JPS5811483A - Governor for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a speed governor that operates when the speed of an elevator car reaches an overspeed of a predetermined value or more.

Generally, a speed governor is installed in the machine room of an elevator to monitor the speed of the elevator as one of the safety devices.

Hereinafter, a conventional speed governor will be shown in FIGS. 1 and 2, or in the figures, parts directly related to the present invention will be shown in detail, and parts not directly related will be omitted.

Figure 1 shows the overall diagram of a conventional elevator governor, and Figure 2
The figure shows an explanatory diagram of the operation of the braking body that restrains the governor lobe. In the figure, 1 is the base of the speed governor 30, 2 is a jaw provided on the base 1, 3 is a sheave, and 4 is attached to an elevator car (not shown) on one side, and is wrapped around the sheave 3. A speed regulating rope 5 is rotatably attached to the sheave 3 at the support portion 5a.
A flyweight 6 is rotatably fixed to the shaft 3a of the sheave 3, and a ratchet having a toothed structure is normally mounted to maintain a stationary state; 7 is a shaft 3a of the sheave 3 as well. The arm is rotatably fixed to the ratchet 6 and integrally connected to the ratchet 6 by welding or the like, and is provided with a support portion 7a on the opposite side of the shaft 3a to engage with a pin of the head described later. Reference numeral 10 denotes a braking body composed of a gripper 11, a head 12, a spring 13, a rod 14, and pivots 15 and 16. The pivot 15 is rotatably supported by a bearing 19 fixed to the base 1 by a shaft 17 passing through the pivot 15, and the rod 14 is pivoted (15. The shaft 17 is slidably passed through the shaft 17, and a nut is attached to one end of the shaft 17 to prevent removal.

On the other hand, the other end of the rod 14 has a pivot 16 and a head 12.
are fixed, and a spring 1 is installed between the pivots 15 and 16.
3 is intervening. Next, a shaft 18 is attached to one end of the head 12.
A gripper 11 is rotatably attached to the head 1.
A pin 12a which normally engages with the support portion 7a of the arm 7 is provided approximately at the center of the arm 2. In this brake body 10, the rod 14 normally maintains a predetermined angle with respect to the horizontal line,
With the shaft 17 and shaft 18 separated by a predetermined distance, the arm 7
It is held by the support part 7a.

Next, the operation of this conventional device will be explained.

Assume that the elevator car is now operating in the downward direction and the lobe 4 is moving in the direction of arrow A.

When the speed of the elevator car reaches a predetermined speed exceeding the rated speed, the governor's safety circuit (not shown) is activated, opening the elevator control circuit, braking the hoisting machine, and stopping the elevator car. make it stop. However, if the elevator car speeds up further for some reason, sheave 3
further rotates, and the flyweight 5 rotatably supported by the sheave 3 also rotates around the shaft 3a in the same way as the sheave 3, so the flyweight 5 is caused by the centrifugal force as shown by the dashed line of the first tooth. It rotates clockwise around the shaft 5a as shown in FIG. When the speed of the elevator car reaches a predetermined value, the flyweight 5 kicks the pawl 6a of the ratchet 6 having a gear cutting structure.
The ratchet 6 rotates clockwise, and the arm 7 fixed to the ratchet O also rotates clockwise. the result,
The support portion 7a of the arm 7 holding the brake body 10 comes off the bottle 12a, and the brake body 10 begins to rotate clockwise around the shaft 17 due to its own weight. Next, when the rod 14 of the brake body 10 reaches a certain angle θ1 with respect to the horizontal line, as shown in FIG. Place it between your jaws 2. At this time, rod 1
4 slides inside the pivot 15 toward the left in the drawing, the spring 13 is compressed, and the lower edge of the pivot 16
The rod 14 is stopped in a horizontal position and the λ spring 1
The pressing force due to the deflection of the lobe 3 brakes the movement of the lobe 4 in the direction of the arrow A. This braking then generates a relative movement between the descending car and the braked lobe 4, which activates the emergency stop device provided on the car.
The basket stops.

