US1742486A - Pump jack - Google Patents

Description

Jan. 7, 1930; s. B. SARGENT PUMP JACK Filed Jan. 14, 1925 5 Sheets-Sheet ATV-021M? Jan. 7, 1930. s. B. SARGENT PUMP J ACK 3 Sheets-Sheet 2 Filed Jan. 14, 1925 ill , MN "1 w" mm r iiiiiiiiiiifi Arroezvsr Jan.

S. B. SARGENT PUMP JACK Filed Jan. 14, 1925 3 Sheets-Sheet 3 un/v62 0i 6,92 ,90-

yw/zwk Patented Jan. 7, 1930 UNITED STATES PATENT OFFICE SUMNER B. SARGENT, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO SARGENT .ENGI- NEERING CORPORATION, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALI- FORNIA PUMP JACK Application filed January 14, 1925. Serial No. 2,391.

My present invention is a jack; and it is an especial object of this invention to provide advantageous cam means for imparting reciprocatory movements to a pump rod, a drill cable, or the like, extending into a well; and a preferred embodiment of my invention may comprise cam means for varying. the length of stroke, as well as means for predetcrmining rates of reciprocation and dura- 1* tion of dwells.

It is an object of this invention to provide, for the purpose referred to, or for similar purposes, simple and rugged cam means for converting substantially uniform rotary motion into a non-uniform reciprocatory motion; and my preferred means for effecting this conversion may comprise arota'ting cam of unusual design. This cam may include a disc-like body rotatable in a Vertical plane and provided with a laterally projecting cam web in which gates are provided, this cam being preferably so designed as to effect a single reciprocation of a lever, or the like, during two revolutions of the shaft by which said cam is rotated; and the face of the men tioned cam may be so designed that one of the movements of the mentioned lever, such as the movement whereby a drill or a pump plunger is lifted, may be distributed and con tinned through a longer period of time than the opposite or descending stroke thereof. For example, the mentioned cam may be so constructed that the lifting stroke upon a cable. assuming such cam to berotated at a uniform speethinay consume approximately three-fourths of the time required for two revolutions of said shaft; and said lever, or transmitting means interposed between said lever and a reciprocated rod or cable, or both said lever and said transmitting means, may be such. as to permit of a wide of adjustments, to vary the length of the stroke imparted thereby or the distances between reciprocated parts. 7

Other objects of my invention will appear from the following description of a preferred embodiment thereof, taken in connection with the appended claims and the accompanying drawings, in which Fi nl is a side elevation of a iLCli'lllLlSilillL- ing my invention as applied to the rocking of a walking beam, the latter being of the type currentl used in the drilling and pumping of oil we ls, or the like, and parts thereofbeing broken away.

Fig. 2 is a separate elevational'view show; ing details of a preferred type of cam comprising gates and operating means therefor.

Fig. 3 is a sectional View, taken substan tially as indicated by the line 3-3 of Fig. 2.

Fig. 4 is a detail view, taken fromthe' direction of the arrow 4 of Fig. 2, and still further enlarged. T

Fig. 5 is a side elevational View of an embodiment of my. invention in which a cable or a sucker rod, or the like, is vertically suspended from a cross head in such mannor that no walking beam is required.

Figs. 6 and 7 are respectively detail views taken as indicated by the arrows 6 and 7,-respectively, of Fig. 5. 4

Fig. 8 is a separate view of a wrist pin adapted to be used, upon occasion, in a man ner hereinafter described.

Referring to the details of that-specific embodiment of my invention illustrated in Figs. 1 to 4 inclusive, 11 may be a walking beam to which a rocking motion is imparted by means comprising a link 12 and a lever 13, this lever being shown. as provided with an arm or thrust member 14, carrying a roller 15, constantly engaged by a cam 16, the latter being shown as keyed to a constantly rotating shaft 17, constituting a source of power.

