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Apparatus for measuring screw threads by 3-wire method

  • US 5,317,809 A
  • Filed: 11/05/1992
  • Issued: 06/07/1994
  • Est. Priority Date: 11/05/1992
  • Status: Expired due to Term
First Claim
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1. An improved measuring apparatus for utilizing the three wire method of measuring pitch diameter of screw threads of a screw, comprising:

  • a plurality of at least three cylindrical wires, each said wire of said wires having an outer cylindrical surface capable of contacting a midpoint of a flank of each said screw thread of said screw threads between an outer edge and an inner edge of the screw thread, in a position, parallel to the lead angle of the screw thread,a base portion for holding a micrometer, a means to hold said wires in a generally vertical orientation during measurement, said means to hold said wires including a pair of wire holder ears for firmly holding said respective three wires, separately in place within said wire holders, said wire holder having ears removably attachable to said micrometer,said means to hold said wires including a means to limit a rotational movement from the application of rotational force against said wire holder ears for said wires,wherein said means to limit the rotation of said wires includesa generally U-shaped portion integral with said base portion, said U-shaped portion having a recess defining a restraining portion within which said wire holder ears are movable within a predetermined distance and further restrained in rotational movement outside of said predetermined distance.

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