US1856681A - Electrical connecter - Google Patents

Description

May 3, 1932. R. B. WOLCOTT ELECTRICAL CONNECTER Filed July 23, 1930 zmmwlmg fivewfar: ifoaawr fi 2 0/0017:

Patented May 3, 1932 UNITED sTAT s' PA-TENT ferries nonnsoiq nlj' women; or nnmnuas'r,

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Application menu 28,, My invention relates toconnecter capsand' especially tolconnecter caps "used" 111 jco'nnec-f tion with extension} cords or conductors on electrical appliances for malnng; separable,

5 electrical connection with attachment plugs whichis simple 1nconstructionand oi few;

parts and comprises only a. comparatively thin insulating base whichmay'be made of fibre, laminated. bakelite; molded bakelite or similar insulating material, and a. suitable casing forming ahandleforthecap, The. casing also provides an eflicient strainrehef. and'is so constructed as to prevent the turning ofthe conductor therein. V V v 1 Conductor cords on llOllShOldBlGCtIlCillldG- vices are usually substantially oval" in form and the conductors therein are not twisted but are parallel rubber-coveredwires with an outer covering of braided silk or other suitable material. 335

suitable connecter cap in which these oval connecter cords may be used and in which the twisting of the cord relative to the cap will be prevented. j A further object is toprovide suitable means for connecting the conductor wiresto I the flat connecter blades in such a manner that the conductor wires lie, longitudinally within the limits of the cross-sectional contour of the blades and whereby any strain v T lt". i jT lSo anobject to -',cap-'which be of iew.

. bladesandi'n whichgthe wires'aref 15 not bent or. kinked in.n aklngcmnechoman Fig. 4 is a longitudi taken on a line'correspondi li g a v It is an object ofmy invention provide a mmrs comm

1930.; Serial no. name.

on the -conductors:adjacent the blades will be inilongitudinal relation thereto;

provide a connecter H arts, cheap to manufactur'e, easy Qfassemble which will not easily' get outoforder;

fjEur-ther objectswill appear, in the specication and the appended claims. ln'the drawings: 1 f.

Z Figurell is stop plan view of a connecter cap embodying my invention :Fig. 2 is a side elevation o fthe cap with a yfco'nductor cord attached thereto;

Fig. 3 is a'bottom view of the ca asshown inFig; 2,:thegcord being sectione on a line 00 corresponding to line 3--3 of Fig." 2

ig. 5 is a longitudinalfsectional view of Fig. 4, 81', portion of the casing being broken away,-and the conductor wires beingsho'wninserted in theblades in a positionto be secured thereto f taken substantially on line ]Fig. 6 is a sectionalperspective view taken i on 311118 corresponding) 5, the conductor wires eing' shownfin pos1-' tion in the blade sbetore being soldered Z.

place; p p F"g.'7 isa transverse section taken on a line corresponding'with line of Fig. land illustrates the position of. the wire after be ing securedin' the blade and the securing means therefor; A

Fig. S'isa perspective .view of one of the so blades before being secured in the base. 7

. Fig. 9 is aplan view showing a somewhat ,difl'erent form of construction; and

j Fig. 10 is a cross section on the line 10- -10 7 I of Fig. 9. r 86 Referring to the drawings in detail, the embodiment illustrated comprises an insulating base 1 having outwardly extending connecter blades '2 su orted thereon, and a'metallic casingor han 1e 3 secured thereto. The innal sectional view h to line 6- -6 of Fig.1

sulating base in the present instance consists of a comparatively thin insulating disc which may be stamped from sheet fibre, laminated bakelite or similar material or which may be made of molded composition.

The blades 2 are formed of suitable'fiat material and provided with an elongated slot 4, as illustrated in Fig. '8. Shouldersb are adapted to rest against the insulating base when the bifurcated. end of the blades are inserted in the slots 6, which latter are pierced in the disc 1. The ends of the blades 2 are riveted against the insulating base, as shown at 7, thereby securing the bladesfrigidly in the slots 6 in outwardly extending position. The casing 3 is preferably formed of metal and provides a shoulder 8 against which the base is secured by forming'aninwardly extending flange 9 thereover as illustrated.

