Gauge for tapered threaded box and pin ends of a joint

Details Gauge for tapered threaded box and pin ends of a joint Gauge for tapered threaded box and pin ends of a joint

1980-10-17

1982-11-02

Little, Willis

Geometrical instruments

Gauge

Screw thread

33174E, 33169B, G01B 336

Patent

active

043566367

ABSTRACT:
A thread gauge for determining the proper length, taper, and diameter of a threaded member located on the marginal box and pin end portions of joints of casing or tubing. The threaded member of a joint usually has a thread length which can be defined by the distance the threads extend respective to a vanish point located near the end of the joint. The pin gauge of this disclosure is a conical body which has a smooth internal surface formed between a large and small diameter shoulder. The smooth surface defines a frustum of a cone. The box gauge is a second component of this invention, and has an external tapered surface formed between spaced shoulders which defines a frustum of another cone. Visual observable measuring means on the gauges determine that each of the opposed threaded surface of the joint is of proper length and nominal diameter, and is properly positioned respective to the vanish point of the threads. In one embodiment of the invention, the gauge for measuring both the box and pin ends of a joint is made into a unitary annular member. In another embodiment of the invention, the gauge is made in two separate parts, one part for the pin end and the other part for the box end of the joint.

REFERENCES:
patent: 2339699 (1944-01-01), Husband
patent: 3829977 (1974-08-01), Lambert
patent: 4112355 (1978-09-01), Gibson et al.
patent: 4216586 (1980-08-01), Long

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