Portable cutting device

Patent metadata

Field	Value
Publication number	US-10913174-B2
Application number	US-201816176957-A
Country	US
Kind code	B2
Filing date	Oct 31, 2018
Priority date	Nov 14, 2017
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A controller 50 is disposed to the front relative to a rotation shaft 11 d of an electric motor 11 above a base 2, so as to be tilted in the up-to-down direction as it extends frontward.

First claim

What is claimed is:

1. A portable cutting device, comprising:
an electric motor including a rotation shaft;
a saw blade that is driven by the electric motor;
a controller that controls the electric motor;
a base that supports a cutting device main body of the portable cutting device, the cutting device main body including the electric motor and the controller; and
a motor housing that houses the electric motor and a controller housing that houses the controller, wherein:
the portable cutting device is configured such that the saw blade cuts into a workpiece which the base is placed on by moving the cutting device main body in a forward direction with respect to the workpiece;
the controller (1) is in front of the rotation shaft in the forward direction, above the base, (2) is oblique to the forward direction with a top end of the controller being rearward of a bottom end of the controller, and (3) has a rectangular parallelepiped shape and a widest surface that is a part of a plane perpendicular to the saw blade:
a rear part of the controller housing is directly connected to a front part of the motor housing such that an upper portion of the controller is housed in the motor housing;
the cutting device further includes a display portion that (1) indicates a state of the electric motor or a state of electric power supplied to the electric motor, (2) is on the widest surface or in an intermediate vicinity of the widest surface and (3) is parallel to the widest surface; and
the display portion is on an opposite side of the controller from the rotation shaft.

2. The portable cutting device according to claim 1 , further comprising a rechargeable battery that supplies electric power to the electric motor, wherein, the rechargeable battery is disposed close to a rear portion of the electric motor.

3. The portable cutting device according to claim 2 , wherein a rear end of the rechargeable battery is disposed in front of a rear end of the base.

4. The portable cutting device according to claim 1 , wherein:
the motor housing and the electric motor are disposed such that the rotation shaft of the electric motor(1) extends from within the motor housing and (2) is perpendicular to the saw blade; and
the controller housing is tilted at the same angle as the controller.

5. The portable cutting device according to claim 1 , wherein the controller is formed integrally with the display portion.

6. The portable cutting device according to claim 1 , wherein the electric motor is a brushless motor.

7. A portable cutting device, comprising:
an electric motor including a rotation shaft, a stator and a rotor;
a saw blade that is (1) driven by the electric motor and (2) perpendicular to the rotation shaft;
a controller that controls the electric motor;
a flat rectangular base that supports a cutting device main body of the portable cutting device, the cutting device main body including the electric motor and the controller; and
a motor housing that houses the electric motor and a controller housing that houses the controller, wherein:
the portable cutting device is configured such that the saw blade cuts into a workpiece which the base is placed on by moving the cutting device main body in a forward direction with respect to the workpiece; and
the controller (1) is in front of the rotation shaft in the forward direction, above the base, (2) is oblique to the forward direction with a top end of the controller being rearward of a bottom end of the controller, and (3) has a rectangular parallelepiped shape and a widest surface that is a part of a plane perpendicular to the saw blade:
a rear part of the controller housing is directly connected to a front part of the motor housing such that an upper portion of the controller is housed in the motor housing;
the cutting device further includes a display portion that (1) indicates a state of the electric motor or a state of electric power supplied to the electric motor, (2) is on the widest surface or in an immediate vicinity of the widest surface and (3) is parallel to the widest surface; and
the display portion is on an opposite side of the controller from the rotation shaft.

8. The portable cutting device according to claim 7 , wherein the cutting device main body is provided with an upwardly extending grip for a user to hold, spanning greater than half of a length of the base in a front-to-rear direction, forming an uppermost component of the portable cutting device, and having an upward facing D-shaped loop relative to the other components of the cutting device main body.

9. The portable cutting device according to claim 8 , further comprising a pullable trigger at a front side of an inner peripheral circumferential surface of the D-shaped loop formed by the grip, the trigger protruding downward and being biased downward by a spring.

10. The portable cutting device according to claim 9 , further comprising a lock-off button, located above the trigger on the grip, which is pushable inwards into the grip, wherein if the lock-off button is not pushed, then the trigger cannot be pulled due to a presence of a stopper.

11. The portable cutting device according to claim 10 , wherein the lock-off button and the trigger are configured such that when the lock-off button is pushed and the trigger is pulled by a finger of the user, the electric motor starts, wherein when the motor starts, the saw blade is rotated, via a reduction gear adjacent to the rotation shaft, wherein the reduction gear has a tip end which the saw blade is mounted on, further wherein the electric motor only runs for a duration of time when the finger of the user pulls the trigger upwards, wherein if the user lets go, then the motor stops running.

12. The portable cutting device according to claim 7 , wherein the controller is housed in the controller housing that is tilted at the same angle as the controller.

13. The portable cutting device according to claim 12 , wherein the controller and the housing are collectively tilted at an angle of 30 to 60 degrees relative to the base of the cutting device.

14. The portable cutting device according to claim 7 , further comprising a rechargeable battery that supplies electric power to the electric motor, wherein,
the rechargeable battery is disposed close to a rear portion of the electric motor.

15. The portable cutting device according to claim 14 , wherein a rear end of the rechargeable battery is disposed in front of a rear end of the base.

Assignees

• Makita Corp

Inventors

• Nakashima Tatsuo

Classifications

• B23Q11/06

  Safety devices for circular cutters · CPC title

• B23D47/12

  of drives for circular saw blades · CPC title

• B25F5/02

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

• B23D45/16

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