JPH0542770Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of an operating device for pressing a gas spring release valve in a seat plate tilting device using a gas spring.

[Conventional technology]

Conventionally, when configuring the seat plate of a chair to be able to freely tilt backwards, a gas spring was used as a buffer against the backward tilting of the seat plate, and the release valve of the gas spring was configured to be freely pressable with an operating lever. Configuring the inclination angle to be adjustable is disclosed in Japanese Patent Publication No. 59-49802 as a prior art.

That is, in this prior art, a seat plate support is pivotally attached to a support frame fitted to the upper end of a pedestal so that it can freely tilt backwards, and a gas spring extending in the front-rear direction is attached to the support frame. The seat plate support is configured to tilt backward against the spring force, and is rotatable around an axis substantially perpendicular to the axis of the gas spring in the support frame near the release valve at the front end of the gas spring. By pivotally supporting the operating lever in this manner, integrally fixing a pressing member extending radially outward to the rotating shaft of the operating lever, and making this pressing member face so as to come into contact with the release valve. , the release valve was directly pressed by rotating the operating lever.

[The problem that the idea aims to solve]

However, in this configuration in which the release valve is directly pressed by the operating lever, the operating lever must be placed close to the gas spring's release valve, and the mounting position of the operating lever may not match the mounting position of the gas spring. As a result, there was a risk that the operability of the operating lever would deteriorate.

In order to eliminate this inconvenience,
In the publication, between the operating lever and the release valve,
A device has been proposed in which a press fitting that is approximately L-shaped when viewed from the side and is movable up and down is arranged so that there is a distance between the operating lever and the release valve.

However, in this case, when operating the gas spring release valve, the press fitting, which is approximately L-shaped in side view, moves up and down, so the space required for its rotation, especially the vertical height, becomes large.
It becomes bulky.

In addition, since the release valve is pressed by rotating the pressing body, the direction in which force acts on the release valve changes as the operating lever rotates, which prevents the release valve from becoming twisted. There is also a possibility that this may occur, making it impossible to perform the pressing operation smoothly.

The present invention aims to solve the above-mentioned problems in a seat plate tilting device using a gas spring.

[Means to solve the problem]

In order to achieve the above object, in the present invention, the seat plate support to which the seat plate is attached is pivotally mounted to the support frame attached to the upper end of the pedestal so as to be tiltable backwards, and the support frame or the seat plate support has a , a seat tilting device for a chair comprising a gas spring for adjusting the inclination angle of the seat support, the axis of which is attached to extend in the front-rear direction; a support frame or a seat support to which the gas spring is attached; The operating lever is rotatably supported around an axis substantially orthogonal to the axis of the gas spring, and an operating lever is mounted on the support frame or seat plate support body to which the gas spring is attached, and the operating lever is mounted on a pressing portion thereof. is mounted so as to be in contact with the release valve of the gas spring, and is mounted so as to be movable linearly substantially perpendicular to the rotational axis of the operating lever, and the engagement member fixed to the operating lever and the operating rod The operating rod is engaged with the release valve so that it moves linearly in the direction toward and away from the release valve by rotating the operating lever, while the supporting frame or the seat plate support is provided with an engaging member. The configuration includes an elastic locking piece for selectively holding the rotation angle of the operating lever by engaging and disengaging it.

[Functions and effects of the idea]

In this configuration, when the operating lever is rotated, the operating rod moves linearly via the engaging member attached to it, and the release valve is pressed by the pressing part of the operating rod, and the inclination angle of the seat plate is adjusted. It is adjustable, but
The release valve is not pressed directly by the operating lever, but indirectly via the operating rod, and the moving direction of the operating rod is in a direction that intersects the rotation axis of the operating lever. This allows the release valve of the gas spring to be separated from the operating lever. Therefore, the mounting position of the operating lever can be freely set in relation to the gas spring by changing the length and height of the operating rod.

Therefore, according to the present invention, the mounting position of the operating lever can be freely set regardless of the mounting position of the gas spring, and the operating lever can be mounted at the location where it is most easily operated. Even with such a structure, the tilting operation of the seat plate can be performed extremely easily.

Furthermore, since the actuating rod is moved linearly, compared to conventional rotating press fittings, the space required for actuation, especially the vertical height, can be reduced, making it possible to reduce the space below the seat of the chair. This has the effect of reducing the vertical height of the support frame or seat plate support.

Moreover, since the operating rod can be moved linearly in the same direction as the axis of the gas spring, the release valve will not be strained, so the inclination angle of the seat plate can be adjusted easily and reliably. It also has the effect of being able to do so.

In addition, since the rotation angle of the engaging member attached to the operating lever can be selectively maintained by an elastic locking piece provided on the support frame or seat plate support, the operator can rotate the operating lever. This also has the effect that the operating state can be easily perceived.

