发明名称 Method and apparatus for controlling a ramming device
摘要 A method is specified for reversing a compressed air-driven ramming device for its control positions of forward running and rearward running in the earth, wherein, for reversal, a turning is performed against a relatively small detaining force and the force of the operational compressed air is used for locking the control device in the individual control positions and for damping the vibration propagation from a ram housing to the control device. As a result, a reversing of the ramming device during the admission of operational compressed air is reliably prevented.
申请公布号 US5307883(A) 申请公布日期 1994.05.03
申请号 US19920973678 申请日期 1992.11.09
申请人 TERRA AG 发明人 JENNE, DIETMAR
分类号 E21B4/14;(IPC1-7):E21B11/02 主分类号 E21B4/14
代理机构 代理人
主权项
地址