F - Mech Eng,Light,Heat,Weapons – 16 – B
Patent
F - Mech Eng,Light,Heat,Weapons
16
B
85/106
F16B 25/00 (2006.01) F16B 13/02 (2006.01)
Patent
CA 1204310
CONCRETE SCREW ANCHOR ABSTRACT OF THE DISCLOSURE Disclosed is a screw-type anchor for retention in a bore of predetermined diameter formed in a masonry type support surface. The anchor includes an axially extending shank with an enlarged head portion at one extremity and a bore entering portion at the opposite extremity. The head portion includes rotation inducing surfaces, and a spaced, heli- cal, continuous thread having a predetermined number of threads per inch and predetermined crest diameter formed on the shank and extending from the entering portion towards the enlarged head portion for a substantial portion of the length of the shank. The helical thread has a V-shaped cross-sectional configuration with the flanks of the thread intersecting at an included angle in the range of approxi- mately 50°-65°. The helical thread extends about the shank at a lead angle in the range of approximately 6° to 8-1/2°, wherein the anchor can be threadingly inserted in the bore by cutting mating threads in the wall of the bore at an acceptable insertion torque level while optimizing the pull-out strength of the anchor in the support surface. The invention also includes the method of securing the screw-type anchor in prepared bores in masonry structures by rotatingly inserting the inventive anchor into the bore at a maximum specified rotational speed and with a minimum torque level.
417544
Illinois Tool Works Inc.
Meredith & Finlayson
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