JP4133650B2 - Chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a chair.
[0002]
[Prior art]
  There are various types of chairs. As an example, a swivel chair in which a seat plate is rotatably supported by a gas cylinder as a leg column is frequently used. Further, as one aspect of the swivel chair, there is a seat (round swivel chair) in which the seat is formed in a circular shape in plan view and the direction of the use posture is eliminated. In this case, the gas cylinder is installed regardless of the posture of the seat plate. Some lift levers are formed on a ring so that they can be operated.
[0003]
  As an example, in Patent Document 1 (Japanese Utility Model Publication No. 7-1003), a push valve of a gas cylinder protrudes from an upper end surface, while an operation ring is arranged near the lower surface of a seat plate, and a person is seated. A configuration is described in which the lever can be operated by hand in the state.
[0004]
  More specifically, in Patent Document 1, a plurality of upward opening window holes are formed in the receiving base so as to extend radially, and a ring is fixed to an outer end portion of a lever disposed in the window hole. The inner end of the ring is fixed to the disk, and the disk is interposed between the upper wall screwed to the receiving base and the push valve. When the ring is moved up and down, the disk tilts due to the lever action. This pushes down the push valve.
[0005]
  Round shape rotationThe seat portion of the chair is generally provided with a seat plate on which a cushion material is stretched and an outer shell disposed below the seat plate. The same applies to Patent Document 1, in which the outer shell and the seat plate are fixed to the receiving base with screws.
[0006]
[Patent Document 1]
No. 7-1003
[0007]
[Problems to be solved by the invention]
  To assemble the chair in the configuration of Patent Document 1, the upper wall is attached to the receiving base with screws in a state where the disk is arranged at a predetermined position, and then the outer shell and the seat plate are fixed to the receiving base with screws. As a result, the assembly of the upper wall must be fixed to the receiving base with screws and the outer shell and seat plate must be aligned and screwed one by one. is there.
[0008]
  In addition, as mentioned above,Round shape rotationIn the chair, the seat has a structure in which an outer shell is arranged below the seat plate (inner member), but the outer shell is made of synthetic resin and is a strength member. Most of the functions are not provided.
[0009]
  For this reason, the strength of the seat portion must be ensured exclusively by the seat plate, so that the seat plate must be made of a metal plate or a thick synthetic resin. However, there is a problem that the process of making the seat plate made of a metal plate is troublesome and difficult to develop various designs. On the other hand, if the seat plate is made of a thick synthetic resin, there is a problem that not only the cost increases, but also the design for securing the strength is troublesome and it is difficult to carry out various design developments.
[0010]
2 An object of the present invention is to improve such a current situation.
[0011]
[Means for Solving the Problems]
  The chair according to the present invention isThe seatMade of metal plateSupport on the receiving baseBeforeRegisterIs, Cushioning material on the top or notCircular in plan viewA seat plate,The seat plateA reinforcing plate made of a metal plate arranged below,Said reinforcing plateWith an outer shell made of synthetic resin placed belowAnd saidReinforcement plate for seat plate and outer shellToBy fastening with fasteners individually or by fastening them together with fasteners,AboveA seat plate, a reinforcing plate, and an outer shell are unitized.
[0012]
  in frontReceiving base is,UpIt has a bowl-like shape that opens in the direction and has a flange on the opening edge.This receiving baseFixed to the upper end of the gas cylinder as a pedestalSurelyAndAnd saidA push valve for releasing the lock of the gas cylinder protrudes from the upper end surface of the gas cylinder.
[0013]
  On the other hand, the outer shell isAboveA trumpet-shaped or tapered outer periphery extending upward from the flange of the receiving base;AboveContinuing integrally with the upper part of the outer peripheryAboveIt has an upper plate that overlaps the reinforcing plate,AboveA hollow part is formed inside the outer peripheral part, andOf the outer shellThe outer peripheral portion is divided by a plurality of downward opening grooves extending radially in plan view, and a lever for operating the push valve to be pushed down is disposed in the downward opening groove,AboveThe lever is formed so that a finger-running portion on which a seated person can put his / her finger extends in the circumferential direction.