However, in such conventional devices, the braking body is configured to be able to rotate freely in any rotational direction.
When the lobe vibrates violently while running, such as in a high-speed elevator, when the governor operates and the gripper comes into contact with the lobe, the vibration of the lobe can cause the gripper to be bounced back, resulting in jamming. There is a possibility that it will not work properly.

The present invention was made in view of the above points, and an object of the present invention is to provide a speed governor for an elevator in which the gripper is not bounced back due to the vibration of the lobe.

FIG. 3 is an explanatory diagram showing the structure and operation of a braking body of an elevator governor showing one embodiment of the present invention, FIG. 4 is a sectional view taken along the line 1-1 in FIG. 3, and FIG. 4 is an enlarged cross-sectional view taken along the line nn in FIG. 4, in which the same reference numerals as in FIGS. 1 and 2 indicate the same components. The apparatus of the present invention will be described below, but the series of operations of the speed governor are completely the same as the conventional ones, so the explanation will be omitted. In the figure, 100 is a reversal prevention device for the brake body 10, which is composed of a bearing 101, a shaft 102, a spring 103, a roller 104, and a roller support 105.
It is provided inside a bearing 101 that rotatably supports both ends of 02. As shown in FIG. 5, a shaft 102 constituting this reverse rotation prevention device 100 has a wedge-shaped notch 102a in a portion supported by a bearing 101, and a roller 104 is provided within this notch 102a. That is, this notch 102a is provided with a spring 103 whose one end is attached to the inner wall of the shaft 102, and the other end of this spring 103 is provided with a roller support 105.
A roller 104 is installed inside the roller 104 so as to be pressed against the inner wall of the shaft 102 and the bearing 101 via a roller support 105 due to the spring pressure of the spring 103 .

In FIG. 5, the shaft 102 configured in this manner is such that the roller 104 is rotated by the spring 10 when the shaft 102 is rotated clockwise.
The roller 104 can rotate freely while being pressed against the shaft 102 and the inner wall of the bearing 101 due to the spring pressure of No. 3, but for counterclockwise rotation, the roller 104 and the inner wall of the shaft 102 and the inner wall of the bearing 101 will rotate freely. The friction force generated in the roller 104
is wedged into the tip of the notch 102a of the shaft 102, so rotation is prevented.

The present invention provides such a reversal prevention device on the rotating shaft of the brake body, which prevents only the counterclockwise rotation of the brake body.
Even in a high-speed elevator where the elevator runs at high speed and the governor mode lobe vibrates violently, the gripper 11 will not be bounced back by the vibration of the lobe during the operation of the governor. The reversal prevention device according to the present invention is not an intermittent reversal prevention device like the commonly used reversal prevention device with a ratchet mechanism, but a continuous reversal function that functions regardless of the position of the notch in the rotating shaft of the brake body. Since it is a prevention device, the effect on the object of the present invention is even more significant.

In the above embodiments, the bearings at both ends of the rotating shaft of the braking body are provided with a reversal prevention device. There is no change in the effect of the invention.

[Brief explanation of the drawing]

FIG. 1 is an overall view of a conventional elevator speed governor. FIG. 2 is an explanatory diagram of the operation of the braking body that restrains the governor lobe in FIG. An explanatory diagram showing the structure and operation of the braking body of the speed gear, Figure 4 is the third
A sectional view taken along the line I-I in the figure, Figure 5 is the n-nfs of Figure 4.
It is an enlarged cross-sectional view in the direction of arrows. 381. Rope wheel 401. Rope 10, Braking body 11. ,,Governor 30,,,Governor
ioo,,, reverse rotation prevention device 17.102. ,,shaft
1p, iol, , bearing 103, , spring 104, , roller 105. ,, Roller support patent applicant Fujichik Co., Ltd. "-・' 4th B Aya 5 (2)

Claims (1)

[Claims] In a governor composed of a braking body equipped with a sheave and a gripper, and a lobe, a notch is provided in the rotating shaft of the braking body, and a roller is provided in the notch to rotate the rotating shaft. A speed governor for an elevator, characterized by having a reverse rotation prevention structure.