JP2020058769A - Chair - Google Patents

Abstract

To provide a lumbar support device excellent in a function and beauty.SOLUTION: A lumbar support device 5 comprises a housing 27 fitted in a concave part 28 of a back strut 11. A rail member 25 is incorporated in the housing 27. A clip member 26 is fitted to the rail member 25 so as to be freely elevated and lowered. The clip member 26 is held between a holder member 24 and a lumbar pad 22. Because the whole of the lumbar support device 5 is unitized via the housing 27, dimensional accuracy is high. Because the housing 27 is incorporated in the concave part of the back strut 11, exposure is restrained, and beauty can be improved.SELECTED DRAWING: Figure 9

Description

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

  BACKGROUND ART In a chair having a backrest, it is widely practiced to provide a lumbar support device that supports the waist of a seated person from behind. The structure of the lumbar support device is largely different depending on the structure of the back part.

  For example, Patent Document 1 discloses that a lumbar pad is attached to a back strut so that its height can be adjusted in a configuration in which a backrest is attached to a back frame having a back strut arranged in the left-right intermediate portion. Patent Document 1 has an advantage that the lumbar pad can be firmly supported because the back strut serves as a support member for the lumbar pad.

JP, 2005-152087, A

  By the way, when attaching the backrest to the back frame equipped with back props, various forms of back props are adopted from the viewpoint of design, etc., and various materials such as resin and aluminum die cast are used. Is used.

  And although patent document 1 has the above advantages, since the back pillar uses the metal pipe material or rod material in patent document 1, when the back pillar is made of resin or aluminum die-casting. Is hard to say that it can be applied as it is.

  The present invention has been made against such a background, and it is intended to provide a lumbar support device excellent in function and aesthetics, which can be easily applied to a back strut made of resin or aluminum die cast. Is.

The present invention is
"Having a seat, a backrest, and a back frame to which the backrest is attached, the back frame has a back strut located in the middle portion on the left and right, and the back strut supports the backrest from behind. The lumbar support device is installed. "
According to the invention of claim 1, in this basic configuration,
“The lumbar support device includes vertical rail members provided with height adjusting engaging portions in multiple stages, and lumbar pads attached to the rail member in a height adjustable manner. Is located inside a housing housed in a recess formed in the front of the back column. "
It is configured as.

According to a second aspect of the present invention, in the first aspect,
"A slider to which the lumbar pad is fixed is attached to the rail member so as to be movable up and down, and the slider is attached to the housing so as to be vertically slidable."
It is configured as.

The invention of claim 3 is the same as that of claim 1 or 2,
"A first engaging portion that holds the rail member in a non-displaceable manner is provided at the lower end of the rail member and the lower end portion of the housing, and the lower end portion of the housing and the lower end portion of a recess provided in the back strut are provided. And a second engaging portion that holds the lower end of the housing in a non-displaceable manner,
The upper end of the rail member and the upper end of the housing are fastened together with the back strut by a screw. "
It is configured as.

The invention of claim 4 is the same as that of claim 2 or 3,
`` When the pressing force of the seated person is not acting on the lumbar pad, the slider and the housing are separated from each other to allow the slider to move up and down, and when the pressing force of the seated person acts on the lumbar pad, they engage with each other. There is a locking device that holds the slider in an up and down position. ''
It is configured as.

According to a fifth aspect of the invention, in the same basic configuration as the first aspect,
"The lumbar support device includes a case-shaped housing that is fixed to the back column and is vertically long and long, and the lumbar pad is attached to the housing directly or through a rail member."
It is configured as.

  According to the first aspect of the present invention, the housing can be partially or wholly stored in the recess of the back column, so that it is possible to suppress the exposure of the lumbar support device and improve the appearance. In addition, since it is possible to reduce the distance between the back support column and the backrest as compared with the case where there is no recess, it can be said that the size of the entire chair can be suppressed.

