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US 4,794,273 AGranted
On/off control system for power operated hand tools
AssigneeFood Industry Equipment International, Inc.
InventorsTimothy J. McCullough, Arvin B. Simon
Life of this patent
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AssigneeFood Industry Equipment International, Inc.
InventorsTimothy J. McCullough, Arvin B. Simon
Estimating the term…
An electronic ON/OFF control system for use on a powered hand tool to ensure operator safety and ease of operation. The hand tool is driven either by an electric motor driven, flexible drive shaft or a source of pressurized air supplied to the hand tool through a supply line. A low power frequency is applied alternately to the hand tool and power supply line. Appropriate circuitry detects changes in the frequency of the applied signal caused by an operator grasping the hand tool and power supply line and the sequence in which the two components are grasped. If the hand tool is being grasped when the drive shaft or supply line is subsequently grasped a signal is supplied to a power control unit which actuates the power source for the hand tool. The power control unit maintains the hand tool energized after releasing of the operator's grasp on the on the power supply line and automatically de-energizes the hand tool upon the operator releasing his grasp on the hand tool.
A control system for a power operated hand tool which is connected to a power source by a power supply line extending between the power source and the hand tool, said system including:
A method for actuating and deactivating a power driven hand tool which is connected to a power source by a power supply line by a user grasping the hand tool and power supply line in a predetermined sequence, said method including the steps of:
An improved meat trimming knife of the type having a handpiece with a ring-shaped cutting blade rotatably mounted on a front end thereof, said blade being rotated by a power source remote from the handpiece and connected thereto by a power supply line, said knife including a pair of electrical conductor means extending through the power supply line and terminating at two separate locations adjacent the handpiece for alternatively transmitting a low power frequency to said locations;
An improved ON/OFF control system for a power operated hand tool which is connected to a power source by a power supply line, said system including a pair of electrical conductor means extending through the power supply line, at least one of said conductors terminating within the hand tool;
Dependencies are inferred from the claim text.