JP4884666B2 - Chair - Google Patents

Description

  The present invention relates to a chair characterized by a backrest.

  Some chairs have a structure in which a backrest or a seat or both have a net seat body stretched around a frame. This chair is generally referred to as a net chair, and has an advantage of excellent breathability and cushioning properties.

In addition, in a chair having a backrest having a net structure, a lumbar support is provided to partially push the waist and back of a seated person. As an example, Patent Document 1 describes that a lumbar support is attached to a back frame so as to be movable up and down, and an operation portion is provided on the lumbar support.
JP 2004-49657 A

  In Patent Document 1, the operation part of the lumbar support is completely hidden behind the back seat. Therefore, when a seated person adjusts the height of the lumbar support, both hands must be turned to the back side of the backrest. Therefore, there was a problem that it was difficult to adjust the height of the lumbar support.

  Also, it is possible to form a back sheet in a bag shape and put it on the back frame, and this configuration has the advantage that the back sheet can be easily attached, but in this case the lumbar support is the back sheet In other words, the configuration of Patent Document 1 cannot be applied because it is disposed in the space between the front surface portion and the back surface portion.

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

The back of the chair according to the present invention is basically composed of a back frame having upper and lower left and right side members and an upper member connected between upper ends thereof, and a flexible back seat stretched on the back frame. In addition, a lumbar support is disposed on the back side of the portion of the back sheet that the human body hits so that the height of the lumbar support can be adjusted.

The back seat is formed in a bag shape having a front portion against which a seated person's back hits and a back portion located on the back side, and covers the back frame from above , and left and right lower corner portions. And the left and right lower ends of the back frame are exposed by forming a notch in the lower corner portion of the backsheet, while the lumbar support is formed between the front and back portions of the backsheet. It is disposed in the space between, the lumbar support, along with being mounted for height adjustment on a support fixed to the side member, the bottom of the lumbar support, operation of the lift to the lumbar support and integral Is formed on the front side of the lower end portion of the back frame in a front view, and the operation portion is cut off the back sheet. It is exposed from the gas.

According to the present invention, since the operation portion of the lumbar support extends to the left and right lower end of the back frame, a human when adjusting the lumbar support height can shed hands in a natural state to the operation of the lumbar support Therefore, the lumbar support height can be adjusted easily. The present invention can also be applied when the back sheet is formed in a bag shape.

In addition, providing the lumbar support operation part at the lower part is more preferable because a person can have the lumbar support operation part without bending the arm. Further, since the operation portion of the lumbar support is located in front of the back frame, advantage is supported by the well back frame by external force acts backward on the operation unit of the lumbar support can be prevented from being broken or deformed There is also.

  Next, an embodiment of the present invention will be described with reference to the drawings.

(1). Outline of First Embodiment FIGS. 1 to 9 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 (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 receiving member 7 and the supporting base 2 are connected by a gas cylinder 10, a lever 11 disposed on the outer surface side of the back receiving member 7 by rotation operation, switch the gas Sushirinda 10 between the locked state and the free state by operating the backrest 4 can be switched between a locked state held tilted backward incapable free state and any orientation that the rear tilt the self standing. 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, the left and right rear portions of the back support member 7 are formed with recesses (or stepped portions) 24 that open rearward and downward, and the lever 11 is disposed in the recess 24. Yes. According to this structure, it is possible to prevent the lever 11 from protruding outside of the back frame 13, prevents the appearance is, for example human clothing with good with Turkey scratched the lever 11, further operation of the lumbar support 15 There is an advantage that interference with 15a can be avoided.

Backrest 4 comprises a back frame 13 consisting of an upper member 13b that is connected to the side members 13a and the upper end, and a bag-shaped back backsheet 14 overlaying this 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 a space opened in the front-rear direction (for example, the middle where the left and right side members 13 a are connected at a height position in the vertical direction) may be provided with a member.).

The backsheet 14 is provided with a rear surface portion 14b located before surface 14a and its rear side to the back of the seated person hits, between the two vacant space. Then, the space between the front surface portion 14a and the bottom 14b, and lumbar support 15 which mainly supports the seated person lumbar spine is disposed vertically movably.

