US923179A - Separable attachment-plug. - Google Patents

Description

Patented June .1, 1909 H. HUBBELL. SBPARABLE ATTACHMENT PLUG. APPLIOATION FILED 001'. so. 1908.

\bw mm v lm ylimeoo eo z HARVEY HUBBELL, or ninnenron'r, CONNECTICUT.

.SEPARABIQE ATTACHMENT-PLUG.

' To all whom it may concern:

Be it known that I, HARvErHUBBEL-L, a-

T citizen of the United States, resid' at Bridgeport, county of Fairfield, State of onnecticut, have invented a new and useful 3 Se arable Attachment Plu'g, of which the fol owing is a specification This invention relates to separable attach" ment plugs for use in electric circuits, and has forits general objects to simplify and cheapenthe construction and to greatly re duce the size of the plug.

4 It isone of the objects of the invention to provide an attachment plu cap which maybe made from any ordinary plastic composition as hard rubber, so called, but which shall be provided with an insulatingheatresisting disk to which the electrical connections are attached thus giving to the structure all the In the accompanying drawing forming a making a advantages of hard rubber, so called, and

durable and perfectly safe structure. i

A further object of the invention is to providemea'ns for connecting the cable to the cap' in such a manner as to prevent theend of the cable fromv fraying and preventing the end of the cable from being partly pulled out from the cap and loose ends of the covering threads escaping.

A further object of the invention is to provide an attachment plug base in which the usual intermediate part of porcelain-within which the contacts .enga e may be dispensed with and the base shal be so constructed that the engagement of the contacts will take place. within the screw shell.

'With these andother objects in view-the invention consists in certain'cconstructions and in certain parts, improvements and combinations which will be hereinafter described and 'then specifically pointed out in the claim hereunto appended part of this specification, Figure 1 is 2. iongitudinal section of my novel attachment plug complete;. Fig. 2 a detail sectional view illustrating in connection with Fig. 1 my novel mode of attaching the cable to the cap;

- Fig. 3 an inverted plan view of the base with the screw shell removed; Fi 4 a plan view of the base of the screw she l removed; and

. Fig. 5-is a section on the line 55 in Fig. 1,

looking in the direction of the arrows. p ,10 denotes the cap as a whole, 11 the base asa whole-and 12 the cable. The capcomprises upper and lower parts indicated re- Specification' of Letters Patent; Application filed October 30, 1908. Seriai No. 460,239. I

ratmeaiune 1, 1909.

tlvely with male and female threads by which they are secured together. Both of these aarts may be molded from hard rubber, so'ca e I spectively by 13 and 14; and provided respec- I "115 denotes an internal recess in the .cap

intowhich the cable leads through a central hole 16in part 13.

L7 denotes the contact plates which are secured in the recess and extend through -material that will resist heat.

slots-1S in the bottom part 1 1 of the cap.

- An important feature of the present inven- :tion is-that the electrical'conneotions are attached to an insulatingheat-resisti washer indicated by 19. This washer may e made of mica, vulcanized fiber or any. insulating This insulating washer lies at the bottom of recess 15. Thebases of the contact plates, indicated by 20, are riveted or otherwise secured to the upper side of the washer and the plates themselves extend. throu h slots in the washer in alinement with s ots 18-inpart 14.

2 1 denotes the binding screws which en gage tliebases of the contact plates, and 22 the current wires which engage the.binding screws in the usual manner.

jAnotl1er important feature of the inven- I tion is the mode of conne'ctingthe cable to 1 the cap. 23 denotes a beveled recess in the under side of art 13 and surrounding the holefor the ca 1e and 24 denotes a soft rubber rin which ,lies in this recess and clamps the-end of the cable firmly when part 13 of the cap is screwed to place (see Figs. 2

' and 1). In assembling, the cable is passed through part 13 of the cap and the ring, as clearly shown in Fig. 2, the loose threads at:

the end ofthelc able being below the ring.

When the parts are secured together by".

means of the screw threads, this soft rubber ring will be compressed'between the binding screws, the bases of the contact plates, part 13 and the cable into a more or less triangular form in cross section, as shown in Fig. 1,

and will grip the cable tightly, wholly preventing the-loose threads at. the end of the cable from being pulled through the cap; inother words,

reventing the cable from be coming frayed above the cap.

Another and vitally important feature of the present invention is that the usual intermediate part of porcelain, lying wholly abovefthe screw shell, within which the engagernent of the contact plates with the contact springsgis made, is dispensed with and has heretofore been possible.

the engagementof the contact plates and contact springs is caused to take place with in 'thescrew shell. I thereby materially reduce the cost of construction and am enabled to make the attachment plug as a Whole approximately a third shorter than The base comprises an insulating block, preferably of porcelain, indicated'by 25, a cupped screw shellindicated by 26, and an insulating disk 27 ordinarily made of vulcanized fiber to which the screw shell is secured. -The upper end of the screw shell-is shown as reduced slightlyin diameter, as at 28, and said reduced portion is inclosed in an insulating ringf29 which rests upon the upper end of the threaded portion of the shell. The purpose of this ring is to prevent the hand from coming in contact with'thelive end of the-shell in making.

and breaking the connection. The insulating block is provided near its lower end with a shoulder 30 which supports a cylindrical insulating'lining indicated by 31 and over the outer edge of which the lower end of the screw shell is turned.

32 and 33 denote recesses in the insulating V block which receive the contact springs indicated by 34 and 35. Contact spring 34 is.

secured to the screw shell by a rivet 36 which also secures the screw shell'to insulating disk 27. The screw shell is secured to the insulating disk by additional rivets, one of which appears in dotted lines in Fig. 1. Contact s ring is secured -to the insulating block y means of a screw 37 which extends upward through the block and engages a nut 38. The screw shell and the insulating disk are provided with corresponding slots 39.

through which the contact p ates pass to engage the contact springs when. the cap and base are connected. The passage ofthe current, starting from the left binding screw, is

as follows: through the left contact plate for the passage of contact plates and contact springs within the body and attached to the body and screw shell respectively, which are adapted to engage the contact plates.

In testimony whereof I affix my signature, in presence of two witnesses.

\ HARVEY H BELL. Witnesses: I

A. M. WOOSTER, S. W. A'rrrERroNt

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