Electric circular saw

Patent metadata

Field	Value
Publication number	US-12145205-B2
Application number	US-202217743767-A
Country	US
Kind code	B2
Filing date	May 13, 2022
Priority date	Dec 31, 2019
Publication date	Nov 19, 2024
Grant date	Nov 19, 2024

Abstract

An electric circular saw includes a saw blade, a drive assembly, a housing, and a base plate. The drive assembly is used for driving the saw blade to rotate around a first axis. The electric circular saw further includes a dust-blowing structure. The dust-blowing structure includes a wind-blowing assembly disposed on the drive assembly, a dust-blowing portion disposed on the base plate and a wind guide portion disposed between the dust-blowing portion and the wind-blowing assembly. The dust-blowing portion includes a flow guide hole and a flow guide groove disposed on the base plate. The flow guide hole is a through hole extending through the base plate. The flow guide groove is a groove disposed on the lower side of the base plate. The flow guide hole communicates with the flow guide groove.

First claim

What is claimed is:

1. An electric circular saw, comprising:
a housing provided with an accommodation space;
a saw blade for cutting a workpiece;
a shield surrounding at least a portion of the saw blade;
a drive assembly, wherein at least part of the drive assembly is disposed in the accommodation space and the drive assembly is configured to drive the saw blade to rotate around a first axis;
a base plate for connecting the housing and the shield; and
a dust-blowing structure, wherein the dust-blowing structure comprises:
a wind-blowing assembly disposed on the drive assembly;
a dust-blowing portion disposed on the base plate; and
a wind guide portion disposed between the dust-blowing portion and the wind-blowing assembly;
wherein the dust-blowing portion comprises a flow guide hole and a flow guide groove disposed on the base plate, the flow guide hole is a through hole passing through the base plate, the flow guide groove is a groove disposed on a lower side of the base plate, and the flow guide hole communicates with the flow guide groove.

2. The electric circular saw according to claim 1 , wherein the drive assembly comprises an electric motor and a gearbox and the gearbox is formed with an opening for the wind-blowing assembly to blow out a heat dissipation wind.

3. The electric circular saw according to claim 2 , wherein the gearbox comprises a connection portion for connecting with the base plate and the wind guide portion is arranged on the connection portion.

4. The electric circular saw according to claim 2 , wherein the wind guide portion is disposed at the opening and is formed with a guide rib for guiding the heat dissipation wind.

5. The electric circular saw according to claim 4 , wherein the base plate comprises a base plate plane extending in a first plane, in a plane parallel to the first plane the guide rib extends substantially in a second straight line, in a plane perpendicular to the first axis the guide rib extends substantially in a third straight line, a straight line parallel to the first plane and perpendicular to the first axis is defined as a first straight line, the first straight line and the second straight line intersect and form an included angle α, the included angle α is greater than or equal to 5° and less than or equal to 50°, the first straight line and the third straight line intersect and form an included angle β, and the included angle β is greater than or equal to 5° and less than or equal to 50°.

6. The electric circular saw according to claim 1 , wherein the base plate comprises a base plate plane extending in a first plane, the wind guide portion comprise a first guide surface and a second a second guide surface, a straight line parallel to the first plane and perpendicular to the first axis is defined as a first straight line, the first guide surface extends along a plane perpendicular to the base plate plane and intersecting the first straight line obliquely to form an included angle α, the included angle α is greater than or equal to 5° and less than or equal to 50°, the second guide surface extends along a plane parallel to the first axis and intersecting the first straight line obliquely to form the included angle β, and the included angle β is greater than or equal to 5° and less than or equal to 50°.

7. The electric circular saw according to claim 1 , further comprising a guide portion for guiding a cut direction wherein at least a portion of the dust-blowing portion is disposed on a rear side of the guide portion.

8. The electric circular saw according to claim 7 , wherein the guide portion is arranged at the base plate and the dust-blowing portion guides a heat dissipation wind to the guide portion or a front side of the guide portion.

9. The electric circular saw according to claim 8 , wherein the guide portion is arranged at an upper surface of the base plate.

10. The electric circular saw according to claim 7 , wherein the guide portion and the saw blade are both arranged in a straight line extending in a front-rear direction.

11. The electric circular saw according to claim 7 , wherein the guide portion is disposed in a space where the flow guide groove is located.

12. The electric circular saw according to claim 7 , wherein the base plate comprises a base plate plane extending in a first plane, the flow guide groove has a projection in the base plate plane, and the guide portion is disposed in the range of this projection.

13. The electric circular saw according to claim 1 , wherein a width of the flow guide hole in a left-right direction is substantially the same as a width of the flow guide groove in the left-right direction.

14. The electric circular saw according to claim 1 , wherein a depth of the flow guide groove in an up-down direction is greater than or equal to 0.5 mm and less than or equal to 5 mm.

15. The electric circular saw according to claim 1 , further comprising a handle connected to the housing and comprising a primary handle and a secondary handle wherein the secondary handle is detachably connected to the housing, the secondary handle comprises a base portion and an outer cover portion, and the outer cover portion is directly formed on an outer surface of the base portion and covers the outer surface.

16. The electric circular saw according to claim 15 , wherein the outer cover portion and the base portion are integrally formed by injection molding.

17. An electric circular saw, comprising:
a housing provided with an accommodation space;
a saw blade for cutting a workpiece;
a shield surrounding at least a portion of the saw blade;
a drive assembly, wherein at least part of the drive assembly is disposed in the accommodation space and the drive assembly is configured to drive the saw blade to rotate around a first axis;
a base plate for connecting the housing and the shield;
a guide portion for guiding a cut direction; and
a dust-blowing structure configured to blow a wind to the guide portion or a front side of the guide portion to blow away dust near the guide portion,
wherein the guide portion is arranged on an upper surface of the base plate, the dust-blowing structure comprises a flow guide hole and a flow guide groove disposed on the base plate, the flow guide hole is a through hole passing through the base plate, the flow guide groove is a groove disposed on a lower side of the base plate, and the flow guide hole communicates with the flow guide groove.

18. The electric circular saw according to claim 17 , wherein a width of the flow guide hole in a left-right direction is substantially the same as a width of the flow guide groove in the left-right direction.

19. The electric circular saw according to claim 17 , wherein the base plate comprises a base plate plane extending in a first plane, the flow guide groove has a projection in the base plate plane, and the guide portion is disposed in the range of this projection.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Lu Bing
• Wang Rong

Classifications

• B23D45/16 Primary

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

• B23D59/0062 Primary

  by blowing · CPC title

• B23Q11/12

  Arrangements for cooling or lubricating parts of the machine (B23Q11/14 takes precedence {; movable work or tool supports using fluid bearings or fluid cushion supports B23Q1/38; cooling or lubricating means used in the working area B23Q11/10}) · CPC title

• B25F5/02

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