Helical anchor

Details Helical anchor Helical anchor

1977-09-29

1980-01-01

Frazier, Roy D.

85 72, F16B 1306

Patent

active

041810600

ABSTRACT:
A helical anchor of the type in which a helical coil surrounds a connecting bolt in attachment with a nut element. Rotation of the connecting bolt causes the coil to expand radially outwardly into gripping engagement with a side wall into which the anchor is received. The end turn of the coil is welded to the nut element. A generally annular notch is provided at approximately the heat affected zone of the weld. The weld is fracturable. Upon take-up of the anchor a break in the weld occurs after which time the notch advantageously provides for outward expansion of the end turn of the coil.

REFERENCES:
patent: 2690693 (1954-10-01), Campbell
patent: 3175284 (1965-03-01), Cotousky
patent: 3295613 (1967-01-01), Anderson
patent: 3683740 (1972-08-01), Martin
patent: 3881393 (1975-05-01), Campbell
patent: 3898907 (1975-08-01), Fischer

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