JPH0527882Y2 - - Google Patents

Description

[Detailed explanation of the idea] (Industrial application field) The present invention relates to a chair lifting device.

(Prior art) Figure 3 shows a chair in which the height of the seat can be freely adjusted by raising and lowering the seat.
It can be operated by pushing down the ring body 10 and tilting the ring body 10.

A gas spring 14 is attached to the lower surface of the seat 12 as a pillar.
The lower end portion thereof is fitted into and fixed to the base of the leg portion 16. The ring body 10 is connected to and supported by the lower end of the gas spring 14 via a ring receiver 18.

FIG. 2 is an explanatory diagram showing a state in which the ring body 10 and the gas spring 14 are connected. A support body 20 formed in a cylindrical shape is attached to the base of the leg part 16 so that the lower part thereof is connected to the leg part 1.
The lower end of the gas spring 14 is fitted into the tapered surface of the inner wall of the support body 20 .

A base end of the ring receiver 18 is connected to a ring receiver mounting body 22, and the ring receiver mounting body 22 is supported from below by a pusher fitting 24.
The push metal fitting 24 is supported by adjusting the vertical position by an adjustment bolt 28 screwed into a support metal fitting 26 fixed to the support body 20. A spherical seat with a spherical top is protruded from the upper surface of the pusher fitting 24, and a concave seat abutting the spherical seat is provided on the lower surface of the ring receiving body 22.

A push valve body 30 protrudes from the lower end surface of the gas spring 14 , and the tip of the push valve body 30 is in contact with the upper surface of the ring receiving body 22 .
The upper surface of the ring receiving body 22 is formed such that the center portion is concave and the peripheral portion bulges upward. Normally, the ring receiving mounting body 22 is pressed between the push fitting 24 and the push valve body 30 is in a protruding state.

When raising and lowering the seat portion 12, the ring body 10 is tilted as shown in FIG. When the ring body 10 tilts, the ring receiving body 22 tilts on the spherical seat, and the push valve body 30, which is in contact with the top surface of the ring receiving body 22, bulges out while contacting the top surface of the ring receiving body 22. As a result, the push valve body 30 is pushed up and pushed in.

The operation of tilting the ring body 10 can be performed by the user operating the ring body with his or her feet, so the operation is extremely easy. In particular, since the seat can be raised and lowered without the use of hands, it is effectively used in chairs used by hospital doctors during surgery or treatment.

(Problem to be solved by the invention) The above chair allows the seat to be easily raised and lowered by the user's foot operation, but due to the structure, the ring body 10
Since the ring can be tilted significantly, a problem arises in that when the ring receiving body 22 is tilted on the spherical seat, the ring receiving body 22 comes into contact with the main body of the gas spring 14.

That is, when the ring body 10 is stepped on, the ring receiving body 22 rotates on the spherical seat, but there is no particular stopper attached to restrict the rotation of the ring receiving body 18, and when the ring receiving body 18 is tilted, the ring receiving body 22 rotates on the spherical seat. Also, since there is a gap a between the opening in the side wall of the support body 20 and the ring receiver 18 as shown in FIG. It will be tilted. The ring receiving body 22 is the gas spring 14
When it comes into contact with the main body of the gas spring 14, a force acts to push the main body of the gas spring 14 up, which may cause the main body of the gas spring 14 to come off from the support body 20.

As a method to solve the above problem, there is a method to eliminate the gap a part and make the edge of the opening of the support body 20 act as a stopper, or a method to push up the push metal fitting 24 with the adjustment bolt 28 to increase the rotatable angle range. There are ways to limit it. however,
The former method of eliminating the gap a has the problem that the push valve body 30 cannot be pushed the required amount due to variations in the fit between the gas spring 14 and the support body 20. However, there is a problem in that the push valve body 30 may not return to the required position and may become unstable.

