JPH0720825B2 - Governor for elevator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a speed governor that detects an overspeed of an elevator based on displacement of flyweights caused by centrifugal force.

[Prior Art] FIG. 3 is a partial cross-sectional side view showing a conventional elevator governor disclosed in, for example, Japanese Utility Model Laid-Open No. 64-9971.

In the figure, (1) is a frame, (2) is a shaft whose one end is fixed to the frame (1) and is arranged in the horizontal direction, (3) is a sheave rotatably supported by the shaft (2), (4) is a speed governor rope which is formed in an endless shape and is wound around the sheave (3), and one side of which is connected to an elevator car (not shown).
(5) is a flyweight pivotally supported by the sheave (3),
Reference numeral (6) is an operating rod which is interlocked with the flyweight (5), and a guide roller (7) is attached to the tip thereof. (8)
Is a guide tube that is fitted into the shaft (2) so as to be movable in the axial direction and engages with the guide roller (7) at the circumferential portion. An actuation rod pivotally supported by the frame body (1), and (10) is an overspeed detection switch provided on the frame body (1) and actuated by the lower end of the actuation rod (9).

A conventional elevator governor is configured as described above,
When the car goes up and down, the governor rope (4) also moves, and the sheave (3) rotates. Along with this fly weight (5)
, But the actuating rod (9) does not actuate the detection switch (10).

When the speed of the car increases while the car is running, the flight weight (5) is gradually displaced outward, and the guide tube (8) moves in the arrow direction via the operating rod (6) and the guide roller (7) to operate. The rod (9) also rotates. When the traveling speed of the car exceeds a predetermined speed, the actuation rod (9) actuates the detection switch (10) and a stop signal is issued to stop the car.

[Problems to be Solved by the Invention] In the conventional elevator governor as described above, the guide tube (8) fitted in the shaft (2) is configured to be moved by the operation rod (6). Therefore, a gap is required between the guide roller (7) and the guide cylinder (8), and as a result, there is a problem in that the speed detection accuracy decreases.

The present invention has been made to solve the above problems, and an object thereof is to provide an elevator speed governor capable of improving speed detection accuracy.

[Means for Solving the Problem] In an elevator governor according to the present invention, a disc is fitted onto a shaft of a sheave so as to be movable in the axial direction, and a circumferential portion of the disc is pivoted on the sheave. The fly weight is engaged with the attached fly weight, and the fly weight is pressed against the disc by a spring.

[Operation] In the present invention, since the circumferential portion of the disc fitted into the shaft of the sheave is engaged with the flyweight, when the flyweight is displaced by centrifugal force, the disc moves in the axial direction and is detected. Activate the switch. At this time, since the flyweight is pressed against the disc by the spring, there is no gap between the engaging portion of the flyweight and the circumferential portion of the disc.

[Embodiment] FIGS. 1 and 2 are views showing an embodiment of the present invention, FIG. 1 is a partial sectional side view, and FIG. 2 is a sectional view taken along line II-II of FIG. The same parts as those of the conventional device are indicated by the same reference numerals.

In the figure, (5) is a fly weight, which is pivotally supported by a sheave (3) by a pin (15) and a roller (16) is attached to a rear end thereof. (17) is an inner disc fitted to the shaft (2) so as to be movable in the axial direction, and (18) is an outer disc fitted to the outer circumference of the inner disc (17) via a bearing (19). Then, the inclined surface (18a) is formed at two locations on the outer periphery thereof, and the roller (16) is in contact therewith. (20) is a torsion spring that is provided on the flyweight (5) and biases the flyweight (5) in a direction of pressing the roller (16) against the inclined surface (18a), and (21) is an inner disc (17).
An actuator that is fixed to and operates the detection switch (10),
Reference numeral (22) is a balance spring which is a pushing spring which is inserted into the shaft (2) and biases the inner disc (17) to the right in FIG.

In the elevator governor configured as described above, when the sheave (3) normally rotates, the flyweight (5) also rotates and is displaced outward by centrifugal force, and the roller (16) is rotated.
Presses the inclined surface (18a) of the outer disk (18). with this,
The outer disc (18) and the inner disc (17) move to the left in FIG. 1, but because they are receiving a force to the right due to the balance spring (22), they are placed in a balanced position. The disc (17) stops and the outer disc (18) rotates around the inner disc (17). However, at this time, the actuating body (21) does not actuate the detection switch (10).

When the traveling speed of the car increases, the inner disk (17) moves further to the left against the force of the balance spring (22), and when the traveling speed of the car exceeds a predetermined speed, the actuating body (21) moves. The detection switch (10) is actuated, and a stop signal is issued to stop the car. The movement of the roller (16) in the vertical direction is small, but the amount of movement of the outer disk (18) in the left-right direction is large because it is enlarged by the inclined surface (18a) and transmitted to the outer disk (18). Become. Further, since the roller (16) is constantly pressed against the inclined surface (18a) by the force of the torsion spring (20), there is no gap between them and the movement of the inner disc (17) is directly detected. Therefore, the detection accuracy is improved.

[Effects of the Invention] As described above, according to the present invention, a disk is fitted into a shaft of a sheave so as to be movable in the axial direction, a circumferential portion of the disk is engaged with a flyweight, and a flyweight is provided. Since it is pressed against the circumference of the disc with a spring, there is no gap between the engaging part of the flyweight and the circumference of the disc, and the movement of the disc is directly detected, improving the speed detection accuracy. There is an effect that can be made.

[Brief description of drawings]

FIG. 1 is a partial sectional side view showing an embodiment of an elevator adjusting speed governor according to the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a conventional elevator speed governor. It is a partial cross-sectional side view showing. In the figure, (2) is a shaft, (3) is a sheave, (4) is a governor rope, (5) is a flyweight, (10) is a speed detection switch, (17) is an inner disk, and (18) ) Is an outer disk and (20) is a torsion spring. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A rope weight is pivotally attached to a sheave around which a governor rope is wound, and a switch for detecting an overspeed of a car is actuated by displacement of the flyweight due to centrifugal force. A disc that is fitted to the shaft of the vehicle so as to be movable in the axial direction, engages with the flyweight at a circumferential portion, and is pressed in the axial direction by the displacement of the flyweight to operate the detection switch; A speed governor for an elevator, comprising: a flyweight provided with a spring for pressing the flyweight in the engaging direction.