JP3757332B2 - Chair gas spring operating device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas spring operating device that tilts a backrest of a chair backward.
[0002]
[Prior art]
A reclining chair using a gas spring is known as means for tilting the back of the chair backward.
In this chair, the gas spring is pivoted between the support provided at the upper end of the pedestal and the lower end of the back frame, and the valve operating part provided on the back frame is pushed to move the gas. The spring is extended and retracted to tilt the backrest backward.
[0003]
In a conventional operating device that pushes the valve operating portion of the gas spring, a pressing piece that presses the valve operating portion and an operating lever are linked by a wire, and the lever is rotated by the wire to push the valve operating portion. Most of them are designed to move.
[0004]
[Problems to be solved by the invention]
In a conventional operating device having a wire as described above, it is troublesome to adjust the length of the wire in order to allow the operating lever to have appropriate play. May increase, and the pressing operation of the valve operating portion may become slow.
[0005]
In addition, the holding mechanism for holding the valve operating unit in a pressed state becomes complicated, and the number of parts and the number of assembling steps increase, resulting in high costs.
[0006]
The present invention has been made in view of the above problems, and by using an operation means instead of a wire, troublesome adjustment work is unnecessary, reliable operability is obtained over a long period of time, and simple holding is achieved. It is an object of the present invention to provide a gas spring operating device for a chair that can hold the valve operating portion in a pressed state by means.
[0007]
[Means for Solving the Problems]
According to the present invention, the above problem is solved as follows.
(1) The lower part of the front end of the back frame having a backrest is pivotally attached to the support base at the upper part of the leg, and a gas spring is provided between the support base and the back frame, and the gas spring protrudes from the back frame side. In the gas spring operating device for a chair, in which the backrest is tilted backward by actuating the gas spring by pushing the valve operating portion, a substantially crank-shaped bent portion is provided at an appropriate position on the back frame. In addition, an operation lever that can be operated to rotate in the vertical direction is provided at one end, and an operation rod that faces the left and right direction, to which a pressing piece that can press the valve operation unit is fixed, is provided at the intermediate portion. And a holding member having a holding portion in which a locking shaft portion parallel to the operation rod in the bent portion is detachably fitted when the valve operation portion is pushed. Place to provide.
[0008]
(2) In the above item (1), the holding portion of the holding member is substantially U-shaped in a side view in which the size of the opening at the lower end is slightly smaller than the outer diameter of the locking shaft portion, and the upward direction of the locking shaft portion At the time of rotation, the locking shaft portion can be held in the holding portion by elastically deforming and expanding the opening portion.
[0009]
(3) In the above item (1) or (2), the lower end of the bent portion abuts the upper surface of the base piece facing the lower surface of the bent portion of the operation rod in the holding member when the operation lever is not operated. A stopper piece for preventing the locking shaft portion from rotating excessively downward is provided.
[0010]
(4) In any one of the above items (1) to (3), a crank-like bent portion is provided at a side end portion of the operating rod.
[0011]
(5) In any one of the above items (1) to (4), biasing means for biasing the crank-shaped bent portion upward is provided.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view of a reclining chair to which the present invention is applied, and mainly includes a leg (1), a seat (2), a back frame (3), and a backrest (4).
[0013]
The leg body (1) has five radial legs (5), a leg pillar (6) erected at the center thereof, and a longitudinally attached to the upper end of the leg pillar (6). It consists of a long support (7).
[0014]
The seat body (2) is composed of a rectangular frame (8) and a cushion (9) mounted on the upper surface thereof, and a reed (10) (10) having a circular cross section before and after the frame (8). ) Are respectively pivotally supported by a recessed hole (11) at the front end of the support base (7) and bearing fittings (16) and (16) described later in the back frame (3).
[0015]
As shown in FIGS. 2 and 3, the back frame (3) has a plate-like recumbent portion with an upper end portion and a rear end portion of a pair of left and right side rods (12) and (12) having a forward L-shape. (13) and (14), and the front end is connected to each other by a pipe-shaped support rod (15) facing in the left-right direction, and is formed on the upper surface of the upward bulging portion of the front end of both side rods (12). Is attached with a downward U-shaped bearing fitting (16).
