Hydraulic jack having a small diameter bleed part in the cylinde

Details Hydraulic jack having a small diameter bleed part in the cylinde Hydraulic jack having a small diameter bleed part in the cylinde

1987-07-16

1988-11-15

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Fluid pressure

Vehicle attached

B66F 324

Patent

active

047843713

ABSTRACT:
A hydraulic jack including a bleed port for permitting the flow of fluid from the ram cylinder when the head portion of the ram moves to a position adjacent one end of the cylinder so as to prevent the ram head portion from being forced and the sealing means against the end of the cylinder. The bleed port means comprises a bore formed by a laser beam and extending through the cylinder wall, the bore having a diameter of less than approximately 0.015 inches along substantially its entire length.

REFERENCES:
patent: 1550254 (1925-08-01), Hewey
patent: 1624151 (1927-04-01), Shevein
patent: 2456105 (1948-12-01), Berg
patent: 3685797 (1972-08-01), Orr
patent: 3806091 (1974-04-01), Wride
patent: 3818805 (1974-06-01), Johansson
patent: 3890684 (1975-06-01), Tallman
patent: 3925985 (1975-12-01), Peterson
patent: 4077608 (1978-03-01), Nehrig

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