Multiple stage hydraulic jack for use with telescopic jib

Details Multiple stage hydraulic jack for use with telescopic jib Multiple stage hydraulic jack for use with telescopic jib

1991-03-05

1992-05-12

Look, Edward K.

Motors: expansible chamber type

Extension of unit having separately controlled working...

Vane

91173, 91530, 91535, 92 66, F15B 1118

Patent

active

051117339

ABSTRACT:
This invention relates to a multiple jack incorporating at least three elements, viz. two pistons and two cylinders which define large and small chambers of a first cylinder, and large and small chambers of a second cylinder.
According to the invention: a) a first inner conduit connects the large chamber of the first cylinder to a first outer conduit; b) a second inner conduit connects the small chamber of the first cylinder to a second outer conduit; c) a third inner conduit connects the large chamber of the second cylinder to a third outer conduit; and d) a fourth inner conduit connects the small chamber of the second cylinder to a fourth outer conduit.
One application is the production of a telescopic jib presenting a satisfactory flexibility of use.

REFERENCES:
patent: 3603207 (1971-09-01), Parrett
patent: 3610100 (1971-10-01), Hoffman
patent: 3904416 (1975-09-01), Onoda et al.
patent: 3949650 (1976-04-01), Blatt et al.
patent: 4741246 (1988-05-01), Padarev

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