Power tool

Patent metadata

Field	Value
Publication number	US-12103127-B2
Application number	US-202217709963-A
Country	US
Kind code	B2
Filing date	Mar 31, 2022
Priority date	Apr 13, 2021
Publication date	Oct 1, 2024
Grant date	Oct 1, 2024

Abstract

A power tool includes a motor configured to provide driving force to a tool accessory, a braking mechanism disposed on a driving-force-transmission path from the motor to the tool accessory and configured to put a brake on driving of the tool accessory, at least one attachment portion configured such that an accessory is removably attachable thereto, and a restricting member configured to be directly or indirectly pressed and displaced by the accessory when the accessory is attached to any one of the at least one attachment portion. In a state in which the accessory is not attached to any of the at least one attachment portion, the restricting member is located at a preventive position at which between-members abutment prohibits releasing of a braked state effected by the braking mechanism.

First claim

What is claimed is:

1. A power tool comprising:
a motor configured to provide driving force to a tool accessory;
a braking mechanism disposed on a driving-force-transmission path from the motor to the tool accessory and configured to put a brake on driving of the tool accessory;
at least one attachment portion configured such that an accessory is removably attachable thereto; and
a restricting member configured to be directly or indirectly pressed and displaced by the accessory when the accessory is attached to any one of the at least one attachment portion,
wherein:
in a state in which the accessory is not attached to any of the at least one attachment portion, the restricting member is located at a preventive position at which between-members abutment prohibits an operation of releasing a braked state effected by the braking mechanism,
in a state in which the accessory is attached to any one of the at least one attachment portion, the restricting member is located at an allowable position at which the between-members abutment does not take place so that the operation of releasing the braked state is allowed,
the at least one attachment portion includes a plurality of attachment portions, and
the restricting member is a single member provided to serve for the plurality of attachment portions.

2. The power tool as defined in claim 1 , wherein:
the plurality of attachment portions include a first attachment portion and a second attachment portion,
the allowable position includes a first allowable position and a second allowable position, and
the restricting member is configured to be displaced in a first direction from the preventive position to the first allowable position when the accessory is attached to the first attachment portion, and to be displaced in a second direction opposite to the first direction from the preventive position to the second allowable position when the accessory is attached to the second attachment position.

3. The power tool as defined in claim 1 , further comprising
an intermediate member configured to be pressed and displaced by the accessory when the accessory is attached to any one of the at least one attachment portion, wherein
the restricting member is configured to be pressed and displaced by the intermediate member when the accessory is attached to any one of the at least one attachment portion.

4. The power tool as defined in claim 1 , wherein:
the motor includes a motor shaft,
the power tool further includes a final output shaft to which the tool accessory is attachable, and which is configured such that driving force is transmitted from the motor shaft thereto, and
the braking mechanism is disposed around the motor shaft.

5. The power tool as defined in claim 4 , wherein
the braking mechanism further includes:
a braked member fixed to the motor shaft and disposed so as to circumferentially surround the motor shaft;
a braking member configured to achieve the braked state by being pressed against the braked member, and disposed to be displaceable between a braking position abutted upon the braked member and a non-braking position separated from the braked member;
a biasing member for biasing the braking member toward the braking position; and
a brake-releasing member configured to press and displace the braking member from the braking position toward the non-braking position against biasing force from the biasing member.

6. The power tool as defined in claim 5 , further comprising:
a switch for driving the motor; and
an operating member configured to be displaceable between an OFF position for putting the switch in an OFF-state and an ON position for putting the switch in an ON-state, wherein
the brake-releasing member is configured to work in conjunction with displacement of the operating member between the OFF position and the ON position.

7. The power tool as defined in claim 6 , further comprising
a linking member configured to work in conjunction with displacement of the operating member between the OFF position and the ON position, wherein
the linking member is configured to be displaced when the operating member is displaced from the OFF position to the ON position so as to press the switch into the ON-state as well as to press the brake-releasing member to release the braked state.

8. The power tool as defined in claim 5 , further comprising:
a switch for driving the motor;
an operating member configured to be displaceable between an OFF position for putting the switch in an OFF-state and an ON position for putting the switch in an ON-state; and
a lock-off portion configured to, in response to changing state of engagement with the operating member, switch status of the operating member between a lock-off state in which the operating member is prohibited from being displaced from the OFF position to the ON position and a lock-off-released state in which the operating member is allowed to be displaced from the OFF position to the ON position, wherein
the brake-releasing member is configured to work in conjunction with an operation for changing the status between the lock-off state and the lock-off-released state.

9. The power tool as defined in claim 1 , further comprising
an intermediate member configured to be pressed and displaced by the accessory when the accessory is attached to any one of the at least one attachment portion, wherein:
the restricting member is configured to be pressed and displaced by the intermediate member when the accessory is attached to any one of the at least one attachment portion,
the motor includes a motor shaft,
the power tool further includes a final output shaft to which the tool accessory is attachable, and which is configured such that driving force is transmitted from the motor shaft thereto, and
the braking mechanism is disposed around the motor shaft.

10. The power tool as defined in claim 1 , wherein:
the at least one attachment portion includes a plurality of attachment portions,
the restricting member is a single member provided to serve for the plurality of attachment portions,
the power tool further includes an intermediate member configured to be pressed and displaced by the accessory when the accessory is attached to any one of the at least one attachment portion, and
the restricting member is configured to be pressed and displaced by the intermediate member when the accessory is attached to any one of the at least one attachment portion.

11. The power tool as defined in claim 1 , wherein:
the at least one attachment portion includes a plurality of attachment portions,
the restricting member is a single member provided to serve for the plurality of attachment portions,
the motor includes a motor shaft,
the power tool further includes a final output shaft to which the tool accessory is attachable, and which is configured such that driving force is transmitted from the motor shaft thereto, and
the braking mechanism is disposed around the motor shaft.

12. The power tool as defined in claim 1 , wherein:
the at least one attachment portion includes a plurality of attachment portions,
the restricting member is a single member provided to serve for the plurality of attachment portions,
the motor includes a motor shaft,
the power tool further includes a final output shaft to which the tool accessory is attachable, and which is configured such that driving force is transmitted from the motor shaft thereto,
the braking mechanism is disposed around the motor shaft,
the braking mechanism further includes:
a braked member fixed to the motor shaft and disposed so as to circumferentially surround the motor shaft;
a braking

Assignees

• Makita Corp

Inventors

• Saito Fumiyoshi
• Honma Shinichi

Classifications

• B24B23/028 Primary

  Angle tools · CPC title

• B25F3/00

  Associations of tools for different working operations with one portable power-drive means; Adapters therefor · CPC title

• B25F5/00

  Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for · CPC title

• B24B47/00

  Drives or gearings; Equipment therefor · CPC title

• B24B41/04

  Headstocks; Working-spindles; Features relating thereto · CPC title