JP2006181205A - Chair - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chair having a structure that a net-like back sheet is applied to a back frame in which the fitting and cushioning properties of the backrest are improved. <P>SOLUTION: The back sheet 14 is formed in a bag form, and its inside is disposed with a plate-like support 16 fixed to the right and left side members 13a of the back frame 13 and a lumbar support 15 located on this side of the plate-like support 16. The plate-like support 16 can be flexibly changed in shape so as to sink backward by the body pressure of a a seated person. High fitting and cushioning properties can be secured by two actions of elastic deformation of the back sheet 14 and the plate-like support 16. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a chair.

  Chair backrests and seats come in a variety of structures, but office swivel chairs generally use a structure in which a cushion is stretched on a synthetic resin shell and a structure in which a net is stretched over a frame. ing.

Moreover, in any type, a lumbar support for pushing the seated person's waist and back partly strongly is provided for the backrest. Patent Document 1 is an example of a lumbar support provided on a backrest having a structure in which a net is stretched on a back frame.
JP 2004-49657 A

  By the way, when looking at the back of the chair, it is necessary to improve the cushioning property of the back to improve the sitting comfort when leaning on the back. In this regard, in a structure in which a cushioning material is stretched on a resin back plate (inner shell), the cushioning property can be improved by adopting a structure in which the back plate is bent and deformed by the body pressure (backrest load) of the seated person. It has been broken.

  In this case, the back plate is generally fixed to the back column, and therefore the back plate is deformed so that the left and right side portions sandwiching the longitudinal center line bend backward. More specifically, the back plate is generally curved in a forward-facing concave shape (bow shape) in plan view, but the back plate is deformed so as to approach flatness due to the backrest load of the seated person, so that it moves backward as a whole. Therefore, there was a case where the cushioning property was inferior.

  On the other hand, in the case of a chair having a structure in which a back seat is stretched on the back frame as in Patent Document 1, the back seat has some elasticity so as to extend due to the seat back load. When leaning against it, the back sheet extends and deforms so as to sink backward. However, since the back seat is attached to the back frame in a tensioned state, the back seat has a poor function of wrapping the occupant's body, and the seating comfort may not be improved in this respect.

  Further, in Patent Document 2, the lumbar support is attached to a support fixed to the back frame. However, since the support has a rigid structure, there is a case where the lumbar support is too strong to be pushed up.

  This invention makes it a subject to improve such a present condition.

  The inventor of the present application created the structure of each claim in order to solve the above-described problems. Of these, the invention according to claim 1 is a chair having a structure in which a backrest or a seat or both are supported by a frame that is open on the front and back, and the body receiving portion is at least subjected to the body pressure of the seated person. And a plate-like support body that is elastically deformed so as to sink in the action direction of the body pressure, and a peripheral portion of the plate-like support body is attached to the frame.

  According to a second aspect of the present invention, in the first aspect, the body receiving portion includes a sheet-like support body having flexibility (that is, foldable) in addition to the plate-like support body. The body pressure is supported by the plate-like support via the sheet-like support.

  Invention of Claim 3 applies the invention of Claim 2 to a backrest, The said frame is a back frame which comprises a backrest, Comprising: On the front surface or back surface of the said plate-shaped support body, Lumber support that pushes the back intensively is arranged.

  According to the invention of claim 1, in the backrest or seat of the frame structure, the body of the seated person is supported by a plate-like support body that is elastically deformed, and the peripheral edge portion of the plate-like support body is attached to the frame. Thus, the plate-like support body is deformed so as to sink backward as a whole in the case of a backrest, and is deformed so as to sink downward as a whole in the case of a seat. For this reason, a feeling of high fit can be given to the seated person and the sitting comfort can be improved. Moreover, since a plate-shaped support body can be manufactured in a shape that fits a human body in advance, the fitting property can be improved as compared with a case where it is supported only by a net-like back sheet.

