Threaded fastener assembly

• US 20040170485A1
• Filed: 02/06/2004
• Published: 09/02/2004
• Est. Priority Date: 09/06/2001
• Status: Active Grant

• Current Assignee: MacLean-Fogg Company
• Original Assignee: MacLean-Fogg Company
• Inventors: Wilson, Larry J.
• Granted Patent: US 6,981,829 B2
• Time in Patent Office: Days
• US Class Current: 411/161
• CPC Class Codes: F16B 39/24 by means of washers, spring washers, or resilient plates that lock against the object locking to the screw-thread F16B39/14 , F16B39/34, F16B39/36
• CPC Class Codes: F16B 39/282 Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts

Abstract

The fastener assembly comprises a torquing member and a clamping pressure member assembled together on a common access. The torquing member has annual threads formed around the axis. An annular bearing surface extends around the axis on one end of the member. The clamping pressure member has an annular bearing surface formed around the axis on one end and an annular clamping surface extending around the axis on an opposite end. The annular bearing surface of the torquing member includes a first series of helically inclined surface segments having substantially the same pitch axis as the threads and a second series of helically inclined surface segments having the same pitch axis as the threads but a pitch equal to or greater than that of the threads, with an opposite incline. The annual bearing surface on the clamping pressure member includes a first series of helically inclined surface segments having substantially the same pitch axis as the threads, and a second series of helically inclined surface segments having substantially the same pitch and direction as said equal or greater pitch. Helically inclined bearing surfaces on the torquing member and the clamping pressure member engage each other in locking relationship.

Claims

1. A fastener assembly comprising:

a) a torquing member and a clamping pressure member assembled on a common axis;

b) said torquing member having annular threads formed around said axis and an annular bearing surface extending around said axis on one end;

c) said clamping pressure member having an annular bearing surface formed around said axis on one end and facing said torquing member bearing surface, and an annular clamping surface extending around said axis on an opposite end;

d) said annular bearing surface on said torquing member comprising a first series of helically inclined surface segments having substantially the same pitch axis as said threads and a second series of helically inclined surface segments having the same pitch axis as said threads but a pitch equal to or greater than said threads, with opposite incline;

e) said annular bearing surface on said clamping pressure member comprising a first series of helically inclined surface segments having substantially the same pitch axis as said threads, and a second series of helically inclined surface segments having substantially the same pitch and direction as said equal or greater pitch.

2. The fastener of claim 1 further characterized in that:

a) said helically inclined surface segments of said first series alternate with said helically inclined surface segments of said second series.

3. A fastener assembly comprising:

a) a torquing member and a clamping pressure member assembled on a common axis;

b) said torquing member having annular threads with a predetermined pitch formed around said axis and an annular bearing surface extending around said axis on one end;

c) said clamping pressure member having an annular bearing surface formed around said axis on one end and facing said torquing member bearing surface, and an annular clamping surface extending around said axis on an opposite end;

d) said annular bearing surface on said torquing member comprising a first series of helically inclined surface segments having substantially the same pitch and pitch axis as said threads and a second series of helically inclined surface segments having the same pitch axis as said threads but a pitch different than said predetermined pitch and inclined in the opposite direction;

e) said annular bearing surface on said clamping pressure member comprising a first series of helically inclined surface segments having substantially the same pitch and pitch axis as said threads, and a second series of helically inclined surface segments having substantially the same pitch and direction as said equal or greater pitch.

4. The fastener of claim 3 further characterized in that:

a) said helically inclined surface segments of said first series alternate with said helically inclined surface segments of said second series in each of said annular bearing surfaces.

5. The fastener of claim 3 further characterized in that:

a) said first and second series of helically inclined surface segments in said torquing member bearing surface being equal in number to each other.

6. The locking fastener of claim 5 further characterized in that:

a) said first and second series of helically inclined surface segments in said pressure member bearing surface being equal in number to each other.