[0014]
  Furthermore, in a plurality of portions of the reinforcing plate that do not interfere with the downward opening groove of the outer shell,AboveA plurality of feet that penetrate the outer shell and overlap the receiving base protrude downward, and these feet are fastened to the receiving base with screws.The
[0015]
  Claim2In the invention of claim1The portion of the lever that has entered the inside of the outer shell is the upper plate of the outer shell.InIt is held so as to be tiltable or horizontally slidable when hitting from below, and in the space between the outer shell and the receiving base, when the lever is tilted or horizontally slid, it moves downward to push down the push valve. The body is placed.
[0016]
[Operation and effect of the invention]
  In the present invention, since the strength of the seat portion can be ensured by the reinforcing plate, the seat plate can be made of synthetic resin, giving priority to sitting comfort and workability, and the seat plate is made of wood such as plywood. The outer shell can also be designed with an emphasis on aesthetics. For this reason, the freedom of design can be expanded, and the development of product variations can be enriched.
[0017]
  In addition, the seat plate, the reinforcing plate, and the outer shell can be pre-unitized (set) and received and attached to the base, so the seat plate, the reinforcing plate, and the outer shell constituting the seat are positioned one by one. However, it is not necessary to fix to the receiving base while the chair can be assembled efficiently and accurately.
[0018]
  Furthermore, it is applied to a round swivel chair.Since the lever is arranged in the downward opening groove formed in the outer shell, the receiving base can be held with high strength and processed.ButSimple (In Patent Document 1, since the receiving base has a complicated shape, the strength design is troublesome and the processing is also troublesome..). Since the outer shell is a molded product of synthetic resin, the workability is not lowered by forming the downward opening groove.
[0019]
  In addition, since the upper plate of the outer shell also serves as a support for the lever, when assembling the chair, place the lever or actuator on the receiving base, then stack the seat unit on the receiving base and screw it onto the receiving base. It is only necessary to fasten the legs of the reinforcing plate, and there is no need for a step of receiving the upper wall and screwing it to the base as in Patent Document 1.
[0020]
  The components of the mechanism that operates the push valve of the gas cylinder in this wayOne by oneCombined with the fact that the work of screwing is not necessary and the fact that the seat part is unitized and no positioning work is required, the assembly work of the chair can be performed efficiently.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
  Next, embodiments of the present invention will be described with reference to the drawings.
[0022]
  (1). First embodiment (FIGS. 1 to 14)
  1 to 14 show the first embodiment. First, an outline will be described with reference to FIGS.
[0023]
  (a) Overview
  As shown in FIG. 1, the chair includes a leg 1 and a circular seat portion 2 in plan view, and the leg 1 includes a gas cylinder 3 as a leg column and a grounding portion 4 that supports the gas cylinder 3. Yes. A caster 5 is attached to the grounding portion 4. The gas cylinder 3 is covered with a leg cover 6.
[0024]
  A receiving base 7 made of a metal plate is fixed to the upper end of the gas cylinder 3, and the seat 2 is supported by the receiving base 7. The seat 2 includes an outer shell (which may be called a cover) 8, and four unit levers 9 for releasing the lock of the gas cylinder 3 are arranged so as to surround the outer shell 8 (accurately). The finger hooks of the unit levers 9 extend so as to surround the outer shell 8..).
[0025]
  Since the group of unit levers 9 extends in an annular shape as a whole, a finger can be placed on any unit lever 9 regardless of the posture of the seat portion 2.
[0026]
  As shown in FIGS. 2 to 4, a backrest 11 is attached to the chair via a back support frame 10. 2 is a front view, FIG. 3 is a plan view, and FIG. 4 is a right side view. In the present embodiment, the back support frame 10 is composed of a base part 12 in a semicircular shape in plan view that surrounds about a half circumference of the outer shell 8, and a rising part 13 that extends obliquely obliquely rearward from the front end of the base part, The backrest 11 is provided integrally with the rising portion 13. A cushion 11 a is provided on the backrest 11.
[0027]
  The backrest 11 may be configured separately from the back support frame 10. Moreover, it is also possible to make a backrest of a wide area by fixing a back plate to the backrest 11 of this embodiment by screwing or the like. The backrest 11 can be attached to the back support frame 10 so as to tilt backward against elasticity.
