JP2019198518A - Lumbar support device for chair - Google Patents

Abstract

To provide a lumbar support device which is compact and excellent in cushion property.SOLUTION: A lumbar support device 23 comprises: a base pat 24 attached to a side member 8 of a back frame 7; and a body support part 25 integrated to a lower end of the base part 24. The body support part 25 comprises: a pad part 26 which contact the back plate 11 from a rear side; and an intermediate part 27 for coupling the pad part 26 and the base part 24, the tip end part of the intermediate part 27 is a curve part 27a which can be elastically deformed. Therefore, the body support part 25 is formed into a collapsed C-shape in plan view. A rear surface of the intermediate part 27 has a knob part 28 which is protruded rearward. Since the curve part 27a is deformed by body pressure, excellent cushion property is acquired. In addition, the pad part 26 can be easily made to come close to a side member 8.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a lumbar support device for a chair.

  Various structures have been proposed for lumbar support devices for chairs. The structure of the lumbar support device is closely related to the structure of the backrest, but as one classification method, there is a type with only one lumbar pad on which the body pressure of the seated person is applied, and two separately on the left and right. Can be divided into two types.

  As a type in which the lumbar pad is separated into left and right, Patent Document 1 discloses that the lumbar pad is pivotably connected to the left and right sides of the back frame in a backrest with mesh material applied to the back frame that is open at the front and back. Is disclosed.

  In Patent Document 1, the left and right lumbar pads are close to the longitudinal center line of the backrest, so that the body pressure of the seated person is directly applied to the lumbar pad, and the lumbar pad is rotated by The height changes.

Japanese Patent No. 5364102

  When the lumbar pad is attached to the back frame as in Patent Document 1, there is an advantage that it can be easily applied to a mesh type backrest. However, the lumbar pad has a structure that firmly supports the body pressure of the seated person, so that the cushioning property is poor, and there is a possibility of giving the user a feeling of pushing up.

  In addition, in order to adjust the height by rotating up and down, a certain amount of span is required, so it is difficult to place the lumbar pad close to the back frame, so by applying tension to the mesh material It is difficult to apply to a type in which the mesh material has a lumbar support.

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide an improved lumbar support device which has not been provided conventionally.

The present invention includes various configurations, and typical examples thereof are specified in the respective claims. Of these, the invention of claim 1 forms a superordinate concept,
"Lumbar support device attached to the back frame or back column,
A base portion that is attached to the back frame or the back column, a pad portion that overlaps a body pressure support body of a backrest from behind, and an intermediate portion that is located behind the pad portion and is connected to the pad portion and the base portion. The intermediate portion has an elastic deformation allowing portion bent in a plan view or a side view so that the pad portion can be retracted by the body pressure of the seated person. ''
It is the composition.

The invention of claim 2 is a development example of claim 1,
"One end of the pad portion is connected to the intermediate portion, and the other end is a free end."
It is the composition.

The invention of claim 3 is the invention according to claim 1 or 2,
“The back frame has left and right side members that are vertically long, and is a left and right separation system that is independently attached to the left and right side members.”
It is the composition.

The invention of claim 4 is the invention according to claim 3,
“The base portion is adapted to be attached to a side member of a back frame, and the intermediate portion and the pad portion are arranged in a state of being brought close to the side member of the back frame, Is formed in J-shape or U-letter in plan view "
It is the composition.

Invention of Claim 5 in any one of back 1-4,
"The base portion is in the form of a vertically long shape that is attached to the back frame so as to be adjustable in height"
That's it.

The invention of claim 6 is the invention of claim 5,
“The base portion is attached to the back frame or the back column so that the height can be adjusted, and a knob portion protruding rearward is provided in the intermediate portion.”
It is the composition.

Invention of Claim 7 in any one of Claims 4-6,
“The side members of the back frame are in the shape of a letter when viewed from the side with a rearwardly inclined part located on the upper side and a forwardly inclined part located on the lower side, and the body pressure support body is in front of the rearwardly inclined part. The base portion is inserted from below into the rear inclined portion of the side member. ''
It is the composition.

The invention of claim 8 forms an independent concept,
"Lumbar support device attached to the back frame or back column,
A base portion that is attached to the back frame or the back column, a pad portion that overlaps a body pressure support body of a backrest from behind, and an intermediate portion that is located behind the pad portion and is connected to the pad portion and the base portion. The intermediate portion is formed in a bent shape in a plan view, a front view, or a side view, and is allowed or not allowed to be elastically deformed by the body pressure of the seated person. ''
It is the composition.

