Electric power tool
AssigneeMakita Corporation
InventorsMakito Teramoto, Kiyonobu Yoshikane
Life of this patent
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Abstract
An electric power tool includes an electric motor and a rotation direction restriction mechanism. The rotation direction restriction mechanism includes an outer ring, an inner circumferential member, cam surfaces, lock members, and a protrusion (eccentric mechanism). The inner circumferential member is located on an inner circumferential side of the outer ring. The cam surfaces are recessed on an outer circumferential surface of the inner circumferential member. The inner circumferential member rotates relatively to the outer ring in a first direction and is restricted from rotating in a second direction when the lock member moves within the corresponding cam surface.
Claims19
An electric power tool comprising:
- an electric motor;
- and
- a rotation direction restriction mechanism configured to restrict a direction of an output rotation of the electric motor, wherein,
- the rotation direction restriction mechanism includes:
- an outer ring;
- an inner circumferential member being arranged on an inner circumferential side of the outer ring;
- a plurality of cam surfaces being recessed on an inner circumferential surface of the outer ring or an outer circumferential surface of the inner circumferential member;
- and
- a plurality of lock members each of which is configured to be movable within a corresponding cam surface such that the plurality of lock members allow the inner circumferential member to rotate relatively to the outer ring in a first direction and restrict in a second direction,
- wherein the outer ring is configured to be eccentric relative to the inner circumferential member.
An electric power tool comprising:
- an electric motor;
- and
- a rotation direction restriction mechanism configured to restrict a direction of an output rotation of the electric motor, wherein,
- the rotation direction restriction mechanism includes:
- an outer ring;
- an inner circumferential member being arranged on an inner circumferential side of the outer ring;
- a plurality of cam surfaces being recessed on an inner circumferential surface of the outer ring or an outer circumferential surface of the inner circumferential member;
- a plurality of lock members each of which is configured to be movable within a corresponding cam surface such that the plurality of lock members allow the inner circumferential member to rotate relatively to the outer ring in a first direction and restrict in a second direction;
- and
- a retaining member configured to surround the outer ring for retaining the ring,
- wherein the outer ring is configured to be eccentric relative to the inner circumferential member by forming
- a protrusion arranged in one of the outer ring or the retaining member such that the protrusion protrudes toward and contacts the other.
An electric power tool comprising:
- an electric motor;
- and
- a rotation direction restriction mechanism configured to restrict a direction of an output rotation of the electric motor, wherein,
- the rotation direction restriction mechanism includes:
- an outer ring;
- an inner circumferential member being arranged on an inner circumferential side of the outer ring;
- a plurality of cam surfaces being recessed on an inner circumferential surface of the outer ring or an outer circumferential surface of the inner circumferential member;
- a plurality of lock members each of which is configured to be movable within a corresponding cam surface such that the plurality of lock members allow the inner circumferential member to rotate relatively to the outer ring in a first direction and restrict in a second, wherein:
- the inner circumferential member is configured to be rotatable by the electric motor,
- the outer ring is configured to be eccentric relative to the inner circumferential member, thereby forming an eccentric mechanism, and
- the eccentric mechanism is configured such that
- the outer ring includes the inner circumferential surface configured to be eccentric relative to a rotation center of the inner circumferential member, or
- the inner circumferential member includes an outer circumferential surface configured to be eccentric relative to a rotation center of the inner circumferential member.
Dependencies are inferred from the claim text.