US894826A - Multiple cluster-socket. - Google Patents

Description

PATENTED AUG. 4, 1908.

G. D. GERVIN MULTIPLE CLUSTER SOCKET. APPLIOATION FILED JULY 16,1907.

a luon 1013s UNITED STATES PATENT OFFICE.

CHARLES D. GERVIN, OF NEW YORK, N. Y., ASSIGNOR TO JOHN H. DALE, OF NEW YORK, N. Y.

MULTIPLE CLUSTER-SOCKET.

Specification of Letters Patent.

Patented Aug. 4, 1908.

Application filed July 16, 1907. Serial No. 384,102.

To all whom 'it may concern:

Be it known that 1, CHARLES D. GERVIN, a citizen of the United States, residing at the city of New York, in the borough of Manhattan and State of New York, have invented certain new and useful Improvements in Multiple Cluster-Sockets, of which the following is a full, clear, and exact description.

My invention relates to cluster lamp sockets or receptacles, and particularly those in which ordinary incandescent lamps having a threaded base may be symmetrically supported by a central frame or part and con nected in a single multiple circuit.

The invention consists particularly in the mechanical features of construction and in the arrangement by which the electrical connections are made. I

The main purpose or object in view is to reduce the number of parts and generally to simplify and cheapen the construction of this type of lamp socket as much as possible.

In the drawings: Figure 1 is a plan view looking into a multiple cluster socket embodying the principles of my invention; the usual cover is removed in this figure; Fig. 2 is a vertical sectional view of the same; Fig. 3 is a detail view showing the construction of an insulating block forming part of the device; Fig. 4 is a bottom view of the same; and Fig. 5 is a side view.

Onc of the main features of the present invention lies in the characteristic by which sockets for different numbers of lamps can be made from the same stock parts. In order to obtain this result there are provided means by which threaded shells can be at tached to a central insulating block in different spaced apart relations, and also means by which a common central stud terminal for the lamps is applicable thereto regardless of how they may be spaced. The various fastening devices also constitute electrical .connections, and they are so designed that the parts may be assembled or grouped in different ways to accommodate different numbers of lamps.

Referring to the drawings in which like parts are designated by the same reference sign, 1 indicates a casing conveniently of hemispherical form, and havin openings 2, spaced symmetrically thereal iout. -There may be any number of these openings, and in practice the casings would be perforated to suit the particular number of threaded shells assembled in the manner hereinafter described.

3 indicates the central insulating block to which the threaded shells are attached. As shown particularly in Fig. 3, this block is perforated with various holes 4, which correspond to divisions of sixths, fifths, fourths, thirds and halves of a circle. It is evident that certain of these holes serve as common divisions in the above; for example, the hole 4 serves as a division in every case, while the holes 4 serve only as divisions for thirds and sixths. The holes 4 serve only as divisions of the circle into fifths. I am aware that this general scheme or division is not broadly new, being disclosed in Patent No. 844,276, but I regard the particular use and arrangement thereof as herein shown, as constituting my invention.

The insulating block 3 is grooved at 5, upon its periphery which is made circular. At a point between two of the divisions 4, there is a deep radial roove 6, connecting with the circumferentia groove 5. Extending around the circumferential groove 5, and projecting radially into the groove 6, there is a stout resilient strip, wire or band 7,.which is springy and elastic enough to be sprung into the groove and be retained tightly there in by its own resiliency.

8 denotes a central binding post or screw which is connected to the wire 7 so as to make a permanent electrical connection therewith.

By reason of the resilient character of the wire 7 it is capable of yieldin r inward slightly when engaged by the centreil stud terminals of the lamps. This wire does not fit absolutely tight in its containing groove and the engagement of the lamps deforms it slightly in opposition to its resiliency. Accordingly it is impossible for any slight jarrin of the lamps to destroy the central stud e ectrical connection because the elasticity of the wire 7 is sufficient to accommodate any slight movement or loosening which might occur from jar or vibration. The spring pressure moreover exerts an effect to keep the lamps tightly held in their containin sockets.

The threaded shells for t 1e lamps are shown at 9. Each has a pair of ears 10 and 11, extending therefrom at diametrically opposite points. These ears are bent so as to ie in parallel spaced apart relation to one another in a direction diagonal to the axes of the shells. adapted to embrace the insulating block 3, fitting closely against the upper and lower surfaces thereof, as clearly shownin Fig. 2. Each of the cars is perforated by holes in alinement with one another in a direction perpendicular to their plane, and rivets or fasteners .12 are adapted to be passed through these holes and through the holes 4 of the block 3, so as to secure the shells thereon. It will be evident that the fasteners 12 may be passed through any desired holes 4, so that the threaded shells can be. grouped in any desired combination or number around the block. In the drawing four shells are shown assembled in this way, corresponding to the number of openings in the casing 1. The various parts are finally permanently fixed in their relation by the insulating bushings 13, which screw upon the threaded shells and engage the casing 1 through the openings 2 thereof. 7

For the purpose of making electrical con nection from a common binding post to the various threaded shells I employ a ring 14, over which each of the fasteners 12 is looped or engaged, as shown in Figs. 2 and 3.

