Portable cutting machine

Patent metadata

Field	Value
Publication number	US-12290960-B2
Application number	US-202318169477-A
Country	US
Kind code	B2
Filing date	Feb 15, 2023
Priority date	Mar 24, 2022
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

A portable cutting machine is provided. The portable cutting machine comprises: a cutting portion including a disc-shaped cutting blade that cuts an object to be cut by rotating, and a first rotation axis that serves as a rotation center of the cutting blade; a drive portion including a drive source and a second rotation axis rotating by drive of the drive source; a transmission portion including a first pulley fixed to the first rotation axis, a second pulley fixed to the second rotation axis, and a belt looped around the first pulley and the second pulley, and configured to transmit a rotational force by the drive portion to the cutting portion; and a case including a storage space for storing the transmission portion and at least one communication portion that connect to the storage space and open to outside.

First claim

What is claimed is:

1. A portable cutting machine, comprising:
a cutting portion including a disc-shaped cutting blade that cuts an object to be cut by rotating, and a first rotation axis that serves as a rotation center of the cutting blade;
a drive portion including a drive source and a second rotation axis rotating by drive of the drive source;
a transmission portion including a first pulley fixed to the first rotation axis, a second pulley fixed to the second rotation axis, and a belt looped around the first pulley and the second pulley, and configured to transmit a rotational force by the drive portion to the cutting portion; and
a case including a storage space for storing the transmission portion and at least one communication portion that connect to the storage space and open to outside; wherein
the storage space is configured to allow liquid to enter and to allow the liquid that has entered the storage space to be discharged to outside via the communication portion.

2. The portable cutting machine according to claim 1 , wherein:
the communication portion is configured to allow the liquid that has entered the storage space to be discharged when the portable cutting machine is in an upright state.

3. The portable cutting machine according to claim 1 , wherein:
the communication portion is positioned below the belt when the portable cutting machine is in an upright state.

4. The portable cutting machine according to claim 1 , wherein:
the case includes a plurality of the communication portions.

5. The portable cutting machine according to claim 1 , wherein:
the second pulley is positioned below the first pulley when the portable cutting machine is in an upright state.

6. The portable cutting machine according to claim 5 , wherein:
the communication portion is positioned below the second pulley when the portable cutting machine is in the upright state.

7. The portable cutting machine according to claim 1 , wherein:
the case includes a housing that houses the drive portion and a first cover that forms the storage space between the housing and the first cover, and
the communication portion includes a groove formed by recessing from an outer surface of the housing toward a side opposite to the storage space.

8. The portable cutting machine according to claim 7 , wherein:
the groove includes a first bottom surface that extends along an up-down direction and a second bottom surface that is continuous with the first bottom surface and inclines downward from an inside to an outside of the portable cutting machine when the portable cutting machine is in an upright state.

9. The portable cutting machine according to claim 7 , wherein:
the first cover includes a lower side wall that is positioned downward when the portable cutting machine is in the upright state, and
the lower side wall includes an inner surface that inclines downward from an outside to an inside of the portable cutting machine.

10. The portable cutting machine according to claim 7 , wherein:
the housing and the first cover are in direct contact.

11. The portable cutting machine according to claim 7 , wherein:
the case further includes a plurality of fixing portions for fixing the first cover to the housing, and
an installation number of the fixing portions is five or less.

12. The portable cutting machine according to claim 1 , wherein:
the second pulley includes an annular recess formed along a circumferential direction around the second rotation axis, and
the housing includes an annular protrusion inserted into the recess in a spaced apart state.

13. The portable cutting machine according to claim 12 , wherein:
a separation distance between the recess and the protrusion is greater on an inside than on an outside in a radial direction thereof.

14. The portable cutting machine according to claim 1 , wherein:
the drive portion is a motor.

15. The portable cutting machine according to claim 1 , further comprising:
a liquid supply mechanism configured to supply the liquid to the cutting blade.

16. The portable cutting machine according to claim 1 , further comprising:
a second cover provided to cover part of the cutting blade, and
an obstruction plate including a portion protruding from a lower part of the case toward a lower part of the second cover when the portable cutting machine is in an upright state and configured to prevent the liquid from reaching the case.

Assignees

• Yamabiko Corp

Inventors

• Nawashiro Renpei

Classifications

• B28D1/24

  with cutting discs · CPC title

• B28D1/228

  Hand-held or hand-operated tools (B28D1/222, B28D1/225 take precedence) · CPC title

• B25F5/02

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

• B24B33/02

  designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes · CPC title

• B24B49/04

  involving measurement of the workpiece at the place of grinding during grinding operation · CPC title