US1704151A - Spool for electrical instruments and the like - Google Patents

Description

March 5, 1929. SIMPSON 1,704,151

SPOOL FOR ELECTRICAL INSTRUMENTS AND THE LIKE Filed July 18,, 1927 [ill] [Mum 502m?? fqzy 5077/ Mum,

Patented Mar. 5, 1929.

UNITED STATES.

RAY SIMPSON, OF RIVER FOREST, TLLINOIS, ASSIGNOR TO JEWELL ELECTRICAL IN- STRUMENT 60., OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

PATENT OFFICE.

SPOOL FOR ELECTRICAL INSTRUMENTS AND THE LIKE.

Application filed July 18,

The present invention relates to spools for electrical instruments and the like and a method of constructing electrical connectors for .such spools and other small electrical parts.

One of the objects of my invention is the provision of a spool for electrical instruments having a conducting member molded into and secured in said spool at a plurality of points in such manner that the conductor may be severed between any of its points of support and bent to form a simple connector.

Another object of my invention is the provision of a novel form of construction for small electrical parts and connectors of the class described, upon which all projecting parts are circular in cross section so that dies may be constructed with a minimum of labor 2o upon-a lathe. I

Another object of my invention is the provision of a novel method of constructing or forming the spools and connectors of the class described.

Other objects and advantages of my invention will appear more fully from the following description and from the accompanyin drawings, inwhich similar characters ofre erence indicate similar parts throughout the several views.

In the drawings:

Fig. 1 is a lan view of a spool at one of the stages in t e formation of the connectors;

Fig. 2 is an elevational cross sectional View on the lines 22 of Fig. 1;

' Fig. 3 isa plan view of the finished spool and connectors; and 4 Fig. 4 is a side elevational view of the same.

Referring to Figs. 1 and 2, 10 indicates in its entirety my spool and its associated parts in this stage of its manufacture. The spool 10 is preferably formed with a rod or shaft 11 supporting at each end a disc or flange 12 and 13 projecting at substantially right- 5 angles to the shaft 11.

The shaft 11 and the flanges 12'and 13 are preferabl but not necessarily, formed with an axial ore 14'for convenience in attachment of the spool to other parts and for use 59 in winding the spool; however, the spool may also be formed without such a bore.

The spool 10 is-provided at one or both of its ends with a plurality of projecting bosses 15, 16, 17 and 18, and the bosses 15 to 18 are preferably made of substantially circular 1927. Serial No. 206,434.

cross section in order to facilitate the manufacture of dies. The dies may thus be made upon a lathe with a minimum of labor and machining. The bosses are also preferably slightly tapered to facilitate the molding operation.

In order to provide a simple, efficient and inexpensive connector for spools of the class described, I prefer to mold the spool 10 of bakelite or other insulating compound and during this molding operation there may be imbedded in the bosses 15 to 18 an electrical conductor 19.

The conductor 19 is preferably located within the bosses upon the exterior surface of the flange 13 but, if desired, it may be spaced slightly from said surface without dispensing with many of the advantages of the invention. The conductor 19 is preferably a strip of thin sheet metal of electrical conducting qualities, such as copper, and it is preferably in the form of an annular ring, as shown in Fig. 1.

The flange 13 may also be formed with a plurality of small apertures 20 located near its outer edge for the passage of the electrical conductors which form the coils 21. The flange 13 may also be provided with similar apertures 22 near the shaft 11 to permit the passage of the inner end of one or more conductors forming the coils 21.

After the spool has'been molded as shown in Figs. 1 and 2, with the conductor 19 imbedded at a plurality of points, such as the bosses 15 to 18, this spool ma be employed for supporting any number 0 separate coils for electrical instruments or other purposes. A number of separate connectors ma' then be formed, dependin upon the num er of coils employed upon the spool, and the method of forming these connectors is as follows: A saw or other cutting instrument capable of severing the conductor 19 may be used and the conductor 19 cut at a plurality of points such as 23, 24, 25 and 26. This efl'ectively separates the conductor 19 into a plurality of short segments, each of which is supported by one or more bosses in which the segment is imbedded, and I desire to be understood that an number of such bosses'and cuts may be emp oyed.

