US1018910A - Temper-screw. - Google Patents

Description

J. C. KAHLB.

TEMPER SCREW.

APPLICATION FILED APR. 20, 1911.

1,018,910, 7 Patented Feb. 27, 1912.

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JAMES C. KAHLE, OF OIL CITY, PENNSYLVANIA.

TEMPER-SCREW.

Specification of Letters Patent.

Patented Feb. 27,1912.

Application filed April 20, 1911. Serial No. 622,271.

To all whom it may concern:

Be it known that I, JAMEs C. KAHLE, a citizen of the United States of America, residing at Oil City, in the county of Venango and State of Pennsylvania, have invented certain new and useful Improvements in Temper-Screws, of which the fol lowing is a specification, reference being had therein to the accompanying drawing.

This invention relates to temper screws used in connection with well drilling machinery for feeding or paying out the drilling cable during the drilling operations.

The object of my invention is to furnish a temper screw with positive and reliable means, in a manner as will be hereinafter set forth, for automatically feeding the screw, thereby relieving a well driller of the re sponsibility, obviate the exacting attention heretofore required, and preventing injury to drilling machinery by what is commonly styled pounding which causes considerable jarring detrimental to a machine or derrick.

It is the present practice for the operator of a well drilling machine to adjust the temper screw as his wisdom best dictates, it often being a matter of instinct with the experienced and guess work with the inexperienced. To successfully and expeditiously drill a well it is essential that the drilling be performed in an economical manner with the least possible wear upon the drilling tools, cables, machine and 'derrick. The well driller must use the utmost care to protect the drilling tools and cables in adjusting the feeding screw, and even when the best judgment is used, it is often necessary for the driller to leave the feed screw to devote his attention to other matters. It is during this period of absence that the most serious damage is done. As

I an example, the drilling tools may be boring through a stratum of indurate shale of an unknown depth, and it is the practice for a driller to let out the temper screw whereby the drilling can be continued during his absence. It may be immediately upon the driller departing that the tools break through the stratum and either enter a very soft-shale or a cavity. In either instance, the entire weight of the string of tools is suspended from the drilling cable, thus overloading the drilling machine and where such cavities are encountered, the drilling cable is subjected to considerable wear and often breaking against the stratum of shale.

My invention a ims to obviate the above defects by providing a feed screw that will be automatically fed, after having been once set, direct from the bottom of the well. In other words, the progress made at the bottom of the well by the drilling tools will govern the feeding of the temper screw, without any slack in the drilling cable and without undue pounding.

It is the self-feeding feature of my invention to which I attach considerable importance, and with this understanding of the broad principle of the invention, reference will now be had to the drawing, wherein there is illustrated one embodiment of the invention, but it is to be understood that the structural elements thereof are susceptible to such variations and modifications as fall within the scope of the appended claims.

In the drawing :Figure 1 is a side elevation of a temper screw provided with my improvement, Fig. 2 is an enlarged horizontal sectional view of the temper screw, and Fig. 8 is an enlarged side elevation of a portion of the same.

In order that my invention can be fully.

understood, I have illustrated a complete temper screw of a conventional form, comprising a head 1 adapted to be suspended from a walking beam, arms 2 carried by said head, jaws 3 carried by the lower ends of said arms and adapted .to engage a screw 4 and a clamp 5 carried by the lower end of the screw and adapted to hold the drilling cable during the drilling operation.

My improvement is first in connection with the screw 4, which has the under side of the threads thereof beveled at a greater inclination, as at 6 than the upper sides of the threads, the jaws 3 of the arms 2 being correspondingly beveled whereby the screw will have a tendency, due to the weight supported by the same, to descend by gravity, such movement of the screw being accomplished and given sufiicient impetus by the vibrations of the temper screw when in operation.

Secured to one of the jaws 3 by set screws 7 or other fastening means is a yoke 8 hav-- the outer end thereof provided with a split boss 9, said boss and said yoke having a longitudinal opening 10 with the walls thereof screw threaded. The other jaw 3 of the temper screw is provided with a transverse groove 11 for a block 12 arranged within the yoke 8, said block having the up per and lower edges thereof provided with outwardly extending lugs 18 holding a curved spring 14. Engaging the outer side of this spring is the inner end of a screw 15 adjustably mounted in the opening 10 and the outer end of said screw has a crank or handle 16. To fix the screw 15 relatively to the yoke 18, the locking lever or jam nut 17 is employed, which is adj ustably mounted upon the exterior tapering and screw threaded surface 18 0f the boss 9.

The resiliency of the spring 14 and the degree of tension under which it is maintained by the screw 15 determines the selffeeding or adjustment of the screw 4 be tween the jaws 3. When the screw 15 is adjusted and locked to hold the spring 14 under considerable tension, the jaw 3 engaged by the block 12 is more firmly held in engagement with the screw, consequently the screw cannot feed as rapidly as though the tension upon the spring 1a was released. It is through the medium of the screw 15 that a well driller can regulate the selffeeding of the screw, particularly when the drilling operations at the bottom of a well are understood by the driller and the nature of the strata of earth encountered.

What I claim is 1. In a temper screw, a screw having the under sides of the threads thereof beveled, jaws adapted to engage said screw, a yoke carried by one of said jaws, and a spring pressed block arranged in said yoke and adapted to engage the other of said jaws.

2. In a temper screw, a screw having the under sides of the threads thereof beveled,

and including a screw for regulating the engagement of the jaws with said screw to control the feed of the latter.

4. In a temper screw, jaws, a screw adapted to feed by gravity through said jaws, a yoke carried by one of said jaws, and an adjustable cushion means extending in one of said jaws and guided by the arms of the yoke for regulating the feeding of said screw.

5. In a temper screw, a threaded feeding element, a pair of jaws for feeding said element by gravity, means engaging one of said jaws for regulating the feed of said screw and including a block, a spring engaging said block, an adjusting means adapted to be locked in engagement with said spring, and a yoke supporting the other of said jaws and guiding said regulating means and further supporting said adjusting element.

In testimony whereof I affiX my signature in the presence of two witnesses.

JAMES C. KAHLE.

Witnesses:

DORSEY P. KAHLE, LEE A. MoCRAoKEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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