Variable focus flashlight

Details Variable focus flashlight Variable focus flashlight

1981-12-04

1983-08-09

Lechert, Jr., Stephen J.

Illumination

Self powered lamp

With movable focusing element

362202, 362280, 362306, 362319, F21L 700

Patent

active

043982387

ABSTRACT:
A variable focus flashlight has a cylindrical flashlight body and a separate flashlight head which is threadedly secured to the body. A bulb is supported in fixed relation to the body, and a reflector is supported in fixed relation to the head. Rotation of the head changes its longitudinal position relative to the body, hence moving the reflector either forwardly or rearwardly relative to the bulb and thereby adjusting the focus of the flashlight beam.
In order to retain the selected focus adjustment, an expansible spring is disposed partly inside the flashlight body and partly inside the flashlight head, the corresponding ends of the spring being seated in respective ones of those members. The expansive force of the spring biases the interengaging threads of the flashlight head and body, producing a substantial frictional force so as to retain the desired rotational position of the head.
To facilitate desired adjustments, at least one end of the expansible spring is provided with a seat which permits relatively free lateral or rotational movement of the associated spring end.

REFERENCES:
patent: 2097222 (1937-10-01), Tompkins et al.
patent: 2173650 (1939-09-01), Fullmer
patent: 2273360 (1942-02-01), Kidder
patent: 4286311 (1981-08-01), Maglica

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