Firearms – Safety mechanism – Firearm lock
Patent
1991-03-15
1991-09-03
Carone, Michael J.
Firearms
Safety mechanism
Firearm lock
285 80, 403 15, 403324, F41A 1744
Patent
active
050441051
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a locking device which, upon actuation, is locked to a hollow body within which the device is situated. Although of general applicability the preferred embodiment of locking device is particularly suitable for forming part of a safety device for firearms, the safety device being adapted to be secured by a key within the chamber of a firearm and to be locked permanently to the chamber of the firearm upon actuation of the locking device of the invention.
According to one aspect of the present invention there is provided a locking device which, upon actuation, is locked to a hollow body within which the device is situated, the locking device comprising: a body having a central longitudinal bore and a plurality of radial passages extending from the bore radially outwardly to the surface of the body; a locking pin located in each passage with the radially inner end of each pin located extending into the bore; an actuating member located in the bore, the actuating member having a cylindrical region and a tapering region which tapers inwardly from the cylindrical region and being positioned such that upon axial movement of the actuating member the locking pins will be cammed radially outwardly by the tapering region and thereafter locked in a radial outward position by the cylindrical region; a piston mounted in the cylinder and coupled to the actuating member for axially moving the actuating member; an explosive charge for driving the piston; and means for detonating the explosive charge in response to application of axial force to one end of the device.
A security device, particularly suitable for shot guns, has been proposed which has the overall size and configuration of a shot gun cartridge, but which incorporates a lock which enables the device to be locked into the chamber of a shot gun. One such device of this type incorporates a ring which is cammed radially outwardly by a taper to lock the security device into engagement with the wall of the chamber. Such devices suffer, however, from the disadvantage that they can often be forced from the chamber by inserting a suitable drift through the barrel from the muzzle end to apply an axial force to the security device.
If a locking device in accordance with the present invention is incorporated within the security device any attempt to remove the security device in this manner will result in detonation of the explosive charge with the result that the locking pins will be driven radially outwardly into locking engagement with the walls of the chamber. Once this has occurred extreme force will be necessary to drive the security device from the chamber, and the application of such force will result in substantial damage to the chambers of the gun.
Whilst the invention is particularly suited to use in a security device for a firearm it will be appreciated that it is of more general applicability and may be used to provide a plug which may be installed extremely rapidly within a hollow body to provide a permanent closure to the hole in which the device is located.
The invention will be better understood from the following description of a preferred embodiment thereof, given by way of example only, reference being had to the accompanying drawing wherein the single Figure illustrates schematically in partial axial cross-section a preferred embodiment of the invention.
Referring to the drawing there is illustrated an embodiment of locking device 1 according to the present invention which forms part of a security device 2 for a shot gun. The overall configuration of the security device 2 is similar to that of a conventional shot gun cartridge so that the entire security device may be positioned within the chamber of a shot gun. Once the security device has been so positioned a key operated lock 3 (which is only shown in outline in the drawing) is actuated to rotate a screw threaded member 4 which draws the lock housing 5 towards the body 6 of the locking device. An end region 7 of the body 6 is formed with a taper on which is mounted a split r
REFERENCES:
patent: 37946 (1863-03-01), Bonanzo
patent: 1458271 (1923-06-01), Clark
patent: 2819733 (1958-01-01), Maisch
patent: 2937666 (1960-03-01), Maisch
patent: 3193959 (1965-07-01), Jaycox
patent: 4245567 (1981-01-01), Herrmann
patent: 4827649 (1989-03-01), Sheehan
Bellamy Roger
Lindley Adrian Q.
Camloc (U.K.) Limited
Carone Michael J.
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