US2107903A

US2107903A - Method of manufacturing an electric device

Info

Publication number: US2107903A
Application number: US705067A
Authority: US
Inventors: Leo R Peters
Original assignee: General Electric Co
Current assignee: General Electric Co
Priority date: 1934-01-03
Filing date: 1934-01-03
Publication date: 1938-02-08
Anticipated expiration: 1955-02-08
Also published as: FR783626A

Description

Feb. s, 1938 IL.'R.PEITERS METHOD OF MANUFACTURING AN ELECTRIC DEVICE Filed Jan. 3, 1954 IN VENTUR LEQBFETERE Patcnted Feb. 8, 1938 METHOD or MANUFACTURING AN TRIO DEVICE ELEC Leo Peters, Garfield Heights,- Ohio, assignor to General Electric Company, a corporation of I New York ApplicationJanuary 3, 1934, Serial No. 705,067

2 Claims.

My invention relates to electric incandescent lamps and similar devices comprising an electric energy translation element, such as a filament,

mounted on leading-in wires and sealed in a bulb. More particularly my invention relates to an improved joint or connection between the energy translation element and the leading-in wires in suchdevices and to the method of manufacture thereof. 7

Considerable trouble has been experienced with so called miniature incandescent lamps such as those used in flashlights due to irregularity of performance. Heretofore the filament was generally clamped in a hook formed at the endof the leading-in wires or weldedthereto. These methods are satisfactory where comparatively long filaments are used, although poor connections are sometimes obtained and theactual point of contact between the filament and lead wire cannot be accurately controlled. Taking as a the flattened hook portion. Such differences in 1 filament length result in irregular performance of the lamps. 1

One of the objects of my invention is to provide a construction in which the filament length is accurately controlled. Another object is the provision of a reliable joint between the filam'ent and leading-in wires.

Further features and advantages of my invention will appear from the following description of species thereof and from the drawing.

In the drawing, Fig. l is an elevation of a lampcomprising my invention; Fig. 2 is a detailed view in perspective and at an enlarged scale show ing a connection between the filament and lead wire; Figs. 3, 4 and 5 are elevations, in section, of apparatus for forming the filament and lead wire connection in successive operating steps; and Fi'g. 6 is a section along line 6-6 of Fig. 3 showing filament supporting grooves. I

Referring to Fig. -1, an incandescent lamp is shown comprising a filament I II mounted on leading-in wires l2, l3. The said filament H) in Such a construction may this case consists of a straight wire, the ends of which are embedded in the said leading-in wires. As shown in Fig. 2, the ends of the leading-in wires have a definite predetermined form, preferably rectangular in cross-section, and the filament i0 is embedded in at least one face of the square section, such as the face It. of leading-in wire 12.

ment from the point'll' to the end thereof. Thus the operative portion of the filament extends a definite distance between the inner faces l5, l6 of the leading-in wires l2, l3.

ince the filament consists of a hard metal such as tungsten and the leading-in wires The method of forming the joint between the filament and leading-in wires is shown progressively in Figs. 3, 4 and 5. Referring to Fig. 3, the filament wire l0 lies on the face of a spring actuated block or jaw l5 and in V-shaped grooves l6 (Fig. 6) in a lower die H in which the block I5 is mounted. A spring actuated block or jaw I8 is mounted in the plunger or upper die IS, the width of said block l8 being equal to the desired length of the operative portion of the'filament, and the width of the upper die l9 being equal to the length of the operative portion of the filament plus twice the leading-in wire diameter. The upper die I9 is lowered so that the block l8 engages and firmly and immovably holds the filament wire l0, after which the upper die enters the lower die I1 and engages the circular leadingin wires l2, [3 which lie in the spaces between the sides of the block 18 and lower die l1. As the downward movement continues, the upper die l9 severs the filament wire I0 and the block I5 is forced down against the action of spring 20 until feet 2| thereon engage the die l1. As the upper die I9 continues to move down against the action of spring 22, located between the block l8 and said upper die, and spring '20, the leadingin wires l2, 13 are pressed or molded into the rectangular or square space between lower die l1, block I 5, upper die l9 and block [8. The extreme ends of the filament are turned upward as shown in Fig. 5, and the leading-in wires are securely molded around the ends of said filament. It is filament between the lead wires is. very accurately controlled since the said lead wires are so confined in the dies during the swaging and embedding step that they are not permitted, due to their tendency-to flatten, to encroach upon "the of said Jaws and then pressing and molding: a por- J'aw and around the translation element end extending therefrom to embed said ends ofthe translation element in the leading-in wires.

2. The method of mounting a filament on a. pair of leading-in wires by embedding the ends or said filament therein which consists in so confining the said leading-in wires in dies duringthe swaging and embedding step that they are not permitted, due to their tendency to flatten, to encroach upon the intended eii'ectlve length of the filament.

LEO R. PETERS- tion of a ieading-in'wire against each side of said