US1338455A - Gearing for use in oil-well-drilling machines - Google Patents

Description

H 1. LOCKHART GEARING FOR USE IN OIL WELL DRILLING MACHINES.

APPLIZIATION FILED MAR. 26. I919.

Patented Apr. 27, 1920.

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aflvanboz H. J LOCKHA g 5% QKM H. J. LOCKHART.

GEARING FOR USE IN OIL WELL DRILLING MACHINES.

APPLICATION FILED MAR. 26. 1919.

1 38,455, Patented Apr. 27, 1920.

2 SHEETS-SHEET 2.

/ IIIIIIII npamtoz LLJ. Locwm 'r attozn e1 HAROLD JAMES LOCKHART, 0F PARKERSBURG, WEST VIRGINIA..

GEARING FOR USE IN OIL-WELL-DRILLING MACHINES.

Specification of Letters Patent.

Patented Apr. 27, 1920.

Application filed March 26, 1919. Serial No. 285,174.

To all whom it may concern Be itknown that I, HAROLD J. LOCKHART, a citizen of the United Statesfresiding at Parkersburg, in the county of "Wood and State of Vest Virginia, have invented certain new and useful Improvements in Gearing for Use in Oil-VVell-Drilling Machines, of which the following is a specification.

My invention relates to improvements in gearing used in oil well drilling machines.

An important object of the invention is to provide means for positively connecting the calf wheel with the band wheel, to be driven thereby, and dispensing with the usual sprocket chain, sprocket wheels, and clutch, employed for this purpose, such driving connecting means also serving to permit of'a proper slippage in case of excessive strains.

A further object of the invention is to provide apparatus of the above mentioned character, which is simple in construction, inexpensive to manufacture, strong and durable.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a plan view of apparatus embodying my invention;

Fig. 2 is a side elevation of the same;

Fig. 3 is a partly diagrammatic and partly perspective view of the cable arrangement;

Fig. 4 is a detail section through the calfwheel pulley;

Fig. 5 is a similar view through the band wheel pulley, and,

Fig. 6 is a sectional view taken on line 6-6 of Fig. 2.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates a main frame as a whole, comprising longitudinal beams 6. These longitudinal beams are connected by transverse beams 7, as shown. At the forward ends of the beams 6 are upwardly projecting beams 8, to which are secured journal boxes 9, receiving a shaft 10, carrying a calf or casing line drum 11. A calf wheel 12 is rigidly securedto the drum 11, to rotate therewith, and this calf wheel has a grooved calf wheel pulley 13, arranged upon one side thereof and rigidly secured thereto. This pulley 13 is provided with three separate annular grooves 14 which are curved in cross section, as shown in Fig. 4. These grooves are separate, and are not continuous spiral grooves. The numeral 15 designates a band wheel adapted for engagement with a belt leading to a power driven pulley. This band wheel is rigidly secured to a transverse band shaft 16 journaled in bearings 17. These bearings are rigidly secured to the beams 6. A crank 18 is rigidly secured to one end of the shaft 16. This crank is adapted for connection with a walking beam (not shown), which is connected with the tool cable or line to reciprocate the same, as is well known. A pulley 19 is rigidly secured to the shaft 16, and this pulley is provided with three separate annular grooves 20, which are not one continuous spiral groove. These grooves are curved in cross section, as shown in Fig. 5, and are in alinement with the grooves 14 of the pulley 13.

The numeral 21 designates a flexible element, such as a metallic cable, rope or the like. This flexible element is continuous and is in the form of an endless belt. The flexible element 21 is placed within the outer groove 14 of the pulley 13, at its lower side, and then placed in engagement with grooved pulleys 22 and 23, included in a tightener or slack take-up device. This device is laterally inclined and the flexible element is next passed through the inner groove 20 of the pulley 19. The flexible element then extends above the pulley 19 and is passed into the inner groove 14 of the pulley 13, in alinement therewith. The flexible. element is then passed beneath the pulley 13 and beneath the pulley 19 into the second or inner groove thereof and then over the pulley 19 within the second groove and over and about the pulley 13 in the second groove. The flexible element then extends beneath the pulley 13 in the second groove and is carried into the outer groove 20 of the pulley 19 beneath it and upwardly over the pulley 19 into the outer groove 1 1, of the pulley 13. The cable then continues about the pulley 13 and passes from this outer groove to the slack take-up device as above stated. This arrangement of the flexible element 21 is important, as it prevents the same being unduly worn in use.

The pulleys 22 and 23 of the tightener, are pivoted within a swinging support 2%,

pivoted between its ends to a support 25, as shown at 26. The swinging support is adapted to be turned upon its pivot by an upwardly extending lever 27, rigidly secured thereto, and having connection with a rearwardly extending link 28, pivoted to a crank 29. This crank is carried by a rock shaft 30, turned by a lever 31. The lever 31 is provided with a forked element 32 at the end thereof, and this forked element is adapted to engage with the links of an anchor chain 33, whereby the lever 31' may be held in adjustment in the desired angu: lar position The operation of the apparatus is as follows:

lVhen'the lever 31 is held in the rear position, whereby the tightener holds the flexible element 21 suitably taut, the rotation of the band wheel 15 is transmitted to the calf wheel 12, in a positive manner, without slippage, to enable the cable carried by the calf drum 11 to raise or handle the casing under normalcon ditions. The elimination of slip page is due to the peculiar construction of the grooved pulleys, and the arrangement of the flexible element or cable. I have found that this arrangement provides as positive a connection between the two pulleys, as if a sprocket chain and wheel drive were provided. When it is desired to stop the rota-- tion of the calf drum 11, the lever 31 is swung upwardly, and the tightener device renders the flexible element 21 suitably slack whereby the pulley 19 will slip in contact with the flexible element. It is thus seen that the driving means will embody the ad vantages of a'positive drive with the usual clutch. This driving means possesses a further advantage not adherent in the sprocket wheel, sprocket chain, and clutch drive, as such a drive is absolutely positive and the calf wheel cannot stop unless the clutch is opened. As a result of this, when the easing sticks, due to concaving in of the well, the calf wheel will frequently pull the casing with such force that its sections are separated. By employment of my driving connecting means, when the casing sticks,

the flexible element will permit of slippage I- aving thus described my invention,

what I claim is:

In an oil well drilling machine, a band wheel, a calf wheel, a pulley connected with the band wheel to rotate therewith and having a plurality of separate'annular' grooves, a second pulley connected with the calf wheel for rotation therewith and having a corresponding number of separate annular grooves which are arranged in substantial alinement with the first-named annular grooves, a. pivoted support arranged between the pulleys and laterally inclined, tightener pulleys carried by. the support, means to angularly adjust the pivoted support, and an endless cable embodying a plurality of upper and lower runs, the cable engaging within the two sets ofannular grooves and having the top runs parallel, said cable having one of its lower runs passed about the tightener pulleys carried by the pivotedsupport, the said lower run passing from the outer groove of one pulley and leading to the inner groove of the other pulley, the lower run engaging within the intermediate groove of the band wheel pulley extending to'the inner groove of the calf wheel pulley, and the lower run engaging within the outer groove of the band wheel pulley extending to the intermediategroove of the calf wheel pulley.

In testimony whereof I afiix mysignature in presence of two witnesses.

, HAROLD JAMES LOOKHART. Witnesses i L.'D. DUNSMORE, D. M. Lone.

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