JPS6031751B2 - Governor for elevators - Google Patents

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 control device that monitors the speed of the elevator is installed as one of the safety devices in the machine room of the elevator.

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

Figure 1 shows the overall view of the conventional Elevator style toyoiso.
The figure shows an explanatory diagram of the operation of the braking body that restrains the speed governor rope.

In the figure, 1 is the main body of the speed governor, 2 is the jaw provided on the main body 1, 3 is a sheave, and 4 is an elevator car on one side (not shown)
5 is a flyweight that is rotatably supported on the sheave 3 at the support portion 5a, and 6 is a lobe that rotates around the shaft 3a of the sheave 3. A ratchet 7, which has a gear cutting structure and is fixed to a shaft so as to be freely movable and normally maintained in a stationary state, is also rotatably fixed to the shaft 3a of the sheave 3, and is integrated with the ratchet 6 by welding or the like. A support portion 7a is provided on the opposite side of the shaft 3a to engage with a pin of a head, which will be described later. Reference numeral 10 denotes a brake body composed of a gripper 11, a head 12, a spring 13, a rod 14, a pivot 15, and a spring seat 16.

The pivot 15 is rotatably fixed to a shaft 17 provided in a bearing 19 fixed to the main body 1, and one end of a rod 14 passing through the shaft 17 is attached to the pivot 15 with a nut. 15 and shaft 17 so as to be slidable therein. On the other hand, rod 1
A spring seat 16 and a head 12 are fixed to the other end of the spring 4, and a spring 13 is interposed between the pivot 15 and the spring seat 16. Next, a gripper 11 is rotatably attached to one end of the head 12 by a shaft 18, and a pin 12a that normally engages with the support portion 7a of the arm 7 is provided approximately in the center of the head 12. Note that in this brake body 10, the rod 14 normally maintains a predetermined angle with respect to the horizontal line, and the shaft 17
and shaft 18 are held by the support portion 7a of the arm 7 with a predetermined distance between them. Next, the operation of this follower device will be explained.

Assume that the elevator car is now being driven 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) opens the elevator control circuit, brakes the hoisting rock, and stops the elevator. Stop the car. However, if the elevator car speeds up further for some reason, the sheave 3 rotates further, and the flyweight 5 rotatably supported by the sheave 3 also rotates.
The fly weight 5 rotates around the axis 3a in the same way as the
is rotated clockwise about the shaft 5a as shown by the dashed line in FIG. 1 due to a zero force. When the speed of the elevator car reaches a predetermined position, the flyweight 5 kicks the pawl 6a of the ratchet 6 having a gear cutting structure, so the ratchet 6 rotates clockwise, and the arm 7 fixed to the ratchet 6 rotates clockwise.
also rotates clockwise. As a result, the support portion 7a of the arm 7 holding the brake body 10 is released from the pin 12a, so that the brake body 10 rotates clockwise around the shaft 17 due to its own weight. Next, when the rod 14 of the brake body 10 reaches a certain angle of 0 with respect to the horizontal line, the gripper 11 contacts the rope 4 and is pressed further downward by its frictional force, and the rope 4 is pinched between the jaws 2. It's crowded. At this time, the spring 13 is compressed, the lower green part of the spring seat 16 is supported by the main body 1, the rod 14 is stopped in a horizontal position, and the pressing force due to the deflection of the spring 13 is applied to the arrow EOA of the rope 4.
Brake movement in the direction. This braking then generates a relative movement between the descending car and the braked rope 4, which activates the emergency stop device provided on the car, so that the car stops. With such conventional equipment,
The gripping action of the rope 4 between the gripper 11 and the jaws 2 is performed only by the frictional force between the gripper 11 and the lobe 4, so if the initial frictional force when the gripper 11 and the rope 4 come into contact is not sufficient, /This pinching action cannot be performed reliably.

This becomes a problem as the angle 0 of the rod 14 with respect to the horizontal line when the gripper 11 contacts the rope 4 increases. In other words, this pinching action is the second
As shown in the figure, the angle 0. If is large, the push-up force F with the same return force F,
As the pressure increases, the pressing force F2 decreases and the frictional force F3 decreases, making the pinching action difficult. Furthermore, when the elevator moves at high speed, the rope 4 vibrates while running, so when the gripper 11 comes into contact with the rope 4, the rope 4 rebounds the gripper 11, causing a pinching action. It's not going well. The present invention has been made in view of the above points, and an object of the present invention is to provide a highly reliable speed governor that always has a good pinching action.

The gist of this invention is that when the elevator car reaches overspeed, the brake body begins to rotate around its axis, and the point at which the retainer provided at the tip of the brake body touches the rope for the first time is delayed compared to conventional methods. It is in.

