US914166A - Hydraulic-pressure-controlling means. - Google Patents

Description

J. W. NELSON.

HYDRAULIC PRESSURE CONTROLLING MEANS.

APPLICATION FILED Juno, 190a.

Patented Mar. 2, 1909.

2 SHEETS-SHEET 1.

IIVVENTOR ATTORNEY J. W. NEL$ON.

, HYDRAULIC PRESSURE GONTROLLING MEANS.

APPLICATION FILED JAN. 20, 190B.

Patented M21112, 1909.

2 SHEETS-SHEET 2.

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INVENTOR By 6 ATTORNEY asumornm, mm

UNTTE STES PATENT @FFTQE.

JAMES W. NELSON, OF NEW YORK, N. Y.

HYDRAULIC-PBESSURE-OONTROLLING MEANS.

Application filed January 20, 1908.

To all whom it may concern:

Be it known that 1, JAMES W. NELsoN, a citizen of the United States, and a resident of the city of New York, aorough of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Im rovements in Hydraulic-l ressure-Contro ling Means, of which the following is a specification.

This invention relates to means for controlling the generation and application of the pressure of hydraulic pumps, with particular reference to apparatus designed for the purpose of applying the pressure at a point at some distance from the location of the pump or the pressure generating mechanism.

In a co-pending application,flled January 20, 1998, Ser. No. 411,613, I have shown and described a pressure-controlling means of the same general character, but in that case the controlling device is adapted for use in connection with a pump of the single piston type.

The present invention contemplates the employment of a double or multiple piston pump, particularly adapted for use when it is desired to sacrifice power for speed in raising the ram or rams to contact with the work or load, after which all but one of said pumps are rendered inoperative in order that there may be rendered available the maximum power of which the device is capable.

In the co-pending application aforesaid, I stated that one of the more particular objects of locating the pump and pressure valves in a memher which is independently movable with respect to both ump and ram, was to provide for the emp oyment of two or more rams, operated by a single pump, and for the purposes of this description I have correspondingly shown the present invention as applied to a double or multiple pump, the pressure of which is intended to be equally applied at two different points.

My invention will be more readily understood by reference to the accompanying drawings forming a part of this specification in which Figure 1 is a diagrammatic view of the complete apparatus showing the pump and one of the rams in section; Fig. 2 is an enlarged partly sectional plan view of the Specification of Letters Patent.

Patented March 2, 1909.

Serial No. 411,612.

valve container, and Fig. 3 is a transverse section through the upper part of Fig. 2.

Referring now to the drawings in detail, numeral 11 refers to a pump cylinder having a central bore 12, the lower portion 13 of which is reduced in diameter. A piston rod 141 carries the larger piston 15, operating in the upper and larger portion 12 of the pump bore, and projecting from the head of the piston 15 is the rod 16 carrying the smaller piston 17 adapted to operate in the lower and smaller portion 13 of said pump bore. The piston rod 15 projects from the top of the cylinder 11, where it is preferably provided with suitable packing, and is pivoted to the lever 18 fulcrumed at 19 to the bracket 20 carried by the cylinder 11. The pistons 15 and 17 may be provided with suitable packing, although this feature is not shown in the drawings. From the chamber beneath the larger piston 15 leads a duct 21 to a coupling 22, by means of which said duct communicates with the pipe 23. A duct 24 similarly leads from the chamber below the smaller piston 17 through the coupling 25 to the pipe 26 The valve box or container comprises a preferably cylindrical body 27, of suitable metal, which is bored to provide a chamber 28 threaded for the reception of a screw-plug 29 which seals said chamber. From this chamber 28 leads the longitudinal valve bore 29, the other end of which is sealed by means of the screw-plug 30. The bore 29 is increased in diameter a short distance from the chamber 28 to provide a seat for the valve 31, which has a stem 32- extending upwardly and projecting into the chamber 28. In a similar manner, a seat is provided for the valve 33 which has a stem 34 which, when said valves are seated, extends nearly but not quite to the valve 31. For the purpose of again reducing the size of the bore, and for other reasons, I prefer to employ a removable cylindrical plug 35 to provide a seat for the valve 36, which has a stem 37 which, when said valves are seated, extends nearly but not quite to the valve 33. The valve 36 is referably spring-seated, as shown. This va ve member 27 is provided at one end with the branching arms 38 and 39, each of which is preferably screw threaded at its end for the reception of the couplings 40 and 4:1, respectively, which serve to connect the pipes 23 and 26 with these arms. The arm 39 is provided with the longitudinal duct 42 open to the interior of the pipe 26 and communicating, through the lateral duct 43, with that portion of the bore 29 between the valves 33 and 36. The arm 38 is similarly provided with a duct 44 which provides communication between the pipe 23 and that portion of the bore 29 between the valves 31 and 33. I have shown the other end of the member 27 similarly provided with a pair of branching arms 45 and 46, having longitudinal ducts 47 and 48, respectively, both of said ducts being open to the chamber 49 below the valve 36. These ducts 47 and 48 communicate, through the couplings 50 and 51, with the pipes 52 and 53, respectively. The pipe 52 leads through the coupling 54 and the plug 55 to the chamber 56 below the ram 57 in the ramcylinder 58. The pipe 53 leads in a similar manner to the pressure chamber underneath the ram 59 in the ram-cylinder 60, these ram members being identical in all material respects. The lug 29, sealing the chamber 28, is provide with the short shaft 61, carrying at its inner end the cam 62 located in cooperative positional relation to the upper end of the stem 32 of the valve 31. The other end of the shaft 61 is 'rovided with a head 63 which is preferably s otted for the reception of the bearing-portion 64 of the lever 65 pivoted in said head. it will now be apparent that by means of said lever 65 the shaft 61 may be rotated and the cam thereby operated, first, to impinge against thestem 32 of the ram 31 and positively unseat said valve without, however, interfering withautomatic operation of the valves 33 and 36 second, by continuing rotation of said shaft, to depress the stem 32 so that valve 31 impinges against the end of the stem 34 of the valve 33, thereby holding both of said valves off their seats without, however, interfering with automatic operation of the valve 36; or, third, rotation of said shaft may be con tinued until the cam has operated to successively unseat all of said valves and positively hold the same off their seats. The member 27 is further provided with a bore which leads from the chamber 28 laterally to the exterior of said member, said bore being preferably enlarged and screw-threaded within its outer end for the reception of the plug 66, which carries the cylindrical nipple 67 to which may be secured a rubber or other form of flexible tube or hose leading to any convenient source of liquid supply.