[0028]
  As described above, the four unit levers 9 are arranged in the circumferential direction, but each unit lever 9 is detachable, and the two adjacent unit levers 9 are removed and the two removed unit levers 9 are removed. A back support frame 10 can be attached instead of the lever 9 (details will be described later).
[0029]
  (b) Outline of internal structure
  Next, details of the structure will be described with reference to FIG. FIG. 5 is a separated sectional view, FIG. 6 is a sectional view in an assembled state, and FIG. 7 is a partial sectional view.
[0030]
  As shown in these drawings, a reinforcing plate 13 made of a metal plate is arranged inside the outer shell 8, and a synthetic resin seat plate 14 is fixed to the upper surface of the reinforcing plate 13 with screws 15. The outer shell 8 is fixed to the lower surface of the reinforcing plate 13 with screws 16. A cushion material 17 is stretched on the seat plate 14. An inner end portion of each unit lever 9 is fixed to a first operating body 18 made of a metal plate.
[0031]
  The receiving base 7 is formed in a bowl shape having a circular shape in plan view and opened upward, and a flange 7a is provided at the upper end. An auxiliary plate 19 is fixed inside the receiving base 7, and the upper portion of the gas cylinder holder 20 is fixed to the auxiliary plate 19. A guide cylinder 21 surrounding the gas cylinder 3 is fixed to the auxiliary plate 17.
[0032]
  A push valve 22 protrudes from the upper end surface of the gas cylinder 3, and a second operating body 23 for pushing down the push valve 22 is fitted into the guide cylinder 21 so as to be movable up and down. By pushing down the second working body 23 with the first working body 18, the push valve 22 is pushed down and the lock of the gas cylinder 3 is released.
[0033]
  (c) Details of internal structure
  Further details will be described with reference to FIG. 8 is a separated perspective view of the reinforcing plate 13 and the seat plate 14 as viewed from below, FIG. 9 is a separated perspective view of the outer shell 8 and the reinforcing plate 13 as viewed from below, and FIG. 10 is a view of the outer shell 8 from above. 11A is a plan view of the reinforcing plate 13, FIG. 11B is a bottom view of the outer shell 8, and FIG. 12 is an exploded perspective view of the group of unit levers 9 and the first operating body 18. 12A is a separated sectional view showing the operating mechanism, FIG. 12B is a plan view taken along the line BB in FIG. 12A, FIG. 14C is a plan view taken along the line CC in FIG. It is a figure which shows the attachment method of the material. 6 and 7 are cross-sectional views seen from the XX direction of FIG.
[0034]
  The outer shell 8 includes a trumpet-shaped outer peripheral portion 8a extending upward from the flange 7a of the receiving base 7 and a top plate 8b having a cross shape in plan view provided integrally with the upper end of the outer peripheral portion 8a. An inner cylinder portion 8c continuous with the upper plate 8b is formed at the inner end of the outer peripheral portion 8a. A downward opening groove 8d with the upper plate 8b as a bottom is formed in the outer peripheral portion 8a so as to open inward and outward, and a lever 9 is fitted in the downward opening groove 8d so as to be movable.
[0035]
  An inward support portion 8e that is overlapped with the flange 7a of the receiving base 7 from above is integrally provided on both sides of the inner cylindrical portion 8c of the outer shell 8 with the downward opening groove 8d interposed therebetween. For this reason, the outer shell 8 can maintain remarkably high stability.
[0036]
  A double cylindrical upper support portion 8f against which the first operating body 18 hits is provided in a portion inside the outer cylindrical portion 8c of the outer shell 8, and the upper support portion 8f is directed downward from the upper plate 8b. It protrudes. The outer shell 8 is fastened to the reinforcing plate 13 with screws 16 at the location of the upper plate 8b.
[0037]
  In addition, two mounting holes 24 for fastening the back support frame 10 are formed in a distributed state in a portion closer to the outside of the bottom portion (that is, the upper plate) of each downward opening groove 8d. The reinforcing plate 13 has screw holes 25 corresponding to the two mounting holes 24.
