Impact wrench
AssigneeIngersoll-Rand Company
InventorsJoshua Odell Johnson, Ryan Scott Amend, Warren Andrew Seith
Life of this patent
Estimating the term…
Abstract
An impact mechanism includes a shaft, a hammer and an anvil coupled to the hammer. The shaft has a first helical groove and the hammer has a second helical groove. A ball is received in the first and second helical grooves to rotationally couple the hammer to the shaft and permit axial travel of the hammer relative to the shaft. An axial stop inhibits axial travel of the hammer along a first travel path and permits axial travel of the hammer along a second travel path. The axial stop includes first and second stop members, the first and second stop members having a first relative position to inhibit axial travel of the hammer and a second relative position to permit axial travel of the hammer.
Claims20
An impact tool comprising:
- a motor;
- a shaft driven for rotation about an axis by the motor, the shaft having a first helical groove;
- a hammer having a second helical groove;
- a ball received in the first and second helical grooves, wherein the ball rotationally couples the hammer to the shaft and permits axial travel of the hammer relative to the shaft;
- an anvil coupled to the hammer;
- and
- an axial stop,
- wherein the hammer is capable of moving along a first travel path and a second travel path different from the first travel path,
- wherein the hammer avoids abutment with the axial stop in the first travel oath to achieve a first axial displacement, and
- wherein the hammer abuts the axial stop in the second travel oath to limit axial displacement to a second axial displacement, less than the first axial displacement.
An impact mechanism for an impact tool, the impact mechanism comprising:
- a shaft having a first helical groove;
- a hammer having a second helical groove;
- a ball received in the first and second helical grooves, wherein the ball rotationally couples the hammer to the shaft and permits axial travel of the hammer relative to the shaft;
- an anvil coupled to the hammer;
- and
- an axial stop,
- wherein the hammer is capable of moving along a first travel path in which the hammer travels a first axial distance and a second travel path in which the axial stop limits axial travel of the hammer to less than the first axial distance to retain the ball within the first and second helical grooves when the hammer travels alone the second travel path.
An impact tool comprising:
- a motor;
- a shaft rotatable about an axis in response to the motor, the shaft defining at least one groove;
- a ball positioned at least partially within the at least one groove;
- a spring member coupled to the shaft;
- a hammer coupled to the shaft, the hammer defining at least one groove positioned to at least partially receive the ball, the hammer having at least one lug;
- an anvil having at least one lug, such that the anvil lug is selectively coupled to the hammer lug for rotation with the hammer about the axis, wherein the spring is positioned to selectively bias the hammer into engagement with the anvil;
- and
- at least one stop member,
- wherein the ball moves radially and axially along at least one of the shaft groove and the hammer groove as the hammer travels along a first helical path with respect to the anvil, and
- wherein the ball remains substantially radially fixed with respect to at least one of the shaft groove and the hammer groove as the hammer travels along a second radial path with respect to the anvil.
Dependencies are inferred from the claim text.