Self-latching eccentric cam for dual stroke compressor or pump

Details Self-latching eccentric cam for dual stroke compressor or pump Self-latching eccentric cam for dual stroke compressor or pump

1982-11-02

1985-01-22

Freeh, William L.

Expansible chamber devices

Displacement control of plural cylinders arranged in...

Stroke of one working member adjustable relative to another

417534, 74571R, 417315, F15B 1564, F16H 5304, F04B 3900

Patent

active

044944470

ABSTRACT:
For a dual capacity refrigerant compressor of the type which has an eccentric cam rotatable on a crankpin between two opposite positions which changes the total eccentricity of the crankpin and cam so as to obtain two different stroke lengths, the rotation of the cam on the crankpin being effected by a reversal of motor operation, the cam moves through an angle of about 270.degree. around the crankpin so that a centrifugal force torque tending to hold the cam in place is available at least in the reduced stroke length position of the cam, and by providing lightening cavities and eccentric weightings, the center of mass 74 of the cam can be shifted to obtain the centrifugal torque in the proper direction at both the maximum and reduced stroke positions.

REFERENCES:
patent: 3010339 (1961-11-01), Brock
patent: 4143995 (1979-03-01), Divisi
patent: 4236874 (1980-12-01), Sisk

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