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MECHANISM FOR SECURING A NUT AGAINST LOOSENING

  • US 3,851,690 A
  • Filed: 09/24/1973
  • Issued: 12/03/1974
  • Est. Priority Date: 09/24/1973
  • Status: Expired due to Term
First Claim
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1. Mechanism for locking a nut on a threaded spindle having a central longitudinal axis, comprising:

  • a washer having a hub portion adapted to fit over said spindle and a peripheral portion providing an annular recess having a base, between the peripheral and hub portions, and having a plurality of first serrations extending radially outward from said hub portion toward said peripheral portion;

    means for keying said washer to said spindle so that the washer cannot rotate but can slide axially relative to said spindle;

    an annular ring member at least partially within said annular recess providing an annular region between the annular ring member and the base of the annular recess, said ring member having a plurality of second serrations extending radially inward therefrom and matching and engaging said first serrations;

    a resiliently strainable ring whose diameter can be enlarged and contracted, within said annular region;

    a threaded nut adapted to thread on the threaded spindle and to abut the washer, and containing a plurality of third serrations extending radially outward and adapted to engage said second serrations;

    said annular recess having a side portion which slants in a direction away from the axis toward its base, and said resiliently strainable ring when unstrained being located at a position of said side portion remote from the base so that when pressure is applied to the annular ring member in the direction of the base of the recess, the annular ring member moves axially toward said base to disengage its serrations from the serrations of the nut, and at the same time the strainable ring is moved toward said base along said slanting side portion and its diameter is resiliently altered, whereupon the nut can be turned on the spindle, and when said pressure is released the strainable ring moves out of the base and pushes the annular ring member into a position where its serrations are in engagement with the nut serrations, thereby locking the nut.

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