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US 8,051,758 B2Granted
Injury mitigation system for power tools
AssigneeRobert Bosch GmbH
InventorErin F. Eppard
Life of this patent
Estimating the term…
Abstract
A power tool comprises a detection system for detecting a situation where an operator using a power tool of the type which has an exposed rotating component contacts the rotating component, and a protection system for minimizing the possibility of an operator being injured by contacting the rotating component.
Claims4
A detection system for a power tool having a rotating component and a trigger that is depressed by a user to operate the power tool, comprising:
- an optoisolator circuit configured for isolating a high voltage input from a power supply at a first part of the power tool, and for applying a lower voltage to a trigger plate mounted on said trigger, said trigger plate being configured to be in contact with a user during operation of the power tool to provide a differential in voltages on the power tool;
- a sensor configured for sensing a voltage drop on said trigger plate of the power tool when the user contacts the rotating component;
- wherein when said sensor senses said voltage change for a predetermined duration, said sensor emits an actuating signal to actuate a solenoid or a relay.
Dependencies are inferred from the claim text.