Electric tool

Patent metadata

Field	Value
Publication number	US-11407138-B2
Application number	US-202016904012-A
Country	US
Kind code	B2
Filing date	Jun 17, 2020
Priority date	Jan 22, 2017
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

An electric tool includes a functional piece, a motor, a case and a fan. The case includes a motor case portion. An airflow inlet and an airflow outlet are formed in the case. When the fan operates, an airflow at the airflow inlet is taken out and is directed to the airflow outlet after the airflow flows through the motor. The motor case portion includes an encircling portion which encircles the motor and an end portion arranged on one end of the encircling portion. A stopping piece stops the airflow from flowing back from one side of the motor to the other side.

First claim

We claim:

1. A circular saw, comprising:
a circular saw blade;
a motor configured to drive the circular saw blade to rotate around a first axis;
a case comprising a motor case portion for accommodating at least a portion of the motor and a protective cover covering at least a portion of the circular saw blade;
a bottom plate supporting the case and forming a rotatable connection with the case around a first rotating axis parallel to the first axis; and
a depth bracket forming a rotatable connection with the bottom plate around a second rotating axis parallel to the first axis,
wherein the protective cover is formed with a guide wall surface extending along an arc, the depth bracket comprises a contact wall moving along an extension direction of the guide wall surface when the case rotates relative to the bottom plate around the first rotating axis, and the contact wall surface is in contact with the guide wall surface when the case rotates relative to the bottom plate around the first rotating axis, and
wherein the guide wall surface is an arc-shaped groove formed on the protective cover for guiding the relative rotation between the bottom plate and the case, and the depth bracket is formed with a guide structure capable of sliding along a guide track of the guide wall surface and the guide structure is a protrusion portion formed on the depth bracket and capable of being embedded into the arc-shaped groove.

2. The circular saw according to claim 1 , wherein the contact wall surface comprises a contact point always contacting the guide wall surface when the case rotates relative to the bottom plate around the first rotating axis, and a distance between the contact point and a rotating point at which the depth bracket rotates relative to the bottom plate is fixed.

3. The circular saw according to claim 2 , wherein the distance between the contact point and the rotating point at which the depth bracket rotates relative to the bottom plate is greater than or equal to 50 mm and less than or equal to 150 mm.

4. The circular saw according to claim 1 , wherein the depth bracket is further formed with an arc hole penetrating through the depth bracket along a direction parallel to the first rotating axis, the circular saw further comprises a sliding rod connected with the case, and the sliding rod passes through the arc hole.

5. The circular saw according to claim 4 , wherein the sliding rod is in clearance fit with the arc hole.

6. The circular saw according to claim 1 , wherein the guide wall surface is arranged at a side of the protective cover close to the motor.

7. The circular saw according to claim 1 , wherein the depth bracket is arranged behind the protective cover and the guide wall surface is provided on a rear surface of the protective cover.

8. A circular saw, comprising:
a motor configured to drive a circular saw blade to rotate around a first axis;
a case comprising a motor case portion for accommodating at least a portion of the motor and a protective cover covering at least a portion of the circular saw blade;
a bottom plate supporting the case and forming a rotatable connection with the case around a first rotating axis parallel to the first axis; and
a depth bracket forming a rotatable connection with the bottom plate around a second rotating axis parallel to the first axis,
wherein the case is formed with a first guide structure for guiding a relative rotation between the bottom plate and the case, the depth bracket is formed with a matching structure for matching with the first guide structure, and the matching structure is capable of sliding along a guide track of the guide structure when the case rotates relative to the bottom plate around the first rotating axis, and
wherein the first guide structure is an arc-shaped groove formed on the protective cover, and the matching structure is formed with a guide structure being a protrusion portion formed on the depth bracket and capable of being embedded into the arc-shaped groove.

9. The circular saw according to claim 8 , wherein the matching structure is formed on one end of the depth bracket away from a rotating point at which the depth bracket rotates relative to the bottom plate.

10. The circular saw according to claim 8 , wherein the matching structure comprises a contact point which always contact the first guide structure when the case rotates relative to the bottom plate around the first rotating axis.

11. A circular saw, comprising:
a circular saw blade;
a motor configured to drive the circular saw blade to rotate around a first axis;
a case comprising a motor case portion for accommodating at least a portion of the motor and a protective cover covering at least a portion of the circular saw blade;
a bottom plate supporting the case and forming a rotatable connection with the case around a first rotating axis parallel to the first axis; and
a depth bracket forming a rotatable connection with the bottom plate around a second rotating axis parallel to the first axis,
wherein the protective cover is formed with a guide rail for guiding a relative rotation between the bottom plate and the case, and the depth bracket is formed with a guide structure capable of sliding along a guide track of the guide rail, and
wherein the guide rail is an arc-shaped groove formed on the protective cover and the guide structure is a protrusion portion formed on the depth bracket and capable of being embedded into the arc-shaped groove.

12. The circular saw according to claim 11 , wherein the guide track of the guide rail is an arc with changing curvature.

13. The circular saw according to claim 11 , wherein the protrusion portion is formed on one end of the depth bracket away from a rotating point at which the depth bracket rotates relative to the bottom plate.

14. The circular saw according to claim 11 , the arc-shaped groove comprises a guide wall surface for guiding the protrusion portion to slide, and the protrusion portion comprises a contact point which always contacts the guide wall surface when the case rotates relative to the bottom plate around the first rotating axis.

15. The circular saw according to claim 14 , wherein a distance between the contact point and the rotating point at which the depth bracket rotates relative to the bottom plate is greater than or equal to 50 mm and less than or equal to 150 mm.

16. The circular saw according to claim 11 , wherein the guide rail is arranged at a side of the protective cover close to the motor.

17. The circular saw according to claim 11 , wherein the depth bracket is arranged behind the protective cover and the guide rail is provided on a rear surface of the protective cover.

18. The circular saw according to claim 11 , wherein the depth bracket is further formed with an arc hole penetrating through the depth bracket along a direction parallel to the first rotating axis, the circular saw further comprises a sliding rod connected with the case, and the sliding rod passes through the arc hole.

19. The circular saw according to claim 18 , wherein the sliding rod is in clearance fit with the arc hole.

Assignees

• Nanjing Chervon Ind Co Ltd

Inventors

• Masatoshi Fukinuki
• Yang Xin
• Lu Bing
• Lu Songsong

Classifications

• B25F5/008 Primary

  Cooling means · 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

• B27B9/02 Primary

  Arrangements for adjusting the cutting depth or the amount of tilting · CPC title

• B25F5/02

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