Garage door opener

Details Garage door opener Garage door opener

1977-07-01

1979-04-03

Downey, Kenneth

Machine element or mechanism

Gearing

Directly cooperating gears

49199, 49139, F16H 118

Patent

active

041470737

ABSTRACT:
The invention relates to a power door opener, such as the type of opener used for opening overhead garage doors includes a worm gear rod having a major thread and a carrier member coupled to the door and releasably engageable with the major thread for moving the door between open and closed positions as the rod rotates. A second thread whose pitch is smaller than the major thread is formed on the rod and on a portion thereof located between a pair of spaced apart limit switches. A control member threadably engages the second thread for movement between the limit switches as the rod rotates for terminating motor operation as the door moves into its open and closed positions. The carrier member is mounted for radial movement into and out of engagement with the major thread to permit manual operation of the door.

REFERENCES:
patent: 2221039 (1940-11-01), Babcock
patent: 2686577 (1954-08-01), Hoppenjans
patent: 3051014 (1962-08-01), Houk
patent: 3069151 (1962-12-01), Cook et al.
patent: 3261728 (1966-07-01), Slopa et al.
patent: 3772141 (1973-03-01), Miller
patent: 3858452 (1975-01-01), Gatland et al.
patent: 3909980 (1975-10-01), Courtney
patent: 3996697 (1976-12-01), Bailey et al.
patent: 4028850 (1977-06-01), Marzocco

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