Method of using an extensible boom mechanism for use with cable

Details Method of using an extensible boom mechanism for use with cable Method of using an extensible boom mechanism for use with cable

1992-08-14

1993-08-03

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Method or apparatus for placement of conductive wire

Conduit snakes

B23Q 308

Patent

active

052322050

ABSTRACT:
A method of using an extensible mechanism, in which a first hydraulic cylinder and piston has a fixed reference for movement in an extension direction and also in a retraction direction. A second hydraulic cylinder and piston is moveable in both of these directions. Hydraulic fluid actuates the first and second hydraulic units in series, whereby actuation in the extension direction sequentially moves the first and second hydraulic piston and actuation in the retraction direction reverses the sequential order of movement of the two hydraulic pistons.

REFERENCES:
patent: 2731233 (1956-01-01), Lindsay
patent: 3226088 (1965-12-01), Habighorst
patent: 3244292 (1966-04-01), Elliott
patent: 3348811 (1967-10-01), Pierce
patent: 4095326 (1978-06-01), Harvey
patent: 4468003 (1984-08-01), Nonclercq et al.
patent: 4469306 (1984-09-01), Wimer et al.
patent: 4609180 (1986-09-01), Fisher et al.

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