Apparatus for a burst-through torque indicator

Patent metadata

Field	Value
Publication number	US-12025170-B2
Application number	US-201917280394-A
Country	US
Kind code	B2
Filing date	Sep 27, 2019
Priority date	Sep 27, 2018
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

A nut is configured to be secured to a bolt. The nut includes a main body that defines an axially aligned bore with threads disposed on an inner wall thereof. Further, the nut includes a dome-shaped head that has an axially aligned aperture and that is provided to be deformed by threads on the bolt when a predetermined burst-through torque is applied thereto.

First claim

We claim:

1. A nut configured to couple to a bolt, the nut comprising:
a main body defining an axially aligned bore and including a first end, a second end, and threads disposed on an interior wall thereof; and
a continuous dome-shaped head disposed at the second end thereof having an axially aligned aperture with an aperture diameter that is smaller than a bore diameter of the axially aligned bore,
wherein a beveled portion is disposed between a neck and the second end of the main body,
wherein the neck is formed integrally between the beveled portion and the continuous dome-shaped head, the neck having an outer diameter D′ that is uniformly cylindrical and extending parallel to an axis A of the nut for a height H,
wherein the continuous dome-shaped head is provided to be deformed by threads disposed on the bolt when a predetermined burst-through torque is applied thereto,
wherein the aperture diameter of the axially aligned aperture is inversely related to the predetermined burst-through torque,
wherein the axially aligned aperture is deformed by the threads of the bolt at a burst-through point, and
wherein the deformed nut is rotated beyond the burst through point by an expected number of revolutions around the bolt to provide a proper fitting.

2. The nut of claim 1 , wherein the main body includes a plurality of equidistantly spaced walls.

3. The nut of claim 2 , wherein the main body includes six equidistantly spaced walls.

4. The nut of claim 1 , wherein the continuous dome-shaped head further includes a cavity adjoining the axially aligned bore and the axially aligned aperture.

5. The nut of claim 4 , wherein the cavity has a greatest diameter that is greater than the diameter of the axially aligned bore.

6. The nut of claim 5 , wherein the cavity has a volume that is equal to or less than a volume defined by a threaded portion of the bore.

7. The nut of claim 1 further including a flange disposed at the first end and extending radially outward therefrom.

8. The nut of claim 7 , wherein the main body and the flange are integrally formed.

9. The nut of claim 1 , wherein the bore comprises a circular cross-section.

10. A nut configured to couple to a bolt, the nut comprising:
a flange, the flange having an outer diameter D;
a main body defining an axially aligned bore having threads disposed on an interior wall thereof; and
a continuous dome-shaped head disposed at an outermost end thereof and having an axially aligned aperture with an aperture diameter,
wherein the continuous dome-shaped head is provided to be deformed at a burst-through point by threads disposed on the bolt when a predetermined torque is applied thereto,
wherein a neck is formed integrally between the main body and the continuous dome-shaped head, the neck being uniformly cylindrical and extending parallel to an axis A of the nut for a height H, the neck having an outer diameter D′ that is smaller than the outer diameter D of the flange;
wherein a beveled portion is disposed between the neck and the second end of the main body,
wherein the axially aligned aperture is deformed by the threads of the bolt at a burst-through point, and
wherein the deformed nut is rotated beyond the burst through point by an expected number of revolutions around the bolt to provide a proper fitting.

11. The nut of claim 10 , wherein the predetermined torque is inversely related to the aperture diameter.

12. The nut of claim 10 , wherein the predetermined torque is greater than 1 Nm.

13. The nut of claim 12 , wherein the predetermined torque is greater than 6 Nm.

14. The nut of claim 10 being further compatible with anti-cross threading bolts.

15. The nut of claim 10 , wherein the main body further includes a first end and a second end, and wherein a flange is disposed at the first end thereof and extends radially outward therefrom.

16. The nut of claim 10 , wherein the aperture diameter is smaller than a bore diameter of the axially aligned bore.

Assignees

• Illinois Tool Works

Inventors

• Dapoz Albert James
• Quincy Nicholas

Classifications

• F16B31/021

  by means of a frangible part (F16B31/025, F16B31/028 take precedence; break members in torque limiters or torque indicators in wrenches or screwdrivers B25B23/1415) · CPC title

• F16B35/047

  for preventing cross-threading, i.e. preventing skewing of bolt and nut · CPC title

• F16B31/02

  for indicating {the attainment of a particular tensile load} or limiting tensile load {(apparatus for, or method of, determining value of torque or twisting moment for tightening a nut or other member similarly stressed G01L5/24)} · CPC title

• F16B37/005 Primary

  into which threads are cut during screwing · CPC title

• F16B5/02 Primary

  by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00) · CPC title