US 12,134,937 B2
Impact piston device for a impact drill drive
Markus Merzhäuser, Drolshagen (DE)
Assigned to EURODRILL GmbH, Drolshagen (DE)
Filed by EURODRILL GmbH, Drolshagen (DE)
Filed on Apr. 10, 2023, as Appl. No. 18/297,756.
Claims priority of application No. 22 171 590 (EP), filed on May 4, 2022.
Prior Publication US 2023/0358099 A1, Nov. 9, 2023
Int. Cl. E21B 1/26 (2006.01)
CPC E21B 1/26 (2020.05) 9 Claims
OG exemplary drawing
 
1. An impact piston device for an impact drill drive, comprising
an impact piston, which is movably mounted in a piston housing so as to be reversible between a front striking position and a rear retracted position, the impact piston having at least one front pressurizing surface and at least one rear pressurizing surface, at least one front pressure chamber and a rear pressure chamber being formed together with the piston housing,
a hydraulic fluid feed,
a hydraulic fluid drain,
a first control device, via which at least the rear pressure chamber for effecting the reversing movement of the impact piston is connected alternately to the hydraulic fluid feed and the hydraulic fluid drain, and
a second control device, with which at least one stroke path of the impact piston within the piston housing can be adjusted,
the first control device having an actuatable first control valve and the second control device having an actuatable second control valve,
wherein
the first control valve and second control valve are arranged in a common valve housing,
the valve housing comprises a valve block in which the fluid lines and the valve receptacles are formed, in particular milled in, and
a cover plate is provided, with which the valve block containing the fluid lines and the valve receptacles is closed.