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US 4,561,812 AGranted
Extensible drill
OwnerKarl H. Lindeninventor
Life of this patent
Estimating the term…
Abstract
An extensible drill assembly comprising a plurality of separate drill members having different drill diameters which are arranged to permit assembly of two or more of the drill members into a continuous drill combination having a stepwise increasing diameter from the outermost drill member.
Claims8
An extensible drill assembly for drilling holes of different diameters with the same assembly comprising:
- (a) a front drill member;
- (b) a plurality of rear drill members having different drill diameters;
- (c) the front drill member including at least one cutting portion extending peripherally and axially thereof and means for detachably connecting the front drill member to one or more rear drill members;
- (d) each rear drill member including first means for detachably connecting one end thereof to either the front drill member or another rear drill member and second means for detachably connecting the other end thereof to either a drilling machine or another rear drill member, whereby the first and second detachable connection means permit the rear drill members to be connected to each other in any desired number and combination;
- and
- (e) the connected drill members being of stepwise increasing diameters from the front drill member to the last rear drill member.
3 more elements
Dependencies are inferred from the claim text.