US1510830A - Pump - Google Patents

Description

H. M. CRIPPEN oct'. 7- 1924.,

PUMP

Filed Aug. 18, 1923 Inv@ infor:

Patented ct. 7, 1924.

.HENRY IVI. ORIPEEN, QF ATHENS, 10H10,

nssrenon or cnn-,FOURTH .To FRED H. FINSTERWALD AND o. A. rrnsuniawnro, :Born or AKRON, omo.l

PUMP'.

Application led August 18, 1923. Serial No. v 658,081412.

To @ZZ whom @it may cof/tecra.'

-Be 'it known that I, HENRY M. CRIPPEN, a citizen of the United `States, residing at Athens, in the county of Athensand State ci Ohio, have invented certain new and useful `:Improvements in Pumps, of which the following is a specification.y

My invention relates to pumps.

The object ofthe invention is to avoid :the

vuse of cup leathers, 'in the use of which there is so much pressure on the cylinder wall as to quickly wear out such form of packing, and lto substitute -a construction of piston in which an ordinary flat packing l5 strip-or ring may be employed, and ,in which `pressure will be exerted against the packing to force it in proper contact with the cylinder vwall during the compression (stroke, and

the suction stroke of the piston, causing a release of such pressure and permitting a lfree flow of fluid ypast the piston .to again till 'the cylinder.

'These objects I' accomplish bythe construction shown in the accompanying draw/ in@ in which;

2 ig. l shows in lvertical section a pump having my 'improvements applied thereto; the piston vbeing at the end or the compression stroke.

F ig. 2 is a plan view of the handle Aand hose retainer.

Fig. 3 is an enlarged sectional view of the upper end of the cylinder, showing the position of the piston elements as they near the end of the suction or up stroke.

Fig. 4 shows a similar view with the parts inthe Vposition they'v occupy at the comple tion of the up stroke and beginning of lthe compression or ydown stroke.

lFigs. 5 and'are sectional views oi' a mod- 'ied Jform of piston; Fig 5 showing the parts inthe compression ystroke and Fig. '6 with the parts in the up or suction stroke.

Fig. '7 shows the packing strip.

The pump illustrated 'is shown as an ordinary air ortire Vintlating pump .comprising a cylinder 1, foot base 2 having a hose nipple 3 provided with a suitable inward-ly `closing ball check valve et, cap piece 5 and hose 50 6 provided'with a suitable nozzle 6.

y'These parts are of the usual or any ap* proved construction and may beadapted tor air, water .or other iiuid.

'The piston proper 10 yhas an annular tapered shoulder 11 around its :lower outer more air passages or openings *22" lextending vertically through it from its lower to its upper tace, other air and lubricating ports 25 extending from the upperend of the piston body 13 downwardly and fout-- wardly to the rear face vof the packing 16. A valve r14C 'in the form of an inverted cup 'is provided at `its lower edge with la bevel -15 y which, `in connection with the beveled shoulder y11, will tend in the down or coinpression stroke lto torce packinglstrip '1'6 out against the cylinder wall .fand prevent the air from escaping past the edges-of the strip. The 'upper end ofthe Ipiston body 13 yisv of slightly less diameter than the interior of the valve Msothat the piston body 13 will telescope therein and be held properly and guided at this point'. The valve 14 has a central ldownwardly tapering yopening 17 eX- tending through its `upper closed end and this tapered opening is adapted to yreceive a tapered shoulder 22 on the rod 20 at the upper end oi' its reduced portion.v The 'shoulder r22 wedges lint-o this tapered opening 17 on the `down stroke of the piston, and rin sov doing closes the said opening and forces down the valve 14 until its beveled edge firmly engages vthe upper redge of the packing so that nojliuid may pass the piston dur` ing the effective stroke.- -Then the .piston `is moved upward on its suction"strokejthe vrod 20 will lift the valve 11i, Ias in Fig. 3, and Iperm-'it air vin 'the cylinder to `rushpast the exterior of the said valve under its lower edge-and down through opening 22 'into the lower end of lthecyl-inder; the packing 16at this time being :free from the compressing action of the vbeveled portions 15, 11, vand so will be relieved of wear. When the vpiston reaches 'its extreme up .stroke the valve may yStrike `cap 5 and be momentarily released, as in Fig; @whereupon the downward movement oit .rod 720 will torce `the shoulder into Ithe valve opening 17, which in turn will cause the parts to assume the position shown in Figs. 1 and 3. In such down or pressure stroke air will pass up through opening 22 into the air chamber formed by the interior of valve 14 and through openings 25 and exert outward pressure on the rear face of the packing strip and assist in holding it to the cylinder wall. When the valve 14 is thus released by striking cap 5 the nut 21 will lift piston 10 until packing 16 is forced against bevel 15 and so expand the packing and tighten it against cylinder wall. rllhis is useful in case of the packing becoming contracted or set should the pump remain idle for any length of time.

