EP 0516561 B1 19950913 - Hydraulic impact apparatus.
Title (en)
Hydraulic impact apparatus.
Title (de)
Hydraulischer Schlagapparat.
Title (fr)
Appareil hydraulique à percussions.
Publication
Application
Priority
FR 9106693 A 19910530
Abstract (en)
[origin: EP0516561A1] Apparatus comprising a striking piston (1) driven hydraulically in a reciprocating fashion by a non-compressible fluid inside a cylinder, and coming to strike a tool (60), of the type in which the piston slides in a cylinder comprising two concentric piston bearing surfaces of different cross-sections, of which the one situated on the tool side has a smaller cross-section than the one further away from the tool, the piston and the cylinder delimiting two opposing chambers, an annular lower chamber (7) and an upper chamber of larger cross-section. According to the invention, the inside of the upper chamber (3) is permanently at a regulated pressure, of intermediate value between the inlet or high pressure, and the outlet or low pressure, and the annular lower chamber (7) is alternately connected, via a directional control valve (6) to the high-pressure feed circuit during the phase in which the piston (1) rises, and to the upper chamber (3) during the accelerated descent phase of the piston (1). <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP US)
B25D 9/145 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0516561 A1 19921202; EP 0516561 B1 19950913; AT E127717 T1 19950915; AU 1728792 A 19921203; AU 647623 B2 19940324; CA 2069184 A1 19921201; CA 2069184 C 19960227; DE 69204747 D1 19951019; DE 69204747 T2 19960222; DK 0516561 T3 19960129; ES 2077379 T3 19951116; FI 101688 B1 19980814; FI 101688 B 19980814; FI 922483 A0 19920529; FI 922483 A 19921201; FR 2676953 A1 19921204; FR 2676953 B1 19930820; JP 2515206 B2 19960710; JP H05146976 A 19930615; US 5392865 A 19950228; ZA 923479 B 19930127
DOCDB simple family (application)
EP 92420165 A 19920520; AT 92420165 T 19920520; AU 1728792 A 19920529; CA 2069184 A 19920521; DE 69204747 T 19920520; DK 92420165 T 19920520; ES 92420165 T 19920520; FI 922483 A 19920529; FR 9106693 A 19910530; JP 13514292 A 19920527; US 88918992 A 19920528; ZA 923479 A 19920513