Patent ID: 11945091
Assignee: MAKITA CORPORATION
Field: Machine tools (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A power tool, comprising:
a motor having a first rotation output;
a reducer (i) configured to reduce the first rotation output from the motor input into the reducer to a second rotation output from the reducer and (ii) including
a preceding internal gear (i) in a preceding stage and (ii) configured to be rotatable at a first reduction ratio;
a succeeding internal gear (i) in a succeeding stage succeeding the preceding internal gear and (ii) configured to be rotatable at a second reduction ratio different from the first reduction ratio,
an engagement member (i) radially outward from the preceding internal gear and the succeeding internal gear and (ii) configured to be switchable between a first position and a second position, the first position being a position at which the engagement member is engaged with the preceding internal gear and restricts rotation of the preceding internal gear, the second position being a position at which the engagement member is engaged with the succeeding internal gear and restricts rotation of the succeeding internal gear,
at least two stages of planetary gears aligned in an axial direction, the planetary gears in the at least two stages being configured to revolve within the preceding internal gear and the succeeding internal gear,
at least two stages of carriers aligned in the axial direction, the carriers supporting the planetary gears, and
an operation unit operable to switch the engagement member selectively to either the first position or to the second position; and

an actuator configured to be actuated by the rotation reduced by the reducer,, wherein:
the carriers are not fixedly connected to each other; and
the reducer is configured such that one of the carriers can rotate at a different rotational speed than another of the carriers.