US2599869A - Polish rod hanger - Google Patents

Description

June 10, 1952 c. w. SHELTON POLISH ROD HANGER 2 SHEETSSHEET 1 Filed Oct. 17, 1950 INVENTOR CALVIN WILLIAM SHELTON BY adw'hfiflf ATTORNEY June 10, 1952 c. w. SHELTON POLISH ROD HANGER Filed Oct. 17, 1950 2 SHEETSSHEET 2 INVENTOR CALVIN WILLIAM SHELTON ATTORNEY Patented June 10, 1952 rdmsir if: v v

o iwm w. sheuon mr er, Tex.,;'assignor mg; Huber, Gurnoratiom, Locust -N. J., a-corporatiomof New Jersey,

by ruet; lirtyice -anenoweo aig topreye ingv'ipawitor theiratoi iet tfirntafiiis" cure ct'to the zhairgervx sumstructurencs' arflt'i Limits." the permissible ".vertical movement i :the' hanger; relative to?" thtapolish .f'od; .frequeiitly to such I an; extent-that the desiredflpurpos'i is a'riot ompletely 1-aocomp1ished;=:aszwhen:Vthe motioniof therociis stopped'nearathe top .05 its Stroke; ..A1s'o*, in; slun -structure; the; arotgtmg: mechanism con-i tinpes' topperata-even -;whemthe idownwara;mo; .tion', of the'1-po1ish- .rod;1ss obstriicted-sandzthearoni is held 1 against rotation; thereby"p1acingi:.unnye-1 sired torsional stressesiomtheafioda .Earthcammoret hangers, containing i'siip .mean'sg will slide? down the polish red when theardbwnwarrimdtiomofa the rod prevented; but; willziagain-rgriptheazbd immediately at; the" starfl of: thezoupward moticn of the hangeratidihence 21,1149} v positiontbeiowrthaia normally: desired; wherebyconiimuew.openationwfi the hanger-'- wiilzitzpermifi downwardlmotibnaotithe polish rod only to ithe 'pos-itioniiwhervtheeob structiom originally occurred; even: thoughvsneh obs'tructior'rhas; beeni removemmm :wiiitraisaithei: fiolish rdd to afi-imdesir'ably elevatedaposifionr If; is an obi'ect oi my" imFentiDfitdl pmyldezmw new and improved? p'oiisin rottihanig'ertandirotatora Another obi'ciifii's tcfi provide:w'pollsmrodihangent and rotamr wfiereifi the turntableaandh pawl are enclosed in ahcasin g whicltprotectsthem from being rendered moperative bymust;cdintgice and snow and: which: holds ai-iody oflzlubricant maintain: the: rotating mechanismiiubn'c'atem further dbli 'ift is"- to provide mpoi'ish: and :rotator which s'lidablyi'mxififitedfiionxthe polish rod so that it can move aownwamreaame 1y to the I'Odxtd necSsar-y extefitwifict will fiot alfi'e i :the 1 161 l ififififiting'f' p'tiSTtiOfl of! 5th??? polish rod another otijectzie' pivfdifi polishrod: hangar amt whim downward relativw to mid and which: is constructed-:thezt thwotatm g mecmnism in- "dfEsW-iflOfiifiibN fdtfitflie-Jfidi ge m sa-move tm firmer I id zi fidlish rw nafigeranxrme tater lie-above -cmatrattle: w 1 1; re srmme and c 'dfidniiralt'ifi tf'sifi ail'tl ifi wfiifi tfi wts 6 so constructed and arranged ttrat readily removeai fmm the wish ro'd ior reisair, re lacement al-id'fihelike l bjii provide a new article of mammetuream wm- Vance" the-. sart. Still otlier obieotsfcviilll fllnfi a hereinafter.

