Presses – Automatic or material triggered control
Patent
1979-08-13
1981-07-28
Wilhite, Billy J.
Presses
Automatic or material triggered control
100192, B30B 1526
Patent
active
042804035
ABSTRACT:
Hydraulic "squeeze cylinders" control the size of the discharge orifice on an extrusion baler and are operated by a control circuit that relieves pressure in the cylinders in response to the build-up of a certain predetermined pressure level in the circuit. Pressurized fluid for the squeeze cylinders is supplied by a single-acting pump cylinder that is connected between the plunger head and its pitman rod in such a way as to deliver a charge of pressurized fluid into the circuit on each compression stroke of the plunger. A pilot-operated relief valve is operated by circuit pressure when the latter reaches a predetermined pressure level to block flow from the pump cylinder and open a relief path for fluid in the squeeze cylinders.
REFERENCES:
patent: 2763201 (1956-09-01), Hauswirth
patent: 2796825 (1957-06-01), Kriegbaum et al.
patent: 3121387 (1964-02-01), Fuhrwerk et al.
patent: 4148254 (1979-04-01), Graber et al.
patent: 4166414 (1979-09-01), Fleming et al.
patent: 4168659 (1979-09-01), Yatcilla et al.
The Cessna Aircraft Company
Wilhite Billy J.
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