Hand held adjustable focus flash light

Illumination – Self powered lamp – With movable focusing element

Patent

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Details

362158, 362183, 362205, 362207, F21L 700, F21L 900

Patent

active

051710862

ABSTRACT:
In a first embodiment, a combination "ON", "OFF" and "DIRECTIONAL SWITCH" operates to turn the light the light on and off and operate a electric motor to drive the lamp longitudinally to facilitate a change of light beam focal length. In a second embodiment, a combination "ON", "OFF" and "DIRECTIONAL SWITCH" operates to turn the light on and off and to manually translate the light bulb longitudinally to facilitate a change of light beam focal length. In both of the embodiments the beam focal length is adjustable through an infinite number of positions between maximum and minimum translation limits and the flashlight maintains the selected light beam focal length until a different light beam focal length is selected. In each embodiment a replacement bulb is contained within the body of the flashlight and is external removable therefrom.

REFERENCES:
patent: 1608195 (1926-11-01), Barany
patent: 1823763 (1931-09-01), Rathmann
patent: 1902377 (1933-03-01), Rosenberg
patent: 2107599 (1938-02-01), Chan
patent: 2516993 (1950-08-01), Holt
patent: 2945944 (1960-07-01), Gillespie
patent: 3196268 (1965-07-01), Mack
patent: 4388673 (1983-06-01), Maglica
patent: 4527223 (1985-07-01), Maglica
patent: 4680682 (1987-07-01), Parker
patent: 4843526 (1989-06-01), Price, III
patent: 4916588 (1990-04-01), Chu
patent: 4949231 (1990-08-01), Wang
patent: 4987523 (1991-01-01), Lindabury et al.

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