  When the sheet-like support and the plate-like support are used in combination as in claim 2, the sheet-like support is made to be elastically deformable as compared with the case where the sheet-like support is used alone, thereby providing a higher fit. Cushioning properties can be secured, which is more preferable.

  In addition, when the lumbar support is provided by applying to the backrest as in claim 3, the lumbar support also moves backward against the elasticity due to the backrest load of the seated person, so the seat does not feel excessively pushed up by the lumbar support. A comfortable sitting comfort can be provided to the person.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to the backrest of a chair.

(1) Outline of First Embodiment FIGS. 1 to 10 show the first embodiment. 1 is an overall perspective view of the chair, FIG. 2A is a front view, FIG. 2B is a partial rear view, and FIG. 3 is a left side view. As can be understood from these drawings, the present embodiment is applied to a rotating chair for office use or the like (of course, it can also be applied to a non-rotating chair such as a pipe chair or a fixed chair such as a lecture chair). The chair includes a leg 1 having casters and a gas cylinder type pedestal, a support base 2 fixed to the upper end of the pedestal, a seat 3 and a backrest 4.

  The support base 2 has a box-like shape that opens upward, and an intermediate support 5 is attached (connected) to the front portion thereof by a first shaft 6 that is long in the left-right direction. The support 5 is mounted so that the front-rear position can be adjusted. Further, a back support member 7 is connected to a substantially middle portion in the front and rear of the support base 2 so as to be tilted rearward by a second shaft 8 that is long in the left and right direction. A long third shaft 9 is connected to be relatively tiltable.

  Although not described in detail, the first shaft 6 is inserted into the support base 2 so as to be movable back and forth, and the first shaft 6 is rearwardly moved by a spring (not shown) disposed inside the support base 2. It is supported. For this reason, the seat body 3 moves backward while being tilted in synchronization with the back tilt of the backrest 4 (synchronized).

  The back support member 7 and the support base 2 are connected by a gas cylinder 10, and the backrest 4 is disposed on the outer surface side of the back support member 7 by switching the gas cylinder 10 between a locked state and a free state. By the turning operation of the lever 11, it is possible to switch between a free state in which the lever 11 tilts freely and a locked state in which the lever 11 cannot be tilted backward in an arbitrary posture. Although not shown, the front end portion of the gas cylinder is pivotally attached to a bracket protruding from the rear end portion of the support base with a pin.

  As shown in FIGS. 2B and 3, a recess (or step) 24 that opens rearward and downward is formed in the left and right rear portions of the back support member 7, and the gas cylinder 10 is operated in the recess 24. A lever 11 is arranged. With this configuration, the lever 11 can be prevented from protruding to the outside of the back frame 13, so that appearance can be prevented and, for example, human clothes can be prevented from being caught on the lever 11, and the operation portion 15 a of the lumbar support 15 can be prevented. There is an advantage of avoiding interference with.

  The lever 11 can also employ a rotating structure indicated by a one-dot chain line in FIG. That is, the lever 11 is attached to an eccentric shaft 11c parallel to the central shaft 11a, and the eccentric shaft 11c and the central shaft 11a are connected by the connecting body 11b, thereby forming a crank-like rotation structure as a whole. The central shaft 11a is rotatably attached to the back support member 7 via a bearing. In this case, the recess 24 is not necessarily formed in the back support member 7. Needless to say, the lever 11 may be provided on one side of the back support member 7 (generally, the right side is more frequent).

  The backrest 4 includes a back frame 13 including a side member 13 a and an upper member 13 b connected to the upper end of the side member 13 a, and a bag-like back back sheet 14 that covers the back frame 13. The back frame 13 constitutes the outer shape of the backrest 4, and the portion surrounded by the back frame 13 is opened and opened in the front and rear to form a space (for example, the middle connecting the left and right side members 13 a at the height position in the vertical direction) May have members).

