Power tool
AssigneeMakita Corporation
InventorFumitoshi Numata
Life of this patent
Estimating the term…
Abstract
A power tool includes a brake assembly including a swing member swingable about a pivot at an axial center decentered from a center of a brake member, a press member held by the swing member to come in contact with the brake member in response to the swing member swinging, and a spring having an axial center at a second decentered position opposite to the pivot with the center of the brake member between the axial center and the pivot. The axial center is on a second line orthogonal to a first line extending through the center of the brake member and the pivot. The spring has an elastic movable end in contact with an end of the swing member to urge the swing member to a position at which the press member is in contact with the brake member with a switch being in an off state.
Claims20
A power tool, comprising:
- a housing;
- a switch in the housing, the switch being operable to be turned on or off in response to an operation on an operable member;
- a rotational shaft rotatable in response to an operation to turn on the switch;
- a brake member having a circular outer shape and coaxially fixed to the rotational shaft;
- and
- a brake assembly configured to apply braking to the rotational shaft with the switch being in an off state and to release the braking applied to the rotational shaft in response to the operation on the operable member to turn on the switch, the brake assembly including;
- a swing member swingable about a pivot at a first decentered position decentered from a center of the brake member,
- a press member held by the swing member, the press member being configured to come in contact with the brake member in response to the swing member swinging, and
- a spring having a center at a second decentered position opposite to the pivot with the center of the brake member between the center of the spring and the pivot, the center of the spring being on a second line orthogonal to a first line extending through the center of the brake member and the pivot, the spring having a movable end being elastic and in contact with an end of the swing member, the spring being configured to urge the swing member to a braking position at which the press member is in contact with the brake member with the switch being in the off state.
Dependencies are inferred from the claim text.