Apparatus for measuring screw threads by 3-wire method
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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Abstract
An apparatus for holding wires for measuring screw threads by the three wire method includes a body portion and a plurality of wire holder ears in a vertical position, the wire holding ears being responsive to rotational movement and the wire holder ears being limited in the rotational movement by weighted lower base portions provided on the bottom of the wire holder ears. A ledge is provided for holding the screw in position perpendicular to the orientation of the three wires in a position for the pitch diameter of the screw threads to be measured.
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Citations
24 Claims
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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:
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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 includes a 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An improved measuring apparatus for utilizing the three wire method of measuring pitch diameter of screw threads of a screw, comprising:
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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 including a pair of wire holder ears for firmly holding said respective three wires, separately in place within said wireholders, said wireholder ears removably attachable to said micrometer, said holders for said wires including a means to limit a rotational movement from the application of rotational force against said wire holder ears for said wires, a means for generally horizontally supporting said screw in spaced relationship away from said vertically oriented wire holder ears, said means for holding said screw permitting said vertically extending three wires to engage said threads of said screw, wherein said means to limit the rotation of said wires includes a 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification