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Remote-safety-switch

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Remote safety switch

Details

Inventors: Aga, Steven M.;
Assignee:
Primary Examiner: Roskoski; Bernard
Assistant Examiner:
Attorney, Agent or Firm: Ptak; LaValle D.

A foot operated safety switch, preferably including an electronic control reset circuit, is connected between a source of electrical current and the power cord of an electrically operated device having an on/off switch on it. The safety switch operates as an off-only device and cannot be used to turn on the device once it has been operated to turn the device off. To reoperate the device, the on/off switch on the device first must be turned off and then turned backon. This reset necessity also is incorporated into the system to prevent the device from being automatically turned back on after it has been turned off by a power failure.

DETAILED DESCRIPTION It is an object of this invention to provide an improved safety control switch for electrical devices.
It is an additional object of this invention to provide an improved remote emergency cut-off switch for power tools and machines.
It is another object of this invention to provide an improved remote emergency off-only, cut-off switch for power tools and machines.
It is a further object of this invention to provide a remote foot-activated, electronic, emergency, off-only, cut-off switch for power tools and machines.
It is yet another object of this invention to provide a remote foot-activated, electronic, emergency cut-off switch located between the power supply connection for the tool and an electrical source, in which the cut-off switch is used as an off-only switch incapable of turning on the tool or machine controlled by it.
In accordance with a preferred embodiment of this invention, a safety switch system is provided for a power operated device having an on/off switch for connecting and disconnecting the device from a source of power.
The safety switch has first and second states of operation and is connected in series between the source of power and the power supply connection for the on/off switch of the device to turn off power from the source of power to the device in the first state of operation of the safety switch, and to permit power from the source of power to be supplied to the device when the safety switch is in its second state of operation.
A reset circuit is responsive to the condition of operation of the on/off switch and is coupled with the safety switch to prevent the resupplying of power from the source of power to the device when the safety switch is operated from its first state of operation to its second state of operation until the on/off switch is subsequently operated from its off position to its on position.
Consequently, once the safety switch is operated, the on/off switch first must be switched from its "on" position to its off position and then back again to resume operation of the device

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