US1570338A - Device for removing pump liners and valve seats - Google Patents

Description

Jan. 19 1926.

' B. H. DAVIS DEVICE FOR REMOVING PUMP LINERS AND VALVE SEATS Filed April 12, 1923 Patented Jan. 19, 1926.

UNrrEo STATES 1,570,338 PATENT OFFICE,

BERNARD H. DAVIS, 01' FULLERTON, CALIFORNIA.

DEVICE FOR REMOVING PUMP LINERS VALVE SEATS.

Application filed April.12, 1923. Serial no. 631,739.

To all whom it may concern:

. Be it known that I, BERNARD H. DAVIS, a citizen of the United States, residing at Fullerton, in the county of Orange andv State of California, have invented new and useful Improvements in Devices for Removing Pump Liners and Valve Seats, of which the following is a specification.

My present invention is an improved device for removing the liners and valve seats of pumps, and particularly those pumps that are utilized for pumping mud, sand, or

' the like from oil Wells, the principal objects of my invention being to provide a relatively simple, practical device that may be readily inserted within a pum-p cylinder or valve seat, or the like, and which, when properly manipulated, will readily unseat the liner or valve seat therefrom.

It will be understood that pumps that are utilized for pumping mud, sand, and

the like from well holes are commonly provided with removable liners, these being ordinarily straight cylinders, and with. removable seats for the valves, these seats being ordinarily slightly tapered. The mentioned removable parts, and also bushings' and similar elements, which may hereinafter be referred to simply as lining elements, very frequently become rusted into a pump,

' with the result that much time and labor have heretofore been involved in removing these parts when the same have become so worn as to render them unfit for further.

service. 4 g

It is an object of my invention to provide a relatively simple device comprising parts which may be easily and quickly engaged on the inner end of a lining element to withdraw the same from its working position within a pump, or the like, and which may also be used to put a new or old liner into position.

It is a further object of my resent invention to provide means of t e general character, referred to which, although it may utilize the principle of the screw as well as that of the wedge in effecting an engagement of parts, shall neverthelem be, after its liner-engaging parts are properly disposed relatively to the liner element, entirel free from any wedging effect tending to dlstort such liner element, or tending to y increase the frictional'engagement between any lining element which is to be removed andany outer tube or shell within which it may have been seated.

It is a further object of my invention to provide a ruggedtool, which may preferably comprise ball-bearings, adapted to be made 00 in standardized sizes, the work-engaging or grapple parts of my pullers being preferably of such configuration as to be easily collapsible for insertion through a liner element and adapted to be thereafter expanded I into a substantially cylindrical form, with projecting lugs or flanges engaged beneath or beyond the back of the liner element which is to be removed, it being a merit of my preferred design that the wedging element by which my grapple is expanded may be at all times housed substantially therein, so that only a very limited bottom clearance (corresponding to the thickness-of the mentioned lugs or flanges) is required to permit the engagement of said lugs or flanges.

Other objects of my invention will appear, from the following descri tion of a preferred embodiment thereof: appended claims, taken in connection with the accompanying drawings, in whic Figure 1' is a vertical section, with parts broken away, showing the relative position of parts of a puller of my design as the 8 detail to the parts of those my invention which I have chosen for purposes of illustration, 1 may be regarded as a pump cylinder, or the like, provided with a liner 2, which is to be removed, and the essential parts of, my improved device for the removal thereof will now be described. A spanning element or oke 3, which may be a casting rovided with a central aperture 4 and a she der 5, is adapted to receive a drawbar $3 provlded at and from the 39 bottom of a 9 showone end with means for imparting movement thereto, such as the tightening nut 7, and at the other end with a grapple of novel design, any preferred type of ball-bearings, or the equivalent comprising rolling elements, being optionally provided in the form of a collar 8, adapted to engage respectively the shoulder 5 and the nut 7, or the equivalent, this nut being shown as having a threaded engagement with the drawbar 6, and the respective legs of the spannin element 3 being adapted to engage the cyllnder 1, from which the liner 2 is to be removed.

To eflect the removal of the mentioned liner, or the removal of'a valve seat in the manner suggested in Figs. 5 and 6, I prefer to employ a grapple element comprising relatively swinging parts 9, shown as-pivoted together at 10, and as adapted to be collapsed sufliciently to permit insertion through a liner, in the manner shown in Fig. 1, these swinging parts being provided with inclined inner surfaces 9, adapted to be engaged by ahead 11 upon the end of the drawbar 6, the upper edge of the substantially cylindrical head 11 being preferably tapered, beveled or rounded, to facilitate its movement relatively to the inclined surface 9, in order that by a pull upon the drawbar 6, the head 11 may be effective to wedge the swinging elements 9 apart, in the manner shown in Figs. 2 and 5, so that the lugs or flanges 12, upon the lower ends of said swinging elements, may efi'ectively engage under the bottom. of a liner element, in readiness for the withdrawal of the same. As will be obvious from an inspection of Fig. 2, the first effect of the upward movement of the head 11 is a relative expansion of the swinging elements 9; and when these elements are expanded into a substantially cylindrical form, or into another form suitable to the interior configuration of a liner element which is to be removed, the body of the head 11 being adapted to interfit therewith, no further wedging effect can be produced by further tension upon the drawar; but since the upper ends of the swinglng elements 9 are respectively provided with abrupt or undercut shoulders 13, adapted to en age with a corresponding or substantially flit surface upon a correspond- 1ng shoulder T, located at the upper end of the head 11, a further u ward movement of the drawbar 6 can be e ective only to draw a lining element from its 'seat. By continued rotation of the nut 7 upon the drawsame with bar, a lining element, having been loosened or unseated in .the manner described, may be completely wiithdrawn.

