JPH0627874U - Fall prevention device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a fall prevention device that operates reliably with a simple structure, and that has a short time from the break of the main rope to the operation and the drop distance is small. [Structure] In a box body 1, a gear 5 rotatable around a shaft 2 fixed to a lower portion of the box 1 and a shaft 8 attached to an arm 7 of a hook 7a connected to a main rope 14. A rotatable gear 10 is provided, and both gears 5,
10 is provided with a chain winding portion, and the fall prevention chain 3 having one end fixed is wound around the chain winding portion of both gears 5 and 10, and one end of the fall prevention chain 3 is lowered and is lifted to the outside of the box 1. A fall prevention device which is provided with a connecting tool 13 used for connection with an object or which is adapted to attach an object to be lifted directly to the box 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This device is designed to prevent the suspended objects from falling when the chain block, elevator, crane, and other main ropes for lifting industrial machinery, chains, wires, etc. are cut or come off due to trouble. Regarding prevention device.

[0002]

[Prior art]

 Conventionally, electric chain blocks, etc. have been used in two-tiered parking lots, etc., and fall prevention devices have not been installed to avoid the danger of dropping during lifting or hanging work. There is also a structure that does not surely prevent the fall even if it is attached, or it cannot be stopped instantly when the main rope, chain, or wire breaks, and it stops after falling for a certain distance, The structure was complicated, there were many failures, and there were some that lacked safety. The same was true for elevators, cranes, and other lifting industrial machines other than chain blocks.

[0003]

[Problems to be solved by the device]

 Therefore, the present invention was devised to eliminate the drawbacks of the above-mentioned conventional techniques, and when the main rope, chain, wire, etc. are cut or come off, the load of the object being lifted is instantly stopped. With regard to the chain or wire rope, the two gears mesh with each other to function as a brake to prevent falling, and with a simple structure, it operates reliably and from the time the main rope or chain, wire, etc. breaks until the operation. The present invention provides a fall prevention device with almost no time loss, and therefore less impact when stopping.

[0004]

[Means for Solving the Problems]

 An embodiment of the present invention will be described with reference to the drawings. A box body 1 is provided, and a fixed shaft 2 is provided in the lower part of the box 1 and is rotatable about the shaft 2 so that a chain or a wire rope 3 does not slip. A gear 5 having a portion to be wound (chain gear 4) is provided, and an arm 7 having a hook 7a is projected from a hole 6 opened on the upper surface of the box 1 with the hook 7a facing upward, and the arm 7 has a root 7b inside the box. Is larger than the hole 6 so that the upper surface of the box 1 can slide between the hook 7a and the root 7b. The shaft 7 is attached to the root 7b, and the chain or wire rope 3 is rotatably attached to the shaft 8. It has a part that can be wound so that it does not slip (chain gear 9), and when it comes in contact with the gear 5 provided at the bottom of the box, a gear 10 that fits is attached, and from the other hole 11 opened on the top of the box Insert the drop-prevention chain or wire rope 3 that has been fixed to the outside, and wrap it around the chain winding part (chain gear 4) of the gear 5 in the lower part of the box 1 from the outside, and further to the base 7b of the arm 7 with the hook on the upper part. The chain winding part (chain gear 9) of the attached gear 10 is also wound from the outside, and further it is pulled down from the hole 12 opened in the lower surface of the box, and the connecting tool 13 for connecting the object to be lifted is attached to the outside of the lower surface of the box. It is composed of protruding parts.

This device operates at the moment when the main rope or chain for lifting or wire 14 attached to the hook 7a breaks or comes off due to a trouble. First, the suspended object and all the weight of the device rests on the fall-stop chain or wire rope 3. Then, since the chain or wire rope 3 is pulled, the toothed wheel 10 and the arm 7 with the hook for attaching the toothed wheel 10 are lowered, and the gear 10 is pressed against the gear 5 attached to the lower portion of the box 1. At this time, the gears 10 and 5 are acted on by forces that rotate in mutually opposite directions, but cannot rotate at the moment when the gears mesh. As a result, the wrapped chain or wire rope 3 does not slip, so that the entire device stops falling and thus prevents the hanging object from falling.

In the embodiment shown in the drawings, the gears 5 and 10 are pawl gears. However, as long as both gears are engaged with each other, they can be firmly meshed with each other, and the gears 5 and 10 are tough and do not lack teeth. However, the gear is not limited to the pawl gear, and another gear may be used. Although the drop chain or the wire rope 3 is shown as a chain and the chain winding portions 4 and 9 are shown as chain gears, the wire rope and the wire rope may be constructed so that they can be wound so as not to slip. The gears 5 and 10 are separated when the main rope is under load and can be freely rotated by the fall-stop chain or wire rope 3 when raising and lowering normally.

Further, although the connecting tool 13 is a hook in the drawing, the connecting tool 13 is not limited to the hook and may be any one that can reliably connect an object and can bear a load. The position of the connector 13 is not limited to the lower surface of the box 1 and may be anywhere in the box 1.

Instead of installing the connection tool 13 and connecting the object to be hung up, the object to be hung up may be directly fixed to the box 1. The fixing place may be anywhere in the box 1.

The fall-stop chain or the wire rope has strength equal to or higher than that of the main rope, and when the main rope is used to hang or suspend an object, the gears 5 and 10 are separated from each other, so that almost no load is applied. It does not interfere with the lifting and lowering of objects.

[0010]

[Effect of device]

 According to the present invention, when the main rope is cut or comes off, the load is momentarily applied to the chain or wire rope to stop the fall, and thus the fall is stopped only for a short time and the distance for the gears to mesh. And the impact on the drop chain or wire rope is small. Since it has a simple structure, it is possible to provide an inexpensive fall prevention device that operates reliably without failure. Therefore, it can be used for any device such as chain block, elevator, crane and other industrial machinery for hoisting, it can prevent a fall accident due to trouble of the main rope, and it has extremely beneficial effects such as improving safety. .

[Brief description of drawings]

FIG. 1 is a central sectional view showing a main rope according to an embodiment of the present invention being lifted.

FIG. 2 is a cross-sectional view taken along the line AB of the embodiment of the present invention during suspension by the main rope.

FIG. 3 is a central cross-sectional view showing an operating state of an embodiment of the present invention.

FIG. 4 is a CD cross-sectional view showing the operation of the embodiment of the present invention.

[Explanation of symbols]

 1 Box Main Body 2 Shaft 3 Drop-stop Chain or Wire Rope 4 Chain Gear 5 Gear 6 Hole 7 Arm with Hook 7a Hook 7b Root 8 Axis 9 Chain Gear 10 Gear 11 Hole 12 Hole 13 Connector 14 Main Rope or Chain or Wire

Claims (1)

[Scope of utility model registration request] 1. When lifting and lowering a heavy object,
Main ropes, chains, wires, etc.
In a device that prevents a suspended object from falling when it is cut or comes off due to a trouble, a box main body is provided, and a gear that is rotatable around an axis fixed to the box and a main Provide a rotatable gear around the shaft attached to the arm connected to the rope, provide a chain or wire rope winding part on both gears, and fix a drop-stop chain or wire rope with one end fixed to the chain or wire of both gears Wrap around the rope winding part, one end of the chain or wire rope hangs downward, and the outside of the box is provided with a connection tool to connect with the object to be lifted, or the object to be lifted is directly attached to the box Characteristic fall prevention device.