US2050438A

US2050438A - Electric guide lamp

Info

Publication number: US2050438A
Application number: US753285A
Authority: US
Inventors: Ludwig Louis
Original assignee: Individual
Current assignee: Individual
Priority date: 1934-11-16
Filing date: 1934-11-16
Publication date: 1936-08-11
Anticipated expiration: 1953-08-11

Description

Aug. 11, 1936.

1.. LUDWIG 1 ELECTRIC GUIDE LAMP Filed Nov. 16, 1954 INVENTOR. lav/ s Z udw/y A TTORNEYS.

Patented Aug. 11, 1936 UNITED STATES PATENT OFFICE 1 Claim.

The invention relates to electric lamps and has for its main object to provide a lamp of very small size which can be employed as a guide ligh and inserted directly in an electric outlet, and which can be so manipulated as to intensely illuminate a small area or to less intensely illuminate a larger area. Another object is to provide a lamp of this kind with means whereby it may be clamped or secured to various objects and connected by wires to an outlet, when such outlet is not in a place where it is desired to use the lamp.

A further object is to provide a lamp of attractive appearance, which is extremely simple in its construction, which can be manufactured at a very low cost, and which can be put to a very great many uses.

These and various other objects and advantages may be readily understood from the following description and from the accompanying drawing of preferred embodiments in which, however, modifications may be made without departing from the scope of the appended claim. In the drawing Fig. 1 is a side view of the guide lamp,

Fig. 2 a cross-sectional plan view,

Fig. 3 an end view,

Fig. 4 another end view,

Fig. 5 a side elevation of the lamp shown attached to a clamping member, and

Fig. 6 a bottom view showing certain details of construction employed in the embodiment shown in Fig. 5.

Referring now to Figs. 1, 2, 3 and 4, the device consists of a hollow, cylindrical body member ID in one end of which a threaded shell II is inserted. The bottom of this shell is provided with an insulating washer I2. Another insulating washer I3 is inserted in the other end of the body member and this washer is provided with two rectangular openings through which the prongs I4 and I5 pass. The prong I4 is provided with an angular member I6 and through this member and the washer l3 a bolt I1 passes. A nut I8 on the end of the bolt clamps the threaded shell II, as well as the washer I3 in place, as plainly shown in Fig. 2. An elongated, cylindrical bulb I9 is inserted in the shell II and on this bulb a shade 20 is mounted. This shade is provided with fingers 2| which are riveted to the shade by a rivet 22 and are free to slide longitudinally on the cylindrical part of the bulb.

The prong I5 extends some distance into the body member and is secured to it by a shouldered bushing 23. A hole 24 in this bushing is threaded and a screw 25, provided with an insulating knob 26, is free to turn in this thread. The end of the screw 25 engages against a spring 21 which is riveted to the prong I5. When the knob 26 is turned the spring 21 engages with the threaded shell II. Thus when the prongs are inserted in an outlet box the current will flow through prong I5, shell II, through the shell of the lamp, through the lamp and back from the center contact 28 of the lamp, through the bolt IT, to the prong I4.

While I prefer to employ the spring 21 to engage the threaded shell II, it is evident that, by moving the switch up farther towards the bulbend of the lamp body as shown in Fig. 5, the spring may be omitted and the end of the screw 25 be made to engage directly with the shell II.

When the lamp is inserted in an outlet, the area around the box which is illuminated by the bulb will depend upon the position of the shade in relation to the bulb. When the shade is in the position shown in Fig. 2 a relatively small circular area, of a relatively high intensity will be illuminated, while when the shade is in the position shown in Fig. 1 a much larger area, but

of much lesser intensity, will be illuminated.

In Fig. 5 the prongs have been eliminated and the lamp shown secured to a clamp 29. In this case the lamp may be clamped to any object that it is desired to illuminate and the cord 30, which contains the wires 3| and 32, connected to the outlet. The wires 3| and 32 are secured to the binding screws 33 and 34. The binding screw 33 is connected to the bolt I! by a metal contact 35, while the binding screw 34 is connected to a metal contact 36 which extends upward in the housing and which is riveted to the lamp body by the bushing 23, as previously explained. The lamp is secured to the clamp by means of screws 31 and 38 which engages in holes 39 and 40 drilled and tapped in the washer I3. All the other parts are numbered as in Figs. 1 to 4.

Having. described my invention and its objects, what I claim is new and wish to protect by Letters Patent is:

An electric lamp of the class described comprising a tubular body member; a lamp socket, having an outwardly extending flange at its open end, inserted in one end of the body member with the flange in engagement with the end of the body member; an interior shoulder formed in the other end of the body member; an insulating washer inserted in the body member against said shoulder; a pair of attachment prongs extending outwardly from said washer; one of said prongs secured to the washer by means of a bolt which also clamps the lamp socket and the washer in the body member and which forms the center contact of the lamp socket; the other prong secured to the body member; a spring member secured to the last-mentioned prong; and a switch handle for engaging and disengaging said spring member with the metal shell of the lamp socket.

LOUIS LUDWIG.