Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Torque responsive nut or bolt driving connection – Frangible connection
Patent
1991-07-29
1992-06-09
Wilson, Neill R.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Torque responsive nut or bolt driving connection
Frangible connection
411910, F16B 3100, F16B 3304
Patent
active
051201682
ABSTRACT:
A fastener, such as a machine screw or bolt, designed with a double head, one located above the other, which when tightened by means of the upper head will, when tightened to a specifically desired amount of inch or foot pounds of torqure, over the amount of torque required to apply the main part of the fastener to the desired degree of tightness will shear the upper head from the lower head, automatically torquing no more than desired. The lower head has a conical shape so as to provide a minimum surface to preclude removal by gripping with pliers, a wrench, or screwdriver. This is effected by having the angle between the surface of the cone and the base of the cone advantageously no more than 35.degree., preferably no more than 30.degree. or less. This ultimately provides a tamper-proof fastener with total automatic torquing capabilities.
REFERENCES:
patent: 1243799 (1917-10-01), Bissell
patent: 4225165 (1980-09-01), Kesselman
Monacelli Walter J.
Wilson Neill R.
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