  The back seat 14 includes a front surface portion 14a on which a seated person's back hits and a back surface portion 14b located on the back side, and a space is left between the two. In the space between the front surface portion 14a and the back surface portion 14b, a lumbar support 15 that mainly supports the lumbar vertebra of the seated person is disposed so as to be movable up and down. The lumbar support 15 is attached to a plate-like support 16 disposed on the back side thereof so as to be movable up and down. In the present embodiment, the plate-like support body 16 and the back sheet 14 constitute a body receiving portion.

  The lumbar support 15 is provided with an operation portion (arm portion) 15a exposed to the outside of the back seat 14, and the operation portion 15a of the lumbar support 15 is provided at the left and right side lower portions (lower corner portions) of the back seat 14. A notch 17 is formed for exposure.

  The upper member 13b of the back frame 13 is configured as a separate member from the side member 13a. However, the side member 13a and the upper member 13b may be a single member.

(2) Details of the backrest Next, the details of the backrest will be described with reference to FIG. 4 and subsequent drawings. 4 (A) is a front view with the back sheet omitted, FIGS. 4 (B) and 4 (C) are cross-sectional views showing examples of mounting the plate-like support 16, and FIG. 5 is a perspective view of the back support member 7. 6A is a side sectional view showing the attachment state of the back sheet 14, FIG. 6B is a view showing the attachment procedure of the back sheet 14, and FIG. 7A is a sectional view taken along the line VIIIA-VIIIA in FIG. 2B is a sectional view taken along the line VIIIB-VIIIB of FIG. 2, FIG. 8A is an exploded perspective view of the lumbar support 15 and its plate-like support 16, and FIG. The perspective view of the state attached to the support body 16, (C) is CC sectional view taken on the line of (B), (A) is the principal part rear view of the plate-shaped support body 16 and the lumbar support 15, among FIG. B) is a partial perspective view of the lumbar support 15, FIG. 10A is a sectional view taken along line XIIA-XIIA in FIG. 10, and FIG. FIG. 11C is a cross-sectional view taken along the line XIIB-XIIB, FIG. 10C is a cross-sectional view taken along the line XIIC-XIIC in FIG. 10, and FIG.

  As can be easily understood from FIG. 5, the back support member 7 includes left and right forward arms 7 a, and a bridge-like bracket 22 is fixed to the upper surface of the arms 7 a with screws. The back support member 7 has its left and right arms 7 a connected to the support base 2 by the second shaft 8, and the third shaft 9 is held by a bearing member (not shown) attached to the bridge-like bracket 22. . The third shaft 9 can also be directly connected to the back support member 7.

  The back support member 7 is a metal integrally molded product such as an aluminum die-cast, and its rear part is a flat part 7b, and a rear wall part 7c that protrudes up and down at the rear end of the flat part 7b. It is formed to extend over the entire length. On the front side of the rear wall portion 7c of the upper surface of the flat portion 7c, a bank portion 7d separated from the left and right is projected upward, and the lower end of the backsheet 15 is between the bank portion 7d and the rear wall portion 7c. It is the edge member fixing | fixed part 7e for fixing.

  Standing portions 7 f for attaching the side members 13 a of the back frame 13 are provided at the rear portions of the left and right ends of the back support member 7. The standing portion 7 f has the same planar shape as the side member 13 a of the back frame 13, and the side member 13 a is fixed to the standing portion 7 f via the connecting shaft 23. The side member 13a of the back frame 13 is manufactured from a hollow pipe having an elliptical cross section, and a core body (not shown) for fitting the connecting shaft 23 is fixed inside the lower end thereof.

  Although details are omitted, the back support member 7 is opened downward, and a metal fitting 25 for attaching the gas cylinder 10, an operation shaft for operating the gas cylinder 10, and a bearing for holding the operation shaft therein. Members are arranged.

  The standing portion 7f of the back support member 7 and the side member 13a of the back frame 13 are held on the connecting shaft 23 so as not to be detached by screws. The upper member 13b and the side member 13a of the back frame 13 are connected via a core body (not shown) penetrating both. The back frame 13 can be integrated with the back support member 7. Conversely, the back support member 7 can be formed of a plurality of parts, and the back support member 7 can be made of sheet metal or resin.

