Microcontroller based automatic door obstruction detector

Details Microcontroller based automatic door obstruction detector Microcontroller based automatic door obstruction detector

1989-07-26

1990-12-25

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318286, H02J 300

Patent

active

049806181

ABSTRACT:
A microprocessor controlled automatic door opener including means for detecting the velocity and direction of travel of the door. The microcontroller evaluates detected changes in either the velocity or direction of travel to determine the cause, and either reverses door travel direction or ignores the detection.

REFERENCES:
patent: 3525918 (1970-08-01), Parnell
patent: 4234833 (1980-11-01), Barrett
patent: 4259625 (1981-03-01), Hatakeyama et al.
patent: 4338552 (1982-07-01), Pilz et al.
patent: 4468596 (1984-08-01), Kinzl et al.
patent: 4491775 (1985-01-01), Harvey et al.
patent: 4563625 (1986-01-01), Kornbrekke et al.
patent: 4713591 (1987-12-01), McCloskey
patent: 4736144 (1988-04-01), Chun-Pu

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