Geometrical instruments – Gauge – Screw thread
Patent
1978-05-15
1980-02-26
Little, Willis
Geometrical instruments
Gauge
Screw thread
33143M, G01B 340, G01B 348
Patent
active
041898435
ABSTRACT:
A gauge for determining the pitch diameter of threads on pipe and tubing, for determining the taper of a thread on the pin or box end of tubular structures used in oil and gas exploration an production, and for determining the existence of an out-of-round condition at the location of the threads on such tubular structures. The gauge includes an elongated scale rail, a pair of blade blocks slidably mounted on the scale rail, and a pair of thread engaging blades pivotally supported on the blade blocks. Locking and adjusting elements are provided in association with the blade blocks for locking the blade blocks in a fixed spatial relationship to each other along the length of the scale rail, with the distance therebetween precisely adjusted to a predetermined value. A series of interchangeable blade stop plates are provided for individual cooperative interaction with the thread engaging blades and with the blade blocks to set the blades at a preselected angle in relation to each other in correlation to a specific thread taper dimension which is to be gauged. A set of interchangeable pitch diameter bars can optionally be provided for fixing the distance separating the thread engaging blades at a selected value corresponding to a predetermined pipe thread pitch diameter.
REFERENCES:
patent: 1950912 (1934-03-01), Aronson
patent: 2668359 (1954-02-01), Litchfield
patent: 2852856 (1958-09-01), Cox
patent: 3432935 (1969-03-01), Reish
Laney William R.
Little Willis
Mustang Services Company
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