Communications: electrical – Land vehicle alarms or indicators – Of burglary or unauthorized use
Patent
1991-10-08
1993-12-28
Crosland, Donnie L.
Communications: electrical
Land vehicle alarms or indicators
Of burglary or unauthorized use
340544, 340568, 340571, 340590, 340591, 340592, B60R 2510, B62H 500
Patent
active
052743535
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an anti-theft device and in particular to an anti-theft device of the type comprising a relatively flexible and deformable elongated assembly which is capable of forming a loop and is provided at one end with a male closure member and at the other end with a female closure member adapted to receive and lock the male closure member, one of said closure members being provided with a closure device which can be opened by means of a key in order to release the other closure member.
An anti-theft device of this type is intended in particular to protect two-wheeled vehicles or other moving equipment which it is desired to immobilize.
Two-wheeled vehicles, bicycles, auxiliary-engined bicycles, motorcycles, scooters and so on are often protected against theft by means of fastening cables or chains having a structure of more or less substantial strength. This does not prevent a person who has at his disposal a pair of pliers, shears, a hand-saw, a portable disk-saw, a crowbar, from releasing the vehicle in a very short time without attracting attention.
Since a cable can readily be sheared or cut, it is known to provide an anti-theft device of the type comprising a cable on which are threaded interengaged sleeves made of surface-treated steel. These sleeves have a surface hardness such that they cannot be attacked by the conventional cutting tools mentioned above. It is known, however, that these devices can be opened by means of a crowbar. Thus it is only necessary to place the crowbar substantially in the axis of the loop formed by the cable and to rotate the crowbar about an axis perpendicular to said bar so as to twist the cable first in a figure of eight, then in the form of a twisted pair. By tightening the twisted pair with sufficient force, it is thus possible to develop within the cable tensile stresses such that the strands of the cable break away from the locking members which are secured to the cable ends whilst the cable itself remains intact.
The object of the present invention is to overcome the disadvantages of known anti-theft devices and to propose an anti-theft device of the above-mentioned type which affords resistance to breaking-open by cutting, shearing, sawing, chain or disk sawing, which is simple and convenient to use, which is relatively inexpensive, and which cannot be opened by twisting by means of a crowbar.
In accordance with the invention, the anti-theft device is characterized in that the elongated assembly is made up of elongated elements undetachably assembled together in interengaged relation in the same manner as a chain, said elements being capable of presenting a certain angular divergence with respect to elements being provided with interengagement and coupling means which are alone intended to afford resistance to any forces which would separate these elements from each other.
The device in accordance with the invention is thus not provided with any cable whose attachment to the locking members located at its respective ends would constitute a weak point of the device in the event of an attempt to force-open the device by twisting.
Moreover, the limited angular divergence which is possible between two adjacent elongated elements limits the deformability of the anti-theft device and prohibits any attempt to twist this latter.
Thus, by going against an old preconceived opinion that a cable was necessary in an anti-theft device of the type mentioned above owing to its flexibility and exceptional characteristics of tensile strength, the present invention offers a simple solution to the problem stated in the foregoing.
In accordance with a first embodiment of the invention, each elongated element is made up of two separate and distinct parts articulated with respect to each other, on the one hand a substantially tubular shell provided at one end with a tapered portion having an axial opening smaller in diameter than the internal diameter of the tubular portion, on the other hand a pin having a cylindrical body which is intended to pass through sai
REFERENCES:
patent: 1800943 (1931-04-01), Junkunc
patent: 3765196 (1973-10-01), Balicki
patent: 3866205 (1975-02-01), Payne et al.
patent: 4340007 (1982-07-01), Hogan
patent: 4698620 (1987-10-01), Marshall
patent: 4920334 (1990-04-01), DeVolpi
Crosland Donnie L.
Laumonier Alain
Laumonier Bruno
Laumonier Yves
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