US2253836A - Means for dislodging objects embracing a rod or the like - Google Patents

Description

8- 1941- c. YWHITE 53,836

MEANS .FOR DISLODGING OBJECTS EMBRACING A ROD OR THE LIKE Filed June 8, 1938 2 Sheets-Sheet 1 HARRIS) K/ECH) F0; TER a HARR-AS 3? F0 H /R A TTORNEYJ Aug. 26, 1941. Q w n- 2,253,836 MEANS FOR DISLODGING OBJECTS EMBRACING A ROD on 'IIHE LIKE File d June 8, 1958 2 Sheets-Sheet 2 INVNTOR. CLARENCE WHITE av HARR/J, K/ECH, FOSTER & HAR/Z/J A TTORNEYJ Patented Aug. 26, 1941 UNITED STATE MEANS FOR DISLODGING OBJECTS EMBRACING A ROD OR THE LIKE Clarence White, Walnut Park, Calif.

1938, Serial No. 212,508

Application June 8,

'7 Claims.

7 My invention relates to mechanical devices designed for such purposes as removing wheels from axles and removing pistons from piston rods. While my invention has utility in a number of fields, it has been found to be applicable with peculiar advantages in the oil well industry for the purpose of dismounting slush pump pistons from piston rods, and, without limiting my invention to such application, I shall describe a preferred form of my invention as constructed for such specific purpose.

It is the prevailing practice when either a slush pump piston or a piston rod becomes worn or defective to dislodge the piston from the piston rod by using a sledge hammer or similar impact means. This practice is inemcient because the force of impact is not uniformly distributed, and it is further undesirable because the impacts cause local damage to either the piston or the piston rod.

The general object of my'invention is to provide a device capable of separating a piston from a complementary piston rod-in an expeditious,

eflicient manner with minimum labor and without damage to either the piston or the piston rod. Another object of my invention is to provide a device capable of rapid manipulation and operation by a single operator.

A further object of my invention is to design a device to employ impacts for jarring apart a ,pistonand piston rod without acting directly on either the piston or the piston rod. A more specific object is to provide a device in which the concentrated force of an impact from a sledge hammer or similar device is distributed in a uniform manner to the piston and piston rod. A

further specific object is to incorporate in such a device an impact-driven wedge having faces inclined for irreversible action against a piston and piston rod.

Broadly described, my invention comprises a frame adapted to engage a piston member from one direction and to engage a rod member from the other direction in combination with wedge means operative between the members to cause relative movement of the two members. 7 s

With special reference to the frame employed, one of my objects is to provide an articulated frame that may be opened to receive work and readily closed to aneffective operating position;

and another of my objects is to provide a frame adapted to stand on a floor in inclined disposition so that when one end of a piston rod is supported by the frame, the other end of the piston rod the frame and one of may rest on the floor or on a block or other means on the floorvspaced at a distance from the frame.

Other objects and advantages of my invention will be apparent in the detailed description to follow.

In the drawings:

Fig. 1 is a side elevation of my invention partly in section showing a piston and piston rod engaged by the device;

Fig. 2 is an end elevation taken as indicated by the arrow 2 of Fig. 1;

Fig. 3 is a top plan view of the device in the disposition shown in Fig. 1;

Fig. 4 is an end view of an end portion of the device taken as indicated by the arrow 4 of Fig. 1; and

Fig. 5 is a transverse section through one of the members of the device taken as indicated by the line 5--5 of Fig. 3.

Figs. 1 and 3 show a piston body 9 having a metal core l0 mounted on a tapered portion H of a piston rod [2. My invention includes a frame comprising a crosspiece l4 adapted to exert force against the piston rod l2, a crosspiece I5 adapted to exert force against the piston body 9, and suitable means, such as a pair of links I6, interconnecting the two crosspieces. The frame is provided with means for adjusting the engagement of the frame with the piston body and rod and is also provided with wedge means for causing the desired relative movement between the piston body and the rod. In the preferred form of my invention shown in the drawings, the adjustable means is associated with the crosspiece l4 and the wedge means is associated with the crosspiece l5, but it will be understood by those skilled in the art that other arrangements are within the scope of my conception.

