Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum
Patent
1996-12-05
1999-06-15
Matecki, Katherine
Implements or apparatus for applying pushing or pulling force
Apparatus for hauling or hoisting load, including driven...
Device includes rotatably driven, cable contacting drum
254266, 254399, B66D 128
Patent
active
059114100
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention refers to a hoisting and lowering apparatus.
BACKGROUND OF THE INVENTION
A hoisting and lowering apparatus, e.g. according to European patent publication EP-A-0 480 117 of the applicant, are preferentially used for the purpose of raising or lowering persons or loads on a rope. Preferred fields of application are rescue operations or generally the mobile application of such apparatus. Essentially, the hoisting/lowering apparatus have the function of reducing the retention force in the lowering operation, combined with a safety against an uncontrolled fall of the person or load suspended on the rope.
It has been found that the known hoisting/lowering apparatus should be variably equipped according to the actual conditions of application. For example, it should be possible with the hoisting/lowering apparatus to form a lifting block, or a possibility for the attachment of a spring hook etc. is required. However, in known hoisting/lowering apparatus, some of these different options have mutually excluded each other or, if designed for maximum functionality, they have led to an unconveniently large and heavy appliance.
Also, as the case may be, the use of a hoisting/lowering apparatus which is not adapted to the actual conditions of application can lead to an overload of the rope as well as to safety risks due to a possible overload of the safety devices of the hoisting/lowering apparatus. The consequences are the need for a premature replacement of the rope and the risk of rupture of the rope and of malfunctions of the appliance.
Usually, these known hoisting/lowering apparatus include a large-volume pulley having a large volume which is provided with a return stop. In most cases, a rope is wrapped 21/2 times around said pulley. In operation, the pulley is running freely during hoisting and offers little resistance. In descending, however, the pulley is blocked by the return stop, and the rope slides over the surface of the pulley. The resulting friction takes up the greater part of the load suspended on the rope.
Furthermore, an emergency stop for the rope is often provided on the load the of the pulley. Essentially, said rope stop senses the running speed of the rope particularly in the descending direction. In the case of an excessive speed, the rope stop is released and directly blocks the rope.
However, in practice, the known hoisting/lowering apparatus of this type cause a considerable wear of the rope by overcrossing windings on the pulley, in the passage of the known emergency stop, and especially when the latter is released. This wear reduces the resistance of the rope and the action of the emergency stop may cause a rupture of the rope, and the function of the hoisting/lowering apparatus is impaired since the frictional resistance on the pulley is altered.
SUMMARY OF THE INVENTION
It is an object of the present invention to reduce the wear of the rope in a hoisting/lowering apparatus.
Another object of the present invention is to provide a device allowing a hoisting/lowering apparatus to be adapted to a large number of different requirements in use.
Such devices as attain at least one of the cited objects are indicated in the independent claims. The further claims define preferred embodiments of the device of the invention.
Accordingly, one aspect of the invention is to provide a hoisting/lowering apparatus which essentially corresponds to the state of the art, with an adaptor for the attachment of different accessories such as a holder having a loop for the insertion of a spring hook or different pulley assemblies for the formation of a lifting block. The adaptor is preferably designed as a self-locking plug-in coupling, so that the attachment of accessories is obtained simply by insertion.
The wear of the rope in a hoisting/lowering apparatus can also be reduced by placing the rope stop on the traction side. In this case, however, on account of the lower tension of the rope on the traction side, especially when the latter slips from the hold of th
REFERENCES:
patent: 840676 (1907-01-01), Winnard et al.
patent: 2463394 (1949-03-01), King
patent: 4084794 (1978-04-01), Wallace
patent: 4098492 (1978-07-01), Wilkinson
patent: 4721286 (1988-01-01), Hey et al.
patent: 4850571 (1989-07-01), Cabanos
Matecki Katherine
Rollgliss AG
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