Abstract:
A premold for a receptacle for an electrical male plug includes valving means on particular contact cooperative valving portions and through ground pin receptacle expansion.

Description:
This invention relates to receptacles for electrical plugs, and more particularly to premolds for use in the manufacture thereof. 
     BACKGROUND 
     Prior art premolds for plug receptacles have incorporated bent, slotted “blades”, as does the present invention, but have required two rigid polyvinyl plastic elements, ultrasonically welded together, a requirement greatly more labor intensive than the present invention. 
     SUMMARY 
     It has been discovered that incorporating a “gate” in the blades, on one half and working with the other as its seat, a receptacle premold may be provided with great efficiency and greatly diminished labor intensity. 
     In another aspect, it has been discovered that a ground receptacle may be gated by combining a longitudinal outwardly extending rib with an opposed longitudinal split to work in combination with a mold load pin. 
    
    
     DRAWINGS 
     Turning now to the presently preferred embodiment of the invention, there is shown in: 
     FIG. 1, an exploded isometric view thereof; 
     FIG. 2, a sectional view at  2 — 2  of one element of FIG. 1; 
     FIG. 3, a sectional view at  3 — 3  of another portion of FIG. 1; and in 
     FIG. 4, a sectional view at  4 — 4  of the plastic housing of said embodiment. 
    
    
     DESCRIPTION 
     Shown in FIG. 1 is a rigid plastic housing  10 , molded conventionally of a polycarbonate composition and including an opening  12  for a ground pin contact  14  and two openings  16  for identical contact pins  18 . 
     Each ground pin  14  includes a cup  20  for crimping around a wire bundle, an outwardly directed cylindrical indentation  22  (which facilitates use alternatively with a round ground pin), a peripheral circumferential outwardly extending rib  24  and is formed of flat sheet stock formed into abutting unsealed relation at joint  28 . Neck  30  joins cup  20  to the rest of the contact. Flexible inclined plane stop  32  prevents a pin from backward movement. 
     Each contact pin  18  includes a wire crimp cup and a blade portion  34  bent at one end  36  to provide two generally parallel sheets intermediately correspondingly slotted (at  37 ) to accept one blade of the pair carried by a male electric plug. Each pin  18  also carries an inclined plane stop  40  to engage abutment  42  to prevent backward movement of the pin. 
     A narrower tongue  43  at the end of one of said sheets engages notch  44  of “door”  46  at the corresponding end of the other of those sheets to prevent flow of plastic in overmolding. Resilience of this blade and of the housing  10  (despite its relative rigidity in cooperating with pin stops) may provide a spring action useful in biasing the two portions of the contact pins toward each other. 
     In overmolding, conventionally, mold load pins are used conventionally to close housing holes  50 ,  52 , and  54 , except that the load pin closing hole  54  in the present invention extends also into ground pin  14  to expand its circumference through cooperation with rib  24  and slot  28 . The aftermold die surrounds the entire premold assembly shown in FIG.  1 . 
     This invention also facilitates the mounting of a neon light bulb in a premold itself: all that need be done is to interpose its two wires between two male blade receptacle portions  34  and the adjacent housing portions.