The'crosspiece I5 is integral with a pedestal l1 and a base l8 that are provided as suitable means for supporting the whole frame. It will be noticed that in the preferred form of my invention this pedestal is inclined at an angle so that while the frame is supporting one end of the piston rod l2, the opposite end of the rod (not shown) may rest upon the floor or ground at a point spaced from the frame. The crosspiece 15 has a rear wall [9, side walls 20 and 2|, and a forward wall 22, the walls forming a well 23 to receive a suitable wedge member 25. The rear wall I9 is provided with a suitable aperture 21 to receive the piston rod I2, and the forward wall 22 has a somewhat larger circular aperture 28 to slidingly receive the forward cylindrical end 29 of a ram generally designated 30.

The ram 30 has a rear wall 3I for cooperation with the wedge member 25, the rear wall being provided with a suitable aperture 32 to receive the piston rod I2. It is apparent .that the ram may be considered as a part of the crosspiece I5, the crosspiece being regarded as expansile by the action of the wedge member 25 between the rear wall [9 of the crosspiece and the rear wall 3| of the ram.

As best shown in Fig. 2, the wedge member 25 is provided with an elongated aperture or slot 35 dimensioned to clear the piston rod I 2. On each side of the slot 35 he two tapered portions 36 interconnected at their lower ends by a web 31 and at their upper ends by a web 38. In the particular arrangement shown, the rear faces '46 of the tapered portions 36 and the coacting face 33 of the rear wall I9 of the crosspiece are substantially perpendicular to the axis of the piston rod I2, and the forward faces 4| of the tapered portions 36 of the web, together with the rearward face 31 of the ram 31' are inclined with're'spect to the rearward faces '49 of the tapered portions, but it will be recognized that this arrangement is merely representative of a number of angular relationships between the various faces to achieve the desired wedging action.

To insure insertion of the wedge member 25 into the well 23 in proper disposition with respect to the various coacting faces, I'may provide a laterally projecting lug 42 on the lower end of the wedge member and an overhanging lip 43 at the top of the side wall 20 of the crosspiece so that the wedge member may be inserted in the well only when canted to pass the lug 42 under the lip 43. In the preferred form of my invention, I providea cap screw 45 threaded through a boss 46 in the side wall 20 of the crosspiece, the screw normally extending into the well '23 a sufficient distance to intercept the lug 42 and thereby act as a stop means to'limit the upward movement of the wedge member.

At the top 'of the wedge member, I provide integral with the web "38 an impact head 4? and a stop means to limit the downward movement 'of the wedge member, which-means may include a shoulder '48 positioned to move against the side wall 2| of the crosspiece and a second shoulder '49 adapted tomove against the lip 43. The ram 'is limited in'its movement away from the wedge member by the forward wall 22 of the crosspiece, which thereby acts as a stop means to restrain the lateral movement of the wedge member. When the wedge member is thus restrained, but not otherwise, the cap screw 45 is in vertical engaging-alignment withthe lug 42, and will .prevent removal of the wedge member from the crosspiece. Thus, if .the ram is first inserted in the crosspiece and the wedge member is thereafter inserted and the cap screw 45 turned inwardly, the several parts are locked in assembled relationship and cannot become mislaid or lost.

Each end of the crosspiece I 5 provides a pair of wings 5D spaced to define a laterally extending slot 5I dimensioned to receive one of the links IS, the link being normally retained in the slot by a suitable pin 54 that passes through the two wings. Longitudinal movement of each link forward through the corresponding slot is limited by a pair of laterally extending lugs 55 on the rear .end of each link, the rear edges of the Wings 55 being, by preference, recessed as shown at '56 to provide seats for "the lugs. It is apparent that,

in eifect, the links I6 are hinged to the crosspiece I 5, since the slots 5| and the pins 54 are arranged to permit considerable lateral play for the links.

