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Electrical current actuated accessory outlet

  • US 5,541,457 A
  • Filed: 06/12/1995
  • Issued: 07/30/1996
  • Est. Priority Date: 06/12/1995
  • Status: Expired due to Fees
First Claim
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1. An electrical current actuated accessory outlet for allowing an electrical auxiliary device such as a shop vacuum to be operated simultaneously and automatically in connection with an electrical tool such a saw comprising, in combination:

  • a rigid device box having an open top and a cover removably secured over the top;

    a sheathed power cable having a positive lead, a neutral lead, a proximal terminal end extended within the housing, and a distal three-pronged polarized grounded plug end extended from the housing and securable to a polarized grounded socket of an electrical receptacle of a remote electrical power source for receiving a source of alternating current therefrom; and

    an electric circuit disposed within the device box and with the electric circuit including;

    a first power transformer having a primary coil and a secondary coil and with the primary coil thereof coupled to the positive lead of the power cable for receiving the source of alternating current,an electrical receptacle having a three-pronged polarized grounded accessory outlet and a three-pronged polarized grounded tool outlet with each outlet further extended outwards through the cover of the device box and with the accessory outlet mateable with a plug end of an electrical accessory device and the tool outlet mateable with a plug end of the electrical tool, the accessory outlet coupled to the neutral lead of the power cable and the tool outlet coupled to the primary coil of the first power transformer and the neutral lead of the power cable;

    a first full wave rectifier formed of two diodes for transforming the source of alternating current into a first source of direct current, each diode of the first rectifier having a positive end and a neutral end and with the positive ends of the diodes coupled to the secondary coil of the first transformer and the neutral ends of the diodes coupled together at a common junction, each diode further having a resistor and a capacitor coupled in parallel therewith for mitigating fluctuations in the first source of direct current;

    a second power transformer having a primary coil and a secondary coil and with the primary coil thereof coupled to the positive lead and the neutral lead of the power cable,a second full wave bridge rectifier formed of four interconnected diodes for transforming the source of alternating current into a second source of direct current and with the second rectifier having a capacitor coupled in parallel therewith for mitigating fluctuations in the second source of direct current,a first relay having a switching coil coupled to the second rectifier and a pair of switching contacts coupled between the positive lead of the power cable and the accessory outlet of the electrical receptacle and with the switching contacts of the first relay further having a capacitor coupled in parallel therewith for reducing current arcing during switching,a second relay having a switching coil coupled to the common junction of the second rectifier and a pair of switching contacts coupled between the switching coil thereof and the switching coil of the first relay,a power transistor having a gate terminal coupled to the common junction of the first wave rectifier, a drain terminal coupled to one of the switching contacts of the second relay, and a source terminal coupled to the switching coil of the first bridge rectifier, anda single pole single throw switch coupled in parallel with the switching contacts of the first relay and having a toggleable portion extended outwards from the cover of the device box, the switch having an open orientation for allowing the source of alternating current to be delivered to the tool that is plugged into the tool outlet and to thus cause the sources of direct current to flow through the transistor and effect closure the switching contacts of the first relay, thereby allowing delivery of the source of alternating current to the auxiliary device that is plugged into the accessory outlet, the switch further having a closed orientation for allowing the source of alternating current to be delivered to the accessory outlet for operation of the auxiliary device independently of the operation of the tool that is plugged into the tool outlet.

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