'Ihe conical surfaces 22, 17 will hold the valve 14 strictly parallel with the interior of the cylinder and hold it against any tilting action.

It will be understood, of course, that the valve 144 is of less external diameter than the interior of the cylinder so that the air is free to pass in the up or suction stroke and also that the cylinder is open to the atmosphere through the opening in cap 5 or otherwise.

In Figs. 5 and 6 the valve 14 is provided with grooves 2S to allow the free passage of the fluid to and under the lower edge of the valve and thence down through the opening vor openings 22', as in Figs. 1 and 2, when the valve is raised on the up stroke, as in Fig. 6. The operation is the same as in Figs. 1, 3 and 4.

The lower inner face of valve 14 has a rounded boss 27 and the upper face of the piston body 13 has a corresponding recess 27 to receive this boss and permit the parts to telescope as the packing wears down.

It will be noticed that the inner lower face of valve 14 is of less diameter than the lower face of the piston 10 so that there is less pressure on valve 14 during the compression stroke than there is upon the lower end of piston 10, which allows the piston to move up to the lower edge of the packing to close all. leak at this point.

I have found that Babbitt metal is a good material for the piston and its valve, and as the piston rod is of steel there will be the proper amount of friction between the conical surfaces 22, 17 to cause the rod to lift the valve as described.

The upper end of the rod 2O is formed as a combined handle and hose retainer 29. The handle has an opening at both sides of the rod and the free end of the hose 6, is passed up through one opening and down through the other, as in Fig. 1, so that the hose is properly secured while the pump is being carried or is in storage. The handle is formed by bending the rod in the form of two loops 30, 30 lying in a horizontal plane with the free end 31 of the loop swaged down, where it joins the upper end of rod 20. A clip 32 embraces the. parts at this point. This forms a highly useful improvement, as heretofore the hose has been free to fall around in the way, and this trequently causes the hose and valve 6 to become injured.

What I claim is:

1. In a pump, a piston comprising a cylindrical body having an air opening eX- tending therethrough from its upper to its lower side, a central opening, and an external annular collar or shoulder around its lower end, a piston rod extending at its lower end freely through the said central opening' and having means for holding` the valve from falling off, a valve on the rod above the piston in the form of an inverted rigid cup with its lower packing-expanding edge spaced. from the said annular shoulder;

the space between said lower edge of the valve and the said shoulder provided with a packing strip.

2. The combination with a piston rod and a piston having a cylindrical body through which the lower end of the rod freely :l

passes for limited movement; said body having an opening through it to one side of the rod and an external annular shoulder around its lower end, a packing strip around said cylindrical portion, and an inverted cup-shaped valve carried by the rod with its lower edge engaging the upper edge of the packing strip; the valve being constructed for the passage of liuid around and under its lower edge to the piston passage.

3. The combination with a piston rod provided with a reduced lower end having a downward tapered shoulder at the juncture of its two diameters, of a piston mounted freely on the lower end', of the rod for limited vertical movement thereon, the said piston having a cylindrical body to receive a packing strip therearound, an external annular shoulder to support the lower edge of said packing and a through fluid passage to one side of the piston rod, and an inverted cup-shaped valve having a tapered opening in its upper closed end to receive the tapered shoulder on the piston rod; the lower edge of the valve adapted to engage *the upper edge of the packing in the compression stroke and the valve and pistony moving apart on the suction stroke to allow the iiuid to pass the lower edge of the valve and pass through the piston passage.

4. The combination with a piston rod, of a piston through which the lower end of the rod freely passes, a nut on the rod below the piston; said piston having a cylindrical body, an external annular tapered shoulder and a through fluid passage, and other passages leading from its upper edge out through its side wall, a packing strip around the cylindrical body with its lower edge resting on said shoulder, and a valve on llt) the rod over the piston and rhaving an annular beveled edge engaging the upper edge of the packing strip.

5. The combination with a piston rod having a tapered shoulder, of a piston having limited movement on the rod below said shoulder and provided with a through port or passage, and an external annular collar, an inverted cup-like valve telescoping the body of the piston andhaving a central tapered opening receiving said tapered shoulder; the inner lower face of the valve having a central boss and the upper end of the piston body having a recess to receive said boss.

In testimony whereof I zLfIiX my signature.

HENRY CRIPPEN.

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