Although I might impart movement to the lever 13, or its equivalent by a cam of different form, the mentioned cam 16 may comprise a disc-like body element 18-from which a cam element or web 19 laterally projects. The cam web 19 may he in the form of a closed spiral comprising an inner cam section 19 and an outer section 19 and in the form illustrated this cam web is of such form as to exert at all points outward pressure upon rollers 15, and to require two complete revolutions of the shaft 17 to effect a single reciprocation of the lever 13., or its equivalent. For example,- the depression of the lever 13 may be continued throughout the movement of the cam 16 from the position in which it is shown in Fig. 1, assuming the said cam to rotate in the direction of the arrow 20, throughout practically a revolution and a half, or until the proud port-ion 21 of the cam web 19 shall contact with the roller 15; and the upward movement of the lever 13, or its equivalent, may then continue through substantially a half revolution of said cam. To permit a spiral web constituting two branches as described constantlyto engage roller 15, or its equivalent, it will be obvious that the said roller must be laterally offset relatively to its supporting arm 14; and a pair of gates 22, 23 are also provided in said cam web, these gates being shown as interconnected by a lever 24, pivoted at 25 and extending between links 26 and 27. By the described connections, the gate 22 being pivoted at 28 and the gate 23 being pivoted at 29, the closing of either gate, as by engagement with the roller 15, may be effective to open the other gate; and resilient means such as a compression spring 30, shown as surrounding a sliding rod 31 (and interposed between a fixed stop 32, through which the rod 31 slides, and an adjustable nut 33) may be employed to snap and hold the mentioned gates in either of two adjusted positions. My sug gested construction for this purpose comprises a link 34, extending through an aperture 35 in the disc 18, and a link 36, pivoted at one end to the link 34 and adapted to swing on a fixed pivot 37, the alternative positions of this link, and the consequent positions of gates 22 and 23 being best illustrated in Fig. 2. It will be obvious that, assuming the cam 16 tobe rotated in the direction indicated, the roller 15, or its equivalent, after contacting with the exterior of the gate 22, and thereby opening the gate 23, and after passing through the latter gate to such a position as that in which it is shown in Fig. 1, may next contact with the interior of the gate 22, thereby opening the same and closing the gate 23 in time to advance thereover. In its region of greatest radius, my cam may also be pro vided with a dwell of any desired length, in order that a lifting stroke imparted to pump plungers,'or the like, may be fully effective in the delivery of oil, or the like, before an opposite movement starts.

Ihave shown the lever 13, to which motion is imparted by means of the cam 16, or its equivalent, as comprising a channel bar to which the arm 14, carrying the roller 15, is secured, this channel bar being supported through a fixed pivot 38; and I have shown said lever 13 as carrying at its outer end an adjustable pivot 39, the fixed pivot 38 being above the mentioned channel bar, and the adjustable pivot 39 being below the same and movable by a threaded engagement between a casting or block 40, carrying said pivot shaft 39, and a rotatable threaded rod or shaft 41, shown as extending between brackets 42- and 43, secured to said lever. By the means described, it will be evident that the effective length of the lever 13 may be varied within wide limits.

To contribute to the rigid support of the arm 14, or its equivalent, I may optionally provide means such as a tension element 44, shown as secured at its inner end 45 near the fixed end of the lever 13 and as provided at the outer end with a nut 46, engaging the arm 14, through which it may extend; but any equivalent construction may be employed inexpensively to provide a rigid support for the arm 14, whether or not this arm is cast integral with the said lever.

In conjunction with'the elements already described, or their equivalents, I may employ any preferred means for transmitting motion to a vertically reciprocable rod or cable; and, when such transmission is effected by means of the walking beam 11 and the link 12, I may employ additional adjusting means of any preferred character, the means disclosed forthis purpose in Fig. 1 comprising threaded connections between an intermediate rod section 47 of the link 12 and the terminal sections 48, 49 thereof, nuts 50, 51 being confined between projections 52, 52', between which the mentioned threaded ends of the rod 47 extend, in such manner that the rotation of either of these nuts is effective to vary the length of the link 12. The lower end section 48 being pivoted at 39, the upper end section '49 of the link 12 may also be secured to a movable pivot, as to the pivot 53, shown as adjustable longitudinally of the walking beam 11 by the rotation of a screw 54,1nounted thereon and extending parallel therewith. T he pivot 53may be secured in a sliding block 55, shown as provided with a guide or guides 56, and a rod or cable extending into a well may be secured to the opposite end of the walking beam 11, or its equivalent, in any usual or preferred way. r

