Machine element or mechanism – Mechanical movements – Reciprocating or oscillating to or from alternating rotary
Patent
1992-04-01
1993-06-29
Herrmann, Allan D.
Machine element or mechanism
Mechanical movements
Reciprocating or oscillating to or from alternating rotary
74110, 74527, 49139, 49199, 160188, 403328, E05F 1154, E05F 1516, G05G 506
Patent
active
052224031
ABSTRACT:
A door operator for a reversibly operable door, such as a garage door includes a frame, a motor on the frame, a flexible drive member connected to the motor, and a carriage is mounted for movement along the frame. The carriage moves generally parallel to a portion of the frame and is attached to the door to open and close the door by movement of the carriage along the frame. The carriage can be selectively engaged and disengaged from the flexible drive member using an actuating member extending from the carriage. The carriage and the flexible drive member are engaged and disengaged upon successive motions of the actuating member in a direction substantially perpendicular to the direction of travel of the carriage. The same motion of the actuating member is used to both engage and disengage the mechanism, with successive actions performing the engagement and the disengagement, so that it is not necessary for the user to memorize a complicated engagement or disengagement procedure in order to perform the operation. The mechanism may include a lever bar that provides leverage to the engaging and disengaging action, so that the force applied by the user to the vertically extending actuating member is increased to overcome any resistance resulting from the load on the carriage. The carriage may be adapted for use with an enclosed rail or frame extension and may be comprised of multiple parts that may be disassembled, permitting the carriage to be removed from the frame at any location and eliminating the need for removal of the carriage only through the end of the frame.
REFERENCES:
patent: 2946237 (1960-07-01), Hebert
patent: 3051014 (1962-08-01), Houk
patent: 3630094 (1971-12-01), Carli
patent: 3722141 (1973-03-01), Miller
patent: 3858452 (1975-01-01), Gatland et al.
patent: 4597428 (1986-07-01), Iha
patent: 4628636 (1986-12-01), Folger
patent: 4905542 (1990-03-01), Burm et al.
Angelini Thomas
Crock Terry L.
GMI Holdings Inc.
Herrmann Allan D.
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