US477786A - Evelyn l - Google Patents

Description

(No Model.)

H. L. SMITH & G. O. H. FOSTER.

SOCKET FOR INGANDESOENT LAMPS.

No. 477,786. Patqnted June 28, 1392.

U ITED STATES PATENT OFFICE.

EVELYN L. SMITH AND GEORGE C. H. FOSTER, OF BRIDGEPOR'I, CONNECTI- CUT, ASSIGNORS TO THE CROWN ELECTRIC MANUFACTURING COMPANY, OF SAME PLACE.

SOCKET FoR INCANDESCENT' LAMPS.

SPECIFICATION forming part of Letters Patent No. 477,786, dated June 28,1892.

Application filed September '7. 1891; Serial No. 405,006. (No model.)

To all whom it may concern; so asto fit snugly within said slot, whereby Be it known that we, EVELYN L. SMITH and said screw can have no independent axial ro- GEORGE C. II. FOSTER, both citizens of the tation.

United States, residing at Bridgeport, in the 11 is the upper contact-spring, secured dicounty of Fair-field and State of Connecticut, rectly to the bottom of the screw by the 5 5 have invented certain new and useful Irnnut 12, the latter also serving to secure the provements in Sockets for Incandescent screw in position, as shown at Fig. 3.

Lamps; and we do hereby declare the follow- 13 is the lower contact-spring, secured to ing to be a full, clear, and exact description the binding-post 4.

10 of the invention, such as will enable others 14; is a stem journaled within the yoke 5, 6o skilled in the art to which it appertains to and 15 a suitable key rigid with said stem, make and use the same. 7 whereby the latter may be conveniently ma- Our invention relates to certain new and nipulated. On this stem are secured the useful improvements in sockets for incandesswitch-cam 16 and rectangular controlling- I 5 cent lamps, and has for its objects to simplify block 17. r 5; and cheapen the construction of such devices, 18 is a flat spring secured to the disk 2 and to reduce to a minimum the resistance which bearing against the block 17, the function of the device itself offers to the electric current, said spring being (as is usual in suchiinand to secure the socket-screw as against any stances) to prevent the overthrow of the stem 20 independent axial rotation. V at the end of each quarter-revolution thereof. 70

With these ends in view ourinvention con- The switch-cam 16 comprises a skeleton sists in the details of construction and comframe 19, secured to a body 20, which latter bination of elements such as will be hereinis rigid on the stem 14. This frame is made after fully set forth, and specifically desigfrom thin highly-tempered metal and by its nated by the claims. resiliency affords a contact With' the springs 7 5 In the accompanying drawings, Figure 1 is 11 13 far superior to the contact between a a side elevation of our improvement; Fig. 2, solid cam and springs. The yoke 5 is not in a section at the line :0 a: of Fig. 1; Fig. 3, a theelectrical circuit, the body 20 being made section taken at a right angle to the section from any non-conducting material, and the shown at Fig. 2; Fig. 4:, a section similar to current flows directly from the lower contact- Fig. 3, but showing the socket-screw, upper spring to the socket-screw, to which latter the contact spring, and securingnut disconupper contact-spring-is secured. In the manected, the lower spring-terminal and the jority of devices of this character the yoke stem and parts carried thereby being omitted; (or pillars, as termed) is in the circuit, and

3 5 and Fig. 5 a section at the line 3 y of Fig. 8. for this reason the resistance ofiered by the Similarnumbers denote like parts in the sevsocket itself to the electro-motive force is so l fi u es great that the light is materially lessened 1 2 are the upper and lower insulatingthereby. In our improvement the yoke is not disks, respectively. in circuit, but the current flows directly from 4o 3 4 are the upper and lower terminals, sethe lower terminal to the socket-screwwitlr o cured to the disks 1 2, respectively, and to out any deviation, and to these facts we atwhich are Secured the nducting-Wires in tribute the superior resultselfected by'our the usual manner. improvement. Again, in all'prior devices of 5 is ayoke secured to the disk 2 by screws this description the socket-screw has caused 5 6 and extending through openings 8 in the a most vexatious trouble, owing to the fact 5 disk 1, the bridge 7 of said yoke being counthat it has been imperfectly secured. It is tersunk within the disk 1, so that the latter absolutely necessary that said screw should is rigidly held as against rotary movement. have no independent axial rotation, and by 9 is a slot in said bridge, and 10 is the socketutilizing a yoke in our improvement, as here- 50 screw, which is cut away, as shown at Fig. 5, inbefore set forth, we are enabled to secure I00 nal'ed in said yoke, and the cam carried by 9 said stem, substantially as set forth.

2. The combination of the upper insulatin g-disk, the yoke-bridge having a slot therea in, the socket-screw shank fitted closely within said slot, the upper contact-spring, and the nut whereby said screw and spring are secured together and to said disk, substantially ias shown and described.

3. The combination of the upper insulating-disk having openings therein, as described, the yoke extending through said openings and having a bridge which is countersunk within said disk, the socket-screw extending through said yoke and di'sk, and the nut on the lower end of said screw, whereby said disk is secured between said bridge and nut, substantially as shown and described.

In testimony whereof we affix our signatures in presence of two witnesses.

EVELYN L. SMITH. GEORGE C. H. FOSTER. Witnesses:

F. W. SMITH, J r., J. S. FINCH.

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