US1895776A - Spool for electrical coils - Google Patents

Description

jan. 933. 1*-1 STQLP 395,;527@

sPooL FOR ELECTRIC CoILs Filed may 8, 1.951

/N VEN TOP f2? mi P A TTOP/VEV Patented Jan. 31, 1933 UNITED STATES.

PATENT OFFICE FRANZ STOLP, F BERLIN-PANKO'W, G-ER-IMIAIN'Y, ASSIGNOB TO'SIEMENS AITD HALSKE AKTIENGESELLSCHAFT, 0F SIEMENSSTADT NEAR BERLIN, GERMANY, A COMPANY OF GERMAN Y SPOOL FOR ELECTRICAL COILS Application led Hay 8, 1931, Serial No.

The invention relates to spools for elec trical coils which are substantially so assembled from individual parts without gummingl or pressing that the spools are stable in t emselves whereby a coil support part can be formed as a terminal block.

Methods hitherto known consisted of a member carrying the windinfr for instance of' prismatic. form, notched at the' top and bottom and bent over and provided with a iange by gumming or pressing.A The manufacture of' spools of this kind necessitated various operations and special machines and was frequently very difficult just according to the nature of the manufacturing material. The

manufacturing costs of such spools were consequently comparatively high. Particular diiculties were met with in the manufacture of spools capable of withstanding the tropics and high tension which in order to comply with atmospheric. or voltage conditions had to be. manufactured from bakelite-hard paper which did allow the separate parts sticking together or if so only under excepv tional conditions. Spools of this type mostly consisted of moulded insulation or a metallic member provided with bakelite-hard paper flanges and covered with insulating paper or rubber.

In accordance with the invention these defects are removed and the manufacturing costs reduced in this way that the spools are assembled from a plurality of fiat blanks which yield stable members without gumming or pressing operations. Since the spools are assembled immediately prior to winding which is done in a few moments and is therefore not to be considered as a special operation the manufacturing costs are limited solely to material and stamping costs. Bakelitehard paper can also be employed as manufacturing material for the method according lto the invention and spools capable of resisting the tropics and high tension can thus 45 be manufactured without diiculty. In re- 535,830, and in Germany June 7, 1930.

spect to methods hitherto employed these spools not only stand out owing to their low manufacturing costs but also owing to considerably increased reliability of operation. A further simplification in respect to methods hitherto known is accomplished in this way that a part of the coilsupport can be formed as a terminal block whereby a special connecting strip and the fixing means necessary for same are dispensed with.

In the drawing which shows spools of' prismatic form, v

Fig. l is an end elevational view of a completed spool;

Fig. 2 is a side View of the spool shown 'in Fig. l;

ceA

Fig. 3 is a top plan view of one embodi i ment of the invention showing a spool equipped with shelves having terminals supported thereon;

Fig. 4 is an end elevational view of another embodiment of the invention in which a wound prismatic member is supported between upper and lower stamped out flat parts; and y Figs. 5, 6 and 7 are' flat surface views of the stamped out parts necessary to form the spools shown in Figs. 1 and 2, Figs. 5 and 6 being the fiat sides, two of each of which are required to form the prismatie barrel of the spool and Fig. 7 being one of the spoolheads. The small apertures shown across the top of the spoolhead in Fig. 7 are provided for the accommodation of ends of coil windings to be supported on the spool.

In one embodiment of this inventions namely that which is illustrated by Figs. l andvQ, two flat blanks a and a of the form shown in Fig. 5 each provided with hollows b and b formed in edge portions of the blank and extensions o and c extending from ends of the blank are placed diagonally through an aperture d of two anges e, e of the form shown in Fig. 7 and so arranged that the blank a lies against the edge A and the blank a against edge B of both flanges. Ilhe extensions c and c of each of the parts a and a project beyond and normal to the outer faces of the anges e and e', respec- 5 tively, the part a resting on the edges A of the anges e and e' and the part a resting on the edges B of the langese and e. The side parts of the coil carrier still lacking and necessary to form the prismatic barrel of the m spool are formed by two rectangular parts and f each provided with a tooth g on their sides as shown in Fig. 6.

rlhese side parts ,f and f are so arranged that shifting into the anges e and e is again l5 carried out -diagonally and the teeth are then pressed into the hollows or b o part' a and and b of part a. The result is a box-like structure provided with ianges such as shown in Figs. and 2. Shifting of the 2@ angesinwardly is prevented by a strip of suiciently strong insulating paper which serves at the same time as a winding support.

lf the spool is to be provided with lterminals the part a which rests on the edges A of both flanges is replaced by a part L whose extensions corresponding to the extensions c, c of Fig. 5 are considerably increased to form comparatively wide shelves. These shelves are rovided with terminals or clamping pieces 'or terminations of ends of windings to vbe supported on the spool and for attachment of wires of an outside circuit. Fig. 3 shows a spool constructed in this way.

Fig. 4 shows an end elevational view of a spool in which the side parts f, f of the form shown in Fig. 6 have been replaced by a wound prismatic member z'. The wound pris- Leaders and beyond an end ange to form a terminal block.

5. A spool comprising spoolheads, a pair of spaced dat plate members extending be-` tween sald spoolheads, and a prismatic member inserted between said spaced dat plate members, said prismatic member maintaining said plate members in spaced relationship and forming therewith a prismatic barrel for the spool.

ln witness whereof, l hereunto subscribe my name this 9th day of April, 1931.

FRANZ STOLP.

matic member z' is inserted between the parts a and a and forms with these parts a and a 40 the barrel of the spool. In this constructional form it is not necessary to provide parts a and a with hollows b, b.

What is claimed is: 1. A spool for electrical coils comprising four separate Hat plates and two flanges and in which the four plates are held together by the ianges.

2. A spool for electrical coils comprising a set of four separate iiat plates forming a and in which the plates are provided with teeth engaging each other. p

3. A spool for electrical coils comprising a set of plates and end flanges, said plates having portions extending in the same plane as the plates and .normald tothe 4flat outer aces ofthe end flanges and bearing against the outer side of the flanges to hold said iianges and plates in assembled form.

4. A spool for electrical coils comprising individual fiat plates forming a prismatic coil carrier and end lian'ges therefor, one of the plates of said coil carrier having a por- 65 tion extending in the same plane as the plate prismatic barrel of the spool, and end flanges

Images