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Method of manufacturing a screw connector

  • US 6,001,294 A
  • Filed: 08/11/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 11/24/1992
  • Status: Expired due to Term
First Claim
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1. A method of manufacturing a screw connector which comprises a connector body, a threaded nut embedded in said connector body and having a thread hole with a thread diameter, a front end face, a rear end face and an axis extending in forward and rearward directions of said connector body, a bolt insertion hole provided in front of said front end face of said nut to an exterior of said connector main body, for a bolt of a mating connector to be inserted therethrough to be screwed into the nut, and a tubular cap portion provided behind said nut, for accommodating a distal end portion of said bolt, said method comprising the steps of:

  • providing a metal mold for injection molding, a front mold and a plurality of rear molds, said front mold having (i) a small diameter portion with a rear end part of equal diameter to said thread diameter of said nut, (ii) an intermediate diameter portion being larger than said thread diameter of said nut, (iii) a large diameter portion and (iv) a step defined by the small diameter portion and the intermediate diameter portion, each rear mold of said plurality of rear molds having an upper end portion;

    inserting said small diameter portion into said thread hole of said nut so that said rear end part of said small diameter portion projects from said nut in the rearward direction and said step is brought into contact with a portion of said front end face of said nut to prevent said nut from moving forwardly;

    bringing said upper end portion of each rear mold of said plurality of rear molds into contact with a corresponding portion of said rear end face of said nut so that said nut is held by said step of said front mold and said upper end portion of each rear mold of said plurality of rear molds to prevent said nut from moving rearwardly and sidewardly;

    injecting a molten body of a resin into the metal mold to form said connector body such that (i) said bolt insertion hole is formed by said intermediate diameter portion of said front mold, (ii) said tubular cap portion is molded from inside by said small diameter portion of said front mold and said plurality of rear molds, said tubular cap portion being closed in a rear direction, and said plurality of rear molds forming a notched portion extending from a part of an outer circumference of a rear end portion of said nut to an exterior of said connector main body, and (iii) said connector body is molded with said nut embedded between said bolt insertion hole and said tubular cap portion; and

    separating said metal mold, said front mold and said plurality of rear molds from said connector body.

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