Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1986-01-08
1987-03-10
Ridgill, Jr., James L.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
52705, F16B 1306
Patent
active
046487670
ABSTRACT:
A fastening element is insertable into a hole of a structure for fastening an object to the structure and has a shaft having a forward smaller cross-sectional thickness portion, an expandable sleeve fitted over the smaller shaft portion, a holding member for holding the object at the rear end of the shaft and an expanding member for expanding the sleeve at the forward end of the shaft. The expandable sleeve is resilient and elastically deformable radially, has an external diameter larger than the maximum thickness of the shaft and has an internal diameter larger than the cross-sectional thickness of the portion of the shaft over which it is fitted. When inserted, the expandable sleeve is secured elastically against the internal wall of the drilled hole and if a tensile force is applied, the sleeve is pressed against the internal wall by the expanding member. The resilient force of the expandable sleeve enables the sleeve to adapt itself to different drilled hole diameters within the range of drilled hole tolerances. The expandable sleeve can even adapt itself to subsequent changes in the drilled hole, such as those resulting from the formation of cracks.
REFERENCES:
patent: 806407 (1905-12-01), Farrington
patent: 3014398 (1961-12-01), Engle
patent: 3921496 (1975-11-01), Helderman
Ridgill, Jr. James L.
Striker Michael J.
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