Garage door opener

Details Garage door opener Garage door opener

1998-06-30

2000-02-01

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Radiant energy

318266, G05B 500

Patent

active

060207035

ABSTRACT:
A power actuated door opener is disclosed with a beam break system for detecting obstructions in a door opening. A transmitter includes a beam emitter and emitter drive circuit for transmitting a train of emitter pulses to a receiver. The receiver includes a pulse detector circuit with a beam detector for producing detector pulses in response to emitter pulses impinging on the detector. The emitter drive circuit and the pulse detector circuit are synchronously coupled with each other and the pulse detector circuit produces a normal output signal only if the detector receives a pulse which is in synchronism with an emitter pulse. The receiver includes an annunciator which produces an audible and a visible warning signal when the pulse detector circuit produces a fault output signal. The audible annunicator is a piezoelectric crystal mounted in the receiver housing with a cover plate operating as a sounding board.

REFERENCES:
patent: 5233185 (1993-08-01), Whitaker
patent: 5285136 (1994-02-01), Duhame
patent: 5384495 (1995-01-01), Waggamon et al.
patent: 5428923 (1995-07-01), Waggamon
patent: 5461227 (1995-10-01), Blau
patent: 5508511 (1996-04-01), Zur et al.

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