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.

Abstract: A flashlight is equipped with rechargeable batteries inside its main housing. A removable tail cap contains an electronic circuit for recharging the batteries, the circuit being actuated and energized by means of a switch assembly which is accessible through the outer end of the tail cap.A mechanical isolation means is included for protecting the electronic circuit from being damaged by any physical movement of the batteries that may occur.One embodiment of the invention also includes a spare bulb holder assembly which also constitutes the mechanical isolation means.

Abstract: A flashlight assembly including a cylindrical housing defining a battery compartment and a separated lamp compartment with a circuit controlling switch located entirely on the outside of the cylindrical enclosure, the lamp compartment lying in a separate part of the cylindrical enclosure which is threadedly connected to the main portion of the enclosure, there being an electrical connector between the switch unit and the lamp and socket unit which extends from the switch on the outside of the enclosure to the interior of the lamp compartment and remains entirely outside the battery compartment.