Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1995-06-06
1996-08-13
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
200 6153, 340540, 340601, 340667, G08B 1300, H01H 3514
Patent
active
055460763
ABSTRACT:
An earth-tremor-responsive light contained in a main housing is described having a back member for mounting against a vertical wall and a light transmitting front cover; a stand-by battery; a light emitter; electrical circuit elements connecting the battery to the light emitter through an inertial switch which is actuated by acceleration resulting from earth tremors, the inertial switch including a switch chamber having a generally horizontal shallow upwardly-facing conical surface with a central apex at a lower point thereof; a spherical ball urged by gravity to rest in a central disposition on the conical surface; a vertical shaft projecting externally of the main housing and disposed in the chamber aligned with the central apex and above the ball, the shaft being guided for vertical movement in the chamber and having a lower end resting on top of the ball; a spring urging the shaft downwardly to a set position against the ball at rest in its central disposition, whereby a peak acceleration resulting from an earth tremor shaking the switch and exceeding a predetermined magnitude will displace the ball and conical surface relatively horizontally to an extent that the shaft will be urged to drop downwardly from its set position by the spring toward the central apex and thus hold the ball displaced in an offset disposition relative to the central apex of the conical surface; first electrical contact elements carried by the vertical shaft in a first state when the ball is in the central disposition and being shifted to a second state when the ball is displaced to its offset position; and second electrical contact elements engaged by the first contact elements when shifted to their second state to actuate the switch and complete the electrical circuit such that the light emitter is energized, the first electrical contact elements being resettable to the first state by externally lifting the shaft against the spring and allowing the ball to return by gravity to the central disposition, and returning the shaft to its set position.
REFERENCES:
patent: 3812308 (1974-05-01), Bell et al.
patent: 4219708 (1980-08-01), Rubey
patent: 4467153 (1984-08-01), Jones et al.
patent: 4528559 (1985-07-01), Freeman
patent: 4591676 (1986-05-01), Jackman et al.
patent: 4764761 (1988-08-01), Maguire, III
patent: 4789922 (1988-12-01), Cheshire
patent: 4833281 (1989-05-01), Maples
patent: 4841287 (1989-06-01), Flig et al.
patent: 5001466 (1991-03-01), Orlinsky et al.
patent: 5119841 (1992-06-01), McGill
patent: 5149926 (1992-09-01), Ono
patent: 5192839 (1993-03-01), Imade et al.
patent: 5237135 (1993-08-01), Wolski
Kalidon Technology, Inc.
Swann Glen
LandOfFree
Earth-tremor-responsive light does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Earth-tremor-responsive light, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Earth-tremor-responsive light will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1051597