed on the inner plate of the main body case 19 on the side opposite to the front frame 8. The lumbar pad 22 can be stably held by the support shaft 27 coming into contact with the guide groove 19b and moving up and down. On the other hand, as clearly shown in FIG. 8A, the lumbar pad 22 is formed with a side plate 22b arranged inside the main body case 19, and the side plate 22b is for avoiding a collision with the support shaft 27. Notch 22c is formed.

The lumbar pad 22 is held stepwise at a plurality of height positions. Therefore, a plurality of stages of engaging grooves (or engaging protrusions) 28 are formed in the elevating guide member 21, and the stopper 30 urged by the spring 29 is brought into contact with the engaging grooves 28. Therefore, the engaging groove 28 and the stopper 30 serve as the engaging means according to the claim. The engaging groove 28 is formed at the bottom of the vertically elongated elongated groove 31. Therefore, the stopper 30 is held by the long groove 31 so as not to be displaced from side to side. The rear end of the stopper 30 is formed in a side view angle shape so as to move up and down and easily fit and detach into the engaging groove 28.

As shown in FIG. 10, the stopper 30 is fitted in the holder portion 26 of the lumbar pad 22 so as to be movable back and forth, and is urged backward by the spring 29. Therefore, the spring 29 is arranged so as not to fall off between the bottom surface of the holder portion 26 and the stopper 30.

While the stopper 30 has a square hole 32 opened upward, the arm body 33 fixed to the support shaft 27 of the lever 23 is fitted into the holder portion 26 of the lumbar pad 22, and the tip of the arm body 33 is fitted. The portion is fitted into the square hole 32 of the stopper 30. The arm body 33 is roughly formed in an L shape, and is fixed to the support shaft 27 by a screw 34. In FIGS. 6 (A) and 7 (B), the screw 34 is indicated by an arrow. The lumbar pad 22 has a relief hole 35 (see FIG. 6A) for inserting the screw 34.

When the lever 23 is rotated in the direction of the arrow 36 in FIG. 10, the stopper 30 retracts against the spring 29. Therefore, the elevating slider 20, the lumbar pad 22, and the lever 23 can be elevated and lowered. When the lever 23 is released, the stopper 30 is pushed by the spring 29 to maintain the heights of the elevating slider 20 and the lumbar pad 22.

As shown in FIG. 10, the upper surface of the engaging groove 28 of the elevating guide member 21 is a gently inclined inclined surface 28a, and the lower surface is horizontal. Therefore, when a finger is put on the lever 23 and pushed upward, the stopper 30 is pushed by the elevating guide member 21 and becomes selfish, but the guide action of the inclined surface 28a prevails and raises the elevating slider 20 and the lumbar pad 22. be able to. That is, the stopper 30 escapes and moves toward the front against the spring 29, so that the lumbar pad 22 is allowed to move upward.

When the lever 23 is pushed downward, the arm 33 rotates and the stopper 30 escapes from the engaging groove 28. Therefore, the elevating slider 20 and the lumbar pad 22 can be lowered. When the seated person leans against the backrest 2, a downward component force is applied to the lumbar pad 22, so if the stopper 30 and the engaging groove 28 are shallowly engaged, the stopper 30 and the lumbar pad 22 move downward. It may end up.

However, in the present embodiment, since the engaging groove 28 functions firmly as a resistance to the downward movement of the stopper 33, it is possible to prevent the lumbar pad 22 from being unintentionally lowered due to the body pressure of the seated person. it can. The number of steps for adjusting the height of the lumbar pad 22 can be arbitrarily set. Further, the lumbar pad 22 can be adjusted in height steplessly.

As is clearly shown in FIG. 11, the outer surface 19a of the main body case 19 overlaps the inner surface of the side member 8a of the lumbar pad 22, and the main body case 19 has the rear end of the side member 8a of the lumbar pad 22. A rib 37 is provided so as to overlap with the rib 37. Therefore, the main body case 19 is precisely positioned on the side member 8a of the front frame 8. The main body case 19 is fixed to the side member 8a of the front frame 8 by a screw (not shown).

