Heavy duty fastener and method of manufacturing same

Details Heavy duty fastener and method of manufacturing same Heavy duty fastener and method of manufacturing same

1974-02-04

1976-03-23

Parsons, Jr., Marion

85 21, F16B 1506

Patent

active

039452930

ABSTRACT:
A heavy duty fastener is provided especially suitable for outdoor uses such as in heavy timber including utility poles. For example, it may be in the form of a staple for securing a telephone ground wire cover to a pole. It has along each leg or prong a series of longitudinally spaced interlock notches for engagement therein of the severed bent-in edges of growth rings of the timber member in which the fastener is secured, the notches having shoulders facing generally toward and interlocked with the severed edges which thoroughly resist withdrawal of the fastener from the wood member.
Tearing of the fiber structure of the wood during driving in of the fastener is minimized by having all laterally projecting surfaces along the prongs smoothly rounded, including shoulder lips and lateral side shoulder projections generally aligned with the notches.
Manufacture of the fastener by coining of the interlock notches is facilitated. The interlock notches are formed in preferably square rod or wire stock between complementary dies contoured to indent the notches in opposite sides of the fastener prongs, shape arched sloping walls and shoulders in the notches, displace material from the notches to provide the shoulder lips and shoulder projections, and coin harden the material along the prongs.

REFERENCES:
patent: 2182 (1841-07-01), Ballard
patent: 106010 (1870-08-01), Wickersham
patent: 1264683 (1918-04-01), Ricci
patent: 1808197 (1931-06-01), Woodruff
patent: 2202896 (1940-06-01), Buchner et al.
patent: 2613570 (1952-10-01), Sokolik
patent: 2759389 (1956-08-01), Corckran
patent: 2867807 (1959-01-01), Anstett

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