Patents Assigned to Nicholl Brothers, Inc.
  • Patent number: 4342953
    Abstract: A battery protection circuit particularly for portable lamps employing rechargeable batteries is provided to prevent overdischarge of the batteries and includes a bulb drive transistor connecting a bulb across the battery with a switch interposed between one side of the battery and the bulb, a voltage sensing resistor connected to one side of the switch, a regenerative switch connected between the sensing resistor and the other side of the battery, and the regenerative switch including an output terminal connected by a base resistor to the base of the drive transistor. The regenerative switch includes a pair of transistors connected and cooperating such that when one of the transistors is turned on, the other is caused to be turned on, the transistors, further, maintaining each other on. As the dropout voltage of the battery is approached, the base drive of the drive transistor decreases which causes the bulb to become dim to thereby warn of the discharged state of the battery.
    Type: Grant
    Filed: May 2, 1980
    Date of Patent: August 3, 1982
    Assignee: Nicholl Brothers, Inc.
    Inventor: John J. Collins
  • Patent number: 3944761
    Abstract: A finger-actuated rotary switch adapted for use in electric devices, such as lanterns, and operative to select a desired light or light combination wherein the rotary switch is a waterproof structure and includes an elongated rotatable stem extending through a stator and having a switch rotor retained on one end thereof. The switch rotor is in engagement with the stator and relative movement between the switch rotor and the stator is effective to move the switch rotor into and out of engagement with electrical contact heads extending from the stator all in response to movement of cam followers which extend from the switch rotor and move along and in engagement with a cam surface on the stator. The switch rotor is resiliently maintained in engagement with the stator. A support is positioned between the stator and an operating knob on the stem.
    Type: Grant
    Filed: November 29, 1974
    Date of Patent: March 16, 1976
    Assignee: Nicholl Brothers, Inc.
    Inventors: Thomas H. Nicholl, John J. Collins