Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Patent
1992-12-22
1995-01-03
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
411404, 411919, F16B 2300, F16B 3506
Patent
active
053781015
ABSTRACT:
A tamper-proof drive system including a drive tool and a complementary nut or fastener drive head each having a body defining a central axis and a drive portion formed in an end surface of the body about the central axis. The drive portion defines a plurality of symmetrical lobes in a circular array. The lobes are defines by three series of arcuate surface, two of which may be generated from circular or elliptical configurations while the intermediate surface is partially circular.
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Saab 900 Service Manual for Manual Transmissions (1979-1988) p. 432-2.
Allen Clayton A.
Olson Gregory R.
Textron Inc.
Wilson Neill R.
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