The forward crosspiece I4 has a central tubular portion 58 and at its opposite ends pairs of wings 59 forming slots 60 to receive the forward ends of the links I6, the links being retained in the slots by suitable pins BI as before described. The forward nds of the links I6 have pairs of laterally extending lugs 62 that seat in recesses '63 in the wings 59 providing substantially the same relationship between the links and the forward crosspiece M as between the links and the rearward crosspiece I5. Since it is contemplated that the frame may be opened by removing one of the pins 6| and disengaging the crosspiece I4 from one of the links I 6, I may provide a chain 64 for one of the pins 6|. To limit the rearward movement of the crosspiece I4 with respect to the link I6 when thefram-e is open, the'lin-ksmay be provided with stop-lugs {5 5 dimensioned to cooperate with'th'e wings 59. To provide strength with economy of materiaL'the crosspiece I4 may be formed with pairs of ribs 65 extendingbetwee'n the tubular portion 58 and each of the pairs of wings 59.

For the purpose of providing adjustable engagement of the crosspiece I 4 with the "end of the piston rod I 2, the'tubul'ar portion 5430f the crosspiece is provided with threads to receive a screw member 68 having a-cup-s'haped pressurehead 69. A suitable bar T0 maybe mounteddiametrically in the outerend of the screw member I58 to serve as ahandlefor manual rotation 'of 'the screw.

The manner in which my device 'may b'e operated to dislodge a piston body from a piston rod may be readily understood from the foregoing description. Work is inserted in the device when the frame is in openpo'sition, for example, the position indicated'by dotted'lines in Fig. 3. The long end-of the piston rod is passed through the aperture 32 of the ram '30, the "slot 35 of the wedge member 25, and the aperture 21 in the rear wall of the crosspiece 15, and th'e piston rod is moved longitudinally until the piston body '9 abuts the forward end of the ram 30. In "this position, it is contemplated that the lower end of the piston rod will resteither upon the floor or ground or upon some'obje'ct, such 'as aiblock. The frame is then closed, the screw '68 being manipulated by means of the handle 10, it required, to p-ermitsuch closing-action.

The operator then holds the wedge member '25 at an elevated position with one hand, while he turns the screw-68 by means of the handle 'Ill to bring the'p'ressure-head into-abutment with the end of the pisto'n ro'd -I2, the'position-of the parts then being as shown in full lines -in Fig.1. It is necessary to tighten the screw member. only to a sufficient extent to hold the piston *hea'd firmly against the -ram 30, preferably with sulficient pressure to take u any slack in the assembly between the ram and the pressure-head. After the device is assembled in thismannerin operative relation to the work, the wedge member 25 is driven downwardly by sharp blows with a suitable sledge hammer, ea'ch blow of the hammer causing a jarring effect'tha't transmitted parallel to the axis'of the piston rod, the force being evenly'distributed' on one hand around th'e metal core Ill-of the piston body, and=being-evenly distributedon the other handover "the end of the piston rod I2.

It will be noted that the'wedge member is tapered at a relatively low, angle that magnifies the force transmitted to the ram 30 and prevents the operation from being reversible, i. e., prevents backward pressure of the ram from'caus- 'ing the wedge member to creep upwardly. Usually the piston is dislodged before the wedge member is driven to its lower limit the first time; if not, the operator loosens the screw 68 sufficiently to free the wedge member, then lifts the wedge member to its uppermost position, tightens the screw, and repeats the wedging action.

For the purpose of disclosure and to illustrate the principles involved, I have described the preferred form of my invention in specific detail. The particular form chosen for illustration will suggest to those skilled in the art various changes and modifications Without departing from the spirit of my conception. I reserve the right to all such changes and modifications that properly come Within the scope of my appended claims.

