US352006A - Incandescent electric lamp - Google Patents

Description

(No Model.)

P. SCHAEPBR. l INGANDESNT ELECTRIC LAMP.

No. 352,006. Patented Nov. 2.11886.

UNITEDl STATES FnEDEnroK SCHAEFER, oF

, PATENT OFFICE.

BOSTON', MASSACHUSETTS.

lNczANDEsol-:NT E LECTmCLAM P.

SPECIFICATION forming part of Letters Patent No. 352,006, dated November 2, 1,886.

Application'led March l1, 1886.

To all whom it may concern:

Be it known that I, FREDERICK SCHAEFER, of Boston, county of Suffolk, and State of Massachusetts, have invented an Improvement in Incandescent Electric Lamps,of which the following description, in connection with the accompanying drawings, is a specication, like letters on the drawings representing like parts. This invention relates to and is an improvement on that class of incandescent electric lamps shown and described in United States application Serial No. 179,601, dated October 12, 1885, and has for its object to provide said lamp with means to stop the rotation of the lamp proper` within its holder,to thereby permit short-circuiting of said lamp.

The peculiar features wherein this invention consists will be hereinafter pointed out inthe claims at the end of this specication.

Figure l is a vertical section of a complete incandescent electric lamp embodying my invention; Fig. 2, a section of Fig. l on line m :v with the shade removed; Fig. 3,a side elevation of the insulating-disk partially broken out, the key being removed; Fig. 4, a'view of Fig. 3, looking upward; and Figs. 5 and 6,de tails to be referred to.

The bulb A, containing the carbon lament a and platinum electrodes a a2, is embedded in the plaster-ofparis mold a3, in which are secured the terminal lugs at ai", to which the platinum electrodes are attached. The mold a3 is surrounded by the metal band b,provided with the pins or projections b b2, ,which enter slots b3 b* (see Fig. 2) in the shell or casing B of the holder, and are rotated in a groove, b5, in said casing or shell. The shell or casing B contains within it the spring d, the disk d', of insulating material,separated from said sprin g by a washer, d2, of insulating material, Said insulating-disk being slotted at d3 (see Figs. 3 and 4) to receive a key, dx, by rotating which the lamp may be placed in and cut out of circuit, as desired. v.

The insulating-disk d has'secured to one of its faces, by screws d'L d5, contact-pieces e e', each of said contact-pieces being provided with an outturned ange, e2, said iianges being preferably in the saine diametrical line, as

5o shown in Fig. 4, the contact-piece e being extended over the slot dthe screw d5 being conserial No. 194,832. (No model.)

nected to one line-wire by the wire e". The wiref, which is connected to the Second linewire, is secured to the screw f', extended through t-he insulating-disk d', andscrewed into a metallic ring, f2, (see Fig. 3,) secured to the opposite face of the disk d,the said metallic ring being upset, as at ft The key dx is composed of a metal collar,h, having insulation h,(see Fig. 6,) the metal part of said collar having a shank, h2, on which is Secured a handle-hs, the insulation being provided with a groove, 2, and the metal with a groove, 3.

-The collar referred to is designed to enter the slot d3 and to be rotated therein by turning the handle hand the said collar is locked and maintained in position within said slot by the upset portion f4 of the metallic ring f2, which enters one of the grooves 2 3, referred to, according as the lamp is in or out of circuit, and also by means of washers h5 h6, which are mounted on the shank h2 of said co1- lar, and which act frictionally, to further lock and maintain said collar in position, said washers being one on the insidev and the other on the outside of the shell or casing B,as shown in Fig. 1.

When it is desired to place the lamp in circuit, the handle h3 is turned so as to have the metal portion h of the collar engaged by the contact-piece e on one side and by the metal ring f2 on the other side,the upset portion f 4 of said ring'entering the groove 3 and locking the key dx until positively moved.

With the lamp in circuit,the current enters the lamp by wire e* to the contact-piece e, from contact-piece e through the filament a to contact-piece e,from contact-piece e to the metallic ring f2 by the metal portion h of the collar, and from the metal ring f2 to the wiref by Screwf.

The manner of completing the circuit in the lamp as just described is especially advantageous in this class of incandescent electric lamps. When the lamp proper is connected to its holder, all danger of short-circuiting of said lamp is obviated by means of the upturned flanges e2, which limit the rotation of the lamp in its holder.

In Fig. 5 I have shown a shade, g, partially broken off, and provided with a collar, g', hav- ICO ing` grooves g g3, by means of which said shade l sulating-disk d, provided on one face with the is placed upon the lamp; but said shade is not herein claimed, as it forms the subject-matter of another application led concurrently here- 5 with, Serial No. 194,833.

I claiml. In an incandescent electric lamp, the bulb A,the mold to hold said bulb, and terminal lugs a4 a5, inoased in said mold, combined with the insulating-disk' d', having Contactpieces e e secured thereto, and provided with outwardly-turned anges e, to be engaged by said lugs, to thereby prevent said lamp from being shortcircuited, substantially as der 5 scribed.

2. In an incandescent electric lamp, the inmetal ring f2, upset as atf, and having con` tact-pieces ce scoured to its opposite face, combined with the key dx, composed of a metal 2o collar, h', having insulation h, and with the screw f, secured to the metal ring f2, and by which the current is conducted to the linewire, substantially as described.

In testimony whereof I have signed my name 2 5 to this specification in the presence of two subscribing witnesses.

FREDERICK SCHAEFER.

Vitnesses:

J. H. CHURCHILL, B. J. NOYES.

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