  In the first aspect of the present invention, since the intermediate portion is bent in a plan view or a side view, the front-rear position, the height position, etc. of the pad portion can be easily adjusted by adjusting the degree of bending of the intermediate portion. Therefore, the freedom of design is high. In particular, when the pad portion is arranged close to the left and right side portions of the back frame as in claim 4, it can be ensured that the pad portion is brought close to the side portion of the back frame by turning the intermediate portion inward. Is preferred.

  Moreover, in Claim 1 of this application, since the intermediate part has an elastic deformation | transformation permission part, cushioning property can be improved and a high comfort can be provided for a seated person. The intermediate portion can be entirely formed as an elastic deformation allowing portion, or a part thereof can be an elastic deformation allowing portion that is curved or the like.

  In the structure of Claim 2, material can be saved and it can compact. In addition, since a large moment can be applied to the elastic deformation allowing portion, there is an advantage that the elastic deformation can be facilitated.

  In the structure of Claim 3, since it attaches to the side member of a back frame, similarly to patent document 1, it can apply also to the backrest which is not provided with the back support | pillar. Therefore, versatility is high. In addition, the size and shape of the intermediate part and the pad part can be set arbitrarily, but the present invention has high design freedom and it is easy to bring the pad part to the side member, so the pad part is close to the side member. Thus, it is possible to easily achieve the lumbar support function by applying tension to the mesh material or the flexible inner member.

  Although the form of the body support part can be embodied in various ways, in the type attached to the side member of the back frame as in claim 4, when the intermediate part is formed in J shape or U shape, the intermediate part wraps around inside The pad portion can be brought close to the side member of the back frame. That is, it is possible to easily bring the pad portion close to the side member.

  Therefore, instead of directly supporting the seated person's body with the pad portion, tension is applied to the body pressure support body such as the mesh material or the flexible inner member by the pad portion, so that one of the mesh material and the flexible inner member is provided. It is very easy to give the part a lumbar support function.

  In claim 5, since the height of the lumbar support device can be adjusted, the lumbar support device can accurately correspond to the user's physique and preferences.

  When the lumbar support can be adjusted in height, the body support part can be picked up and down, but when the knob part is provided in the middle part as in claim 6, the knob part is firmly held with fingers. Therefore, it is excellent in operability. In addition, since the knob portion also functions as a reinforcing rib, it can contribute to an increase in rigidity of a portion of the intermediate portion excluding the elastic deformation allowing portion.

  The applicant of the present application, for example, in Japanese Patent Application Laid-Open No. 2011-92538, the side member constituting the spine frame is shaped like a letter when viewed from the side, with the rearwardly inclined part positioned on the upper side and the forwardly inclined part positioned on the lower side. The form which becomes is disclosed. In this structure, the body pressure support is overlapped with the rearward inclined portion from the front, and the forward inclined portion of the side member is exposed to the front. Therefore, the lower part of the back frame is an overhang part that protrudes below the lower end of the rearwardly inclined part of the side member.

  Claim 7 of the present application is applied to the backrest disclosed in Japanese Patent Application Laid-Open No. 2011-92538, and the base portion can be inserted into the rear inclined portion of the side member from below. The lumbar support device can be attached to the side member while ensuring the attachment of the body pressure support such as the inner member. Moreover, since the base part is located in the space between the side member and the body pressure support body, the aesthetics can be improved without making the lumbar support device as conspicuous as possible.

  The invention of claim 8 is the same as that of claim 1 and can improve the freedom of arrangement of the pad portion. Further, if an elastic deformation allowing portion is provided in the intermediate portion, the cushioning property can be improved and the satisfaction of the seated person can be improved.

It is a figure which shows the chair to which 1st Embodiment is applied, (A) is a partially broken front view, (B) is a rear view, (C) is a separate front view. (A) is a side view of a chair, (B) is a separated perspective view of a backrest. (A) is the partial perspective view which looked at the principal part from back, (B) is the partial isolation | separation perspective view which looked at the principal part from back. It is the rear view which displayed the backplate and the lumbar support apparatus. (A) is a separated rear view, and (B) is a separated side view. (A) is the isolation | separation perspective view of a lumbar support apparatus and a back frame, (B) is the isolation | separation schematic top view which looked at the back frame and the backplate from the VIB direction of FIG. It is the bottom view which isolate | separated the back frame and the backplate. (A) is a sectional view taken along line VIIIA-VIIIA of FIG. 7, and (B) is a sectional view taken along line BB of (A). It is a schematic diagram which shows 2-6 embodiment. It is a schematic diagram which shows 7th-11th embodiment. It is a schematic diagram which shows 12th and 13th embodiment.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a chair disclosed in the aforementioned Japanese Patent Application Laid-Open No. 2011-92538. In the present embodiment, front / rear / left / right words are used to specify a direction, and the front / rear / left / right are as viewed from a person who normally sits on a chair. The front view direction is the direction facing the seated person.