The casing 3 is funnel-shaped and a substantially oval cord passage 10 is provided, which passage conforms to the contour of the standard extension cord. The lower end of the casing is also flanged outwardly at 11 to provide a suitable grip whereby the cap may be easily removed from the receptacle, the casing being headed to provide a smooth edge. These casings are preferably of alu minum and may be eleetro-plated by a comparatively new process which provides a plating in colors to harmonize with any color scheme desired.

It is desirable that the connecter caps should be permanently connected to the conductor cords of electrical appliances when they are prepared for market, and in practicing my invention the connecter blades 2 are first riveted securely in the insulating base 1. The casing 3 is then threaded over an extension cord 12 and a knot 14 may be tied in the cord to form a strain relief against the casing 3 after the device is assembled. The bared ends 13 of the conductor wires are then inserted longitudinally in the slots 4, as shown in Figs. 5 and 6. and are soldered therein. The solder 15 fills practically the entire length of the slot and forms a fiat surface on each side of the blade as illustrated in Fig. 7 Theinsula'ting base is then inserted in the end of the casing 3 and against the shoulder 8 and the flange 9 is formed over the base securely locking it in the casing. It will be noted that by this means the conductor wires extend longitudinally through the base and in the slot 4 and are confined withinthe limits of the cross sectional contour of the blades and a considerable length of the wire is secured to the blade by the solder, thereby forming a very secure joint both electrically and mechanically.

The construction shown in Figs. 9 and 10 is substantially the same as that just described, except that the insulating base is made in two semicircular halves 16 and 17 having opposed registering notches to accommodate the contact blades 18 which are notched out on opposite sides, as indicated at 19, to receive the edges of the adjacent portions of the insulating discs. This form may be assembled without any riveting 0 eration, as the two semicircular insulating discs are simply slipped into position with respect to the eontact'blades, a portion of the blade being received in the notch in the insulating disc and a portion of the insulating disc being received in the notch 19 in the blade.

When the metallic casing or handle 3 is flanged over the edges of the insulating disc the entire assembly is securely held in assembled relation.

Having thus described in invention, what I claim and desire to secure y Letters Patent 1s:

1. A connecter cap comprising an insulating disc, a bifurcated blade extending through said disc and riveted thereto and a conductor wire extending through said disc and between the bifurcations of said blade, and means for securing said wires between said bifurcations and within the cross section-- a1 contour of said blade.

2. A connecter cap comprising a comparatively thin insulating base, a connecter blade extending through said base and secured thereto, said blade having a lon itudinal slot therein extending through said base, aconductor wire in said slot and extending through said base, said wire being entirely within the cross sectional contour of said blade and secured in the slot above said base.

3. An attachmentplug cap comprising an insulating disc, a hollow sheet metal handle 4. A connecter cap comprising an insulating disc, a connecter blade supported in said disc and having a longitudinal slot therein, a conductor wire in said slot and secured longitudinally therein within the cross sectional contour of said blade, and a hollow sheet metal handle clamped on said disc and having a restricted passage for saidconductor.

5. A connecter cap comprising a funnelshaped sheet metal handle forming a casing for said cap, an insulating disc secured in and substantially closing the large end of said handle, an outwardly extending connecter blade extending through said disc and riveted thereto, said blade having an'open end slot in the riveted end thereof extending a sub stantial distance above said disc, a conductor wire extending longitudinally in said slot and soldered therein, said handle providing a conductor and flanged to provide a hand gri 6. In a conneeter cap, a flat conductor bla e having, an elongated longitudinal open end slot therein, shoulders on saidblade adjacent the slotted end, and an insulating base, the open end of said blade extending through said base and riveted over said base to clamp said base against said shoulders and retain said slot open to receive a conductor wire.

In witness whereof I have hereunto subscribed my name.

ROBESON B. WOLCOTT.

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