[0038]
  An upward outer peripheral rib 8g is formed on the outer peripheral edge of the outer shell 8, and is formed in a disc shape so as to be fitted to the reinforcing plate 13 and the outer peripheral rib 8g from the inside. The reinforcing plate 13 is formed by cutting up and forming L-shaped foot portions 13a that overlap the flange 7a of the receiving base 7 at four portions that do not overlap with the downward opening groove 8d of the outer shell 8. 13a is fastened to the base 7 with screws 26.
[0039]
  The foot portion 13a is positioned between the adjacent inward support portions 8d in the outer shell 8 and is set to fit inside the inner cylindrical portion 8c of the outer shell 8.TheIt is. For this reason, it is positioned accurately. As shown by the alternate long and short dash line in FIGS. 11 and 6, reinforcing ribs 13 b are bulged and formed on the reinforcing plate 13 in order to increase its rigidity (bending strength).
[0040]
  For example, as shown in FIG. 6, a stepped bending portion 13 c is formed on the outer peripheral edge of the reinforcing plate 13.13cIs fitted into the outer peripheral rib 8g of the outer shell 8 from the inside. Needless to say, the rigidity of the reinforcing plate 13 is significantly improved by the presence of the bent portion 8c.
[0041]
  In this embodimentOf the reinforcing plate 13Reinforcement rib13b is a plan view as shown in FIG.Formed in a substantially trapezoidal shape, but extending radiallyInFor example, various forms can be adopted. Further, as means for improving the strength of the reinforcing plate 13, an embossing process may be applied to the entirety instead of or in addition to the reinforcing rib 13b.
[0042]
  For example5FromAs you can see,The outer peripheral edge of the seat plate 14 is a curled portion 14a curved downward. For example, as can be understood from FIG. 8, cylindrical and radial ribs 27 are formed on the lower surface of the seat plate 14, and the reinforcing plate is formed by screws 15 screwed into a cylindrical portion 28 provided at the ribs 27. 13 is concluded. The seat plate 14In the reinforcing plate 13It is screwed to the seat plate 14 at a portion outside the foot portion 13a.
[0043]
  As understood from FIG. 5 and FIG. 7, a reinforcing projection 13 d bulges out at the center of the reinforcing plate 13. In addition, a slight gap is provided between the rib 27 located at the center of the seat plate 14 and the reinforcing plate 13. This is to prevent the pressing force from being transmitted to the first operating body 18 via the reinforcing plate 13 and the outer shell 8 even if a person is seated and the seat plate 14 is bent and deformed.
[0044]
  For example, as shown in FIG. 12, the first operating body 29 is formed in a substantially quadrangular shape in plan view. On the other hand, each unit lever 9 is made of a synthetic resin (may be made of a metal plate) and is formed in a substantially plate shape. As can be understood from FIGS. 6 and 7, the outer peripheral portion is low and the inner peripheral portion is high.InInclined. Each unit lever 9 can be pulled upward or horizontally by placing a finger on its inner peripheral surface.
[0045]
  As can be understood from FIG. 6A, each unit lever 9 is integrally formed with a pair of inwardly-facing portions 9a that fit into the downwardly-opening grooves 8d of the outer shell 8, and the tip portions of both inwardly-facing portions 9a are integrally formed. To the inward end 9b.
[0046]
  The inward tip portions 9b of the unit levers 9 form a right angle in plan view, and therefore the group of inward tip portions 9b has a single plate state as a whole. Each inward leading end 9 b is fixed to the first operating body 29 with a screw 30. Therefore, each unit lever 9 can be freely attached to and detached from the first operating body 18.
[0047]
  As for the inward part 9a of the adjacent unit lever 9, the side part overlaps about the half part located inside the radius, and the space | interval spreads as the outer part goes to a radius outer side. For this reason, a group of four unit levers 9 forms a petal-like shape. The downward opening groove 8d of the outer shell 8 is set to a width dimension in which the inward portion 9a of the unit lever 9 can move by a certain amount in the width direction.