〔Example〕

Next, the first embodiment of the present invention is shown in the drawings (1st to 3rd).
To explain based on the figure), the reference numeral 1 in the figure
1 shows a support frame attached to the upper end of the pedestal 2, and a seat plate support 3 having an upwardly U-shaped cross section and having a seat plate (not shown) attached to the upper surface is attached to the front end of the support frame 1. The front end is pivotally supported via a pivot 4 so as to be vertically movable, and a front and rear elongated hole 5 is bored in the left and right side plates of the seat plate support 3, and a slide is inserted through the elongated hole 5. Both ends of the shaft 6 and the support frame 1 are rotatably connected via a pair of left and right link rods 7.

Furthermore, a pin 9 is attached to the rear end of the seat support 3 so that the lower end of the backrest support rod 8 can be rotated back and forth.
The backrest support rod 8 is pivotally mounted on the seat back support 3 and a pin 8a inserted into the lower end of the backrest support rod 8 is rotatably connected to the slide shaft 6 via a pair of left and right connecting plates 10. Therefore, the seat back support 3 and the backrest support rod 8 tilt backward together around the pivot shaft 4, and the backrest support rod 8 also tilts backward relatively to the seat back support 3. In other words, the backrest support rod 8 tilts backward at a larger angle than the seat back support 3.

Reference numeral 11 indicates a gas spring that is a buffer means for the seat plate support 3 and the backrest support rod 8, and the gas spring 11 is connected to the cylinder 11a.
and a piston rod 11b fitted therein, and the base of the cylinder 11a is pivotally connected to the base of the left and right connecting plate 10 by a pin 12 so as to be vertically movable. A bracket 13 having an upward U-shape in front view is fixed to a portion near the front end, and a connecting member 15 having a U-shape in plan view is pivotally connected to the bracket 13 by a pin 14.
, the piston rod 1 of the gas spring 11
1b, and a release valve 11c is provided to protrude forward from the front end surface of the piston rod 11.

In addition, a left and right longitudinal operating lever 16 is pivotally supported at the front end of the bottom plate 3a of the seat plate support 3 via a pair of left and right brackets 17 so as to be rotatable about its axis. Plate support 3
An operating rod 18 having an L-shape in side view with its rear end bent upward is attached to a portion near the front end of the bottom plate 3a so as to be slidable back and forth via a guide plate 19. The bent portion 18a of the operating lever 18 faces the release valve 11a of the gas spring 11, while the tip of the operating rod 18 is located below the rotating shaft 16a of the operating lever 16.

The operating lever 16 and the operating rod 18 are interlocked via an interlocking means consisting of a protrusion and an engagement hole, and by rotating the operating lever 16, the operating rod 18 is
8 is configured to move back and forth. That is, an engagement hole 20 is formed at the tip of the operating rod 18, and a downward engagement protrusion 21a is formed on the engagement member 21 fitted to the rotation shaft 16a of the operation lever 16, and this The engagement hole 20 of the operating rod 18 is engaged with the operating rod 18, so that the operating rod 18 can move back and forth in conjunction with the rotating operation of the operating lever 16, and can press the release valve 11c.

Note that since the release valve 11c is biased in the projecting direction and always biases the operating rod 18 forward, the downward engaging protrusion 21a is only brought into contact with the front end surface of the operating rod 18, and the operating rod 18 is Only the backward movement may be performed using the operating lever 16.

Further, a horizontal protrusion 21b is provided on the engaging member 21 fitted on the rotation shaft 16a of the operating lever 16, and an elastic member is provided on the bracket 17, which can be freely engaged with and detached from the horizontal protrusion 21b. Locking piece 2
2 and configured to selectively maintain the rotating position of the operating lever 16, the gas spring 11 can be placed in a locked state with the release valve 11c protruding and in an unlocked state with the release valve 11c pushed in. It is possible to selectively hold the state.

In the above configuration, the support frame 1 and the seat plate support 3
and the link rod 7 constitute a link mechanism, and
A link mechanism is constituted by the backrest support rod 8, the connecting plate 10, and the gas spring 11, and the lower end of the backrest support rod 8 is stretched against the seat plate support 3 via the gas spring 11. , the seat plate support 3 and the backrest support rod 8 are inclined backward against the elasticity of the gas spring 11.

Therefore, rotate the operating lever 16 in the direction A,
Pressing the release valve 11c via the operating rod 18,
By unlocking the gas spring 11 and changing the protruding dimension of the piston rod 11a, the inclination angle of the seat plate support 3 and the backrest support rod 8 (therefore, between the seat plate and the backrest) can be freely adjusted. When the gas spring 11 is in the locked state, the seat plate support 3 and the backrest support rod 8 are tilted backward by a certain angle due to the cushioning action of the gas spring 11 when a load is applied.

