1977-06-28
1978-08-22
McCall, James T.
F16B 1306
Patent
active
041080432
ABSTRACT:
An anchorage appliance comprising a bolt having a head and a threaded stem, a nut on said stem, a metal sleeve permanently associated with the nut and encircling the stem, an annular body of elastomeric material, for example rubber, mounted on the sleeve, a metal collar telescoping over the sleeve. The elastomeric body is subjectible to axial compressive force between annular abutment surfaces on the nut and on the collar when the nut moves up the threaded stem towards the bolt head. The nut, the collar and the elastomeric body when unstressed together have external cylindrical surfaces of similar diameter except that the elastomeric body is formed integrally with at least one narrow outwardly projecting annular flexible flange. The flange has an overall diameter which is 7 to 15% larger than that of the collar, the nut and the elastomeric sleeve when the latter is in unstressed condition, all whereby the appliance can be satisfactorily used when inserted in a preformed hole having a diameter up to 10% greater than the diameter of the nut, the sleeve and the collar.
McCall James T.
Resilient Grip Limited
LandOfFree
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