[0048]
  While the center hole 33 is vacant in the first actuating body 29, the inwardly facing tip end portions 9 b of the unit levers 9 are overlapped with the actuating cylinders 31 that are opened downward. The center protrusion 32 is forcibly fitted into the center hole 33 of the first operating body 18. Further, as an example of the positioning means, the operation cylinder 31 is provided with a fitting pin 34 protruding upward corresponding to the inward tip portion 9b of each unit lever 9, and the fitting pin 34 is connected to each unit lever 9. Is forcibly fitted into an engagement hole 35 formed in the inward end portion 9b.
[0049]
  As described above, the operating cylinder 31 is forcibly fitted to the first operating body 18 and the inward end portion 9b of each unit lever 9, so that the operating cylinder 31 is held so as not to fall off without being screwed. In addition, even when only two (or only one) unit levers 9 are attached to the first operating body 18, the unit levers 9 are held so as not to rattle.
[0050]
  At the center of the second operating body 23 is formed an upwardly narrowed chevron portion 23a, and the actuating cylinder 31 abuts the upper surface of the second actuating body 23 so as to surround the bottom of the chevron portion 23a. ing.
[0051]
  (d) Elevating mechanism for seat
  As shown by a one-dot chain line in FIG. 7, when an arbitrary unit lever 9 is put on a finger and pulled upward or pushed downward, the entire group of unit levers 9 and the first operating body 18 support the upper shell 8. When tilting with the portion 8f as a fulcrum, the second operating body 23 is pushed down by a lever action, and the push valve 22 is pushed down.
[0052]
  In addition, as shown by a one-dot chain line in FIG. 7, when a finger is placed on any unit lever 9 and pulled or pushed in the horizontal direction, the group of unit levers 9 and the first operating body 18 move horizontally, The two actuating bodies 23 are moved downward by the actuating cylinder 31 because the mountain-shaped portion 23a is tapered, and the push valve 22 is pushed down to unlock the gas cylinder 3.
[0053]
  In this way, it is convenient because the lock of the gas cylinder 3 can be released by pushing the push valve 22 no matter how the unit lever 9 is put on a finger and moved in any way. When a person operates the unit lever 9, a horizontal pulling force and a vertical pulling force are often combined, such as pulling the unit lever 9 obliquely upward, but in this embodiment, In such a case, the second operating body 23 can surely descend to push down the push valve 16.
[0054]
  (e) Backrest installation specifications
  When the backrest 11 is attached, two unit levers 9 are fixed to the first operating body 18 as shown by a one-dot chain line in FIG.
[0055]
  On the other hand, the back support frame 10 includes inward branch portions 10a that fit into the three downward opening grooves 8d of the outer shell 8, and the inward branch portions 10a are fastened together with the outer shell 8 to the reinforcing plate 13 with screws 15. Has been. In this case, the inward branch portion 10a at the center of the back support frame 10 has a width dimension that fits tightly into the downward opening groove 8d of the outer shell 8, but the inward branch portions 10a located on both sides of the lever 9 Narrow so as not to disturb horizontal movement.
[0056]
  Since the inward branch portion 10a positioned on the side is arranged in a state of being misaligned with the downward opening groove 8d of the outer shell 8, the two downward mounting grooves 24d are formed in the downward opening groove 8d of the outer shell 8. It is formed in a distributed state.
[0057]
  It is preferable that a burring portion into which the screw 15 is screwed is formed in the reinforcing plate 13 in advance. Also with screwsShiTapping screw or drillRightIt is also possible to use self-piercing screws such as screws.
[0058]
  (f) Installation of cushion material
  Next, a method for attaching the cushion material 17 will be described with reference to FIG. A cloth (skin material) 36 such as cloth or leather is overlaid on the surface of the cushion material 17. The outer peripheral edge of the cloth 36 is formed in a cylindrical portion by sewing or the like, and a wire rod (or a string) 37 such as a wire is fitted into the cylindrical portion and held in a loop shape (note that The cross-sectional display of the wire rod 37 is omitted..).
[0059]
  As shown by the alternate long and short dash line in FIG. 14 (B), the cushion material 17 is formed in a disk shape with an equal thickness. After the cloth 36 is overlapped on the surface, the wire material 37 is drawn and narrowed down (B ), The edge of the cushion member 17 is compressed while being wound downward along the curled portion 14a of the seat plate 14, and in this state, the wire member 37 is twisted at both ends and held in a loop shape.