The above and; otherrobjectsi may homecomplished in accordancewithzmy i'infienflonu which compriseszzavpoiish' rbdfianger andi'rotator hat is adaptedzito support-a; abiisl i rodizandi :t'dx part 7 firmly securing the rotatable plate to the ratchet turntable for rotation therewith, and a clamp firmly secured to the polish rod above the rotatable plate and normally supported by and only frictionally engaging the upper surface of the rotatable plate. Preferably, the annular casing is closed so as to holda body of lubricant and to prevent the entrance of Water, dirt, ice and snow and which casing completely encloses the ratchet turntable and actuating pawl so as to protect them from dirt, water, ice and snow and maintains the ratchet turntable and the pawl continuously lubricated.

Preferably, the casing comprises an inner cy lindrical side wall having an internal diameter slightly larger than the diameter of the polish rod so that it may slide freely overthe polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall so as to provide an annular space for the ratchet turntable, an

annular bottom wall at the lower end of the side walls completely closing the lowerend of the annular space between the side walls and rotatably supporting the ratchet turntable so as to provide an annular receptacle which will hold a lubricant for lubricating the ratchet turntable, and

an annular cover plate rotatably mounted over as to prevent. dirt, water, snow and ice fromen tering the casing, the cover plate being secured to. the ratchet turntable by means positioned between the side walls of the casing so that the cover plate will rotate with the turntable. Preferably, the lower surface of. the. cover plate is recessed toreceive the upper ends of the side walls so as to more certainly prevent the entrance of dirt, water, ice and snow into the casing. Also preferably, the annular casing is, not secured to the hanger bar, but normally merely rests upon and only frictionally engagesthe hanger bar so that it can be removed from the polish rod independentl'yrof the hanger bar for cleaning, repairing or replacement.

. My invention will be more readily understood from. the detailed description hereinafter given, when taken with the accompanying drawings which illustrate preferred embodiments; of the structure of my invention and in which Figure, 1 is a somewhat diagrammatic illustration, withparts in section, illustrating a convene tlonal assembly of oil well pump equipment with which-my invention is adapted'to be employed; Y Figure 2 is an'enlarged view showing the general relation of the hanger bar, casing, and clamp of my invention; r Figure 3 is a detailed view, partly in section, illustrating one form of polish rod hanger and rotator of myinvention;

Figure 4 is a vertical sectional view taken on line 4-4 of Figure 3;

Figure5 is a horizontal cross sectional View taken'on line 5-5 of Figure 3;

' Figure 6 is'a view similar to Figure 3, showing a modified form. of construction of the cover plate. 7 V

7 Referring first to Figures 1 and 2, the numeral lfl indicates a Samson post supporting a pump jack beam [2. The beam [2 is operated by a pitman rod 14 which is connected with the driving disc I6 of the pump unit 3. .A cable is supported on the outer end of the beam I2 and is connected with and carries the polish rod hanger bar 22. The hanger bar, through mechanism to be described, carries and reciprocates polish rod bar 22 is slidably mounted on the polish rod 24.

In other words, the bore in the hanger bar, through which the polish rod passes, is slightly larger than the diameter of the polish rod so that the hanger bar fits loosely over the polish rod and the hanger bar can freely slide downward relative to the polish rod whenever for any reason the polish rod is prevented from moving downward.

Referring more particularly to Figures 3 to 5, a substantially annular casing, indicated generally by the numeral 32, is also slidably mounted on the polish rod above the hanger bar. Such casing 32 comprises an inner cylindrical .side wall 34, an outer substantially cylindrical side wall 35, an annular bottom wall 38, and an annular cover plate 40. The inner cylindrical wall 34 has an internal diameter slightly larger than the diameter of the polish rod so that-such wall fits suf ficiently loosely on the polish rod and will freely slide over the polishrod. The outer side wall 36 is provided with an outwardly projecting portion 42 for supporting an actuating pawl 48. Otherwise, the wall 36 is cylindrical and coextensive vertically with the inner wall 34, and is spaced laterally from theinner wall 34 so as to provide an annular space to receive the ratchet turntable, the bearings therefor and a body of lubricant. The bottom wall 38 extends from the bottom of the side wall 3 1 to the bottom of the side wall 36 and completely closes the lower end of the space betweenthe side walls. Preferably, the walls 34, 36, and 38are made integral with each other.

