TORQUE SETTING LUG NUT WRENCH

• US 20080282810A1
• Filed: 05/18/2007
• Published: 11/20/2008
• Est. Priority Date: 05/18/2007
• Status: Active Grant

• Current Assignee: Toyota Motor Corporation
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Wolterman, Michael J.
• Granted Patent: US 7,500,418 B2
• Time in Patent Office: Days
• US Class Current: 73/862.23
• CPC Class Codes: B25B 23/1427 by mechanical means

Abstract

A torque setting lug nut wrench is provided. The torque setting lug nut wrench has a socket dimensioned to fit onto a lug nut of a motor vehicle wheel, a first section extending collinearly from the socket and a second section projecting from the first section. The second section, when grasped by a user, can apply a rotational force on a lug nut within the socket. A torque detection mechanism having a preset torque limit is included and provides a signal to the user applying the rotational force to the lug nut. In an embodiment of the present invention the torque detection mechanism has a single torque setting. In another embodiment, the torque detection mechanism has two torque settings.

Claims

1. A torque setting lug nut wrench comprising:

a socket, said socket dimensioned to fit a lug nut of a motor vehicle wheel;

a first section extending collinearly from said socket;

a second section projecting from said first section at an angle greater than 15 degrees and less than 165 degrees, said second section operable to apply a rotational force on the lug nut of the motor vehicle wheel when the lug nut is within said socket; and

a clicker-type torque detection mechanism attached to said second section and having a preset torque limit, said clicker-type torque detection mechanism having a torque indicating lever and a binding force mechanism having a slot region, a tension spring and a ball detent, said tension spring in contact with said ball detent;

said torque indicating lever extending at least partially through said slot region and said ball detent in contact with said torque indicating lever and operable to provide a signal to a user applying a rotational force to the lug nut within said socket when said preset torque limit has been applied to the lug nut.

6. The invention of claim 1, wherein said binding force mechanism has a set screw in contact with said tension spring.

7. The invention of claim 6, wherein said set screw has a single setting proportional to said preset torque limit.

8. The invention of claim 6, wherein said set screw has a first setting and a second setting, said first setting proportional to a first preset torque limit and said second setting proportional to a second preset torque limit.

9. The invention of claim 1, wherein said torque indicating lever is operable to move from a position in contact with said ball detent to an end surface of said slot region.

10. The invention of claim 9, wherein said torque indicating lever moves from said position in contact with said ball detent to said end surface of said slot region when said a preset torque limit is applied to the lug nut within said socket.

11. The invention of claim 1, further comprising a third section projecting from said first section, said third section operable to be held by a user to prevent said socket of said lug wrench from slipping off of the nut while applying a rotational force to the lug nut.

12. The invention of claim 1, wherein said preset torque limit is between 100 and 150 newton-meters.

13. The invention of claim 1, wherein said preset torque limit is between 190 and 240 newton-meters.

14. The invention of claim 8, wherein said first preset torque limit is between 100 and 150 newton-meters and said second preset torque limit is between 190 and 240 newton-meters.

16. The invention of claim 1, wherein said signal is selected from the group consisting of a sound, a light, a reading on a dial and a reading on a digital display.

2-5. -5. (canceled)

15. (canceled)

17. A torque setting lug nut wrench for use with a motor vehicle having a rim secured to a wheel by a plurality of lug nuts tightened to a preset torque limit, comprising:

a socket, said socket dimensioned to receive said lug nut of said motor vehicle wheel;

a first section extending collinearly from said socket;

a second section projecting from said first section and operable to apply a rotational force on the lug nut when the lug nut is within said socket;

a torque indicating lever projecting from said first section generally parallel with said second section; and

a binding force mechanism attached to said second section and having a slot region, a set screw, a tension spring and a ball detent;

said torque indicating lever extending at least partially through said slot region of said binding force mechanism;

said ball detent in contact with said torque indicating lever and operable to bind said torque indicating lever in a fixed location until said preset torque limit is applied to the lug nut within said socket.

19. The invention of claim 17, wherein said binding force mechanism has a binding force setting proportional to a preset torque limit applied to the lug nut, said binding force setting selected from the group consisting of a setting proportional to a preset torque limit between 100 and 150 newton-meters and a setting proportional to a preset torque limit between 190 and 240 newton-meters.

18. (canceled)

20. A torque setting lug nut wrench comprising:

a socket, said socket dimensioned to fit onto a lug nut of a motor vehicle wheel;

a first section extending collinearly from said socket;

a second section projecting from said first section at an angle greater than 15 degrees and less than 165 degrees, said second section operable to apply a rotational force on the lug nut when the lug nut is within said socket;

a torque indicating lever projecting from said first section generally parallel with said second section;

a binding force mechanism having a slot region, said binding force mechanism attached to said second section; and

a ball detent in communication with said slot region;

said torque indicating lever extending at least partially through said slot region of said binding force mechanism;

said ball detent operable to bind said torque indicating lever in a fixed location until a preset torque limit is applied to the lug nut within said socket.