  Further, since the lumbar support device can be unitized by using the housing, there is also an advantage that the lumbar support device can be easily attached to the back strut. Further, since the rail member is hidden in the housing, it is possible to prevent or suppress the rail member or the movable member attached to the rail member from being hit by an object to improve the certainty of movement, and when the person touches it with hand. There is an advantage that the problem of pinching a finger can be eliminated.

  When the configuration of claim 2 is adopted, since the slider is guided to move up and down by the housing wider than the rail member, the smoothness of lifting and lowering the lumbar pad can be improved.

  When the invention of claim 3 is adopted, the lower end portion of the rail member and the lower end portion of the housing are held by the first engaging portion such that they cannot be displaced, and the lower end portion of the housing is retained by the second engaging portion. Since the embodiment is configured such that it cannot be displaced with respect to the engaging portion of the recess by fitting or the like, the rail member and the housing can be fixed to the column by simply fastening the upper parts together with a single screw. There is. Therefore, the lumbar support device can be easily attached.

  By the way, in the lumbar support device capable of adjusting the height of the lumbar pad against the elasticity of the locking member, the lumbar pad may shift when the body pressure of a seated person is applied. If the method of releasing the lock with the lever is adopted, there is a problem that the structure becomes complicated and the cost increases. On the other hand, if the configuration of claim 4 is adopted, the lumbar pad is held so as to be unable to move up and down when the pressing force of the seated person acts on the lumbar pad. It can be prevented from slipping in.

  Further, in the invention of claim 5, since the lumbar support device can be unitized as described above, the lumbar support device can be manufactured with high accuracy regardless of the dimensional accuracy of the back support. Therefore, particularly when the height of the lumbar pad can be adjusted, high quality can be ensured such that the lumbar pad can be easily moved up and down.

It is a figure which shows the chair of 1st Embodiment, (A) is a front perspective view, (B) is a rear perspective view, (C) is a rear perspective view only of a back part. (A) is a perspective view showing a skeleton, (B) is a rear perspective view, and (C) is a separated perspective view. It is a figure which shows a lumbar support apparatus, (A) is the isolation | separation perspective view seen from front, (B) is the isolation perspective view seen from back, (C) is the rear view seen from CC view direction of (B). Is. (A) is a partial perspective view, and (B) is a perspective view with some members mounted on the lumbar pad. (A) is a partially enlarged front view of the housing, (B) is a front view with the lumbar pad omitted, and (C) is a separated front view with the lumbar pad omitted. (A) is a lower perspective view of a lumbar support device, (B) is a partial perspective view of a part, (C) is a vertical side view. It is a figure which shows the chair of 2nd Embodiment, (A) is a front perspective view, (B) is a side view, (C) is a top view. (A) is a front view and (B) is a rear view. It is a figure which shows the lumbar support apparatus of 2nd Embodiment, (A) is the isolation | separation perspective view seen from the front, (B) is the isolation perspective view seen from the back, (C) is the CC view direction of (B). It is the rear view seen from. (A) is a separated perspective view, (B) is a perspective view in which some members are separated, and (C) is a vertical side view.

  Next, an embodiment of the present invention will be described with reference to the drawings. In the following, front and rear / left and right wording is used to specify the direction, but this direction is specified as the state viewed from a person who normally sits down. The front view direction is the direction facing the seated person.

(1). Outline of chair The chair of the present embodiment is applied to a swivel chair that is frequently used in offices and the like. As shown in FIGS. 1 and 2, the chair includes a seat 1, a backrest 2, a back frame 3 to which the backrest 2 is attached, and a caster-equipped leg device 4 as main components. A lumbar support device 5 is arranged behind the backrest 2. In addition, the chair is provided with an armrest device 6 and a headrest (or shoulder rest) 7 as optional items.

  For example, as shown in FIG. 1, a base body 9 is fixed to a leg support (gas cylinder) 8 arranged in the center, and a back frame 3 is connected to the base body 9 via a joint member 10 so as to be tiltable rearward. Therefore, the chair of this embodiment is a rocking type in which the backrest 2 tilts backward against the elastic means.

