US1314960A - Well-boring apparatus - Google Patents

Description

J. 0. HEADRICK AND 1. M. WINFREY.

WELL BORING APPARATUS.

APPLICATION FILED IuNE 20,1918.

Patented Sept. 2, 1919.

LLS14,960.

INVENTORS 7 VTTORNEYS To all whom it may concern.'

UNTTED sTATEs PATENT oEEIoE.

JAMES 0. HEADRICK AND JOHN M. WINFREY, OF HUMBLE, TEXAS.

Wl'fLL-BORIN G APPARATUS.

l Specification of Letters Patent.

Patented Sept. 2, 1919.

Be it known that we, JAMES O. HEADRICK and J oHN M. VVINFREY, citizens of the United States, residing at Humble, in the county of Harris and State of Texas, have invented certain new and useful Improvements in Well-Boring Apparatus, of which the following isa specification..

This invention relates to new and useful improvements in a well boring apparatus.

The object of the invention is to provide a a device of the character described, through which a drill stem may be rotated, in drilling a well, 'and by means of which said stem may be held elevated, when it is desired to unscrew the joints thereof, in order to withdraw the stem from the bore'.

In drilling by the rotary process, a 'drill stem is employed, which is formed of sections, united by means of couplings.

To the lower end of this stem the drill bit is attached, and in drilling, the stem is rotated by any well known form of rotary.

When it is desired to withdraw the stem from the bore, the sections of the stem must be separated, for convenience in handling, and in accomplishin this work, the stem is elevated and held 1n elevated position while the sections above the rotary are being unscrewed. When these sections are u-nscrewed, and disposed of, the pipe is again elevated, and the upper sections again unscrewed and so on until the stem is entirelyv withdrawn.

It is the object of this invention to provide an apparatus through which the stem ma be rotated in drilling, and by means of whlch said stem may be held in elevated position, while being separated into sections and disposed of,as hereinbefore explained.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, operation and arrangement of parts, an example of which is given in thisspecification and illustrated in the accompanying drawings wherein Fi re 1, is a plan view of the apparatus shtwlng the pipe gripping device removed, an i Fig. 2, is a side elevation thereof, shown partially in section.

Referrlng now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1, refers to a supporting framework, whereon the base plate 2 is mounted, said plate having a central opening 3, and surrounding said openin is an` annular upstanding flange 4. ounted upon the base plate and surrounding said flange is the rotary table 5, and interposed between said plate and table are the antifriction rollers 6 upon which the table operates. Said table is secured in position by means of a ring-like nut 7, which is thread ed into the upper end of the flange 4, and seats in a counter-sunk groove 8, in thetable. The underside of the table is formed into a beveled gear face 9, which is in mesh -wth the pinion 10, fixed upon the inner end of the drive shaft 11. Mounted upon the rotary table is a pipe gripping device as 12, of any desired form, which grips and rotates the stem 13, in drilling. The inner wall of the annular flange 4 is provided with a plurality of vertically extending recesses 14, in which the respective dogs 15 are pivoted, at their lower ends. These dogs are yheld withdrawn into their respective recesses during drilling operations, by means of thel annular sleeve 16, which fits up into the central opening 3, of the base plate. This sleeve is held in position by means of a plurality of set bolts as 17, which extend through vertically extending slots 18, in the sleeve, and are anchored to the base plate. These slots permit a limited vertical movement of the sleeve 16 relative to the base plate. The numeral 19 refers to a transverse shaft, which is rotatably mounted 1n suitable bearings, and extendlng therefrom are the rigid arms 20, which areY spaced apart, and whose free ends are turned 1nwardl'y, and engage under the sleeve 16.

One end of this shaft is turned u ward forming the lever 21, and a link 22, 1s provthe mechanism just described to elevate the free end of the arm 20, which in turn elevates the sleeve 16, and the upper end thereof, Contacts against the dogs 1,5, to forcev them back into the recesses 14;, Where they are held during drilling operations. When it is desired to Withdraw the stem, the pedal 25, is released, permitting the sleeve to descend, which in turn, permits the dogs to drop inwardly against the stem 13. The upper ends ot' these dogs have jaws, as 26, secured thereto, Whose inner faces serrated, and engage against the stem. lhen it is desired to Withdraw the stem it is pulled upwardly a distance so as to bring the upper sections thereof above the rotary, Where they may be unscrewed. When the pipe is released, the dogs immediately engage therewith, and hold it in elevated position, so that the upper sections may be unscrewed and disposed thereof. The stem is then again pulled upwardly, so as to bring the other device to an accessible position and thereupon the dogs will again immediately grip the stem and prevent it from descending, while the exposed sections are being disosed of and so on until the entire stem is Withdrawn.

renee@ What We claim is I l l. In a device of the character descrihed, a base 'plate having an opening therethrough, to admit a/'drill stern, pipe engaging means anchored "'/to said base plate and provided to engage with a stem and hold the same elevated, and a sleeve arranged in the base plate opening and provided to engage With and hold said means Withdrawn from the stem.

2. The combination with a suitable base, having a central opening, of a plurality of dogs pivotally secured to the base, a sleeve, litted within said opening and means for actuating the sleeve against said dogs toE hold them apart,

-ln testimony whereof We have signed our` naines to this specification in thepresence of two' subscribing Witnesses.

JAMES 0. HEADRICK. JOHN M. WNFREY.

Vitnesses:

E, V.. HARDWAY, kann BRUNs.

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