  The back sheet 14 is manufactured using a woven or knitted fabric having an appropriate gap as a raw material, and the left and right side portions of the front surface portion 14a and the back surface portion 14b are integrally connected by sewing or fusion. As shown in FIGS. 6 and 7, the lower end edge of the front surface portion 14a and the lower end edge of the back surface portion 14b are respectively an arcuate member (a crescent shape with a loose curvature) formed from a resin plate or a metal plate. 20 and 21 are fixed so as not to be detached by sewing (may be welding or adhesion). The edge members 20 and 21 are set to dimensions that fit in a state where the edge members 20 and 21 are hardly displaced from the edge member fixing portion 7e in the back support member 7.

  As shown in FIGS. 5 and 6, in the present embodiment, a plurality of (four) bolts (screw shafts) 31 are protruded downward at right and left intervals on the edge member 20 fixed to the front surface portion 14 a, while the back surface A through hole 32 through which the bolt 31 passes is formed in the edge member 21 fixed to the lower end of the portion 14b, and the mounting hole 33 provided in the back support member 7 with the both edge members 20 and 21 overlapped. The two edge members 20 and 21 are fastened together with the back support member 7 by screwing nuts 34 into the bolts 31 from above. Of course, the back sheet 14 may be fixed to the back support member 7 by other methods.

  The plate-like support 16 is made of a synthetic resin and is horizontally long and narrows in the vertical width as it goes to the middle portion. Moreover, as an example of the weakening means for facilitating the bending deformation, four legs 16a are formed by forming outward recesses on the left and right ends and forming the left and right ends into a bifurcated shape. (That is, it is formed in a substantially horizontally long X shape in front view), and the tip of each foot portion 16a is attached to the side member 13a of the back frame 13. The plate-like support body 16 has a flexible structure that can be bent and deformed in the front-rear direction. For this reason, the plate-like support body 16 also bears the cushioning property of the backrest 4.

  As shown in FIG. 4B, the plate-like support 16 is attached to the front surface of the side member 13a with a screw 16b, but as shown in FIG. It is also possible to fix the bracket 16c to the inner surface or the back surface of the member 13a by welding or the like, and to fix the bracket 16c to the front surface or the back surface of the bracket 16c with screws 16b.

  The lumbar support 15 is made of a synthetic resin. As can be understood from FIGS. 7 and 8, for example, the support portion of the lumbar support 15 that contacts the body of the person sitting is elliptical in front view and curved in a forward concave shape in plan view. An operating arm 15b extending left and right is integrally formed at the lower portion of the support portion, and the tip of the operating arm 15b is exposed from the notch 17 of the back seat 14 as the operating portion 15a.

  Further, as a guide means for supporting the lumbar support 15 so as to be movable up and down, the plate-like support 16 is formed with a vertically long guide groove 36 and a second protrusion 37 positioned below the guide groove 36, and on the back surface of the lumbar support 15. A pair of left and right guide rails 39 are formed to hold the first protrusion 38 with the head 38a fitted in the guide groove 36 and the second protrusion 37 of the plate-like support 16 so as not to be laterally displaced. In the present embodiment, the guide groove 36 and the first protrusion 38 constitute main guide means, and the second protrusion 37 and the guide rail portion 39 constitute auxiliary guide means.

  The first protrusions 38 have a thickness that can be slidably fitted into the guide groove 36 in the upper and lower sides (may be formed as a single plate-like support body that is long in the vertical direction). The outer diameter is larger than the groove width. The head 38 a is formed in a circular shape when viewed from the front, and the plate-like support 16 has a circular window hole communicating with the lower end of the guide groove 36 in order to allow the head 38 a to be fitted into the plate-like support 16. 40 is open.

