US2161013A - Pipe jack - Google Patents

Description

June 6, 1939'.

P. BREZ A PIPE JACK Filed Feb. 28, 1938 T s Sheets-Sheet 1 A iiorneys June 6, 1939. BREZA 2,161,013

PIPE JACK Filed Feb. 28, 1958 I 3 Sheets-Sheet 2" Inventor i aa/ LE/"ez a A iior neys June 6, 1939.

P. BREZA PIPE JACK Filed Feb. 28, 1958 3 Sheets-Sheet 3 A itrheys r rib,8 of the l atented June 6 193 U N ITED PATENT oFFrcs PIPE. JACK Paul Breza, Chesapeake City, Md.

Application February 28, 1938, Serial No. 193,202 12 Claims. (0]. 25;4-29) The present invention relates to pipe jacks designed primarily for use upon dredging pipes of relatively large diameter which are usually connected together in telescoping arrangement, the principal object of the invention residing in the provision of a portable fluid pressure operated jack unit adapted to engage thepipes to separate the same.

A further important object is .toprovidea jack unit embodying a pair of longitudinally alined cylinders and a confined fluid for operating pistons in the cylinders and to which the jaws of the jack are secured and a pair of manually ,op- .erated pumps provided with a single operating lever to force the fluid under pressure to the cylinders, together with valve means controlling the fluid.

Another object is to provide a support for mounting a pair-of the jacks at QDpOsitesides of the pipe.

A still further object is to provide an .apparatus of this character of simple and practical construction, which is strong and durable,.efficient in performance, andotherwise well adapted for the purposes for which the same is intended.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which Figure 1 is a top plan .view with-partsbroken away and shown in section.

Figure 2 is a transverse sectional view through the pipe showing the pair .of jack unitsin end elevation.

Figure 3 is a front elevational View of the casting .for the pumps and fluid ducts.

Figure 4 is an end elevational view thereof with parts shown in section.

Figure 5 is a longitudinal sectional View through one of the jack cylinders, and

Figure dis a sectional view through oneofthe pumps.

Referring now to the drawings indetail, the numerals 5 and 6 designate a pair of ,telescopically connected pipes, eachof the .pipes having annular ribs 1 and 8 respectively adjacentitheir ends,.the end of the female ,pipe 5 abutting the male pipe 6 to limit inwardmovementor the latter.

The pipe .jack comprises .apair of longitudinally alined cylinders Brand 10 connected atgtheir inner ends by a lateral casting H, the cylinders being of identical construction andaccordingly adetailed description of one-will suffice for both. Each cylinder is provided with a piston I2 having a working fit therein and to theend of the piston is secured a leather washer l;3. A stem M extends from the piston outwardly through a .plug 15 threaded in the outer end of the cylinlder, .a shoulder It being formed .on the stem abutting the inner face of the end wall .11 of a sleeve l8 slidably mounted on the cylinder. The stemextends throughan opening in the end wall 1 J1 and ;,is anchored to .the sleeve by a nut 19 Lthreaded ontheouter end of the stem.

A jaw 20 projects laterally from one .sideof the sleeve at its inner end and an internal lug 2! is formed in the sleeve sliding in a longitudinal groove122in the outer surface of the cylinder to prevent rotation of the sleeve on the cylinder. As shown in Figure 1 the jaws 28-20 of the respective cylinders are adapted to be placed betweenthe ribs] and-8 in a mannerto spread the ribs apart whereby toseparate the pipes.

A reservoir-23 is provided with a pipe .21! .inrits bottom which supports the reservoir .in an upright position above the'casting a, the lower. end

.of the pipe. communicating with a pair of vertical -ducts; 25-.2,5 in the casting,the lower endsof the ductsdivering toward the ioppositesides of the casting and terminating in angularly extending .ducts 26 leading toward the frontof the casting (see Figures 3 and 4). cate ,withthebottom of a pair of vertical pump cylinders 2'I- 2;'| havingpistons working therein, ,each of said pistonscomprising a sleeve .28 havingaworking-fit in the cylinder and a pump rod 129 havi W k n and rod being coextensive and the sleeve being :free-irom the rod. Both the sleeve .androd of .each piston extend outwardly from the top of .the cast-mg through apacking nut 38 the top of ieachrrodhaving a head 3| from the under side L of W iCh-,-depends a projection 32 having an inturned flange 33.

