Universal quick release safety sprocket and driving assembly

Details Universal quick release safety sprocket and driving assembly Universal quick release safety sprocket and driving assembly

1995-04-20

1996-12-10

Dorner, Kenneth J.

Movable or removable closures

Optionally moved, manually, or by motor

192 6962, E05F 1500

Patent

active

055819397

ABSTRACT:
A safety coupling device for manual disengagement of a drive mechanism to the counterbalance shaft on an overhead garage door mounted in a garage structure. The device includes a first annular hub mountable on the counterbalance shaft in a fixed position with relation to the counterbalance shaft. A second annular hub with a drive sprocket connected to a motor drive is rotatably and slideably mounted on the counterbalance shaft. At least one pin or protrusion is provided on one of the hubs so that the protrusion mates with at least one hole for accepting the pin or protrusion on the other hub. When the second hub is in a first position the pin or protrusion on one hub resides within the hole of the other hub and thus engages the two hubs and permits power from the motor drive to be transmitted to the counterbalance shaft in order to raise or lower the door by the motor drive. When the second hub is in a second position the pin or protrusion is withdrawn from the hole and the hubs are disengaged. Disengagement of the hubs allows the second hub to free wheel on the counterbalance shaft and thus disconnects the motor drive mechanism, allowing manual raising or lowering of the garage door. A lever is used to move the second hub between the first position and the second position in order to disengage or engage the hubs as desired.

REFERENCES:
patent: 231828 (1880-08-01), McCord
patent: 456827 (1891-07-01), Johnson
patent: 796205 (1905-08-01), Mitchell
patent: 3643642 (1972-02-01), Junes
patent: 5048653 (1991-09-01), Fellows

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