[0060]
  Then, the outer shell 8 is fastened to the reinforcing plate 13 so that the outer rib 8g of the outer shell 8UpWhile pushing up in the direction, the wire rod 37 is hidden between the reinforcing plate 13 and the outer shell 8.
[0061]
  The cross 36 was originally circularsoYes, wrinkles are generated by narrowing with the wire rod 37, but the wrinkles are not exposed to the outside by being pushed upward by the outer peripheral rib 8g of the outer shell 8, and the appearance is good. Note that the edge of the cross 36 may be pushed upward by the bent portion 13c of the reinforcing plate 13 as shown by a dashed line in (A), or the outer peripheral rib of the outer shell 8 as shown in (C). 8 g may be formed so as to surround the reinforcing plate 13, and the cross 36 may be pushed upward by the outer peripheral rib 8 g of the outer shell 8.
[0062]
  By the way, in the conventional round chair, there are many configurations in which the cushion material is only placed on the upper surface of the seat plate regardless of whether it is a rotary type. Sometimes it hits the edge and gives a sense of incongruity (push-up feeling).
[0063]
  AndFor example, when a nurse is in contact with a patient in a hospital, sit on the chair instead of sitting deeply on the chair and sit on the body and hit the thigh against the edge of the seat. In this case, HardEdge of seat plateTake weightFor this reason, the thigh push-up phenomenon by the seat plate was particularly strong.
[0064]
  On the other hand, the structure in which the edge portion of the seat plate 14 is wound with the cushion material 17 as in the present embodiment has an advantage that the cushioning property can be secured even in the case of the hooking and the thigh push-up phenomenon can be prevented. Such a method of tensioning the cushion material 17 can be widely applied to a general seat or back of a chair.
[0065]
  The cushion material 17 may be adhered to the upper surface of the seat plate 14 or may simply be stacked. In the present embodiment, the cushion material 17 can be attached so as not to be displaced simply by being overlaid on the seat plate 14, so that it does not take time to process the cushion material 17 and the seat plate 14 after disposal, and is excellent in environmental compatibility. ing.
[0066]
  (g) Summary
  As can be understood from the above description, since the seat plate 14 and the outer shell 8 are fixed to the reinforcing plate 13 in the present invention, the form of the seat plate 14 and the outer shell 8 can be freely designed.
[0067]
  In addition, when applied to a mechanism having a lever operating mechanism having a first actuating body that is stretched from above as in the present embodiment, the first actuating body 18 is an upper support portion of the outer shell 8.8fTherefore, even if the seat plate 14 is deformed by the weight of the person who is seated, the influence of the deformation does not reach the first actuating body 18, thereby preventing malfunction. .
[0068]
  Further, since the first operating body 18 is in contact with the upper support portion 8f formed on the outer shell 8 made of synthetic resin, the rubbing sound that occurs when the metals come into contact with each other when the lever 9 is operated is not generated. Therefore, there is an advantage that it does not cause discomfort to the person.
[0069]
  Further, since the seat plate 14, the reinforcing plate 13, and the outer shell 8 are a unit (set), when assembling the chair, the second operating body 23 is fitted into the guide tube 21, and then the lever 9 is A simple operation of fitting the seat unit in the downward opening groove 8d of the shell 8 on the flange 7a of the base 7 and then fixing the reinforcing plate 13 to the base 7 with screws 26 is sufficient. Therefore, the efficiency of assembly work can be improved.
[0070]
  In addition, since the foot part 13a of the reinforcing plate 13 can be formed with high accuracy by sheet metal processing, the height of the second operating body 23 can be accurately aligned even in a structure in which the reinforcing plate 13 is simply fastened to the base 7 with screws. be able to.
[0071]
  (2). No.2 fruitsEmbodiment (Fig. 15)
  FIG. 15 shows a second embodiment. In this embodiment, the seat plate 14 is formed of a wooden plate such as plywood. As shown in (B), the backrest 11 can be integrally provided on the seat plate 14.
[0072]
[0073]
[0074]
  When designing and manufacturing a conventional chair starting with Patent Document 1, each component is designed after the overall design is determined. That is, the chair is composed of a dedicated member for each type. However, it has not been very common to share the members in each type of chair (although it may be partially used).