[0016]
As shown in FIG. 1, the left and right ends of the support rod (15) are pivotally supported by a U-shaped concave hole (17) formed slightly forward of the leg rod (6) in the support base (7). Yes.
[0017]
A pair of left and right support plates (18), (18) are connected to the lower end of the horizontal bar (14) connecting the rear ends of the side bar (12). On the corresponding left and right side rods (12), a downward U-shaped mounting bracket (20) having a rearwardly inclined mounting plate (19) at the inner end, and the mounting plate (19) of the support plate (18) It is fitted and fixed from above so as to contact the upper surface of the front end portion.
[0018]
The backrest (4) has a rear surface on the middle of the up and down direction pivoted on the front surface of the horizontal surface (13) at the upper end of the side surface (12), and the lower ends on the left and right sides are hooked on both side surfaces (12). A back cushion material (not shown) is attached to the front surface of the stopped back shell (21).
[0019]
As shown in FIGS. 2 to 4 (the support base and the like are not shown), between the left and right support plates (18) of the back frame (3), The upper piece (22a) of the bracket (22) having a downward U-shape when viewed from the front is fixed by a bolt (23) from the rear surface side of the horizontal rod (14).
[0020]
Between the pair of left and right forward pieces (22b) and (22b) of the bracket (22), there is a rearward U-shaped connecting bracket (25) attached to the upper end of the gas spring (24). It is pivotally attached by a pin (26) facing in the left-right direction that is inserted into the shaft hole with the facing piece (22b).
The lower end of the gas spring (24) is pivotally attached to the rear end of the support base (7).
[0021]
(27) is an operating device for the gas spring (24), which is an operating rod (28) which faces the left and right direction and has a forward crank-shaped bent portion (28a) at the left end, and a front fixed to the right end. As the urging means with the operation lever (29) facing the front and one end (front end) receiving the lower surface of the bent portion (28a), the other end (rear end) is locked to the lower end of the reed (14) The torsion coil spring (30), the holding bracket (31) for holding the torsion coil spring (30), and the holding bracket (31) on the front of the mounting plate (19) of the left mounting bracket (20) In addition, a holding member (33) secured with a screw (32), and a pressing piece (34) in a rearward U-shape in plan view, which is fixed to the left end of the operating rod (28) and facing obliquely rearward and downward. And the left end of the operating rod (28) is rotatably supported by a rear U-shaped holding groove (35) formed at the front ends of both forward pieces (22b) of the bracket (22). ing.
[0022]
As shown in the cross-sectional view of FIG. 5, the intermediate portion of the operation rod (28) has a U-shaped holding portion (36a) facing obliquely downward in a side view of the holding plate (36). It is fitted to the front upper side and is held rotatably by screwing it (32) to the front surface of the right mounting plate (19) via the lower plate (37).
The bent portion (28a) and the operation lever (29) of the operation rod (28) are always urged upward by the torsion coil spring (30).
[0023]
The holding member (33) is an L-shaped base piece (33a) having an insertion hole (38) for the screw (32) fixed to the mounting plate (19), as shown in an enlarged view in FIG. And the standing part is erected on the front end edge, the upper end part is erected on the right end edge of the base piece (33a) and the holding part (33b) bent in a U shape downward in side view, A guide piece (33d) formed by projecting a holding piece (33c) that can contact the upper surface of the base of the bent portion (28a) in the rearward direction, and a front side on the substrate (33a) on the side of the guide piece (33d). It is provided with a stopper piece (33e) that protrudes in an inclined manner and can contact the lower surface of the bent portion (28a) of the operating rod (28), and is integrally formed of synthetic resin. (39) is a reinforcing rib.