  The back frame 3 has a vertically long back pillar 11 located in the middle of the left and right, a vertically long upper support 12 mounted horizontally on the upper end of the back pillar 11, and left and right lower supports integrally provided at the lower end of the back pillar 11. 13 and the left and right ends of the upper support 12 and the tip of the lower support 13 are free ends, and the corner portion of the backrest 2 has a tip portion of the upper support 12 and a tip portion of the lower support 13. Are linked to. Therefore, the backrest 2 is attached to the back frame 3 in a state of being supported at four points.

  When the pressing force of a seated person acts biasedly on the right side or the left side of the backrest 2, the upper support 12 pivots horizontally, and the backrest 2 can be twisted and deformed. Therefore, the backrest 2 is twisted and deformed following the movement of the user's body. The back strut 11 and the upper support 12 are made of synthetic resin, and the back strut 11 can also be twisted and deformed by the pressing force of a seated person. The back support 11 and the lower support 13 are covered with a cover from behind.

  As shown in FIG. 1 (C), the upper support 12 has a bow-like shape in plan view so as to be recessed toward the front side (to be bulged toward the rear side), and the backrest 2 is provided at both left and right ends thereof. The left and right ends of are connected. Therefore, there is a large space between the upper support 12 and the backrest 2. Due to the existence of this space, the upper end of the backrest 2 is allowed to extend and deform rearward by the pressing force (body pressure) of the seated person.

  On the other hand, as clearly shown in FIG. 4, for example, the lower support 13 is curved such that the upper surface and the lower surface are higher toward the tip in the rear view, and the lower surfaces of the left and right lower supports 13 and the back columns 11 are formed. The lower surface formed with the lower surface (that is, the lower surface of the back frame 3) is also a curved surface bulging downward. Therefore, the back frame 3 has a shape similar to an anchor as a whole.

  As shown in FIG. 1 (C) and FIG. 6 (C), the backrest 2 has a cushion material 14 stretched on the front and back of a synthetic resin back plate (back inner shell) 2a, and the entire front and back are covered with a bag-shaped skin. The structure is covered with wood.

(2). Lumbar Support Device Next, the lumbar support device 5 will be described mainly with reference to FIGS. As shown in FIG. 3, the lumbar support device 5 includes a lumbar pad 22 that supports the backrest 2 from behind, a holder member 24 fixed to the rear surface of the lumbar pad 22 with left and right screws 23, the lumbar pad 22, and the holder member 24. A rail member 25 and a clip member 26 arranged between the holder member 24 and the rail member 25 are housed in a case-like shape that is open forward. These are molded products of synthetic resin.

  The holder member 24 and the clip member 26 are integrally fixed, hold the rail member 25 from the front and the rear, and are attached to the rail member 25 so as to be movable up and down. Therefore, the holder member 24 and the clip member 26 form the slider described in the claims.

  As shown in FIG. 3, a recess 28 into which the housing 27 is fitted is formed on the front surface of the back column 11. A downward protrusion 29 is formed on the lower surface of the housing 27, while an engaging hole 30 into which the downward protrusion 29 is fitted is formed on the lower surface of the recess 28 of the back strut 11. Further, on the rear surface of the upper end portion of the housing 27, an engaging recessed portion 31 which is recessed toward the front is formed, while in the recessed portion 28 of the back strut 11, an engaging step portion 32 where the engaging recessed portion 31 overlaps is formed. are doing. The bottom surface of the recess 28 has an uneven shape in which peaks and valleys are alternately arranged vertically, but may be a flat surface.

  The rail member 25 has a strip plate shape that is long in the vertical direction. As shown in FIGS. 3 (A) and 3 (B), the rail member 25 has left and right blade plates 33 at the lower end thereof and has a substantially T-shaped locking projection 34 in a plan view. On the other hand, as shown in FIG. 3A, a substantially T-shaped engagement groove 35 into which the locking projection 34 is fitted is formed in the bottom of the housing 27. Therefore, the lower end of the rail member 25 is held with respect to the lower end portion of the housing 27 so as not to be displaced in any of the front, rear, left, and right directions.

