Closure fasteners – Keepers
Patent
1996-08-12
1998-05-19
Lindsey, Rodney M.
Closure fasteners
Keepers
292346, 340542, 340545, E05B 1502
Patent
active
057527288
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
The invention relates to an alarm-triggering locking mechanism for the lock and/or hinge area of a door to be secured or a window to be secured, with a first blocking device for the locking mechanism, which must be overcome by the application of force, with a second blocking device for the locking mechanism, which is harder to overcome by the effect of force, and with means which trigger an alarm when the first blocking device is overcome, wherein, after the first blocking device has been overcome, the movement of the locking mechanism in the direction of opening of the door or the window is limited by the second blocking device.
The basic mode of functioning of this locking mechanism is known from DE 42 21 585 A1 and consists in that, in case of a break-in, the first blocking device is initially overcome by force, in the process of which an alarm is triggered. This is preferably the triggering of a silent alarm by means of which the breaking open is reported to an alarm center. However, after triggering the alarm, the burglar is now prevented from entering the building by the second blocking device, which offers a greater resistance in comparison with the first blocking device. It is now necessary for him to make greater exertions to overcome this second blocking device, too, wherein the time required for this gives the support personnel or the police an opportunity to reach the location of the break-in.
The known locking device is embodied as an additional security element, which entails an additional outlay in material and expenses during manufacture and installation. Further than that, the installation of this additional security device in a visually neutral and unobtrusive way presents problems.
An object of the instant invention is to provide an alarm-triggering locking mechanism of the species mentioned at the outset which is easier to install and can replace a conventional locking plate in a lock and/or hinge area in a simple way.
This object is attained in accordance with the invention in that the locking mechanism has a locking plate which can be attached to a door or window frame by means of securing screws or bolts embodied as the first blocking device, and that the second blocking device is embodied as at least one striker element, which is rigidly connected or connectible with the locking plate or the wing of the door or window and which, following a limited movement of the locking plate in the opening direction, comes to rest on at least one counter-striker element anchored on the door or window frame.
Since the locking mechanism in accordance with the invention is embodied as a locking plate, it can be used in a simple manner in place of a known locking plate and is therefore also suited for retrofitting. The locking plate in accordance with the invention can be realized without problems in the shape of known locking plates, in particular in the form of locking plates with an L-shaped cross section in the locking area of a door or a window or of locking plates in the hinge area. A burglar will not notice that a safety alarm has been installed when breaking open a door or window, particularly if it has been provided as a silent alarm system, i.e., when overcoming the first blocking device a radio or telephone alarm is forwarded to a security company manned around the clock. If, after overcoming the first blocking device, the burglar encounters the second blocking device, he will either already give up the attempt, or it will be possible to catch him red-handed and arrest him, since he is delayed by the second blocking device after triggering the alarm. Thus, in general he can be arrested even before he enters the building. The deterrent success based on this type of security should have a long-term preventive effect, which should lead to a considerable damage reduction. The additional financial and installation outlay for attaching the locking plates in accordance with the invention, in particular in connection with already installed alarm systems with a silent alarm, is relat
REFERENCES:
patent: 3704460 (1972-11-01), Frank
patent: 3978467 (1976-08-01), Albert
patent: 4390867 (1983-06-01), Queren
patent: 5257841 (1993-11-01), Geringer et al.
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