Circular saws with pivot assemblies and pivot bias mechanisms

Patent metadata

Field	Value
Publication number	US-12420445-B2
Application number	US-202117919654-A
Country	US
Kind code	B2
Filing date	Jun 23, 2021
Priority date	Jun 25, 2020
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

Circular saws are disclosed herein. The circular saws include a cutting assembly, a base plate, a pivot assembly, and a pivot bias mechanism. The cutting assembly includes a motor and an arbor. The base plate defines an assembly-facing side and an assembly-opposed side. The pivot assembly operatively attaches the cutting assembly to the base plate. The cutting assembly and the base plate are configured to operatively rotate, relative to one another and about a pivot axis of the pivot assembly, to selectively vary a region of the circular saw blade that extends on the assembly-opposed side of the base plate. The pivot bias mechanism is configured to apply a linear force between the cutting assembly and the base plate in a linear bias direction that urges the cutting assembly and the base plate in opposed directions along the pivot axis.

First claim

The invention claimed is:

1. A circular saw, comprising:
a cutting assembly including:
(i) a motor including a motor shaft configured to rotate about a shaft rotational axis; and
(ii) an arbor configured to operatively attach a circular saw blade to the motor shaft and to rotate the circular saw blade about an arbor rotational axis when the arbor receives a torque from the motor via rotation of the motor shaft about the shaft rotational axis;
a base plate that defines an assembly-facing side and an assembly-opposed side;
a pivot assembly that operatively attaches the cutting assembly to the base plate such that the assembly-facing side of the base plate faces toward the cutting assembly, wherein the cutting assembly and the base plate are configured to operatively rotate, relative to one another and about a pivot axis of the pivot assembly, to selectively vary a region of the circular saw blade that extends on the assembly-opposed side of the base plate; and
a pivot bias mechanism configured to apply a linear bias force between the cutting assembly and the base plate in a linear bias direction that urges the cutting assembly and the base plate in opposed directions, the opposed directions extending along the pivot axis;
wherein the cutting assembly includes a cutting assembly bias mechanism mount, wherein the base plate includes a base plate bias mechanism mount, and further wherein at least one of:
(i) the cutting assembly bias mechanism mount is spaced apart from the pivot assembly; and
(ii) the base plate bias mechanism mount is spaced apart from the pivot assembly.

2. The circular saw of claim 1 , wherein the pivot assembly includes an elongate pivot rod.

3. The circular saw of claim 2 , wherein the elongate pivot rod defines a rod longitudinal axis that at least one of:
(i) is parallel to the pivot axis;
(ii) is collinear with the pivot axis;
(iii) is parallel to the arbor rotational axis; and
(iv) is perpendicular to a blade rotation plane within which the circular saw blade is configured to rotate.

4. The circular saw of claim 2 , wherein the pivot assembly further includes a pivot bearing configured to rotate about the pivot axis via rotation about the elongate pivot rod.

5. The circular saw of claim 4 , wherein:
(i) one of the cutting assembly and the base plate is directly attached to the elongate pivot rod;
(ii) the other of the cutting assembly and the base plate is indirectly attached to the elongate pivot rod via the pivot bearing.

6. The circular saw of claim 1 , wherein the pivot axis is parallel to the arbor rotational axis.

7. The circular saw of claim 1 , wherein the pivot bias mechanism at least one of:
(i) is in tension within the circular saw;
(ii) includes a tension spring;
(iii) is in compression within the circular saw;
(iv) includes a compression spring; and
(v) includes a resilient member.

8. The circular saw of claim 1 , wherein at least one of:
(i) the pivot bias mechanism is operatively attached to the cutting assembly bias mechanism mount and to the base plate bias mechanism mount; and
(ii) the pivot bias mechanism applies the linear bias force between the cutting assembly bias mechanism mount and the base plate bias mechanism mount.

9. The circular saw of claim 8 , wherein at least one of:
(i) the pivot bias mechanism is configured to pivot relative to the cutting assembly bias mechanism mount as the cutting assembly and the base plate operatively rotate relative to one another and about the pivot axis; and
(ii) the pivot bias mechanism is configured to pivot relative to the base plate bias mechanism mount as the cutting assembly and the base plate operatively rotate relative to one another and about the pivot axis.

10. The circular saw of claim 8 , wherein an overall distance between the base plate bias mechanism mount and the cutting assembly bias mechanism mount varies as the cutting assembly and the base plate operatively rotate relative to one another about the pivot axis.

11. The circular saw of claim 8 , wherein a pivot axis distance between the base plate bias mechanism mount and the cutting assembly bias mechanism mount, as measured along the pivot axis, is constant as the cutting assembly and the base plate rotate relative to one another about the pivot axis.

12. The circular saw of claim 1 , wherein the pivot bias mechanism is configured such that a relative orientation between the linear bias direction and the pivot axis varies as the cutting assembly and the base plate rotate relative to one another and about the pivot axis.

13. The circular saw of claim 1 , wherein the linear bias direction extends at least partially along the pivot axis.

14. The circular saw of claim 1 , wherein the circular saw further includes a rotation lock that defines a locked configuration, in which the rotation lock resists relative rotation of the cutting assembly and the base plate about the pivot axis, and an unlocked configuration, in which the rotation lock permits relative rotation between the cutting assembly and the base plate about the pivot axis.

15. The circular saw of claim 1 , wherein the circular saw is at least one of:
(i) a miter saw;
(ii) a chop saw; and
(iii) a bevel saw.

16. The circular saw of claim 1 , wherein the circular saw is a plunge saw, wherein the circular saw defines a leading region and a trailing region, wherein the leading region is configured to lead the trailing region as the circular saw is utilized to cut a workpiece, and further wherein the pivot assembly is positioned within the trailing region.

17. The circular saw of claim 16 , wherein the circular saw includes a plunge lock configured to be actuated, by a user of the circular saw and during operative use of the circular saw to cut the workpiece, to selectively permit the user to increase a depth-of-cut of the circular saw to plunge the circular saw into the workpiece.

18. The circular saw of claim 16 , wherein the circular saw includes a plunge biasing mechanism that urges relative rotation between the cutting assembly and the base plate toward a retracted orientation.

19. The circular saw of claim 1 , wherein the circular saw is a handheld circular saw, wherein the circular saw defines a leading region and a trailing region, wherein the leading region is configured to lead the trailing region as the circular saw is utilized to cut a workpiece, and further wherein the pivot assembly is positioned within the leading region.

Assignees

• Festool Gmbh

Inventors

• Spengler Wolfgang
• Werbach Martin

Classifications

• B27B5/30

  for mounting or securing saw blades or saw spindles · CPC title

• B27B5/32 Primary

  Devices for securing circular saw blades to the saw spindle · CPC title

• B23D47/02

  of frames; of guiding arrangements for work-table or saw-carrier · CPC title

• B27B9/02 Primary

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

• B27G19/04

  for manually-operated power-driven circular saws · CPC title