Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Headed fastener element with nut – washer – securing means or cap – Headed bolt or screw with threads and complementary nut
Patent
1981-03-20
1984-09-18
Hako, Thomas J.
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Headed fastener element with nut, washer, securing means or cap
Headed bolt or screw with threads and complementary nut
29526R, 36134, 411392, 411411, 411429, 411435, 411907, F16B 3714
Patent
active
044720971
ABSTRACT:
Torque limiting clamping and sealing means comprise a cylindrical unthreaded screw-thread engaging clamping member of elastomeric material screwed on a rigid screw threaded member at an interference fit. An annular abutment around the clamping member engages a stop fixed with respect to the rigid member at a predetermined limit of screw induced axial travel to effect said limit of travel. A thin, flexible annular sealing lip around the clamping member and spaced radially from the abutment sealingly engages a surface fixed with respect to the rigid member prior to said limit of axial travel.
The interference fit, the pitch and dimensions of the screw thread, and the physical characteristics of the elastomeric material are preselected to enable deformation of the elastomeric material resiliently within its elastic limit into the thread groove of the rigid member to accommodate the interference fit and to cause screw induced relative axial movement of the members to said limit of axial travel, whereupon the elastomeric material flows resiliently within its elastic limit axially across the screw thread to terminate the axial travel and to effect the application of a predetermined maximum allowable torque on the rigid member and a resilient reaction against its screw thread which results in an axial clamping force and a radial thread-locking force against the thread predetermined by said maximum allowable torque.
Upon unscrewing of the members from each other, the elastomeric material returns essentially to its initial undeformed condition for reuse.
REFERENCES:
patent: 3030997 (1962-04-01), Collins
patent: 3273441 (1966-09-01), Biesecker
patent: 4092896 (1978-06-01), Puchy
patent: 4114506 (1978-09-01), Aimar
Kiefer Henry
Wisner Terrance H.
Farathane, Inc.
Hako Thomas J.
Taylor Jay C.
Waldrop Neal A.
Wilson Neill
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