I claim as my invention: 7

1. In a device for dislodging a piston or the like from a piston rod or the like, the combination of: a crosspiece having a normally disposed through opening of a size sufficient to receive such a rod, and having lateral extensions providing a span across said crosspiece greater than the diameter of said piston and having a surface transverse the axis of said opening; an annular ram member having a bore of suificient size to receive said rod and slidably mounted on said crosspiece in axial alignment with said opening in a manner to be movable in a direction parallel to the axis of said opening, and provided with an annular seat of a diameter to engage the end of said piston and a surface facing toward and inclined at a small angle to said surface of said crosspiece; a bifurcated Wedge element seated in said crosspiece in a position substantially perpendicular to and straddling the axis of said opening, each of the forks of said wedge element being disposed between and in operative wedge-like engagement with said surfaces on said crosspiece and said ram member to force said ram member outwardly from said crosspiece; longitudinally elongatable means provided with a face suitable for end thrust engagement with the end of said rod adjacent the end of said piston remote from said crosspiece and with lateral extensions providing a span to said means greater than the diameter of said piston; and tie rods substantially longer than said piston, said rods being disengageably secured at their one ends to the extensions respectively of said crosspiece, and at their other ends to said extensions respectively of said elongatable engagement means.

2. In a device for dislodging a piston or the like from a piston rod or'the like, the combination of: a crosspiece having a normally disposed through opening of a diameter large enough to receive said rod, said crosspiece having lateral extensions providing a span across said crosspiece greater than the diameter of said piston and having a guideway parallel to the axis of said opening and formed with guides substantially perpendicular to said axis and having a surface transverse to the axis of said opening; a

ram element slidably mounted in said guideway on said crosspiece on one side of said opening with its direction ofmovement in said guideway parallel to the axis of said opening and provided with an annular seat of a diameter to engage the end of said piston and a surface facing toward and inclined at a small angle to said surface of said crosspiece; a bifurcated wedge element slidablyseated along its outside edge in said guides on said crosspiece in a position substantially perpendicular to and straddling the axis of said opening, each of the forks of said wedge element being disposed between and with their wedge 'fac'es inoperative slidable wedge-like engagement with said surfaces on said crosspiece and said ram element, the direction of sliding movement of said wedge element being substantially perpendicular to said axis; stop means preventing the sliding movement of said wedge means to a position in which said wedge means is out of engaging alignment with said ram element, said stop means being operable within given limits of lateral movement of said Wedge means; stop means limiting the movement of said ram element in its guideway away from said wedge means to positions in which said ram element laterally restrains said Wedge means within said given limits, one of said stop means being removable; longitudinally elongatable means provided with a face suitable for endthrust engagement with the end of said rod adjacent the end of said piston remote from said crosspiece, and further provided'with lateral extensions giving a span to said means greater than the diameter or said piston; and tie rods substantially longer than said piston, said rods being disengageably secured at their one ends to said extensions respectively of said crosspiece, and at their other ends to said extensions respectively of said elongatable engagement means; and releasable means for locking said tie rods against disengagement.

3. Ina device for dislodging a piston or the like from-a piston rod-or the like, the combination of: a first crosspiece having a span greater than the diameter of the piston; a second crosspiece having a'span' greater'than the diameter of the piston; a first contact means mounted on saidfirst crosspiece suitable for end thrust engagement with a piston rod end; a second contact means mounted on said second crosspiece suitable for end thrust engagement with said piston; threaded mounting means for said first contact means arranged with its axis normal to the span of the associated first crosspiece; wedge means operatively disposed between said second contact means and said second crosspiece; and

a pair of tie links connected to the outer end of" said crosspieces and forming therewith a substantially rectangular device, with said contact means axially aligned and facing inwardly of said device, each end of each crosspiece being bifurcated to longitudinally slidably receive one of said links, eachlink being formed with two diametrically opposite lugs at each of its ends,

each pair of said lugs having a span greater than the width of the slot between the associated crosspiece forks, and each fork being notched on its outside edge to receive one of said lugs.

4. In a device for dislodging a piston or the like from a piston rod or the like, the combination of: a first crosspiece having a span greater than the diameter of the piston; a second crosspiece having a span greater than the diameter of "the piston; a first contact means mounted on said first crosspiece suitable for end thrust engagement with a piston rod end; a second contact means mounted on said second crosspiece suitable for end thrust engagement with said piston; threaded mounting means for said first contact means arranged with its axis normal to the span of the associated first crosspiece; wedge means operatively disposed between said second contact means and said second crosspiece; a pair of tie links connected to the outer ends of said crosspieces and forming therewith a substantially rectangular device, with the said contact means axially aligned and facing inwardly of said device, each end of each crosspiece being bifurcated to longitudinally slidably receive-one of said links, each link being formed with two diametrically opposite lugs at each of its ends, each pair-of said lugs having a span greater than the width of the slot between the associated crosspiece forks, and eachfork being notched on -itsoutside edge to receive one of said lugs; and a removable means across the forks of each end -of each of said crosspieces forretaining said link laterally in position between said forks.