'The upperend of thesleeve is provided with a alug Manda manipulating handle .35 by means pf .whichthesleeve may be rotated to-rnove the lug into and out. of positionoverlying the flange 533-120 secure the -sleeve to therod forreciprocation asaunit. Aplatetfi is secured to theplug 1.! by a nut .;3-.'|,-,the p1ate being spaced abovethe castingandalso above the packing nut and under .which the lug 3.4 is adaptedto be moved *whenthe sleeveisedetached from-therodto lock thesleeveagainstmovement. As will beapparent. trom -aninspection of Figure 3 the opposite ends of the; plate .36 serve as a lockingmeans The ducts ,26 communiu fit-in the sleeve, the sleeve for the sleeves of the respective pumps. Accordingly the sleeve, when secured to the rod, provides a pump piston of increased diameter to produce an increased pressure during operation of the piston.

A pin 32' projects forwardly of each of the heads 32 on which is pivoted the upper end of links 3B38, the lower ends of said links being pivoted to pins 339 on a connecting member 49, said member being pivoted at its central portion on a hollow plug 4! threaded in the front of the casting. An operating handle 42 extends upwardly from the member 4%], the center line of the handle passing through the axis of the plug M from which it will be apparent that the oscillating movement of the handle from side to side will cause an opposite operation of the pump piston.

Ball check valves 43 are yieldably maintained in closed position in the intake ducts 26 by springs 44 and discharge ducts 45-45 lead from each of the cylinders 21 to a common chamber 46 in which a coil spring 4'! is arranged for yieldably maintaining a pair of ball check valves 48- 48 in closed position in the respective discharge ducts. From the chamber 45 a duct 49 extends rearwardly of the casting to a pair of lateral ducts 5il50 communicating with the respective jack cylinders 9. A two-way rotary control valve 5| is mounted at the junction of the ducts 49 and 50 to selectively control communication to either or both of the jack cylinders, or to cut off both cylinders, said valve being operated through the bottom of the casting by a handle 52.

A fluid return passage 53 for the jack cylinders extends upwardly from the chamber 46 in which a needle valve 54 is arranged extending outwardly through the plug 4! and provided at its outer end with a handle 42.

To the outer end of each of the sleeves I8 is attached one end of a coil spring 55 the opposite end of the spring being connected to a plate 56 secured to the casting, the spring serving to yieldably urge the sleeves inwardly.

As illustrated in Figures 1 and 2, a pair of the jack units are employed for separating the pipes 5 and 6 in order to prevent binding of the pipes during separation, and for the purpose of supporting the pair of jacks at opposite sides of the pipe an arm 51 is secured at one end to each jack unit as at 58, the arms extending transversely above and resting on the pipe in crossed relation and pivotally connected to each other intermediate their ends at 59. The free ends of the arms are provided with longitudinally spaced openings 50 in which stems 5| of brackets 52 are adjustably secured, the brackets being in the form of eyes through one of which one end of a bolt 63 is threaded, the other bracket being open at one site as at 6 5, in which the opposite end of the bolt is seated, a coil spring 65 being interposed between the head 56 of the bolt and the adjacent bracket to yieldably urge the handle ends of the arms toward each other and thus secure the arms and jack units in a predetermined fixed relative position on the pipe.

The numerals 5'5, 58, B8 and 10 and H designate plugs threaded in the openings in the casting provided for drilling the several ducts, the inner end of the plug 51 being hollow and provided with a valve seat 12 for the valve 48.

In the operation of the device, the jack units are mounted upon the pipe in straddled position as shown, the valve 54 being closed and the valve 51 being opened to either or both of the jack cylinders as desired. The pump handles 42 of the respective jacks are then manipulated causing the pumps 28 upon their upstroke, to open the check valves 43 drawing the fluid from the reservoirs into the cylinders 27 and upon their downstroke closing the valves 43 and opening the valves 48 to force the fluid into the chamber 46 and through the ducts 49, into the jack cylinders to cause an expansion of the sleeves i8, thus spreading the jaws 2B and resulting in the breaking loose and separation of the pipes 5 and 6. The valve 54 is then opened and the springs 55 will move the sleeves l8 inwardly forcing the fluid back through the duct 49, chamber 46 and duct 53, into the reservoir.

It is believed the details of construction and manner of operation of the device will be readily understood from the foregoing without further detailed explanation.

Having thus described the invention, what I l claim isl. A pipe jack comprising a pair of jaws arranged for opposite movement and adapted to engage a pair of pipe sections, fluid pressure means for expanding the jaws, spring means for contracting the jaws and valves selectively controlling the fluid pressure during the expanding and contracting movement of the jaws.

