JPH05139654A - Oiled buffer of elevator - Google Patents

Abstract

PURPOSE:To smooth the process of assembling an oiled buffer of an elevator so as to enhance safety by mounting a horizontal member on the upper portion of a plunger, and mounting vertically freely movable guide shoes at both ends of the horizontal member in such a manner that the guide shoes hold the guide rails of a cage. CONSTITUTION:A horizontal member 20 is mounted on the upper portion of the plunger 5 of a buffer and guide shoes 21 are mounted to both ends of the horizontal member 20. Guide rails 22 erected at both ends of a cage 10 are held by the guide shoes 21 so that the shoes 21 are movable only in the vertical direction. Therefore when the cage 10 is lowered and collides against the apex portion of the plunger the plunger 5 is not horizontally displaced even when exerted with unbalanced loads and the safety of the buffer is significantly enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator oil-filled shock absorber.

[0002]

2. Description of the Related Art An elevator has a car or a counterweight to descend into a pit at the bottom of a hoistway without being electrically or mechanically restrained for some reason. A shock absorber is provided to stop the car or counterweight. FIG. 3 is a cross-sectional view of a conventional oil-filled shock absorber. In the figure, 1 is a cylinder vertically fixed to the bottom of a hoistway of an elevator, 2 is hydraulic oil filled in the cylinder 1, 3 is the center of the cylinder 1. A control rod fixed to the upper part and formed in a slender shape upward, 4 is a spring bearing plate fixed to the top of the control rod, 5 is a hollow cylindrical plunger inserted in the cylinder 1, and 5a is a lower part of the plunger. Orifice hole, 6 is an upper plate that closes the upper portion of the plunger 5, 6a is an air hole formed in the upper plate 6, 7 is a buffer rubber fixed to the upper surface of the upper plate 6, and 7a is a buffer rubber. The air hole 8 is stored in the plunger 5, and the plunger 5
A spring 9 acting to push up the elevator shaft, 9 is the base surface of the lower pit of the elevator hoistway.

Next, the operation will be described. When the car or the counterweight is lowered due to a failure of the elevator or the like, the bottom portion thereof collides with the cushion rubber 7 on the upper portion of the shock absorber, and the plunger 5 is pushed down. At this time, the hydraulic oil 2 is jetted upward through the gap between the orifice hole 5a of the plunger 5 and the control rod 3. By controlling the flow rate of the hydraulic oil 2 to be jetted by changing the cross-sectional shape of the control rod 3, the reaction force during the buffer stroke of the oil-filled shock absorber is kept substantially constant.

By the way, since the stroke of this oil-filled shock absorber is almost proportional to the square of the elevator speed, the stroke of the shock absorber also becomes large in a high-speed elevator, and the rated speed is 5%.
40 m / min. For elevators exceeding 2.
A stroke of 4 m or more is required, and the total height of the shock absorber is about 6 m. At such a high value, the operation of the shock absorber becomes unstable, and when the car or the counterweight strikes the shock absorber, an unbalanced load acting on the tip of the shock absorber causes a horizontal force to act on the shock absorber and the sliding part The frictional force is generated in the cylinder and the process is not performed smoothly, which may even cause the buckling of the shock absorber to break.

In order to solve such a problem, the actual publication of Kokaku Sho 52
As shown in FIGS. 4 and 5, the shock absorber disclosed in Japanese Patent Laid-Open No. 2199 discloses a shock absorber guide cylinder 11 for vertically guiding the shock absorber on a shock absorber receiving surface of a car 10 and a counterweight.
Is provided. As a result, when the car 10 collides with the top portion 5a of the plunger 5 of the shock absorber, the top portion 5a of the plunger 5 is fitted into the mouth portion of the shock absorber guide cylinder 11 as shown by the alternate long and short dash line in FIG. It is vertically guided along the inside of the frame as seen in FIG. Therefore, the shock absorber has no possibility of being subjected to an unbalanced load at its tip.

