Miter saw with double belt drive

Patent metadata

Field	Value
Publication number	US-9555490-B2
Application number	US-201113226198-A
Country	US
Kind code	B2
Filing date	Sep 6, 2011
Priority date	Sep 6, 2011
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

A miter saw includes a base, a turntable, a support assembly, and a cutting arm. The turntable is rotatably connected to the base, and the support assembly fixedly extends from the turntable. The cutting arm is pivotally connected to the support assembly. The miter saw further includes an arbor assembly, a gear assembly, a first belt member, and a second belt member.
The arbor assembly is rotatably supported by the cutting arm. The gear assembly is supported by the cutting arm and positioned outside of a nominal blade space of the miter saw. The first belt member is operatively connected to the arbor assembly and the gear assembly. The second belt member is operatively connected to the gear assembly and to a motor shaft.

First claim

What is claimed is:

1. A miter saw having a circular saw blade, comprising:
a base;
a turntable rotatably connected to said base;
a support assembly fixedly extending from said turntable;
a cutting arm pivotally connected to said support assembly and defining a width;
an electric motor mounted on said cutting arm and including a motor shaft, said electric motor configured for movement with said cutting arm;
an arbor assembly rotatably supported by said cutting arm and defining an axis of rotation, said arbor assembly configured to support the circular saw blade for rotation about said axis of rotation;
a gear assembly supported by said cutting arm, configured for movement with said cutting arm, and positioned entirely outside of a nominal blade space of the circular saw blade of said miter saw;
a first belt member operatively connected to said arbor assembly and said gear assembly; and
a second belt member operatively connected to said gear assembly and to said motor shaft,
wherein said nominal blade space is a cylindrical volume centered about said axis of rotation, defining a diameter at least as large as a diameter of the circular saw blade, and
wherein said gear assembly causes said first belt member to run at a different speed than a running speed of said second belt member and/or said gear assembly causes said first belt member to run in a different rotational direction than a rotational direction of said second belt member.

2. The miter saw of claim 1 , wherein said motor shaft is positioned outside of said nominal blade space.

3. The miter saw of claim 1 , wherein the gear assembly includes:
a primary shaft rotatably supported by said cutting arm,
a first gear member fixedly mounted on said primary shaft,
a secondary shaft rotatably supported by said cutting arm,
a second gear member fixedly mounted on said secondary shaft and configured to meshingly engage said first gear member.

4. The miter saw of claim 3 , wherein the gear assembly further includes:
a first pulley member fixedly mounted on said primary shaft, and
a second pulley member fixedly mounted on said secondary shaft.

5. The miter saw of claim 4 , wherein:
said first gear member has a first gear diameter,
said second gear member has a second gear diameter, and
said first gear diameter is unequal to said gear second diameter.

6. The miter saw of claim 4 , wherein:
said first belt member is engaged with said first pulley member, and
said second belt member is engaged with said second pulley member.

7. The miter saw of claim 1 , wherein:
said support assembly includes a support arm fixedly extending from said turntable and a bevel arm pivotally connected to said support arm,
said cutting arm is pivotally connected to said bevel arm.

8. A miter saw, comprising:
a base;
a turntable rotatably connected to said base;
a support assembly fixedly extending from said turntable;
a cutting arm pivotally connected to said support assembly and defining a width;
a circular saw blade defining a nominal blade space;
a motor supported by said cutting arm and including a motor shaft, said motor located entirely outside of said nominal blade space;
an arbor assembly rotatably supported by said cutting arm and defining an axis of rotation, said arbor assembly configured to support said circular saw blade for rotation about said axis of rotation;
a gear assembly supported by said cutting arm, configured for movement with said cutting arm, and positioned entirely outside of said nominal blade space;
a first belt member operatively connected to said arbor assembly and said gear assembly; and
a second belt member operatively connected to said gear assembly and to said motor shaft,
wherein said nominal blade space is a cylindrical volume centered about said axis of rotation, defining a diameter at least as large as a diameter of said circular saw blade, and
wherein said gear assembly causes said first belt member to run at a different speed than a running speed of said second belt member and/or said gear assembly causes said first belt member to run in a different rotational direction than a rotational direction of said second belt member.

9. The miter saw of claim 8 , wherein the gear assembly includes:
a primary shaft rotatably supported by said cutting arm,
a first gear member fixedly mounted on said primary shaft,
a secondary shaft rotatably supported by said cutting arm, and
a second gear member fixedly mounted on said secondary shaft and configured to meshingly engage said first gear member.

10. The miter saw of claim 9 , wherein the gear assembly further includes:
a first pulley member fixedly mounted on said primary shaft, and
a second pulley member fixedly mounted on said secondary shaft.

11. The miter saw of claim 8 , wherein:
said support assembly includes a support arm fixedly extending from said turntable and a bevel arm pivotally connected to said support arm, and
said cutting arm is pivotally connected to said bevel arm.

Assignees

• Cox Matthew Donel
• Bosch Tool Corp
• Bosch Gmbh Robert

Inventors

• Cox Matthew Donel

Classifications

• Y10T83/7693

  Tool moved relative to work-support during cutting · CPC title

• B23D45/044 Primary

  the saw blade being adjustable according to angle of cut (B23D45/025 takes precedence) · CPC title

• B23D47/12

  of drives for circular saw blades · CPC title