JPS6234675B2 - - 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 pressed by the rail 1 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 to make the rail 1 This increases the engagement with the 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,
As the frictional force becomes unstable, the wear and tear on the braking surface increases. Therefore, in order to obtain the required braking ability, the brake must be used within a range where significant melting does not occur between the brake 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 lowering 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 substrate made of a metal plate fitted into the recess 4a, and 5a is a plurality of protrusions provided on the side facing the rail 1 and spaced apart from each other. 6 is a core material 6a made of a heat-resistant fibrous material such as carbon fiber.
A sliding piece 7 is made of a ceramic material mixed with a material, and has an engaging part 6b formed of a recess fitted into the engaging part 5a on one side, and a groove 6c in a lattice shape on the other side. 8 is a threaded rod that is set upright on the board 5 and inserted into the through hole 4b, and 8 is screwed into this to form the recess 4.
This is the nut placed at c.

That is, the sliding piece 6 has an engaging portion 6b and an engaging portion 5a.
are fitted to each other and attached to the substrate 5, and the sliding piece 6 is fixed to the substrate 5 by brazing the portion facing the substrate 5. Then, the board 5 is fitted into the recess 4b of the brake piece 4 and attached to the brake piece 4 by the threaded rod 7 and nut 8. The sliding piece 6 is pressed against the rail 1 surface by the operation of the brake piece 4.
Since it is supported by the brake piece 5 by fitting and brazing, a stable braking force can be obtained. Furthermore, by fitting the engaging portions 6b and 5a together, the brazing area increases and the adhesion retention force is improved.Furthermore, even if a crack occurs in the sliding piece 6, it remains localized and the sliding piece 6 is attached to the substrate. The required braking action can be easily obtained with a small device that does not fall off. In addition, since the thin sliding piece 6 is held on the metal base plate 5, heat generated during braking is conducted from the base plate 5 to the brake piece 4, thereby suppressing the rise in temperature of the sliding surface of the sliding piece 6. Therefore, stable braking action can be obtained.
Further, even if the sliding surface of the sliding piece 6 is worn out, the braking action is obtained by the sliding piece 6 remaining between the engaging portions 5a of the base 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 stable and highly reliable braking action.

As explained above, in the present invention, a sliding piece made of a ceramic material is attached to a brake piece that is operated and pressed against a rail when necessary, via a substrate fitted to the sliding piece. 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 board, 5a is an engaging part, 6 is a sliding piece, and 6b is an engaging part.
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 press against the rail, the back side is installed in a recess in the surface of the brake piece facing the rail, and the front side A substrate is provided with an engaging portion consisting of a plurality of convex portions, and an engaging portion made of a ceramic material and has a recessed portion on the back side that engages with the engaging portion of the substrate. An emergency stop device for an elevator, comprising: a sliding piece fitted to the base plate through a sliding piece;