[0006]

As described above, FIG.
In the conventional oil-filled shock absorber shown in (1), when a car or a counterweight strikes, a horizontal force acts on the shock absorber due to an unbalanced load acting on the tip of the shock absorber, and the operation is unstable. Also, in the case of the shock absorber guide cylinder 11 shown in FIGS. 4 and 5, it is difficult to adjust the gap A between the guide cylinder 11 and the top 5a of the plunger. There is a risk of bumping.

The present invention has been made in order to solve the above-mentioned problems in the conventional oil-filled shock absorber, and the oil-filled shock absorber in which the stroke of the oil-filled shock absorber is smoothly performed and the safety thereof is remarkably enhanced. Is to provide.

[0008]

In order to achieve the above object, in the oil-filled shock absorber according to the present invention, horizontal members extending horizontally on both sides of the plunger are provided at the upper portion of the plunger, and both ends of the member are provided. The guide rails that are erected on both sides of the car are held between them, and a vertically movable guide shoe is attached.

[0009]

Since the guide shoe holds the guide rail, the horizontal movement of the guide shoe is restricted and only vertical movement is possible. Thus, when the car or counterweight strikes the shock absorber plunger, no horizontal displacement of the shock absorber plunger occurs even if the top of the shock absorber plunger is subjected to an unbalanced load.

[0010]

【Example】

Embodiment 1 FIG. 1 is a front view of an oil-filled shock absorber which is an embodiment of the present invention, FIG. 2 is a plan view of a horizontal member, in which 1, 5 and 9 are the same or corresponding parts as the conventional device, and 20 is A horizontal member, 21 is a guide shoe, and 22 is a car guide rail. As shown in the figure, the horizontal member 20 is attached to the upper portion of the plunger 5 of the shock absorber, and the guide shoes 21 are attached to both ends of the horizontal member 20. The guide shoe 21, as shown in FIG.
It is formed so as to sandwich the guide rails 22 provided upright at both ends, and is movable only in the vertical direction. Therefore, the top 5a of the plunger 5 cannot move in the horizontal direction, but can move only in the vertical direction. Therefore, when the car 10 descends and collides with the top portion 5a of the plunger, even if the plunger 5 receives an eccentric load, the plunger 5 is not displaced in the horizontal direction. Therefore, the stroke of the oil-filled shock absorber becomes smooth, and the safety of the shock absorber is significantly improved.

[0011]

According to the present invention, in an oil-filled shock absorber, a horizontal member is mounted on an upper portion of a plunger of the shock absorber, and a guide shoe that is vertically movable by sandwiching a guide rail of a car is mounted at a tip of the horizontal member. Therefore, even if a cage or a counterweight collides with the plunger of the shock absorber and the plunger receives an unbalanced load, the plunger is not horizontally displaced, and the safety of the shock absorber is greatly improved.

[Brief description of drawings]

FIG. 1 is a front view of an oil-filled shock absorber according to an embodiment of the present invention.

FIG. 2 is a plan view of a horizontal member.

FIG. 3 is a sectional view of a conventional oil-filled shock absorber.

FIG. 4 is a front view of a conventional oil-filled shock absorber in which a shock absorber guide tube is provided on a shock absorber receiving surface of a car.

FIG. 5 is an enlarged cross-sectional view of the shock absorber guide cylinder.

[Explanation of symbols]

 20 ... Horizontal member 21 ... Guide shoe 22 ... Car guide rail

Claims (1)

[Claims] 1. An oil-filled shock absorber provided in a lower pit of an elevator hoistway, comprising: a cylinder containing hydraulic oil; and a plunger having a built-in spring and inserted into the cylinder. A horizontal member extending orthogonally to the plunger and extending on both sides of the plunger is attached to the upper part of the plunger, and at both ends of the horizontal member,
An oil-filled shock absorber for an elevator, characterized in that guide rails, which are erected on both sides of a car, are mounted to hold vertically movable guide shoes.