Adjustable crankpin throw structure having improved throw...

Details Adjustable crankpin throw structure having improved throw... Adjustable crankpin throw structure having improved throw...

2005-10-11

2005-10-11

Freay, Charles G. (Department: 3746)

Pumps

Inertia-type pumping member or drive means

C417S315000

Reexamination Certificate

active

06953324

ABSTRACT:
A stabilizing structure for a throw adjusting eccentric cam in a two-stage reciprocating compressor is provided. The compressor includes a block that has at least one cylinder with an associated compression chamber and piston, a crankshaft that includes an eccentric crankpin, and a reversible motor for rotating the crankshaft in a forward and a reverse direction. An eccentric, two position cam is rotatably mounted over the crankpin. The cam rotates to and operates at a first position relative to said crankpin when the motor is running in the forward direction and rotates to and operates at a second position relative to said crankpin when the motor is running in the reverse direction. The combined eccentricities of the crankpin and the cam cause the piston to have a first stroke when the motor operates in the forward direction and a second stroke when the motor operates in the reverse direction. There is also provided a control for selectively operating the motor either in the forward direction or in the reverse direction.

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