EP 0472982 B1 19951213 - Hydraulically operated impact drilling device, especially for boltdrilling
Title (en)
Hydraulically operated impact drilling device, especially for boltdrilling
Title (de)
Hydraulisch betriebene Schlagdrehbohrvorrichtung, insbesondere zum Ankerlochbohren
Title (fr)
Appareil de forage tournant et frappant actionné hydrauliquement, spécialement pour le forage d'ancrage
Publication
Application
Priority
DE 4027021 A 19900827
Abstract (en)
[origin: EP0472982A2] In order to prevent overstressing of the transmission elements (drill sleeve and insertion end) when using percussion drilling devices, especially for drilling anchor holes, it is proposed to equip the pressure line (24) for the supply of the drive medium to the percussion piston (3) with a first control member (25) which reduces the working pressure driving the percussion piston - after a limit value of the rotary-mechanism working pressure is exceeded - as the latter rises. In addition, there is a second control member (42), via which the push-out pressure against which the percussion piston (3) can be returned counter to the percussion direction (arrow 21) can be changed, after a limit value has been exceeded, as a function of the size of one of the working pressures - namely of the percussion-mechanism or rotary-mechanism working pressure - in such a way that the size of the push-out pressure increases or decreases with increasing working pressure. <IMAGE>
IPC 1-7
IPC 8 full level
B25D 9/14 (2006.01); B25D 9/26 (2006.01); B25D 17/10 (2006.01); E21B 1/26 (2006.01); E21B 44/06 (2006.01)
CPC (source: EP US)
B25D 9/145 (2013.01 - EP US); B25D 9/26 (2013.01 - EP US); E21B 44/06 (2013.01 - EP US)
Designated contracting state (EPC)
AT CH DE FR GB IT LI
DOCDB simple family (publication)
EP 0472982 A2 19920304; EP 0472982 A3 19920408; EP 0472982 B1 19951213; AT E131430 T1 19951215; DE 4027021 A1 19920305; DE 59107065 D1 19960125; JP H05131379 A 19930528; US 5117921 A 19920602
DOCDB simple family (application)
EP 91113401 A 19910809; AT 91113401 T 19910809; DE 4027021 A 19900827; DE 59107065 T 19910809; JP 21181191 A 19910823; US 75027091 A 19910827