US3300675A

US3300675A - Electric incandescent lamp filament support

Info

Publication number: US3300675A
Application number: US357211A
Authority: US
Inventors: Deshaw Zoltan
Original assignee: Individual
Current assignee: Individual
Priority date: 1964-04-03
Filing date: 1964-04-03
Publication date: 1967-01-24
Anticipated expiration: 1984-01-24

Description

Jan. 24, 1967 z. DESHAW 3,300,675

ELECTRIC INCANDESCENT LAMP FILAMENT SUPPORT Filed April 5, 1964 FIG. 7.

United States Patent M 3,300,675 ELECTRIC INCANDESCENT LAMP FILAMENT SUPPORT Zoltan Deshaw, 18 St. James Mansions, London, England Filed Apr. 3, 1964, Ser. No. 357,211 2 Claims. (Cl. 313-274) This invention relates to electric incandescent filament lamps of strip form.

In referring to strip-form lamps I mean lamps of generally tubular form, along the length-wise direction of which the filament extends. Such lamps include strip lamps with contacts at opposed ends of the tube, and so called tubular and other lamps having the contacts at one end, the filament in this case extending from one electrode, along the tube in one direction and then back again to the other electrodes.

Hitherto the ends of the filament in line filament tubular lamps have been connected to conductive wires which are attached to the end of a filament supporting spine, e.g., a glass rod, and provide end pole-pieces onto which the electrodes projecting from the electrode mounts at the opposed ends of the lamp tube are connected. In manufacture the end pole-pieces are connected to the spine, the filament is connected in place between the pole-pieces, and the electrodes on the two electrode mounts are then connected to the pole-pieces prior to insertion of the assembly into the tubular lamp envelope, sealing of the electrode mounts to the tube, exhausting of the lamp and fitting of the lamp caps.

An object of this invention is to simplify the manufacture.

Another object of the invention is a strip-form electric incandescent filament lamp in which the line filament is connected directly to the electrodes.

A further object of the invention is a strip form electric incandescent filament lamp in which a supporting spine for the line filament is directly supported by the lamp electrodes.

These and other objects of the invention will be apparent from the following description of particular embodiments thereof which are shown by way of example in FIGURES 2 and 3 of the accompanying drawings, which figures show one end portion of a double-ended tubular lamp and one end portion of a single-ended tubular lamp respectively. FIGURE 1 of the drawings shows one end portion of a double-ended tubular lamp constructed in the manner usual before the present invention.

In the known double-ended filament lamp (FIGURE 1) the line filament 1 is connected at its ends to wire pole-pieces 2 attached to the ends of a glass rod 3 constituting a filament-supporting spine. Only one end portion of the lamp is shown: the other end is identical. For attaching the pole-pieces 2 to the rod 3, an end portion of each pole-piece is formed into a coil 2a and the wire convolutions are caused elastically to grip the rod 3. Between its ends, the filament 1 is supported by the rod 3 through the agency of filament support wires 4 which at one end are anchored in the rod 3 and at the other end are pigtailed about the filament. The inner end of each electrode 5 is bent over and this bent end of the electrode is engaged around the pole-piece 2 at the corresponding end of the filament.

In the lamp illustrated by FIGURE 2 the use of separate pole-pieces between the electrodes and filament is dispensed with. The portion of each electrode 5 projecting inwardly from the electrode mount is formed, short of 3,300,675 Patented Jan. 24, 1967 the electrode end, into a coil 5a which is caused to grip the rod 3. The free end portion of the electrode extends normally to the rod and the corresponding end of the filament 1 is connected directly to the electrode extremity.

The lamp illustrated in FIGURE 3 is a single-ended tubular lamp with two

electrodes

5, 6 made from fairly hard nickel wire. One of the lamp electrodes (electrode 5) is formed for supporting one end of the rod 3 as in the lamp shown in FIGURE 2, and is directly connected to one end of the lamp filament 1. The second electrode (electrode 6), extends along the interior of the rod 3 (which is hollow) from the lamp cap, and beyond the remote end of the rod the electrode is formed into a loop 6b shaped to nest into the conical end of the lamp envelope. Nearer its extremity the electrode 6 is formed into a coil 6a which grips the corresponding end of the rod 3 and the end portion of the electrodes extending from the coil 6a forms a pole-piece to which the corresponding end of the filament 1 is directly connected. The loop 6b which is formed from the resilient nickel wire, helps to avoid vibration of the mounted filament.