Further, the main body case 19 is provided with a wing piece 38 extending backward, and the wing piece 38 is brought into close contact with the inner surface of the side member 6a in the back frame 6. The wing piece 38 overlaps the side member 6a in the back frame 6 in a state where it allows a certain amount of backward movement. Therefore, it is allowed that the overhang portion (lower part) of the front frame 8 is bent backward and deformed. Further, even if a person locks the main body case 19 while touching it for some reason, the finger is not caught between the main body case 19 and the back frame 6.

As shown in FIGS. 8 (B) and 6 (A), a downward hook portion 39 is formed on the inner plate 20a of the elevating slider 20, and as can be understood from FIG. 8 (B), the elevating slider 20 The inner plate 20a is sandwiched between the holder portion 26 of the lumbar pad 22 and the inner plate 22a, and is fitted to the downward hook portion 39 of the elevating slider 20 in a state of being hung on the holder portion 26 and the inner plate 22a. It forms the plywood 40.

Therefore, the lumbar pad 22 and the elevating slider 20 are firmly fitted at the lower portion, and are held so as not to be separated from each other by the fitting (engagement) between the engaging plate 40 and the downward hook portion. The lumbar pad 22 is a resin injection-molded product, and is molded by using a mold having a shape that overlaps from the front and back. However, the lumbar pad 22 has an opening hole 41 for forming an engaging plate 40. doing.

As shown in FIG. 9B, the main body case 19 and the elevating guide member 21 are fastened (fixed) to the side member 8a of the front frame 8 with screws 42. That is, the main body case 19, the elevating guide member 21, and the front frame 8 are fastened together with the screws 42. Therefore, a screw insertion hole 43 is formed in the side member 8a of the front frame 8 and one side plate of the main body case 19, and the screw 42 insertion hole 44 is also formed in the upper and lower head portions 25 of the elevating guide member 21. ing. Then, as shown in FIGS. 6 and 9, the head portion 25 is provided with a pocket portion 25a for non-rotatably holding a nut (not shown) into which the screw 42 is screwed. In this case, in the example of FIG. 6, the pocket portion 25a is opened toward the front, and in the example of FIG. 9, it is opened backward. Therefore, the head portion 25 is slightly different between FIGS. 6 and 9.

The screw insertion hole 43 of the front frame 8 is formed in the pedestal portion 46 formed on the inner surface of the inner wall 8'of the front frame 8, and a mesh material folded back from the surface is formed on both the upper and lower sides or one side of the pedestal portion 46. The rib 47 is formed by overlapping the edge portion of the 9 or the edge member fixed to the edge of the mesh material 9. Therefore, there is a space behind the folded portion or the edge member of the mesh material 9, and the head of the screw 42 is hidden by the mesh material 9 or the edge member thereof. Therefore, the aesthetic appearance does not deteriorate.

(3). Summary In the present embodiment, since the lumbar support device 16 is arranged at the inner surface of the left and right side members 8a in the front frame 8, the lumbar support device 16 is not so conspicuous. Therefore, it looks good. In addition, the body of the lumbar pad 22 never hits or hardly hits. Therefore, the lumbar support function can be exhibited in a state where the feeling of tension is eliminated.

As can be understood from FIGS. 11 and 1 (C), in the present embodiment, the lumbar pad 22 projects greatly upward from the holder portion 26. Therefore, even if the holder portion 26 is located at the upper end portion of the elevating guide member 21, the upper end of the lumbar pad 22 can be projected above the main body case 19. Therefore, even if the main body case 19 is arranged in the overhang portion of the front frame 8, the lumbar support position adjustment function by the lumbar pad 22 can be accurately exerted (position above the apex portion of the side member 8a in the front frame 8). You can bring the lumbar support department to .) .

In the present embodiment, the left and right lumbar support devices are arranged separately, but the left and right horizontally long stays may be fixed to the left and right side members of the front frame, and the lumbar pads may be attached to the stays. The lumbar pad does not have to be height adjustable. When the lumbar pads are provided separately on the left and right, the left and right lumbar pads may be raised and lowered at the same time by connecting the left and right lumbar pads with stays and providing an operation unit on the stay.

