Method and machine for altering the striking stroke of a percuss

Details Method and machine for altering the striking stroke of a percuss Method and machine for altering the striking stroke of a percuss

1995-11-30

1997-09-23

Nguyen, Hoang

Motors: expansible chamber type

Cyclically operable

Clearance control

91277, 91278, F01L 120, F01L 3100

Patent

active

056692811

ABSTRACT:
Method and apparatus for controlling a percussive machine by determining, during the phase of rebound of a piston following impact, the existence of an instantaneous flow rate of fluid flowing from a top chamber toward the high-pressure fluid feed circuit. The instantaneous flow rate is determined on the basis of the differential pressure between the top chamber and the high pressure fluid feed circuit. If a flow rate is detected, a control device is fed with pressurized fluid so as to shift a selector piston in a direction for lengthening the stroke of the striking piston.

REFERENCES:
patent: 3552269 (1971-01-01), Arnot
patent: 3720137 (1973-03-01), Landherr et al.
patent: 4016941 (1977-04-01), Sanders
patent: 4858702 (1989-08-01), Piras
patent: 4951757 (1990-08-01), Hamada et al.

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