Tool driving or impacting – With indicating or signaling means
Patent
1977-03-11
1978-07-18
Purser, Ernest R.
Tool driving or impacting
With indicating or signaling means
173 32, 175171, E21B 1102
Patent
active
041009720
ABSTRACT:
Apparatus for sinking a borehole in the ground comprises a self-propelled displacement hammer having a tubular housing containing a percussion mechanism for driving the housing forwards, a follow-up tube arranged to be attached to the rear end of the housing and a bracing cable device arranged to be mounted on the rear end of the follow-up tube for exerting a push on the tube from a bracing cable. Preferably the bracing cable device includes a cable guide sheave which is journalled on a bearing piece at the rear end of the tube and the bearing piece also carries a clamping device for clamping a pulling rope, which in operation of the apparatus has one end fixed to the rear end of the housing and which extends upwards through the follow-up tube for withdrawing the hammer upwards through the follow-up tube from the borehole.
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