Preferably, the casing 32 is not fastened to the hanger bar-22, but is normally supported by and only frictionally engages the hanger bar. If desired, the lower surface of the bottom wall 38 may be roughened as shown so as to increase the friction between it and the upper surface of the hanger bar andto further hinder any rotation of the casing. However, it will be understood that the casing 32 may be detachably secured to the hanger bar-by any suitable means, such as a flange or lugs at the lower portion of the casing and blots and nuts or the like. Also, if desired, the casing 32 may be permanently secured to the hanger bar or made integral therewith, but such construction is generally undesired as it will prevent removal of the casing and the rotating mechanism from the polish rod independentlyof the hanger-bar. r

A ratchet turntable 44 is rotably mounted within the casing 32 on roller bearings 46 of conventional design. Obviously, ball bearings, or bearingsofother conventional types, may be substituted for the roller bearings. The ratchet turntable is operated by anactuating pawl 48 pivotally mounted on the eccentric 50 on the end of a shaft 54. As shown, the shaft 54 is rotatably mounted in ball bearings 56 in the outwardly projecting portion 42 of theouter wall 36. The outer end of the shaft 54 carries a lever 58 which is connected to the beam l2 by a cable 60 in the usual manner. A holding dog 62 is pivoted on pin "64 mounted in the side wall 5 36 Such: holding'izdogi 62' engages the ratchet teeth of the ratchet turntable in the usual manher to-' prevent reverse rotation of T the ratchet tu'r'iit'alolei The outer wall: 36}-is"provided. with one or more oil" holes 66 for the introduction of -oiloi' other lubricant through an oil cup'or the like. Such oil hole is generally positioned above the ratchet turntable soithat theibody of oil in'- the casing: will cover the ratcHet-turntable and provide a layer of protective lubricant o'ver'the teeth of-th'e' ratchet.

A'sshowm'a cylindricalwall or ring. 6'8 ispositi'o'ned between thesisid walls 34 and" 36s and preferably. inwardly of the .teeth of the ratchet turntable =44; Suchcylindrical'wall'68 rests upon and is supported by the ratchet turntable. The lower end of the wall 68' is'flrmly secured to the ratchet turntable by set-.-pins-'10.-o'r the like. The upper end ofthe cylindrical wall 6'8. abuts'against and supports the'coveriplate lfl. Such -cylindrical wall 68' is firmly secured to the cover plate by screws 12 as shown in'Figurei3., Thus-'the cover plate 40. is supported by and firmly securedto the'ratchetturntable'44 for rotation therewith. i The cover plate ill-is-annularand extends over the ' endsof theside walls 34 and 36" and over the annular space between them so as to prevent dirt-rain, ice and'snow from'entering into the casing; The inner bore of the cover plate is slightly larger in diameter than the diameter of the polish rod so that it fits loosely on the: polish rod and will freely slide thereover. The outer edge of the cover plate may'extend beyond the sidewall 36 by any desired amount.

Adjacent its inner edge, the underside of the cover'plate 40 is provided with an annular recess 14 to receive thevtapered upper end of the inner side wall 34. The under surface of the cover plate 40 is also provided with-an annular recess 16 near itsouter edge to receive the 'upper end of the outer wall 36. Preferably a snap ring 18 is provided in theouter surface of the upper end of the outer wall 36 between such wall and the vertical surfaceof therec'ess lfi inthe cover plate was to more certainly: prevent the 'en- ,1

modate the fastening means for securing them together and-to the-polish rod, and is of substantial height to providea large surface-contact with the polish rod. The mutually contactingsurfaces-of the clamp and'ofthe-cover plate. maybe roughened to increase the friction between them, or smoothed to decrease'the friction, as-desired. Also, the form of the clamp maybewidely varied, particularly to vary'the area ofthe, surface which contacts. the cover plate soas to vary "the friction between them, suchas by providing an outwardly extending flange-at the lower end of the clamp.

