Screw with groove for self-lock and method and rolling flat die

Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having structure to restrict rotation of threaded – mating... – Comprising a thread lock

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Details

411412, F16B 3930

Patent

active

047640677

ABSTRACT:
A self-locking screw has a longitudinal axis and comprises a thread having an inner radial portion and an outer radial portion, the inner radial portion having a pair of opposite first side faces defining a flank angle of the screw. The outer radial portion has a pair of opposite second side faces extending from the first side faces and first and second outer radial faces extending respectively from the pair of opposite second side faces. The thread has a central buffer groove having two groove side walls, the groove side walls along with the second side faces and the first and second outer radial faces defining two axial spaced elastically deformable thread portions which are elastically deformable such that as the thread is threaded onto a counterpart threaded member, the elastically deformable thread portions are engaged by the counterpart threaded member to cause elastic deformation as the thread portions axially approach one another and reduce the spacing between the thread portions. The inner radial portion of the thread is rigid to retain its initial configuration after having been threaded onto the threaded counterpart, whereby the outer and inner radial portions provide the elasticity and rigidity to obtain a high tightening force while resisting loosening thereof.

REFERENCES:
patent: Re27678 (1973-06-01), Orlomoski
patent: 321214 (1885-06-01), Harvey
patent: 422307 (1890-02-01), Libbey
patent: 2301181 (1942-11-01), Ilsemann
patent: 2787796 (1957-04-01), Rosan
patent: 2788046 (1957-04-01), Rosan
patent: 3813718 (1974-06-01), Kamiya
patent: 3850215 (1974-11-01), Orlomoski
patent: 3882917 (1975-05-01), Orlomoski
patent: 3939512 (1976-02-01), Thurston et al.
patent: 4252168 (1981-02-01), Capuano

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