US2170131A

US2170131A - Shielded telephone plug

Info

Publication number: US2170131A
Application number: US217215A
Authority: US
Inventors: Cornelius W Doremus
Original assignee: Individual
Current assignee: Individual
Priority date: 1938-07-02
Filing date: 1938-07-02
Publication date: 1939-08-22
Anticipated expiration: 1956-08-22

Description

Aug. 2 2, l939.` c. w.. D`oREMUs v.2,170,131

SHIELDED TELEPHONE 4PLU@ FiledJuly 2, 1938 Hnnnnnnnnnnnnl' l INVENTOR CORNELIUS W. DOREMUS ATTORNEY Patented Aug. 22, 1939 UNITED STATES Ziltdl rATENT orricr 4 Claims.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 0. G. 757) This invention relates to a shielded telephone plug, and has for an object to provide a practically indestructible rubber covered telephone plug which can be manufactured more economically and will have afar longer useful life than the present known type of breakable telephone plugs. z

A further objectof this invention is to provide a telephone plug having its'body made preferably of soft molded rubber, which hence cannot be easily broken, and, further which is provided with an efficient grounding medium for a shielded telephone cord, which grounding medium serves as a cord tie bracketwhen used with an unshielded telephone cord.

With the foregoing and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter described and illustrated in the drawing, in which,

Fig, l is a longitudinal sectional view of the plug of this invention on line I-I of Fig. 3;

Fig. 2 is a longitudinal sectional view at right angles to the View of Fig. 1, being on line 2-2 of Fig. 3; and

Fig. 3 is an end View of the telephone plug.

There is shown at I the telephone plug of this invention, which includes a stem Il, preferably made of brass, and having a ball head tip I2 at one end thereof, and is threaded as at I3 at its other end, whereby it is secured in a terminal I4. Surrounding the stem II is a barrel I5, likewise of brass. This barrel I5 is separated from Vthe stem I I by means of an insulating sleeve I6, preferably of rubber, and from the ball head I2 by means of an insulating washer I 1. The other end of the barrel I5 is provided with a shoulder I8 separating it from an enlarged trunk I9, which finally ends at one side in a terminal 2D. The

trunk I9 is provided with a pair of recessed` grooves 2|. The trunk I9 is separated from the terminal I4 by rubber insulation 22 and the termina] I4 is similarly separated from the terminal Z by rubber insulation 23.

A rubber body 24 of semi-soft rubber is molded about the trunk I9 and terminals I4 and 20, being anchored thereto by the recessed grooves 2 I. Embedded in the rubber body 24 is a grounding spring 25 shaped somewhat in the form of a Y, having its Y stem 26 extending at the end of the body 24 and formed into an eyelet 2'I. The ends of the Y legs extend outwardly of the cylindrical body 24 as at 28, having their tips 29 curved back into the body as shown, the body being cut away in an aperture 30 under the ends 28.

The terminals I4 and 20 are each provided with female plug receiving recesses 3|, access to which are had for the telephone cord terminal tips by means of cylindrical passages 32 connecting thereto. Each female terminal 3l has a threaded aperture 33 extending through a side 6 thereof for reception of a terminal holding screw which may beiinserted and countersunk through apertures 34 in the side of the body 24.

In operation, the parts of the telephone plug are assembled as above described. If used With l0 a shielded telephone cord, the shielding is connected to the eyelet 2T of the grounding spring 25. The plug lil is placed in its jack in the usual manner with the sleeve l5 and ball head I2 serving as contacts as conventional, the shoulder I8 15 limiting the entrance ofthe plug into the jack to just the predetermined amount and likewise making a click sound as the plug is pushed home into the jack, thereby informing the user that the plug is properly in position within the jack. 20

The yieldable ends 28 of the grounding spring 25 make contacts with a suitably positioned grounding portion of the jack, and thus ground the shield of the shielded wire, preventing stray electrical impulses from interfering with the 25 proper operation.

If used with an ordinary unshielded telephone cord, the eyelet 2l serves as a cord tie bracket to prevent the telephone tips from being accidentally withdrawn from the terminals I4 and 2U. The 30 telephone of this invention thus serves interchangeably for both shielded or unshielded telephone cords, and furthermore, will stand up under extreme service conditions, inasmuch as it has no easily frangible parts. 35

Other modifications and changes in the proportions and arrangements of the parts may be made by those skilledv in the art without departn ing from the nature of the invention, within the scope of what is hereinafter claimed.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

Having thus set forth and disclosed the nature of this invention, what is claimed is:

l. A telephone cord plug comprising a stem contact and a barrel Contact encompassing said stem contact, an insulating sleeve between said barrel contact and said stem contact, an enlarged trunk extending from said barrel Contact and a cord tip-receiving terminal extending from one side of said trunk, a second cord tipweceiving terminal, said stem being secured to said second terminal, insulating means separating said second terminal from said trunk and said rst terminal, a shoulder dividing said trunk from said barrel to limit the amount that the plug may be inserted in a jack, and a yieldable insulating material molded about said trunk and terminals in situ and having apertures allowing insertion of cord tips into said cord tip-receiving terminals, said trunk having a plurality of grooves thereabout to anchor the molded insulating material thereon, said molded insulating material comprising semi-soft rubber.

2. A telephone cord plug comprising a stem Contact and a barrel Contact encompassing said stem contact, an insulating sleeve between said barrel contact and said stem contact, an enlarged trunk extending from said barrel contact and a cord tip-receiving terminal extending from one side of said trunk, a second cord tip-receiving terminal, said stem being secured to said second terminal, insulating means separating said second terminal from said trunk and said first terminal, a yieldable insulating material molded about said trunk and terminals in situ and` having apertures allowing insertion of cord tips into said cord tip-receiving terminals, and a cord shield grounding means extending through said molded insulating material,

3. A telephone cord plug comprising a stern contact and a barrel contact encompassing'said stem contact, an insulating sleeve between said barrel Contact and said stem Contact, an enlarged trunk extending from said barrel Contact and a cord tip-receiving terminal extending from one side of said trunk, a second cord tip-receiving terminal, said stem being secured to said second terminal, insulating means separating said second terminal from said trunk and said rst terminal, a yeldable insulating material molded about said trunk and terminals and having apertures allowing insertion of cord tips into said cord tip-receiving terminals, a cord shield grounding means extending through said molded insulating material, said grounding means having an eyelet extending through an end of the molded insulating material for connection to a'shield to be grounded, and a yieldable portion extending through a side of the insulating material to ground the same.

4. A telephone cord plug comprising a stem Contact and a barrel contact encompassing said stem contact, an insulating sleeve between said barrel contact and said stem contact, an enlarged trunk extending from said barrel contact and a cord tip-receiving terminal extending from one side of said trunk, a second cord tipreceiving terminal, said stem being secured to said second terminal, insulating means separating said second terminal from said trunk and said first terminal, a yieldable insulating material molded about said trunk and terminals in situ and having apertures allowing insertion of cory tips into said cord tip-receiving terminals, a cord shield grounding means extending through said molded` insulating material, said grounding means comprising a Y shaped spring having its Y legs extending outwardly through opposite sides of the molded insulating material and having its tips turned back inwardly to the material again to provide yieldable grounding contacts. Y

CORNELIUS W. DOREMUS.