In the form of my invention illustrated in Figs. 5,6 and 7, instead of employing a walking beam, I show the pivot 53 as carried by a sliding cross head movable between vertical guides 58, which may be supported in any suitable way, as by means of braces 59. These may extend to the floor 60 of a derrick, or to the frame thereof (not shown) and any usual or preferred means, such as a stirrup 61, extending about a block 62 upon the pivot shaft 53, may be employed for the connecting of a'rod or'cable 63, extending into a well, therewith, any usual or preferred connecting' and adjusting means being interposed, as'at 64. In this form of my invention, it will be obvious that the links 12' serve as compression elements, rather thanas ten sion elements; and I may accordingly not only increase the diameter thereof, but provide'a plurality of the same, connecting them with the pivot shafts 39 and 53 in some such manner as is suggested in Figs. 5,- 6 and 7, the pivot 39" being inv this case adjustable by means such as acentral screw etl extending through a block 40 disposed between a pair of oppositely disposed channel bars constituting the lever 13 and carrying between them a lifting arm 14:, equivalent to thearm 14 of the construction previously described but extending above the cam 16. 1

By a general organization of the character described, it will be obvious that I provide cam means for converting the rotary motion of the shaft 17, or its equivalent, into a vertical or substantially vertical reciprocatory movement, and my described cam means not only serves to effect a single reciprocation of a rod or cable during two revolutions of the shaft 17, but it also permits an advantageous ratio between the lifting stroke and the return stroke of such a rod or cable; and it enables the lifting effort to be distributed in a favorable manner. It also facilitates adjustments of the length of said strokes and the relative positions of parts, within very wide ranges.

As shown, the roller 15, or its equivalent, is preferably placed in advance of an arc centering at 38 and drawn through the axis of the shaft 17,the word advance being used with reference to the direction of rotation of the shaft 17; and although I have described a cam in which a cycle is completed during two revolutions, it will be understood that the same principles of construction may be employed in the production of a cam requiring another number of revolutions to complete a cycle and a return of parts to a starting position; and also that the length of the mentioned dwell, as well as the rates of increase and decrease in the lengths of radii, and the absolute dimensions of my described cam, may be varied within comparatively wide limits.

Although I have herein described alterna tive embodiments of my invention, I am aware that parts thereof might be independently used, and that various changes and modifications may be made by those skilled in the art to which this case relates, without the slightest departurefrom the spirit and scope of my invention, as the same'is indicated above and in the following claims. For example, although my described cam and lever organization-is designed to produce strokes differing in character, in length and in frequency from those obtained by the use of the crank of'an ordinary standard rig employing a band wheel the described cam 18, or its equivalent, whose shaft 17 may be driven by the mentioned usual band Wheel, may be adapted to serve also the functions of the usualcrank which it replaces. By providing a series of holes 65, each shown as reinforced by a boss 66, these holes being arranged either on the same radius or on different radii, I mayprovide meansfor the attachment of a specialvwrist pin 67, wlios'e innerend 68 is adapted to fit within anyof the holes and is shown as threaded and provided with nuts 69 for its secure retenf tion; and theouter end 70 of this Wrist pin, projecting laterally beyond the cam Web '19, may be adapted to give any desired throw to a special or usual pitman (not shown, being ordinarily laid aside) pivotedto a block 57 or to a walking beam'll in a usual manner or by adjustable means of the general character described. During disuse of the pitman, the pin 67 may ordinarilyjbelaid aside therewith. I I

I claim as my invention: v y v q 1, A pump jack construction embodying: a thrust member; a roller on said thrust memher; and a rotatable cam member adapted to engage said roller and to impart movement to said thrust member, said cam member comprising a rotating body element having two cam elementsthereon, one of said cam elements being circumscribed by the other; oppositely disposed gate members adapted to admit the passage of said roller from one of said cam elements to the other of said elements and mechanical meansinterposed between said gate members adapted to co-operatively efi'ect opposite movement of said gates.

