US3305919A - Pulling tool - Google Patents

Description

PULLING TOOL Filed April 23, 1965 56 INVENTOR.

6 v LESL/E c. P/EECEI United States Patent Ofifice Patented Feb. 28, 1967 3,305,919 PULLING TOOL Leslie C. Pierce, 2816 NW. 58th St., Oklahoma City, Okla. 73112 Filed Apr. 23, 1965, Ser. No. 450,296 7 Claims. (Cl. 29-213) This invention relates to a pulling tool, especially but not exclusively adapted for pulling the valve cores of drill pipe float valves.

The primary object of the invention is the provision of an efficient, more easily used device of the kind indicated, which is readily adjustable for application to drill pipe collars, and the like, of differing diameters, from which valve cores are to be extracted or pulled, without distortion and damage thereto.

In the drawings:

FIGURE 1 is a fragmentary diametrical section taken through a drill pipe float valve assembly, showing a device of the invention applied to the valve core and to the collar thereof;

FIGURE 2 is a bottom plan view of FIGURE 1;

FIGURE 3 is a fragmentary section, taken at right angles to FIGURE 1; and

FIGURE 4 is an enlarged perspective view of one of the adjustable drill type collar engaging members.

Referring in detail to the drawings, a drill pipe float valve assembly A is shown, which comprises a tubular housing or collar 10, formed with a counterbore 12, opening to an end 14 of the housing, and defining a shoulder 16, at the end of the counterbore, remote from the end 14. A tapered threaded socket 17 opens into the counterbore 12 from the collar end 14.

Force fitted into the counterbore 12 is a valve core 18 comprising a tubular sleeve 20, which extends from the socket 17 to a point spaced from the counterbore shoulder 16, and confines in the-counterbore, between the sleeve and the shoulder 16, a valve seat 22.

The sleeve is formed intermediate its ends, with a cross member 24, here shown as being of vertically disposed oblong cross section. A valve stem 26 works in a hub 28, centered on the cross member 24 and carries a valve 30, a coil spring 32 being circumposed on the valve stem 26 and compressed between the hub 28 and the valve 30, for yieldably seating the valve in the valve seat 22.

In order to gain access to the valve seat 22 and/ or the valve 30, for inspection or replacement thereof, it is necessary to apply a heavy pull to the sleeve cross member 24, so as to withdraw the valve core sleeve 20 from the collar counterbore 12. Such withdrawal can be accomplished in different ways and by the use of existing pulling tools or extractors, the use of which, however, can be attended by binding of the core sleeve 20 in the counterbore 12, and difficulty in the removal thereof, as well as by damage to the parts, especially where collars of differing diameters, and core sleeves 20 of different diameters are involved.

In accordance with the present invention, these difiiculties, and others, are eliminated by the use of a pulling tool or extractor 34, The tool 34 comprises a pair of similar and opposed rectangular arcuate cross section collar engagers 36, having flat straight leading edges 38, adapted to engage diametrically opposed areas of the outer end 14. The trailing edges 40 of the engagers 36 are centrally formed with transversely elongated slots 42, having straight edges 44, spaced from the trailing edges 40, the material of the engagers being formed to provide short transversely spaced, inwardly extending lugs 46, whose flat inner surfaces 48 face, and are paral lel to the slot edges 44, so as to provide slideways 50.

The slideways 50 slidably and adjustably receive spaced portions of a transversely elongated, preferably flat pressure bar 52, the pressure bar being longer than the maximum diameters of collars 10 contemplated. As indicated in FIGURES 1 and 2, the engagers 36 are adjusted, on the pressure bar 52, to positions wherein their leading edges 38 engage the end 14 of the collar 10.

The pressure bar 52 is provided with a central smooth opening 54, slightly larger in diameter than an extracting screw 56, which extends therethrough. The opening 54 is axially aligned with an annular tapered recess 58, formed in the outerside, of the pressure bar 52, in which is engaged the conformably tapered end 60 of a nut 62. The nut 62 has a threaded bore 64 through which the screw 56 is threaded. Diametrically opposed lateral handle members 66 are provided on the nut 62.

The screw 56 has suitably secured, on its inner end, a polygonal cross section cross bar 68 which extends to opposite sides thereof, and is rotatable on the screw. Elongated hooks 70, reversed with respect to each other, comprise generally rectangular outer end portions 72, which are formed with centered polygonal openings 74, which slidably and non-rotatably receive the cross bar 68, at opposite sides of the screw 56, and are adjustable along the cross bar. Straight offset shanks 76 extend from the end portions 72, which terminate in curved crooks 78. As shown in FIGURES 1 and 3, the crooks 78 are adapted to be engaged over the related portions of the valve core sleeves cross member 24, at opposite sides of the valve stem 26, with the crooks 78 reversed with respect to each other, so as to distribute pull on the cross member evenly, and to avoid lateral stresses on the valve core, as the same is being extracted.