  In this case, a tongue piece 40a that is separated from the inner peripheral surface of the window hole 40 at an interval is formed inside the window hole 40 so that the upper end is a free end and the lower end is a root, And the base 40a of the lower end of the tongue piece 40a is formed narrowly. In other words, the tongue piece 40a is formed in a fan shape.

  The lumbar support 15 can be attached to the plate-like support 16 by one-touch by inserting the first protrusion 38 into the window hole 40 against the elasticity of the tongue piece 40 and sliding it upward. Since the tongue piece 40a of the plate-like support 16 is elastically deformed, there is no hindrance to the insertion of the first protrusion 38, and when the first protrusion 38 is slid upward, the tongue piece 40a returns to the original posture. Even if the first protrusion 38 is lowered, it does not enter the window hole 40 (that is, the tongue piece 40a functions as a stopper). Therefore, even if the lumbar support 15 is lowered to the lower end, it does not come off.

  On the left and right sides of the lumbar support 15 sandwiching the first protrusions 38, claws 41 facing rearward in a side view are formed, while the plate-like support 16 is formed with an uneven portion 42 on which the tip of the claw 41 hits. . The left and right sides of the claw 41 are divided by the slits 43, and thus can move in the front-rear direction against elasticity. For this reason, the height of the lumbar support 15 can be adjusted stepwise with a light force.

  The operation portion 15a of the lumbar support 15 protrudes to the outside of the side member 13a of the back frame 13, and the protruding portion is formed in a convex shape like a rearward projection. This is because the operation unit 15a is given a certain volume so that it can be easily grasped by the user, and the vertical movement is guided by placing the hook-shaped portion against the outer surface of the side member 13a. The operation portion 15a may be configured not to protrude from the side member 13a. In this case, the operation portion 15a may remain flat or may be formed in a forward convex shape.

  In the above configuration, when a seated person leans against the backrest 4, the body pressure (swing load) of the person acts on the back seat 14, and a part of the backrest load is supported by the plate support via the lumbar support 15. 16 is supported. And, for example, as shown by the one-dot chain line in FIG. 10 (B), the plate-like support 16 is elastically deformed so as to sink backward as a whole, so that high fit and cushioning can be given to the seated person, As a result, it is possible to obtain a comfortable sitting comfort without an excessive push-up feeling.

  In addition, when a person uses a chair, the user often performs a work (for example, operation of a personal computer) in a posture in which the upper body is substantially upright by placing the waist on the lumbar support 15 without leaning on the backrest 4 and locking it. (In fact, there are many such use modes). In this state, the lumbar support 15 can be slightly retracted against the elasticity of the plate-like support 16, thereby eliminating the feeling of tension and obtaining a comfortable sitting comfort. Can do.

  When the back sheet 14 and the plate-like support 16 are used together as the body receiving portion, the backrest load is supported by the back sheet 16 over a wide area, and therefore the plate-like support 16 is located only at the lumbar support 15. As long as the vertical width is small.

(4). Second embodiment (FIG. 11)
FIG. 11 shows a second embodiment of the present invention. Also in this example, the back sheet 14 is formed in a bag shape, and a plate-like support 16 made of a synthetic resin and a lumbar support 15 are arranged in a hollow portion of the back sheet 14. A large number of slits 46 are formed in the plate-like support 16 as deformation facilitating means, and the left and right end portions and the lower portion are fixed to the side member 13 a of the back frame 13 via brackets 47. The left and right sides of the plate-like support 16 have a rigid structure that hardly bends and deforms.

  In this embodiment, the lumbar support 15 has a rigid structure that hardly bends and deforms unlike the first embodiment, and the lumbar support 15 is disposed on the back side of the plate-like support 16. Although not shown in the drawing, in this example, the first protrusion 38 is formed on the plate-like support 16, and the guide hole 36 is formed on the lumbar support 15. Further, as conceptually indicated by reference numeral 48, guide means composed of upper and lower longitudinal rails are arranged on both the left and right sides with the vertical center line interposed therebetween.

