US2589640A - Form for windings and the like - Google Patents

Description

March 18, 1952 w, s-

FORM FOR WINDINGS AND THE LIKE Filed May 29, 1947 Patented Mar. 18, 1952 UNITED STATES BENT OFFICE 2,589,649 O M EQR.WIN I TD LIKE. :WilliamF; Stahl, Kenilworth, In. Apirlicationlt/Iayfifl, 1947, Serial No. 751,340

- 1- T isinvention relates t formiqr w ndin s. an w t e-method cf. cr ar nsthesame. ,Itiiis, particularly useful as a bobbin or spool1 tpr coil win ingsal hou h. tO V u1y wi l b anpl ab somewhat unsatisfactory for certain windings'because of the tendency of leakageof current about the ends. of t e ubu ar insert ur emrresularities or warping of the end flanges hay/eresulted in increasing the crevices through which a short may occur.

An. Qbject of the present invention isto pr vide structure which overcomes the abqve gi sadvantage and provides an unu y c means, for-sealing the windings against, forming a short in the circuit, Yet another object is to provide a, structure in which a tubular insert is employed having resil-ier t end portions which c nm'rmto an irre ulariti s. iut ccntcu of the flanges and thus form a tight seal against the passage of current. A still further object is to provide a tubular insert structure for bobbins which maintains the coils at such a distancefrom the core and flange joints as to prevent any loss of current. Still another object is to provide a bobbin of novel construction which is unusually effective as a form for electrical windings and the like.- Other specific objects and advantages will appear as the specification proceeds'f The invention is illustrated, in a preferred embodiment, by the accompanying drawing;'in which- Figure 1 is a perspective view of a form embodying my invention; Fig. 2, an enlarged-ye ical sectional view; and Fig. 3, a sectional de a1 view of the tubular insert or enclosure for'the bobbin core.

In the illustration given, It! designates a core which may be formed of laminated paper strips or of any other suitable material. Itv may be formed of paper impregnated with resinous or other material, or itmay be a molded body formed of plastic, etc. Over the core I0 is placed the sheath or spacing member ll, which may be formed of cellulose acetate or any suitable insulating plastic material, paper, etc. If desired, an inner apertured disk l2 may be provided at lit each end of the core.

and providedwith a substantially straight inner ring-fit. The disks 12 have their inner end poi? a iens-bearing against the inner side of therin portions l 6 and their inner edges-squarely engaging the core l-ll. Sucha positioning of the-disks I2 under the pressure of the spring flanges l5 lock-the flanges I3 against inward movement on core I.

If the end flanges ordisks l2 are not employed, the resilient ends l5 of the-spacer member H still serve efiectively as a sealing means by engaging m finiiflanges l2 and the resilient character of theflanges 15 cause them to follow-the contour of the flanges -l2- ir1especti-ve of irregularities ther in.-

inthemethod of'assembly and of use, it prefer o u e the. f lowing tep T e core I0 slp lvided first with the spacer member l l as sh in Fig. 2, and the disks 12 are placed against the bell-shaped ends IS. The flanges l3 are next placed in position against the disks l'2, andthe ends of the core which project beyond the ring portions [6 of flanges 13 are swaged outwardly to produce the locking shoulders I l. A suitable spinning method is described in my Patent No. 2,343,389 which issued March 7, 1944. At the time of the spinning or swaging of the ends of the core, the flanges I3 are preferably pressed inwardly so as to flex the spring flanges l5, oi the spacermember I I, or, alternatively, the spinning or swaging operation may be controlled so as to force the flanges l3 inwardly during the actual forming of the shoulders 14 and thus to bring about a tight locking of the flanges [3 in the position illustrated in Fig. 2.

The tubular core member I0 may. be of any desired shape, such as, for example, circular, rectangular, etc., and the flanges l3 and other members may similarly be of any desired shape.

The plastic material, such as cellulose acetate, etc., suggested for the spacer member II and the end disks I2 is found to be particularly useful in that such material, while being very thin, is

nevertheless sturdy and provides the rigid lock page of the flanges [3. The flared ends l of the I spacer member provide a substantial air gap between it and the joints at the ends of the core.

member while at the same time forming a tight seal with the end flanges which it engages.

While in the foregoing specification, I have set forth a single structure in substantial detail for" the purpose of illustrating one embodiment of the invention, it will be understood that the details of such structure may be modified widely by those skilled in the art without departing from videlockingshoulders maintaining said flanges on said core, and a tubular member extending about said core between said flanges and having flared -end portions engaging said flanges and urging them toward said shoulders.

.2. .A form for windings and the like, comprising a tubular core member, apertured flanges received uponsaid core at the ends thereof, said core having its end portions turned outwardly 'tojprovide locking shoulders maintaining said flanges on said core, apertured end disks lying ,against the inner sides of said flanges and having -edges engaging said core member, and a tubular member extending about said core and having flared end portions engaging said disks and urging them toward said flanges. v

3. A form for windings and the like, compris- 4. In a form for windings of the character set forth in which a hollow core member is provided with locking shoulders at its ends, apertured flanges received upon the ends of said core and being maintained thereon by said locking shoulders, a spacer member between said apertured flanges and having resilient, flared end portions abutting said apertured flanges on the core and urging said apertured flanges toward said shoulders.

5. A form for windings and the like, compris- 'ing a tubular core member of substantially unihaving its end portions turned outwardly to proing a tubular core member, apertured flanges received upon said core at the ends thereof, said core having itsend portions turned outwardly -to provide locking shoulders maintaining -said flanges on said core, apertured end disks lying against the inner sides of said flanges and having edges engaging said core member, and a tubular member extending about said core and having flared end portions engaging said disks and urging them toward said flanges, said tubular member and disksbeingformed of resilient plastic material. i

form cross section, apertured flanges having a central portion ofiset inwardly, the ends of said 1 core being turned outwardly to provide locking shoulders engaging said offset portion, end disks having inner end portions engaging the core and abutting-said offset flange portions, and a tubular spacer member snugly engaging said core member and having its ends flared to provide bell-shaped terminals engaging said disks and urging them against the ofiset portion of said end flanges.

6. A method of making forms for windings and the like, comprising placing a tubular spacing member having flared resilient ends upon a' tubular core, inserting apertured flanges over each end of the core, pressing the flanges against the resilient ends of said core, and turning the ends of the core outwardly against the flanges to lock them against said compressed flared ends of the spacing member. I WILLIAM F. STAHL; I

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS

Images