Anvil for an impact wrench

Patent metadata

Field	Value
Publication number	US-10850371-B2
Application number	US-201916267791-A
Country	US
Kind code	B2
Filing date	Feb 5, 2019
Priority date	Feb 9, 2018
Publication date	Dec 1, 2020
Grant date	Dec 1, 2020

Abstract

An anvil for use with an impact wrench includes a first end, a second end opposite the first end, a shank adjacent the first end, and a head adjacent the second end. The shank includes a diameter and an outer cylindrical surface that defines a longitudinal axis that extends centrally through the anvil between the first end and the second end. The head includes a plurality of planar faces and an outer cylindrical surface. The outer cylindrical surface defines a diameter of the head. A ratio between the diameter of the shank and the diameter of the head is between approximately 1:1 and approximately 1.35:1.

First claim

What is claimed is:

1. An impact wrench comprising:
a housing;
a motor supported by the housing;
an actuator operable to selectively energize the motor;
a gear assembly coupled to the motor; and
a drive assembly coupled to the gear assembly, the drive assembly operable to convert a continuous rotational force provided by the gear assembly to a striking rotational force;
wherein the drive assembly includes an anvil to which the striking rotational force is applied, wherein the anvil comprises
a first end,
a second end opposite the first end,
a shank proximate the first end, the shank having a diameter and an outer cylindrical surface that defines a longitudinal axis that extends centrally through the anvil between the first end and the second end, and
a head proximate the second end, the head including a plurality of planar faces and an outer cylindrical surface, the outer cylindrical surface defining a diameter of the head;

wherein a ratio between the diameter of the shank and the diameter of the head is between approximately 1:1 and approximately 1.35:1.

2. The impact wrench of claim 1 , wherein the diameter of the shank is less than 16 mm.

3. The impact wrench of claim 1 , wherein each of the planar surfaces has a width of 0.375 inches.

4. The impact wrench of claim 3 , wherein the diameter of the shank is 13.2 mm, and wherein the diameter of the head is 12.6 mm.

5. The impact wrench of claim 1 , wherein each of the planar surfaces has a width of 0.5 inches.

6. The impact wrench of claim 1 , wherein each of the planar surfaces has a width of 1 inch.

7. The impact wrench of claim 1 , wherein the plurality of planar surfaces includes four planar surfaces on the head of the anvil, and wherein adjacent planar surfaces on the head, are disposed substantially normal to each other.

8. The impact wrench of claim 1 , wherein the anvil includes a transition zone between the shank and the head.

9. The impact wrench of claim 8 , wherein the area of the transition zone decreases as the ratio between the diameter of the shank and the diameter of the head decreases.

10. The impact wrench of claim 1 , wherein the anvil includes a plurality of radially-extending lugs extending from the shank at the first end of the anvil.

11. An anvil for use with an impact wrench, the anvil comprising:
a first end;
a second end opposite the first end;
a shank proximate the first end, the shank having a diameter and an outer cylindrical surface that defines a longitudinal axis that extends centrally through the anvil between the first end and the second end; and
a head proximate the second end, the head including a plurality of planar faces and an outer cylindrical surface, the outer cylindrical surface defining a diameter of the head;
wherein a ratio between the diameter of the shank and the diameter of the head is between approximately 1:1 and approximately 1.35:1.

12. The anvil of claim 11 , wherein the diameter of the shank is less than 16 mm.

13. The anvil of claim 11 , wherein each of the planar surfaces has a width of 0.375 inches.

14. The anvil of claim 13 , wherein the diameter of the shank is 13.2 mm, and wherein the diameter of the head is 12.6 mm.

15. The anvil of claim 11 , wherein each of the planar surfaces has a width of 0.5 inches.

16. The anvil of claim 11 , wherein each of the planar surfaces has a width of 1 inch.

17. The anvil of claim 11 , wherein the plurality of planar surfaces includes four planar surfaces on the head, and wherein adjacent planar surfaces are disposed substantially normal to each other.

18. The anvil of claim 11 , further comprising a transition zone between the shank and the head.

19. The anvil of claim 18 , wherein the area of the transition zone decreases as the ratio between the diameter of the shank and the diameter of the head gets decreases.

20. The anvil of claim 11 , further comprising a plurality of radially-extending lugs extending from the shank at the first end.

Assignees

• Milwaukee Electric Tool Corp

Inventors

• Xu wei chao
• Hu Guang

Classifications

• B25B21/026 Primary

  Impact clutches · CPC title

• B25B21/02 Primary

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

• B25F5/001

  Gearings, speed selectors, clutches or the like specially adapted for rotary tools · CPC title

• B25B23/00

  Details of, or accessories for, spanners, wrenches, screwdrivers (bolt tensioners B25B29/02) · CPC title

• B25D2217/0015

  Anvils · CPC title