  As shown in FIG. 3, a head portion 36 in a rearwardly tilted posture is formed on the upper end portion of the rail member 25, while a groove portion 37 into which the head portion 36 cannot be laterally displaced is fitted to the upper end portion of the housing 27. The head portion 36 and the housing 27 are fastened together with the engaging step portion 32 of the engaging concave portion 31 of the back strut 11 by one screw 38. Therefore, the rail member 25 and the housing 27 are fixed to the back strut 11 with one screw 38 in a state where there is no rattling.

  In the present embodiment, the locking projection 34 provided on the rail member 25 and the engagement groove 35 provided on the housing 27 are examples of the first engagement portion described in the claims, and the downward projection provided on the housing 27. 29 and the engagement hole 30 provided in the recess 28 are examples of the second engagement portion described in the claims. In either case, the rail member 25 and the housing 27 are held so as not to be displaced in any of the up, down, left, and right directions when the upper part is fastened together with the screw 38 in order to be fitted and removed from the up and down direction. Various other fitting modes can be adopted for the first engaging portion and the second engaging portion.

  On the back surface of the rail member 25, as a part of the height adjusting means, a large number of engaging projections 39 are formed side by side in the vertical direction. On the other hand, the clip member 26 is configured to embrace the rail member 25 from the front and the rear, and the portions located behind the rail member 25 are left and right locking claws 40 that engage and disengage with the engagement protrusions 39.

  To be precise, the clip member 26 includes a board located in front of the rail member 25, left and right side plates protruding rearward from both left and right sides thereof, and left and right locking claws 40 integrally provided on the left and right side plates. The rail member 25 is sandwiched between the substrate and the locking claw 40. More specifically, as shown in FIGS. 3 (A), 5 (B), and 5 (C), thinned ribs 25a are vertically formed on the left and right side edges of the rail member 25, while the clip member is formed. The side plate of 26 is formed with a dovetail groove into which a rib is slidably fitted.

  The lower end (tip) of the locking claw 40 is a free end, and the height of the lumbar pad 22 is maintained by the claw portion of the lower end entering between the adjacent engaging protrusions 39. When a vertical external force is applied to the lumbar pad 22, the locking claw 40 elastically deforms and rides over the engagement protrusion 39. Thereby, the height of the lumbar pad 22 can be adjusted stepwise.

  The holder member 24 is arranged inside a surrounding frame 41 formed on the rear surface of the lumbar pad 22. A group of inward ribs 42 is formed on the left and right inner side surfaces of the surrounding frame 41, while outward ribs that are fitted to the inward ribs 42 and are held so as not to be displaced vertically are formed on the left and right outer surfaces of the clip member 27. 43 is formed. Therefore, the clip member 27 is pressed and held by the holder member 24 so as not to shift in any of the up, down, left, right, and front and rear directions.

  For example, as shown in FIG. 3 (B), while flanges 44 are provided on the front surface and the left and right side portions of the holder member 24, as shown in FIGS. 3 (A), 5 (B) and 5 (C). At the left and right sides of the housing 27, stepped portions 45 into which the flanges 44 of the holder member 24 are vertically slidably fitted are formed.

  Further, as shown in FIGS. 3B and 4B, vertically long guide ribs 46 are integrally provided at the left and right intermediate positions on the rear surface of the holder member 24, and left and right engaging ribs are provided at both upper and lower ends of the guide rib 46. While forming 47, the height of the lumbar pad 22 is held on the bottom surface of the housing 27 in cooperation with the guide ribs 46 and the engaging ribs 47, as shown in FIGS. 3 (A) and 5 (A). The lock portion 48 is formed.

  As clearly shown in FIG. 5A, the lock portion 48 forms a center groove 49 into which the guide rib 46 is vertically slidably fitted, and a group of lock grooves 50 into which the engaging rib 47 can be fitted. . The lock groove 50 is formed by vertically arranged lock protrusions 51, and the lock protrusions 51 are integrally formed with the left and right vertically long ribs 52 forming the center groove 49. The lock protrusions 51 are formed at the same height and pitch as the engagement protrusions 39 formed on the rear surface of the rail member 25.

