Actuators for power tool safety systems
AssigneeSawStop Holding LLC
InventorStephen F. Gass
Life of this patent
Estimating the term…
Abstract
Fast-acting and low-inertia actuators useable in various applications where a high force must be applied very quickly are disclosed. Power tools with detection systems configured to detect a dangerous condition between a person and a cutting tool are disclosed. In power tools, for example in a woodworking machine, a fast-acting and low-inertial actuator as disclosed herein can be used to retract a blade upon detection of a dangerous condition by a detection system. The actuator includes a charge of pressurized fluid and one or more electromagnets to selectively retain or release the pressurized fluid.
Claims8
A power tool comprising:
- a blade for cutting workpieces;
- a motor configured to drive the blade;
- a structure supporting the blade and configured to allow the blade to retract;
- and
- electromagnet means for triggering retraction of the blade.
A power tool comprising:
- a blade for cutting workpieces;
- a motor configured to drive the blade;
- a structure supporting the blade and configured to allow the blade to retract;
- and
- at least one electromagnet operable to trigger retraction of the blade, where retraction of the blade begins within 3 milliseconds after the electromagnet is operated to trigger retraction of the blade.
A power tool comprising:
- a blade for cutting workpieces;
- a motor configured to drive the blade;
- a structure supporting the blade and configured to allow the blade to retract;
- a first electromagnet to trigger a retraction of the blade;
- and
- a circuit to control the first electromagnet.
Dependencies are inferred from the claim text.