Pumps – Condition responsive control of pump drive motor – By controlling drive motor motive fluid
Patent
1974-11-20
1976-09-21
Freeh, William L.
Pumps
Condition responsive control of pump drive motor
By controlling drive motor motive fluid
417339, 417344, 417346, 91392, F04B 4900, F04B 1700, F04B 3500
Patent
active
039816222
ABSTRACT:
An intensifier unit includes a pair of sequentially operated reciprocating ram assemblies, each powered by a cylinder motor. Extension of the cylinder rods is accomplished by application of pressurized hydraulic fluid to the pistons. The pistons are returned quicker than they are extended by means of continuous application of pressurized air to the back side of the pistons. The cylinder motors are precompressed prior to their respective forward strokes by means of an accumulator which continuously bleeds from the main hydraulic fluid supply line. Circuitry is provided to insure that precompression continues even if the ram and its driving piston move from their retracted position. Also disclosed is a safety interlock to shut down the intensifier if both cylinder rods become accidentally simultaneously extended.
REFERENCES:
patent: 2141731 (1938-12-01), Wolfrom et al.
patent: 2660955 (1953-12-01), Kent et al.
patent: 3331329 (1967-07-01), Bauer
patent: 3477380 (1969-11-01), Johanson et al.
patent: 3773438 (1973-11-01), Hall et al.
patent: 3847511 (1974-11-01), Cole
Hall Richard W.
Sonnenberg Sven
Freeh William L.
Kelsey-Hayes Company
LaPointe G. P.
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