Expansion anchor with safety feature

Details Expansion anchor with safety feature Expansion anchor with safety feature

1975-06-27

1976-07-13

Frazier, Roy D.

85 62, 85 72, E04B 141

Patent

active

039687210

ABSTRACT:
An expansion anchor for use in concrete structures includes an anchor sleeve in form of a wire block spring which is to be inserted into an expansion anchor hole. A conically tapering expander member is located at the leading end of this spring, and a bolt extends from the trailing end of the spring to the leading end and is engaged with the expander member which it draws into the spring thereby expanding the latter into engagement with the material surrounding the expansion anchor hole. An abutment is provided on the expander member which engages the leading end of the spring when the expander member has been drawn into the latter, and which shears off when the pull exerted by the bolt exceeds a certain limit, in order to thereby prevent the possibility that the surrounding material of the structure in which the expansion anchor is mounted might become damaged.

REFERENCES:
patent: 768283 (1904-08-01), Jenkins
patent: 1530679 (1925-03-01), Lambert
patent: 1628253 (1927-05-01), Lyddane
patent: 2195029 (1940-03-01), Hathorn
patent: 2372222 (1945-03-01), Mullgardt
patent: 3148578 (1964-09-01), Gapp
patent: 3302509 (1967-02-01), Modrey
patent: 3837257 (1974-09-01), Fischer

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