Alarm system

Details Alarm system Alarm system

1987-11-19

1989-08-15

Scott, J. R.

Electricity: circuit makers and breakers

Special application

Actuated concurrently with operation or use of art device

200300, 340303, H01H 316, H01H 902, G08B 2500

Patent

active

048576794

ABSTRACT:
An alarm switch has a box for mounting on a supporting surface, a front plate movably mounted in the box, a frangible element having a plurality of frangible areas spaced in succession thereon and each of which can be broken off the frangible elements, a stop element on either the box or the front plate, and the frangible element being on the remaining one of the box and the front plate, the stop element and the frangible element being positioned for, when the front plate is moved from a normal position relative to the box, the stop element and one of the frangible areas are engaged for causing the frangible area to be broken off the frangible element, and the frangible element and the stop element being shiftable relative to each other for, after one frangible area has been broken off, bringing the stop element and the next frangible area in succession into position for being engaged with each other when the front plate is moved again, and a switch unit operatively connected to the front plate for being operated when the front plate is moved sufficiently far from the normal position to cause a frangible area to be broken off the frangible element.

REFERENCES:
patent: 2822451 (1958-02-01), Holmes
patent: 3143611 (1964-08-01), Nansel
patent: 3715743 (1973-02-01), Denton

Affiliated with

Also associated with

Rating

Alarm system does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Alarm system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Alarm system will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-122986