Miter saw with improved safety system

• US 20050178259A1
• Filed: 04/04/2005
• Published: 08/18/2005
• Est. Priority Date: 08/13/2001
• Status: Active Grant

• Current Assignee: Sawstop Holding LLC
• Original Assignee: SD3, LLC
• Inventors: Gass, Stephen F., Fulmer, J. David
• Granted Patent: US 7,353,737 B2
• Time in Patent Office: Days
• US Class Current: 83/397.100
• CPC Class Codes: B23D 47/08 of devices for bringing the circular saw blade to the workpiece or removing same therefrom
• CPC Class Codes: B23D 59/001 Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade measuring in general G01; controlling in general G05
• CPC Class Codes: B27B 13/14 Braking devices specially designed for band sawing machines, e.g. acting after damage of the band saw blade
• CPC Class Codes: B27B 5/38 Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing vibration-damping of sawing machines or devices working with circular saw blades B23D47/005
• CPC Class Codes: B27G 19/02 for circular saws
• CPC Class Codes: F16P 3/148 using capacitive technology
• CPC Class Codes: Y10S 83/01 Safety devices
• CPC Class Codes: Y10T 83/081 With randomly actuated stopping means
• CPC Class Codes: Y10T 83/089 Responsive to tool characteristic
• CPC Class Codes: Y10T 83/613 Work guard
• CPC Class Codes: Y10T 83/7697 Tool angularly adjustable relative to work-support
• CPC Class Codes: Y10T 83/7734 With guard for tool
• CPC Class Codes: Y10T 83/7788 Tool carrier oscillated or rotated
• CPC Class Codes: Y10T 83/8773 Bevel or miter cut

Abstract

A miter saw is disclosed having a base, a blade supported by the base, a detection system adapted to detect a dangerous condition between a person and the blade, and a reaction system associated with the detection system to cause a predetermined action to take place upon detection of the dangerous condition. The blade is rotatable, and moves into a cutting zone to cut a workpiece. The predetermined action may be to stop the blade from rotating, to create an impulse against movement of the blade into the cutting zone, or to cause the blade to move away from the cutting zone.

Claims

1. A miter saw comprising:

a base assembly defining a cutting zone;

a circular blade supported by the base assembly;

a motor configured to rotate the blade;

a housing assembly coupled to the base assembly and configured to at least partially enclose the blade, where the housing assembly includes a blade guard movable between an extended position relatively proximal the cutting zone and a retracted position relatively distal the cutting zone; and

a reaction system configured to detect one or more dangerous conditions between a person and the blade, and to urge the blade guard toward the extended position in the event a dangerous condition is detected.

2. The miter saw of claim 1, where the reaction system includes a brake mechanism configured to stop rotation of the blade, and where at least a portion of the brake mechanism is coupled to the blade guard.

3. The miter saw of claim 2, where the brake mechanism includes a cartridge removably attached to the blade guard.

4. The miter saw of claim 3, where the blade guard includes an exterior surface, and where the cartridge forms a portion of the exterior surface of the blade guard when the cartridge is attached to the blade guard.

5. The miter saw of claim 3, where the brake mechanism includes at least one braking element configured to engage the blade, and where the braking element is coupled to the cartridge.

6. The miter saw of claim 2, where the blade has angular momentum when rotating, and where the brake mechanism includes at least one braking element configured to engage the blade and to transfer at least a portion of the angular momentum of the blade to the blade guard.

7. The miter saw of claim 1, where the blade guard is configured to move around the perimeter of the blade.

8. The miter saw of claim 1, further comprising a linkage assembly connecting the blade guard to the base assembly, and where the housing assembly is selectively movable toward and away from the cutting zone, and where the linkage assembly is configured to move the blade guard toward the extended position when the housing assembly is moved away from the base assembly.

9. The miter saw of claim 1, where the reaction system includes a detection system configured to detect accidental contact between a person and the blade.

10. A miter saw comprising:

a base assembly defining a cutting zone;

a circular blade supported by the base assembly;

a motor configured to rotate the blade;

a housing assembly coupled to the base assembly and configured to at least partially enclose the blade, where the housing assembly includes a blade guard movable between an extended position relatively proximal the cutting zone and a retracted position relatively distal the cutting zone; and

a reaction system configured to detect one or more dangerous conditions between a person and the blade; and

means for urging the blade guard toward the extended position in the event a dangerous condition is detected.

11. A miter saw comprising:

a base assembly defining a cutting zone and configured to support workpieces in the cutting zone;

a housing assembly supported by the base assembly and selectively movable toward and away from the cutting zone, where the housing assembly includes at least one exterior surface;

a rotatable blade enclosed at least partially within the housing and configured to cut workpieces supported within the cutting zone;

a motor configured to rotate the blade; and

a brake mechanism configured to stop the rotation of the blade, where the brake mechanism includes a cartridge that is removably attachable to the housing assembly to form at least a portion of the at least one exterior surface.

12. The miter saw of claim 11, where the cartridge at least partially encloses one or more single-use components.

13. The miter saw of claim 11, where the housing assembly includes a first electrical connector, and where the cartridge includes a second electrical connector configured to operatively connect to the first electrical connector when the cartridge is attached to the housing assembly.