G - Physics – 01 – B
Patent
G - Physics
01
B
33/145
G01B 3/40 (2006.01) G01B 3/14 (2006.01)
Patent
CA 1195492
GAUGE FOR TAPERED THREADED BOX AND PIN ENDS OF A JOINT ABSTRACT OF THE INVENTION 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 mem- ber 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 in- vention, and has an external tapered surface formed between spaced shoulders which defines a frustum of another cone, Visual observ- able 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. -1-
410597
Borden Ladner Gervais Llp
Roberts Royce G.
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