JPS6225499Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Description of Technical Field] The present invention relates to an oil-filled shock absorbing device for an elevator car.

[Description of prior art]

Figures 1 and 2 show elevator car frames. The elevator car frame 1 has an upper frame 2 and a lower frame 3 disposed vertically in parallel, both ends of which are connected by side frames 4, and a floor support frame 5 is fixed to the upper surface of the lower frame 3 so as to be perpendicular to the lower frame 3. In addition, braces 6 and 7 for maintaining the horizontality of the floor support frame 5 are connected to the side frames 4 and the floor support frame 5, respectively, and a buffer support plate 8 is fixed to the center of the lower frame 3.

An elevator car requires a safety device that reduces the impact and stops the car even if the car frame 1 collides with the bottom of the hoistway for some reason so that the people inside the car are safe.

The safety devices provided for this purpose are shock absorbers,
It's a battle.

Figure 3 shows a conventional oil-filled buffer. When the car frame 1, which consists of a plunger 10 with a cushioning rubber 9 provided at the upper end and a cylinder 11 that is filled with oil and slides on the plunger 10, collides with the buffer, the oil-filled buffer gradually collapses due to hydraulic resistance within the cylinder. The descent of the car frame 1 is suppressed and the car frame 1 is stopped smoothly.

In the car frame 1, a large load at the time of a buffer collision is received by the buffer receiving plate 8 fixed at the center of the lower frame 3, and a large bending moment acts on the lower frame 3.

Therefore, it is necessary to use a strong and heavy member for the lower frame 3 to withstand this, which is a factor that increases the weight of the car frame 1. Further, since a large bending moment is transmitted to the side frame 4 via the lower frame 3, a strong and heavy member that can withstand it is used.

In order to avoid receiving the load at the center of the lower frame 3 during a bumper collision, it is conceivable to arrange two buffers in parallel as shown in FIG. 4 so that the load is received near both ends of the lower frame 3. According to this method, the lower frame 3
The bending moment generated in the lower frame 3 and the side frames 4 can be made rigid. Moreover, since the car frame 1 after the buffer collision is supported by the two buffers, it is in a very stable state, which has very great advantages. In fact, this method is sometimes used in spring buffers.

However, it is practically impossible to keep the tips of the two buffers at exactly the same level, and the level difference h shown in Figure 3 occurs, and the lower frame 3 also descends while remaining horizontal. isn't it. Therefore, the car frame 1 does not collide with two buffers arranged in parallel at the same time, but one of them collides first.

At this time, a force tilted from the vertical direction is applied to the buffer, and there is a risk that the sliding portion between the plunger 10 and the cylinder 11 may be strained or the plunger 10 may buckle. For this reason, it is not recommended to arrange two oil-filled buffers in parallel. Furthermore, since two oil-filled buffers, which are much more expensive than spring buffers, are used, the cost increases significantly, and it is not actually done to arrange two oil-filled buffers in parallel.

[Purpose and outline of the idea]

In order to solve this problem, the present invention uses one buffer to achieve the same effect as using two buffers in parallel, and there is no risk of prying the sliding part of the plunger and cylinder or buckling the plunger. The objective is to obtain an inexpensive and reliable oil-filled buffer.

[Example of idea]

(1) Structure of the invention Figures 5 and 6 show an embodiment of the oil-filled buffer according to the invention. The cylinder 11 is the same as the conventional one.

The plunger 12 is the same cylinder 11 as before.
The arm 14 has a sliding part and a round hole near its upper end into which a pin 13 can be inserted, and two cushioning rubbers 15 and 15' are fixed to the upper surface of both ends. Both sides have round holes into which pins 13 can be inserted.

By arranging the arm 14 horizontally and connecting it to the plunger 12 with the pin 13, the arm 14 can be attached to the pin 1.
It is possible to rotate around 3.

(2) Effect of the invention When the car frame 1 collides with the buffer according to the present invention shown in FIG. 4, it does not collide with the cushioning rubbers 15 and 15' fixed to the upper surface of both ends of the arm 14 at the same time.
However, since the arm 14 is rotatable around the pin 13, even if the car frame 1 collides with either one of the cushioning rubbers 15, 15', the arm 14 will only rotate around the pin 13. However, it does not yet bear the load of a collision. Furthermore, when the car frame 1 descends slightly and collides with the cushioning rubbers 15 and 15' at the same time, the arm 14 stops rotating and begins to bear the load at the time of the collision.

At this time, only vertical force is applied to the plunger 12 from the arm 14 via the pin 13,
Since no bending moment or horizontal force is applied,
If the sliding part with the cylinder 11 becomes strained,
The plunger 12 will not buckle.

In addition, in the car frame 1, the load at the time of a buffer collision acts on the vicinity of both ends of the lower frame 3, and the bending moment acting on the lower frame 3 and the side frames 4 is greatly reduced. , it becomes possible to use light materials with low strength.

The car frame 1 at the time of collision will be supported by buffers near both ends of the lower frame 3, and will come to rest in a very stable state.

[Overall effect]

As described above, according to the present invention, by making a very inexpensive and easy improvement to one buffer, not only the advantages of arranging two buffers in parallel were realized, but also the disadvantages of that time were realized. It has become possible to eliminate prying of the sliding part between the plunger and cylinder and buckling of the plunger.

Additionally, since the bending moment acting on the lower frame of the car frame is greatly reduced, the weight of the car frame can be greatly reduced, which reduces the weight of the suspended weight, reduces the load on the hoisting machine, and reduces the load on the machine beam. It is possible to obtain significant secondary synergistic effects that extend to the entire elevator system, such as reducing the weight of a series of structures such as the machine head.

[Brief explanation of the drawing]

Fig. 1 is a front view of the elevator car frame, Fig. 2 is a side view thereof, Figs. 3 and 4 are front views of the conventional buffer and car frame, and Fig. 5 is a front view of the elevator car frame and the car frame of the present invention. FIG. 6 is a side view of the buffer of the present invention. 1... Car frame, 11... Cylinder, 12...
Plunger, 13...pin, 14...arm,
15, 15'...Buffer rubber.

Claims (1)

[Scope of utility model registration request] In an elevator that is installed at the bottom of an elevator hoistway and stops a falling elevator car by buffering it with an oil-filled cylinder/plunger mechanism, one arm with cushioning rubber attached to both ends is attached approximately to the tip of the plunger. A shock absorbing device for an elevator car characterized by being horizontally supported.