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Method for production of a helical spring from a fiber-reinforced plastic

  • US 4,434,121 A
  • Filed: 10/01/1981
  • Issued: 02/28/1984
  • Est. Priority Date: 10/01/1981
  • Status: Expired due to Fees
First Claim
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1. A method of making a helical spring which comprises the steps of:

  • rotating an inner cylindrical member formed with an outwardly open helical groove around the axis of said member;

    enclosing said inner member in an outer member formed with an axially extending bore provided with an inwardly open helical groove registering with the outwardly open helical groove to define a closed cross section for a spring to be formed in said grooves;

    feeding a strand of fiber reinforced synthetic resin in a plastically deformable state into said outwardly open groove thereby entraining said strand into said outer member and molding said strand to said cross section between the grooves of said members; and

    axially shifting said members relatively corresponding to the pitch of said grooves during the rotation of said inner member whereby a spring formed from said strand emerges from said outer member on said inner member at an end of said outer member opposite that at which said inner strand was entrained into said outer member.

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