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Core drill's bit is replaceable without withdrawal of drill stem - A concept

Author:
Rushing, F. C.
Published:
Sep 1, 1970.
Physical Description:
1 electronic document
Additional Creators:
Simon, A. B.
Online Version

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Restrictions on Access:
Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access
Summary:
Drill bit is divided into several sectors. When collapsed, the outside diameter is forced down the drill stem, when it reaches bottom the sectors are forced outward and form a cutting bit. A dulled bit is retracted by reversal of this procedure.
Other Subject(s):
Collection:
NASA Technical Reports Server (NTRS) Collection.
Note:
Document ID: 19700000377.
Accession ID: 70B10391.
MFS-20819.
Terms of Use and Reproduction:
No Copyright.
View MARC record | catkey: 16208534