Burglar alarm activated by the movement of an object to be guard

Details Burglar alarm activated by the movement of an object to be guard Burglar alarm activated by the movement of an object to be guard

1996-10-03

1998-06-02

Hofsass, Jeffery

Communications: electrical

Land vehicle alarms or indicators

For bicycle

340427, 340568, 340571, 200 6164, B62J 300

Patent

active

057606811

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a burglar alarm as set forth in the preamble of claim 1 and activated by a movement.
The operating principles of currently available burglar alarms vary widely according to an intended application. Devices for securing a building, an office, a home and other such immobile objects have often employed alarms based on an interference occurring in an electromagnetic radiation field (infrared, visible light) or a microwave field. Applications intended for providing a desired security against the unauthorized opening of covers, doors, gates or the like have employed magnets, intercepted light beams etc.
However, the above principles are not very well adaptable (because of a high price, complicated installation or operation) to burglar alarms which are needed when the intention is to secure articles whose stealing always requires that the article be moved, the purpose being to prevent the movement of an article. Such articles include e.g. a car, a boat, a motorcycle, a bicycle, a work or piece of art, an exhibit, a beach bag etc.
A problem in the alarms for this type of applications is that the prevention of false alarms and the foolproof alarming in a real-life situation are difficult to combine and accomplish as the alarming is usually effected on the "ON-OFF" principle. The prevention of thefts of cars, boats, bicycles and motorcycles or other such utility articles often produce situations that some legitimate interference may cause the movement or shift of a secured article. The authorized user of a bike, a boat etc. adjacent to a secured bike, boat etc. may accidentally stir the secured bike, boat etc. or is even forced to move it to use his or her own.
With prior art burglar alarms, this is likely to produce false alarms. In view of overcoming this problem, U.S. Pat. No. 4,845,464 proposes a vehicle burglar alarm whose activating sensitivity is programmable by the user. This prior known alarm is useful as an automobile burglar alarm but not for more general use as a burglar alarm e.g. for bicycles, briefcases or the like small articles. In the latter cases, the requirement is that an alarm, which is accessible, cannot be removed or deactivated e.g. without a key to the lock of a bicycle or the like.
Another problem with the prior known burglar alarms is the activation and re-deactivation of an alarm in a user-convenient and constructively inexpensive and reliable fashion.
An object of the invention is to eliminate the shortcomings and to provide a burglar alarm activated by the movement of an article to be secured, wherein the operation and construction are combined in a manner that the alarm has a versatile range of application in addition to operating reliability.
A further object of the invention is to provide a burglar alarm whose activation and deactivation can be effected conveniently, even automatically, yet in such a manner that the device cannot be deactivated by an unauthorized user without breaking the device or its mountings.
The above objects of the invention are accomplished on the basis of characterizing features set forth in the annexed claims.
The invention will now be described in more detail by way of exemplary embodiments with reference made to the accompanying drawings, in which
FIG. 1 is a side view of an alarm of the invention and components included therein and
FIG. 2 shows the same in a plan view.
FIG. 3 depicts an alarm of the invention in an operative situation according to one application thereof.
FIGS. 4-6 illustrate an alarm according to a second embodiment of the invention in a cut-away view and without electrical components.
FIG. 7 shows a cover for the alarm of FIGS. 4-6, and
FIG. 8 is a cross-sectional view of the alarm of FIGS. 4-7 along a section line VIII--VIII in FIG. 4 with a cover 22 locked in position.
An alarm housing 1 is made e.g. of a strong, tough plastic plastics material but it can also be made of a metal, such as aluminium or steel. The housing 1 includes a hole 2 for coupling the alarm to a bolt- or rod-shaped element include

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