Expansion dowel assembly

Details Expansion dowel assembly Expansion dowel assembly

1977-11-22

1979-09-18

McCall, James T.

85 72, F16B 3100, F16B 3304

Patent

active

041678869

ABSTRACT:
In an expansion dowel assembly, a stud or bolt extends through an expansion sleeve with an expanding body on one end for radially spreading the sleeve and a head or first working part on the other end for applying torque. A second working part encloses the first working part and is attached to it by one or more shear members. Torque for anchoring the sleeve in a borehole is applied through the second working part to the first working part and the stud. When a preset torque is reached, the shear members break and the second working part can move relative to the first working part without transmitting torque to the stud. A separating member is provided between the first and second working parts and after the preset torque is attained, further torque can not be applied to the stud until the separating member is removed. Preferably, the separating member consists of a flange with outstanding fingers which are in contact with the surface of the first working part against which a torque applying tool is placed. Removal of the fingers is necessary before torque can be applied to the first working part.

REFERENCES:
patent: 3267792 (1966-08-01), Yackle
patent: 3352194 (1967-11-01), Kausen
patent: 3434379 (1969-03-01), Wing
patent: 3602976 (1971-09-01), Grube
patent: 3728933 (1973-04-01), Grube
patent: 3929054 (1975-12-01), Gutshall
patent: 3978761 (1976-09-01), Sosinski

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