(1). Outline of Chair First, an outline of a chair to which the first embodiment is applied will be described. The chair is a rocking-type swivel chair often used in males, and includes a leg device 1, a seat 2, and a backrest 3 as main elements.

  As shown in FIG. 2, the leg device 1 is provided with a caster, and a tilting member in which a support base 5 is fixed to the upper end of a leg column 4 standing at the center of the leg device 1 and is connected to the support base 5 in a freely tiltable manner. A back frame 7, which is a component of the backrest 3, is fixed to 6. The seat 2 tilts slightly backward while retracting in conjunction with the locking of the backrest 3.

  The back frame 7 basically has a substantially quadrangular shape that opens in the front-rear direction. Accordingly, the left and right side members 8 that are vertically long, the upper member 9 that is connected to the upper end thereof, and the left and right side members 8 The lower member 10 is connected to the lower end, and a forward arm portion 8c is provided at the lower end of the back frame 7, and the forward arm portion 8c is fixed to the tilting member 6.

  A back plate 11 is attached to the front surface of the back frame 7, and a thin cushion plate (not shown) and a skin material (tension) 12 are arranged on the back plate 11. The back plate 11 has a substantially rectangular outer peripheral frame portion 13 and a multistage strip-shaped support portion 14 integrally connected to the outer peripheral frame portion 13. It is connected by a bridge portion 15 at a close portion.

  For example, as clearly shown in FIG. 5, the bridge portion 15 has a U-shape when viewed from the front. Therefore, a substantially L-shaped slit 16 is formed in the belt-like support portion 14 in order to form the bridge portion 15. The bridge portions 15 adjacent to each other in the vertical direction are staggered so as to be alternately shifted in the horizontal direction.

  As clearly shown in FIG. 2, the side member 8 of the back frame 7 has a rearwardly inclined part 8a occupying more than half of the upper side and a forwardly inclined part 8b connected to the lower end thereof. It is in the form of a letter. On the other hand, the back plate 11 has a curved portion 11a that is recessed forward in a plan view and protrudes forward in a side view. The apex of the curved portion 11 a of the back plate 11 is positioned below the apex 18 of the side member 8. Therefore, most of the curved portion 11 a of the back plate 11 is located below the apex 18 of the side member 8. The lower end of the back plate 11 is a free end and is not fixed to the back frame 7.

  For example, as shown in FIG. 2B, the side members 8 and the upper member 9 of the back frame 7 are formed with long grooves 20 and 21 that open forward. On the other hand, although details are omitted, positioning boss bodies and engaging claws that enter the long grooves 20 and 21 of the back frame 7 are formed on the left and right sides and the upper portion of the back plate 11. The back plate 11 is attached to the back frame 7 by engaging the engaging claws of the back plate 11 with the engaging portions.

(2) Lumber support device For example, as shown in FIG. 2, a lumbar support device 23 made of resin is attached to a rearward inclined portion 8 a of the side member 8 constituting the back frame 7. The lumbar support device 23 has a base plate 24 that is vertically long and is inserted into the rear inclined portion 8 a of the side member 8 from below, and a body support portion 25 that is integrally provided at the lower end of the base portion 24. ing.

  For example, as shown in FIG. 6 (B), the body support portion 25 includes a pad portion 26 that contacts the back surface of the back plate 11 and an intermediate portion 27 that is connected to the pad portion 26 and the base portion 24. A plate-like knob portion 28 is provided on the portion 27 so as to protrude rearward. The lumbar support device 23 is formed of polycarbonate, nylon resin, or the like, but may be transparent or translucent.

  The pad part 26 is gently curved in a forward convex shape in plan view. On the other hand, the intermediate portion 27 is curled so as to be wound inwardly in a plan view while the portion on the opposite side to the base portion 24 is gently curved in a concave shape facing forward. Accordingly, the intermediate portion 27 has a J-shape in plan view having the curved portion 27a, and the curved portion 27a is an elastic deformation allowing portion that can be elastically deformed by the body pressure of the seated person.

  An end (tip) of the pad portion 26 opposite to the intermediate portion 27 is a free end. Accordingly, the body support portion 25 including the pad portion and the intermediate portion 27 has a planar view shape as if the C-shape is crushed as a whole. For example, as shown in FIG. 5B, the pad portion 26 is gently curved so as to swell forward in a side view. In this case, the rear surface is curved with the same thickness as the pad portion 26, but it is also possible to gently curve only the front surface by varying the thickness.

