Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent
1992-05-28
1995-02-28
Jones, Eugenia
Tool driving or impacting
Drive controlled by relative axial movement of tool
Drive motor controlled
173137, 173138, 173207, 173208, 173204, 91290, 91303, B23Q 500
Patent
active
053928652
ABSTRACT:
Apparatus comprising a striking piston driven hydraulically in a reciprocating fashion by an incompressible fluid inside a cylinder and striking against a tool, of the type in which the piston slides in a cylinder having two concentric piston bearing surfaces of different sections, of which that situated on the tool side has a section smaller than that remote from the tool, the piston and the cylinder delimiting two antagonistic chambers, an annular bottom chamber and a top chamber of larger section.
According to the invention the interior of the top chamber is permanently at a regulated pressure of a value intermediate between the inlet or high pressure and the outlet or low pressure, and the annular bottom chamber is connected alternately by a distributor to the high pressure supply circuit during the upward phase of the piston and to the top chamber during the accelerated downward phase of the piston.
REFERENCES:
patent: 3830463 (1974-08-01), Klessig
patent: 3887019 (1975-06-01), Reynolds et al.
patent: 3965799 (1976-06-01), Juvonen et al.
patent: 4474248 (1984-10-01), Musso
patent: 4635531 (1987-01-01), Rode
patent: 4800797 (1989-01-01), Comarmond
Etablissements Montabert
Jones Eugenia
Schrock Allan M.
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