[0075]
  On the other hand, when a reinforcing plate made of a metal plate is provided as a strength member of the seat as in this embodiment,2 fruitsSince the material and planar shape of the seat portion 2 can be freely set as in the embodiment, there is an advantage that members can be shared by chairs having different external designs. In other words, one type of support mechanism and various seats and backrestsofAn upper member can be attached. For this reason, when it sees as the whole group of chairs, the cost control effect is high.
[Brief description of the drawings]
FIG. 1 is a front view of a chair in a mode in which a backrest is not attached in the first embodiment.
FIG. 2 is a front view of a mode in which a backrest is attached in the first embodiment.
FIG. 3 is a plan view of a mode in which a backrest is attached in the first embodiment.
FIG. 4 is a right side view of a mode in which a backrest is attached in the first embodiment.
FIG. 5 is a longitudinal sectional view showing a separated state.
FIG. 6 is a cross-sectional view in an assembled state.
FIG. 7 is a partial longitudinal sectional view.
FIG. 8 is a separated perspective view of a reinforcing plate and a seat plate as viewed from below.
FIG. 9 is an exploded perspective view of the outer shell and the reinforcing plate as viewed from below.
FIG. 10 is a perspective view of an outer shell as viewed from above.
11A is a plan view of a reinforcing plate, and FIG. 11B is a bottom view of an outer shell.
FIG. 12 is an exploded perspective view of a group of unit levers and a first operating body.
13A is a separated sectional view showing an operation mechanism, FIG. 13B is a plan view taken along the line BB in FIG. 13A, and FIG. 13C is a plan view taken along the line CC in FIG.
FIG. 14 is a view showing a method of attaching a cushion.
FIG. 15 is a diagram showing a second embodiment.
[Explanation of symbols]
    1 leg
    2 seats
    3 Gas cylinder as a leg support
    7 receiving base
    8 Outer shell
    8a Outer periphery
    8b Upper plate
    8d downward opening groove
    9 Unit lever
    9a Inward facing part
    9b Inward end
  10 Back support frame
  11 Backrest
  13 Reinforcing plate
  13a Foot
  14 Seat plate
  18 First Actuator
  22 Push valve
  23 Second Actuator

Claims (2)

The seat is supported by a metal plate receiving base ,
Said seat is arranged a metal plate made of a reinforcing plate in a plan view a circular seat plate which are not or stretched cushion material is stretched, and disposed below the seat plate on the upper surface, below the reinforcement plate It was a construction that includes a synthetic resin of the outer shell, by co-fastening the seat plate and or tripartite fastened individually at full Asuna the outer shell, each reinforcing plate with fasteners, and the seat plate While the reinforcing plate and outer shell are unitized ,
The receiving base has a bowl-like shape that opens upward, has a flange portion at the opening edge, and fixes the receiving base to the upper end of the gas cylinder as a pedestal, and from the upper end surface of the gas cylinder A push valve for unlocking the gas cylinder protrudes,
A chair called
The outer shell includes a trumpet-shaped or tapered outer periphery that extends upward from the flange of the receiving base, and an upper plate that is integrally continuous with the upper portion of the outer peripheral portion and overlaps the reinforcing plate. A hollow portion is formed inside the outer peripheral portion, and the outer peripheral portion of the outer shell is divided by a plurality of downward opening grooves extending radially in a plan view, and the push hole is inserted into the downward opening groove. A lever for pushing down the valve is arranged, and the lever is formed such that a finger driving part on which a seated person can hang a finger extends in the circumferential direction in plan view,
Furthermore, a plurality of feet that penetrate the outer shell and overlap the receiving base protrude downward from a plurality of portions of the reinforcing plate that do not interfere with the downward opening groove of the outer shell. Fastened to the receiving base with screws;
Chair. A portion of the lever that has entered the outer shell is held so as to be tiltable or horizontally slidable by hitting the upper plate of the outer shell from below, and in the space between the outer shell and the receiving base, , An actuating body is disposed that moves downward when the lever is tilted or horizontally slid to push down the push valve;
The chair according to claim 1.

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