  The body support portion 25 is shaped like a band plate. For example, as can be clearly understood from FIG. 4, the vertical width W1 of the pad portion 26 (and the intermediate portion 27) is a band shape on the back plate 11. It is about twice the vertical width W2 of the support portion 14. Moreover, it is a dimension a little larger than the space | interval dimension W3 of the space 30 between the strip | belt-shaped support parts 14 adjacent up and down.

  Further, the pad portion 26 is disposed at a position overlapping the bridge portion 15 of the back plate 11. If the body pressure of the seated person is applied to the back plate 11, the space 30 between the belt-like support portions 14 adjacent to each other in the vertical direction may expand. However, since the pad portion 26 hits the bridge portion 15, the pad portion 26 is a space. I won't go into 30.

  For example, as shown in FIG. 6B, the knob portion 28 is provided on the entire portion of the intermediate portion 27 excluding the curved portion 27 a and is also connected to the base portion 24. Therefore, the knob portion 28 exhibits the reinforcing effect of the lumbar support device 23 and increases the rigidity of the portion composed of the intermediate portion 27 and the base portion 24.

  As shown in FIG. 8, the base portion 24 enters the guide groove 31 formed in the rearward inclined portion 8a of the side member 8 so as to be movable up and down from below. A large number of engagement recesses 32 are formed on the rear surface of the base portion 24, while the rear inclined portion 8 a of the side member 8 resists the engagement recess 32 against elasticity. The engaging claw unit 33 to be fitted and detached is attached. The engaging claw unit 33 is attached to a recess 34 formed in the guide groove 31.

  A guide frame 35 is mounted in the guide groove 31 to cover the base portion 24 from the front side and the left and right sides. The guide frame 35 restricts the base portion 24 so as to move only up and down, and is held on the rear inclined portion 8a of the side member 8 so as not to be detached by screws or engaging claws. Alternatively, it can be held by the back plate 11. The base portion 24 may be held so as not to move forward by a simple lid.

(3). Summary In the present invention, as clearly shown in FIG. 7, the pad portion 26 of the lumbar support device 23 is largely close to the side member 8. Specifically, the distance dimension L1 from the longitudinal center line 36 of the backrest 3 to the inner end of the pad part 26 is considerably larger than the distance dimension L2 from the inner end of the pad part 26 to the side member 8.

  Therefore, the body pressure of the seated person M is hardly applied directly to the pad portion 26, and the lumbar support function is exhibited by the belt-like support portion 14 of the back plate 11. That is, by applying tension to the belt-like support portion 14 having a specific height with the pad portion 26, the belt-like support portion 14 having a specific height is moved forward to exert the lumbar support function. Therefore, the hit against the seated person M is soft and there is no feeling of tension.

  In order to exert such a lumbar support function, it is necessary that the belt-like support portion 14 be pushed and bent by the pad portion 26. However, since the base portion of the belt-like support portion 14 is difficult to deform, The end is located inside the side member 8 by a certain dimension L3.

  Although it has already been described that the pad portion 26 does not enter the space 30, the vertical width W1 of the pad portion 26 is only slightly larger than the width W2 of the space 30, so the curved portion 11a of the back plate 11 is In other words, it can be transformed into a pointed state in side view. For this reason, a firm lumbar support function can be provided.

  Further, when a backward load is applied to the pad portion 26 via the back plate 11, the curved portion 27a of the intermediate portion 27 is elastically deformed, so that an appropriate cushioning property can be ensured. Thereby, a seated person's comfort can be improved.

(4). Other Embodiments Next, other embodiments shown in FIG. 9 and the following will be described. In the following embodiment, the backrest 3 has a structure in which a mesh material 37 is stretched on the back frame 7. Among these, in the second embodiment shown in FIG. 9A, the intermediate portion 27 and the pad portion 26 are connected in a loop shape. Also in this case, high cushioning properties can be ensured by utilizing the deformation of the curved portion 27a of the intermediate portion 27.

  In the third embodiment shown in FIG. 10B, the pad portion 26 extends inward from the proximal end portion of the body support portion 25. Also in this example, since the inner end of the pad part 26 is a free end, it can be easily bent and deformed. In the fourth embodiment shown in FIG. 9C, the intermediate portion 27 is bent in a U shape in plan view, and the pad portion 26 is connected to the tip thereof. In this example, the intermediate portion 27 is easily elastically deformed.

