US2688711A

US2688711A - Electric lamp

Info

Publication number: US2688711A
Application number: US242900A
Authority: US
Inventors: Camillerapp Marcel Marie
Original assignee: Individual
Current assignee: Individual
Priority date: 1951-08-21
Filing date: 1951-08-21
Publication date: 1954-09-07
Anticipated expiration: 1971-09-07

Description

Sept. 7, 1954 M. M. CAMILLERAPP ELECTRIC LAMP 2 Shee ts-Sheet 1 Filed Aug. 21, 1951 INVENTOR. WM mm Sept. 7, 1954 M. M. CAMILLERAPP ELECTRIC LAMP 2 Sheets-Sheet 2 Filed Aug. 21 1951 INV ENTOR. "lWWMAw wffl Patented Sept. 7, 1954 UNITED STATES PATENT OFFICE 2,688,711 ELECTRIC LAMP Marcel Marie Camillerapp, Petit Quevilly, France Application August 21, 1951, Serial No. 242,900

Claims. (Cl. 313--276) The object of the present invention is an improvement to incandescent electric lamps, the purpose of such improvement being to preserve the filament against shocks,trepidations or vibrations.

According to a first characteristic of the invention, a unit presenting a certain mass and constituted by the filament, its holding wires and an insulating holder, is fixed at the free end of two or several flexible wires stems, the other end of which is fixed in the lamp base, some ones of these Wires stems being liable to be used as conductors for connecting the filament to the source of voltage.

According to another characteristic of the invention, some wire stems can be made of an e1as-' v tic metal, other ones being constituted of a non elastic metal able to produce a damping of vibrations.

According to a further characteristic of the invention, the wire stems can be nearly rectilinear or be folded or bent, for example like a zigzag or a helix, so as to be endowed of a great flexibility with small overall dimensions.

The invention will be better understood with the help of the following description, with reference to the annexed drawings, in which:

Figure 1 shows in perspective an example of a lamp according to the invention.

Figure 2 represents in elevation a unit similar to that of Figure 1, fixed upon two flexible wire stems welded into the base according to the invention.

Figure 3 shows a first modified embodiment in which the wire stems arerolled in zigzag, and

Figure 4 shows a second modified embodiment in which the wire stems are Wound as a helix.

- Referring at first to Figure 1, an insulating rod is seen in I, including three beads 2, 3, 4; the molybdenum hooks 5 commonly used to hold the filament 6, are pricked into the bead 2. Theinput connections which hold the filament ends are constituted by metallic arms I and 8 having a certain stiffness; they are pricked into the bead 3 and may be bent as shown in the figure, in order to bring their free end in the filament plane. In this bead 3, another arm 9 is also provided which is also connected to a convenient point on fila ment 6. In this arrangement, the lamp may work with two different current intensities or be fed with polyphase current. Additional fixing

arms

20, 2 I, and 22 are connected to bead 4 and project therefrom. In this embodiment, three wire stems 23, 24, and 25 are provided which are fastened at their lower ends in base I2, and connected at H their upper ends respectively to fixing

arms

20, 2|, and 22 and arms I, 8, and 9. In the embodiment shown, the sealings of the three wire stems in base I 2 are arranged in a straight line, but these sealings may be otherwise arranged such as in triangular form.

The Figure 1 embodiment is of particular value in the case of rather powerful lamps. In this way, a triangular arrangement is obtained, which from a mechanical point of view is endowed with all the advantages belonging to that geometrical form, particularly an overall elasticity more symmetrical with respect to the lamp axis.

In Figure 2 is shown the device for fastening the filament support. The example represented refers to an embodiment in which two wire stems It and I I are used simultaneously as electrodes; they are inserted into the pinched part 12 of the glass foot in a known manner, and are fastened by tightening or welding in i3 and I4 on the holding arms I5 and I6; the arms I? and I8 pricked into the bead l9 are also joined by welding or any other means to the wire stems If! and I respectively. The fastening of the filament support is so secured as to prevent it from rocking about the points I3 and M.

The filament support is so fastened at the end of a flexible unit, the metallic wire stems I0 and II being elastic, and this device produces a damping of the vibrations which occur perpendicularly to the lamp axis.

The above described arrangements are generally convenient, namely for lamps whose dimensions are ratherimportant. However, they are not as Well adapted to lamps of reduced power or to those which, by their purpose, should present limited overall dimensions. The modified types according to Figures 3 and 4 can then be used.

Referring at first to Figure 3, a lamp is seen in perspective, whose glass bulb is in I and the cap is in 2. Two metallic wires 5 and 6 folded like a zigzag as shown, are sealed in the pinched part 4 of the base; two conducting angle arms I and 8 are fixed, for example by welding, at their respective ends; besides these arms are pricked in the first bead 9 of a stem II), the latter being made of a plastic insulating material such as glass. The free ends of these angle wires support the ends of the filament I3 maintained inproper position by holding wires I2 pricked into a second bead I I of the stem II]. The wire stems 5 and 6 extend through the foot by conductors l4 and I5 which, according to the usual arrangement are ending to contact terminals I6 and I1.

