Impact wrench having dynamically tuned drive components and method thereof

Patent metadata

Field	Value
Publication number	US-10427277-B2
Application number	US-201615290957-A
Country	US
Kind code	B2
Filing date	Oct 11, 2016
Priority date	Apr 5, 2011
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

The present invention provides methods and systems an impact wrench having dynamically tuned drive components, such as an anvil/socket combination, and related methodology for dynamically tuning the drive components in view of inertia displacement, as well as stiffness between coupled components, and with regard to impact timing associated with clearance gaps between the component parts.

First claim

What is claimed is:

1. A method of dynamically tuning the drive components of an impact wrench, the method comprising
modifying the interface between an anvil and a socket so that the combined stiffness of the anvil and the socket when coupled together is in the region of 4/3 the stiffness of the hex fastener on which the impact wrench is being used; and
modifying the weight distribution of the anvil and the socket so that their combined inertia, when removably coupled together, is equal to within 10% of the inertia of a hammer of the impact wrench, thereby facilitating a hammer velocity of near zero when the socket exerts peak force upon the fastener during tightening.

2. The method of claim 1 , wherein the modified interface is a splined interface.

3. A method of dynamically tuning the drive components of an impact wrench, the method comprising:
modifying the weight distribution of an anvil and a socket so that their combined inertia, when removably coupled together, is within 10%; of the inertia of a hammer of the impact wrench, thereby facilitating a hammer velocity of near zero when the socket exerts peak force upon the fastener during tightening.

4. The method of claim 3 , further comprising modifying an interface between an anvil and a socket so that the combined stiffness of the anvil and socket when coupled together is in the region of 4/3 the stiffness of the hex fastener on which the impact wrench is being used.

5. The method of claim 3 , further comprising using known quantities of hammer inertia, initial hammer velocity, designed anvil stiffness and prescribed hex stiffness to drive an unknown quantity of socket inertia to maximize torque output.

6. The method of claim 3 , wherein the modified weight distribution includes a flange portion of an anvil, wherein the flange portion is integrally connected to the jaws of the anvil.

7. The method of claim 3 , wherein the impact wrench includes a splined interface between the anvil and the socket.

8. The method of claim 4 , wherein the interface between the anvil and the socket is a splined interface.

9. The method of claim 5 , wherein the impact wrench includes a splined interface between the anvil and the socket.

10. The method of claim 6 , wherein the impact wrench includes a splined interface between the anvil and the socket.

11. The method of claim 5 , further comprising modifying the interface between an anvil and a socket so that the combined stiffness of the anvil and socket when coupled together is in the region of 4/3 the stiffness of the hex fastener on which the impact wrench is being used.

12. The method of claim 6 , further comprising modifying the interface between an anvil and a socket so that the combined stiffness of the anvil and socket when coupled together is in the region of 4/3 the stiffness of the hex fastener on which the impact wrench is being used.

13. The method of claim 4 , wherein the modified weight distribution includes a flange portion of an anvil, wherein the flange portion is integrally connected to the jaws of the anvil.

14. The method of claim 5 , wherein the modified weight distribution includes a flange portion of an anvil, wherein the flange portion is integrally connected to the jaws of the anvil.

15. The method of claim 1 , wherein the modified weight distribution includes a flange portion of an anvil, wherein the flange portion is integrally connected to the jaws of the anvil.

16. The method of claim 2 , wherein the modified weight distribution includes a flange portion of an anvil, wherein the flange portion is integrally connected to the jaws of the anvil.

17. The method of claim 1 , further comprising using known quantities of hammer inertia, initial hammer velocity, designed anvil stiffness and prescribed hex stiffness to drive an unknown quantity of socket inertia to maximize torque output.

Assignees

• Ingersoll Rand Co

Inventors

• Mcclung Mark T
• Cooper Timothy R
• Seith Warren A

Classifications

• B25B13/06

  of socket type · CPC title

• B25B21/02

  with means for imparting impact to screwdriver blade or nut socket · CPC title

• B25B21/026 Primary

  Impact clutches · CPC title

• B25B23/0035 Primary

  Connection means between socket or screwdriver bit and tool · CPC title