Adjustable Means To Retard Or Lock Distributor Motor Patents (Class 91/289)
  • Patent number: 5277098
    Abstract: An on-off valve is provided for a rockdrill which is operable by a hydraulic fluid under pressure and which is controlled by a hydraulically biassed valve. The rockdrill is turned on and off by opening and closing the on-off valve. When the valve is turned off hydraulic pressure from an inlet line and a supply pin line to a valve line of the hydraulically biassed control valve is cut off, thereby eliminating the pressure on the supply pin. This interrupts the operating cycle of the control valve and thereby shuts off the operation of the hydraulic drill. When the on-off valve is opened the hydraulic pressure from the inlet line via the supply pin line is re-established to the valve line and to the supply pin, and the operating cycle of the control valve is re-established.
    Type: Grant
    Filed: June 22, 1992
    Date of Patent: January 11, 1994
    Assignee: Ingersoll-Rand Company
    Inventors: Leland H. Lyon, Thomas J. Mlasgar
  • Patent number: 4785997
    Abstract: An improvement in a hydraulic motor for use with an airless paint sprayer system which includes releasable stop means that lock a spool means within said motor to a surrounding sleeve which stop means signal the end of upper and lower strokes of a reciprocating piston associated with said sleeve. In addition, hydraulic fluid anti shock means are provided to prevent the rupture of outlet filter means.
    Type: Grant
    Filed: November 2, 1987
    Date of Patent: November 22, 1988
    Assignee: Durotech Co.
    Inventors: Miroslav Liska, Anthony Tomsicek
  • Patent number: 4143585
    Abstract: An impact tool is described which is capable of developing percussive forces for rock drilling, pile driving, seismic exploration and other repetitive high force applications. The tool contains a hammer and a valve which may be hydraulically actuated so as to oscillate; repetitively executing forward and return strokes during each cycle of oscillation. The valve is actuated in the forward stroke direction by being engaged by the hammer, and in the return stroke direction by fluid pressure means so as to switch the pressure in a cavity in which both the valve and the hammer are disposed for developing forces on the hammer so as to sustain its oscillation. A fluid filled pocket is provided into which the valve enters as it moves in the forward stroke direction, after having switched the pressure in the cavity. A passage is provided on the hammer which is dimensioned so that fluid in the cavity is either connected to a channel, the cavity, or entrapped in the pocket, depending on the position of the hammer.
    Type: Grant
    Filed: August 5, 1977
    Date of Patent: March 13, 1979
    Assignee: Hydroacoustics, Inc.
    Inventor: Roger L. Selsam
  • Patent number: 4077304
    Abstract: Impact tools are described which are capable of developing percussive forces for rock drilling, seismic exploration and other repetitive high force applications. Each of the tools contains a hammer and a valve which may be hydraulically actuated so as to constitute a hydroacoustic oscillator. The valve is actuated in one direction by being engaged by the hammer and in the other direction by fluid pressure means. The fluid pressure means may be controlled by varying the fluid pressure magnitude which applies forces to the valve to effect the movement thereof so as to control the frequency of oscillation of the hammer (i.e., impact blow frequency). Control may also be provided over the hammer stroke and the blow energy.
    Type: Grant
    Filed: March 15, 1976
    Date of Patent: March 7, 1978
    Assignee: Hydroacoustics Inc.
    Inventor: John V. Bouyoucos
  • Patent number: 4037520
    Abstract: An improved fluid motor having only two moving components, a reciprocatable piston and a fluid actuated valve spool. The piston is supported for linear movement in a piston support bore of a barrel assembly, and is moved in alternating directions by the operation of selected porting of a pressure fluid selectively admitted against differential piston pressure faces. The valve spool is disposed in an inner bore in the piston and is alternately driven in opposing directions by automatically controlled and selective application of fluid pressure. The fluid motor experiences no mechanical impact between the valve spool and the piston.
    Type: Grant
    Filed: August 29, 1975
    Date of Patent: July 26, 1977
    Inventor: Herbert Edward Jakob