Impact tool with tapered anvil wing design

Patent metadata

Field	Value
Publication number	US-12257685-B2
Application number	US-202217841221-A
Country	US
Kind code	B2
Filing date	Jun 15, 2022
Priority date	Jul 9, 2021
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

An anvil for an impact mechanism, where the anvil includes wings that taper at a taper angle of about 5 degrees to about 30 degrees. The anvil may also include a shaft extending from the wings, and a drive end adapted to transfer and apply torque to a work piece. The wings of the anvil also include wing impact surfaces that receive rotational impact forces from a hammer. For example, the hammer contacts and applies torque to the wings of the anvil.

First claim

What is claimed is:

1. An anvil for an impact mechanism of an impact tool, the anvil comprising:
a base portion;
a wing extending radially outwardly from the base portion and including an impact surface that tapers at a taper angle of about 5 degrees to about 30 degrees as the wing extends outwardly from the base portion; and
a shaft extending axially from the base portion.

2. The anvil of claim 1 , further comprising a drive proximal to an end of the shaft.

3. The anvil of claim 2 , wherein the drive has a square cross-sectional shape.

4. The anvil of claim 1 , wherein the taper angle is about 15 degrees.

5. The anvil of claim 1 , further comprising a groove portion extending circumferentially around the shaft.

6. The anvil of claim 5 , wherein the groove portion has a groove outer diameter and the shaft has a shaft outer diameter, wherein the groove outer diameter is less than the shaft outer diameter.

7. The anvil of claim 6 , wherein the groove outer diameter is about 25% to about 75% of the shaft outer diameter.

8. The anvil of claim 6 , wherein the groove outer diameter is about 25% to about 50% of the shaft outer diameter.

9. The anvil of claim 1 , wherein an intersection of the wing and the base portion includes a radius that provides a transition from the base portion to the wing.

10. The anvil of claim 9 , wherein the radius is about 100% to about 150% of a base radius of the base portion.

11. The anvil of claim 1 , wherein the impact surface includes a contact area of about 0.01 to about 0.2 square inches that is adapted to contact a hammer lug.

12. An impact mechanism for an impact tool, the impact mechanism comprising:
an anvil including:
an anvil base portion;
a wing extending radially outwardly from the anvil base portion and including an impact surface that tapers at a taper angle of about 5 degrees to about 30 degrees as the wing extends outwardly from the base portion; and
a shaft extending axially from the anvil base portion; and

a hammer including:
a hammer base portion; and
a hammer lug protruding from the hammer base portion, and adapted to impact the impact surface at a contact area of the impact surface.

13. The impact mechanism of claim 12 , wherein the anvil further includes a drive proximal to an end of the shaft.

14. The impact mechanism of claim 13 , wherein the drive has a square cross-sectional shape.

15. The impact mechanism of claim 12 , wherein the anvil further includes a groove portion extending circumferentially around the shaft.

16. The impact mechanism of claim 15 , wherein the groove portion has a groove outer diameter and the shaft has a shaft outer diameter, wherein the groove outer diameter is about 25% to about 75% of the shaft outer diameter.

17. The impact mechanism of claim 16 , wherein the groove outer diameter is about 25% to about 50% of the shaft outer diameter.

18. The impact mechanism of claim 12 , wherein an intersection of the wing and the anvil base portion includes a radius that provides a transition from the anvil base portion to the wing.

19. The impact mechanism of claim 18 , wherein the radius is about 100% to about 150% of a base radius of the anvil base portion.

20. The impact mechanism of claim 12 , wherein the contact area is about 0.01 to about 0.2 square inches.

Assignees

• Snap On Incorporated

Inventors

• Charoenphan Saiphon C
• Robillard Adrian J
• Fuhreck John E
• Kohls Collin T

Classifications

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B25D17/02

  Percussive tool bits {(drill bits for earth drilling E21B10/00)} · CPC title

• B25D1/00 Primary

  Hand hammers {(handles therefor B25G1/00; attachment of handles to the hammer head B25G3/00)}; Hammer heads of special shape or materials · CPC title

• B25B21/02 Primary

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

• B25D2217/0015

  Anvils · CPC title