US2282629A - Liner pulling device - Google Patents

Description

/N vf/v To@ CLARf/vci WH/rf; OL/ VfR 5. GRA HAM @Y #ARR/J, MECH, F057' R a HAR/N5 Patente-d May 12, 1942 UNITED STATES PATINT `OFFICE.

2,2%,629 Y v LINER PULLING DEVICE Clarence White', `Walnut 1-1ark, and Oliver B. .i Graham, Los Angeles, Califassignors to Oil Well Manufacturing Corporation, Los Angeles, j Calif., a corporation of California i Application December 15, 1939, serial No. 309,374

4 claims. (co1. 2er-38.2)

Our invention relates to devices for pulling an linsert member from a bore. The device andthe equivalent embodiments thereof are adapted for pulling various pieces of equipment from oil well pump tubing, such as valves .and liners, and for f .pulling the liner from the bore of a slush pump.

It is in connection with the latter use that we have illustrated the device in the drawing. It Vshould be understood, however, that we do not intend the scope ofthe invention to be limited .to use in connection with slush pumps or for use solely in pulling liners from pumps, this embodiment being chosen for the purposes of illustration and description,

It is one of the objects of our invention to prof vide a device operable from the exterior of a body .such as a slush pump to `engage an insert' member in a bore within the body such as a cylinder, and

.particularly a cylinder liner having a Yrelatively vthin wall, the device being operable to exert forces sulicient to break the liner loose from the Abore in which it is inserted and to withdraw the liner therefrom.

. .It is another object of our invention to provide a device of th'e character mentioned which in- `cludes a pulling mechanism comprising several -separate members which will not .become mutually disengaged in the operation of the device.

It is another object of our invention to provide a device of the character mentioned which includes a grasping mechanism of a relatively few strong parts which will positively engage both the bore and the inner end face of a liner or other insert, and particularly a liner or insert having a 'relatively thin Wall, the grasping device having its parts assembled upon and interlocked with -the pulling mechanism.

These and other objects and features of our invention will be apparent from a perusal of the following part of the specification in connection with the accompanying drawing and the appended claims.

- In the drawing:

Fig. 1 is a longitudinal fragmentary section through a cylinder such as th'e cylinder of a slush pump, and illustrates the manner in which the device embodying the features of our invention is installed for the operation of pulling a relatively thin liner from a pump cylinder.

. Fig. 2 is a cross section of the pulling device r taken along the-line 2-2 of Fig. 1. i

Fig. 3 is a cross section of the pulling device taken along the line 3-3 of Fig. 1.

Fig. 4 is a longitudinal fragmentary section .similar to Fig. l, showing the grasping mecha- `nismincolla'psed position in which it is adapted.

for the step of inserting it within the cylinder.

In Fig. 1 of the drawing, the grasping mecha- Y .nism is shown in position `ready to pull a liner from a cylinder. Thenumeral indicates the pump body having a bore |2 therein. An insert liner I3 in the form of a sleeve provides a pump cylinder bore` |4.. The pump body is Yformed ried by a pullerbolt or stem 2| and a means for '.28 which engages the bolt 2| and imparting longitudinal movement to the bolt 2|, which means is generally indicated on the drawing by the numeral 23.

A grip expanding nut 24 having a frustro-conical rim surface |6 is threaded upon the `puller `bolt 2| withits small end |'l facing toward the opening |5, The larger end 26 is disposed adjacent the inner.` end of the puller bolt 2| and is diametrallyslotted at 21 to receive .a cotterfpin prevents the nut 24 from turning thereon.

:A plurality of segmental expanding gripsl 2,9

are .circumferentially spaced about the nut 24. Each of these grips constitutes the segment of a ring, and eachtwo, grips areV separated by a radially disposed gap 3U. The inner bore surface 3|v of each grip 29 is conically shaped to lit the conical rim'surfacey I6 of the nut 24. Each of the-grips '29 is also machined to present a segment 32 of a cylindrical surface diametered to slidably t Within the bore |4 of the liner I3, a V ,segment 33 of a cylindricalsurface of larger di- .ameter Vthan that of the segment 32, and a seg- -ment 34Y of a cylindrical surface of smaller diameter than that of the segment 32.