It will now be apparent that with the valve controlling lever 65 in the position. indicated in Fig. 2, and all of the valves, therefore, capable of performing their automatic functions, the Lip-stroke of the pump lever 13 will cause the formation of partial vacuums in the chambers below the piston 16 and 17. The thus-generated inequality of pressure will cause the liquid to flow from the source 33 and entering the duct 43 from whence itpasses into the ipe 26 and to the chamber below the smalli er piston Upon the down stroke of the pump-lever 18, the pressure from the larger piston, through the pipe 23,

closes the valve 31, and the liquid forced through said pipe passes the valve 33 and joins the liquid entering through the duct 42, from the smaller piston. The combined pressure unseats the valve 36 and the liquid is divided between the ducts 47 and 48, thence flowing to the ram or pressure chambers. In this manner, the greatest speed which the pump is capable of developing may be utilized, and when the ram. or rams have been raised to the point where they receive the full weight of the load, the valve controlling lever 65 may be operated to turn the shaft 61 and the cam-62 through an are sufficient to unieat the valve 31', in the manner hereinbefore described, and hold the same off its seat. It will now be apparent that while the upstroke of the pump-lever 18 will have the same effect as under the conditions heretofore described, upon the downstroke thereof, the valve 31 being now held off its seat, the liquid which flows through the duct 44, instead of unseating and passing the valve 33, will follow the path of least resistance and return past the open valve 31, through the upper portion of the bore 29 back to the chamber 28 and thence to the source of supply. Under these conditions, therefore, the liquid under pressure of the larger piston will flow idly back and forth between the larger pump chamber and the source of supply, and the smaller piston 17 alone is effectively operative, the liquid being forced thereby through the pipe 26 and the duct 42 into that portion of the bore 29 below the valve 33, and thence past the valve 36 to the pressure chamber or chambers.

It has been explained that one of the prime functions of this separate or individual valve container is to enable an operator near both of the rams (or near the ram, if but one is employed) and who is in position to note the progress and effect of the work being done,

to dependably control the generated pres-' sure tend to harden or temper copper hy turning the lever through an additional are, thus causing the cam 62 to further depress the valve-stem 32 until the valve 31 has contacted with the stem 34 and unseated the valve Under these conditions, although thepumping ope 'ation is continued, no liquid Will he forced past the valve inasmuch as the valves and 3 are both open and the path of the least resistance, from both ducts L2 and 4:41, is bani: into the chamber 28 and thence to the source of supply.

hen it is desired to relieve the pressures in the ram chambers, for the pose of lowering the rams for removal 0 I readjustment of the apparatus, the leverfisi is rotated through. a still greater are, whereby the cam 62 will operate through the stems 32 and to unseat the valve 36 and hold all. of said valves off their seats. in this manner an open passage is provided from each of the ram chambers bacl; to the source of simply, and the rams maybe readily ov ared, usually by their own Wei ht, for the purposes mentioned. The pipes 23, and 53 are preferably of copper and, therefore, su ciently flexible to enahle relative movement of any one of the thus-connected members '-.vitl.1 respect to another or others. In my co-pending application aforesaid, it is e):- plained that long continued periods of pres-- pipe and attention is directed to the fact that the pipes 23 and 26, which are, a rule, much longer than the pipes and the valve member 27 being intended immediate proxr nty to th 1 m or r: are only under pressure during the downstrolre cf the pumpprstons when the latter are effectively operative.

As hereinbefore sug.

ted, my invention may be equally satrsfactorily employed Where but one ram is necessary or desirable, and many other modifications of minor details of the apparatus illustrated will doubtless reauily suggest themselves to those sl-tillod in the art to i h t appertains. I therefore do not desir it 1y invention to the specific constru .tion herein shown and described.

