JPH0520338Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The invention of the present application is used to prevent workers from falling at high places.

(Prior art) A similar type of conventional technology involves winding a wire rope around a spring-loaded drum, and is equipped with a centrifugal clutch mechanism, which connects the worker's waist and allows the rope to be pulled out quickly due to a fall. When the rope was let out, a centrifugal claw was activated to stop the rope from being let out and prevent a fall. In addition, some models have been found that are used in conjunction with a centrifugal clutch mechanism to allow the brake pads to slide into contact within the frame to alleviate the impact of falling.

(Problems that the invention aims to solve) However, with only a centrifugal clutch mechanism, the impact when stopping a fall is quite high, and with the method of sliding the brake pad, there is always that sliding contact, so there is a large resistance when pulling out the rope. In addition, reducing the resistance has a negative effect on the shock-absorbing effect, and its preparation is delicate and not a practical method.

(Means for Solving the Problems) Therefore, in the present invention, the brake pad is pressed and moved toward the contact plate at the same time as the centrifugal clutch mechanism is activated, thereby alleviating the impact force when preventing the brake pad from falling. This makes it possible to distinguish old equipment from new equipment, and provides a fall prevention function that prevents internal damage to workers.

(Example and operation) A main shaft 2 is fixed at the center of a two-part frame 6 formed by molding, etc., the main shaft 2 has a groove for winding a rope around it, and a winding spring 3 is attached to one side. A winding drum 1 is provided rotatably via a bearing 12, and on the other side of the spring box 11 there are two lock claws 41 biased with a release spring 42 on a diagonal line with the main shaft 2 in between. establish. Lock claw 41
Threads are provided for a predetermined distance on the main shaft 2 corresponding to the position, and a lock plate 5 is screwed onto the threads in a manner that tightens in the opposite direction to the winding drum 1 direction. Serrated teeth are formed on the peripheral edge of the lock plate 5 so as to engage with the lock pawl 41, and a take pad 51 is fixed to the side opposite to the winding drum 1 side. A brake plate 21 is fixed on the main shaft 2 at a position facing the disc pad 51, and the disc pad 51 is sandwiched between the brake plate 21 and the lock plate 5, and they are connected by a screw 52 having a breaking load of about 200 to 400 kg. do. Further, an indicator pin 53 is inserted from the direction of the brake plate 21 so that its tip abuts on the lock plate 5, and the other end is housed in a hole provided in the frame 6, so that the end can be visually observed from outside the frame 6.

A wire rope with one end fixed is wound in the groove of the winding drum 1 and taken out of the frame 6, and a hook or other fastening means is provided at the tip.

The present invention with the above configuration is attached above the worker's head, and the wire rope is pulled and the hook at the end of the ring of the safety belt worn around the waist is hung during the work, but in the unlikely event that the worker loses his footing and falls. When the wire rope is pulled rapidly, the take-up drum rotates rapidly, and the lock pawl 41 provided on its side rotates in the direction of engagement with the saw teeth of the lock plate 5 due to centrifugal force. The lock plate 5, which has a threaded relationship with the main shaft 2 that moves to the main shaft 2, rotates and cuts the screw 52, and the disk pad 51 provided on its side comes into sliding contact with the brake plate 21, and the winding drum 1 It acts to stop the rotation of the machine, and once a fall occurs,
The lock plate 5 moves on the main shaft 2 toward the brake plate 21 and the two come into contact, making reuse impossible. Therefore, a half-fixed indicator pin 53 is inserted into the hole provided in the brake plate 21 from the frame 6 side, and its tip is configured to abut against the lock plate 5, so that when a fall occurs, both plates 5, 21 display pin 5 due to contact with
3 is pushed and the opposite end protrudes from the hole in the frame 6, thereby confirming the occurrence of a fall and preventing reuse in that state. When reusing, move the lock plate 5 to the winding drum 1 side on the shaft 2, connect the lock plate 5 and brake plate 21 with screws 52, and connect the indicator pin 53 inserted through the brake plate 21 with the lock plate 5. This restores the contact state. In addition, as another embodiment of the display pin 53, the other end of the display pin 53 whose tip is in contact with the lock plate 5 does not come out of the frame 6, but remains in the same plane position as the brake plate 21, A configuration in which the protrusion from 21 is performed through a confirmation window provided on the frame 6 has the same effect, and since no hole is provided in the frame 6, there is no intrusion of rain leakage.
This is an advantageous configuration.

(Effect of the invention) As described above, in the present invention, the disk pad 51 moves in the direction of increasing the braking force due to the impact force at the time of a fall, and the braking force is gradually strengthened, so that smooth impact cushioning can be obtained. This reduces the amount of shock given to workers.

Furthermore, it can be confirmed by the display pin 53 protruding from the frame 6 that the buffering effect has been performed once, and there is no possibility of accidentally reusing it at the next work opportunity. Moreover, this operation can be performed again by removing the frame 6, returning the position of the lock plate 5, replacing the screw 52, and pushing in the display pin 53, which also has an economical effect.

In addition, by changing the strength setting of the screw 52 within the range of 200 to 400 kg, the initial load at the time of buffering can be set as desired.

[Brief explanation of drawings]

Figure 1 is a partially cutaway front view, Figure 2 is a partially cutaway right side view, Figure 3 is a partially cutaway right side view showing the position of the display pin of the new device, and Figure 4 is a partially cutaway right side view. Figure 5 is a partially cutaway right side view showing the position of the display pin of the device once it has been dropped; Figure 5 is a perspective view showing the operating state; Figure 6 is a perspective view of the device;
The figure shows the state of use. Symbols in the diagram: 1... Winding drum, 2... Main shaft, 3
... Winding spring, 4 ... Centrifugal clutch mechanism, 5 ...
Lock plate, 6...Frame, 11...Spring box, 12...Bearing, 21...Brake plate, 41...Lock pawl, 42...Release spring, 5
1...disc pad, 52...screw, 53...
Display pin.

Claims (1)

[Claims for Utility Model Registration] 1. A winding spring 3 is interposed between the winding drum 1 and the main shaft 2 to automatically wind the rope so that the rotational speed of the winding drum 1 when the rope is pulled out is a specified value. The centrifugal clutch mechanism 4 attached to the winding drum 1 is activated to stop the rotation of the winding drum 1 when the rotation of the winding drum 1 is exceeded.
A lock plate 5 that engages with a lock pawl 41 provided at The fall prevention device is fixed with screws 52, and an indicator pin 53 whose tip is in contact with the lock plate 5 is inserted from the outside of the brake plate 21 and semi-fixed. 2. The fall prevention device according to claim 1, wherein the breaking strength of the screw 52 is set to 200 to 400 kg. 3. The fall prevention device according to claim 1 or 2, wherein the end of the display pin 53 opposite to the lock plate 5 is exposed on the outer surface of the frame 6. 4 Brake plate 2 where display pin 53 is located
1. A fall prevention device according to claim 1 or 2 of the utility model registration claim, in which a confirmation window is provided in the frame 6 on the fall prevention device.