2. A pipe jack comprising a pair of jaws arranged for opposite movement and adapted to engage a pair of pipe sections, a jack cylinder for each of the jaws, pistons working in the cylinders said jaws projecting laterally at one side of the respective cylinders and rigidly connected to the pistons, a confined fluid, means for forcing the fluid into the cylinders to expand the jaws, spring means for contracting the jaws and valve means controlling the fluid during the expanding and contracting movement of the jaws.

3. A portable pipe jack comprising a pair of jaws arranged for opposite movement and adapted to engage a pair of pipe sections, a jack cylinder for each of the jaws, pistons working in the cylinders said jaws projecting laterally at one side of the respective cylinders and rigidly connected to the pistons, a confined fluid, a pump for forcing the fluid into the cylinders to expand the jaws, check valves maintaining the pressure in the cylinders, a valve adapted to release the pressure and spring means for contracting the jaws upon the opening of said last named valve.

4. A portable pipe jack comprising a casting, a pair of longitudinally alined cylinders, pressure responsive pistons working therein, jaws fixed to the pistons for expanding movement and projecting laterally from the cylinders, a confined fluid, a reservoir, ducts in the casting leading from the reservoir to the cylinders, a pump carried by the casting for forcing fluid from the reservoir to the cylinders, check valves in the ducts for maintaining pressure in the cylinders, a release valve controlling return of fluid from the cylinders to the reservoir and spring means for contracting the jaws.

5. A portable pipe jack comprising a casting, a pair of longitudinally alined cylinders, pistons working therein, jaws fixed to the pistons for expanding movement and projecting laterally from the cylinders, a confined fluid, a reservoir, ducts in the casting leading from the reservoir to the cylinders, a manually operable pump mounted in the casting for forcing fluid from the reservoir to the cylinders, check valves in the ducts for maintaining pressure in the cylinders, a release valve controlling return of fluid from the cylinder to the reservoir and spring means for contracting the jaws.

6. A pipe jack comprising a casting, a pair of longitudinally alined cylinders having pistons working therein, a fluid intake port leading from the casting to the inner ends of the cylinders, sleeves slidable on the cylinders, jaws on the inner ends of the sleeves, means rigidly connecting the outer ends of the sleeves to the pistons, a reservoir, ducts in the casting connecting the reservoir with the intake port and a manually operable pump for forcing fluid from the reservoir to said cylinders.

7. A pipe jack comprising a casting, a pair of longitudinally alined cylinders having pistons working therein, a fluid intake port leading from the casting to the inner ends of the cylinders, sleeves slidable on the cylinders, jaws on the inner ends of the sleeves, means rigidly connecting the outer ends of the sleeves to the pistons, a reservoir, ducts in the casting connecting the reservoir with the intake port, a pair of pumps for forcing fluid from the reservoir to said cylinders, an operating lever for the pumps and means operatively connecting the lever to the pumps for opposite actuation.

8. A portablepipe jack comprising a plurality of jack units embodying pipe engaging and separating members and arms carried by the units and. connected in crossed relation above the pipe for supporting the units at opposite sides of the pipe.

9. A portable pipe jack comprising a plurality of jack units embodying pipe engaging and separating members and arms carried by the units and connected in crossed relation above the pipe for supporting the units at opposite sides of the pipe, and means for adjusting the crossed ends of the arms relative to each other.

10. A portable pipe jack comprising a plurality of jack units embodying pipe engaging and separating members, arms carried by the units and extending in crossed relation above and resting on the pipe, means pivotally connecting the crossed ends of the arms and means yieldably urging the members into pipe engaging position at opposite sides of the pipe.

11. A pipe jack comprising a pump casing having a pump mounted therein, a pair of cylinders projecting from opposite sides of the casing, pistons working in the cylinders and having pipe engaging members rigidly connected thereto, a duct leading from the pump to the inner ends of the cylinders and valve means in said duct.

12. A pipe jack comprising a pump casing having a pump mounted therein, a pair of cylinders projecting fromopposite sides of the casing, pistons working in the cylinders and having pipe engaging members rigidly connected thereto, a reservoir for a confined fluid connected to the pump, ducts in the casing leading from the pump to the inner ends of the cylinders and from the cylinders to the reservoir and valve means selectively controlling communication through said ducts.

' PAUL BREZA.

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