Locks – Special application – For antitheft signaling device on protected article
Patent
1996-03-21
1997-12-16
Boucher, Darnell M.
Locks
Special application
For antitheft signaling device on protected article
70165, 70163, 123198B, E05B 6500
Patent
active
056972326
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a device for preventing unauthorized use of an engine provided with spark plugs, and particularly, but not exclusively, to devices of the kind with which it is necessary to disconnect the ignition cable from a spark plug and then create conditions which enable the spark plug to be covered by the device in a manner which will prevent the device from being readily removed from the spark plug.
The invention is based on a device which includes a sleeve which can be fitted over a spark plug when the ignition cable has been removed therefrom and which has a locking part which coacts with the spark plug, wherein the sleeve and said locking part can be locked in mutual relative positions or can be positioned so as to be movable relative to one another.
Although the invention can be applied with different types of engines, it finds particular use in preventing the theft of motorcycles, snow scooters and like vehicles, or at least making such theft difficult to achieve.
DESCRIPTION OF THE PRIOR ART
Swedish Patent Application 7606432-8, Publication No. 404,159, teaches a method and a device for preventing unauthorized use of internal combustion vehicles, ships, engine-driven tools and implements, and simply engines or motors, and is based on the removal of spark plugs from an engine and replacing the spark plugs with a body which has an external screw-thread which corresponds to a spark plug housing attachment and which is rotatably or pivotally connected to a sleeve-like part which extends from the engine block and intended to encircle a locking mechanism.
The locking mechanism can be brought by means of a key to a position in which it joins the screw-threaded part non-rotatably to the sleeve-like part when mounting the body on and removing said body from the engine block, wherein the locking mechanism is also adapted to be brought, with the aid of said key, to a position in which the sleeve-like part extending from the engine block is able to rotate freely in relation to the threaded attachment part and therewith make it impossible to remove the body from a position in which it is attached to the engine block.
Swedish Patent Application 7714838-5, publication No. 413,046, teaches a corresponding device referred to as a spark plug lock, which is intended to improve the construction described in the introduction, by using a locking device which does not require removal of the spark plug. However, this construction requires the provision of a separate holder which is fitted between the spark plug and the engine block.
This known device includes an outer cylindrical housing which is intended to embrace a key-operated lock mechanism and a sleeve-like rotor which coacts with the housing and is enclosed within said housing and which, with the aid of the lock mechanism, can be caused to lock non-rotatably with the housing and to be arranged for rotation in relation to the housing respectively.
The rotor interior includes a space for receiving the isolator of a spark plug and ignition line connection means.
The rotor is provided at its bottom end with an internal screw-thread which is intended to mesh with an external screw-thread on a cylindrical holder, this holder including an upper hexagonal recess which is intended to receive a hexagonal spark plug, and therebeneath a cylindrical space which receives the cylindrical base part of the spark plug, wherein the height or vertical extension of the holder is such as to enable a spark plug with the holder fitted thereto to be screwed into the engine block in a normal manner.
DISCLOSE OF THE INVENTION
TECHNICAL PROBLEMS
When studying the present state of the art as described above, it will be seen that a technical problem resides in providing a locking device/particularly a spark plug locking device, which is constructed so as to enable it to be brought into and out of coaction with a spark plug without needing to fit additional devices, such as a holder, to the spark plug.
Another technical problem with regard to a loc
REFERENCES:
patent: 1322905 (1919-11-01), Just
patent: 1771382 (1930-07-01), Kramer
patent: 1782584 (1930-11-01), Ryan
patent: 1998050 (1935-04-01), Gasdorf
patent: 2532972 (1950-12-01), Vertin
patent: 2584545 (1952-02-01), Caferro
patent: 2669896 (1954-02-01), Clough
patent: 2802691 (1957-08-01), Barr
patent: 4442619 (1984-04-01), McCarley
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