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Lighting device with dynamic bulb position

  • US 4,339,788 A
  • Filed: 08/15/1980
  • Issued: 07/13/1982
  • Est. Priority Date: 08/15/1980
  • Status: Expired due to Term
First Claim
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1. A portable, self-contained lighting device comprising a head assembly containing the bulb, bulb positioned means, reflector, switch, electrical contact components and a body assembly with provisions for holding a power source in electrical contact with certain elements of the head assembly, wherein(a) a rotating switch assembly is positioned in a handle remote from the head/body assembly substantially directly above the bulb, and(b) an electrical contact strip(1) is preloaded against the switch assembly in the "off" position,(2) has an over-travel capacity of up to about 50%,(3) has a compensating flexible knee capable of changing by up to about 40°

  • , and(4) has a flexed bulb restrictor element which engages the bulb at the bulb base and imparts an axial force on the bulb generally away from the reflector core,(c) the bulb is housed in a two-pronged, U-shaped bulb retainer that is slidably mounted in slots adjacent the reflector core which engages the bulb terminal at its base and cooperates with the bulb restrictor and the central power source terminal spring to change the position of the bulb axially depending on the presence of the power source, and(d) a circular electrical contact disc secured to said head assembly at its perimeter with(1) a central aperture for allowing the central power source terminal spring to contact the base of the bulb retainer, and(2) a contact rim that engages the electrical contact strip in the general area of the compensating flexible knee.

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