Fire escape – ladder – or scaffold – Ladder – Flexible
Patent
1998-03-16
2000-05-02
Chin-Shue, Alvin
Fire escape, ladder, or scaffold
Ladder
Flexible
182234, A62B 120
Patent
active
06056086&
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns an individual anti-fall protective device and more particularly a device designed to automatically stop the fall of a person working above ground level.
BACKGROUND OF THE INVENTION
There are several individual anti-fall protective devices sliding on a support, such as a rope, orientated vertically and fixed at its upper portion.
These devices are connected by a head rope to an operator when they are intended to protect the latter from falling.
To this effect, these devices have been designed so as to slide upwards and downwards along the support and able to lock on the latter should the operator fall.
Some of the models of these devices are complicated and tighten an element on the support under the dynamic effect caused by a fall of the operator connected to the device.
The most advanced models do have the drawback of comprising a large number of fragile elements. Most of these devices mean that constant vigilance is required to ensure they are clean as they are sensitive to the presence of debris and dust which adversely affect their operational efficiency.
The U.S. Pat. No. 4,923,037 describes an automatic anti-fall stoppage device able to move along a vertical support. This device includes a mounted toothed wheel for rotating inside its housing joined to the inside of an external housing and is elastically stressed in a direction applying the toothed wheel against the support passing into a vertical channel fitted at the front portion of the external housing. When the device moves along the support, the toothed wheel is rotary-driven via its friction on the latter. If the fall speed of the device along the support reaches a predetermined value, the corresponding speed of rotation of the toothed wheel triggers a centrifugal clutch mechanism which stops rotation of the toothed wheel. The friction between the support and the stopped toothed wheel then causes the housing to pivot in a direction ensuring the tightening of the support between the toothed wheel and the external housing and locking of the device on the support.
In this device, where the toothed wheel is used both to detect the moving speed of the device and as a tightening element, the centrifugal clutch system, which triggers automatic tightening, is a costly and fragile element sensitive to dust.
The French patent published under the N.sup.o 2574511 also concerns a device for automatically tightening on a safety rope. This device includes a roller able to move along a ramp between a lower rest position, in which it is distanced from the safety rope, and an upper position where it tightens the rope so as to lock the device on the latter. A lever, hooked to the head rope connected to the user, engages the mobile roller under the dynamic effect of a fall of the user so as to bring it to a position enabling it to be tightened.
Owing to the lightness of the tightening roller able to rise along the guiding ramp under the effect of jerks or vibrations, this device is extremely sensitive to poorly controlled functioning and is likely to function erratically.
SUMMARY OF THE INVENTION
The aim of the present invention is to provide an automatic anti-fall device avoiding the drawbacks mentioned above of known types of devices and has the advantages of simplicity, sturdiness and improved efficiency.
To this end, the device is embodied by a small number of elements having simple shapes cooperating together to simultaneously implement three modes for triggering the tightening effect on the support: element and which starts its tightening movement, cam mounted in such as way so that the position of its centre of gravity with respect to its spin axis provokes an inertial effect should the device be suddenly stressed downwards which activates tightening of the cam,
According to the invention, the automatic anti-fall device, which slides without requiring any additional operation onto a safety support fixed at a point situated above said device connected to the user or a load, is of the type comprisi
REFERENCES:
patent: 5638919 (1997-06-01), Pejout
Cencic Maksimiljan
Gortan Guido
Chin-Shue Alvin
Drucker William A.
Tractel S.A.
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