JPS6234674B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an emergency stop device for an elevator.

First, an elevator emergency stop device will be explained with reference to FIG.

In the figure, 1 is an elevator hoistway (not shown)
A vertically installed rail, 2 is an elevating body consisting of a car that is guided up and down by the rail, 3 is an emergency stop device installed on the elevating body 2, and 4 is a brake piece of the emergency stop device 3, which is normally attached to the rail. Although a detailed explanation will be omitted, when the descending speed of the elevating body 2 exceeds a predetermined value, it rises relative to the elevating body 2 and protects the slope of the fixed part of the emergency stop device 3 and the rollers. It is pressed against one side of the rail through the rail.

In other words, the brake piece 4 operates at the required time to stop the rail 1.
The lifting body 2 is braked by the friction between the brake piece 4 and the rail 1 surface. The braking ability at this time is determined by the product of the friction coefficient between the brake piece 4 and the rail 1 surface and the pressing force of the brake piece 4. Therefore, in order to obtain a compact emergency stop device 3 with high performance, it is necessary to increase the coefficient of friction and the pressing force. In order to increase the pressing force, the brake piece 4 must be made of a material that can withstand high pressure per unit area.On the other hand, in order to increase the coefficient of friction, a large number of protrusions are provided on the braking surface of the brake piece 4 so that the rail This increases the engagement with one surface. However, by providing the protrusions on the brake piece 4, the effective contact area with the rail 1 surface is reduced.
This situation also requires a brake piece 4 with high pressure resistance. The pressure resistance of the brake piece 4 is determined by the melting limit of the brake surface when the rail 1 is pressed, and when melting occurs,
Frictional force becomes unstable and wear and tear on the braking surface increases. Therefore, in order to obtain the required braking ability, the braking piece 4 must be used within a range where significant melting does not occur between the braking piece 4 and the rail surface. On the other hand, brake piece 4
When the rail 1 is pressed, the braking surface of the rail 1 is moved by the descent of the elevating body 2, so that less frictional heat is accumulated and melting is less likely to occur. Therefore, by increasing the heat resistance of the brake piece 4, it is possible to prevent the braking surface from melting and obtain a braking action with a high surface pressure. Therefore, in order to achieve braking action under high surface pressure, it is conceivable to construct the braking surface of the braking piece 4 with a ceramic material, but the ceramic material lacks toughness and has the disadvantage of causing breakage.

The present invention solves the above-mentioned drawbacks, and aims to provide an elevator emergency stop device that is compact and has a high-capacity braking action without causing problems such as melting of the braking surface.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

In the figure, the same symbols as in Figure 1 indicate the same parts, 4a
is a recess provided on the surface of the brake piece 4 facing the rail 1, 4b is a through hole provided in the recess 4a, and 4c is a through hole provided on the opposite side of the brake piece 4 to the recess 4b.
5 is a holding plate made of a steel plate arranged to form a space between it and the recess 4a; The through hole 6 is a sliding piece made of ceramic material mixed with a core material 6a made of a heat-resistant fibrous material such as carbon fiber, and fitted into the recess 4a, and 6b is a sliding piece on one side of this. A protrusion that is provided and fitted into the through hole 5a and protrudes toward the rail 1 side, 7 is a threaded rod that is set upright on the holding plate 5 and inserted into the through hole 4b, and 8 is screwed into this to form the recess 4c. It is Natsu placed in.

That is, the sliding piece 6 is fitted into the recess 4a,
Further, the protrusion 6b is fitted into the through hole 5a of the holding piece 5, and the holding piece 5 is connected to the brake piece 4 by the threaded rod 7 and nut 8.
It is held by the brake piece 4 by being attached to the brake piece 4. Then, due to the operation of the brake piece 4, the end face of the protrusion 6b of the sliding piece 6 is pressed against the rail 1 surface, but at this time, the sliding piece 6 fits into the recess 4a, and the protrusion 6b and the through hole. 5a and is held on the brake piece 4 by the holding piece 5, the sliding piece 6 is held by friction.
The load acting on the brake member 4 is reliably transmitted to the brake piece 4, resulting in a stable braking action. In addition, since the protrusions 6b are fitted to the retaining plate 5, even if a crack occurs in the sliding piece 6, it remains localized and the sliding piece 6 does not fall off from the retaining plate 5. can be easily obtained with high reliability using a small device. In addition, the sliding piece 6 is made of a metal holding plate 5.
Since it is held through the brake plate 5, the heat generated during braking is conducted from the holding plate 5 to the brake piece 4, and the temperature rise of the sliding piece 6 is suppressed, resulting in a stable braking operation.
Further, even if the protrusion 6b of the sliding piece 6 is worn out, the braking effect is still provided by the retaining plate 5, so that the braking ability is not immediately lost. In this embodiment, since the core material 6a is mixed into the sliding piece 6, the toughness of the ceramic material increases, making it difficult to cause breakage and providing a highly reliable braking action.

As explained above, the present invention uses a sliding piece made of ceramic material and having protrusions protruding from the through hole of the holding plate, on the braking piece that operates when necessary and is pressed against the rail. It is attached to the brake piece in a clamped state. As a result, the sliding piece is securely held by the brake piece, preventing the sliding piece from coming off, and the elevator is small and has high braking capacity, allowing for stable and highly reliable braking action. This system realizes an emergency stop device.

[Brief explanation of the drawing]

FIG. 1 is a conceptual side view of essential parts of an elevator system showing an elevator emergency stop device, FIG. 2 is an enlarged view of a portion of FIG. 1 showing an embodiment of an elevator emergency stop device according to the present invention, and FIG. FIG. 2 is a left side view of the brake piece, and FIG. 4 is a sectional view taken along the line of FIG. 3. 1 is a rail, 2 is an elevating body, 4 is a brake piece, 5 is a holding plate, 5a is a through hole, 6 is a sliding piece, 6b is a protrusion,
In addition, the same parts or corresponding parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1.In a device having a brake piece that is installed on an elevating body guided by a rail and operated when necessary to be pressed against the rail, a large number of through holes are provided and the brake piece is attached to the surface facing the rail. The retaining plate is made of a ceramic material, and protrusions corresponding to the through holes are provided on the braking surface side, and these protrusions protrude from the through holes and are arranged between the brake piece and the retaining plate. An emergency stop device for an elevator, comprising a sliding piece attached to the brake piece via a holding plate.