Variable focusing flashlight

Details Variable focusing flashlight Variable focusing flashlight

1990-03-27

1990-10-30

Dority, Carroll B.

Illumination

Self powered lamp

With movable focusing element

362205, 362203, F21L 700

Patent

active

049673254

ABSTRACT:
A flashlight includes a flashlight head assembly, a barrel, and a lamp base. The lamp base is fixed inside the head assembly and is rotatably engaged to the barrel. When the head assembly is rotated relative to the barrel, a flashlight bulb fixed to said lamp base moves axially away from or towards a lens attached to the head assembly, thus varying the focusing distance of the bulb. The barrel serves as a contact between the negative terminal of a battery and a terminal end of the flashlight bulb. A second terminal end of the flashlight bulb is connected to an elastic spring whose base is fixed on a metal post. The rotation of the head assembly relative to the barrel can accordingly compress or expand the elastic spring. The elastic spring can thus urge the metal post to contact the positive terminal of the battery.

REFERENCES:
patent: 4725932 (1988-02-01), Gammache
patent: 4819141 (1989-04-01), Maglica et al.

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