Cutting device

Patent metadata

Field	Value
Publication number	US-9475140-B2
Application number	US-201414259901-A
Country	US
Kind code	B2
Filing date	Apr 23, 2014
Priority date	May 9, 2013
Publication date	Oct 25, 2016
Grant date	Oct 25, 2016

Abstract

A wind shielding portion is provided in a front side of an exhaust port for cooling air from a motor such that it crosses over a lateral width with respect to a cutting direction. The cooling air which is blown to the wind shielding portion is effectively blown through a ventilation portion having a small ventilating resistance force and towards a marking line guide. Even when the cutting device main body is set at an incline, the cooling air is blown to the wind shielding portion, and is effectively blown through the ventilation portion to the marking line guide.

First claim

We claim:

1. A cutting device comprising:
a base that is brought into contact with an upper surface of a workpiece; and
a cutting device main body that is supported on an upper surface side of the base and includes a circular cutting blade that is rotated by an electric motor, the circular cutting blade for cutting into the workpiece protruding toward a lower surface side of the base, wherein,
a wind shielding portion is provided to cross between a marking line guide provided on a front portion of the base and the cutting blade; and
a ventilation portion that guides air produced by a rotation of the electric motor in a forward direction, the ventilation portion being positioned at a front side of the cutting blade, the ventilation portion guiding the air produced by the rotation of the electric motor toward the marking line guide;
wherein the wind shielding portion consists of a right wall portion and a left wall portion positioned on a right side and a left side, respectively, with respect to a plane defined by the cutting blade; and
an opening serving as the ventilation portion is provided between the wall portions; the opening being formed to be open at an upper side which is opposite to a lower side adjacent to the base.

2. The cutting device according to claim 1 , wherein
one of the right and left wall portions is formed by an angular plate,
the angular plate supports the cutting device main body such that the cutting device main body can be inclined in a lateral direction with respect to a cutting direction in which the workpiece is cut; and
the opening for serving as the ventilation portion is formed between an inner surface of other of the right and left wall portions and an outer surface of the angular plate, the other of the right and left wall portions being different from the angular plate.

3. The cutting device according to claim 2 , wherein the other of the right and left wall portions extends from the angular plate.

4. The cutting device according to claim 1 , wherein the opening has a V shape such that a width of the opening gradually narrows toward a lower side adjacent to the base.

5. The cutting device according to claim 1 , wherein:
an exhaust hole is provided on a left side of the wind shielding portion with respect to the cutting blade in a cutting direction in which the workpiece is cut; and
the wind shielding portion and the ventilation portion having the exhaust hole are configured to direct the air produced by the rotation of the electric motor toward the marking line guide through the ventilation portion and the exhaust hole.

6. The cutting device according to claim 1 , wherein:
the left wall portion is formed by an angular plate, the angular plate supporting the cutting device main body such that the cutting device main body can be inclined in a lateral direction with respect to a cutting direction in which the workpiece is cut;
the right wall portion is attached to a lower portion of the angular plate, and
the opening is formed by an inner surface of the right wall portion and an outer surface of an upper portion of the angular plate.

Assignees

• Makita Corp

Inventors

• Kume Sho
• Abe Kenji

Classifications

• B23D59/00

  Accessories specially designed for sawing machines or sawing devices (lubricating or cooling machine tools in general B23Q11/12) · CPC title

• B23D45/16

  Hand-held sawing devices with circular saw blades · CPC title

• B27B9/00

  Portable power-driven circular saws for manual operation (details or components, e.g. handles, casings, of portable power-driven tools not particularly related to the operation performed B25F5/00) · CPC title

• B23D59/006 Primary

  for removing or collecting chips · CPC title

• B23Q11/0042 Primary

  Devices for removing chips (B23Q11/02, B23Q11/0875 take precedence) · CPC title