  Then, in a state in which the rearward external force does not act on the lumbar pad 22, the engaging rib 47 is disengaged from the lock groove 50 to the front, and the lumbar pad 22 can be moved up and down. On the other hand, when the pressing force of the seated person acts on the lumbar pad 22, the rail member 25 is bent backward, so that the engaging rib 47 of the holder member 24 fits into the lock groove 50. As a result, the lumbar pad 22 is locked so that it cannot move up and down.

  Now, with the seated person leaning against the backrest 2, vertical slippage may occur between the seated person's back and the backrest 2, and therefore the lumbar pad 22 is unintentionally raised. Or it may fall. However, in the present embodiment, when the seated person leans against the backrest 2, the engaging rib 47 of the holder member 24 is fitted into the lock groove 50 of the housing 27, so that the lumbar pad 22 is held so that it cannot move up and down. .

  Therefore, the engagement rib 47 and the lock portion 48 constitute the lock means described in the claims. However, when the pressing force of the seated person acts, the rail member 25 is elastically deformed and the engagement rib 47 is formed. Strictly speaking, since the rail member 25 engages with the lock portion 48, it can be said that the rail member 25 functions as a spring means and forms a part of the lock means. In order to secure the free state, it is possible to provide a spring that pushes the holder member 24 toward you.

(3). Summary The lumbar support device 5 of the present embodiment uses the housing 27 as a base material and is entirely assembled thereto. That is, the entire unit is a unit via the housing 27. Therefore, the assembling is easy and high dimensional accuracy can be secured.

  Further, since the rail member 25 is built in the housing 27, and most of the housing 27 is built in the recess 78 of the back strut 11, most of the base portion of the lumbar support device 5 is the meat of the back strut 11. It is hidden in the thick part. Therefore, the aesthetics can be improved. It is also possible to reduce the size of the chair by narrowing the distance between the back support 11 and the backrest 2.

  Further, if only the vertical slide of the clip member 26 by the rail member 25 is adopted as the vertical slide means of the lumbar pad 22, since the rail member 25 has a small width, the lumber pad 22 is smoothly lifted and lowered. Although it may be difficult to do so, in the present embodiment, the holder member 24 is held slidably up and down with respect to the housing 27 that is much wider than the rail member 25. The pad 22 can be raised and lowered smoothly.

  In the embodiment, the lower end portion of the rail member 25 is fitted into the housing 27, and the lower end portion of the housing 27 is fitted into the back strut 11, so that the back strut 11 is provided with only one screw 38 for the lumbar support device. Can be fixed to. Therefore, the lumbar support device 5 can be attached efficiently. Further, an external force acts on the lumbar support device 5 in a backward direction, but since this external force is supported by the back strut 11, even if it is fastened by one screw 38, the mounting strength of the lumbar support device 5 is completely uneasy. There is no.

  As described above, if the seated person is provided with the locking means for holding the lumbar pad 22 so that the lumbar pad 22 cannot move up and down with the backrest 2 leaning against the backrest 2, the lumbar pad 22 is prevented from moving (especially slipping down) to improve comfort. Can be improved.

(4). Second Embodiment FIGS. 7 to 10 show a second embodiment applied to a mesh type. That is, the backrest 2 has a structure in which a mesh material 54 is stretched over a back frame 53 that is open at the front and back, and includes a lumbar support device 5, an armrest device 6, and a headrest 7, as in the first embodiment. .

  The lumbar support device 5 of the second embodiment is shown in FIGS. As can be understood from these drawings, the structure of the lumbar support device 5 of the second embodiment is basically the same as that of the first embodiment, but the support structure of the lumbar pad 22 is different from that of the first embodiment. ing.

  That is, in the first embodiment, the holder member 24 is directly fixed to the back surface of the lumbar pad 22, but in the second embodiment, the spacer frame 55 having a bow shape in plan view is attached to the back surface of the lumbar pad 22. The holder member 24 is fixed to the spacer frame 55. Therefore, the rail member 25 and the clip member 26 are arranged between the holder member 24 and the spacer frame 55. Further, the spacer frame 55 is provided with an enclosure frame 41 for holding the clip member 26 in a non-displaceable manner.

