US1875692A - Binghald per alfbed andebsson - Google Patents

Description

P 1932- R. P. A. ANDERSSON 1,875,692

ARRANGEMENT FOR ELECTRIC iNCANDESCENT LAMPS Filed April 11. 1928 Patented Sept. 6, 1932 UNITED STATES ARRANGEMENT FOR ELECTRIC IN CANDESQENT' LAMPS Application filed April 11, 1928, Serial No.

This invention relates to an electric incandescent lamp with a plurality of filaments, provided with a switch for connecting the threads each separately or combined arbi- 5 trarily, which switch may be arranged inside 19 to be set by means of a rotatable disc or the, like outside the bottom plate of the lamp cap, whereby the lamp may be connected to usual holders for lamps with a single filament. The lamp may in a certain position be connected to a special holder, by means of which is made possible the connection of the filaments from a selecting current switch arranged on a wall or for instance by table lamps in the lamp holder.

Fig. 1 is a vertical central sectional View of the sleeve and base and contacts ofa lamp constructed and arranged in accordance with my invention and showing the filaments and conductors diagrammatically.

' Fig. 2 is a similar View of a modification of the same arranged for use with an Edison holder.

Fig. 3 is a diagrammatic plan of another modification of the invention.

Fig. l is a similar View of a holder of the same.

In the embodiment of my invention shown in Fig. 1, there is a sheet metal sleeve as usual, v

in one end of which the neck of the bulb is secured in the usual way. In the bottom contact 58 is turnably arranged a pin 59, which at the lower end ends in a collar 60, forming an abutment for one end of a helical spring 61' around the pin, the other end of which helical spring rests against the under side of the bottom. contact. On the exterior of the bottom contact the pin ends with a rotatable disc 62, to which is fastened a contact spring 63, which by the turning of the disc 62 can be brought into contact with either or both oftwo contacts 65, 66 passing through the bottom plate 64. Necessary contact pressure is caused by the spring 59. Conductingly connected as at 65a with one of the contacts, for instance 65, a contact ring 269,172, and in Sweden many as, ices.

67 is sunk into the bottom plate 64, which contactring isiconcentric-to the centre axis of the lamp. The filament is connectedfat one end to one end of the sleeve, as shown, and v a pair of filaments 6, 7, are connected to the other end of filament 5, filament 6 being connected to the contact and filament 7 being connected to contact 66. When the lamp is to be placed] in a special holder with con nection to a selector current switch the rotat able disc is to be set in such a way that the spring '63 rests against the contact 66 alone.

In the upper part of theholder shown in TENT o F CE f- Fig. 2, a plate 71 of porcelain or thelike is detachably" fastened. In the upper edge of a sheet metal cylinder 7 2 fastened to the plate 71", in which cylinder the'thread 73 intended for the lamp is made, is arranged a depres sion 74, in which a yielding contact tongue 75 is arranged, the lower yielding contact part of which, when the lamp is removed, has a slightly shorter centre distance than the contact ring 67 for causing the necessary contact pressure. The tongue 75 is fastened to the plate 71 and conductingly connected to one of three terminal screws 76, 77, 78 in connection with a selector current switch, namely to 76. The two remaining screws are connected in the usual way, one 77, to a contact disc 79 in the center on the under side of theplate 71, the other, 78, t0 the thread 73 or the like.

Figs. 3 and 4: show the bottom plate 50 of a lamp cap seen from inside and from outside respectively with another embodiment of the switch arranged at said plate.

On the inside of'said plate are two contacts 51 and 52, which are respectively connected with contact rings 53 and 54.- concentrically arranged on the outside of the bottom plate. A central shaft 55 extends through a central opening in the plate 50 and to said shaft'is attached a spring 56, which spring may be brought into or out of engagement with one or both of the contacts 51 and 52 by the turning of the shaft 55 by means of a disc 57 fastened to that part of the shaft 55 situated outside the plate 50. The connecting wires 6and 7 are connected to each one of the contacts 51, 52. Of course, the rotatable shaft may be substituted for a tube rotatable around a central pin, said pin being insulated from the tube by means of a bushing and connected with one of the contacts 51, 52, and the'contact rings being left out.

At the connecting of the lampin a special holder, the spring 56 is first set on that contact, which is not connected to the pin situated inside the tube.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

A lamp having a metalsleeve, a base, a bottom contact on the base, a pin rotatably journaled in the bottom contact "and provided at its free end with a collar forming an abutment, a helical spring on the pin bearingat one end against said abutment and at theother-end against the under side of the U bottom contact", a rotatable disc fast to the outer end of the pin and "having a contact spring, a pair of contacts extending through the base and each engageable by said contact spring, a contact ring arranged on the outer side of the base and electrically connected to-one of said contacts and a plurality of filamy name.

ments each having one end connected to the sleeve and the other end connected to one of the first named contacts. 7

In witness whereof, I have hereunto signed RINGHALD'PER ALFRED ANDERSSON.

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