In other words, in this invention, the gripper touches the rope only when the braking body is in a nearly horizontal state. By configuring the speed governor to restrain the rope, the pushing force exerted by the pressing spring when the gripper touches the rope for the first time is suppressed to almost zero, thereby ensuring the clamping action. 3rd below
An embodiment of the present invention will be described with reference to the drawings and FIG.

In the figure, 10 rivers, holder 11, head 12, and spring 13
and rod 114, pivot 115, spring seat 16 and pin 1
21 and a hook 122, the rod 114 is a hollow pivot 1 with a pin 121.
15 and has a notch structure at one end.
2 is attached, a head 12 is attached to the other end, and a spring seat 16 is fixed to the middle part. The rod 114 is structured to be able to move within the pivot 115 and pin 121. A spring 13 is inserted between the pivot 115 and the spring seat 16, and a pin 121 fixed to the pivot 115 is movable along a guide 120 directly attached to the main body. Next hook 122
is usually engaged with a shaft 117 mounted on a bearing 19,
When the rod 114 falls to a substantially horizontal position, it is separated from the shaft 117 by the spring pressure of the spring 13 as shown in FIG. 3b. Note that the same reference numerals as in FIGS. 1 and 2 indicate the same components. Next, the operation of the device of the present invention will be explained.

As with the conventional device, the safety circuit does not work and the speed of the elevator car reaches a predetermined value, and the support portion 7a of the arm 7 moves to the pin 12.
When the brake body 100 is separated from the position a, the brake body 100 is rotated by the shaft 117 due to its own weight.
However, the gripper 11 does not immediately contact the rope 4. After that, 100 more braking bodies
rotates and the braking body 100 becomes approximately horizontal, the notch 122a of the head 112 separates from the shaft 117 and the spring 1
3, the rod 114 is guided by the pivot 115 and pin 121 and moves in the direction B in the figure, and the gripper 11 comes into contact with the rope 4 for the first time. At this time, since the brake body 100' is in a substantially horizontal state, there is almost no upward force F due to the return force of the spring 13, and the pinching action is completed. Next, the brake body 100 continues to rotate further clockwise around the pin 121 until it becomes completely horizontal, and the gripper 11 completely brakes the rope 4 to stop the elevator car.

The trajectory of the gripper 11 in this case is shown in FIG. 4a. Fourth
FIG. b shows the trajectory of the conventional gripper 11. In this manner, when the brake body 100 is operated, the center of rotation of the brake body loo is moved from the shaft 117 to the pin 121, and initially
When the distance from , the hook 122 comes off the shaft 117 and the spring 13
By structuring the gripper 11 to come into contact with the rope 4 due to the action of This makes it less susceptible to the effects of

In addition, when restoring the brake body 100 that has once worked, push the head 12 of the brake body 100 horizontally in the direction of the pin 121 until the hook 122 is hooked on the shaft 117, and then lift the head 12. The hook 122 is hooked on the shaft 117, rotated around the shaft 117, and the pin 1
2a can be hooked and set on the support part 7a. As described above, the present invention changes the center of rotation of the braking body during initial operation and the center of rotation of the braking body when braking the rope, so that when the braking body is in a substantially horizontal state, the gripper and the lobe are Since the gripper makes contact with the rope, it absorbs the repulsion caused by the tension of the lobe when the gripper comes into contact with the rope, and also suppresses the uplifting force to a low level. The influence of fluctuations in frictional force can be suppressed as much as possible.

[Brief explanation of drawings]

Fig. 1 is an overall view of a subordinate elevator control machine, Fig. 2 is an explanatory diagram of the operation of a braking body of a conventional elevator control machine, and Fig. 3 is an elevator control machine showing an embodiment of the present invention. A detailed view of the braking body, FIG. 4a is a diagram showing the trajectory of the gripper of the present invention, and FIG. 4b is a diagram showing the trajectory of the gripper of the slave. 10,100...Brake body, 3...Governor rope, 17,117...Shaft, 122...Hook, 1
20...Guide, 121...Pin, 14,114"""
Rod. Figure 2 Sei Figure 4 Demon Figure 4 Figure 11 Kanbatsu Rozu Taro/Seal

Claims (1)

[Claims] 1. A braking body consisting of a rod having a gripper at one end facing the rope, a pivot, a spring seat, and a spring between them at the middle part, and a hook with a notch structure at the other end, Normally, the braking body is supported at a predetermined angle with respect to the horizontal line, and when the car exceeds a certain speed, the braking body is released from being supported at a predetermined angle and the braking is applied. In the apparatus in which the body is rotated, the gripper is brought into contact with the rope, and the rope is sandwiched between the gripper and the main body by the spring pressure of the spring, until the braking body reaches a substantially horizontal state. The hook is pivoted to the main body, and when the brake body reaches a substantially horizontal state, the brake body is moved toward the rope by the spring pressure of the spring, so that the gripper presses the rope against the body. A speed governor for an elevator, characterized in that the governor is configured to be able to deviate freely, and the pivot is configured to be always guided by the main body.