Motors: expansible chamber type – Cyclically operable – Distributor forms traversed movable portion of working...
Patent
1975-04-16
1977-05-10
Maslousky, Paul E.
Motors: expansible chamber type
Cyclically operable
Distributor forms traversed movable portion of working...
91303, 91319, 91321, 91328, F01B 718, F01L 2506
Patent
active
040221083
ABSTRACT:
A hydraulically operated percussion apparatus comprising a housing in which a reciprocating impact piston is arranged to transfer impact energy to an impact tool, pressure chambers defined between said housing and said piston, and a channel system including a high pressure and a low pressure branch for conducting hydraulic pressure fluid to and from the pressure chambers, a first one of said chambers containing a movable distribution valve member responsive to the movements of the piston for alternately connecting said first chamber to said high pressure branch and said low pressure branch, respectively, characterized in that said valve member is arranged to be transported by the piston when moving in one direction, and responsive to the movement of the piston in the other direction to be acted upon by the pressure fluid to move in said other direction by means of hydrostatic pressure, said valve member having a longer path of movement than the impact piston and being arranged, at its movement in said one direction, and by virtue of its kinetic energy, to continue its movement and open said first pressure chamber towards said high pressure branch and close it towards said low pressure branch, when the piston hits said tool.
REFERENCES:
patent: 3766830 (1973-10-01), Montabert
patent: 3774502 (1973-11-01), Arndt
patent: 3896889 (1975-07-01), Bouyoucos
patent: 3925985 (1975-12-01), Peterson
Linden-Alimak AB
Maslousky Paul E.
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