Hydraulic oscillatory devices

Details Hydraulic oscillatory devices Hydraulic oscillatory devices

B - Operations, Transporting

25

D

138/40.13

B25D 9/12 (2006.01) B25D 9/14 (2006.01) B25D 9/26 (2006.01) F01L 21/02 (2006.01) F01L 25/06 (2006.01) F01L 27/04 (2006.01) F03C 1/03 (2006.01)

Patent

CA 1062585

ABSTRACT OF THE DISCLOSURE A hydraulically-operated road breaker comprises a casing with a tool mounting and housing an oscillatory piston/striker and cylinder arrangement. A sequence valve mounted in the casing controls pressurisation and exhausting of the piston to produce power and return strokes of the piston. Pilot port means positioned in the cylinder of the device are uncovered, at the end of each return stroke of the piston, to allow a valve- actuating flow of hydraulic fluid through the port means to change over the sequence valve and thereby cause stroke reversal of the piston. Manually-operable stroke selection means provide for adjustment of the position of the piston in the cylinder at which the valve-actuating flow occurs, whereby to vary the piston stroke.

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