Although the details will be described later, the lumbar support 15 is attached to a thin plate-like support 16 disposed on the back side thereof so as to be movable up and down. The support body 16 is formed with a bifurcated left and right end portion, and its tip is fixed to the side member 13a of the back frame 13 by means such as screws. The support body 16 is made of a synthetic resin plate and has a flexible structure that can be bent and deformed in the front-rear direction. Therefore, the support body 16 also bears the cushioning property of the backrest 4.

  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, details of the backrest will be described with reference to FIG. 4 is a front view with the back sheet omitted, FIG. 5 is a separated front view, FIG. 6 is a perspective view of the back support member 7, and FIG. FIG. 8 (B) is a view showing a procedure for attaching the back sheet 14, FIG. 8 (A) is a cross-sectional view taken along the line VIIIA-VIIIA in FIG. 2, (B) is a cross-sectional view taken along the line VIIIB-VIIIB in FIG. (A) is an exploded perspective view of the lumbar support 15 and its support 16, (B) is a perspective view of the lumbar support 15 attached to the support 16, and (C) is a CC of (B). FIG.

As can be easily understood from FIG. 6, the back support member 7 includes left and right forward arms 7 a, and a bridge bracket 22 is fixed to the upper surface of the arms 7 a by 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 on the upper surface of the flat portion 7c, a left and right bank portion 7d protrudes upward. 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 end portions 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 backsheet 14 is manufactured with fabric or knitted fabric as a material having moderate voids, left and right sides of the front surface portion 14a and the bottom 14b is connected together by sewing or fusion. Then, Shimesuru so in FIGS. 6 and 7, the lower edge of the lower edge and the bottom 14b of the front surface portion 14a, the edge member in a plan view bow made of a resin plate or a metal plate, respectively (crescent loose curvature) 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. In addition, although the notch opening part 30 opened backward is formed in the left-right intermediate part of the edge members 20 and 21, this is a press plate (not shown) which operates the push valve (not shown) of the gas cylinder 10. To avoid interference).

As shown in FIG. 7 (A), in the present embodiment, the downward projecting bolt (screw shaft) 31 of the plurality of (four) in the edge member 20 fixed to the front face 14a of the backsheet 14 at the right and left appropriate intervals to one, the edge member 2 1 fixed to the lower end of the back face portion 14 b forms a throughbore 32 which bolt 31 passes, receiving back the bolt 31 in a laminated state two edge members 20 and 21 members 7 The two edge members 20 and 21 are fastened together with the back support member 7 by passing through the attachment hole 33 provided in the upper part and screwing the nut 34 into the bolt 31. Of course, the back sheet 14 may be fixed to the back support member 7 by other methods.

When attaching the back sheet 14, first, as shown in FIG. 7 (B), both edge members 20, 21 are put on the back frame 13 in a separated state, and then both edge members 20, 21 at an appropriate height position. Overlaying the, then, the edge member 20, 21 inserted through the hole 33 mounting the bolts 31 is lowered shear, then good Once screwing nut 34 on the bolt 31.

The lumbar support 15 is made of a synthetic resin. As can be understood from FIGS. 8 and 9, for example, the body 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. In addition, an operation arm 15b extending left and right is integrally formed at the lower portion of the body support portion, and the tip of the operation arm 15b is exposed from the notch 17 of the back seat 14 as the operation portion 15a.

Further, as a means for supporting the lumbar support 15 so as to be movable up and down, a vertical guide groove 36 and a forward projection 37 positioned therebelow are formed on the support 16, while the guide groove 36 is formed on the back surface of the lumbar support 15. to the head 38a with the pin 38 to be fitted, and left right pair of guide rails 39 you left shift incapable scissors hold the forward protrusion 37 of the support 16 is formed.

  There are two pin portions 38 on the upper and lower sides and the thickness of the pin portions 38 fits in the guide groove 36, and the head 38 a has an outer diameter larger than the groove width of the guide groove 36. In order to allow the insertion of the head 38a, the support 16 is provided with a circular hole 40 communicating with the lower end of the guide groove 36.

  In addition, on the left and right sides of the lumbar support 15 sandwiching the pin portion 38, a side-viewing back-shaped chevron 41 is formed. The left and right sides of the elastic 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 in the back frame 13, and the protruding portion is formed in a rearward convex hook shape. 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.

