Gate operator apparatus

Details Gate operator apparatus Gate operator apparatus

1983-01-31

1985-03-12

Staab, Lawrence J.

Machine element or mechanism

Mechanical movements

Oscillating to oscillating

74516, 49339, G05G 104, F16H 2144

Patent

active

045037230

ABSTRACT:
The invention comprises a gate or other load operator which provides non-linear torque/angular velocity characteristics over approximately a ninety degree gate travel range wherein the torque/velocity characteristic is reversed for opening and closing. The mechanism, a dual four-bar linkage with slotted pivots, provides high starting torque and lower running torque regardless of whether the gate or load is opening or closing. The mechanism is not constrained to be located on a particular side of the gate post.

REFERENCES:
patent: 383969 (1888-06-01), McDonald
patent: 484847 (1892-10-01), Clary
patent: 516681 (1894-03-01), Hall
patent: 815914 (1906-03-01), Evans
patent: 2576544 (1951-11-01), Smith
patent: 3296876 (1967-01-01), Fernberg
patent: 3520210 (1970-07-01), Tarrant

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