Movable or removable closures – With operator for movably mounted closure – Remote actuating or initiating station
Patent
1977-01-24
1978-10-31
Kannan, Philip C.
Movable or removable closures
With operator for movably mounted closure
Remote actuating or initiating station
49 26, 49 70, 49192, 188 32, E05F 1100
Patent
active
041226291
ABSTRACT:
A safety apparatus which includes a gate positioned adjacent the free edge of a loading dock and swingable between a substantially horizontal position wherein it is adapted to extend across the rear of a truck, and a vertical position permitting access between the dock and the truck. In a preferred embodiment, the swinging movement of the gate is controlled by an electrical switch mounted on a wheel chock located within the truck parking area. When a truck is positioned adjacent the dock, the chock is wedged in front of the truck tire. This causes activation of the switch so that a motor is energized to cause the gate to be swung upwardly into an approximate vertical position. Whenever the switch is released, as due to removal of the chock from engagement with the tire, then the motor is automatically reversely energized to swing the gate into its lowered horizontal position.
REFERENCES:
patent: 1493317 (1924-05-01), Bernard
patent: 1945295 (1934-01-01), Pranger
patent: 1952641 (1934-03-01), Vincent
patent: 3034240 (1962-05-01), Holt
patent: 4010571 (1977-03-01), McGuire et al.
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