US1480072A - Separable attachment plug - Google Patents

Description

Jan. 8 1924. g I L48fl72 H. HUBBEL L v SEPARABLE ATTACHMENT PLUG Filed Feb. 16 1921 INVENTOR BY J ATTOR N EY Patented Jan. 1924..

Marian HARVEY HUBBELL, OF'BRIIDGEPORT, CONNECTICUT.

SEPARABLE ATTACHMENT PLUG.

Application filed February 16, 1921. Serial No. 445,407.

To all whom it may concern:

Be it known that I, HARVEY HUBBEIL, a citizen of the United States, residing at Bridgeport, county of F airfield, State of Connecticut, have invented an Improvement in separable Attachment Plugs, of which the following is a specification. This invention relates to separable attachment plugs and has for its principal object to simplify, cheapen and generally improve their construction.

A further object of the invention is to provide, in a separable attachment plug comprising the usual plug base, improved blade contacts and simple, inexpensive means for assembling the improved parts in the b se without screws or rivets. In plugs of t is type as heretofore constructed, each of the blade contacts has been formed of a pair of spring plates held together by rivets or screws, and thecontacts have been secured in place in the plug base by screws and nuts or similar means. In the present invention the spring plates, which may be made from.

strip stock to save the waste of material .occurring from blanking, are assembled loosely in the plug base, i. e, without first riveting them together. The ordinary screw shell is then screwed on the base, which is adapted to engage the ends of'thev plates of one of the contacts and hold them in assembled relation, the ends of the plates of the other contact being laced over an eyelet carried in the end 0 the base, which is then headed over outside the plates to hold them together and to afford the usual center contact for the plug.

With these and other objects in view, I have devised the simple and novel attachment plug I will now describe, refer-.- ring to the accompanying drawing forming a part of this specification, and usin reference characters to indicate the severa parts.

Fig. 1 is a view in elevation of my novel plug, showing a blade cap attached thereto;

Figs. 2, a bottom plan view of the plug;

Fig. 3, a top plan view thereof;

Fig. 4, a longitudinal section, on an enlarged scale, on the line 14 in Fig.2; and

Fig. 5 is a disassembled View of the various parts of my novel plug, shown in perspective and in their sequence of assembly.

1O denotes a plug base of ordinary design and construction, and'll a blade cap having blades thereon, not shown, adapted to enter apertures12 formed in one end of the base and engage the blade contacts. The base has an external thread molded thereon which receives a screw shell 13 in the usual 14 and 15 denote the blade contacts which lie in chambers 16 in the base, 14 indicating the contact to be connected to the screw shell and 15 the contact to be connected to an eyelet 17 centrally located in the end of the base. The blade contacts each comprise spring plates. 18 having facing U-shaped bends 19 formed at one end to present spring surfaces for engaging the blades of the cap, and having their other ends bent at an angle and parallel to form attaching flanges 20. It has been the custom to secure the plates of each contact together by rivets and to fix the contacts in place in the base by screws and nuts. The parts of the plug of this invention are so constructed as to do away with all riveting.

The eyelet 17 is centrally located in one attaching flanges of the spring plates of the contact 15 there are formedalined holes 21 which receive the protruding end of the eyelet when the contact'is placed in the base.-

The eyelet may be spun over outside the flanges, which secures the contact in place and also provides an eflicient center contact 'for a socket (not shown). A contact washer 22-may be placed outside the flanges and spun over on the washer, as shown in Fig. 4. It has been found practicable to make the washer convexoconcave and to make the eyelet of such length that when spun over it will overlie only the. ,inner portion ofthe washer and not extend to the face thereof, thus leaving the smooth surface of the wash-'- er to form the center contact.

Blade contact 14, as has been described,

.also comprises a pair of spring plates hav- 'over the end of the eyelet and the eyelet ed therein, their outer surface will be flush with the surface of the tie plate. In assembling the contact 14, the spring plates are placed together, the ends of the flanges inserted in the slot 24, and the flanges brought to lie in the depression, as willbe apparent from an inspection of Fig. 4. At the thread ed end of the base is a recess 26 in which the tie plate is seated, the plate lying flush with the end of the base, the outer edge of the tie plate being rounded off to conform to the curvature of the base. After the tie plate has been located on the attaching flanges of the spring plates, the contact is pushed into the chamber 16 until the tie plate is seated in recess 26. The screw shell is then turned onto the base, and the usual overlying flange 27 on the shell then bears against the tie plate and the outer attaching flange seated in the tie plate, thus rej taining the partsin assembled relation and preventing them from being removed from the base. To permanently lock the shell, the

blade contact 14 and the tie plate to thebase, an indentation, as at 28,- maybe punched from the flange 27 ofthe shell into apertures 29 formed in the attaching flanges and in the tie plate.

It will be obvious that I have provided an improved attachment plug which is much cheaper to manufacture andwhich is more easily assembled than plugs of previous construction. The contact plates of this invention are simple in construction and may be cut from strip stock of the'desired width, which featurealone involves'a considerable saving of material as compared with the old types of contact plates which have been necessarily blanked out from sheet stock to provide the ordinary attaching means at the end of the plates. It will be noted that in assembling the improved plug there is no machine work or riveting required to hold the parts together except spinning over the eyelet and indenting the shell.

Having thus described my invention, I claim:

1. In an attachment plug, a blade receiving contact comprising a pair of spring plates, attaching flanges on said plates, and a tie plate having a slot to receive the spring plates and a depression which receives said flanges in superimposed relation and keeps their outer'surface flush with the surface of the tie plate.

2. In an attachment plug, a base, a blade receiving contact comprising a pair .of spring plates having attaching flanges, a tie plate having a slot through which the flanges are passed, a depression at one side of the slot in which the flanges are seated, and meansfor attaching said parts to the base. 7

3. An attachment plug comprising a base, a screw shell having threaded engagement with the base and provided with a flange, a

blade receiving contact comprising a pairv of spring plates having overlying slotted attaching flanges, a tie plate having a slot through which the flanges are passed, a depression at one side of the slot in which the flanges are seated, and an aperture, the shell,

contact and tie plate being locked in place on the base by an indentation struck from the flange of the shell into the slots in the attaching flanges and the aperture in'the tie plate.

4. An attachment plug comprising a base, a screw shell having threaded engagement with the base and provided with a flange, a blade receiving contact comprising spring plates havingattaching flanges, and a tie plate having a slot through which the v flanges are passed and a depression at one side of the slot in which the flanges are seated, said parts being retained in place by the flange on the screw shell.

In testimony whereof I affix my signature.

HARVEY HUBBELL.

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