The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 1991
Filed:
Dec. 10, 1990
Dan E Crawford, Charles City, IA (US);
Douglas A Rogge, Charles City, IA (US);
Diversified Fastening Systems, Inc., Charles City, IA (US);
Abstract
A tool adapted for use with a drill for installing screw anchors in concrete or masonry walls or the like having a sleeve type body, a bit holder slidably located in the body, a drill bit with a handle secured in the bit holder, a coil spring seated on a collar of the bit holder and extending around the bit, a nut driver secured to the front end of the body, a set screw to retain the drill bit in the bit holder and also to serve as a means to advance and retract the drill bit, and a cutout comprised of a longitudinal slot, a retainer notch and at least one depth notch. The longitudinal slot is adjoined by both the retainer notch and the depth notch through the use of curved sidewalls which allow the tool operator to use a smooth, uniform, and efficient motion to adjust extension of the drill bit.