(4). Second embodiment and modifications (FIGS. 10 to 12)
FIG. 10 shows the second embodiment, and is a front view of the entire backrest 4. Also in this embodiment, the back sheet 14 is formed in a bag shape, and an intermediate plate 45 and a lumbar support 15 that are elastically deformed, such as a synthetic resin, are disposed in a hollow portion of the back sheet 14. The intermediate plate 45 is formed with a large number of slits 46 so as to be easily bent and deformed, and the left and right end portions and the lower portion thereof are fixed to the side member 13 a of the back frame 13 via brackets 47. The left and right side portions of the intermediate plate 45 have a rigid structure that hardly bends and deforms.

  Unlike the first embodiment, the lumbar support 15 has a rigid structure that hardly bends and deforms, and is disposed on the back side of the intermediate plate 45. As a means for arranging the lumbar support 15 so as to be movable up and down, a guide means similar to that of the first embodiment, a vertically long rail, and the like are provided on the lumbar support 15 and the intermediate plate 45 at a portion between the left and right slits 46. For example, a guide means 48 may be provided.

  11 and 12 show a modification of the vertical movement guide means of the lumbar support 15. 11 is a partial front view of the backrest 4, and FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. In this modification, a pair of left and right guide rails 49 extending in the vertical direction are formed on the left and right sides of the intermediate plate 45 and on the lower back surface, while the operation arm 15b of the lumbar support 15 is provided between the guide rails 49. The ridge 50 which fits in is formed. In any case, like the combination of the elastic claw 41 and the concavo-convex portion 42 in the first embodiment, engaging means (height holding means) for holding the height of the lumbar support 15 stepwise or steplessly. Is preferably provided.

(5). Other embodiments (FIGS. 13 to 14)
FIG. 13 shows a third embodiment which is another example of the vertical movement guide means of the lumbar support 15. In the third embodiment, a vertically long guide member 51 is screwed on the side member 13 a of the back frame 13. The guide member 51 is fixed by a stopper or the like, and the guide member 51 is formed with a vertically long guide groove 52, while the operation arm 15 b of the lumbar support 15 is provided with a ridge 50 slidably fitted in the guide groove 51.

(6). Others The present invention can be embodied in various ways other than the above embodiment. The material of the back sheet is not necessarily limited to the net, and a cloth or a resin sheet can be used if conditions such as strength allow .

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. It is a front view in the state where a back sheet was omitted. It is a separation front view. It is a perspective view of a back support member. (A) is a sectional side view of a state in which the back sheet is attached, and (B) is a view showing a procedure for attaching the back sheet. (A) is a sectional view taken along line VIIIA-VIIIA in FIG. 2, and (B) is a sectional view taken along line VIIIB-VIIIB in FIG. (A) is a separated perspective view of a lumbar support and its support body, (B) is a perspective view of a state in which the lumbar support is attached to the support body, and (C) is a sectional view taken along the line CC of (B). It is a front view of 2nd Embodiment. It is a front view of the modification of 2nd Embodiment. FIG. 12 is a sectional view taken along line XII-XII in FIG. 11. It is a figure which shows 3rd Embodiment.

2 support base 3 the seat support 4 backrest 7 back receiving member 13 back frame 13a side members 13b Upper member 14 back sheet 14a before surface 14b back surface 15 lumbar support 15a operating unit
15b Arm portion 16 Lumber support support

Claims (1)

The backrest has a basic configuration comprising a back frame having a vertically long left and right side member and an upper member connected between upper and lower ends thereof, and a flexible back sheet stretched on the back frame. The lumbar support is arranged on the back side of the part where the body hits.
The back seat is formed in a bag shape having a front portion against which a seated person's back hits and a back portion located on the back side, covers the back frame from above, and has left and right lower corner portions. While exposing the left and right lower ends of the back frame by forming a notch in the lower corner portion of the back sheet,
The lumbar support is disposed in a space between a front surface portion and a back surface portion of the back seat, and the lumbar support is attached to a support fixed to the side member so as to be adjustable in height, and An operation portion that moves up and down integrally with the lumbar support is formed at a lower portion of the lumbar support so as to be positioned on the front side of the lower end portion of the back frame when viewed from the front, and the operation portion is notched on the backsheet. Exposed from the
Chair.

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