Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Including sleeve and distinct tapered expander
Patent
1984-05-24
1987-02-10
Holko, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Including sleeve and distinct tapered expander
411 70, 411 71, 411 72, 411334, 411395, 411501, F16B 1306, F16B 3500
Patent
active
046420100
ABSTRACT:
A threaded fastener for installation in threaded engagement with an initially unthreaded apertured workpiece and which after installation can be removed in the manner of a screw or bolt, has a shank and an enlarged head. At least part of the shank intermediate between its ends has an external screw thread having a sharp crest, and can be radially expanded to cause the thread to embed in the workpiece. A bore extends through the head and the entire shank or at least the threaded part of the shank for receiving means for expanding the shank. An end portion of the shank remote from the head may be unthreaded to avoid splitting of the shank during expansion.
The method of installing the fastener involves pulling a tapered mandrel along the bore to expand the shank. The mandrel may have a key-forming head of non-circular cross-section whereby the bore of the fastener can be adopted to receive a key of non-circular cross-section for turning the fastener in the workpiece.
The head of the fastener may be deformable towards the workpiece to clamp another member to the workpiece.
REFERENCES:
patent: 1271408 (1918-07-01), Wood
patent: 1655808 (1928-01-01), Bodkin
patent: 3424212 (1969-01-01), Kemper
patent: 3555673 (1971-01-01), Summerlin
patent: 3880042 (1975-04-01), Binns
patent: 4408938 (1983-10-01), Maguire
patent: 4411570 (1983-10-01), Juric
patent: 4488843 (1984-12-01), Achille
patent: 4507817 (1985-04-01), Staffeld
Alvi Zia R.
Bradley William D.
Lacey Raymond D.
Avdel Limited
Holko Thomas J.
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