15 indicates a screw engaging this ring and extending upward through the insulating block 3 to a binding post 16. he circuit wires being connected to the binding posts 8 and 16, it will be clear that an operative multiple cluster socket is produced in which the lamps engage the wire 7, fixed to bind ing post 8, with their central stud terminals, and complete the circuit to the binding post 16 through their threaded shells.

A feature of the construction lies in the provision of notches 17, in the various threaded shells at points diametrically opposite from one another on a diameter at right an les to that of the ears 10 and 11. he wit. th of these notches is not sufficient to in clude all of the material of the shells between the ears, but is nevertheless sufficient to se arate the shells widely from the wire 7. w iich constitutes the central stud terminal for the. lamps. V This is a very advantageous construction, since it provides adequate. insulation without weakening the shells to the extent which they would be weakened if this insulation distance was provided solely by making the ears 10 and 11 of the considerable length which would be required in the absence of the notches 1.7.

What I claim is 1. A multiple cluster socket comprising an nsulating block, a plurality of socket shells electrically connected to each other and arranged about and having ortions secured to In this relation the ears are l insulating block, a plurality of socket shells 5 arranged about and having portionssecured to said block, means fastened to the block and elcctrically connecting togcthcr all of said shells, and a. metallic strip extending around said block between said portions and constituting a common central terminal for a plurality of lamps.

3. A multiple cluster socket comprising an insulating block with a circuinferential groove, a resilient strip contained in said groove and constituting a central terminal for aplurality of lamps, and shells positioned around said block.

4. A multi )le cluster socket comprising an insulating bl ock having a circumferential groove, a resilient wire therein and constituting a central terminal for a plurality of lamps, and shells positioned around said block.

5. A multiple cluster socket; comprising an insulating block, a resilient strip loosely surrounding the same and capable of elastic deformation from a circular outline and constituting a central terminal for a plurality of lamps and shells positioned around said block.

6. A multiple lamp socket comprising an insulating block having a circumferential groove, a resilient wire loosely contained therein and capable of elastic deformation from a circular outline and constituting a. central terminal for a plurality of lamps, and shells positioned around said block.

7. A multiple lamp socket comprising a circular insulating block having a circumferential groove and having a deep radial groove conu'nunicating therewith, a stout rcsilient metallic wire sprung in said grooves and held therein by its resiliency, and threaded shells positioned around said block.

8. A multiple cluster socket comprising an insulating block having a plurality of holes corresponding to various different e ual angular divisions of a single circle, she ls each having a pair of cars, means for engaging said ears with any desired holes, and a. common central terminal.

9. A multiple lamp socket comprising an insulating block having differently angularly spaced holes and having a circumferential groove, a circular metallic part extending around the block in said groove, threaded shells, and means engaging said shells and passed through any desired holes in said block.

10. A multiple lamp socket comprising an insulating block having holes extending perpendicularly therethrough, threaded shells having ears bent to extend in parallel relation to one another, and in a direction diagonal to the axes of the shells, means passed through said holes for engaging said ears, and a common central terminal.

11. A multiple lamp socket comprising an insulating block, threaded shells having ears extending therefrom at diametrically opposite points, means engaging said ears to secure the shells to said block, and a single central terminal extending around said block between said ears.

12. A multiple lamp socket comprising an insulating block havin holes, threaded shells having ears extendmg therefrom at diametrically opposite points, said shells being notched intermediate the ears, means passed throu h said holes for engaging said ears, and a sing e central terminal extending around said block 0 posite said notches.

13. A mu t1 le lamp socket comprising an insulating bloc threaded shells having ears extending therefrom at diametrically op osite points, means engaging said ears to asten the shells to said block, means for electrically connecting together the various shells, and a single central terminal extending around said block between said ears.

14. A multiple lamp socket comprising an insulating block, threaded shells having ears extending therefrom at diametrically opposite points, said shells being notched intermediate the ears, means enga ing said ears for fastening the shells to sai block, and a single central terminal extending around said block opposite said notches.

In witness whereof, I subscribe my signature, in the presence of two witnesses.

CHARLES D. GERVIN. Witnesses: V

WALDO M. CHAPIN, JAMES DAN'roNIo.

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