[0024]
The size of the opening at the lower end of the holding portion (33b) is slightly smaller than the outer diameter of the operating rod (28), and when the locking shaft portion (28b) of the bent portion (28a) is turned upward. Further, the free end portion of the holding portion (33b) is elastically deformed forward and the opening portion is expanded, so that the locking shaft portion (28b) of the bent portion (28a) is placed in the holding portion (33b). It fits and is held. Further, the projecting dimension of the stopper piece (33e) is set so that the operation lever (29) has an appropriate play until the bent portion (28a) contacts the opening of the holding portion (33b).
[0025]
As shown in FIG. 4, the front surface of the pressing piece (34) comes into contact with and can press the valve operating portion (40) protruding so as to be able to project and retract at the upper end of the gas spring (24). Yes.
7 and 8 show the operation when the operation device (27) is not operated and when operated, respectively.
[0026]
As shown in FIG. 7, when the operating lever (29) is not rotated upward, the bent portion (28a) of the operating rod (28) is urged upward by the force of the torsion coil spring (30), The stop shaft portion (28b) is in contact with the opening of the holding portion (33b) of the holding member (33).
[0027]
In this state, the valve operating portion (40) is not pushed by the pressing piece (34) fixed to the operating rod (28), and the gas spring (24) is inoperative, and the back frame (3) is not operated. Back tilt is prevented.
[0028]
When the operating lever (29) is turned upward, as shown in FIG. 8, the bent portion (28a) of the operating rod (28) is also turned upward, so that the locking shaft portion (28b) is moved. The opening portion of the holding portion (33b) of the holding member (33) is expanded and fitted and held therein.
[0029]
As a result, the valve operating part (40) is pressed by the pressing piece (34) and held in that state. Accordingly, the gas spring (24) is actuated, and the back frame (3) can be freely tilted backward against the internal gas pressure.
[0030]
When stopping the operation of the gas spring (24), rotate the operating lever (29) strongly downwards to disengage the locking shaft (28b) of the bent part (28a) from the holding part (33b). Just do it.
At this time, since the bent portion (28a) is biased upward by the torsion coil spring (30), the impact when the locking shaft portion (28b) is detached from the holding portion (33b) is reduced, Generation of abnormal noise is prevented.
[0031]
As described above, in the above embodiment, the valve operating portion (40) of the gas spring (24) can be directly pushed by the pressing piece (34) fixed to the operating rod (28). Therefore, unlike the conventional wire, there is no slack, and the valve operating section (40) can be reliably pushed over a long period of time.
[0032]
Further, the operation rod (28) is provided with a crank-shaped bent portion (28a), and the locking shaft portion (28b) is elastically inserted into the downward U-shaped holding portion (33b) of the holding member (33). The valve operating section (40) can be held in a pressed state with a simple mechanism that is simply fitted to the valve.
[0033]
Further, since the torsion coil spring (30) biases the locking shaft portion (28b) of the operating rod (28) upward, the holding force of the holding portion (33b) in the holding member (33) is reduced. As a result, the engagement / disengagement of the locking shaft portion (28b) into the holding portion (33b) becomes light, and the generation of impact sound can be suppressed. Moreover, the operation lever (29) does not rattle in the vertical direction.
[0034]
In the above embodiment, the crank-shaped bent portion (28a) is provided at the left end portion of the operating rod (28), but an intermediate portion of the operating rod (28), for example, the operating lever (29) and the pressing piece. (34) may be bent in a crank shape and provided at that portion.
In some cases, the torsion coil spring (30) may be omitted.
[0035]
【The invention's effect】
According to the first aspect of the present invention, the valve operating portion of the gas spring is reliably pushed by the pressing piece fixed to the operating rod by turning the operating lever upward.
Further, the valve operating portion can be held in a pressed state by a simple mechanism in which a crank-shaped bent portion is provided on the operating rod and the engaging shaft portion is fitted into the holding portion of the holding member.
[0036]
According to the second aspect of the present invention, the operating shaft of the operating rod is fitted into the downward U-shaped holding portion and is elastically held by merely slightly turning the operating lever upward. .
[0037]
According to the third aspect of the present invention, the operation lever can be rotated with appropriate play, and the operability is improved.
