US77336A - Improvement in steam pumping-engines - Google Patents

Description

UNITED STATES PATENT OEEIoE.

JOSHUA TUFTS, OF ATHENS, OHIO.

IMPROVEMENT IN STEAM PUMPING-ENGINES.

Specification forming part of Letters Patent No. 77,336, dated April 28, 1868.

To all whom it may concern:

Be it known that I, JOSHUA TUFTs, of Athens, in the county of Athens, Ohio, have invented a new and useful Improvement in Steam-Engines; and I do hereby declare the following to be a full, clear, and exact specification thereof, reference being had to the accompanying drawings, making part of this specification.

Figure 1 is a vertical section in the line a x, Fig.-2. Fig. 2 is a top view of the same. Fig. 3 is a vertical section in the line y 9 Fig. 2.

A represents a steam-cylinder, which may be similar to those of ordinary form, save in being of somewhat greater diameter, in the following characteristics: The piston-rod B, instead of being solid, is tubular, and receives through its rear end a plug, 0, which, being attached to the rear head D by means of a nut, E, passes axially through said head and the hollow piston F, so as to enter the hollow pistonrod B. The head of the plug has a rubber or other packing, G, to fit the bore of the hollow piston-rod, and is made to shoulder against a tubular stud, G, which, projecting inwardly from the rear head, incloses the plug G, and, with said plug, occupies the hollow piston and rod, remaining at rest therein. The interior of the piston-rod, in front of the plug, communicates, by suitable valveguarded passages,

H and I, with the suction-pump L and forcepump K, respectively, by which the boiler is fed. p

The effect of the above-described arrangement is to project into and through that portion of the piston-rod which is, for the time being, contained within the stuffing-box, a constantly-renewed stream of cold water, the ineans of propulsion of the water being the pump or pumps which are employed to feed the boilers, so that no additional mechanism is employed. By this means I effectually preserve the stufiing-box from the injurious heat to which it is subject in the ordinary steamengine, and keep it as cool as any other part of the machine, while the stationary plug 0 is eifective to restrict the cooling action to the stuffing-box, without any injurious cooling of the body of the steam.

I claim herein as new, and of my invention- The provision, in a steam-cylinder, of the hollow piston and rod F and B, communicating with the feed-water of the boiler, in the described combination with a stationary plug, 0, substantially as set forth.

JOSHUA TUFTS.

Witnesses:

HENRY '1. BROWN, L. M. JEWETT.

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