JPH0734068Y2 - Oil-filled shock absorber for elevator - Google Patents

Description

The present invention relates to an oil-filled shock absorber for an elevator, and more particularly to an oil-filled shock absorber capable of preventing oil from flowing out during a shock absorbing operation. .

[Conventional technology]

An example of a conventional elevator oil-filled shock absorber will be described with reference to FIG. 2. A cylinder 1 and a plunger 2 that slides on the inner surface of the cylinder 1, a return spring 7 that returns the plunger 2 after operation, and a center of the bottom of the plunger 2 are provided. And a control rod 6 penetrating through the oil jet hole 5, and when the plunger 2 is pushed down, the oil pressure generated by the jet effect of the oil 8 in the cylinder 1 from the oil jet hole 5 causes the plunger to move. A car or a counterweight (hereinafter, referred to as a "falling body") that has fallen onto 4 is braked. In this prior art, the air hole 9 is provided in the upper part of the plunger 2 so that the air in the plunger 2 is released to the outside during the buffering operation.

In this conventional technique, there is a problem that the oil 8 jetted from the oil jet hole 5 flows out from the air hole 9 to the outside during the buffering operation.

As a conventional technique for preventing the oil 8 from flowing out during the buffering operation, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 58-45264.

[Problems to be solved by the device]

However, the conventional technique disclosed in Japanese Utility Model Laid-Open No. 58-45264 can be directly applied to an existing oil-filled shock absorber for an elevator having a structure in which the plunger 2 has an air hole 9 as shown in FIG. Not a thing. Therefore, in order to apply the conventional technique to an elevator equipped with an existing product, the entire existing product must be replaced.

The present invention has been made in view of the above-mentioned circumstances in the prior art, and an object thereof is an elevator capable of preventing oil from flowing out to the outside at the time of a buffering operation in a device having an air hole in an upper portion of a plunger. To provide an oil-filled shock absorber.

[Means for Solving the Problems]

To achieve this object, the present invention provides a cylinder, an air hole in the upper part, a plunger oil hole in the bottom part, which slides on the inner surface of the cylinder, a return spring supporting the plunger, and a plunger bottom part. Equipped with a control rod that penetrates through the oil spray hole, it hits the plunger due to the passage resistance when ejecting from the inside of the cylinder through the oil spray hole as the volume inside the cylinder decreases when the plunger is pushed down. In an oil-filled shock absorber for an elevator that brakes a falling body in contact with it,
An anti-scattering body is provided at the tip of the control rod to prevent upward spraying of oil jetted upward from the oil spray hole, and a dust seal attached around the anti-scattering body and abutting the inner surface of the plunger. Is provided.

[Action]

The dust seal installed around the anti-scattering body at the tip of the control rod closes the gap formed between the anti-scattering body and the inner wall surface of the plunger. The splash of the injected oil is prevented. As a result, the oil that is about to be ejected from the oil injection hole to the upper side of the plunger is diverted to the bottom direction of the plunger. Therefore, it is possible to reliably prevent the oil from flowing out from the air hole provided in the upper portion of the plunger.

〔Example〕

 An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, those having the same reference numerals as those shown in FIG. 2 are equivalent members, but in the present invention, in particular, a disc-shaped shatterproof body 12 is provided at the tip of the control rod 6 via a jispi 10. Is provided, and a dust seal 11 that contacts the inner surface of the plunger 2 is provided around the scattering prevention body 12.
The mounting height H ₀ of the jispi 10 and the anti-scattering body 12 provided at the tip of the control rod 6 must be smaller than the dimension H from the bottom of the plunger 2 to the bush 3 (H>
H ₀ ).

In this embodiment, a falling body (not shown) drops on the lid 4, and when the plunger 2 is pushed down, the oil 8 in the cylinder 1 passes through the injection oil hole 5 and is ejected to generate an orifice effect. At that time, the oil 8 ejected from the oil injection hole 5 collides with the anti-scattering body 12 and the dust seal 11, and flows back to the bottom of the plunger 2. Further, especially when the oil 8 collides with the splash preventer 12 and the dust seal 11, the oil 8 which is about to splash to the upper part of the plunger 2 from the gap G between the splash preventer 12 and the inner surface of the plunger 2 is The dust seal 11 sliding on the inner surface prevents the outflow. Therefore, the oil 8 does not flow out from the air hole 9.

In the embodiment configured as described above, the oil 8 after being ejected from the oil injection hole 5 is sealed by the scattering prevention body 12 and the dust seal 11, so that the original performance of the oil-filled shock absorber for the elevator is maintained. Moreover, it is possible to prevent the oil 8 from flowing out during the buffering operation, and it is possible to provide a highly reliable oil-filled buffer.
As a result, the spilled oil does not contaminate the pit and the maintainability can be improved.

It should be noted that this embodiment is the same as the prior art shown in FIG.
12 and a dust seal 11 are added, and therefore, it can be easily applied to an existing oil-filled shock absorber as shown in FIG.

[Effect of device]

According to the present invention, it is possible to provide an oil-filled shock absorber in which oil can be prevented from flowing out to the outside during the buffering operation by the scattering prevention member and the dust seal, and the pit is not contaminated by the oil.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an elevator oil-filled shock absorber according to the present invention, and FIG. 2 is a sectional view showing a conventional elevator oil-filled shock absorber. 1 ... Cylinder, 2 ... Plunger, 3 ... Bush,
4 ... Lid, 5 ... Oil jet hole, 6 ... Control rod, 7 ... Return spring, 8 ... Oil, 9 ... Air hole, 10 ... Jispi, 11 ... Dust seal, 12 ... Scatter prevention body.

Claims (1)

[Scope of utility model registration request] 1. A cylinder, a plunger having an air hole above and a spray oil hole at the bottom and sliding on the inner surface of the cylinder, a return spring supporting the plunger, and a spray oil hole at the bottom of the plunger. An elevator equipped with a control rod that brakes the falling body that comes into contact with the plunger due to the passage resistance when ejecting from the inside of the cylinder through the oil hole as the volume of the cylinder decreases when the plunger is pushed down. In the oil-immersed shock absorber, a scattering prevention member is provided at the tip of the control rod to suppress upward scattering of the oil ejected upward from the spray oil hole, and is mounted around the scattering prevention member. An oil-filled shock absorber for an elevator, comprising a dust seal that comes into contact with the inner surface of the plunger.