  As can be understood from FIG. 10 (A), the left and right end portions of the spacer frame 55 are thin connecting portions 56, while the left and right end portions of the lumbar pad 22 are provided with boss portions 57 into which the connecting portions 56 are inserted. Has been formed. An outward engaging piece 58 is formed at the tip of the connecting portion 56, and an engaging groove 59 into which the engaging piece 58 fits is formed inward at the inner part of the boss portion 57 of the lumbar pad 22. It is formed so as to open.

  The fitting of the engagement piece 58 into the engagement groove 59 can be easily realized by deforming the spacer frame 55 so as to narrow it. Further, the pressing force applied by the seated person acts so as to widen the left-right space of the spacer frame 55, so that the lumbar pad 22 is not detached from the spacer frame 55 by an external force.

  The left and right connecting portions 56 of the spacer frame 55 are connected by a reinforcing frame 60 that overlaps the lower surface portion of the lumbar pad 22. Since the boss portion 57 is located at the upper end portion, the lumbar pad 22 may have a moment to push the lower end backward due to the pressing force of the seated person. However, when the reinforcing frame 60 is provided, the lumber pad 22 is provided. The user's body can be firmly supported without deforming.

  Although the embodiments of the present invention have been described above, the respective inventions of the present application can be variously embodied. For example, the constituent members such as the lumbar pad and the housing can be appropriately changed according to the requirements such as design. When the lumbar pad is of a height adjusting type, it is possible to provide a lock device which is switched between a free state and a locked state by a lever device.

  The present invention can be embodied in a chair equipped with a lumbar support device. Therefore, it can be used industrially.

2 backrest 3 back frame 5 lumbar support device 11 back strut 22 lumbar pad 24 holder member 25 constituting a slider 25 rail member 26 clip member 27 constituting a slider 27 housing 28 recess 29 downward projection 30 constituting a second engaging portion 30 2 Engagement Holes Constituting Engagement Part 34 Engagement Protrusions Constituting First Engagement Part 35 Engagement Grooves Constituting First Engagement Part 39 Engagement Protrusions 40 Engaging Claws 47 Engagement Comprising Locking Means Rib 48 Lock part constituting lock means

Claims (5)

A seat and a backrest, and a back frame to which the backrest is attached.The back frame has a back strut located at a left and right intermediate portion, and the back strut supports the backrest from behind. A configuration in which a support device is attached,
The lumbar support device includes a vertically elongated rail member having height adjusting engagement portions provided in multiple stages, and a lumbar pad attached to the rail member so that the height can be adjusted. Disposed inside a housing housed in a recess formed in the front surface of the back strut,
Chair. A slider to which the lumbar pad is fixed is attached to the rail member so as to be able to move up and down, and the slider is attached to the housing so as to be vertically slidable.
The chair according to claim 1. The lower end of the rail member and the lower end of the housing are provided with a first engaging portion that holds the rail member in a non-displaceable manner, and the lower end of the housing and the lower end of a recess provided in the back column. Is provided with a second engaging portion that holds the lower end of the housing in a non-displaceable manner,
An upper end of the rail member and an upper end of the housing are fastened together with the back strut by a screw.
The chair according to claim 1 or 2. The slider and the housing are separated from each other in a state where the lumbar pad is not pressed by the seated person to allow the slider to move up and down, and when the lumbar pad is pressed by the seated person, the slider is engaged with the slider. Locking means for holding the
The chair according to claim 2 or 3. A seat and a backrest, and a back frame to which the backrest is attached.The back frame has a back strut located at a left and right intermediate portion, and the back strut supports the backrest from behind. A configuration in which a support device is attached,
The lumbar support device includes a case-shaped housing that is fixed to the back column and is vertically long and long, and the lumbar pad is attached to the housing directly or through a rail member.
Chair.

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