US 1005163 A
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' APPLIGATION FILED JAN. 10, 1908. 1,005,163, Patented 001. 10,1911.
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. ATTORNEY P.0ONRAD.
APPLICATION FILED JAN. 10, 1908. 1,005,163, Patented Oct. 10, 1911.
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WITNESSES: I INVENTUR UNITED STATES PATENT OFFICE.
FRANK CONRAD, OF SWISSVALE, PENNSYLVANIA, ASSIGNOR, BY MESN E ASSIGNMENTS,
TO WESTINGHOUSE ELECTRIC & MANUFACTURIN G COMPANY, OF EAST PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.
Specification of Letters Patent.
Patented Oct. 10, 1911.
Application filed January 10, 1908. Serial No. 410,241.
To all whom it may concern:
Be it known that I, FRANK CONRAD, a citizen of the United States, and a resident of Swissvale, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Transformers, of which the following is a specification.
My invention relates to electrical transformers, and it has for its object to provide a transformer that shall be exceedingly compact and simple in construction and be readily attachable to and detachable from the circuits in connection with which it may be employed.
Incandescent electric lamps having tungsten filaments are preferably operated upon lower voltages than lamps having ordinary filaments, because the tungsten filaments are very fragile when adapted for use upon'the usual lighting circuit voltages and are much less fragile and more durable when adapted for use upon relatively low voltages. In order that such lamps may be employed in connection with ordinary lighting circuits, I provide the transformer constituting the subject-matter of the present application which may be interposed between the supply circuit and the lamp.
My invention is illustrated in the accompanying drawings, Figure 1 of which is a transverse sectional view of a transformer constructed in accordance therewith, and Fig. 2 is a view, in elevation and in transverse section, of a modification of the transformer of Fi 1.
The transformer is preferably of the shell type, because of the greater adaptability of such a structure to compactness and simplicity, and it comprises a laminated magnetizable core 1 and a coil 2 constituting the primary and secondary windings thereof. Clamped against the top and bottom faces of the core structure 1 are insulating blocks 8 and 4 that are secured, by means of screws 5, to the outwardly turned ends of U-shaped clips or brackets 6 which extend from the top to the bottom of the core upon both sides thereof.
Secured to the lower insulating block 4 is a socket 7 for the reception of the attachment plug of an incandescent lamp having a tungsten filament, the leads from the secondary winding of the transformer being connected to the respective terminals of the said Socket by means of screws 8. The transformer of Fig. 1 is adapted to be attached to an ordinary lamp socket, and, to that end, an attachment plug 9 is secured to the upper insulating block 3, and the primary terminals of the transformer are connected thereto by means of screws 10. The transformer is provided with a two-part closelyfitting sheet metal casing 11 having in the top an opening through which the attachment plug 9 projects, and, at the bottom, an extension 12 surrounding the socket 7, the socket being accessible from the exterior of the casing. The lower section of the casing is provided near its upper edge with punched internal projections 13 that engage the sides of the transformer core and prevent relative rotation of the same with respect to the transformer, the recesses left in the exterior of the casing by the provision of the projections 13 being covered and hidden by the lower end of the upper section of the casing.
The transformer of Fig. 2 is adapted to be permanently connected to a chandelier or lamp bracket, and, to this end, an internally screw-threaded sleeve 14 is provided in the upper end of the casing for the reception of the nipple upon the chandelier or bracket, the primary terminal leads of the transformer extending outwardly through the sleeve.
I claim as my invention:
1. The combination with a transformer comprising a magnetizable core and a winding, of brackets located betweenthe sides of the core and the winding, and insulating terminal blocks located upon the ends of the core and secured to the ends of said brackets.
2. The combination with a transformer comprising a magnetizable core and a wind? ing, of brackets located between sides of the core and the winding, insulating blocks located upon the ends of the core and secured to the ends of said brackets, and a lamp terminal socket mounted upon one of the insulating blocks.
3. The combination with a transformer comprising a magnetizable core and a winding, of brackets located between the sides of the core and the winding, insulating blocks located upon the ends of the core' and secured to the ends of said brackets, a lamp terminal socket mounted upon one of the insulating blocks and an attachment plug mounted upon the other block.
4. The combination with a transformer comprising a magnetizable core and a Wind- In testimony whereof, I have hereunto ing, of brackets located between the sides of subscribed my name this 31st day of Dec, 10 the core and the Winding, insulating termi- 1907.
nal blocks located upon the ends of the core and secured to the ends of said brackets, and FRANK CONRAD a casing for the transformer having means Witnesses:
for securing it against rotative movement R. B. INGRAM,
relative to the transformer. BIRNEY Hume.