US246880A - Habdpitmp - Google Patents

Description

(Model.) A

A.' HAMILTON.

HAND PUMP.

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UNITED STATES PATENT OEEICE.,

ALEXANDER HAMILTON, OF NEV YORK, N. Y.

HAND-PUMP.

SPECIFICATION forming part of Letters Patent No. 246,880, dated September 13, 1881.

' Applicationfled October 1,1880. (Model) To all whom it may-concern:

Be it known that I, ALEXANDER HAMILTON, of the city, county, and State of New York, have invented a new and useful Improvement in Hand-Pumps, of which the following is a specification.

Figure l is a side elevation of the improvement, partly in section. Fig. 2 is a sectional elevation of the upper valve and the parts of the cylinders with which it is connected, enlarged.

Similar letters of reference indicate corresponding parts.

rIhe object of this invention is to furnish hand or portable pumps for sprinkling plants l and trees with water or other liquid, for putting out fires, washing carriages, windows, and sidewalks, and for other purposes, so constructed that it can be adjusted to throw a jet, a spray, both a jet anda spray, and to shut off the water.

A represents a hose, to one end of which is attached a small filter or screen, B, to prevent impurities from being drawn into the pump and clogging the valves. The other end of the hose A is attached to a nipple formed upon the cap O, screwed upon the end ofthe outer Ypump-cylinder, D, forming a valve-chamber.

Within the cap or valve-chamber@ is placed a valve, E, opening upward to admit water to the pump, and to prevent the water from being forced back into the reservoir. The valve E is kept in line by its stem passing through a bar or, perforated plate placed in the upper part of the chamber O, and is held down toits seat, except when forced upward by the pressure of the entering water, by a spring placed upon its stem and interposed between the said valve and its guide-bar.

Within the cylinder D is placed a cylinder, F, of such a size that the capacity of the said cylinder F shall beequal to the capacity of the rin g-space or water-chamber f between the two cylinders D F. The inner cylinder, F, is made to work watertight through the forward end of the outer cylinder, D, by a stuffing-box, G, attached to the end of the said cylinder D.

To the inner end of the inner cylinder, F, is secured, by a screw, pin, or rivet, H, a cap, I, having a tube or hollow neck, J, upon its lower part. The cap I is made of such a size that the water will have a free passage-way between it and the outer cylinder, l). To the end of the neck J of the cap I is attached, or upon it is formed, the bottom of a water-way cup, K,which bottom has a number of apertures, L,formed through it, around the end'of the neck J, the combined area of which apertures L is equal to the area of the cavity of the neck J of the cap I, so that the amount of water that passes through the neck J into the cylinderF will be equal to the amount of water that passes through the apertures L into the space or water-chamber between the cylinders D F. rlhe lower part of the cup K is made smaller than the upper part, and upon the outer surface of the said `smaller part is formed a screw-thread, g, to t into a screw-thread, h, cutin the inner surface of the sides of the valve-chamber M. In the bottom ofthe chamber M is formed an aperture, the sides of which are beveled to form a seat for the Valve N. The valve N is kept in line by its stem, which passes through a guide-hole in a bar attached to the watenway cup K, and is held closed, except when opened by the pressure of the water, by a spring placed upon the valve-stein between the valve and the guide-har.

rlhe cap I and the water-way cup K and the valve-chamber M are centered in the cylinder D by ring-flangesformed upon them, and which tit against the inner surface ot' the said cylinder D, and are made to work water-tight by a packing, O, clamped against the bottom of the chamber M by a plate, P, secured to the said bottom by screws.

With this construction, when the inner cylinder, F, is drawn outward the tendency is to form a vacuum in the lower part of the outer cylinder, D, which causes the air-pressure upon the surface of the water in the reservoir to force the water through the hose A, causing the water to open the valve E and pass into and till the cylinder D. As theinner cylinder, F,is forced inward the pressure upon the water thus produced closes the valve E, opens the valve N, and causes the water to pass into and fill the inner cylinder, F, and the space or water-chamber between the cylinders D F. As the inner cylinder, F, is again drawn outward the water again opens the valve E and lls the cylinder D, and the water between the cylin- TOO ders D F is forced through the apertures L and neck J into the cylinder F, forcing the water already in the said cylinder F out at the upper end ot' the said cylinder F, producing a discharge. As the inner cylinder, F, is again forced inward the pressure upon the water in the cylinder D closesV the valve E and forces the water through the valve N into the space or water-chamber between the cylinders D F, filling it, and into the inner cylinder, F, forcing the water already in the cylinder F out through the upper end of the said cylinder F, again producing a discharge. This construction causes the pump to throw a continuous stream, or makes it double-acting.

I am aware that a portable force-pump has heretofore been constructed of an outer barrel having valves at its lower end and inclosed by an exterior casin g to form a water-chamber, a hollow rod or tube being arranged within the outer barrel and working through a stuffingboX at the end thereof, the inner end of said hollow rod or tube being contracted to form a tubular neck, on which is arranged amovable piston, said neck being perforated to admit water between theouter barrel and the hollow rod or tube, the said piston being arranged to slide on the contracted neck to alternately open and close the perforations therein as the piston is raised and lowered, as in United States Patent No. 199,380; but such structure is not claimed by me, and does not constitute my invention, an important feature of which consists in providing apiston which is fixed in relation to the inner cylinder, and in so arranging the apertures which connect the valve-chamber and the intervening space between the inner and outer cylinders that they remain permanently or at all times open for the passage of water; and, further, in so constructing and arranging the apertures around t-he neck which connects with the innercylinder that the combined area of said apertures is equal to the passage through said neck, so that equal amounts of water pass through the apertures and through the neck, and thereby equal amounts ot' water will be ejected through the inner cylinder at both strokes of the piston.

Having thus fully described my invention, I

claim as new and desire to secure by Letters Patentl. In a portable hand-pump, the combina tion, with the outer cylinder, D, havinga valve, E, and the inner cylinder, F, passing through a stufng-box, G, and arranged to provide the intervening water-space, of the cap I, rigidly attached to the end of the inner cylinder and having a contracted neck, J, the cup K, attached to said neck and having in its top a series of apertures, L, arranged around the neck, and which remain permanently open for the passage of water, and the valve-'chamber connected to the cup and containing a springvalve and formed at one end into a piston, all substantially as described.

2. The combination, with the outer and inner cylinders arranged to provide the intervening water-spacef, of the cap I, having the contracted tubular neck J,communicating with the inner cylinder, the cup K, having a series ot' apertures, L, arranged around the neck, and which remain permanently open for the passage of water to the space f, and the valvechamber M, containing a valve, N, and constructedwith arigidpiston, the combined area ot` the said apertures L heilig equal to the passage through the tubular neck J, as and for the purposes herein set forth.

3. The combination, with the outer cylinder, D, having a valve, E,at its lower end, and the inner cylinder, F, arranged to provide the intervenin g spacef, of the cap I, rigidly attached to the end ot' the inner cylinder and having a contracted neck, J, the cup K, attached to said neck and constructed with aseries ot' apertures, L, 'arranged around the neck, and which remain permanently open for the passage of water to the spacef, the valve-chamber M, connected with the said cup and provided with a valve, N, and a xed piston, the valve-chamber and cup being provided with riiig-tlanges to center them in the outer cylinder, all substantially as herein described.

ALEXANDER HAMILTON.

Witnesses:

JAMES T. GRAHAM, C. SEDGWIGK.

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