For example, as shown in FIG. 1C, the left and right main body cases 19 are arranged in an inverted C-shaped posture in a front view so that the distance increases toward the top. Therefore, the lumbar pad 22 moves up and down in a direction inclined with respect to the vertical line. This is due to the posture of the side member 8a in the front frame 8, but as a result, the higher the lumbar pad 22, the stronger the tension is applied to the mesh material 9. Further, the higher the lumbar pad 22, the harder it is for the lumbar pad 22 to hit the body.

In the present embodiment, the front frame 8, the elevating guide member 21, and the main body case 19 are fastened together with two upper and lower screws 42. Therefore, the lumbar support device 16 can be firmly fixed with a small number of screws 42. It is possible to prepare a backrest 2 with the lumbar support device 16 and a backrest 2 without the lumbar support device 16 as an optional item, but the screw insertion hole 43 of the front frame 8 is visible in the back view. Since it is difficult, there is no problem of aesthetics even if the lumbar support device 16 is not attached. Therefore, the backrest 2 can be shared between the type provided with the lumbar support device 16 and the type not provided with the lumbar support device 16, and the cost can be suppressed.

As can be clearly understood from FIG. 9 (A), the lever 23 has extremely shape behind widened before the width is narrower, before assembly, such upper girder as has e.g. only lumbar pad 22 In this case, it is possible to prevent the lumbar support device 16 from being separated.

That is, each member such as the lumbar pad 22 excluding the main body case 19 is unitized in a state where it is not separated, but since the main body case 19 is only fitted to the unit, special treatment is required. , The main body case 19 will come off when the lumbar support device 16 is lifted by hand. Depending on how it is handled, the unit and the main body case 19 will be easily separated. However, in this embodiment, the lever is used. When the 23 is attached, even if a part of the members is grasped and lifted, the wide portion of the lever 23 hits the main body case 19, so that the unit such as the lumbar pad 22 and the main body case 19 are separated (one of them falls off). This can be prevented and the lumbar support device 16 can be maintained in an integrated state. Therefore, it is possible to prevent the lumbar support device 16 from being disassembled at the stage before assembly without requiring a member such as a band.

Further, since the latter half of the lever 23 has a shape that expands toward the side of the front frame 8, it is possible to secure an area for firmly touching the finger while making it as inconspicuous as possible.

The side members of the front frame do not need to have the lower portion formed on the overhang portion as in the embodiment, and the entire side member may be overlapped on the front surface of the back frame. Further, the front frame may be fixed to the back frame with fasteners such as screws.

The invention of the present application can be actually embodied in a chair. Therefore, it can be used industrially.

2 Backrest 6 Back frame 6a Side member 8 Front frame 8a Side member 9 Mesh material as an example of support body 16 Lumber support device 19 Main body case 20 Lifting slider 21 Lifting guide member 22 Lumber pad 23 Lever 25 Head part 26 Holder part 27 Support Shaft 28 Engagement groove 29 Spring 30 Stopper 33 Arm 37 Rib 38 Wing piece
42 screws

Claims (4)

The CFCs bets frame attached to overlap the front of the back frame which is open in the longitudinal, deformable support body for supporting the body pressure of the occupant is provided,
And, wherein the inner portion of the left and right sides of the front frame, a structure in which the lumbar support device is mounted for supporting the front Symbol support member from behind,
The lumbar support device includes an elevating guide member fixed to the front frame, a lumbar pad movably attached to the elevating guide member, and an operating tool for elevating and lowering the lumbar pad. The member and the lumbar pad are provided with engaging means for holding the lumbar pad at a set height.
The back of the chair. The elevating guide member includes a main body case incorporating the elevating guide member.
The backrest of the chair according to claim 1. The main body case overlaps the front frame and
The front frame, the main body case, and the elevating guide member are fastened together with screws.
The backrest of the chair according to claim 2. The screw is inserted into the front frame from the outside and screwed into the elevating guide member, and the head of the screw is hidden by the support body overlapping the front frame from the front.
The backrest of the chair according to claim 3.

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