US1545313A - Attachment plug - Google Patents

Description

G. w. GOODRIDGE ATTACHMENT PLUG Filed May 12. 1924 July 7, 1925.

ATTORW Patented July 7, 1925.

UNITED STATES PATENT OFFICE.

GILBERT w. GOODRIDGE, F FAIRFIELD, CONNECTICUT, ASSIGNOR TO THE BRYANT ELECTRIC COMPANY, or BRIDGEPOBT, CONNECTICUT, A CORPORATIQN or con- NECTICUT.

ATTACHMENT PLUG.

Application filed May 12, 1924. Serial ire/7125271 To all whom it may concern:

Be it known that .I, GILBERT W. Goon- RIDGE, a citizen of the United States of America, residing at Fairfield, in the county of Fairfield and State of Connectiout, have invented certain new and useful Improvements in Attachment Plugs, of whichthe following is a specification.

My invention relates to attachment plugs, and particularly to a separable attachment plug. The object of my invention is to improve the construction of the body of the plug and its associated contacts/in certain particulars hereinafter described or shown in the accompanying drawings, in

which Fig. 1 is a view showing the body of the I plug in side elevation, and the cap detached and in perspective;

Fig. 2 is an axial section through the plug showing the cap and 'body members ene s Fig. 3 is a section through the body, of-

the plug, partially in section and at right angles to the section shown in Fig. 2;

Fig. 4 is an interior plan of the end button of the plug body;

Fig. 5 is an interior plan of the insulating block of the plug body, showing the contacts in position; and

Fig. 6 is a detached perspective of the contacts of the lug body.

In the form' liere shown the plug comprises separable cap and body elements a and Z) respectively. The cap is in general of standard type, comprising an insulating base apertured at 16 to accommodate a cable'end and provided on its inner face with ledges upon which are seated the wire terminal plates 17 and 18. Integral blades 19 and 20 project from the terminal plates ang serve to engage the contacts of the plug bo The body I) of the plug comprises a main insulating block 21 and a cooperating end button 22 independent thereof. The button 22 is secured in position by a stud or rivet 23, the head of which is molded into the block 21 while its projecting shank passes through an axial hole in the button 22, and its spread end 24 serves as the center contact of the plug body.

The screw shell contact 25 sleeves upon the block 21 and abuts against a penpheral shoulder 26, while its diaphragm 27 overlies the endof the block 21 and is engaged and secured against same by the button 22 when the latter is riveted in position. In order to prevent relative rotation of the screw shell and block, tongues 28 offset recesses 29' from the diaphragm 27 enter formed in the end of the block.

The spring metal contacts 30 and 31 of the plug body which receive the blades 19' firmly against the diaphragm by the butv ton 22 when the latter is riveted in position. In order to insure a good electrical connection between the screw shell and contact, and also to aid in holding the contact in position in the well 32, the base 36 of the contact is slotted to form a tongue 38 which is offset from the base 36 and projects slightly toward the button 22. The pressure of the button against the tongue 38 not only forces the-base 36 more firmly against the diaphragm 27, but it also forces the contact 30 toward the wall of the well [32' against which the blade of the cap rests in inserted position, and thus nsures a better contact therewith.

A barrier rib 39 located adjacent the base flange 36 of contact 30, and accommodated in a corresponding recess 40 in the inner face of the button 22, spaces the contact 30, and also the screw shell web 27, from the stem of the center contact rivet 23.

Electrical connection between the contact 31 and the center contact rivet 23 is established by the offset base flange 41 of the contact. The flange is apertured at 42 to snugly fit the shank of the stud 23, and 1s held firmly against the end of the block 21 by the button 22 when the latter is riveted in place. The hole 42 may be of slightly less diameter than the stem of the rlvet and the flange slotted to form a tongue 43. T1115 n y P mi s the stud to pass through the hole, the tongue 43 being s rung for this purpose, but the pressure of the button 22 against the tongue forces the latter strongly a ainst the stud and thus establishes goo electrical connection therewith. The spring efiort of the tongue also aids in pressing the contact 31 against the inserted blade of the cap.

To facilitate the entry of the cap blades into the guideways 34 and 35 which lead to the contact chambers 32 and 33, the outer or cap end of the block 21 is dished at 44. The concave surface thus afforded centers the cap with respect to the plug body when held in alignment therewith. The blades are thus aligned with the guideways'34 and 35.

It will be observed that the plug body requires but a single securing member to hold all of the parts together, and that that securing member forms the center contact member of the plug. The parts are all rugged, inexpensive to manufacture and assemble, and good electrical connection is maintained not only between the screw shell and center contact and their related receptacle contacts, but also the receptacle contacts are spring pressed into such position that they make good electrical connection with the inserted blades of the cooperating cap.

With the understandin that the construction shown may be varied in proportion and shape of parts, and in many details of construction without departing from the thoughts which underlie my invention, I claimv 1. An attachment plug comprising a block of insulating material pierced to afford a pair of contact chambers opening to one end of the block, and apair of guideways opening from said chambers to the opposite end of the block, a center contact stud carried by the block and projecting from one end thereof at a point between said chambers, an insulating button secured by said stud against one end of the block, and a spring metal contact arranged in one of the chambers of the block and having a base flange engaged between said button and block, said base flange being apertured to accommodate said stud and having a tongue displaced into good electrical contact with said stud by the pressure of the end button there against in the assembled condition of the parts.

2. An attachment plug comprising a block of insulating material pierced to afford a pair of contact chambers opening to one end of the block and a air of guideways opening from said cham ers to the opposite end of the block, a center contact stud carried by the block and rojecting from one end thereof at a point Between said chambers, an insulating button secured by said stud against one end of the block, a screw shell side contact sleeved on the block and having an end diaphragm partially overlying one end thereof and engaged by the'button, a flange offset from said disphragin and engaging a recess in the end of the block to hold the screw shell against rotation on the block, and a spring metal contact arranged in one of the chambers of the block and passing through the screw shell diaphragm, said contact having a base flangeengaged by the button and pressed thereby against the dia phragm to establish good electrical connection therewith in the assembled condition of the parts.

3. An attachment plug comprising a block of insulating material pierced to afford a pair of contact chambers opening to one end of the block and a pair ofguideways opening from said chambers to the opposite end of the block, a center contact stud carried by the block and projecting from one end thereof at a point between said chambers, an insulating button secured by said stud against one end of the block, a screw shell side contact sleeved on the block and having an end diaphragm partially overlying one end thereof and engaged by the button, a flange offset from said diaphragm and engaging a recess in the end of the block to hold the screw shell against rotation on the block, and a spring metal contact arranged in one of the chambers of the block and passing through the screw shell diaphragm, said contact having a base'flange engaged by the button and pressed thereby against the diaphragm to establish good electrical connection therewith in the assembled condition of the parts, said base flange having a portion thereof offset toward the button to insure a good electrical contact between the base flange and the screw shell diaphragm, and also to increase the effective engagement. between the contact and the blade of an associated cap.

In testimony whereof I have signed my name to this specification.

GILBERT W. GOODRIDGE.

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