Drive assembly for a power tool
AssigneeMilwaukee Electric Tool Corporation
InventorsJacob P. Schneider, Braden A. Roberts, Troy C. Thorson, Evan Brown
Life of this patent
Estimating the term…
Abstract
An anvil configured to be impacted by a hammer in an impact wrench. The anvil defines a rotational axis. The anvil includes an anvil lug having a driven surface engageable with the hammer. The driven surface includes an involute profile. The involute profile is formed by a base cylinder defining a central axis. The central axis is offset from the rotational axis of the anvil.
Claims17
An anvil configured to be impacted by a hammer in an impact wrench, the anvil defining a rotational axis, the anvil comprising:
- an anvil lug including a driven surface engageable with the hammer, the driven surface including an involute profile,
- wherein the involute profile is formed by a base cylinder defining a central axis,
- wherein the central axis is offset from the rotational axis of the anvil,
- wherein the anvil lug is a first anvil lug, wherein the anvil further comprises a second anvil lug positioned opposite the first anvil lug, and wherein the anvil defines an anvil lug diameter from a distal end of the first anvil lug to a distal end of the second anvil lug, and
- wherein the base cylinder defines a base cylinder diameter, and wherein the base cylinder diameter is greater than the anvil lug diameter.
A hammer configured to impact an anvil in an impact wrench, the hammer defining a rotational axis, the hammer comprising:
- a body having an inner surface defining a hammer inner diameter;
- and
- a hammer lug extending inwardly from the inner surface toward the rotational axis, the hammer lug including a drive surface engageable with the anvil, the drive surface including an involute profile,
- wherein the involute profile is formed by a base cylinder defining a central axis,
- wherein the central axis is offset from the rotational axis of the hammer,
- wherein the drive surface is concave,
- wherein the base cylinder defines a base cylinder diameter, and
- wherein the base cylinder diameter is greater than the hammer inner diameter.
A drive assembly for use in an impact wrench, the drive assembly comprising:
- a hammer configured to rotate about a rotational axis, the hammer including a body having an inner surface defining a hammer inner diameter and a hammer lug extending inwardly from the inner surface toward the rotational axis, the hammer lug having a drive surface;
- and
- an anvil including an anvil lug, the anvil lug having a driven surface, wherein the drive surface of the hammer is configured to strike the driven surface of the anvil to transmit torque to the anvil,
- wherein the drive surface and the driven surface each include an involute profile formed by a base cylinder defining a base cylinder diameter, and
- wherein the base cylinder diameter is greater than the hammer inner diameter.
Dependencies are inferred from the claim text.