In operation, the handle members 66 are utilized to rotate the nut 62, in a direction to move the screw outwardly relative to the collar 10, and thereby pull the core sleeve 20, accompanied the valve stem 26 and the valve 30, out of the counterbore 12, and out through the end 14 of the collar, far enough to enable the hooks 70 to be disengaged from the cross member, and the tool to be removed from the collar 10, whereat the core 18 is available to be easily withdrawn entirely out of the collar, by hand or by other suitable means.

What is claimed is:

1. In combination, a tubular collar having an end, said collar having a bore, a sleeve frictionally engaged in the bore, said sleeve having a fixed cross member extending thereacross, a pulling tool comprising a pair of diametrically opposed engagers having leading edges engaged with said end of the collar, said engagers having slideways extending therethrough, a pressure bar longer than the diameter of the collar, said slideways adjustably receiving the pressure bar, said pressure bar being centrally formed between the engagers with a smooth opening, a screw extending through said 0pening, an enlarged recess aligned with said opening and communicating therewith, a nut threaded on the screw and rotatably engaged in said recess, a rotatable cross bar fixed on an end of the screw and extending into said sleeve, and hooks being engaged on the cross bar at opposite sides of the screw and engaged over the sleeve cross member, and means for rotating the nut.

2. The combination of claim 1, wherein said cross bar is of polygonal cross section, said hooks having end portions formed with polygonal openings slidably and non rotatably receiving the cross bar, at opposite sides of the screw.

3. The combination of claim 1, wherein said cross bar is of polygonal cross section, said hooks having end portions formed with polygonal openings slidably and nonrotatably receiving the cross bar, at opposite sides of the screw, laterally and oppositely offset shanks on said hook end portions, said shanks extending along opposite sides of the cross bar, said shanks terminating in oppositely directed crooks engaged over the cross bar.

4. In combination, a drilling float valve comprising a tubular collar having an open end, a counterbore ex- E tending inwardly from said one end and defining a shoulder at the end of the counterbore remote from said one end, a valve core comprising a sleeve plug-fitted in said bore and having an inner end spaced from said shoulder, an annular valve seat engaged in said counterbore between said shoulder and the inner end of the sleeve,

bar being formed with a central smooth opening extending therethrough, the outer side of the pressure bar being i formed with an enlarged recess opening to said smooth -opening, a screw extending through said opening and into said counterbore, a nut engaged on the screwand rotatably sealed in said recess, a cross bar rotatably engaged on the inner end of the screw, reversed hooks on the cross bar at opposite sides of the hub, said hooks 1 being engaged over the sleeve cross member at opposite sides of the hub, and means for rotating the screw.

5. A pulling tool comprising a transverse pressure bar having slidably adjustable engagers on its opposite ends and extending laterally therefrom, said pressure bar being formed with a central smooth opening, the side of the pressure bar remote from the engagers being formed with an enlarged diameter recess aligned with said opening, a screw extending freely through the opening of the pressure bar, a nut threaded on the screw and rotatably engaged in said recess, the end of the screw remote from said nut carrying a rotatable cross bar, hooks slidably engaged on opposite ends of the cross bar, and means for rotating the nut.

6. A pulling tool according to claim 5, wherein said cross bar is of polygonal cross section, and said hooks have end portions formed with polygonal openings slidably and non-rotatably receiving the cross bar.

7. A pulling tool according to claim 5, wherein said cross bar is of polygonal cross section, and said hooks have end portions formed with polygonal openings slidably and non-rotatably receiving the cross bar oppositely, offset shanks extending from said hook end portions, and oppositely directed crooks on said shanks.

References Cited by the Examiner UNITED STATES PATENTS 5/1954 Lee 29259 7/1961 Baker 29259

Claims (1)

1. 5. A PULLING TOOL COMPRISING A TRANSVERSE PRESSURE BAR HAVING SLIDABLY ADJUSTABLE ENGAGERS ON ITS OPPOSITE ENDS AND EXTENDING LATERALLY THEREFROM, SAID PRESSURE BAR BEING FORMED WITH A CENTRAL SMOOTH OPENING, THE SIDE OF THE PRESSURE BAR REMOTE FROM THE ENGAGERS BEING FORMED WITH AN ENLARGED DIAMETER RECESS ALIGNED WITH SAID OPENING, A SCREW EXTENDING FREELY THROUGH THE OPENING OF THE PRESSURE BAR, A NUT THREADED ON THE SCREW AND ROTATABLY ENGAGED IN SAID RECESS, THE END OF THE SCREW REMOTE FROM SAID NUT CARRYING A ROTATABLE CROSS BAR, HOOKS SLIDABLY ENGAGED ON OPPOSITE ENDS OF THE CROSS BAR, AND MEANS FOR ROTATING THE NUT.

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