'5. In a device for dislodging a piston or the like from piston rod or the like, the combination f: a first crosspiece having a span'greater than the diameter of the piston; a second crosspiece having a span greater than the diameter of the piston; a first contact means mounted on said :first crosspiece suitable for end thrust engagement with a piston rod end; a second contact means mounted on said second crosspiece suitable for end thrust engagement with said piston; threaded mountin means forsaid first contact means arranged with its axis normal to the span of the associated first crosspiece; wedge means operatively disposed between said second contact means and said second crosspiece; a

@pair of tie links connected to the outer ends of said crosspieces and forming therewith a substantially rectangular device, with the said contact means axially aligned and facing inwardly of said device, each end of eachcrosspiece being bifurcated to longitudinally slidably receive one of said links, each link being formed with two diametrically opposite lugs at each of its ends, eachpair of said lugs having a span greater than the width of the slot between the associated crosspiece forks, and each fork being notched on its outside edge to receive one of said lugs;

and a removablemeans across the forks of each end of each of saidcrosspieces for retaining said link laterally in position between said forks; and

a lug on each of said links intermediate the ends thereof, and projecting laterally therefrom sufliciently to engage the forked ends of either crossaspan greater than the diameter of the piston and having at each of its outer ends a guideway normal to-the direction of said span; a first contact means mounted on said first crosspiece suitable for end thrust engagement with a piston rod end; a second contact means mounted on said second crosspiece suitable for end thrust engagement with said piston in the opposite direction from said first end thrust engagement; threaded mounting means for said first con-- 'tact means arranged with its axis normal to the span of the associated first crosspiece; wedge means operatively disposed between said second contact means and said second crosspiece;

and a pair of tie links each longitudinally slidably seated at each end in a said guideway of the associated outer end of one of said crosspieces and said links forming with said crosspieces a substantially rectangular device enclosbearing contact with each other, for pivotal movement of the associated tie link about the point of said bearing contact.

7. In -a device for dislodging a piston or the like from a piston rod or the like, the combination of: a first crosspiece having a span greater than the diameter of the piston and having at each of its outer ends an open-sided guideway normal to the direction of said span; a second crosspiece having a span greater than the diameter of thepiston and having at each of its outer ends an open-sided guideway normal to the direction-ofsaid span; a first contact means mounted on said first'crosspiece suitable for end thrust-engagement with a piston rod end; a second contactmeans mounted on said second crosspiece suitable for end thrust engagement with said :piston in the opposite direction from said first-end thrust engagement; threaded mounting means for said firstcontact means arranged with its axis normal to thespan of the associated first crosspiece; wedge means operatively disposed between said second contact means and said second crosspiece; a pair of tie links each longitudinally slidably seated at each end in a said 'guideway of the associated outer end of one of said crosspieces and disengageable from said guideway-by a transverse movement through ;the said'openside of said guideway, and said links forming with said crosspieces a substantially rectangular device enclosing said piston with the -first andsecond contact means axially aligned and facing inwardly of said device toward said piston, each of said crosspieces having a bearing surface at each outer end facing away from the other of said crosspieces and disposed at the end of the associated guideway remote from said other crosspiece, and each of said tie links having at each end a bearing surface facing the bearing surface on the adjacent outer end-of the adjacent crosspiece, each pair of said facing be'aringsurfaces being shaped to provide, when held in bearing contact with each other, for pivotal movement of the associated tie link about the point of said bearing contact; and

releasable means for each end of each of said crosspieces for closing said open side of said associated guideway and thereby holding the associated link end in its longitudinally slidably seated-relationship with the associated guideway.

' CLARENCE WHITE.

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