Forgie v. Oil-Well Supply Co.

58 F. 871, 7 C.C.A. 551, 1893 U.S. App. LEXIS 2315
Court of Appeals for the Third Circuit·Decided November 21, 1893·No. No. 24·Published·Cited by 11 cases

Opinion

GREEN, District Judge.

The bill of complaint in this case was filed to restrain the appellee, the defendant below, from" infringing certain letters patent numbered 422,879, granted to the appellant on the 4th day of March, 1890, for certain new and useful improvements in wrenches for oil-well tools. In the specification of the; letters patent, it was stated that the invention related to an automatic wrench for coupling and uncoupling the sections of a drill rod for a well boring or drilling apparatus. The coupling for which, the invention was especially adapted for use consisted of a tapering or conical screw, the sockets of which were fitted tightly and securely together. -

The drilling of oil wells, especially in the state of Pennsylvania, has become an art, well defined, and perhaps unique. Originally, oil wells were drilled only two or three hundred feet deep; but, since the flow of oil has lessened from these comparatively shallow reservoirs, wells are now more commonly sunk to a much greater depth, — in not a few instances, to the depth of three thousand feet; and, as the depth has increased, so has it been found necessary to increase the diameter of the well. The earlier wells were not more than 4 inches in diameter. Now, they are scarcely less than 12 to 16 or 18 inches. It followed, of course, that in the drilling of these larger and deeper wells the tools commonly used would nec[872] essarily have to be much increased in size, successfully to perform the excavation. The apparatus used in dialling these wells is composed of what may be termed a string of tools, or heavy iron or steel rods, having a sharpened end, operated by steam power. This string of tools is lifted to a sufficient height, by the action of the steam, directly over the excavation. When at its maximum height, it is dropped suddenly into the well, and the drilling is accomplished by the repeated pounding of the tools upon the bottom of the excavation. A ’string of tools weighs generally from two to three thousand pounds, and it is readily seen, with the momentum acquired in their fall, its operation is simply tremendous. Now, usually, the larger part of the excavation is drilled through solid rock, and hence the concussion of the tools with the rock not only rapidly dulls the lower or sharpened tool in the string, but, as well, causes dust to arise, which, entering the joints, makes it almost impossible to unscrew them. The lower part of the string of tools is technically called the “bit,” and this is fastened by a screw joint ' to the tool next above it. At very short intervals, it becomes necessary, from the dulling effect of the concussion upon the bit, to '/draw the tools from the well, and remove the lower section, for the ¡purpose of sharpening. This was always an exceedingly difficult ¡operation. As stated, not only did the concussion dull the end 'of the bit, and cause dust and little particles of rock to fill the ¡threads of the screw by which it was attached to the next tool ¡above it, but, as well, the threads of the screw subjected to so great 'a blow would be battered and distorted by the concussion with the 'solid rock. The manner in which, in the earlier days of oil wells, The bit was originally unscrewed from the tool immediately above it was this: An arc-shaped tra'ck, about half an inch thick, called in the evidence a “circle plate,” was secured to the floor of the derrick, and connected with the well. In the plate, two parallel lines of holes were made, nearly from end to end. At one end of this circle plate was rigidly secured a stout post, against which rested the end of a stationary wrench bar. The other end of this wrench bar was hook-shaped, to grasp the lower section of the drill rod. This was really, in effect, only a powerful hand, to hold stationary the lower - section while the. upper section was rotated. The upper section of the drill rod was gripped by the end of a similar wrench bar, called the “moving wrench bar.” The other end of this wrench bar projected out over the circle plate. A pinch bar, or, practically, a crowbar, with the end slightly bent, and of suitable size at the lower end to enter the holes in the circle plate, was thrust in one of the holes. Two men, facing each other, grasped this pinch bar, and — one pushing and the other- pulling— used it .as a lever against the moving wrench bar. By this means, the moving wrench bar and the drill rod were swung through a short arc, about equal to the distance from one hole to another on the circle plate. • The pinch bar then, of course, lost its bearing, in the first hole of the circle plate, and was removed to the next hole in advance; and so, by this crude, tiresome, and repeated application of force to the bar, the sections of the drill rod were at last uncoupled. [873] So difficult was the operation ¡hat it often required the united power of many men to accomplish it successfully.

Mr. Forgie, the appellant, was an oil-well driller, and in 188B was in charge of a gang of men drilling oil wells in western Pennsylvania. As such operator, lie was constantly meeting with this great difficulty caused by the want of effective means to couple and uncouple the various parts of strings of tools, and that difficulty evidently caused him to consider whether, in some way or other, the power generated or transmitted by a machine could not be utilized to overcome it. The evidence does not disclose how he came to consider whether the machine or tool generally known as a "lifting jack” could be so utilized, but. it is apparent from what he did that such an idea was in his mind.

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Forgie v. Oil-Well Supply Co., 58 F. 871, 7 C.C.A. 551, 1893 U.S. App. LEXIS 2315 (3d Cir. 1893).

58 F. 871 (Forgie v. Oil-Well Supply Co.) — published by Counsel Stack Legal Research, free access to 12M+ legal documents.

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