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Direct plug in power tool using single pair of contacts for both AC and DC currents

  • US 5,998,965 A
  • Filed: 04/13/1998
  • Issued: 12/07/1999
  • Est. Priority Date: 04/13/1998
  • Status: Expired due to Term
First Claim
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1. A cordless power tool having a battery module containing a battery, and a motor module containing a d.c. motor, the improvement comprising:

  • first and second mating plug units, each having two terminals, mounted on the battery and motor modules, respectively, the first mating plug unit comprising a pair of male terminals and the second mating plug unit comprising a pair of female terminals for receiving said male terminals; and

    means for placing the male terminals of the first plug unit (i) in an a.c. mode when unplugged from the second plug unit so as to be enabled to conduct a.c. current from an a.c. power main to charge said battery and (ii) in a d.c. mode when plugged to the second plug unit so as to be enabled to conduct d.c. current from the battery to the motor via the second plug unit terminals.

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