Shaft bearing in a rock and ground-drilling machine
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United States of America Patent
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-
Aug 18, 1998
Grant Date -
N/A
app pub date -
Jun 7, 1996
filing date -
Dec 10, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A rock or ground-drilling machine includes a gear housing (14) in which there is journalled a shaft (31) which surrounds a drill string (23) in the manner of a sleeve and which is affixed to the drill string by means of a chuck (7) connected to the shaft (31). the chuck is operated by means of pressure fluid delivered to the chuck (27) through the medium of a commutator (36) acting between the gear housing (14) and the shaft (31). the shaft (31) is journalled in the gear housing (14) by means of one single rolling bearing (39). the commutator (36) lies resiliently against the gear housing (14) and is flexible in response to sideways movement of the shaft (31).
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