One-piece self-locking nut

• US 11,098,748 B2
• Filed: 05/02/2019
• Issued: 08/24/2021
• Est. Priority Date: 03/24/2013
• Status: Active Grant

• Current Assignee: Crushlock, Inc.
• Original Assignee: Crushlock, Inc.
• Inventors: Limatoc, Arnold R.
• Primary Examiner(s): Saether, Flemming
• Application Number:
  US16/401,579
• Publication Number:
  US 20190316626A1
• Time in Patent Office: 845 Days
• Field of Search: 411277, 411278, 411285, 411288, 411290
• CPC Class Codes: F16B 39/026 by swaging the nut on the bolt, i.e. by plastically deforming the nut
• CPC Class Codes: F16B 39/122 foreseen with mating surfaces inclined, i.e. not normal, to the bolt axis
• CPC Class Codes: F16B 39/284 Locking by means of elastic deformation F16B39/2825, F16B39/36, F16B39/38 take precedence
• CPC Class Codes: F16B 39/286 caused by saw cuts
• CPC Class Codes: F16B 39/34 Locking by deformable inserts or like parts

Abstract

A self-locking nut includes a main-nut body and a deformable-nut body. The main-nut body has a recess leading into an interior threaded bore forming x turns of an internal thread therein. The deformable-nut body has an outer flange and an interior threaded bore forming y turns of an internal thread therein. The outer flange of the deformable-nut body is fixed to the main-nut body such that a relief space is formed between the deformable-nut body and the recess. A ratio of x:y is about 2:1.

Claims

1. A self-locking nut comprising:

a main-nut body having a recess in a front surface of the main-nut body, the recess leading into an interior threaded bore forming more than three turns of an internal thread therein, the front surface extending from the recess to an outer perimeter of the main-nut body; and

a deformable-nut body having a central body portion defining an interior threaded bore forming less than three turns of an internal thread therein and an outer flange extending outwardly from the central body portion,

wherein (i) the outer flange of the deformable-nut body is fixed to the front surface of the main-nut body such that a relief space is formed between the deformable-nut body and the recess and (ii) the outer flange of the deformable-nut body is relatively thinner than the central body portion such that the outer flange deforms during installation of the self-locking nut on a threaded bolt shaft.

2. The self-locking nut of claim 1, wherein the outer flange of the deformable-nut body is fixed to the main-nut body such that a generally cylindrical portion of the relief space is established between the interior threaded bore of the deformable-nut body and the interior threaded bore of the main-nut body, and wherein the generally cylindrical portion of the relief space has a first maximum height prior to installation of the self-locking nut on a threaded bolt shaft and wherein the generally cylindrical portion of the relief space is configured to have a second maximum height after installation of the self-locking nut on the threaded bolt shaft, the second maximum height being less than the first maximum height.

3. The self-locking nut of claim 2, wherein the second maximum height is less than fifty percent of the first maximum height.

4. The self-locking nut of claim 1, wherein the relief space provides an area for the deformable-nut body to deform into during installation of the self-locking nut on a threaded bolt shaft.

5. The self-locking nut of claim 1, wherein the outer flange of the deformable-nut body is fixed to the main-nut body such that the deformable-nut body cannot rotate relative to the main-nut body.

6. The self-locking nut of claim 1, wherein the recess extends from a front surface of the main-nut body towards an opposing back surface of the main-nut body, and wherein the recess is an inwardly tapered recess.

7. The self-locking nut of claim 1, wherein the interior threaded bore of the main-nut body forms between about 3.25 and about 6 turns of the internal thread and the interior threaded bore of the deformable-nut body forms between about 0.5 and about 2.75 turns of the internal thread.

8. The self-locking nut of claim 1, wherein the outer flange of the deformable-nut body is configured to act as a pivot for the central body portion to deform during installation of the self-locking nut on the threaded bolt shaft.

9. The self-locking nut of claim 8, wherein the self-locking nut is made from a first material having a first elastic modulus and the threaded bolt shaft is made from a second material having a second elastic modulus that is greater than the first elastic modulus.

10. A self-locking nut comprising:

a main-nut body having (i) a front surface, (ii) an opposing back surface, (iii) an outer surface configured to be engaged by a tool to rotate the self-locking nut about a threaded bolt shaft thereby causing the main-nut body to move axially in a first direction towards an object, (iv) an interior threaded bore forming a plurality of turns of an internal thread therein, and (v) a recess in the front surface extending into the main-nut body; and

a deformable-nut body having (i) a front surface configured to engage the object thereby limiting axial movement of the deformable-nut body, (ii) an opposing back surface, (iii) an outer surface, (iv) a central body portion defining an interior threaded bore forming at least a portion of a turn of an internal thread therein, and (v) an outer flange extending outwardly from the central body portion;

wherein (i) the outer flange of the deformable-nut body is relatively thinner than the central body portion such that the outer flange deforms during installation of the self-locking nut on the threaded bolt shaft and (ii) the outer flange of the deformable-nut body is fixed to the front surface of the main-nut body such that a relief space is formed between a portion of the opposing back surface of the deformable-nut body and the recess, the relief space providing an area for the deformable-nut body to deform into during the installation.

11. The self-locking nut of claim 10, wherein the internal thread of the main-nut body has the same pitch as the internal thread of the deformable-nut body.

12. The self-locking nut of claim 10, wherein the front surface of the main-nut body is welded to the outer flange of the deformable-nut body.

13. A self-locking nut comprising:

a main-nut body having a recess in a front surface of the main-but body, the recess leading into an interior threaded bore forming x turns of an internal thread therein, the front surface extending from the recess to an outer perimeter of the main-nut body; and

a deformable-nut body having a central body portion defining an interior threaded bore forming y turns of an internal thread therein and an outer flange extending outwardly from the central body portion,

wherein (i) the outer flange of the deformable-nut body is relatively thinner than the central body portion allowing the outer flange to deform during installation of the self-locking nut on a threaded bolt shaft, (ii) the outer flange of the deformable-nut body is fixed to the front surface of the main-nut body such that a relief space is formed between the deformable-nut body and the recess, and (iii) x is greater than y.

14. The self-locking nut of claim 13, wherein a ratio of x:

y is about 2;

1.

15. The self-locking nut of claim 13, wherein a ratio of x:

y is about 3;

1.

16. The self-locking nut of claim 13, wherein a ratio of x:

y is about 4;

1.