Motors: expansible chamber type – Cyclically operable – Distributor forms traversed movable portion of working...
Patent
1977-08-05
1979-03-13
Maslousky, Paul E.
Motors: expansible chamber type
Cyclically operable
Distributor forms traversed movable portion of working...
91284, 91289, 91303, 91319, 91321, 91328, F01B 718, F01L 1700, F01L 2506
Patent
active
041435850
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. A control valve in the channel determines the flow through the channel, and thus the displacement of the valve into the pocket. The displacement is maintained until communication between the pocket and the cavity is provided via the passage. Control is thereby provided over the stroke of the valve and the period between switching of the pressure in the cavity. The hammer stroke length and the frequency and energy of the impacts delivered by the hammer are dependent upon the switching period, and may be varied by the use of the control valve.
REFERENCES:
patent: 795003 (1905-07-01), Petling
patent: 1058919 (1913-04-01), Stoner
patent: 1090417 (1914-03-01), Schmidt
patent: 2609791 (1952-09-01), Bohlmon
patent: 4022108 (1977-05-01), Juvonen
Hydroacoustics Inc.
Lukacher Martin
Maslousky Paul E.
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