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US 6,813,983 B2Granted
Power saw with improved safety system
AssigneeSd3, LLC
InventorsStephen F. Gass, David A. Fanning
Life of this patent
Estimating the term…
Abstract
A miter saw having a base and an arm that pivots toward the base is disclosed. A blade is supported by the arm, and is designed to cut workpieces resting on the base when the arm and blade pivot downward. The saw includes a detection system configured to detect one or more dangerous conditions between a person and the blade, such as when a person accidentally touches the spinning blade, and the saw includes a reaction system to urge the arm and blade away from the base when the dangerous condition is detected.
Claims20
A miter saw comprising:
- a base assembly defining a cutting zone and configured to support workpieces in the cutting zone;
- a pivot arm coupled to the base assembly and selectively moveable toward and away from the cutting zone;
- a motor assembly;
- a rotatable arbor supported by the pivot arm and driven by the motor assembly;
- a rotatable blade mounted on the arbor and configured to cut workpieces supported within the cutting zone;
- a detection system configured to detect one or more dangerous conditions between a person and the blade;
- and
- reaction means for urging the pivot arm away from the base assembly upon detection by the detection system of the one or more dangerous conditions;
- where the reaction means includes a brace member and retraction means for gripping the brace member and for urging the pivot arm upward away from the base assembly when the detection system detects the one or more dangerous conditions between a person and the blade;
- where the brace member is coupled to the tilt mechanism and the retraction means;
- and where the retraction means is coupled to the pivot arm.
8 more elements
A miter saw comprising:
- a base assembly defining a cutting zone and configured to support workpieces in the cutting zone;
- a pivot arm coupled to the base assembly and selectively moveable toward and away from the cutting zone;
- a tilt mechanism between the base assembly and the pivot arm, where the tilt mechanism is configured so that the pivot arm may tilt relative to the base assembly;
- a motor assembly;
- a rotatable arbor supported by the pivot arm and driven by the motor assembly;
- a rotatable blade mounted on the arbor and configured to cut workpieces supported within the cutting zone;
- a detection system configured to detect one or more dangerous conditions between a person and the blade;
- and
- a reaction system configured to urge the pivot arm away from the base assembly upon detection by the detection system of the one or more dangerous conditions;
- where the reaction system comprises a brace member and a retraction assembly;
- where the brace member is coupled to the tilt mechanism and the retraction assembly;
- where the retraction assembly is coupled to the pivot arm;
- and where the retraction assembly is configured to grip the brace member and urge the pivot arm upward away from the base assembly when the detection system detects the one or more dangerous conditions between a person and the blade.
10 more elements
Dependencies are inferred from the claim text.