EP 0070246 B1 19840822 - HYDRAULIC PERCUSSION DEVICE
Title (en)
HYDRAULIC PERCUSSION DEVICE
Publication
Application
Priority
FR 8114043 A 19810710
Abstract (en)
[origin: EP0070246A1] 1. A percussion apparatus moved by a pressurised fluid, of the type comprising a mobile striking mass (2) in the form of a piston supplying a series of impacts on a tool (3), this piston being slidably mounted in a cylinder (4) which, provided in the body (5) of the apparatus and including ports (6, 7) connected by ducts (8, 9), serves additionally in the sliding of a distributor (10) connecting the chamber (11) situated above the piston alternately to a high pressure circuit (12), for enabling the piston to descend rapidly, and to a low pressure circuit (13) for effecting the return strocke of this piston, characterised in that it comprises, on the one hand, a non-return valve (22) enabling fluid to pass from the chamber (11) located above the strike piston towards the high pressure circuit (12) and, on the other hand, means ensuring that the distributor (10) is displaced sequentially in such a way that, starting from a position in which the chamber (11) located above the piston is connected to the high pressure (12), the distributor is displaced very rapidly as far as a position in which it interrupts the connection between the said chamber and the high pressure, then at a lower, controlled speed, so as to delay the connecting of the chamber (11) to the low pressure circuit (13), so as to enable the maximum amount of restorative energy to be recovered for the entire duration of the isolation of the chamber located above the piston with respect to the high pressure and low pressure circuits, by compressing the fluid isolated in the chamber for the passage of the latter into the high pressure circuit by means of the non-return valve.
IPC 1-7
IPC 8 full level
B25D 9/04 (2006.01); B25D 9/12 (2006.01); B25D 9/14 (2006.01); B25D 9/16 (2006.01); B25D 9/20 (2006.01)
CPC (source: EP)
B25D 9/12 (2013.01); B25D 9/145 (2013.01); B25D 9/20 (2013.01); B25D 2209/002 (2013.01); B25D 2209/005 (2013.01)
Designated contracting state (EPC)
AT BE CH DE GB IT LI LU NL SE
DOCDB simple family (publication)
EP 0070246 A1 19830119; EP 0070246 B1 19840822; AT E9071 T1 19840915; AU 540338 B2 19841115; AU 8577882 A 19830113; BR 8203985 A 19830705; CA 1205353 A 19860603; DE 3260607 D1 19840927; DE 70246 T1 19830511; ES 513330 A0 19830316; ES 8304466 A1 19830316; FI 78857 B 19890630; FI 78857 C 19891010; FI 822439 A0 19820708; FI 822439 L 19830111; FR 2509217 A1 19830114; FR 2509217 B1 19840810; JP S5871081 A 19830427; JP S5912428 B2 19840323; NO 151109 B 19841105; NO 151109 C 19850213; NO 822392 L 19830111; ZA 824781 B 19830427
DOCDB simple family (application)
EP 82420091 A 19820706; AT 82420091 T 19820706; AU 8577882 A 19820709; BR 8203985 A 19820708; CA 406817 A 19820707; DE 3260607 T 19820706; DE 82420091 T 19820706; ES 513330 A 19820622; FI 822439 A 19820708; FR 8114043 A 19810710; JP 11870182 A 19820709; NO 822392 A 19820709; ZA 824781 A 19820705