Movable or removable closures – Operator interrelated with closure latch release – Motor driven
Patent
1975-03-14
1977-07-19
Schultz, William H.
Movable or removable closures
Operator interrelated with closure latch release
Motor driven
49387, E05F 100
Patent
active
040359557
ABSTRACT:
A boom gate comprises a first-class lever counterweighted at one end adjacent to which is the lever fulcrum. The fulcrum is displaceable lengthwise of the lever through a short distance sufficient to cross the center of gravity of the lever. This movement is controlled by a mechanism and the boom lifts automatically under its own weight when the center of gravity is passed. The advantage of such a system is that the effort required to raise the boom is very little and the use of high-torque equipment is unnecessary so that the boom gate can be cheaply made. Ways of displacing the fulcrum using pneumatic pressure, a handle or an electric motor are described. Also a double-sided boom gate is described.
REFERENCES:
patent: 356325 (1887-01-01), Mills
patent: 364470 (1887-06-01), Blake
patent: 690006 (1901-12-01), Anthony
patent: 898487 (1908-09-01), Janier
patent: 1416162 (1922-05-01), Black
patent: 1600745 (1926-09-01), Tickner
patent: 3749342 (1973-07-01), Perrine
patent: 3877174 (1975-04-01), McDonald
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