Annular air-hammer apparatus for drilling holes
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United States of America Patent
Stats
-
Feb 2, 1988
Grant Date -
N/A
app pub date -
Aug 5, 1986
filing date -
Aug 6, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The annular air-hammer apparatus for drilling holes comprises a shell hav fitted co-axially therein a chips-receiving sleeve, a hollow cylindrical case, and a ring-shaped hammer capable of reciprocating back and forth. The lower part of the shell accommodates a rock-cutting tool capable of moving axially with at least one blow-off passage formed by at least a single longitudinal groove made on the outer cylindrical surface of the rock-cutting tool. With the rock-cutting tool in its uppermost position, the blow-off passage communicates with an outlet space provided between the shell and the case.
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