Power tool

Patent metadata

Field	Value
Publication number	US-10532489-B2
Application number	US-201715804278-A
Country	US
Kind code	B2
Filing date	Nov 6, 2017
Priority date	Nov 7, 2016
Publication date	Jan 14, 2020
Grant date	Jan 14, 2020

Abstract

A power tool includes a housing, a saw blade for cutting a workpiece, a motor for driving the saw blade to rotate about a first axis, a circuit board for controlling the motor, a heat sink for cooling, and a base plate being formed with a flat surface for contacting with the workpiece during cutting. The housing includes a first containing portion being formed with a first container for containing the motor, a second containing portion extended along a direction substantially parallel to the flat surface from one of the two ends of the first containing portion along a direction substantially perpendicular to the first axis. The second containing portion is formed with a second container which is communicated with the first container. The circuit board and the heat sink are disposed in the second container.

First claim

What is claimed is:

1. A power tool, comprising:
a housing;
a saw blade for cutting a workpiece;
a motor for driving the saw blade to rotate about a first axis, wherein the saw blade is disposed at a front side of the motor;
a circuit board for controlling the motor;
a heat sink for cooling; and
a base plate being formed with a flat surface for contacting with the workpiece during cutting,
wherein the housing comprises a first containing portion and a second containing portion, the first containing portion is formed with a first container for containing the motor, the second containing portion is formed with a second container which is communicated with the first container, the first containing portion has two ends along a direction perpendicular to the first axis, the second containing portion extends from one of the two ends of the first containing portion along a direction parallel to the flat surface, the circuit board and the heat sink are disposed in the second container, and
wherein the heat sink comprises a base board extending along the direction parallel to the flat surface, a plurality of first-type ribs disposed on a first surface of the base board and a plurality of second-type ribs disposed on the first surface, the first surface extends along the direction parallel to the flat surface, a first-type channel is formed between two adjacent first-type ribs, one end of the first-type channel is defined as a first-type air outlet, a second-type channel is formed between two adjacent second-type ribs, one end of the second-type channel is defined as a second-type air outlet, the extending direction of the first-type ribs is parallel to the extending direction of the second-type ribs, the first container comprises a first area for placing the motor and a second area disposed at a rear side of the motor, the first-type air outlet is open towards the second area, a first airflow from the first-type air outlet flows to the second area and then to the first area, the second-type air outlet is open towards the first area, the end of the second-type ribs close to the motor is shorter than the end of the first-type ribs close to the motor so that a guiding channel is formed between the second-type air outlet and the motor, and the guiding channel guides a second airflow from the second-type air outlet flows to the second area.

2. The power tool of claim 1 , wherein the second containing portion is disposed at a center of the motor in a direction perpendicular to the flat surface.

3. The power tool of claim 1 , wherein the second containing portion is aligned with the first containing portion on an end that is removed from the saw blade in a direction parallel to the first axis.

4. The power tool of claim 1 , wherein the housing comprises a handle portion for a user to grip, the handle portion and the first containing portion forming a hole to allow a hand of the user to pass through the hole so as to grip the handle portion and a projection of the second containing portion on a plane perpendicular to the first axis is located out of a projection of the hole on the plane.

5. The power tool of claim 1 , wherein a distance from the second containing portion to the flat surface is greater than or equal to 8 mm and less than or equal to 30 mm in a direction perpendicular to the flat surface.

6. The power tool of claim 1 , wherein the circuit board is disposed on one side of the heat sink in the direction perpendicular to the flat surface and the circuit board comprises a circuit substrate extended in the direction parallel to the flat surface, a first-type electronic element having a heating power which is greater than or equal to a predetermined heating power, a second-type electronic element having a heating power which is less than the predetermined heating power, the first-type electronic element is disposed on a position of the circuit substrate which is corresponded with the first-type ribs, and the second-type electronic element is disposed on a position of the circuit substrate which is corresponded with the second-type ribs.

7. The power tool of claim 1 , wherein the housing comprises a first connecting element allowing the housing to rotatably connect with the base plate about a second axis which is parallel to the first axis, the base plate is connected or formed with a second connecting element for engaging with the first connecting element so as to connect the base plate to the first connecting element, one of the first connecting element and the second connecting element is formed with grooves, and the other of the first connecting element and the second connecting element is formed with bulges being capable of inserting in the grooves.

8. The power tool of claim 7 , wherein the number of the grooves is two and the number of the bulges is two.

9. The power tool of claim 1 , wherein the housing comprises a handle portion for a user to grip, an auxiliary gripping portion allowing the user to grip with the other hand when the user grips the handle portion with one hand, and the auxiliary gripping portion and the motor are located on two sides of the handle portion in the direction parallel to the first axis.

10. The power tool of claim 9 , wherein the housing comprises a guard for partially surrounding the saw blade and the auxiliary gripping portion is at least partially located on one side of the guard that is far from the motor in the direction parallel to the first axis.

11. The power tool of claim 9 , wherein the auxiliary gripping portion has a size in the direction parallel to the first axis which is greater than or equal to 10 mm and less than or equal to 30 mm.

12. The power tool of claim 9 , wherein the auxiliary gripping portion has a size in the direction parallel to the flat surface and perpendicular to the first axis which is greater than or equal to 10 mm and less than or equal to 40 mm.

13. The power tool of claim 9 , wherein the auxiliary gripping portion and the handle portion are disposed on two sides of the saw blade in the direction parallel to the first axis.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Chen Weipeng
• Wang Hongwei
• Fu Xiangqing

Classifications

• B28D1/04 Primary

  with circular {or cylindrical} saw-blades or saw-discs (B28D1/10 takes precedence) · CPC title

• B25F5/02

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

• B28D7/00

  Accessories specially adapted for use with machines or devices of the preceding groups {(B28D5/0058 takes precedence)} · CPC title

• B23D47/12 Primary

  of drives for circular saw blades · CPC title