Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Helical anchor
Patent
1980-07-18
1982-01-05
Britts, Ramon S.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Helical anchor
411262, F16B 1300
Patent
active
043091350
ABSTRACT:
An improved concrete anchor consists of an expansion nut in the form of a cylindrical coil of a resilient material and a bolt provided with a thread adapted to receive the coil. The thread of the bolt has two sections of different effective minor diameters. A first section immediately adjacent the threaded end of the bolt has a minor diameter sufficiently small to permit the bolt to enter the coil without causing any distortion or enlargement in the outer diameter of the coil. Adjacent the first threaded section and extending toward the head of the bolt is a second section having a larger minor diameter which causes expansion of the coil on engagement therewith. The end of the coil facing away from the head of the bolt is provided with a short, straight tab portion which extends in a direction generally away from the head of the bolt while tapering inwardly toward the axis thereof. The opposite end of the coil is provided with locking means for engaging the wall of the hole in which the anchor assembly is used in order to inhibit rotation of the coil.
REFERENCES:
patent: 977709 (1910-12-01), Craig
patent: 1199624 (1916-09-01), Smith, Jr.
patent: 2649830 (1953-08-01), Arnold
patent: 3945070 (1976-03-01), Hauser
patent: 3983736 (1976-10-01), King, Jr.
Britts Ramon S.
Keystone Consolidated Industries, Inc.
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