US173031A - Improvement in steam-pumps - Google Patents

Description

UNITED STATES PATENT EEIcE;

JAMES W. MATHIESON, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN STEAM-PUM PS.

Specification forming part of Letters Patent No. 173,031, dated February 1, 1876; application filed July 6,1875.

This invention is intended to be used eitherv for water, or as an airpump or compressor, vacuum-pump, or blowing-engine.

In the drawing, Figure l is a vertical scction. Fig. 2 is a plan of the pumping-engine,

and Fig. 3 is a section of the governor.

The bed-plate a, steam-cylinder b, pumpcylinder c, single pistonrod d, crank c, and

4fly-wheel c4 areas usual in steam-pumps, and

the pitman or connecting-rod e1 is attached at one side of the cross-head and adjacent to the piston-rod, and said pitman and its crank e swing clear of Athe piston-rod, so as to limit the movement of the pistons by the crank, and the piston-rod extends from the steam to the water piston through the cross-head, and is secured thereto by a screw or key. rlhe pump-cylinder c is horizontal, and the piston f reciprocates therein.

The induction-valves g are upon the inner surfaces of the cylinder-heads, near the bottom, and the outer sides of the heads are provided with `movable caps hl, that form ports connecting with the hollow bed-plate or chamber at h2, to which the suction-pipe h3 is connected when the engine is used for pumping, or through which pipe h3 water to lubricate the cylinder is supplied as required, the water being drawn into the cylinder, and serving to lessen friction andto lill the passage-ways and spaces at the termination of each stroke, and thereby insure greater efficiency of the pump in its action upon air.

The eduction-valves h are atthe top of the cylinder c, and open into the compressioncham ber t'.

Both the induction and eduction valves are formed of sheets of rubber, secured to the seats by bolts which pass through curved gua rds k, and through holes in the rubber, and the valve-openings are numerous, or provided with bridges to prevent the rubber being drawn into the openings.

The elevation, Fig. 4, represents the inner surface of a vportion of one of the cylinderheads. v

The curved guards k limit the distance that the sheet-rubber valves move in opening, and the sheet-rubber valves press closely against these guards k when open. The action of each guard is thus to compress the valve upon the side next to the guard, and to stretch the other side, which action assists the valve to spring back quickly to its seat when liberated, and the guards are perforated to allow the air to reach the back of the valve and facilitate the movement as the valve seatsitself.

I am aware that valves of india-rubber between a seat and a back plate or guard, that limits the movement of such valve, havebeen used.

My improvement is especially available as an air-pump, because the induction-valves, being upon the inner surface of the head, close rapidly by the action of the water that is admitted with the air into the air-pump; hence the air will be expelled upwardly above the water as the piston moves toward the head and causes the water to rise, and the air, es-

caping through the eduction-valves at the top of the cylinder, is followed by any surplus water, and the eduction-valves, closing in such Water, are rendered perfectly tight thereby, and a much better vacuum is o btained upon the return stroke of the piston than in the pumps heretofore constructed.

It will be apparent that the guard-plates prevent too great movement of the valves, that the valves close rapidly and tightly upon the metal surfaces around the water-ways, and that the exit-valves close instantly by gravity, as they are in a vhorizontal position, and the water above them insures their being tight. I claim as my invention- The induction-valves g upon the inner surfaces ot' the cylinder-heads, near the lower portions thereof, covering the inlet-openings and formed of india-rubber, and protected by the perforated guards h -at the backs of such valves?, in combination with eduction-valves similarly constructed, and applied at the exitopenings above the cylinder, in the manner and for the purposes set forth.

Signed by me this 2d day of July, A. D.

JAMES W. MATHIESON.

Witnesses:

GEO. T. PINGKNEY, v CRAs H. SMITH.

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