Power tool for forming a channel in a work surface and accessories therefor

Patent metadata

Field	Value
Publication number	US-12521909-B2
Application number	US-201916725390-A
Country	US
Kind code	B2
Filing date	Dec 23, 2019
Priority date	May 24, 2019
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

A power tool for forming a channel in a work surface includes a first section carrying a rotatable shaft having a shaft axis and a second section that engages the work surface; a cutting disc having a substantially circular blade provided on the rotatable shaft; a first support portion on one side of the cutting disc and a second support portion on the opposite side of the cutting disc which cooperate to hold the cutting disc at an oblique angle relative to the shaft axis. A first locking feature of the first support portion and a second locking feature of the second support portion extend through a circular opening of the cutting disc and cooperate to resist relative rotation of the first and second support portions. The first section is movable relative to the second section to move the cutting disc into and out of engagement with the work surface.

First claim

We claim:

1 . A power tool for forming a channel in a concrete work surface comprising:
a first section carrying a rotatable shaft extending along a shaft axis; a cutting disc having a substantially circular blade provided on the rotatable shaft by receiving the rotatable shaft through a circular opening of the cutting disc; a first support portion on one side of the cutting disc and a second support portion on the opposite side of the cutting disc,
the first support portion having a first end surface perpendicular to the shaft axis and an opposing non-parallel second end surface,
the second support portion having a first end surface perpendicular to the shaft axis and an opposing non-parallel second end surface,
the first and second support portions cooperating to hold the cutting disc at an oblique angle relative to the shaft axis,
each of the second end surfaces of the first and second support portions having a plurality of first locking features and second locking features, respectively,
the plurality of first locking features of the first support portion and second locking features of the second support portion extend through and are spaced about the circular opening of the cutting disc whereby such locking features cooperate to resist relative rotation of the first and second support portions,
wherein the plurality of first locking features of the first support portion comprise a first set of projections and the plurality of second locking features of the second support portion comprise a second set of projections;
a second section for engaging the work surface, the first section being movable relative to the second section such that the cutting disc can be moved into and out of engagement with the work surface in use, wherein an active portion of the periphery of the cutting disc, being the part of the periphery furthest from the rotatable shaft in the direction of the work surface, oscillates along an axis parallel to the shaft axis when the rotatable shaft rotates.

2 . The power tool of claim 1 , wherein the plurality of first locking features of the first support portion interlock with the plurality of second locking features of the second support portion to resist relative rotation of the first and second support portions.

3 . The power tool of claim 1 , wherein the first and second support portions each have a rear surface distal from the cutting disc and at least two of the first set of projections have different lengths and at least two of the second set of projections have different lengths.

4 . The power tool of claim 1 , wherein at least two of the first set of projections have different lengths along a direction parallel to the rotatable shaft.

5 . The power tool of claim 1 , wherein each of the first and second sets of projections are circumferentially arranged.

6 . The power tool of claim 1 , wherein the first and second support portions each have a mass, and
wherein the first support portion has a mass greater on a first side of the rotatable shaft and the second support portion has a mass greater on a second side of the rotatable shaft, wherein the second side is opposite the first side.

7 . The power tool of claim 6 , wherein the first and second support portions each define a fin, wherein in use the fin of the first support portion is located on an opposite side of the rotatable shaft to the fin of the second support portion.

8 . The power tool of claim 7 , wherein the thickness of the fin of the first support portion varies along the length thereof and the thickness of the fin of the second support portion varies along the length.

9 . The power tool of claim 1 , wherein the first and second support portions each comprise an opening through which the first and second support portions are mounted to the rotatable shaft.

Assignees

• Black & Decker Inc

Inventors

• Märte Robin
• Lauer Arthur
• Miebach Robert

Classifications

• B23D47/12

  of drives for circular saw blades · CPC title

• B23D61/10 Primary

  clamped between hubs; Clamping or aligning devices therefor · CPC title

• B28D1/183

  Hand tools, e.g. portable, motor driven · CPC title

• B27B5/36 Primary

  Mounting for swivelling or tilting the circular saw blade {, e.g. using an adjustable mounting (slotting or mortising machines B27F5/02)} · CPC title

• B28D1/121

  Circular saw blades · CPC title