US1472947A - Valved piston - Google Patents

Description

L. THARP VALVED PISTON Filed July 31. 1922 2 SheebS-Sheeb l abtozwuj Nov. 6, 1923. 1,472,947

' v L.. THARF VALVED PISTON Filed July 31, 1922 2 Sheets-Sheet 2 f ma Patented Nov. 6, 1923.

LEE THARP, or BURLINGTON, iowa.

VALVED PISTON.

Application led July 31,

To all whom t may concern.'

Be it known that I, LEE THARP, a citizen of the United States, residing at Burlington, in the county of Des Moines and State of owa, have invented new and useful VImprovements in V alved Pistons, of which the following is a specification'.

@ne of the Vobjects of my said invention is the provision of simple, durable and highly efficient valved pistons for single or double cylinder air pumps.

Another object of the invention is the provision of a compound air pump characterized by my novel valved pistons.

To the attainment of the foregoing, the nvention consists in the improvement as hereinafter described and definitely claimed.

In the accompanying drawings, forming part of this speciiicatin:-

Figure 1 is a view, partly in vertical section and partly in elevation of so much of a compound air pump as is necessary toY illustrate my improvement.

Figures 2, 3 and 4 are horizontal sections taken in the planes indicated by the lines 2 2, 3 3 and 4.-4, respectively, of Figure 1, looking in the directions indicated by arrows.

Similar numerals of reference designate corresponding parts in all of the views of the drawings.

The pump illustrated comprises a base 1 with a conduit 2 in association with a large cylinder 3 and a compzratively small cvlinder 4, the said cylinder 4 being provided with an appropriate eduction conduit, and the two cylinders being connected at their lower ends by the before mentioned conduit 2.

In the cylinders 3 and 4 are piston rods 5 and 6, respectively. and threaded on the said rods 5 and 6 are the bodies 7 and 8, respectively, of my novel valve units, said units being readily attachable and detachable. The body 7 of the unit in the large cylinder 3 is provided with a pendent stem 9 and threaded on the said stem 9 is a metallic plate 10 arranged with its perimeter spaced from the side wall of the cylinder. Also threaded on the stem 9 is a nut 11 and above the said nut 11 is arranged a metallic plate 12 that is freely movable on the stem 9 between the plate 10 and the nut 11. The said plate 12 is apertured at 13, for the passage of air, the said apertures being 1922. Serial No. 578,620.

formed by striking up the plate as'indicated by 14, and the struck up portions of the platebeing bent over a flexible packing layer 15 as illustrated so as to strongly'connect said layer 15 to the plate 11,2. The layer 15 is of'such diameter as to provide it with a depending flange 16 that is interposed between the periphery of the plate 12 and the wall of thecylinder 3 as illustrated. y

ln addition to the body 8 the other unit referred to comprises a tubular member 20 threaded into the lower tubular portion 21 of the body 8, a nut 22 threaded on the member 20, plates 23 surrounding the tubular member 20 above the nut 22, and a flexible packing layer l24 interposed and held between the plates 23 and having the flange 25 arranged to wipe against the wheel of the cylinder 4 as illustrated. The tubular portion of the body 8 is apertured as indicated by 26 to form a cage or a ball valve 26 which is adapted to seat in the upper end of the tubular member 2O and is freely movable in the said cage.V

It will be manifest from the foregoing that my novel Yunits may be expeditiously and easily substituted for those now in use in air pumps of the ordinary construction.

In the practical use of a pump embodying my improvement it will be understood that on the up stroke the plate 12 with the packing layer 15 thereon will drop tothe nut 11 leaving ample space between the plate 10 and the packing layer 15 for air to reach and pass through the apertures 13 to a point in the cylinder below the valve` On the down Ward stroke the plate 10 will bear solidly against the layer 15 of leatheror other appropriate material. It will also be observed that on the downward stroke the valve in the cylinder 3 will Vforce air through the conduit 2 and into the small cylinder 4 vand up through the tubular member 20 and past the valve27 so as to force compressed air vinto the cylinder 4 and outthroughthe eduction `opening thereof. Again. on thev up stroke it will be noted that the valve 27 will be seated and make an air tight joint at the same time that the latter Vlayer 25 is tight against the wall of the cylinder 4. Manifestly at this time the valve in the cylindery 3 will be open as shown for the filling of the cylinder with air, the air passing downwardly through the space about the plate l0. In the small valve the air has an easy passage ln addition to the practical advantages ascribed to my improvement it will be appre ciated thatV a pump embodying` the same is at once easily operable and powerful.

I have entered into a detailed description of the construction and relative arrangement of the parts embraced in the present and preferred embodiment of my invention in order to impart a full, clear and exact understanding of the said embodiment. I do not desire, however, to be understood as conining myself to the specific construction and relative arrangement of parts inasmuch as in the future practice of the invention various changes and modifications may be made such as fall within the scope of my invention as defined in my appended claim.

Having described my invention, what l claim and desire to secure by Letters Patent is zvalve unit comprising a body adapted for yconnection to a rod and having a stem, a-

plate fixed to said stem, an apertured plate movable on the stem, an apertured flexible layer secured on the apertured plate, and means retaining the apertured plate and the flexible layer on the stem-5 the said apertured plate having struck-up portions about its apertures, and said struck-up portions serving to attach the flexible plate.

n testimony whereof, afliX my signature.

LEE THARP.

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