Figure- 6 illustrates a slightly. modified .form of the structure shown in Figures 3 to-5. In

this modified form, the cylindrical wall 68 is secured to the cover plate H) by'welding, as shown at 86. Also, a single annular recess 88 is provided in thelower' surface of the cover plate; 40 to reeeive'the upper ends of bothof the endwallsa34 ari'ctSt;-

Inanormal -operation; the polish rod 24 wilhb'e carried by the" clamp 80" which i is. supported? by the hanger bar 22: through: the cover plate 40, the cylindrical wall- 68, i the turntable 44;..and the casing 32. Upon operation of the. rbeker beam [2, the polish rod? will be reciprbcated-by reciprocation of the hanger bar 22 in :the :manner well known to the art.- At'the same time,.the actuating pawl 48' will be operated' in theqcorrventional manner to. intermittently rotate the ratchetturntableand: the cover' plate 40:, and the" cover plate will transmit. such motion to the-clamp 80 and the polish rodthrough friction between the upper surface ofthe coverplateand the bottom surface of the clamp. However; if

the: downward motion of the polish rod 24 is prevented by an obstruction in the well orthe pumpzor for other reasonythe hanger bar; and the c'asing 32-willcontinue their downward movement; sliding over the polish rod 24.; and-the cover-"plate 40: will be immediately disengaged fron'r the clamp 80', whereby continued operation of the ratchet pawl and ratchet: turntable will be inoperative to-rotatethe polish rod. When the hanger bar isthereafter moved upward,-.it will carry the casing: 32 withit, but the cover plate 40 will not'engage the, clampgfifliuntilwit has: been raised to the position-at; which the downward motion of the polishrod and the clamp had stopped. Further upward motion of the hanger; will usually lift the polishrodfrom the obstruction before-the friction, between the cover plate and the clamp; becomes sufficient: to cause therotating'mechani-smtoexert any-f appreciable rotatingstress'on the polisharodr If, due toyany difficulty in theoil well or-pump; the rotation of the polish rod isprevented or: seriously resistedwhile it is supported by theha-nger and rotator, the continued. operationof the ratchet turntable will fail to impose any damaging torsional stress on the polish rod, because of; the frictional engagement-of-thecover plate 4ll-with the clamp 80 whichwill permitrotati'onof; the plate 40 independently of the clamptl] .vjhen the force,- required' to rotate the polish rod, be-

comesexcessive; v g 7 It will be understood that the structure, shown in the drawings and described in detail; is-'- given solely for illustrative purposes; and that; many variations "and modifications may be madetherein-without-departing from the spiritor scope of my invention.- Forexample, the cover plate; 40 and the turntable maybe-secured together by other suitable means; such as; bars,--ro ds; bolts and nuts, a lattice-likeframeworlg', and the;like. Also,- the ratchet turntable may be turned over with the ratchet teeth and actuating pawl beneath and the turntable placed against-the bottom of the cover plate" and secured thereto by welding, screws, bolts and nuts: and the like. Some other modifications have been indicated in the detailed description. Still'oth'er .modificaa tions willbecome apparent to those skilled'in the art.

From all "of the: above, it will be apparent-that I haveprovided' asimple and sturdy polishrod hanger and rotatorwhich has many. advantages over the structures of the prior art: The ratchet turntable and pawl are protected from rust,- dirt, ice and snow 'so that' they will remain operative over long periods of time irrespective ofw'eather conditions and are keptwell lubricated so that their useful life is greatly extended: At the same time-,- the rotating mechanism-is immediately renderedvinoperative When the-desired motion-o1 the polish rod is hindered inany way. Also; the hanger and rotator are free to move downward on the polish rod to any extent required by the position at which the downward motion of the polish rod is stopped and will not exert'any objectionable stressesion the polish rod. .Further, the hanger and rotator automatically restore and maintain the normal operation of the polish rodwhenany obstruction is removed. Furthermore, the casing and rotating mechanism are readily installed and removed for repairs, replacement or cleaning. Thus, it will be apparent that my invention constitutes a valuable contribution and 'advancein the art.