  The guide means composed of the guide hole 36 and the first protrusion 38 described in the first embodiment, or the auxiliary guide means composed of the second protrusion 37 and the guide rail portion 39, is provided on the plate-like support 16 and the operation arm 15b. You may form in a left-right part, and may form in three places, a left-right both-sides part, and an intermediate part. Further, a long groove may be employed instead of the guide rail portion. In short, the guide portion of the lumbar support 15 and the guide of the support body are fitted to each other and may be moved relative to each other in the vertical direction.

(5). Third to fourth embodiments (FIGS. 12 to 13)
FIG. 12 shows a third embodiment which is a modification of the plate-like support. In this embodiment, the plate-like support 16 is formed in a wide area such that there is a slight gap between the plate-like support 13 and the recess 16d that opens outwardly as an example of the deformation facilitating means. Is forming. The back seat | sheet 14 is provided similarly to the said both embodiment.

  Note that the back sheet 14 and the plate-like support 16 may be in close contact with each other with no load applied, or set so that the back sheet 14 contacts the plate-like support 16 after the backrest load is applied. You can leave it. Further, the position where the plate-like support 16 is attached to the back frame 13 is not particularly limited, and may be attached to the upper member 13b and the rear member 13c of the back frame 13 or attached to the four corners of the back frame 13. You may do it.

  The fourth embodiment shown in FIG. 13 is another example of means for facilitating the deformation of the plate-like support 16, and in the example shown in (A), the curved portion 16 e is provided on the side edge of the plate-like support 16. Forming. Moreover, in the example shown to (B), the space | interval is provided between the front surface of the side member 13a, and the plate-shaped support body 16. As shown in FIG.

(6). Others The present invention can be embodied in various ways other than the above embodiment. For example, a back sheet is not necessarily required, and a structure in which a cushion material is stretched on a plate-like support may be used. For example, when applying to a backrest, it is also possible to arrange | position a several plate-shaped support body separately on upper and lower sides.

It is a perspective view of the chair concerning a 1st embodiment. (A) is a front view of a chair, (B) is a partial rear view. It is a side view of a chair. (A) is a front view in a state where a back sheet is omitted, and (B) and (C) are views showing a method for attaching a plate-like support. It is a perspective view of a back support member. (A) is a side sectional view showing a state of attachment of the back sheet, (B) is a view showing the attachment procedure of the back sheet. (A) is a sectional view taken along the line VIIA-VIIA in FIG. 2, and (B) is a sectional view taken along the line VIIB-VIIB in FIG. (A) is a separated perspective view of the lumbar support and the plate-like support, (B) is a perspective view of the state in which the lumbar support is attached to the plate-like support, and (C) is a sectional view taken along the CC line of (B). . (A) is a principal part rear view of a support body and a lumbar support, (B) is a partial perspective view of a lumbar support. (A), (B), and (C) are cross-sectional views taken along lines XA-XA, XB-XB, and XC-XC in FIG. 9, and (D) is a cross-sectional view taken along line D-D in (A). It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment. It is a figure which shows 4th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 Support base 3 Seat 4 Backrest 7 Back support member 13 Back frame 13a Side member 14 Back seat which comprises a body receiving part 15 Lumber support 16 Plate-like support body 16a which constitutes a body receiving part Foot part

Claims (3)

A chair having a structure in which a backrest or a seat or both support a body receiving portion with a frame opened on the front and back,
The body receiving portion includes at least a plate-like support body that is elastically deformed so as to sink in the action direction of the body pressure when the body pressure of a seated person is applied, and the peripheral portion of the plate-like support body is attached to the frame. Installing,
Chair. The body receiving portion includes a sheet-like support body having flexibility in addition to the plate-like support body, and the body pressure of a seated person is supported by the plate-like support body via the sheet-like support body. It has become so,
The chair according to claim 1. The frame is a back frame that constitutes a backrest, and a lumbar support that intensively presses the waist or back of a seated person is disposed on the front surface or the back surface of the plate-like support.
The chair according to claim 2.

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