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Torque-limiting fastening element
| Details |
Inventors: Assmundson, Jarl;
Assignee: Excelsior Development Inc. (Wilmington, DE)
Primary Examiner: Wilson; Neill R.
Assistant Examiner:
Attorney, Agent or Firm: Bednarek; Michael D. Kilpatrick & Cody
The invention relates to a fastening element with a torque-limiting function, comprising on the one hand a fastening member (2, 2') with working threads (4), that is to say threads which are active for the fastening function of the element, and on the other hand a gripping member (3, 3') which is arranged so as to be capable of being turned with the aid of a spanner, wrench, screwdriver or other tool for attaching the fastening element (1, 1') and connected or connectable to the fastening member (2, 2') via a torque-transmitting threaded connection (5, 6/17, 18) with sufficient strength in order to be capable of transmitting to the fastening member torque of the size for which the fastening element is intended, and in which the gripping member is arranged to be unscrewed and turned relative to the fastening member, on attachment of the fastening element, only when the torque exceeds a given predetermined torque. The threads (5, 6/17, 18) in the torque-transmitting threaded connection are threaded in the opposite direction compared with the working threads (4). |
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DETAILED DESCRIPTION I claim: 1.
A threaded torque-limiting fastening element comprising: a fastening screw having spaced apart and oppositely-handed first and second sets of threads provided about an exterior thereof, said fastening screw having a flange portion provided thereon between said first and second sets of threads, said flange-being constructed and arranged to act as a stop to limit axial movement of said fastening screw; and a torque nut threaded onto said second set of threads, said torque nut being tightened onto said second set of threads with a torque sufficient to substantially fix said torque nut relative to said fastening screw, such that a torque for tightening said fastening screw applied to said torque nut causes said torque nut and said fastening screw to rotate in unison, wherein a torque for tightening said fastening screw applied to said torque nut in excess of a threshold torque causes said torque nut to rotate independently from said fastening screw.
2.
A fastening element according to claim 1, wherein said flange portion is constructed and arranged to be gripped by a tool for turning said fastening screw.
3.
A fastening element according to claim 1, wherein said fastening screw is provided with a second flange portion at least adjacent to said second set of threads, said second flange portion being constructed and arranged to restrict axial displacement of said torque nut relative to said fastening screw.
4.
A fastening element according to claim 1, wherein a portion of said fastening screw on which said second set of threads is provided is conically tapered in a direction away from said first set of threads.
5.
A fastening element according to claim 1, wherein a portion of said fastening screw on which said second set of threads is provided is conically divergent in a direction away from said first set of threads.
6.
A fastening element according to claim 1, wherein said first set of threads is right-handedly threaded and said second set of threads is left-handed threaded
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