Expansion shield for anchoring a screw or a bolt in a hole in ma

Details Expansion shield for anchoring a screw or a bolt in a hole in ma Expansion shield for anchoring a screw or a bolt in a hole in ma

1975-02-25

1979-05-15

Britts, Ramon S.

29227, F16B 1304

Patent

active

041541405

ABSTRACT:
An expansion shield for anchoring a machine screw or bolt in a hole in masonry, concrete or stone comprises a strip-like blank of sheet helically wound around a shaft. One turn of the shield overlaps a previous turn. The blank in one end has an inwardly bent engagement portion. A method of producing such an expansion shield comprises winding with overlap a strip-like blank of sheet to helical shape on a rotatable and axially displaceable winding shaft which forms an acute angle with the feeding direction of the blank. A tool or an apparatus for producing the shield is also disclosed.

REFERENCES:
patent: 1005630 (1911-10-01), Fleming
patent: 2842999 (1958-07-01), Huston
patent: 3136202 (1964-06-01), Wagner

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