Abstract: A flashlight includes a tube; a control ferrule with an inner helical groove being rotatably disposed on the front portion of the tube; a face cap with a lens and a reflector being provided on the front end of the front portion; and one or more batteries being disposed within the tube. A socket with two conductors respectively connected to two prongs of a light bulb is slidably disposed within the front portion of the tube. A pin couples the socket to the control ferrule so that the socket is guided to move along the guide holes of the tube by the relative movement between the pin and the control ferrule. A sleeve is disposed on one end of a tail cap for engaging into a rear end of the tube. A small gap separates the sleeve and the tail cap. A spring member is disposed between the tail cap and the battery so as to urge the tail cap not to electrically connect to the tube.

Abstract: A miniature flashlight including a cylindrical tube enclosed at a rear end by a tail cap, a control ferrule rotatably connected to a front end of the cylindrical tube, and a face cap with a lens and a reflector threadedly engaged at a front end of the control ferrule. One or more batteries are disposed within said tube, and a spring member is located between the tail cap and the adjacent battery. A guide means is disposed within the fron end of the tube. A slidable socket is threadably connected within the control ferrule in order to be pushed along a longitudinal axis of the tube. Two resilient blades are disposed in the slidable socket with one end of the first resilient blade slidably contacting the guide and one end of the second resilient blade contactable with an anode of a foremost battery. A light bulb is plugged into said slidable socket. The sliding movement of the slidable socket brings the end of the second blade into contact with the anode of the foremost battery.