Elongated-member-driving apparatus – With means to head member – Heading tool extends within hollow portion of member
Patent
1986-03-05
1987-09-29
Bell, Paul A.
Elongated-member-driving apparatus
With means to head member
Heading tool extends within hollow portion of member
411 21, 411479, 227156, B21J 1504, B21J 1510
Patent
active
046964231
ABSTRACT:
A hollow sheet metal steel fastener for joining wood and/or wood product assemblies subjected to high shear and bending stress loadings. The fastener comprises an elongated, equilateral triangular tubular shaft with continuous stiffening ribs along the centerlines of the three sides to effect and approximate a six pointed star form when viewed in cross section providing a uniquely rigid shaft to withstand lateral shear forces across the transverse section and longitudinal bending stresses. The fastener further comprises three integral, uniquely formed flanges at opposite ends of the shaft with three driving head flanges at one end so formed as to mate with a specially designed driving tool to enable mechanically powered driving, said tool having a rounded, concave driving head as required to resistance drive the fastener into a lesser diameter lead hole in the host materials. The lead point flanges, opposite end, are multi-function and multi-mode for optional, alternative fastener applications, consisting of three V-formed flanges symmetrically formed about the longitudinal shaft centerline to permit initial insertion into the prebored lead hole in the host materials for power driving placement and then, subsequent displacement of the lead point flanges, after driving, in variable configurations to meet variable installed modes.
REFERENCES:
patent: 1304887 (1919-05-01), Kennedy
patent: 2823572 (1958-02-01), Gisondi
patent: 3093178 (1963-06-01), Boyd
patent: 3269251 (1966-08-01), Bass
patent: 3417525 (1968-02-01), Dashio
patent: 4354782 (1982-10-01), Newport
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