Motorized over center clamp

Details Motorized over center clamp Motorized over center clamp

1985-08-30

1987-01-13

Watson, Robert C.

Work holders

Relatively movable jaws

Clamp couple element with fastening means

269224, 269226, 269228, B23Q 302

Patent

active

046359117

ABSTRACT:
A motorized over center clamp for clamping parts or work pieces utilizes a sequence controller to drive an electric motor and rotate a worm wheel mounted on a worm wheel shaft. A crank rod assembly is rotationally mounted in an off center position on the worm wheel and has curved closed end track portions that ride on the worm wheel shaft. The crank rod assembly is connected to a piston that moves a clamp rod under spring pressure. When the motor has rotated its shaft to the clamped position of the clamp, rotation of the motor shaft is stopped and the clamp is held in position by the spring forcing a mechanical over center condition of the crank rod assembly relative to the worm wheel shaft. The spring length is sensed to determine energy stored in the spring and detect lack of work pieces, work pieces out of position or work pieces that are oversized.

REFERENCES:
patent: 789906 (1905-05-01), Gordon
patent: 960070 (1910-05-01), Brown
patent: 2162133 (1939-06-01), Spire
patent: 2369362 (1945-02-01), Marziani
patent: 2634639 (1953-04-01), Sowell
patent: 3034778 (1962-05-01), Shaffer et al.
patent: 4470578 (1984-09-01), Arvidsson et al.

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