PLUG BLADE STRUCTURE WITH A SHALLOW RECESS AND A REINFORCED GUIDE SLOT FOR FORMING AN INSULATING LAYER

摘要

A plug blade structure comprises an enclosed section (21-21E) and an exposed section (22-22E). The exposed section includes a wider front section (221-221E) and a narrower rear section (222-222E). The enclosed section includes a shallow recess (211-211E) in a front end thereof for filling molt en plastic material into the narrower rear section. A transverse through-hole (223-223E) extends from a face of the narrower rear section to the other fac e of the narrower rear section. A reinforcing guide slot (225-225E) is defined in the narrower rear section and communicated with the transverse through-hole. The transverse through-hole and the reinforcing guide slot guide the molt en plastic material from a face of the narrower rear section to the other face of the narrower rear section such that the air on the faces of the metal blade can be well expelled to thereby allow smooth injection and that the resultant insulting layer (220-220E) formed on the narrower rear section has flush surfaces.