. I claim: v

. 1. 'A polish rod hanger and rotator; adapted to support a polish rod and to impart areciproeating motion and an intermittent rotating motion to the polish rod, which comprises a vertically reciprocating hanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and supported by the hanger bar, which casing comprises an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall at the lower end of the side walls completely closing the lower end of the nnular space between the side walls, an annular cover plate rotatably mounted over the side walls and covering the upper end of the space between the side walls; a ratchet turntable rotatably mounted within the casing between the side walls; means between the side walls firmly securing the cover plate to the ratchet turntable for rotation therewith; a ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate.

2. A polish rod hanger and rotator, adapted to support a polish rod and to impart a reciprocating motion and an intermittent rotating motion to the polish rod, which comprises a vertically reciprocating hanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and supported by the hanger bar, which casing comprises an innercylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially, cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall extending from the lower-end of one side wall to the lower end of the other side wall and completely closing the lower end of the annular space between the side walls, an annular-cover plate rotatably'mounted over the upper ends of the side walls and extending over the upper end of the annular space between the side walls, the lower surface of the cover plate being recessed to receive the upper ends of the side walls; a ratchetturntable rotatably mounted within the casing between the side walls; means between the side walls firmly securing the cover plate to the ratchet turntable for rotation therewith; a ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod=above the cover plate and normally supported by'and only frictionally engaging the upper sur= face of the .cover plate.

3. A polish rod hanger and rotator, adapted to support a polish rod and to impart a reciprocating motion and an intermittent rotating motion to the polish rod, which comprises a vertically reciprocatinghanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and supported by the hanger bar, which casing comprises an inner cylindrical side wall having an internal, diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall extending from the lower end of one side wall to the lower .end of the other. side wall and completely closing the lower end of the annular space between the side walls, an annular cover plate rotatably mounted over the upper ends of the side walls and extending over the upper end of the annular space between the side walls; a ratchetturntable rotatably mounted within the casing between the side walls; a cylindrical supporting wall extending from the ratchet turntable to the cover plate between the side walls of the casing and firmly secured to both the turntable and the cover plate; a ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate;

4. A polish rod hanger and'rotator, adapted to support a polish rod and to impart a reciprocating motion and an intermittent rotating mo+ tion to the polish rod which comprises a vertically reciprocating hanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and supported by the hanger bar, which casing comprises an inner cylindrical side wall having aninternal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall extending from the lower end of one side wall to the lower end of the other side wall and completely closing the lower end of the annular space between the side walls, an annular cover plate rotatably mounted over the upper ends of the sidewalls and extending over the upper end of the annular space between the side walls, the lower surface of the cover plate being recessed to receive the upper ends of the side walls; a ratchet turntable rotatably mount ed within the casing between the side walls; a cylindrical supporting wall extending from the ratchet turntable to the cover plate between the side walls of the casing and firmly secured to both the turntable and the cover plate; a ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate.

5. A polish rod hanger and rotator, adapted to support a polish rod and to impart a reciprocatmg motion and an intermittent rotating motion to the polish rod, which comprises a vertically reciprocating hanger bar slidably mounted on the zpollsh rod; -ra wlosed 'substantially annular thedow er end of the annular space betweenthe side -walls, an' annular cover .plate rotatably mounted over'the side wallsvand coveringthe uppercend or 'the =spacebetween the side walls; a ratchet turntable rotatably mounted within the casing between the side walls; means between the side walls firmly securing the, cover plate to the ratchet turntable for rotation therewith; a ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate.

6. A polish rod hanger and rctator, adapted to support a polish rod and to impart a reciprocating motion and an intermittent rotating motion to the polish rod, which comprises a vertically reciprocating hanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and normally supported by and only frictionally engaging the hanger bar, which casing comprises an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical sidewall spaced laterally from the inner side wall, an annular bottom wall extending from the lower end of one side wall to a the lower end of the other side wall and completely closing the lower end of the annular space between the side walls, an annular cover plate rotatably mounted over the upper ends of the side walls and extending over the upper end of the annular space between the side walls, the lower surface of the cover plate being recessed to receive the upper ends of the side walls; a ratchet turntable rotatably mounted within the casing between the side walls; means between the side walls firmly securing the cover plate to tho ratchet turntable for rotation therewith; a

ratchet actuating pawl mounted in the casing; pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate.