As compared with lamps according to FIGURE 1, the mounting of the filaments illustrated in FIGURES 2 and 3 is much easier and more secure since the jointing of the electrodes to separate pole-pieces as by welding or hooking, is obviated. Not only is the manufacture simplified, but the electrical connection between electrodes and filament and the mechanical support of the electrodesupporting spine member are improved.

It is to be understood that the embodiments hereinbefore described are illustrative only and various alternative constructions are possible within the scope of the invention as defined by the appended claims. In particular it is mentioned that the lamp according to FIGURE 3 could be modified by extending the end of the spine which is remote from the end cap, into contact with the adjacent end portion of the lamp envelope so that this envelope supports that end of the spine, in which case the electrode 6 need not be formed for supporting that spine end.

What I claim is:

1. An electric incandescent lamp having a generally tubular envelope, an end cap at one end of said envelope, a filament extending along the interior of said envelope, an electrically insulating filament support comprising a tubular spine, a first electrode extending from said cap and into engagement with the nearer end of said spine so as to support such spine away from said envelope while leaving an end portion of such electrode projecting from said spine, which end portion is directly connected to one end of said filament, and a second electrode extending from said cap, along the interior of said spine, and into contact with the said envelope and the end of said spine which is remote from said end cap thereby to support that spine end away from said envelope while leaving an end portion of said second electrode which projects laterally from said spine and is directly connected to the other end of said filament.

2. An electric incandescent lamp having an elongated generally tubular envelope, an end cap on said envelope, a filament extending along the interior of said envelope, electrodes each having its outer end connected to said end cap and its inner end connected directly to the nearer end of said filament, and a longitudinal filament-supporting spine carrying filament-supporting wires which support said filament at a predetermined position between its 3 4 ends, said electrodes being formed intermediate their ends 2,087,759 7/1937 Gaidies 313204 X into coils which surround the end portions of the spine 2,424,457 7/1947 Haynes et a1 313-288 X and support it in spaced relation to the lamp envelope. 2,425,864 8/ 1947 Cartun 313-285 X References Cited by the Examiner 5 FOREIGN PATENTS 1,061,120 11/1953 France. UNITED STATES PATENTS 1,140,716 5/ 1957 France.

988,416 4/1911 Welsh 313374 1,885,431 11/1932 Grow 313 284 X JOHN W- HUCKERT, Prlmarw Exammer- 1,993,829 3/1935 Chapman 313274 10 A. J. JAMES, Assistant Examiner.

Claims

1. AN ELECTRIC INCANDESCENT LAMP HAVING A GENERALLY TUBULAR ENVELOPE, AN END CAP AT ONE END OF SAID ENVELOPE, A FILAMENT EXTENDING ALONG THE INTERIOR OF SAID ENVELOPE, AN ELECTRICALLY INSULATING FILAMENT SUPPORT COMPRISING A TUBULAR SPINE, A FIRST ELECTRODE EXTENDING FROM SAID CAP AND INTO ENGAGEMENT WITH THE NEARER END OF SIAD SPINE SO AS TO SUPPORT SUCH SPINE AWAY FROM SAID ENVELOPE WHILE LEAVING AN END PORTION OF SUCH ELECTRODE PROJECTING FROM SAID SPINE, WHICH END PORTION IS DIRECTLY CONNECTED TO ONE END OF SAID FILAMENT, AND A SECOND ELECTRODE EXTENDING FROM SAID CAP, ALONG THE INTERIOR OF SAID SPINE, AND INTO CONTACT WITH THE SAID ENVELOPE AND THE END OF SAID SPINE WHICH IS REMOTE FROM SAID END CAP THEREBY TO SUPPORT THAT SPINE END AWAY FROM SAID ENVELOPE WHILE LEAVING AN END PORTION OF SAID SECOND ELECTRODE WHICH PROJECTS LATERALLY FROM SAID SPINE AND IS DIRECTLY CONNECTED TO THE OTHER END OF SAID FILAMENT.