Garage door opener including a linear actuator

Details Garage door opener including a linear actuator Garage door opener including a linear actuator

1977-10-26

1980-02-12

Duggan, Donovan F.

Electrical generator or motor structure

Dynamoelectric

Linear

H02K 4102

Patent

active

041885520

ABSTRACT:
A linear motor is utilized to open and close large doors such as conventional segmented overhead garage doors or large single piece slidable doors. In the linear actuator, the stator, including a two-phase winding mounted thereon, is mounted for operation in a substantially stationary position. A straight elongate channel member is utilized as an armature for the motor, and with overhead garage doors is connected at one end to a door member. With horizontal sliding doors, the armature is mounted along the top edge of the door in spaced relation therewith, except at the opposed ends thereof where it is secured to the door. Energization of the linear motor moves the elongate armature to open or close the door as desired. A fail-safe brake mechanism may be incorporated in the linear motor to lock the armature in position and therefore lock the door when the motor is not energized. The construction of the armature eliminates the periodic adjustments necessary with bicycle chain type drive systems, and the use of inexpensive channel material for the armature provides a less expensive door operator than a rotating screw drive door opener system.

REFERENCES:
patent: 1881014 (1932-10-01), Ayers
patent: 1916491 (1933-07-01), Rose
patent: 3374823 (1968-03-01), Ford
patent: 3697838 (1972-10-01), New
patent: 3852626 (1974-12-01), Davis

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