EP 0785845 B1 19990630 - VALVE ARRANGEMENT IN A HYDRAULIC PERCUSSIVE ROCK DRILL
Title (en)
VALVE ARRANGEMENT IN A HYDRAULIC PERCUSSIVE ROCK DRILL
Title (de)
VENTILANORDNUNG FÜR EIN HYDRAULISCHES GESTEINS-SCHLAGBOHRWERKZEUG
Title (fr)
AGENCEMENT DE SOUPAPE POUR MARTEAUX-FOREURS HYDRAULIQUES POUR ROCHES
Publication
Application
Priority
- GB 9502453 W 19951017
- ZA 948118 A 19941017
Abstract (en)
[origin: WO9611775A1] The invention provides a valve arrangement for use in a hydraulic percussive rock drill (10) wherein a piston (18), located in a cylinder (12, 14), is caused to reciprocate by hydraulic fluid flow, the valve arrangement including a valve (24) controlling the said hydraulic fluid flow, the valve being positioned between opposing first and second surfaces (26A, 32A) of two walls (26, 32) in which are formed at least first and second ports (28, 34) respectively, the valve having at least a third port (38) which is movable into register, and out of register, with the first and second ports, and having first and second hydraulic fluid sealing surfaces (24A, 24B) which respectively engage with the said first and second surfaces (26A, 32A) at least when the third port (38) is out of register with the first and second ports (28, 34); and a hydraulic rock drill (10) having an above-mentioned valve arrangement.
IPC 1-7
IPC 8 full level
B25D 9/14 (2006.01); E21B 1/00 (2006.01); E21B 1/26 (2006.01)
CPC (source: EP)
B25D 9/145 (2013.01)
Designated contracting state (EPC)
AT DE ES FR GB IE IT PT SE
DOCDB simple family (publication)
WO 9611775 A1 19960425; AT E181691 T1 19990715; AU 3659595 A 19960506; AU 686021 B2 19980129; CA 2202521 A1 19960425; CA 2202521 C 20010424; DE 69510557 D1 19990805; EP 0785845 A1 19970730; EP 0785845 B1 19990630; JP H10509382 A 19980914; ZA 948118 B 19960325
DOCDB simple family (application)
GB 9502453 W 19951017; AT 95934224 T 19951017; AU 3659595 A 19951017; CA 2202521 A 19951017; DE 69510557 T 19951017; EP 95934224 A 19951017; JP 51304896 A 19951017; ZA 948118 A 19941017