The'vcylindrical segment 33 at the inner end of 'the grip 29 lprovides an annular shoulder 35 adapted `to engage the innerend of the liner '|3. The cylindrical'segment 33 is of thesame or Apreferablyofv somewhat smaller diameter thanV theoutside diameter-of the liner |3,` enabling the grips 29 when in Aexpanded position to be withj drawn through the bore of the pump body andyet have a maximum contactual surface engagement with the inner end 36 of the liner. I3.`

Between the cylindrical segments 32 and -`34 of'each' grip :29is'a circumferential groovev 3l which extends radially inwardly from the web 4I and projects into and has annular sliding engagement with the side walls of the .grooves 31. The length of the web 4I' is s uch that the position of the flange 42 within the side walls' ofthe groove 31 permits endwise contact between the faces 39 and 40. s

A cylindrical socket wrench 43 is concentrithis application is not concerned with the details of construction of the means 23, reference is herein made for a detailed description of this means to our Patent No. 2,039,371. It is sulficient for the purposes of this application to describe the means 23 for imparting longitudinal `movement of the bolt 2| as comprising a bridge member 54 having a transverse body portion 55 provided at each end thereof with a pressure foot 56 adapted to engage an outer surface 51 of the pump body so that the body portion 55 is ex- Utended across the bore I2 substantially in the cally mounted about the bolt 2| and isA provided Y ally disposed ribs 4 5 formed integrally with and projecting longitudinally outwardly from the body of the nut 38, and is provided at its outer end with handles-41 which are rigidly secured vto the wrench 43 and the sleeve 43a which is rotatably mounted upon the bolt 2|.

A collar 48 is rigidly secured in Vfixed position upon the bolt 2| at such a position therealong that it is spaced a short distance from a hub portion 49 of reduced diameter of the nut 38. This collar 48 affords a shoulder for positively' stopping movement of the nut 38 along the bolt 2|. Otherwise as the nut 38 isr rotated with respect to the bolt 2| in a manner to cause it to move upward to the end of the threaded portion of the bolt 2| the threads of the nut might become jammed on the unthreaded portion of the bolt 2| and be difficult to dislodge for a subsequent movement downward on the bolt 2|.

The radial distance between the bore faces 53 of the outer or upper end portions of the segmental grips 29 and the bolt 2| is less than the depth of that portion of the flange 42 which is radially inside the rim faces 34 of the segmental Y grips 29 when the latter are in operative position of engagement with the liner I3. The: radial distance between the bore faces 53 and` the' bolt 2| is somewhat greater than the thickness ofthe liner to be pulled. It follows from these. relationships that when the nut 38 is withdrawn longitudinally of thev bolt 2| a sufficient distance from the nut 24 to enable the. bore faces 53 of the segments 29 to be moved radially into contact with the bolt 2| the entire pulling structure 29 can be inserted within. the bore I4 but that the several segments willbeheldrin assembled. relationship with respect to the bolt 2| and. nuts 24 and 38 by reason of the engagement. of the flange 42 with the slots 31 ofthe segments. 'I'.o -disassemble the segments 29 the cotter pinY 28 is removed, the nut 24 is unscrewed from the bolt 2| and the nut 38 is moved downward of the bolt 2| at least to a point at which its face 39 Vis flush with the lower end ofthe bolty 2|.. The segments 29 can then be moved radially inwardly to clear the inner edge 52 of the iiange 42.

Our invention includes in combination with the pulling mechanism 20 the means 23 for moving the bolt 2| longitudinally of the cylinder bore I4 for operation of the pulling mechanism 20 to pull the liner I3 from the bore I 2.. The

means 23 is. arranged andv constructed in substantially the same manner as that shown and describedin our Patent No. 2,039,311.V

manner shown in Fig. 1, a nut 58 having threaded engagement with the bolt 2|, and a roller thrust bearing 59 `interposed .between the nut 58 and the transverse body portion 55 of the bridge member 54.

In the operation of the device, the position of the nut 24 on the bolt 2| is regulated by means of the cotter pin` 28 so that when the nut 38 is at its eXtreme outer position along the bolt 2| Ain which it is in contact with the collar 48,the segmental gripsl 29 are free to move inwardly toward each other sufficiently that their shoulders 35 are inside-the liner bore I4. 'Ihe grips `are held in assembled relationship with each other and the otherv parts of the device by the flange 42, stem 2|, and nut 24 for all positions of the nut 38 and of the socket wrench 43 by which the nut is operated.