[0038]
According to the fourth aspect of the present invention, the bent portion is separated from the attachment portion of the gas spring, there is no possibility of interfering with it, and the degree of freedom in designing the attachment position of the gas spring and the back frame is increased.
[0039]
According to the fifth aspect of the invention, the impact when the locking shaft portion of the operating rod is detached from the holding portion is mitigated and the holding force of the holding portion can be reduced, so that the operation of the operating rod becomes light. , Generation of abnormal noise can be suppressed.
[Brief description of the drawings]
FIG. 1 is a side view of a reclining chair to which the present invention is applied.
FIG. 2 is an exploded perspective view of the operating device of the present invention and a back frame to which the operating device is mounted.
FIG. 3 is a plan view of the back frame when the operating device is mounted.
4 is a vertical side view taken along the line IV-IV in FIG. 3;
5 is a longitudinal side view taken along line VV in FIG.
FIG. 6 is an enlarged perspective view of a holding member.
7 is a longitudinal side view taken along line VII-VII in FIG. 3, and is an explanatory view showing an operation when the operation lever is not operated.
FIG. 8 is a longitudinal side view of the same portion as FIG. 7 showing the operation when the operation lever is operated.
[Explanation of symbols]
(1) Leg
(2) Seat
(3) Back frame
(4) Backrest
(5) Leg
(6) Pillar
(7) Prop
(8) Underframe
(9) Cushion
(10) Yokohama
(11) Recessed hole
(12) Side rod
(13) (14) Yokohama
(15) Support rod
(16) Bearing bracket
(17) Recessed hole
(18) Support plate
(19) Mounting plate
(20) Mounting bracket
(21) Back shell
(22) Bracket
(22a) Upper piece
(22b) Forward piece
(23) Bolt
(24) Gas spring
(25) Connecting bracket
(26) Pin
(27) Operating device
(28) Operation rod
(28a) Bending part
(28b) Locking shaft
(29) Control lever
(30) Torsion coil spring (biasing means)
(31) Retaining bracket
(32) Screw
(33) Holding member
(33a) Base piece
(33b) Holding part
(33c) Presser piece
(33d) Guide piece
(33e) Stopper piece
(34) Pressing piece
(35) Holding groove
(36) Holding plate
(36a) Holding part
(37) Lower plate
(38) Insertion hole
(39) Rib
(40) Valve operation part

Claims (5)

A valve projecting on the back frame side of the gas spring is provided with a gas spring provided between the support base and the back frame, with the front end lower part of the back frame having a backrest pivoted to the support base at the upper part of the leg. In the gas spring operating device of the chair, in which the backrest is tilted backward by operating the gas spring by pushing the operating portion,
The back frame has a substantially crank-shaped bent portion in place, an operation lever that can be rotated in the vertical direction at one end, and a pressing piece that can press the valve operation portion is fixed to the middle portion. An operation rod that faces the left and right directions is provided so as to be rotatable, and when the valve operation portion is pushed, a holding shaft portion parallel to the operation rod in the bent portion is detachably fitted. A gas spring operating device for a chair, wherein a holding member having a portion is provided at an appropriate position of the back frame. The holding portion of the holding member is substantially U-shaped in a side view in which the size of the opening at the lower end is slightly smaller than the outer diameter of the locking shaft, and the opening is elastic when the locking shaft is rotated upward. The gas spring operating device for a chair according to claim 1, wherein the locking shaft portion can be held in the holding portion by being deformed and expanded. When the operation lever is not operated, the lower end of the bent portion comes into contact with the upper surface of the base piece facing the lower surface of the bent portion of the operating rod in the holding member, so that the locking shaft portion rotates excessively downward. The gas spring operating device for a chair according to claim 1 or 2, wherein a stopper piece for preventing the above is provided. The gas spring operating device for a chair according to any one of claims 1 to 3, wherein a crank-shaped bent portion is provided at a side end portion of the operating rod. The gas spring operating device for a chair according to any one of claims 1 to 4, further comprising an urging means for urging the crank-shaped bent portion upward.

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