Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Thread or shank structure
Patent
1992-07-02
1993-05-18
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Thread or shank structure
411386, 411304, F16B 3504, F16B 3934
Patent
active
052115208
ABSTRACT:
A threaded fastener in the form of a bolt or screw for recutting damaged threads during installation in a previously threaded bore or for cutting threads in a non-threaded bore. The fastener comprises a threaded shank terminating in a headed end and in a non-threaded frustro-conical lead-in end. A cavity is formed in the shank extending longitudinally from the first shank thread adjacent the frustro-conical lead-in shank end toward the headed shank end. The cavity comprises a slot of obround peripheral configuration having a planar bottom and a depth greater than the depth of the shank threads. At the end of the slot, nearest the lead-in end of the fastener, a radial bore is provided in the shank having a depth up to the longitudinal axis of the fastener shaft and a diameter equal to the diameter of the curved end of the obround slot. The trailing longitudinal edge of the slot comprises a thread cutting edge. The cavity comprises a collecting, retaining, and compacting recess for metal cuttings, from which the cuttings cannot escape.
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patent: 3492908 (1970-02-01), Thurston
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