Cut-off saw

Patent metadata

Field	Value
Publication number	US-12415223-B2
Application number	US-202318207874-A
Country	US
Kind code	B2
Filing date	Jun 9, 2023
Priority date	Jun 9, 2023
Publication date	Sep 16, 2025
Grant date	Sep 16, 2025

Abstract

A cut-off saw includes a saw housing having a support arm that protrudes outward from the housing front end and supports a rotatable cutting blade. A blade drive assembly disposed in the support arm includes a gear set and is configured to transmit rotational motion of a motor to the cutting blade. The saw housing includes housing features that are configured to minimize entrance of water into the interior space in applications where cutting is water cooled.

First claim

What is claimed, is:

1. A saw, comprising:
a saw housing, the saw housing including a front end, a rear end, a first side, a second side, a third side, a fourth side, a longitudinal axis that extends through the front end and the rear end, and a hollow support arm that protrudes outward from the front end, the rear end being opposite the front end, the first side, the second side, the third side, the fourth side, the front end and the rear end cooperating to define an interior space of the saw housing, the rear end including a housing rear inlet opening that permits fluid communication between an environment of the saw and the interior space, the first side including a housing side outlet opening disposed between the rear end and the front end, the housing side outlet opening permitting fluid communication between the environment of the saw and the interior space;
an electric motor disposed in the interior space, the electric motor including an output shaft that lies in a plane that is parallel to the longitudinal axis and is rotatable about an output shaft axis;
a motor fan driven by the output shaft and configured to draw cooling air through the saw housing;
a blade drive assembly disposed in the support arm, the blade drive assembly configured to detachably connect a cutting blade to the support arm and transmit a rotational motion of the output shaft to the cutting blade when the cutting blade is connected to the saw; and
a printed circuit board assembly that supports electronics configured to control operation of the saw, the printed circuit board assembly being disposed in the interior space;

wherein
the saw housing includes housing features that are configured to minimize entrance of water into the interior space.

2. The saw of claim 1 , wherein
the first side and the second side corresponding to opposed lateral sides of the saw housing,
the third side corresponds to a top of the saw housing and the fourth side of the saw housing corresponds to a bottom of the saw housing,
the saw comprises a handle having a first end connected to the first side, a second end connected to the second side and a mid portion that faces and is spaced apart from the third side,
the housing side outlet opening is disposed in the first side between the third side and the fourth side,
and the housing features comprise a shelf that protrudes inward from an interior surface of the first side, the shelf disposed between the housing side outlet opening and the fourth side.

3. The saw of claim 2 , wherein
the shelf comprises a proximal end that adjoins the first side and a distal end that is opposite the proximal end and spaced apart from the first side, and
the housing features comprise a facing wall disposed at the shelf distal end, the facing wall extending upward relative to the shelf toward the third side.

4. The saw of claim 2 , wherein the shelf protrudes inward from an interior surface of the first side at a shelf angle relative to the first side, the shelf angle being configured to promote the flow of liquid to an exterior of the saw housing.

5. The saw of claim 2 , wherein the shelf protrudes inward from an interior surface of the first side at a shelf angle relative to the first side, and the shelf angle is an acute angle relative to a plane that includes the housing side outlet opening.

6. The saw of claim 2 , wherein the housing side outlet opening is disposed in the first side at a location that is longitudinally aligned with the motor.

7. The saw of claim 2 , wherein
each of the housing rear inlet opening and the housing side outlet opening comprises an array of slots, the material between the slots forming a grill configured to prevent material having dimensions greater than a width of the slot from entering the interior space, and
the shelf is disposed along an edge of the grill.

8. The saw of claim 1 , wherein the housing features comprise:
an upright wall portion that faces the housing outlet opening and is spaced apart from the housing outlet opening; and
a shelf that underlies the housing outlet opening and protrudes inward from the first side toward the upright wall portion.

9. The saw of claim 1 , wherein the housing features comprise wall portions disposed in the interior space, the wall portions arranged to provide a tortuous fluid path between at least one of the housing rear inlet opening and the housing side outlet opening and at least one of the motor and the printed circuit board assembly.

10. The saw of claim 9 , wherein at least a first one of the wall portions is parallel or substantially parallel to the longitudinal axis, and at least a second one of the wall portions is perpendicular to the first one of the wall portions.

11. The saw of claim 9 , wherein at least some of the wall portions are arranged to form an enclosed passage portion.

12. The saw of claim 9 wherein the housing features include a tubular baffle that forms a portion of a tortuous air flow path in the interior space.

13. The saw of claim 1 , wherein each of the housing rear inlet opening and the housing side outlet opening comprises an array of slots, the material between the slots forming a grill configured to prevent material having dimensions greater than a width of the slot from entering the interior space.

14. The saw of claim 1 , including a battery pack disposed in the interior space between the electric motor and the rear end, the battery pack configured to supply power to the electric motor.

15. The saw of claim 1 , wherein
the motor is housed within a motor housing,
the motor housing includes
a motor housing first end,
mounting bosses that are spaced apart about a circumference of the motor housing first end, the mounting bosses configured to receive a fastener, and
recesses that are formed in the motor housing first end such that one of the recesses is disposed between the mounting bosses of each adjacent pair of mounting bosses,

the output shaft protrudes from the motor housing first end, and
the housing features include a shielding wall portion that protrudes from an inner surface of the saw housing into one of the recesses, the shielding wall portion serving as a barrier to liquid flow through the recess.

16. The saw of claim 15 , wherein the shielding wall portion is shaped and dimensioned to complement the shape and dimension of the one of the recesses in such a way that motor housing and the shielding wall portion cooperate to inhibit the flow of liquid into the motor via the one of the recesses.

17. The saw of claim 15 , wherein the remaining recesses are free of a shielding wall portion.

18. The saw of claim 15 wherein the shielding wall portion protrudes from a rear-facing surface of the support arm.

19. The saw of claim 15 , wherein the housing outlet opening is longitudinally aligned with the shielding wall portion.

Assignees

• Bosch Gmbh Robert
• Robert Bosch Power Tools GmbH

Inventors

• Monteverde Richard
• Tam Ramon

Classifications

• B25F5/02

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

• B25F5/008

  Cooling means · CPC title

• B23D47/12

  of drives for circular saw blades · 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

• B23D45/16 Primary

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