US1775187A - Multiple-filament lamp - Google Patents

Description

- Sept. 9, 1930.

E. BONDIEK 1,775,187

MULTIPLE FILAMBNT LAMP iled Nov. 25. 1927 26 x ZZ \\I x Q. 79 24 x avwemto'c irmesf Eonoliek Patented Sept. 9, 1930 PATENT OFFICE ERNEST BONDIEK, F GUTTENBERG, NEW

MULTIPLE-FILAIEENT LAMP Application filed November 25, 1927. Serial No. 235,529.

My invention relates to improvements in incandescent electric lamps or light bulbs in which a pair of filaments or a double filament is used allowing to utilize a new fila- 6 ment if one is ruptured or burnt out, or a lamp which at times, when it is desirable to have a very bright light, allows to increase the intensity of the light produced by a single bulb by utilizing both filaments,

and it is the principal object of my invention to produce these effects by a single manipulation of the light bulb.

Another object of my invention is the provision of a lamp of this'character which is extremely simple in its construction and therefore inexpensive and which produces a great saving in material, as well as in labor.

A further object of my invention is the provision of an incandescent electric lamp which may be used for a relatively along period, which may be readily manipulated by anybody, even persons not skilled in the art, to disconnect one of the filaments from the circuit for remaining inactive while the other is active or to connect both filaments in the energized circuit if it is desired to increasethe intensity of the light produced by the bulb by a simple turn of the bulb. This is particularly desirable in bulbs for electric sign boards, where it will simply be necessary if one filament is broken to turn the lamp farther into its socket to make the lamp glow again, without the necessity of exchanging the bulbs, this resulting in a great saving of labor and material.

It will be evident that by designing the lamp for heavy or high wattage, each filament may be for instance of 100 watt intensity, and thus, when both filaments are ener- 49 gized a 200 watt bulb will be provided. This is naturally cited as an example only,

as evidently any desired and suitable watt in-" tensity from the lowest to the highest possible may be employed.

Moreover, the two filaments may be of equal or unequal resistance according to use of the lamp for domestic or home illumination, or for instance in cars or the like, and if one of the filaments is of low resistance,

the lamp may be used for night lamp service,

guided through the base.

while it may be used for reading etc., purposes by simply cutting both filaments in through screwing the lamp base entirely into the lamp socket.

These and other objects and advantages of my invention will become more fully known as the description thereof proceeds and will then be more specifically defined in the appended claims.

In the accompanying drawing forming a material part of this disclosure Fig. 1 is a side elevation of the electric light or lamp bulb constructed according to my. invention, and illustrating an exterior view of the same.

Fig. 2 is a sectional view of the light bulb, part of'which is broken away to lllustrate its interior construction. I

As illustrated, the lamp com rises a bulb 10 of any desired shape and co or or trans parency which is hermetically sealed in the usualmanner andcementedtoits base 11. The outer metallic shell or screw contact is designated 12, and is made in two parts, the upper one being separated from the lower part 13 by means ofan insulated portion 14, and a similar art of insulating material 15 is provide on top'of the base and shell.

The sleeve 16 is embedded in the, solid end ofthebase and has a central opening into which movably engages a contact member 17 having a flanged lower end 18 for holding and -ding member 17 in the sleeve and for limiting its outward movement. This memberis adapted-to engage the central contact of a lamp socket.

The upper end of the filament 19 connected with. the positive pole of a light socket, is formed into a spiral leader 2O electrically or conductively connected at its end, as at 21, and the end of the filament connected to the negative pole, designated 22 is conductively connected to the shell 12, as at 23, after being A second fila' """nt 24 is connected to the filament 19 and is guidedgupwardly through part of the base and conductively connected to part 13 of the shell,as at 25.

It will be clear'that the filaments illustrated on the drawing are intended to illusread on hand of the drawing and it will be evident that by screwing the bulb in the usual well known manner into a lamp socket so that contact member 17 just engages the socket contact and shell 12, only is in contact with the socket walls, a circuit will be closed over the socket contact through filament 19, filament 22 to shell 12, and only this filament will glow.

If this filament is ruptured, the lamp bulb I need simply be turned to press member 17 inwardly and compress the spiral or helical leader, while shell-part 13 of the shell comes into' contact with the socket wall, the circuit will be closed over filament 19, filament 24 and shell-part 13, and filament 24 will glow.

It will be clear that both filaments will be energized to glow, if the shell is entirely screwed into the lamp socket at the beginning, when bothfilaments are intact.-

It is to be understood, that I have shown and described as an example of the many possible ways to practically construct my lamp bulb, the preferred form thereof, and that I may make such changes in the general arrangement and in the construction of the minor details, as come within the scope of the appended claims without departure from the spirit of my invention and the principles involved.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is 1. The combination withan electric lamp provided with a plurality of filaments, of a base and its shell, said shell having separate portions insulated from each other to which certain of said filaments are connected at one end, a sleeve projecting from the said base, said sleeve having an end wall provided with a spring contact member movably held in said sleeve, 2 flange at the inner end of said contact member for limiting the outward movement of the same, and a means connected to the other end of said filaments within said sleeve and contact member for ensuring a conductive contact between said member and a lamp socket in all positions of said base and its shell in said socket.

2. The combination with an electric lamp provided with two filaments, of a base and its metallic shell, said shell adapted to be screwed into a lamp socket, and having separate portions insulated from each other to which said filaments are connected at one end, a sleeve projecting from saidbase, said sleeve havingan end wall providedwith 3.

spring contact member movably held within said sleeve for vertical displacement therein, and a flange at the inner end of said contact member for limiting the outward movement of said member, and a coil formedat the end of the other of said filaments tending to press

Images