  9D and 9E, the lumbar support device 23 is a left-right integrated system. That is, the base part 24 is provided at each of the left and right ends of the left and right longitudinal intermediate part 27, and the left and right pad parts 26 project forward. In the fifth embodiment of (D), the left and right pad portions 26 are oriented outward, and in the sixth embodiment shown in (E), the left and right pad portions 26 are arranged so as to open to each other. It is in a posture. In the seventh embodiment shown in FIG. 10A, the pad portion 26 and the intermediate portion 27 form a loop structure.

  In the eighth embodiment shown in FIG. 10B, in the left-right integrated system, the left and right intermediate portions 27 that are substantially L-shaped in plan view are connected by a single pad portion 26, and therefore the body support portion 25 as a whole. It has a crank shape.

  In the ninth to eleventh embodiments of FIGS. 10C to 10E, the lumbar support device 23 is attached to the back column 38. In the ninth embodiment shown in (C), the left and right pad portions 26 are formed so as to spread outward, and in the tenth embodiment shown in (D), the left and right pad portions 26 are directed inward. Is formed.

  Moreover, in 11th Embodiment shown to (E), the pad part 26 has one loop structure. The body support part 25 can be adjusted in height. Although only one back column 38 is displayed, when the back column 38 is arranged on the left and right, the base portion 24 may be attached to a bracket fixed to the left and right back column 38.

  In the twelfth to thirteenth embodiments shown in FIG. 11, the intermediate portion 27 has a bent shape in front view. Of these, in the twelfth embodiment shown in (A), in the left and right separation system attached to the left and right side members 8, the intermediate portion 27 is bent from the inward direction to the downward direction and from the upward direction.

  On the other hand, in 13th Embodiment shown to (B), in the example which attached the base part 24 to the back support | pillar 38, the intermediate part 27 on either side is bent in the L shape. In any case, when a rearward external force is applied to the pad portion 26, the intermediate portion 27 can be easily elastically deformed, so that cushioning properties can be ensured. Further, the elastic force can be easily set (trimming is easy) by adjusting the length and thickness of the intermediate portion 27 and the like.

  The embodiment of the present invention has been described above, but the present invention can be embodied in various ways. When the intermediate portion is elastically bent and deformed, the elastic deformation allowing portion may be formed at any portion. It is also possible to elastically deform the entire intermediate portion.

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

3 Backrest 7 Back frame 8 Side member 8a Back tilt part 11 Back plate (inner plate)
DESCRIPTION OF SYMBOLS 12 Skin material 14 Strip | belt-shaped support part 15 Bridge part 18 Forward apex of back frame 19 Forward apex of back board 23 Lumber support apparatus 24 Base part 25 Body support part 26 Pad part 27 Intermediate part 27a Bending part which is elastic deformation allowable part 38 Back Prop

Claims (8)

A lumbar support device attached to a back frame or a back column,
A base portion that is attached to the back frame or the back column, a pad portion that overlaps a body pressure support body of a backrest from behind, and an intermediate portion that is located behind the pad portion and is connected to the pad portion and the base portion. The intermediate portion has an elastic deformation allowing portion bent in a plan view or a side view so that the pad portion can be retracted by a body pressure of a seated person,
Chair lumbar support device. One end of the pad portion is connected to the intermediate portion, and the other end is a free end.
The lumbar support device for a chair according to claim 1. The back frame has left and right side members that are vertically long, and is a left and right separation system that is independently attached to the left and right side members.
The lumbar support device for a chair according to claim 1 or 2. The base part is adapted to be attached to a side member of the back frame, and the intermediate part and the pad part are arranged in a state of being brought close to the side member of the back frame, and the intermediate part is , J-shaped or U-shaped in plan view,
The lumbar support device for a chair according to claim 3. The base part is in the form of a vertically long shape attached to the back frame so that the height can be adjusted.
The lumbar support device for a chair according to any one of claims 1 to 4. The base part is designed to be attached to the back frame or the back column so that the height can be adjusted, and the intermediate part is provided with a knob part protruding rearward.
The lumbar support device for a chair according to claim 5. The side member of the back frame has a shape of a letter when viewed from the side with a rearwardly inclined part located on the upper side and a forwardly inclined part located on the lower side, and the body pressure support body is in front of the rearwardly inclined part. Overlapped, the base portion is inserted into the rear tilt portion of the side member from below,
The lumbar support device for a chair according to any one of claims 4 to 6. A lumbar support device attached to a back frame or a back column,
A base portion that is attached to the back frame or the back column, a pad portion that overlaps a body pressure support body of a backrest from behind, and an intermediate portion that is located behind the pad portion and is connected to the pad portion and the base portion. The intermediate part is formed in a bent shape in a plan view or a front view or a side view, and is allowed or not allowed to be elastically deformed by the body pressure of the seated person,
Chair lumbar support device.

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