The loose ends 27, 28, 29 and 30 of the segment-s may then be bent u ward and back' upon themselves, as shown mFigs. 3 and 4, to form a plurality of connectors 31, to which 110 terminals may be soldered or otherwise permanently connected. The spool 10 may then be wound with a plurality 01: turns of insulated wire or spaced turns of wire separated by insulating layers, thereby forming the coils 21. The endsof the coils may be brought up through the apertures 20 or 22 and soldered or otherwise permanently connected to any of the segments of the conductor 19."

As shown in Fig. 3, both the terminal wires 32 and the ends 33 of the coils have been inserted Within a single connector 31 and secured by soldering.

Another method of accomplishing the same result is to solder the end 33 of the coil to the segment at another point, reserving the connector 31 for the terminal 32.

If desired, the cuts 24 may be made midway between a pair of bosses so that two loose ends or segments will 'be available on each side of the boss. One of these ends may be used as a connector for the end 33 of a coil, while the other end of the segment may be used as a connector for a terminal 32.

It will thus be observed that l have provided a simple and economical structure by which any number of connectors may be formed upon a spool oi uniform type and that my spool is adapted to be molded of bakeliteor other insulating compound with the connectors secured therein at a plurality of points. The dies for moldingsuch parts may be constructed with a minimum of labor because all of the parts are circular in cross section and the spool and connector thereby provided are durable, economical and eliicient.

While l have described my novel connector and its form of support as applied to an insulating spool for electrical'instruments, ll desire to be understood that my invention is not necessarily confined to use upon spools but may be employed uponsmall electrical parts of all kinds, wherever it is desired to use connectors of the type described, such as upon transformer casings or casings for other small electrical parts.

While I have illustrated and described a preferred embodiment of my invention, many modificationamay be made without departing from the spirit of the invention, and I do not wish to be limited tothe precise details set forth but desire to avail myself of all changes within the scope of the appended claims.

Having thus describedmy invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In an electrical instrument, a spool for coils or the like, comprising a molded insulating member having a plurality of cylindrical bosses molded thereon and a conductor supported on said spool by molding the same in one or more of said bosses.

2. In an electrical apparatus, a molded insulating member having ends of circular cross section and having a boss of circular cross section molded on said member, and a strip of electrical conducting material molded in said boss'and exposed at other points on said memher to form an electrical connector.

3. ln an electrical apparatus, a molded insulating member having ends of circular cross section and having a plurality of bosses of circular cross section inolded on said member, and a ring of electrical conducting material molded in said bosses on the surface of said member,

The method of forming an electrical connector, comprising molding an insulating support with a strip of electrical conducting material molded therein at a plurality of points and exposed at other points and severing the stripbetween one or more points of support.

5. Themethod of forming an electrical connector, comprising molding an insulating support with a strip of electrical conducting material molded therein at a plurality of points and exposed at other points, severing the strip between one or more points of support and bending said strip to form an electrical connector 6. ln a new article of manufacture, acoil unit for electrical instruments and the like comprising a molded insulating spool having a plurality of integral frustro-conical bosses carried by one end, anda ring of electrical conducting material lying on one end of said spool and secured by molding in said bosses, said ring being severed between certain of said bosses, and bent to form electrical connectors. l

7. In anew article of manufacture, a coil unit for electricalinstruments and the like comprising a molded insulating spool having a plurality of integral frustro conical bosses carried by one end, a ring of electrical conducting material lXlIlg on one end of said spool and secured by molding in said bosses, said ring being severed between certain of said bosses, and bent to form electrical con- RAY SIMPSON.

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