US 2019/0293401 A1Published application

Threaded-hole inspection device

AssigneeDai-Ichi Sokuhan Works Co.

InventorsMamoru HARA, Yasuo SATO, Atsushi SATO, Tetsuya HORIUCHI, Teruyuki MIYASHITA, Takao HAYASHI, Kenji MIYAMORI, Koji MIYAMORI, Mamoru WATANABE

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Abstract

Provided is a threaded-hole inspection device having high inspection precision. An incomplete thread ridge portion of a gauge portion 5 of a thread gauge 1 is removed, a phase-positioning portion 8 for positioning a tip-side start point 7 of a complete thread ridge at a prescribed phase when the thread gauge 1 is mounted on a rotating-shaft portion 2 is provided to a fastening portion 6 of the thread gauge 1 that is to be fastened to the rotating-shaft portion 2, and a phase-positioning engaging portion 9 that is to engage with the phase-positioning portion 8 is provided to the rotating-shaft portion 2. A depth of a threaded hole 4 to be inspected is measured on the basis of a number of rotations and thread pitch of a rotating-shaft-feeding mechanism 18 that, via threaded engagement, feeds the rotating-shaft portion 2 in a threaded-hole-approaching direction, which is a direction of approach toward the threaded hole 4, the rotating-shaft portion 2 being caused to rotate by a rotary drive portion 3, and on the basis of a distance over which an outward-moving portion 23 moves outward from the threaded hole, and the depth of the threaded hole 4 is calculated.

Claims10

Dependent claims

A threaded-hole inspection device comprising a thread gauge, a rotating-shaft portion on which the thread gauge is detachably mounted, and a rotary drive portion that rotates the rotating-shaft portion to rotate the thread gauge mounted on the rotating-shaft portion, the threaded-hole inspection device being configured so that:

the thread gauge is twisted into a threaded hole to be inspected;
a depth dimension of the threaded hole is measured on the basis of a number of rotations from when twisting of the thread gauge into the threaded hole starts until the twisting is complete, and on the basis of a thread pitch of the thread gauge;
and the depth dimension of the threaded hole is inspected;
wherein the threaded-hole inspection device is characterized in that:
the thread gauge is configured so that a gauge portion to be twisted into the threaded hole is provided to a tip portion of the thread gauge, and a fastening portion that fastens to the rotating-shaft portion is provided to a base portion of the thread gauge;
the gauge portion is configured so that an incomplete thread ridge portion produced on a tip portion of the gauge portion during formation of a thread is removed;
the fastening portion is configured so that a phase-positioning portion is provided thereto, the phase-positioning portion positioning a tip-side start point of a complete thread ridge portion of the gauge portion at a prescribed phase when the thread gauge is mounted on the rotating-shaft portion;
and the rotating-shaft portion is provided with a phase-positioning engaging portion that engages with the phase-positioning portion.

5 more elements

A threaded-hole inspection device characterized by having:

a thread gauge;
a rotating-shaft portion on which the thread gauge is detachably mounted;
a rotary drive portion that rotates the rotating-shaft portion to rotate the thread gauge mounted on the rotating-shaft portion;
a rotating-shaft-feeding mechanism that, by threaded engagement, feeds the rotating-shaft portion in a threaded-hole-approaching direction, which is a direction of approach toward a threaded hole to be inspected, the rotating-shaft portion being caused to rotate by the rotary drive portion;
and an outward-moving portion that, when a difference is created between a distance over which the rotating-shaft portion fed by the rotating-shaft-feeding mechanism is fed and a distance over which the thread gauge mounted on the rotating-shaft portion advances, moves outward from the threaded hole in a direction opposite to the threaded-hole-approaching direction commensurately with the difference in the distances;
the threaded-hole inspection device being configured so that a depth of the threaded hole is measured on the basis of a number of rotations and thread pitch of the rotating-shaft-feeding mechanism and on the basis of a distance over which the outward-moving portion moves outward from the threaded hole, and the depth of the threaded hole is inspected.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/345,476Filed 30 Oct 2017
Priority: JP 2016-2173487 Nov 2016
Published: 26 Sep 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G01B 3/48
Plug gauges for internal dimensions with engaging surfaces which are at a fixed distance, although they may be preadjustable: for internal…
G01B 5/18
Measuring arrangements characterised by the use of mechanical techniques: for measuring depth
G01B 5/204
For measuring contours or curvatures: of screw-threads
G01B
Measuring length, thickness or similar linear dimensions