Closure retention apparatus for automatic doors

Details Closure retention apparatus for automatic doors Closure retention apparatus for automatic doors

1985-02-26

1986-09-30

Shoop, Jr., William M.

Electricity: motive power systems

Motor-reversing

Periodic- or intermittent-reversing

318286, 318436, H02P 706, H02P 122

Patent

active

046149023

ABSTRACT:
This invention relates to closure retention apparatus for automatic doors, and more particularly to an electrical circuit for providing a reduced amount of electrical power to the motor which controls the opening and closing of the door. The circuitry includes first circuit means for applying a first level of power temporarily to said motor for operating the door from open toward closed position, and a second circuit for applying a second, reduced level of power continuously to the application of the first level power thereto for a preselected period of time for operating said door toward closed position also.

REFERENCES:
patent: 3551770 (1970-12-01), Isaacs
patent: 3893012 (1975-07-01), Lin
patent: 3969658 (1976-07-01), Htsui
patent: 4289995 (1981-09-01), Sorber et al.
patent: 4471274 (1984-09-01), Ross et al.
patent: 4476416 (1984-10-01), Licata et al.

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