With the nut V38 in its outermost position -against the stop 48 and with the segmental grips 29' consequently at their radially innermost position, the entire pulling mechanism 29 is inserted within the bore I4 of the liner I3 until the shoulders 35 of the segmental grips 29 have moved beyond and inside the inner end of the liner I3. TheV socket wrench' 43 is then turned in a direction to move the nut 38 and the segmental grips 29 inwardly along the bolt 2|. The grips 29 by reason of the engagement of their conical bore surfaces with the nut 24 are expanded radially outwardly as they are moved longitudinally inwardly of the bolt 2 I. When the rim surfaces 32 of the grips 29 contact the inner bore surface I4' of the liner I3', the bolt 2| and pulling assembly 28 are moved longitudinally outwardly until the shoulders 35 engage the inner end surface of the liner I3. The bridge member 54 and nut 58 are then placed in position, and the nut 58A rotated, with the result that the bolt 2|, pulling means 28, and liner I3 are withdrawn by a force sufficient to overcome the forced lit of theliner I3 within the cylinder bore.

We havedescribed herein one embodiment of our invention, but it is capable of many other embodiments which come within' the' terms of the appended claims.

We claim as our invention:

l. In a device for pulling. an insert sleeve from a bore, the combination of: a stern adapted to be extended inwardly of said bore; meansassociated with said stem for moving it longitudinally outwardly of said bore; a plurality ofannularly dis- ;posed segmental grip members each provided with a shoulder at one end for engagement with the inner end face of theinsert sleeve, and each having a conical bore face directed inwardly o'f said bore, a portion of reduced diameter extending from the end face opposite said shoulder end, and an outwardly facing annular groove between said portion ofV reduced diameter and the remainder of said grip'; a grip expander threaded upon said stem having a conical rim face mating Since the invention which isY the subject `of 75 .with said conical bore faces; an adjustingv nut threaded on said stem having an endwise engagement with said grip members for expanding said grip members on said mating conical faces; an integral web carried by said adjusting nut encompassing said reduced portion; an integral, inwardly extending, annular flange carried by said web, projecting into said groove and adapted to hold said adjusting nut and grips in assembled j relationship longitudinally and radially when said'nut and grips are in assembled position on said stem; and a stop limiting threaded movement of said grip expander away from said adjusting nut.

2. In a device for pulling an insert sleeve from a bore, the combination of: a stem adapted to be extended inwardly of said bore; means associated with said stem for moving it longitudinally outwardly of said bore; a plurality of annularly disposed segmental grip members each provided with a shoulder at one end for engagement with the inner end face of the insert sleeve, and each having a cylindrical peripheral face for engagement with the bore face of the insert sleeve and each having a conical bore face directed outwardly of said bore; a grip expander threaded nut for relatively longitudinal movement at a radial position of said grip members centrally inside of said stem contacting position; and a re-v movable stop limiting movement of said grip ex'- pander away from said adjusting nut.

3. In a device for pullingan insert sleeve from Y a bore, the combination of: a stem adapted-to be extended inwardly ofthe bore; means associated with said stem'fcr moving it longitudinally outupon said stem and having a conical peripheral Y face mating with said conical bore faces; an adjusting nut threaded on said stem and having endwise engagement with said grip members for expanding said grip members on said vmating conical faces to move said cylindrical peripheral faces into engagement with the bore face of the wardly of the bore; a plurality of annularly disposed segmental grip members, each provided with a shoulder for engagement with the inner end face of the insert sleeve, with a cylindrical rim face shaped for solid, axially extended engagement with the bore face of the insert sleeve; and with a conical bore face set at an angle to the axis of said rim face and tapering away from said axis in a direction outwardly of said bore;

Y a grip expander secured upon said stem having a conical rim face forming an angle with the axis cf the bore of the same degree as said first-mentioned angle, whereby said grip member may simultaneously solidly engage both the insert Y sleeve bore face and said expander rim face for a` substantial distance axially of said grip member ;V

- to said stem.

and releasing said grip members and adjusting Y CLARENCE VSH-IITE.` OLIVER B. GRAHAM.

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