Electric cutting or drilling tools that use battery packs as power sources

Patent metadata

Field	Value
Publication number	US-9287751-B2
Application number	US-201314022995-A
Country	US
Kind code	B2
Filing date	Sep 10, 2013
Priority date	Sep 26, 2012
Publication date	Mar 15, 2016
Grant date	Mar 15, 2016

Abstract

An electric tool may include a tool main body configured to be able to mount a battery pack. The tool main body may include an electric motor, a controller for controlling the electric motor, and a centrifugal fan rotatably driven by the electric motor for producing a flow of air. The controller may be positioned such that the flow of air produced by the centrifugal fan is applied to at least a part of the controller.

First claim

What is claimed is:

1. An electric tool comprising:
a tool main body configured to be able to mount a battery pack, the tool main body including:
an electric motor configured to rotate with a supply of an electric power from the battery pack;
a centrifugal fan rotatably driven by the electric motor for producing a flow of air;
a controller configured to control the electric motor with respect to a rotational drive of the electric motor; and
a cutting blade rotatably driven by the electric motor, the cutting blade extending parallel to the radial direction of the centrifugal fan,
wherein the controller is disposed within the tool main body such that at least a part of a surface of the controller is positioned on a radially outer side of the centrifugal fan,
wherein the surface of the controller includes a longer side surface and a shorter side surface, the longer side surface is positioned on a radially outer side of the centrifugal fan, and the longer side surface ends in a vertical direction in parallel to a rotational axis of the centrifugal fan,
wherein the longer side surface includes two opposite longer side surfaces and the shorter side surface includes four or more shorter side surfaces connecting between the opposite longer side surfaces, and one of the opposite longer side surfaces directly opposes the centrifugal fan on the radially outer side, and
wherein the at least a part of the controller is positioned on a rear side of the centrifugal fan with respect to a machining proceeding direction so as to directly oppose the centrifugal fan on the radially outer side.

2. The electric tool according to claim 1 , wherein the electric tool is a hand-held electric tool, and the tool main body further includes a handle portion configured to be grasped by a user, so that the electric tool can be operated while the user supports the electric tool by grasping the handle portion.

3. The electric tool according to claim 1 , wherein the controller is positioned on a rear side of the electric motor with respect to a machining proceeding direction.

4. The electric tool according to claim 1 , wherein the controller is fixed in position within the tool main body with the shorter side surface of the controller being positioned to extend along a tool machining proceeding direction.

5. The electric tool according to claim 1 , wherein the tool main body further includes a battery mounting portion to which the battery pack is removably mounted, and the controller is positioned on a front side of the battery mounting portion with respect to a machining proceeding direction.

6. The electric tool according to claim 1 , wherein the tool main body further includes a controller retaining compartment configured to retain the controller therein and to allow air blown from the centrifugal fan to flow therethrough.

7. The electric tool according to claim 6 , wherein the controller retaining compartment includes a communication opening and a discharge opening, the communication opening communicating between inside of the tool main body and the inside of the controller retaining compartment, and the discharge opening communicating between the inside of the controller retaining compartment and the outside of the tool main body.

8. An electric tool comprising:
a tool main body configured to be able to mount a battery pack, the tool main body including:
an electric motor configured to rotate with a supply of an electric power from the battery pack;
a controller configured to control the electric motor;
a centrifugal fan rotatably driven by the electric motor for producing a flow of air; and
a cutting blade rotatably driven by the electric motor, the cutting blade extending parallel to the radial direction of the centrifugal fan,
wherein the controller is positioned such that the flow of air produced by the centrifugal fan is applied to at least a part of the controller,
wherein the surface of the controller includes a longer side surface and a shorter side surface, the longer side surface is positioned on a radially outer side of the centrifugal fan, and the longer side surface extends in a vertical direction in parallel to a rotational axis of the centrifugal fan,
wherein the longer side surface includes two opposite longer side surfaces and the shorter side surfaces includes four or more shorter side surfaces connecting between the opposite longer side surfaces, and one of the opposite longer side surfaces directly opposes the centrifugal fan on the radially outer side, and
wherein at least a part of the controller is positioned on a rear side of the centrifugal fan with respect to a machining proceeding direction so as to directly oppose the centrifugal fan on the radially outer side.

9. The electric tool according to claim 8 , wherein:
the controller is positioned on a radially outer side of the centrifugal fan.

Assignees

• Makita Corp

Inventors

• Naito Tsutomu
• Inayoshi Hirotomo

Classifications

• B25F5/008 Primary

  Cooling means · CPC title

• B26B25/00

  Hand cutting tools involving disc blades, e.g. motor-driven (details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• H02K7/145 Primary

  Hand-held machine tool · CPC title

• B23D47/00

  Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts (constructional features of these parts per se B23Q; details or components, e.g. casings, bodies, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title