Electronic delay timer and alarm system

Details Electronic delay timer and alarm system Electronic delay timer and alarm system

1990-07-02

1992-11-17

Crosland, Donnie L.

Communications: electrical

Systems

Timer control

34030915, 340516, 340527, 340532, 340692, 340329, 340384R, 340679, 361 1, 361 95, 417 12, 417 7, 307141, G08B 100

Patent

active

051651076

ABSTRACT:
A time delay and alarm system is provided to ensure safe operation of periodically activated apparatus having potentially dangerous moving parts. The system preferably employs a 555 type integrated timer circuit, a horn, and a pulse generator which causes the horn to produce a cyclical sound.

REFERENCES:
patent: 1709517 (1929-04-01), Billingsley
patent: 1790681 (1931-02-01), Smith
patent: 2864049 (1958-12-01), Sheets
patent: 3191114 (1965-06-01), Reed
patent: 3631447 (1971-12-01), Sulat et al.
patent: 3778809 (1973-12-01), Hawes
patent: 4110742 (1978-08-01), Hawkins
patent: 4206448 (1980-06-01), Davis
patent: 4266221 (1981-05-01), Hawkins
patent: 4297678 (1981-10-01), Lee
patent: 4821024 (1989-04-01), Bayha

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