Drill guides and apparatus for holding same
OwnerJoseph A. Grabinventor
Life of this patent
Estimating the term…
Abstract
A drill guide apparatus for use in drilling a central bore in a portion of a broken-off bolt remaining in a threaded bore. A clamp tube carries inwardly-directed setscrews for attaching the clamp tube to a stud or bolt located near the broken bolt. An arm extends adjustably through the clamp tube, and setscrews in the clamp tube hold the arm in a desired position relative to the clamp tube. A drill guide holder mountedon the arm includes setscrews which hold an appropriate drill guide tube in position to receive and guide a drill to bore the required hole in the remaining portion of the broken bolt.
Claims12
Guide apparatus for use in boring an axial hole centrally in a broken bolt to permit use of an extractor therein, comprising:
- (a) a guide tube defining a bore of an appropriate size to guide a drill;
- (b) guide tube holder means for holding said guide tube securely in a predetermined location with respect to said guide tube holder means during use of said guide apparatus;
- (c) an arm fixedly attached to said guide tube holder means;
- (d) a clamp slidably disposed on said arm;
- (e) clamp fastening means for adjustably holding said clamp in a predetermined location on said arm;
- and
- (f) means included in said clamp for fixedly attaching said clamp to a protruding object located proximate said broken bolt and for holding said arm extending fixedly in a predetermined direction so as to support said guide tube with said bore thereof aligned coaxially with said broken bolt.
Dependencies are inferred from the claim text.