'7. A polish rod hanger and rotator, adapted to support a polish rod and to impart a reciproeating motion and an intermittent rotating motion to the polish rod, whichcomprises a vertically reciprocating hanger bar slidably mounted on the polish rod; a closed substantially annular casing slidably mounted on the polish rod above the hanger bar and normally supported by and only frictionally engaging the hanger bar, which casing comprises an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall extending from the lower end of one side wall to the lower end of the other side wall and completely closing the lower end of the 'anular 'space betweentheside walls, an :annular cover "plate rotatably mounted over -the upper ends pf "the side walls and extending over {the upper-end of the annular space between the side walls, the-lower surface of the cover platebeing recessed" to receive the upper ends of the side walls; 'a ratchet turntable rotatably 'mounted within the casing between the side walls; acylinclricalsupporting wall extending from theratch et turntable to the cover plate :between the -side walls-of the casing and firmly secured to boththe turntable and the cover plate; a ratchet -,a'ctu,ating .zpawbnlounted in the easing; pawl -actuating means outside: of the casing operatively connected to the ratchet actuating pawl; and a clamp firmly secured to the polish rod above the cover plate and normally supported by and only frictionally engaging the upper surface of the cover plate.

8. A polish rod rotator which comprises a closed substantially annular casing adapted to be slidably mounted on a polish rod above a hanger bar, which'casing comprises-an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall at the lower end of the side walls completely closing the lower end of the annular space between the side walls, an annular cover plate rotatably mounted over the upper ends Of the side walls and covering the upper end of the space between the side walls; a ratchet turntable rotatably mounted within the casing between the side walls; means between the side walls firmly securing the cover plate to the ratchet turntable for rotation therewith; and a ratchet actuating pawl mounted in the casing; and pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl.

9. A polish rod rotator which comprises a closed substantially annular casing adapted to be slidably mounted on a polish rod above a hanger bar, which casing comprises an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall at the lower ends of the side walls and completely closing the lower end of the annular space between the side walls, an annular cover plate rotatably mounted over the upper ends of the side walls and extending over the upper end of the annular space between the side walls, the lower surface of the cover plate being recessed to receive the upper ends of the side walls; a ratchet turntable rotatably mount ed within the casing between the side walls; means between the side walls firmly securing the cover plate to the ratchet turntable for rotation therewith; and a ratchet actuating pawl mounted in the casing; and pawl actuating means outside of the casing operatively connected to the ratchet actuating pawl.

10. A polish rod rotator which comprises a closed substantially annular casing adapted to be slidably mounted on a polish rod above a hanger bar, which casing comprises an inner cylindrical side wall having an internal diameter slightly larger than the diameter of the polish rod, an outer substantially cylindrical side wall spaced laterally from the inner side wall, an annular bottom wall at the lower ends of the side 1 1 walls and completely closing the lower end of the'a'nnular space between the side walls, an annular cover plate rotatably mounted over the upper ends of the side walls and extending over the upper end of the annular space between the side walls, the lower surface of the cover plate being recessed to receive the upper ends of the side walls; a ratchet turntable rotably mounted withing the casing between the side walls; a cylindrical supporting wall extending from the ratchet turntable to the cover plate between the side walls of the casing and firmly secured to both the turntable and the cover plate; and a ratchet actuating pawl mounted in the casing;

and pawl actuating means outside of the casing 15 12 operatively connected to the ratchet "actuating pawl.

CALVIN W. SHELTON.-

REFERENCES CITED I The following references are of record in the file of this patent:

UNITED STATES PATEnTs 10 Number Name Date 1,681,789 Sargent Aug.21, 1928 2,180,880 Poulsen Nov. 21, 1939 2,280,408 Johnston. Apr. 21, 1942 2,444,842 McConahey et a1. July 6, 1948

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