Work tool

Patent metadata

Field	Value
Publication number	US-10919137-B2
Application number	US-201815909366-A
Country	US
Kind code	B2
Filing date	Mar 1, 2018
Priority date	Mar 3, 2017
Publication date	Feb 16, 2021
Grant date	Feb 16, 2021

Abstract

A work tool, in which any one of a plurality of operation modes is selectable and which is configured to operate according to the selected operation mode, includes a switch for driving a tool accessory, an operation member, a mode switching member and a movement restricting mechanism. The operation member is configured to be held in an off-position in a non-pressed state and configured to move to an on-position in response to an external pressing operation. The mode switching member is configured to be switched between a plurality of switching positions in response to an external operation, the switching positions respectively corresponding to the operation modes. The movement restricting mechanism is configured to restrict a movement of the operation member from the off-position to the on-position in interlock with a switching operation of the mode switching member.

First claim

What is claimed is:

1. A work tool, in which any one of a plurality of operation modes is selectable and which is configured to operate according to the selected operation mode, the work tool comprising:
a switch for driving a tool accessory;
an operation member configured to be held in an off-position in a non-pressed state and configured to move to an on-position in response to an external pressing operation, the operation member in the off-position placing the switch in an off-state, the operation member in the on-position placing the switch in an on-state;
a mode switching member configured to be switched between a plurality of switching positions in response to an external operation, the switching positions respectively corresponding to the operation modes; and
a movement restricting mechanism configured to restrict movement of the operation member from the off-position to the on-position when the mode switching member is in one or more, but less than all, of the plurality of switching positions; wherein:
the plurality of operation modes include a hammer mode and a drill mode, only a hammering operation of linearly driving the tool accessory in a direction of a prescribed driving axis being performed in the hammer mode, at least a drilling operation of rotationally driving the tool accessory around the driving axis being performed in the drill mode,
the plurality of switching positions include a hammer mode position and a drill mode position, the hammer mode position and the drill mode position respectively corresponding to the hammer mode and the drill mode;
the movement restricting mechanism is configured to allow the movement of the operation member to the on-position when the mode switching member is in the hammer mode position; and
the movement restricting mechanism is configured to prohibit the movement of the operation member to the on-position when the mode switching member is in the drill mode position, while allowing prohibition of the movement to be cancelled in response to an external operation.

2. The work tool as defined in claim 1 , wherein:
the movement restricting mechanism includes:
a restricting member configured to be held in a prohibiting position in a non-pressed state and configured to move from the prohibiting position to an allowing position in response to an external pressing operation, the restricting member prohibiting the movement of the operation member to the on-position in the prohibiting position and allowing the movement of the operation member to the on-position in the allowing position; and
an interlocking member configured to move in interlock with the switching operation of the mode switching member, and

the interlocking member is configured to move to a separate position spaced apart from a moving path of the restricting member in interlock with the switching operation of the mode switching member to the drill mode position, thereby allowing the restricting member to move to the allowing position in response to the pressing operation.

3. The work tool as defined in claim 2 , wherein:
the movement restricting mechanism includes a biasing member configured to bias the restricting member so as to hold the restricting member in the prohibiting position,
the restricting member is configured to be movable in a prescribed direction, and configured such that both ends of the restricting member in the prescribed direction are subject to the pressing operation, the prescribed direction crossing the driving axis, and
the allowing position is provided on each side of the prohibiting position in the prescribed direction.

4. The work tool as defined in claim 2 , wherein:
the interlocking member is configured to move in contact with the restricting member to a first contact position on the moving path of the restricting member in interlock with the switching operation of the mode switching member to the hammer mode position, thereby causing the restricting member to move to the allowing position, and
the interlocking member is further configured to be in contact with the restricting member in the first contact position, thereby prohibiting the restricting member from moving to the prohibiting position.

5. The work tool as defined in claim 4 , wherein:
the interlocking member is configured to be movable in the direction of the driving axis and has a first inclined surface, the first inclined surface inclined with respect to the driving axis,
the restricting member is configured to be movable in a direction crossing the driving axis and has a second inclined surface, the second inclined surface being configured to come into contact with the first inclined surface, and
the interlocking member is configured to move in the direction of the driving axis in a state in which the first inclined surface is in contact with the second inclined surface, in interlock with the switching operation of the mode switching member to the hammer mode position, thereby causing the restricting member to move to the allowing position.

6. The work tool as defined in claim 5 , wherein:
the interlocking member has a first vertical surface, the first vertical surface extending generally perpendicular to a moving direction of the restricting member,
the restricting member has a second vertical surface, the second vertical surface extending generally perpendicular to the moving direction of the restricting member, and
the interlocking member is configured such that the first vertical surface is in contact with the second vertical surface in the first contact position, thereby prohibiting the the restricting member from moving to the prohibiting position.

7. The work tool as defined in claim 4 , further comprising:
a driving mechanism configured to drive the tool accessory;
a first housing that houses the driving mechanism; and
a second housing including a grip part configured to be held by a user, the second housing being connected to the first housing via an elastic element so as to be movable in the direction of the driving axis relative to the first housing, wherein:
the interlocking member is connected in an interlocking manner to the mode switching member provided to the first housing,
the restricting member is provided to the second housing so as to be movable in a direction crossing the driving axis, and
the interlocking member includes a sliding part, the sliding part being configured to slide in the direction of the driving axis relative to the restricting member when the second housing moves relative to the first housing in the direction of the driving axis in a state in which the interlocking member is disposed in the first contact position in the hammer mode.

8. The work tool as defined in claim 1 , wherein:
the operation modes include a drive prohibition mode, driving of the tool accessory being prohibited in the drive prohibition mode,
the switching positions include a drive prohibition mode position corresponding to the drive prohibition mode, and
the movement restricting mechanism is configured to prohibit the movement of the operation member to the on-position in interlock with a switching operation of the mode switching member to the drive prohibition mode position, while not allowing prohibition of the movement to be cancelled.

9. The work tool as defined in claim 1 , wherein:
the movement restricting mechanism includes:
a restricting member configured to be held in a prohibiting position in a non-pressed state and configured to move from the prohibiting position to an allowing position in response to an external pressing operation, the restricting member prohibiting the movement of the operation member to the on-position in the prohibiting position and allowing the movement of t

Assignees

• Makita Corp

Inventors

• Iida Hitoshi
• Furusawa Masanori
• Watanabe Kei

Classifications

• B25D2216/0015

  Tools having a percussion-only mode · CPC title

• B25D16/006 Primary

  Mode changers; Mechanisms connected thereto · CPC title

• B25D2216/0023

  Tools having a percussion-and-rotation mode · CPC title

• B25D2250/261

  Means for locking an operative switch on · CPC title

• B25D2216/0069

  Locking means · CPC title