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 and an exposed section. The exposed section includes a wider front section and a narrower rear section. The enclosed section includes a shallow recess in a front end thereof for filling molten plastic material into the narrower rear section. A transverse through-hole extends from a face of the narrower rear section to the other face of the narrower rear section. A reinforcing guide slot 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 molten 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 formed on the narrower rear section has flush surfaces.