US2032232A

US2032232A - Incandescent lamp and method of manufacture the same

Info

Publication number: US2032232A
Application number: US622268A
Authority: US
Inventors: Royal F Strickland
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1932-07-13
Filing date: 1932-07-13
Publication date: 1936-02-25
Anticipated expiration: 1953-02-25
Also published as: BE397484A; FR758121A; GB403323A

Description

Feb. 25, 1936. R. F. STRICKLAND 2,032,232

INCANDESCENT LAMP AND METHOD OF MANUFACTURING THE SAME 2 Sheets-Shet 1 Filed July 13, 1932 my r IAZ-VENTUR ROYAL F STRZ'EKLAN-D,

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.lllllllllll IIIIIIII I Feb. 25, 1936. R. F. STRICKLAND INCANDESCENTLAMP AND METHOD OF MANUFACTURING THE Filed July 13 193? 2 Sheets-She t 2 JAR/ENTER Ea YAL .F. Srarczcz AND,

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20 and the description which follows of a Patented Feb. 25, 1936 PATENT OFFICE INCANDESOENT LAMP AND METHOD OF MANUFACTURING'THE SAME Royal F. Strickland, Cleveland Heights, Ohio, assignor to General Electric Company, a corporation of New Ycrk Application July 13, 1932, Serial No. 622,268

Claims. (01. 176-32) My invention relates to bases for electric incandescent lamps and similar devices. More par-. ticularly my invention relates to such devices having bases which are comprised of insulating 5 material molded directly thereon and are provided with metallic contact areas or terminals.

. Previous bases of this type usually incorporated relatively large terminal portions. .In some cases i this was due to the fact that the insulating material was rather brittle and required protection. In some cases metallic paste or paint coatings served for the terminals. My invention on the other hand contemplates terminals consisting of bodies of metal as distinct from such coatings. One object of my invention is to provide an efiicient base comprising parts of small size and low cost but of great durability as compared with previous bases. Other objects and advantages of my invention will appear from the drawings species thereof.

In the drawings Fig. 1 is a perspective view of b Fig. 5 isa perspective view of another species of my invention; Figs. 6, 8 and 10 are vertical sections through a portion of still other species of my invention; and Figs. '7, 9 and 11 are horizontal sections along lines 66, 8-8, and Ill-l ll respectively of the species shown in Figs. 6, 8 and 10.

In the specific embodiment of my invention shown in Fig. 1, the base comprises collar Ill and a substantially cylindrical portion II with oppositely disposed lateral ridges l2 extending longitudinally thereof. These portions are all formed from the molded material which is preferably composed principally of a synthetic resin, a hardening compound and a filler such as marble flour or the like. There are a number of such synthetic resins such as Bakelite. One such synthetic resin is commercially known as Durite which is a furfural or phenol formaldehyde product. This substance is preferred for its resistance are contact areas or terminals l3'c0nnected to a hardening compound such as hexamethylenefilament H and, in the species shown in Fig. 1, are exposed portions of the leads l5 which are suitably bent preferably into loops. When the base is inserted into a socket is, shown in Fig. 2, the contact areas are engaged. by spring contact fingers I'l in longitudinal grooves 18 in the socket which guide the ridges l2 into position and the cylindrical portion ll of the base is snugly engaged by a correspondingly shaped portion of the socket. Sockets of this type have sufficient grip upon the base to keep the lamp from being shaken out. A V

' My method of molding the species shown in Fig. 1 consists, as shown in Figs. 3 and 4, in first bending the outer ends is of the leading-in wires into the form shown and placing the lamp in holder 28. The holder is provided with a sponge rubber facing it so as to engage all portions of the irregular shaped bulb 22. The mold 23 is then brought down into contact with the bulb in such a position that the leading-imwires will be properly placed in the mold whereupon the required amount of molding material is inserted into passage 26 and is pressed into all portions of the mold by plunger 25. The'mold is now heated, preferably to 0., until the base material has taken a permanent set whereupon the bulb holder 2B is removed and the completed based lamp removed from the mold. In order to prevent breakage of the bulbs, a molding pressure of from fifteen to one hundred and fifty pounds per square inch is used, which is sufficient for the molding material used. With this method of manufacture the base terminals are sections of the leading-in wires each of which is bent into the looped form shown. This provides the two oppositelydisposed terminals and serves also to resist displacement during the molding process.

Also included within the scope of my invention are the other forms of my base shown in remaining Figs. 5 to 11 which comprise separate terminals united to the leads. The inserts 26, as

inserts differs in that said wires are soldered or welded thereto before the base is molded. In

' method of attaching the leading-in wires to the the iorm shown in Figs. and 11, the leadingin wires are clamped to the insert by bending tongue 21 thereabout, as shown, before molding.

What I claim as new and desire to secure by Letters Patent of the United States is:

the said enclosure and avbase consisting of an insulating substance molded on said enclosure and having embedded therein the ends of said lead wires, said base having at least one longitudinally extending protuberance at the side thereof formed from said insulating material and having a portion of one of saidlead wires exposed at the surface thereof to constitute a terminal.

2. An electrical device consisting of a glass enclosure having an electric energy translation element mounted therein and lead wires connected to said element and extending through the said enclosure and a base consisting of an insulating substance molded on said enclosure and having embedded. therein the ends 01 said lead wires, said base having at least one longitudinally extending protuberance at the side thereof formed from said insulating material and having a terminal body exposed at the surface thereof having electrical connection to one of said lead wires.

I 3. An electrical device consisting 01' a glass en closure having an electric energy translation element mounted therein and lead wires connected to said element and extending through the said enclosure and a cylindrical base consisting of enclosure having anelectric energy translation element mounted therein and lead wires, connected to said element andiextending through the said enclosure and a cylindrical base consisting of an insulating substance molded on said enclosure and having embedded therein the ends'of said lead wires, said base having at least one longitudinally extending ridge at the P side thereof formed from said insulating material.

and having a portion of a lead wire exposed and extending along a portion. of the surface thereof to constitute a terminal.

5. An electrical device consisting of a glass enclosure having an'electric energy translation element mounted therein and lead wires.connected to said element and extending through said enclosure, and a base consisting of an insulating substance molded on said enclosure and having embedded therein the ends of said lead wires, said base having at least one longitudinaily extending protuberance at the side thereoi, and the embedded end of a lead wire being bent into an angular loop extending outward from the wall of said enclosure and having its midportion exposed at the surface of said protuberance to constitute a'terminal. ROYAL 1". 'BTRICKLAND.