JP2907044B2 - Elevator safety gear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency stop device for an elevator, and more particularly to an improvement in a brake piece pressed against a guide rail when the emergency stop device is operated.

[0002]

2. Description of the Related Art An example of a conventional elevator safety device will be described with reference to the drawings. 2 is a side view of a main part of the safety device, FIG. 3 (a) is a front view of a braking piece, and FIG. 3 (b) is a central longitudinal sectional view of the braking piece. In the figure, reference numeral 1 denotes an elevator car which moves up and down while being guided by the guide rails 2 erected on the hoistway of the elevator, 3 safety device installed at the bottom of the car 1, the recess 4a on the guide rail 2 side 4 Is a sliding piece made of a sintered alloy sintered on a steel metal base 6, and 7 is a screw for fixing the metal base 6 to the recess 4a of the braking piece 4.

[0003] Due to the occurrence of an abnormality or the like, the descending speed of the car 1 exceeds a predetermined value, and a governor (not shown) is operated, so that the braking piece 4
Is pulled up, the braking piece 4 is pressed against the guide rail 2 by the wedge action, and the car 1 is braked by the frictional force between the sliding piece 5 and the guide rail 2.

[0004] However, in the case of an elevator that requires a large braking force, such as an ultra-high-speed elevator or an elevator having a large car weight, a large amount of frictional heat is generated in the sliding piece 5. If the frictional heat causes the sliding piece 5 to be melted, the frictional force becomes unstable, and the sliding surface becomes severely worn, which may make it impossible to perform required braking. Therefore, the sliding piece 5 had to be used within a range where melting did not occur.

Therefore, it is considered to use a ceramic having a high melting point as the sliding piece, but there is a problem that the ceramic lacks toughness and may be broken by a thermal shock. In view of this, there has been proposed a method in which ceramic is divided into small pieces and used. FIG. 4A is a front view of the braking piece, and FIG. 4B is a central longitudinal sectional view of the braking piece. In the drawing, reference numeral 8a denotes a plurality of fitting portions provided on the guide rail 2 side of the braking piece 8, and 9 denotes a sliding piece made of ceramic fitted to the fitting portion 8a.

According to this structure, a large braking force can be obtained because ceramic is used, and the possibility of cracking is small because the ceramic is a small piece.

[0007]

However, even when ceramic is used, there is still a possibility that the sliding piece 9 may be filled with heat during operation of the safety device and cracks may occur.
In addition, since the sliding piece 9 is only configured to fit into the fitting portion 8a, there is a problem that if the ceramic is cracked, it is easily dropped. Furthermore, when the safety device operates and the sliding piece 9 is worn, there is a problem that the entire braking piece 8 must be replaced.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a sliding piece is formed into a small piece, the shape thereof is formed into a downwardly swelling shape such as a truncated cone or a truncated pyramid, and the base portion is formed by casting. It is formed integrally with a metal base having higher thermal conductivity, and this metal base is detachably fixed to the braking piece.

[0009]

According to the present invention, the frictional heat generated by the sliding piece is quickly dissipated through the metal base having a high thermal conductivity. Therefore, heat is less likely to be trapped in the sliding pieces, and cracking due to melting or thermal shock of the sliding pieces can be suppressed. Further, since the sliding piece has a downward swelling shape, even if a crack occurs, there is almost no possibility that the sliding piece is missing. Further, even when the sliding piece is worn by the operation of the safety device, it is not necessary to replace the braking piece, and only the metal stand needs to be replaced, so that maintenance is easy. In addition, since it is compatible with the conventional brake pieces, standardization of parts can be performed.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG.
FIG. 1A is a front view of a braking piece, and FIG. 1B is a central longitudinal sectional view of the braking piece. In the drawing, reference numeral 10 denotes a truncated pyramid-shaped sliding piece made of ceramic, 11 denotes a metal base made of a metal having a higher thermal conductivity than ceramic, such as cast iron, steel, or copper, and is integrated with the base of the sliding piece 10. It is cast-molded. The same reference numerals as those in FIG. 3 indicate the same components.

In this embodiment, since the contact area between the sliding piece 10 and the metal base 11 is large and the thermal conductivity of the metal base 11 is high, the frictional heat generated in the sliding piece 10 is quickly reduced to the metal base 11.
The sliding piece 10 is diverged and the temperature rise of the sliding piece 10 is suppressed, a stable braking effect is obtained, and cracks are hardly generated. Further, since the sliding piece 10 has a truncated pyramid shape, even if a crack occurs, there is almost no possibility that the sliding piece 10 will be missing. Further, the operation of the emergency stop device causes the sliding piece 10 to move.
Even if the brakes are worn, it is not necessary to replace the entire braking piece 4 and only the metal table 11 needs to be replaced, so that maintenance is easy, and since it is compatible with the conventional braking piece 4, standardization of parts is possible. Can be realized.

As described above, according to the present embodiment, the problem of the conventional braking piece is solved, and the operation with high reliability can be achieved even when applied to an ultra-high-speed elevator or an elevator having a large car weight. It can be carried out.

In the above embodiment, the sliding piece 10 has a truncated pyramid shape, but may have another truncated cone shape such as a truncated cone shape. What is necessary is just a shape larger than a cross-sectional area.

Further, the sliding piece 10 is made of a material other than ceramic,
A carbon-ceramic composite may be used. This carbon-
The ceramic composite material is a graphite matrix in which ceramic particles are grown and dispersed in a graphite matrix, and has excellent heat resistance, thermal shock resistance, and high strength.

Further, as the sliding piece 10, a sintered alloy can be used. In the case of the sintered alloy, the heat resistance is not as high as that of the ceramic, but if the contact area with the metal base 11 having high thermal conductivity is increased as in the above embodiment, the frictional heat is quickly applied to the metal base 11. Since the heat is transmitted and the temperature rise of the sliding piece 10 is suppressed, it can be sufficiently used even in an ultra-high-speed elevator or the like. Further, the present invention can be similarly applied to not only elevator cars but also other lifting bodies such as counterweights.

[0016]

As described above, according to the present invention,
A highly reliable emergency stop device for an elevator can be obtained, in which the sliding piece is securely held, has excellent heat resistance, is easy to maintain, and has component interchangeability.

[Brief description of the drawings]

FIG. 1 is a diagram showing one embodiment of the present invention.

FIG. 2 is a side view of a main part of an emergency stop device of the elevator.

FIG. 3 is a view showing a conventional braking piece.

FIG. 4 is a view showing a conventional braking piece.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevator car 2 Guide rail 3 Emergency stop device 4,8 Braking piece 5,9,10 Sliding piece 6,11 Metal stand

Claims (2)

(57) [Claims] 1. A provided lifting member to be guided by the guide rails, it is pressed against the guide rail running when needed
An emergency stop device for an elevator having a braking piece that moves in a direction, a plurality of sliding pieces having a downward bulging shape, and a base portion side of each sliding piece such that each of the sliding pieces faces the guide rail. An emergency stop device for an elevator, comprising: a metal base made of a metal having a higher thermal conductivity than the sliding piece, and means for detachably fixing the metal base to the braking piece. 2. An elevating body guided by a guide rail.
Is operated when necessary and pressed by the guide rail.
Safety device for elevators with braking piece moving in opposite directions
, A plurality of sliding pieces and each of these sliding pieces
Sliding pieces with one side of each sliding piece embedded so as to face each other
A metal base made of metal with higher thermal conductivity than this metal
Means for detachably fixing the base to the braking piece.
Cross section of one side of the sliding piece and the other side not embedded
The feature is that it is different and does not fall off easily
Emergency stop device for an elevator to be.