referring to the drawing , the instrument comprises of an elongated hollow electrically conducting metal cylinder 10 having an internally threaded end portion 12 and a second threaded end 13 . a cylindrical light transmitting lens element 14 is provided with a thread 15 which mates with thread 13 . a cavity 16 receives a light bulb 18 , sleeve 19 of the bulb makes electrical contact to metal cylinder 10 through metal disc 20 in which the sleeve 19 sits in a contact relationship . the outer end of the lens 14 is provided with a roughened face surface so that the light transmitted through the body of the lens is directed outwardly . this is a characteristic of many light transmitting resins such as polymethylmethacrylate . on the other hand , the end of the lens may be polished in the shape of a concave disc so as to direct the light forward . at the center of the lens a bore 22 is provided , preferably of a tapered configuration , for receiving tapered shanks 23 of tools 24 . in order to energize the incandescent lamp , two batteries 25 , 25 &# 39 ; in series such as shown in fig4 may be employed wherein the positive contact 26 of the forward battery 25 &# 39 ; makes contact with the center contact 27 on the bulb 18 and the conventional negative terminal of the rearward battery 25 makes contact to spring 28 connected to threaded metal portion 30 and , in turn , to the case 10 . within knob 32 there is provided a switch ( shown schematically ) and actuated by contact button 34 . in fig2 however , there is shown a battery simulator of fig4 which consists of a non - conductive tube 40 which terminates in a metal contact button 42 having a central portion 44 surrounded by insulation 46 . one lead runs from member 42 to one side of the secondary 47 of transformer 48 , shown schematically . another lead is connected to metal terminal member 50 through a rheostat 52 , which permits adjusting the voltage applied to the bulb whereby the intensity of the illumination provided may be varied . the primary 54 of transformer 48 is connected through a conventional power cord 56 and plug 58 , to a conventional source of line current . thus , it will be appreciated , that the apparatus may be used either with batteries or from an ac source . mounted onto the elongated metal cylinder 10 , there is provided a housing 60 , which contains a drive wheel 62 extending to the side of the instrument , whereby the user holding the instrument in his hand can readily actuate the device , the drive wheel , with his thumb . on a common shaft with the drive wheel 62 there is provided a pinion 64 which engages a rack 66 , which lies in a groove 68 in the housing 60 . shaft 70 terminates at both ends in a ball configuration which is secured by ball joint clamping means 72 and 74 , permitting adjustment of the magnifying means 76 , attached to member 72 to be adjusted to any desired configuration or position . while there have been shown and described and pointed out the fundamental novel features of the invention as applied to a preferred embodiment thereof , it will be understood that various omissions and substitutions and changes in the form and details of the device illustrated and in its operation may be made by those skilled in the art without departing from the spirit of the invention . it is the intention , therefore , to be limited only as indicated by the scope of the claims appended hereto .
a hand tool having integral work area illumination means and magnifying means capable of being held and adjusted by one hand of the user . the apparatus may be powered by internal batteries or from an external source by means of an adapter .