US1668583A - Plug - Google Patents

Description

May 8, 1928.

A., J. CARTER PLUG Filed July e, 1925 Patented May 8, 1928.

'UNITED STATES PATENT ori-lcs ALvA J. CARTER, or CHICAGO, ILLrNoIs, AssIGNOn To CARTER nanro COMPANY, or CHICAGO, ILLINOIS, A CORPORATION or ILLINOIS,

PLUG.

Application med July e,

My invention relates to plugs and more particularly to an .electrical plug particularly useful in connection with radio receiving apparatus.. y

Itis a purpose of my invention to provide a plug that is adapted for kcooperation with a 'jack such as used in connection with radio receiving apparatus and telephone apparatus having a tip and a sleeve that are insulated from each other, said insulating means spacing said tip and sleeve `from each other and being of smaller Vdiameter' than said tip and sleeve to prevent short circuiting of vthe plug across the insulation. This short circuit iscaused frequently due to the fact that the metal of the springs forming the contacts of the jaclr is deposited on the insulating member due to the spring scraping overthe same thus making a line or continuous mark of a metal coating or deposition the insulating member between the tip and the sleeve causing a short circuit betweenthe tip and the sleeve. lBy setting the insulating member inwardly, contact of the springs with the insulating member is prevented thus preventing the deposit of instal thereon. y

Y It is another' purpose of the invention to provide a plug of the above mentioned character that isprovided with the contacts seated in suitable openings in the body portion of the plug With which the plugs or terminals are adapted to cooperate to connect the receiver or other sound reproducing 'da vice electrically with the tip and sleeve of the plug and to provide resilient means for forcing said plugs or terminals into engagement with said contacts.- Said yresilient means preferably comprises a U-shaped insulating Lmember of flexible material between the legs ofwhich is mounted a springtending to force the same apart- Preferably, the openings in the body portion ofthe plug are in the form of passages or channels that converge inwardlyk and are provided with abutments or fulcrums Opposite the contacts so that When the plugs or terminals on the receiver or other sound reproducing means arein'serted and, engage: with the Ushaped member,` the resilient ineens tilts saidv ter 1925. serien No. 41,692.

minals or plugs around the abutments or fulcrums to force the saine into engagement with the contacts. The resilient means lies inwardly of the abutments and the con tacts lie outwardly thereof.

It is another purpose of the invention to provide a plug having a sleeve portion projecting therefrom with means for securing a contact thereto and to the body portion of the plug that simultaneously secures the G sleeve to lthe body portion of the plug.

'Other objects and advantages of the invention will appear as the description of thc accompanying drawing proceeds. However'.7 l desire to have in distinctly understood 65' that l do not intend to limit myself to the exact details shown or described, ybut that l intend to include as part of my invention all such obvious changes and modications n of parts as would occur to a person skilled 7e with this art and as would fall within the scope of the claims.

1n the drawings: n

Fig.` 1 is a plan view of my improved plug with the cover removed;

Fig. 2 is a section thereof taken on the line 2-2 of F ig. 1 showing the cover in position; l Y Y I Fig. 3 is a perspective view of one of the contacts usedrinm the plug; and p i Fig. 4 is a similar view of the other contact.

Referring in detail to the drawings, my improved plug comprises anybody portion of insulating material which has a hollow S5 boss 11 projecting therefronr* VrExtending outwardly-.from `the v boss 11v is the sleeve M12 of conducting materialuwhich is provided with ja reduced portion 13" top provide a shoulder 1&1 adaptedto engagewiththe out- 90 er end of the boss 11. Mounted withinthe outer end of the slee-ve 12 isan insulating sleeve 15 having a reduced portion 1 6 entering the end of the sleeife 1Q y.and an Ven- ,y larged portion ,17`of smaller diameter than 95 the outer diameterof the `sleeve 12. The sleeve 15 is provided forspacing the ex,- tension 18y of the tip 19 from the sleeve 12. The tip1v9`is of the usual outer `contourfor n, tips of telephone plugs and is provided With 100l a cylindrical portion 2O ot substantially the same external diameter of the sleeve 12. blaid tip is further provided with a concave annular groove 21 tor receiving the convex end 22 oi the insulating member' 15.

