Extracting screw apparatus

Details Extracting screw apparatus Extracting screw apparatus

1983-03-01

1985-09-03

Jordan, Charles T.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91519, 91534, 60425, F15B 1102

Patent

active

045385050

ABSTRACT:
An extracting screw apparatus comprises a hydraulic control which operates during starting of the extracting screw after a period of nonuse. The hydraulic control comprises a double-acting hydraulic actuator having a piston rod connected to an intermittent drive such as an overrunning clutch for rotating a driving shaft for the extracting screw about its axis. The intermittent drive converts linear reciprocating movement transmitted by the hydraulic actuator into intermittent angular movement. A hydraulic motor alone insures rotation of the extracting screw about its axis after starting and also insures the sweep movement of the extracting screw about a vertical axis. A hydraulic control circuit connected between a line running from a pump to the hydraulic motor for cutting off hydraulic fluid to the double-acting hydraulic actuator after normal operating torque is reached.

REFERENCES:
patent: 2961015 (1960-11-01), Randall
patent: 4226166 (1980-10-01), Frank

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