Therefore, the present invention was devised to solve the above-mentioned problems, and its purpose is to prevent the gas spring body from being pushed up even when the ring body is tilted significantly, and to seat the gas spring body. The purpose of the present invention is to provide a chair lifting device that allows for more reliable lifting and lowering operations.

(Means for Solving the Problem) The present invention has the following configuration to achieve the above object.

That is, a gas spring is installed as a pillar on the leg of the chair, and a ring body is provided around the gas spring at a mid-height position between the seat and the leg to raise and lower the seat concentrically with the gas spring. The gas spring is fixed to the leg, into which the lower end of the gas spring is fitted, and is supported on a spherical seat provided at the bottom of the support that extends in a cylindrical shape below the leg, and protrudes from the lower end of the gas spring. The ring body is supported so as to be tiltable through a ring receiver connected to a ring receiving body which is pressed and supported under pressure by the push valve body to be inserted, and by tilting the ring body, the ring receiving body In a chair lifting device configured to tilt on a spherical seat surface and push a push valve body, a chair is supported between the ring receiver body and the push valve body, and is supported between the ring receiver body and the push valve body. A push plate is provided so that it can move up and down inside the body, and when the ring body is tilted and the push valve body is pushed through the push plate by the tilted ring receiving body, the upper surface of the push plate that is moved upward becomes a gas spring. The present invention is characterized in that a stopper is provided to restrict the upward movement position of the push plate so that it does not come into contact with the lower end surface.

(Function) The ring body is tilted by the user's foot operation, and by tilting the ring body, the ring receiving body tilts on the spherical seat, pushes up the push plate, and the push plate pushes against the push valve body. The gas spring locking mechanism is operated by pushing in. Since the push plate is restricted by coming into contact with the stopper, it does not move upward beyond a certain position, so even if the ring body is tilted more than necessary, it will not affect the gas spring body.

(Embodiments) Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings.

FIG. 1 is an explanatory diagram showing the main parts of the chair lifting device according to the present invention. Note that in the drawings, members designated by the same numbers as those in the conventional example are the same as those in the conventional example described above, and therefore the description thereof will be omitted.

In this embodiment, the gas spring 1 is similar to the conventional example.
4 is fixed to the leg part 16 via the support body 20, and the casing part 20a is provided to extend below the leg part 16. However, when the gas spring 14 is fitted into the support body 20, the casing 20a and the support body At least the gas spring 1 is
4 Install so that the bottom end of the main unit does not protrude. In the illustrated embodiment, the surface of the stepped portion 21 and the lower end surface of the gas spring 14 body are made to coincide with each other.

The casing portion 20a is provided with elongated holes in the vertical direction corresponding to the arrangement positions of the ring receivers 18 so that the ring receivers 18 can pass therethrough and the ring receivers 18 can be tilted in a vertical plane.

Note that the casing portion 20a may be formed integrally with the support body 20, or may be formed separately from the support body 20 and fixed to the support body 20.

Further, in the conventional example, the ring receiving body 22 was supported on the spherical seat of the pusher fitting 24, but in the embodiment, an adjustment bolt 28 is attached to the center of the support fitting 26 fixed to the bottom of the casing part 20a.
with the tip facing upward, and then tighten the adjustment bolt 2.
The ring receiving body 22 is supported on the tip of the ring 8.

In addition, the ring receiving body 22 and the push valve body 3
A push plate 32 is provided in the middle of 0. The push plate 32 is inserted with some play between it and the inner wall of the casing portion 20a. The upper surface of the push plate 32 is formed in a flat shape, and a convex spherical surface portion 22 is provided at the center of the lower surface of the push plate 32 so as to bulge downward. Normally, the push valve body 30 is connected to the push plate 3.
2, the convex spherical surface portion 32a of the push plate 32 abuts the concave surface of the upper surface of the ring receiving body 22, and the push plate 32 is pinched from above and below.