Thus, the release valve 11c is pushed indirectly through the operating rod 18, and by changing the length of the operating rod 18, the mounting position of the operating lever 18 can be freely set in relation to the gas spring 11. Therefore, the operating lever 16 can be installed at the most convenient position regardless of the installation position of the gas spring 11, and the operating lever 18 can move linearly along the axis of the gas spring 11. Therefore, the release valve 11c that is pressed by this does not become strained, and the inclination of the seat plate can be reliably adjusted with a light force.

4 to 6 show a second embodiment, in which the gas spring 11 is attached to the support frame 1.

That is, a pin 9 is attached to the rear end of the seat plate support 3 so that the lower end portion of the backrest support rod 8 can be freely rotated back and forth.
A slide shaft 6a, which is pivotally mounted and provided at the lower end of the backrest support rod 8, is inserted into the elongated hole 5 on the left and right sides of the support frame 1 so as to be movable back and forth, and the base of the cylinder 11a of the gas spring 11 is moved up and down on the slide shaft 6a. On the other hand, a connecting member 15 is pivotally connected to a bracket 13 fixed to the bottom surface of the support frame 3 with a pin 14 so as to be freely movable up and down, and the piston rod 11b of the gas spring 11 is attached to the connecting member 15. By screwing the seat plate support 3 and the backrest support rod 8
is configured to tilt backward against the spring force of the gas spring 11.

Then, the operating lever 16 and the operating rod 18 are interlocked via the same interlocking means as in the first embodiment,
The operating rod 18 is configured to be movable back and forth by rotating the operating lever 16, so that the release valve 11c of the gas spring 11 can be pressed.

In this embodiment as well, the operating lever 16 can be selectively positioned between the locking position and the unlocking position of the seat plate by engaging and disengaging the locking piece 22 formed on an elastic plate such as a leaf spring with the horizontal protrusion 21b. I'm trying to keep it. It goes without saying that the interlocking means for interlocking the rotation of the operating lever 16 and the back and forth movement of the operating rod 18 is not limited to the embodiment, and may be of other constructions, such as one using a rack and pinion.

In addition, if the rotation of the operating lever 16 is configured to be selectively locked using the locking piece 22 made of an elastic plate as in both of the above embodiments, the operating lever 1
It is possible to reliably prevent the seat plate from tilting unexpectedly during work due to the unexpected rotation of the operating lever 1.
Since the release valve 11c can be kept pressed without continuing to hold the release valve 11c with the hands, and the angle of the seat plate can be adjusted with both hands, there is an advantage that the angle of the seat plate can be adjusted very easily. In this case, the operating lever 16
As shown in FIG. 7, the locking means may be configured such that a locking piece 23 made of an elastic plate is engaged with and disengaged from an engagement groove 24 formed on the outer surface of the engagement member 21.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan view of the main part of the first embodiment, FIG. 2 is a cross-sectional view taken from FIG. A plan view of the second embodiment, FIG. 5 is a sectional view taken from - in FIG. 4,
FIG. 6 is a sectional view taken along the line shown in FIG. 4, and FIG. 7 is a diagram showing another example of the locking means of the operating lever. 1... Support frame, 2... Pillar, 3... Seat plate support, 7... Link rod, 8... Backrest support rod, 1
0... Connection plate, 11... Gas spring, 11c
...Release valve, 16...Operation lever, 16a...
... Rotation shaft, 18 ... Operating rod, 20 ... Engagement hole, 2
1... Engaging member, 21a... Downward engaging protrusion, 2
1b... Lateral protrusion, 22, 23... Locking piece.

Claims (1)

[Scope of utility model registration request] A seat plate support to which the seat plate is attached is pivotally attached to a support frame attached to the upper end of the pedestal so as to be tiltable backwards, and the support frame or the seat plate support has a mechanism for adjusting the inclination angle of the seat plate support. In a seat tilting device for a chair, the operating lever is attached to a support frame or a seat support body to which the gas spring is attached, and the operating lever is attached so that the axis of the gas spring extends in the front-rear direction. The support frame or the seat plate support body to which the gas spring is mounted is rotatably supported around an axis substantially orthogonal to the gas spring, and the operating rod has an operating rod whose pressing portion contacts the release valve of the gas spring. The operating lever is mounted so that it can be moved linearly substantially orthogonally to the rotational axis of the operating lever, and the engaging member fixed to the operating lever and the operating rod are connected by rotation of the operating lever. The actuating rod is engaged with the release valve so as to move linearly in the approaching/disengaging direction, while an engaging member is engaged with and disengaged from the support frame or the seat plate support to control the rotation angle of the operating lever. An operating device for a seat tilting device for a chair, characterized in that a locking piece made of an elastic body is provided for selectively holding the seat.