Chainsaw

Patent metadata

Field	Value
Publication number	US-10322518-B2
Application number	US-201715450180-A
Country	US
Kind code	B2
Filing date	Mar 6, 2017
Priority date	Mar 10, 2016
Publication date	Jun 18, 2019
Grant date	Jun 18, 2019

Abstract

Disclosed is a chainsaw capable of introducing outside air into a body casing by rotation of a cooling fan to adequately cool a control unit provided inside the body casing. The chainsaw is configured to cool a control unit provided inside a body casing by a cooling fan being rotated under driving of an electric motor, wherein a handle comprises a base portion through which the handle (30) is attached to the body casing, and a grip formed to extend from the base portion in such a manner as to be grippable by a worker; and an air inlet is formed in a counter wall of the body casing opposed to the base portion of the handle, and wherein the base portion is attached to the counter wall of the body casing to cover the air inlet in an air introduceable state.

First claim

What is claimed is:

1. A chainsaw comprising:
a body casing;
an electric motor provided inside the body casing;
a guide bar provided in a front portion of the body casing, the guide bar protruding forwardly from the body casing;
a saw chain provided around an outer periphery of the guide bar in an endlessly movable manner, the electric motor driving the saw chain along the outer periphery of the guide bar;
a control unit provided inside the body casing, and configured to control driving of the electric motor;
an air inlet for allowing outside air to be introduced into the body casing therethrough; and
a cooling fan attached to a rotary shaft that is rotatable by the driving of the electric motor, the cooling fan being configured to cool the control unit by outside air introduced from outside the body casing, and
a handle that is a separate member from the body casing, the handle being attached to the body casing with a gap therebetween,
wherein the handle comprises a base portion through which the handle is attached to the body casing, and a grip formed to extend from the base portion in such a manner as to be grippable by the worker;
the body casing has a counter wall that faces the base portion of the handle;
the air inlet is formed in the counter wall; and
the base portion is attached to the body casing to cover the air inlet in an air introduceable state.

2. The chainsaw as recited in claim 1 , wherein the control unit provided inside the body casing is disposed between the air inlet and the cooling fan.

Assignees

• Makita Corp

Inventors

• Kachi Hideki
• Haneda Koji

Classifications

• B25F5/02

  Construction of casings, bodies or handles {(B25F5/006, B25F5/008 take precedence)} · CPC title

• B27B17/00 Primary

  Chain saws; Equipment therefor {(slotting or mortising machines equipped with chain cutters B27F5/06)} · CPC title

• B27B17/0033

  Devices for attenuation of vibrations · CPC title

• B25F5/008 Primary

  Cooling means · 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