Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1986-10-28
1987-10-27
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Assembling or joining
2924352, 2924353, 292835, B21D 3900, B23P 1102
Patent
active
047019930
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 port 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.
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Alvi Zia R.
Bradley William D.
Lacey Raymond D.
Advel Limited
Moon Charlie T.
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