2. A pump jackconstruction embodying: a thrust member; a rolleron said thrust member; and a rotatable cammember adapted to engage said roller andtoimpart'movement v to saidthrust member, said cam membercomprising a rotating body element having two cam elementsthereon, one of said cam elements being circumscribedbythe other; oppositely disposed gate members in the outer cam element adapted to admit the passageof said roller from one of saidelements to the other, said gate" members being operable by engagement with said roller and lever means connecting saidgate members adapted to open one gate when the other is closed 3. A pump jack construction embodying: a thrust member; a roller on said thrustmember; and a rotatable cam member adapt.- ed to engage said roller and to impart move- .ment to said thrust member, said" cam member comprising a rotating body element having two cam elements thereon, oneof said cam elements being circumscribed by v the other, oppositely disposedgate membersin the outer cam element adapted to admit the i2!) passage of said roller from one of said ele: ments to the other, said gate members being operable by engagement with said roller; lever means connecting-said gate members adapted to open one gate when'the'other is 12$ closed; and means for ,releasably retaining said lever members in eitherof two adjusted positions; 7 y i ,ALA cam for use in, combination with a pump j ck embodying za drive shaf t,; a blody element 'on said drive shaft, having a cam web projecting laterally therefrom, the radial distance between said web and'thedrive shaft through said body element being increased throughout somewhat less than one and onehalfrevolutions, said web. returning to its starting level in substantially one-half revolution, forming an inner cam element and an outer cam element; and oppositely disposed interconnected gate members pivotally mounted in said outer cam element and adapted to provide uninterrupted connecting surfaces between said inner cam element and said outer cam element.

5. A cam for use in combination with a pump jack embodying: a body element having a cam web projecting laterally therefrom, the radial distance between said Web and a drive shaft through said body element being increased throughout more than a complete revolution, said web returning to its starting level in substantially one-half revolution, forming an inner cam element and an outer cam element; oppositely disposed interconnected gate members pivotally mounted in said outer cam element and adapted to pro vide uninterrupted connecting surfaces between said inner cam element and said'outer cam element; and means for releasably holding said gate members in open and closed positions.

6. A jack suitable for use in the pumping of deep wells or the like, embodying: a drive shaft, a cam member mounted on said drive shaft, comprising a body element and aweb cam projecting laterally therefrom as a partial spiral, increasing in radial distance from said drive shaft throughout more than a complete revolution, said cam web returning to its starting lever in less than a complete revolution forming an inner cam element and an outer cam element, said elements crossing each other at a common point; gate members pivotally mounted in' said outer cam element opposite said common point, and adapted'to form uninterrupted paths between said cam elements; and spring and lever means for yieldably holding said gate members in either of the two adjusted positions.

7. Ajack suitable for use in the pumping ofdeep wells or the like embodying: a drive shaft; a cam member on'said drive shaft comprising body element having a web cam projectin laterally therefrom as a part al spiral, increasing in radial distance from a centralshaft throughout more than a com plete revolution, forming an inner cam element and an outer cam element, having a common pointin their outer surfaces, said outer cam element being provided with openings on opposite sides of the said common point; and interconnected pivoted gates mounted over said openings and yieldably held in either of the two adjusted positions by means comprising links and a spring, one

pumping of deep wells or the like embodying:

a thrust member; a roller on said thrust member; and a cam comprising a rotating element having a web cam formed thereon, said web cam comprising two substantially closed elements, one circumscribed by the other and both engageable by said roller; the outer of said elements being provided withgates to permit the passage of said roller between the inner and outer elements of said cam; and said roller being held in contact with said cam by a constant radial pressure from said thrust member.

9. In an organization of the character described a lever system; cam means; and a roller mounted on said lever system in engagement with said cam; said cam means being adapted to effect one reciprocation of said lever system to a plurality of rotations of said cam and comprising an inner and an outer cam web having a common point, the outer web being provided with gates which are alternately opened and closed by said roller, for admitting the alternate passage of said roller from one of sa1d webs to another of said webs.

10. In an organization of the character de- 5 scribed, a lever system; cam means; and a roller mounted on said lever system in engagement withsaid cam; said cam means being adapted to effect one reciprocation of said lever system to a plurality of rotations of said cam and comprising an inner and an outer cam web having a common point, the outer web being provided with gates which are alternately opened and closed'by said roller, for admitting the alternate passage of said roller from one of said webs to another of said webs, said gates being provided with interconnecting links, adapted to close one of said gates when the other is opened.

11. A cam comprising: a disc adapted to be rotated on an axis substantially at right angles thereto a cam web projecting laterally from said disc consisting of an inner cam web member and an outer cam web member tangent one with the other; said outer cam Web being provided with a pair of separately pivoted gates oppositely mounted at the point of tangency between said inner cam web and said outer cam web; said gates being provided with interconnecting means whereby the opening of one gate is effective to close the other.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 5th day of January, 1925. I

, SUMNER B. SARGENT.

8. A pump jack, suitable for use in the lio

Images