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Sept. 3, 1946. 2,406,961 A. v. NICHOL ' DEVICE FOR USE WITH HELICALLY-WOUND COILS Filed July 15, 1943 JWVW. 2,406,961 Patented Sept. 3, 1946 UNITED STATES PATENT OFFICE 2,406,961 DEVICE FOR USE WITH HELICALLY-WOUND COIL S Arthur V. Nichol, Elkins Park, Pa., assignor .to .Philco Radio and Television Corporation, Phila delphia, Pa., acorporation of Delaware Application July 15, 1943, Serial No. 494,856 4 Claims. (01. 175-—-359) 1 2 rI_‘his invention relatesto a novel device for use with helically-wound coils such as those com ‘In Fig. 2, there is shown a coil structure com prising a helically-wound coil 5 and a coil-sup porting form or support 6. The support 6, which may be tubular or cylindrical in form, is prefer ably pre-grooved to receive and hold in pre determined alignment the several turns of the coil, as shown in Fig. 4. The comb structure I, monly employed in radio apparatus and the like. :One object of the invention is to provide a simple inexpensive device adapted for use with such a coil, especially in instances where tap connections are utilized in conjunction with the coil. The device serves to preserve the spacing between the coil turns and also serves to sup provided by this invention, extends longitudinally of the coil with its teeth inserted between the port the tap connections and to insulate them 10 coil turns in abutment with the coil-supporting form, and with its recesses accommodating the from one another. coil turns. In order to secure the device I to the Another object of the invention is to provide coil structure, there may be provided apertures a device comprising an insulating member ‘i in the end portions of the device to accom adapted to extend longitudinally of a coil and having spaced recesses to receive the successive 15 modate securing elements, such as shown at 8. Device I is also provided with apertures or pas turns of the coil, and also having apertures 0r sages 9- extending from predetermined ones of passages extending from predetermined ones of the recesses to the opposite side of the device and adapted to accommodate tap connections, tions. A further object of the invention is to provide 20 such as shown at IE! in Figs. 2 to 4. The end por said recesses to accommodate the tap connec tion of each tap connection is bent as shown in Fig. 3 and extends transversely through va por tion of recess 4 in engagement with the coil con ductor 5. The depth of recess 4 is such that the a device of this character in the form of a simple comb structure. Another object of the invention is to provide a novel tap-securing device in conjunction with 25 bent end of the tap connection is ?rmly between a helically-wound coil structure. the coil conductor and the end wall of the re Other objects and features of the invention cess, as shown in Fig. 4. This arrangement pro will appear hereinafter. vides a very secure mechanical attachment of the In the accompanying drawing: tap connection to the coil. Fig. 1 is an elevationa1 view of the device pro Electrical connec vided by the invention, with the central portion 30 tion between these elements is effected at the extreme end of the tap connection externally of broken away to permit illustration on a desired device I by depositing small quantities of solder scale; II on the said elements. Thus, the device not Fig. 2 is a similar elevational view showing the only serves to preserve the spacing between the device applied to a coil structure; Fig. 3 is a detail sectional view taken along 35 coil turns but it also locates and securely sup line 3--3 of Fig. 2; and Fig. 4 is a sectional view taken along line 4-4 of Fig. 3. Referring more particularly to the several views of the drawing, the device provided by this in 40 vention comprises a member I formed of insulat ing material, such as Bakelite, and constructed so as to cooperate with a helically-wound coil structure in the manner shown in Fig. 2, as will ports the tap connections and insulates them from one another, and it permits the use of a very simple electrical joint between the tap con nections and the coil. In using the device I in conjunction with a particular coil, the tap connections are threaded through the apertures 9, prior to the assembly of the device on the coil, and the ends of the connections are then bent as shown and are posi be presently described. To this end,v the member 45 tioned in recesses 4. The device is then assem bled on the coil with the bent ends of the tap I has end portions 2 adapted to be secured connections ?rmly held, as above described. to the end portions of a coil support, and spaced Small quantities of solder are then applied to the teeth 3 and recesses 4 adapted to cooperate with exposed ends of the tap connections and the ad the successive turns of the coil with which the device is associated. The teeth and recesses, 50 jacent surfaces of the coil conductors. which extend along illustrated, are so that the teeth will of the coil and the turns. one side of the member I, as arranged and dimensioned ?t between successive turns recesses will receive the coil The device of the invention is particularly use ful in instances where the coil structure is sub jected to vibration tending to dislodge the coil turns and the tap elements. For example, the 55 invention is highly desirable in connection with 3 2,406,961 4 radio apparatus employed on moving vehicles and the like. It will be understood, of course, that the width 2. In combination with a helically-wound coil structure, an insulating member extending 1on gitudinally of said coil structure externally of of the teeth and the width and depth of the re cesses will vary according to the structural char acteristics of the particular coil with which the device is to be used. With regard to the over-all dimensions of the device, the length will be de the same and secured thereto, said member hav ing spaced recesses receiving the successive turns of the coil, said member also having a plurality of apertures or passages extending from predeter mined ones of said recesses, tap connections ex termined by the axial length of the particular tending through said apertures and having their coil structure with which the device is to be used, while the other dimensions will be such as to per mit the intended functioning of the device and at the same time give it sui?cient strength. In one physical embodiment, which may be taken as an example, the device had an over-all length ends bent and securely held in said recesses in ?rm engagement with the coil turns, the said ends of the tap connections extending externally of said recesses, and means forming an electrical joint between the extending end of each tap connec tion and the associated coil turn. 3. In combination with a helically-wound coil structure, a tap-securing member attached to said structure externally of the same and having of 5%; inches, a thickness of Tag of an inch and a width of % of an inch. The teeth were .035 inch wide, while the recesses were .056 inch wide and .1 inch deep. a recess receiving a coil turn, said member also Although a single device is shown in associa 20 having an aperture or passage extending from tion with the coil structure in Fig. 2, a plurality said recess, a tap connection extending through of such devices may be used in conjunction with said aperture and having its end bent and secure the same coil and may be spaced about the pe ly held in said recess in ?rm engagement with ripheral surface of the coil. said coil turn, the said end of said connection It will be understood, of course, that the in extending externally of said recess, and means vention is not limited to the particular structural forming an electrical joint between the extend embodiment disclosed but is capable of modi?ca ing end of said tap connection and the associ tion Within the scope of the appended claims. ated coil turn. I claim: 4. In combination with a helically-wound coil 1. In combination with a helically-wound coil structure, an insulating member extending lon structure, an insulating member extending lon gitudinally of said coil structure externally of the same and secured thereto, said member having spaced recesses receiving the successive turns of the coil, said member also having at least one aperture or passage extending from a predeter mined one of said recesses, a tap connection ex tending through said aperture and having its end bent and securely held in said one recess in firm gitudinally of said coil structure externally of the same and secured thereto, said member having 35 spaced recesses receiving the successive turns of the coil, said member also having at least one aperture or passage extending from a predeter mined one of said recesses, and a tap connection extending through said aperture and having its end bent and securely held in said one recess in ?rm engagement with the coil turn therein, the engagement with the coil turn therein, the said 40 said end of said tap connection being electrical end of said tap connection extending externally ly joined to the associated coil turn. of said recess, and means forming an electrical joint between the extending end of said tap con nection and the associated coil turn. ARTHUR V. NICHOL.