When adjusting the height position of the seat, the ring receiver 18 is tilted by pushing down the ring body with the foot, as in the conventional example. As the ring receiver 18 tilts, the ring receiver mounting body 22 tilts, and accordingly, the ring receiving mounting body 22 pushes up the convex spherical surface portion 32a of the push plate 32 as shown in the figure. The pushed up push plate 32 pushes the push valve body 30 with its upper surface, and when the push valve body 30 is pushed in a predetermined amount, the locking mechanism of the gas spring 14 is released and the seat can be raised and lowered. .

In the case of the chair elevating device of this embodiment, the push valve body 30 is pushed through the push plate 32, so even if the ring body is tilted more than necessary, the push plate 32 will not move. Step portion 21
The upper movement position of the gas spring 14 is restricted by contact with the gas spring 14, and the gas spring 14 body is not pushed up directly. That is, the stepped portion 21 functions as a stopper for regulating the upward movement position of the push plate 32 in relation to the push plate 32. Therefore, in addition to providing a stepped portion on the inner wall of the support body 20 as in the above embodiment, a protruding stopper for regulating the upward movement position of the push plate 32 may be provided on the side wall within the support body. Also, the push plate 32
A protrusion may be provided at the portion that contacts the stepped portion 21 so that the upper surface of the push plate 32 does not come into contact with the lower surface of the gas spring main body.

Note that since the convex spherical surface portion 32a of the push plate 32 and the ring receiving body 22 abut on the curved surface portion,
The operation of pushing up the push plate 32 can be performed smoothly. In addition, the molding accuracy of each part is not required so much, and it is only necessary to manage the fitting part of the gas spring 14 and the support body 20 so that the lower end surface of the gas spring 14 does not protrude beyond the stepped part 21, and the management is extremely easy. It's easy to do. Also, adjust bolt 2
Since the reference numeral 8 is for floating the ring receiving mounting body 22 and using it as a fulcrum, there is no particular need for adjustment during installation.

The present invention has been variously explained above using preferred embodiments, but the present invention is not limited to these embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. That's true.

(Effects of the invention) According to the chair lifting device according to the invention, as described above, by restricting the pushing up action on the gas spring body by the push plate, there is no problem when the ring body is tilted more than necessary. However, it can eliminate any negative effects on the chair and increase its durability. Further, structurally, there is no need for so much precision in each component, and adjustments during assembly and installation can be easily made.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing the main parts of the chair elevating device according to the present invention, Fig. 2 is an explanatory diagram showing a conventional example of the chair elevating device, and Fig. 3 shows a chair equipped with the chair elevating device. FIG. 10... Ring body, 12... Seat part, 14... Gas spring, 16... Leg part, 18... Ring receiver, 20... Support body, 20a... Casing part,
21...Step part, 22...Ring receiving body, 2
4... Push metal fittings, 26... Support metal fittings, 28...
...Adjustment bolt, 30...Push valve body, 32...
Push plate, 32a... Convex spherical surface part.

Claims (1)

[Claim for Utility Model Registration] A gas spring is installed as a pillar on the leg of a chair, and the seat is raised and lowered concentrically around the gas spring at a mid-height position between the seat and the legs. A ring body is provided, which is fixed to the leg, into which the lower end of the gas spring is fitted, and which is supported on a spherical seat provided at the bottom of the support that extends in a cylindrical shape below the leg. The ring body is supported so as to be tiltable through a ring receiver connected to a ring receiving body which is pressed and supported under pressure by a push valve body which protrudes in and out from the lower end surface of the spring, and the ring body is tilted. Therefore, in the chair lifting device configured such that the ring receiving body tilts on the spherical seat surface to push the push valve body, the ring receiving body and the push valve are located between the ring receiving body and the push valve body. A push plate is provided which is sandwiched between the body and can move up and down within the support body. A chair elevating device comprising a stopper for regulating the upward movement position of a push plate so that the upper surface of the plate does not come into contact with the lower end surface of a gas spring.