Means for drilling
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 8, 1985
Issued Date -
N/A
app pub date -
Jun 10, 1983
filing date -
Apr 29, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Drilling means of the type having a pilot bit, a reamer and a guidemember mounted in the bottom end of the casing tube, and which transmits impacts to the casing. The guide member is snugly enclosed in the thickened mouth portion of the casing tube and has a plurality of channels which are segments of a spiral through which the drilling debris is discharged upwardly to the casing tube.
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