Patent ID: 9469961
Filing Date: 2016-10-18
CPC Classification: E02D,E21B

Claim Text:
1. An apparatus for pile-driving or drilling comprising: (a) at least one first hydraulic drive comprising a hydraulic drilling drive or a hydraulic vibration drive for operating at least one second drive or work device; (b) a control block connected with the at least one first hydraulic drive in an open hydraulic circuit; (c) a pump connected with the at least one first hydraulic drive by way of a first feed line and directly connected with the at least one first hydraulic drive by way of a second feed line; (d) a tank connected with the at least one first hydraulic drive by way of a first return line and directly connected with the at least one first hydraulic drive by way of a second return line; and (e) a block blocking at least one of the second feed line directly connecting the pump with the at least one first hydraulic drive and the second return line directly connecting the at least one first hydraulic drive with the tank, wherein in a blocked state of at least one of the second feed line and the second return line, the control block represents a sole connection between the pump and the at least one first hydraulic drive.