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Publication numberUS281695 A
Publication typeGrant
Publication dateJul 24, 1883
Filing dateNov 23, 1882
Publication numberUS 281695 A, US 281695A, US-A-281695, US281695 A, US281695A
InventorsAkd Cliffobd A. Holcombe
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 281695 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)

w. H. & o. A. HOLGOMBE.


Patented July 24, 1883.



lo-Lillnmnpher. Wnhinglon. n. c,




SPECIFICATION forming part of Letters Patent No. 281,695, dated :Tuly 24-, 1883. Application filed November .23, 1882. (No model.)

To all whom it may concern:

Be it known that we, WILLIAM H. HOL- ooMBE and CLIFFORD A. HoLcoMBE, of Beloit, in the county of Rock and State of Wisconsin, have invented certain Improvements in Double-Acting Pumps, of which the following is-a specification.

This invention consists in a double-acting pump composed of a cylinder having a valve at its lower end, a flexible packing-ring at or near its mid-length, adapted to serve also as a valve, and an elongated piston, one half of which is of larger diameter than the other half, and the larger portion of which is materially smaller than the interior of the cylinder, in order thatthe water may pass upward between the cylinder and piston.

in the drawings, Figure 1 represents a vertical central section of our improved pump, and Fig. 2 a cross-section on the line y y.

The object of our invention is to produce a simple, cheap, and efficient double acting pump which may be easily kept in repair, the present device being simply an improvement upon that for which application was made by us on the 7th day of August, 1882.

In the drawings, A represents the pumpcylinder, preferably formed in two sections, and furnished at theirpoint of meeting with a flexible packing-ring, B, which serves at once as a packing for the joint or union, as a packing for the piston O, and as a valve, as in the former case above referred to, the piston being made of a diameter materially smaller than the interior of the cylinder, and the packing being extended inward and upward from the cylinder-walls to the piston in such position that it may rise from its normal position, but cannot fall below the same, because of contact with the piston. The cylinder A is furnished at its lower end with an upwardlyopening valve, D, and at its upper end with an outlet-pipe, E, for the admission and discharge of the water.

The piston C is made inthe form of an elongated cylinder of two different diameters, the upper half or section being the smaller, and being arranged to pass out through a central opening in the top of the cylinder, which opening is packed by a flexible ring, F, set at an angle in the manner similar to the packing B, but turned downward and'not arranged to act as a valve.

It will be seen that when the packing is arranged as shown, the pressure of the water against it causes it to lie close against the piston, and to insure a perfectly-tight packing thereof. I

The upper section, a, of the piston, though of considerably smaller diameter than the lower section, is still of sufficient size to pro duce a marked and considerable displacement of water from the cylinder, and hence the oporation of the pump will be as follows: First, the piston is raised, producing a vacuum in the cylinder and causing the valve D to rise, thereby permitting the inflow of water to fill the vacuum. The piston is then forced down, and the water, being displaced thereby in the lower end of the cylinder,- and prevented by the closing of valve D from escaping through the lower end,forces its way upward between the cylinder and piston, raising the packing B, which thus acts as a valve. As the water rises above the valve and packing B it is again displaced by the reduced portion a of the piston, and consequently rises and passes out through outlet E, whence it is conducted to the desired point. The water remaining in the upper end of the cylinder, or the bulk thereof, will be forced up through outlet E by the elevation of the piston, the larger portion, 1), then taking the place of smaller section, a, which rises through top of cylinder A, as already explained. The subsequent rise and fall of the piston causes the actions stated to be repeated, and thus a continuous flow is produced.

The packing-ring B may be supported by a channeled ring or'ledge, c, as shown; or this may be omitted, as preferred, though for larger pumps it will generally be thus supported.

We are aware that doubleacting pumps have been made in whichv two independent pistons of different diameters, operated by a common handle or lever, served to force water at both strokes of the piston, or at both movements of the operating-lever, and this we do not claim.

Having thus described our invention, what we claim is- 1. The herein-described pump, consisting of cylinder A, having combined valve and packing B, valve D, and outlet E, and piston 0, having upper and 10W01 sections, a Z), of different diameters, substantially as and for the purpose set forth.

2. The herein-described pump, consisting of cylinder A, flexible ring D, piston 0, con-

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5817955 *Mar 27, 1997Oct 6, 1998Bayer CorporationApparatus for simultaneous aspiration and dispensation of fluids
Cooperative ClassificationF04B33/00