Referring to Figure 4, the same elements are seen as in Figure 3, and pointed out by the same reference numbers, but the wire stems 5 and 6 are rolled like a helix, the general arrangement remaining the same.

It is easy to understand the advantages of the modified embodiment according to Figures 3 and 4. In the arrangements represented in both figures, the units constituted by the stem 10, the angle wires I and 8, the filament l3 and its holding wires [2, present a certain mass which is supported by the wire stems 5 and 6; the latter, by reason of their shape, have a great flexibility; however, the encumbrance in length, along the axis of the lamp, is very reduced.

It is understood that the constructional forms represented, constitute only examples. The wire stems 5 and 6 might be folded or rolled in other curves than those shown, according to the requirements of the manufacture or of the use.

Moreover the details of making could vary. The lamp cap, the shape of the arms 7 and 8 as well as the various attaching or welding ways may be any method whatever. The connections 14 and 45 may be the extensions of the wire stems 5 and 6 themselves, or conductors added and welded in any point whatever of these wire stems; the latter ones might also act only as mere holders, the current being fed to the filament through auxiliary conductors.

A number of Wire stems 56 different from two, might also be used, as in the embodiment of Figure 2; for example, three'might be provided, some of them might be made of a nonelastic annealed metal, in order to damp the oscillations.

It is obvious that the nature of the materials used should be chosen according to the usual requirements of the technics. The folded or rolled wire stems could be, for example, of nickel, molybdenum or tungsten; steel wires could also be used, preferably nickeled or chromed if the lamp contains a gaseous atmosphere, so as to avoid every contamination of the gas.

What I claim is:

1. An incandescent lamp comprising, in combination, a glass bulb; a stem arranged in the walls of said glass bulb; at least three metallic flexible wire rods seal d at one end thereof to said stem; an insulating support mounted at the other ends of said flexible metallic wire rods so as to be carried thereby; two metallic arms supported by said insulating support and connected to two of said wire rods, said arms consisting of metal and being rigid; a plurality of hooks supported by said insulating support; and a filament having two ends electrically and mechanically connected to said arms, respectively, said filament being arranged so as to traverse said hooks supporting the same whereby said filament, said arms and said hooks form a unit to which current is supplied by said two wire rods and which is supported by said insulating support.

2. An incandescent lamp comprising, in combination, a glass bulb; a stem arranged in the walls of said glass bulb; at least three metallic flexible wire rods sealed at one end thereof to said stem; an insulating support mounted at the other ends of said flexible metallic wire rods so as to be carried thereby; two metallic arms supported by said insulating support and connected to two of said wire rods, said arms consisting of metal and being rigid; a plurality of hooks supported by said insulating support; and a filament having two ends electrically and mechanically connected to said arms, respectively, said filament being arranged so as to traverse said hooks supporting the same whereby said filament, said arms and said hooks form a unit to which current is supplied by said two Wire rods and which is supported by said insulating support, at least one of said wire rods consisting of an elastic metal whereas the other of said wire rods consists of a nonelastic metal.

3. A lamp as claimed in claim 1, said glass bulb being gas-fi11ed; and a metallic layer arranged on said wire rods, said metallic layer protecting said wire rods against the chemical action of the gas filling said glass bulb.

4. An incandescent lamp comprising, in combination, a glass bulb; a stem arranged in the walls of said glass bulb; at least three metallic flexible wire rods sealed at one end thereof to said stem; an insulating support mounted at the other ends of said flexible metallic wire rods so as to be carried thereby; a plurality of metallic arms supported by said insulating support and connected to a plurality of said wire rods, said arms consisting of metal and being rigid; a plurality of hooks supported by said insulating support; and a filament electrically and mechanically connected to said arms, respectively, said filament being arranged so as to traverse said hooks supporting the same whereby said filament, said arms and said hooks form a unit to which current is supplied by at least two of said wire rods and which is supported by said insulating support.

5. An incandescent lamp comprising, in combination, a glass bulb; a stem arranged in the walls of said glass bulb; at least three metallic flexible wire rods sealed at one end thereof to said stem; an insulating support mounted at the other ends of said flexible metallic wire rods so as to be carried thereby; a plurality of metallic arms supported by said insulating support and connected to a plurality of said wire rods, said arms consisting of metal and being rigid; a plurality of hooks supported by said insulating support; and a filament electrically and mechanically connected to said arms, respectively, said filament being arranged so as to traverse said hooks supporting the same whereby said filament, said arms and said hooks form a unit to which current is supplied by said at least two of wire rods and which is supported by said insulating support, at least one of said wire rods consisting of an elastic metal whereas another of said wire rods consists of a nonelastic metal.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,856,247 Gustin May 3, 1932 2,238,598 Powell Apr. 15, 1941 2,497,566 Stone Feb. 14, 1950