I When a grapp e of my im roved desi is to be used for the unseating of cylind i ihal 1111618 only, it is not necessary to provide the slots such as are shown at N; but, when a valve seat 14 of the character shown in-Figs. 5 and 6 is to be withdrawn, such avalve seat being provided with integral transverse webs 15, it will be understood that the mentioned slots N will serve to allow clearance for the mentioned webs, permitting the lugs or flanges 12 to engage under the valve seat and to become effective in the withdrawal of the same. As best shown in Figs. 1 and 2, the bottom of the head 11, which is integral with or secured to the drawbar 6, may be provided with a concavity 15?, to provide room for parts of, or for elements associated with the valve seat 14, it being understood that any desired minor changes may be made in the design of parts in order to adapt them to a particular use.

As will be obvious from an inspection of the figures, it is intended that the parts above mentioned shall be -so proportioned that, when the head 11 shall be positioned substantially as shown in Fig. 1, the entire grapple is so collapsed that no. diameter thereof shall exceed the internal diameter of the liner element which is to be withdrawn thereby; but that whenever this head is drawn into substantially the position shown in Fig. 2, it shall be operative to effect an expansion of the swinging eles ments 9 into the form of a cylinder, or into other form adapted to fit within a liner element without producing lateral pressure thereon; and since the head 11 is adapted to permit a collapse of the entire grapple while confined therein, it will be obvious that, in order to permit of the positioning of a grapple of my preferred design, there is need of only sufiicient clearance, beneath a liner, to permit the insertion of the lugs or flanges 12, the onl effect of a subsequent advance of the draw ar 6': being the lifting .of a liner element from its seat.

In that form of my invention which is shown in Figs. 5 and 6, it will be noted that the head 11 is virtually a frustum of a cone, but in this form also I provide a shoulder 1; having a flat top adapted to contact with the shoulders 13 upon the in terior of the swinging elements 9.

Although I have described but two embodiments of my present invention, it will be understood that various features thereof may be independently used, and that various modifications may be made therein without departure from the spirit and scope of my invention as the same is indicated above and in the following claims; and also that my pullers may: be used not only to remove liners but also to draw them into place (the drawbar 6 then extendin through, for (example, the opening 16) an for any other desired purpose.

' What I claimvis: 1':

1. A puller comprising *a drawbar, a grapap pose about the drawbar, a head fored e formed of swinging elements dis straight surfaces of said elements, and means for pulling the drawbar causing said head to engage said tapered surfaces to expand said swinging the straight be of swinging elements pivote to each other elements and then to engage surfaces, whereby the grapple may pulled by the drawbar withoutfurther exf interior of the grap le,

v be engaged by sai anding said elements. v v

2. A' puller comprising a drawbar, a grapple formed of swinging elements dis-' posed about the: drawbar, a head formed 'upon' the drawbar and normally disposed within the grapple, there being frusto-conical and cylindrical surfaces formed upon the and means for pulling u on the draw ar, whereby said head may rst engage the frusto-conical' surfaces to expand the grapple and then engage the' cylindrical surfaces whereby the grapplemay be pulled by the drawbar without further expanding thegrapple.

3. A puller comprising a drawbar, a rapple disposed about the drawbar, a hea ormed'upon the drawbar and normally disposed within said grapple, said grapple aving interior tapered surfaces adapted to (1 head, means forming an abutment for'the head adjacent the top of the ,grapple, and means drawbar whereby said head may be .caused to engage said tapered surfaces to expand ment, a draw bar ada through said spannmg element,

gageable by about said draw bar. for pulling said the grapple and then engage the abutment, whereby the apple may e drawbar .wit out further grapple. 7

4.- A puller comprising formed u on the drawbar,

expanding the a drawbar, a head arapple formed being tapered sur- .grapple engageable by said head to expand and means forming an abut-- said tapered drawbar is the grapple, ment upon the grapple above surfaces whereby when the then pulled by t e drawbar upon engagement between said head and said abutment.

5. A puller, comprising a spannin eleted to be with rawn adapted to 'be' rotated upon said draw bar for withdrawing the draw bar from said spannin element, an antifriction bearing dispose bar, a grapple=composed of swinging elements having ta red interior. surfaces ensai head, said swinging elements being pivoted together and secure In testimony whereof I have signed my name to this specification.

' BERNARD H. DAVIS.

means with-in said means and said s an d mng element, a head carried by said raw pulled by-the pulled, the grapplle will be expanded and

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