I claim as new and desire to secure by having a common operating means for generating hydraulic pressures, means apart therefrom for selectively rendering effective one or all said pressures, and controlling the resultant pressure, and means for applyin said resultant pressure at a selective point.

4. In comlfrination, a plurality of means having the common operative means for generating hydraulic pressures, means apart therefrom for combining said pressures or rendering effective one thereof only and for controlling and distributing the resultant pressure, and means for simultaneously applying said resultant pressure at a plurality of selective points.

5. In combination, a multiple pump and means apart therefrom for applying the generated pressures, the pump and pressure valves heing located in an in dividually-movahle fitting.

6. In comliination, a double pump, and. means apart therefrom for applying the generated pressures, the pump and pressure valves heing located in an individually-movahle fitting.

7. In combination, a multiple pump, means apart therefrom for applying the generated pressures, the pump and pressure valves being located in a fitting which is individually movable and which is provided. with means for the control of said valves.

8. In combination, a multiple pump, means for applying the pressure generated thereby at a plurality of selective points, and means apart from both pump and pressure applying means for controlling lzoth the generation and the application of pressure.

Qination, a multiple pump, means apart therefrom for applying the pres sure generated therehy, and an individuallymovable memher interposed between said pump and said pressure-applying means in which member is mounted the pump and pressure valves.

10. In comhination, a multiple pump, means apart therefrom for applying the pres sure generated thereby, and an individually movable member interposed li-etween said pump and said pressure-applyin means in which member is mounted the pump and pressure valves and which is provided With means for their manual control.

11. In combination, a multiple pump, means apart therefrom for applying the pressure generated therehy at a plurality of se lective points, and an individually-movable member interposed between said pump and said pressure-applying means in which memher is mounted the pump and pressure valves and which is provided With means for their manual control.

12. In combination, a multiple pump, a ram cylinder and ram, flexible connecting conduits therebetween, and a member 10- &

cated intermediate the ends of said conduits and common to all thereof in which member is located the ump and pressure valves.

13. In com ination, a multiple pump, a ram, flexible fluid-transmitting means therebetween, and an individually-movable memher in said transmitting means having provision for controlling flow to and from the pump between said member and the pump and to and from the ram between said memher and the ram.

14. In combination, a multiple pump, a plurality of rams, flexible fluid-transmitting means therebetween, and an individuallymovable member in said transmitting means having provision for controlling flow to and from the pump between said member and the pump and to and from the ram between said member and the ram.

15. In combination, a multiple pump, a ram, a flexible conduit from each pump chamber and to said ram, said conduits uniting in an individually-movable member and said member being provided with means for the control of the flow through said conduits.

16. In combination, a multiple pump, a plurality of rams, and a flexible conduit from each pump chamber and to each ram chamber, said conduits uniting in an individuallymovable member and said member being provided with means for the control of the flow through said conduits.

17. In combination, a multiple pump, a plurality of rams, and aflexible conduit from each pump chamber and to each ram chamber, said conduits uniting in an individuallymovable member and said member being pro vided with means for the supply of liquid to said conduits and means for the control of the duration and direction of flow therethrough. 7

18. In combination, a double pump, aram, a flexible conduit from each pump chamber and to the ram chamber, said conduits uniting in an individually-movable member, said member being provided with means for the supply of liquid to said conduits and with means for rendering one or both of said pumps inoperative and for relieving the pressure in the ram chamber.

19. In combination, a double pump, a plurality of rams, a flexible conduit from each pump chamber and to each ram chamber,

said conduits uniting in an individually-movable member, said member being rovided with means for the supply of liquid to said conduits and with means for rendering one or both of said pumps ino erative and for relieving the pressures in t e ram chambers.

20. In combination, a double pump, a ram, a flexible conduit from each ump chamber and to the ram chamber, said conduits uniting in an individually movable member, a series of suitable pump and pressure valves in said member, means for successively unseating said valves in order, and means for supplying liquid to the pump chambers.

21. In combination, a double pump, a plurality of rams, a flexible conduit from each pump chamber and to each ram chamber, said conduits uniting in an individually-movable member, a series of suitable pump and pressure valves in said member, means for unseating one or more of said valves to render one or both of said pumps inoperative and relieve the pressure in the ram chambers,

and means for supplying liquid to said pump chambers. 1

22. In combination, a double pump, a ram, a flexible conduit from each ump chamber and to the ram chamber, saic conduits uniting in an individually-movable member, a series of valves in said member, one controlling back-flow to one of said pumps, one controlling back-flow to the other pump, and one controlling back-flow from the pressure chamber, and means for unseating positively one or more of said valves.

23. In combination, a double pump, a plurality of rams, a flexible conduit from each pump chamber and to each ram chamber, said conduits uniting in an individuallyinovable member, a series of valves in said member, one checking back-flow to one of said pumps, one checking back-flow to the other of sald pumps, and the third checking back-. flow from the pressure chambers, means for positively unseating one or more of said valves, and means for supplying liquid to the pump chambers.

In testimony of the foregoing, I have hereunto set my hand in the presence of two witnesses.

JAMES W. NELSON.

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