US243776A - Steam-pump - Google Patents

Description

(No M-o'del.) l

J HENSHALL.

STEAM PUMP.

No.' 243,776. Patented July 5,1881.

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nyezim UNITED STATES' PATENT OFF-ICE. 4

JAMES HENSHALL, OF PHILADELPHIA, PENNSYLVANIA.

STEAM-PUMP.

SPECIFICATION forming part of Letters ,Patent No. 243,776, dated .Tu1y 5, 1881.

Application filed May 26, 1881.

To alt whom it may concern Beitknown that I, J AMES HENSHALL, acitizen of the 4United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Steam-Pumps; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon,which form a part of this specification.

This invention relates to steam-pumps; and it consistsin certain improvements in the operating mechanism, as hereinafter shown and described.

In the accompanying drawings, Figurel represents a plan of a steam-pump and its operating mechanism with my improvement applied thereto. Fig. 2 represents a side view ot' certain details detached.

Referring to the drawings, A designates a shaft or spindle, having a piston, B, working in a steam-cylinder at one end, the other end of the spindle carrying a pump-plunger, C, in a tubular chamber, as shown.

Adjacent to the steam-cylinder is the chamber D, into which steam is admitted through a pipe, a, the steam passing from thence into the steam-cylinder to actuate the piston, and from thence past the cut-off' sliding valve b to the dischargeport c. The course of the steam is shown by the arrows indicated by 1, 2, and 3 respectively.

Adjacent to the tube or cylindrical chamber in which moves the pump-piston C is a waterchamber, E, with a sliding cut-oft' valve, d, located tberein, said chamberE communicating with the chamber of pump-piston, as shown, and havin gadischarge-port, f. The water rises through .pipe g, and, passing the slide-valve d to the chamber of piston C, goes from thence into the chamberE and through the discharge f, the course being clearly indicated by the arrows 4, 5, and 6 in the drawings, from which (No model.)

i the operation of the parts above referred to will be readily understood.

The oscillatingmovements of the slide-valves b and d, respectively, are effected in the following manner: A pivoted rocking-lever, F, is located midway under the spindle A, as shown, said lever at its extremities having suitable connections, h and t', with the slide-valves?) and d respectively. To regulate the movements of valves the couplings of h and fi. to lever F are made adjustable by the slots m in the lever.

Acam, (indicated byG,) which is rigidly fastened to. lever F or made solid therewith, extends from said lever at its center and in opposite directions, so as to form two arms, each being somewhat in the form of a lozenge,as shown in the drawings. The cam Gr has a vertical rim, lo, extending entirely around it,within which rim and centrally oneach arm ofthe cam are two raised surfaces, n, which are also somewhat lozen ge-shaped, the purpose of this formation being to form a way in the surface of the cam Vfor the movement of a vertical pin, p, carried by the spindle A and extending into the way o'formed in the cam. The course of the pin p in the way o is indicated by the dotted line, the pin moving along the Way around each of the raised surfaces n, so that in going from one end of the cam to the other its track crosses atl the center. To insure the crossing movement of the pin in its passage the Way o is made somewhat flaring toward the center of the cam. Thus by the movement of the pin p in the cam G is effected the rocking movement of lever F, and motion is imparted to the valves -b and el respectively, the movements of said valves being limited by the cam and adjustable by means of the slots in the extremities of the rocking lever connecting with the valves. In the direct-acting steam-pump a slide-valve is thus actuated by the movement of a cam of peculiar construction, having a movement that renders it impossible to bring the valve to a position to shut off steam and stop the pump. Owing to the peculiar form of the cam from which motion is imparted to the slide-valve afull stroke is insured, and,

further, the pump commences the stroke slow- 1y, giving the Water time to fill the water-cylinder, insuring a full supply at every stroke, and preventing the pump plunger from cush- 5 ioning against the water when the cylinder is but partly lled.

Having described my invention, I claim- In a steam-pump, the combination, with the piston-spindle A, carrying a pin, p, the cam 1o G, having the crossing Way o and the rocking lever F, connecting With one or more slide valves, all arranged substantially as and for the purposes described.

In testimony whereof I sign my name inthe presence of two witnesses.

JAMES HENSHALL.-

Witnesses:

OTIs EGAN, Taos. D. MoWLDs.

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