Contact 23 having the fiat ear 24 thereon lying adjacent the inner :tace 25 ot' the lz-ody portion 1l) is provided in said plug. trl-aid contact 23 is secured in electrical contactwith the sleeve 12 and the sleeve 12 and the Contact 23 are secured to the body portion by upsetting or riveting over the sleeve 12 as indicated at 25 thus clamping the contact 23 and the boss 11 between the shoulder 14 and the head E25 on the sleeve 12.

rEhe body portion 10 is provided with a pair of channels 25 and 27 that converge troni the open end thereof toward the inner portion ot the plug and open up into the einarged recess or opening 28 which lies on the opposite side ot' the central opening .in the boss 1l from the passages 26 and 2T. The Contact 23 lies in the passage 26 and isprovided with a. right angular end portion or linger 28 projecting into the passage 26.

rilhe extension 1S has an insulating sleeve 2S mounted thereon which provided with :i reduced end portion fitting between the ste-ni 18 and the sleeve 12 to space the same at the inner ends thereof. The inner end ot the member 18 is threaded as indicated at 30 and the ear 3l on the contact member 32 niounted thereon in engagenient with the insulating sleeve 28, said sleeve spacing the contacts Q3 and trom each other. rlhe nut 33 screw-tlireadedly engziiges with the 'threaded end El() oit the member 18 to clamp the contact 23 in cngagcnieut "herewith The cars 2l and 3l ot the contacts "ill and 32 lio in a recess bfi; termed beu'ecu the wall 55 and the projeclion .fili ot the body portion 1li, the side walls oli said ears converging' as indicated at il? and and and lll respectively. The nuts ot the ears are rounded as indicated at ll and elf. and Si and i4 respectively to contorni to the curved faces ot the projection titi and the wall 35. The ear 2l is provided with an opening Li5 ot a to receive the sleeve 1:2 and the car Si is provided with an opening et@ ot a size to receive the stom 1S. The contact 8;? is prrwidcd with a projection or linger Ll? corresponding to the linger 28 on the contact Q3 and lios in the. opening or passage 27.'

Mounted between the ears :25 and 31 and having a curved bight portion eS is the ll-shaped insulating member 49 which is provided with tlaring leg portions 50. rihe curved portion 48 thefeorp lies substantially in yement i h the carved wall portioz' o a coiL compression spring 5l lies between the legs 5l) of the member 49 between the projection 36 and the rear wall portion oi the plug. An inward projection j irovided on the wall portion 5:2 to hold the spring 5l in position. The movement ot the member L19 sidewise is limited by engagement ot the legs 50 with the converging walls 54 ot the recess 2S.

vit will be noted that ol'tsets or abutnients are provided at 55 between the converging wail portions 5l and the converging wall portions 5G ot the passages 26 and 27. Upon retort to l? ig. 1 it will be seen that when the plu s or terminals 57 having the reduced end portions or tips 58 are inserted in the openings 2T and 26, the extreme end portions thereof will lirst engage with the member Li9 as shown at the left ot Fig. 1, the enlarged rear portion of the plug 57 sliding over the linger el? or Q8, as the case may be, ol" the Contactin the passage. This continues until the end oit the enlarged poltion of the plug or terminal 57 passes the finger on the Contact 23 or 32 whereupon the same will tulcrum around the abutment due to the action ol" the spring 51 causing the plug to snap in back of the nger on the contact as shown at the right of Fig. 1. thus securely locking the terminal in position and making a good contact between the terminal on the conductor 59 and the -ontact Q3. lllhen it is desired to disen 'age the terminal or plug 5r from the cona with which it is in engagement, all -lia is necessary is to pull the same laterily away trom the center oiI the plug compressing the spring 51 and tilting the member 5l so that the enlarged end thereof will pass the iingeron the contact.

The plug is closed by means of the insulating cover member 6() which engages with the body portion l() and which is provided with a. central recess lll to provide room Ytor the members Elli and Any suiti able securing de rices are. used tor securing the cover (il) on the bodyv portion il), the openings (l2 being provided in the body por tion lll tor the recept-ion ot said securing means.

liiaving thus described my invention what l desire to claim and secure by United States Letters Patent is:

1. 1n a plug` ol' the character described, an insulating body portion, a pair of contacts mounted therein, terminal receiving openings in said body portion in which said contact-s lie and resilient means tor moving the terminals in said openings into engagement with said contacts comprising a U- sbaped flexible member having a spring mounted between the arms thereof.

2. In a plug of the character described, an insulating body portion having a pair of converging passages therein, a Contact lying adjacent one oi the walls ot each of said passages, and resilient means engaging terininals inserted in Said passages to move l'lie saine into engagement with said contacts.

In a plug' of the Character described, an insulating body portion having a pair of converging passages therein., a Contact lying adjacentone of the Walls of each of said passages, an abutment on the walls of each of said passages opposite said contants, and resilient means engaging terminals inserted in said passages inwardly of said abutnients to force said terminals into engagement with said concacts.

In Wit-ness whereof, I hereunto subscribe my naine this 2d day of July A. D., 1925.

. e ALVA J. CARTER.

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