Rotary impact tool

Patent metadata

Field	Value
Publication number	US-9555532-B2
Application number	US-201313932415-A
Country	US
Kind code	B2
Filing date	Jul 1, 2013
Priority date	Jul 1, 2013
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

In at least one illustrative embodiment, a rotary impact tool may include an anvil and at least one hammer configured to impact the anvil to cause the anvil to rotate. The anvil may include an output shaft, a first lug extending outward in a radial direction from the output shaft and extending a first distance around the output shaft in a circumferential direction, and a second lug extending outward in the radial direction from the output shaft and extending a second distance, different from the first distance, around the output shaft in the circumferential direction.

First claim

The invention claimed is:

1. A rotary impact tool comprising:
a motor including a rotor and an input shaft coupled to the rotor for rotation therewith about an input axis;
an anvil configured to be rotated about an output axis, the anvil including an output shaft, wherein the anvil has a cylindrical body forming a circumferential surface defining a radial periphery of the anvil; a first lug extending outward from the circumferential surface in a first radial direction and distance from the output shaft and extending a first circumferential distance around the output shaft in a circumferential direction, and a second lug extending outward from the circumferential surface in a second radial direction and distance from the output shaft, wherein the second radial distance is substantially the same as the first radial distance; wherein the second lug extending a second circumferential distance that is different from the first circumferential distance around the output shaft in the circumferential direction; and
wherein the first radial distance and the second radial distance are located beyond the radial periphery of the anvil; and
a first hammer driven by the input shaft and configured to impact the anvil to cause the anvil to rotate about the output axis.

2. The rotary impact tool of claim 1 , wherein the input shaft axis and the output shaft axis are collinear.

3. The rotary impact tool of claim 1 , wherein the input shaft axis and the output shaft axis are non-parallel.

4. The rotary impact tool of claim 1 , wherein:
the output shaft has a proximal end and a distal end spaced apart from the proximal end, the distal end being adapted to be coupled to a fastener driver; and
the first lug is spaced further from the proximal end than the second lug.

5. The rotary impact tool of claim 4 , wherein the second lug extends further around the output shaft in the circumferential direction than the first lug.

6. The rotary impact tool of claim 5 , wherein the first lug is spaced apart from the second lug around the output shaft in the circumferential direction.

7. The rotary impact tool of claim 5 , wherein the first lug is arranged circumferentially opposite the second lug around the output shaft.

8. The rotary impact tool of claim 5 , wherein the first lug and the second lug extend substantially the same distance along the output axis.

9. The rotary impact tool of claim 1 , further comprising a second hammer driven by the input shaft and configured to impact the anvil to cause the anvil to rotate about the output axis.

10. The rotary impact tool of claim 9 , wherein:
the first hammer extends around the output shaft and the first lug; and
the second hammer extends around the output shaft and the second lug.

11. The rotary impact tool of claim 9 , further comprising a carrier coupled to the input shaft for rotation therewith, wherein:
the first hammer is coupled to the carrier for rotation relative to the carrier about a first hammer axis spaced apart from the output axis; and
the second hammer is coupled to the carrier for rotation relative to the carrier about a second hammer axis spaced apart from the output axis and the first hammer axis.

Assignees

• Ingersoll-Rand Company

Inventors

• Amend Ryan Scott
• Eardley Edward Charles
• Cooper Timothy Richard

Classifications

• B25D11/04 Primary

  in which the tool bit or anvil is hit by an impulse member · CPC title

• Y10T74/1836

  Rotary to rotary · CPC title

• B25B21/026 Primary

  Impact clutches · CPC title

• B25B21/023 Primary

  for imparting an axial impact, e.g. for self-tapping screws · CPC title