US116051A - Improvement in direct-acting engines - Google Patents

Description

IHOMASHANSON.

Direct Acting Engines.

- l Patented 11111620.1871.

UNITED STATES PATENT OFFICE.

THOMAS HANSON, OF NEW YORK, N. Y.

IMPROVEMENT IN DIRECT-ACTING ENGINES.

Speciiication formingpart of Letters Patent No. 116,051, dated June 20, 1871.

To all whom it may concern:

Beit known'that I, TnoMAs HANsoN, of the city, county, and State of New York, have invented a new and useful Improvement in Direct-Acting Engines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawing forming a part of this specification, in which- Figure lis a side elevation. Fig. 2 is a partial vertical longitudinal section through the center of the steam-cylinder, and Fig. 3 is a vertical cross-section at the lines x x of Fig. 1.

In the several figures the same part is designated by the same letter of reference.

Various means have been adopted for working the steam-valve by motion derived from the reciprocation of the piston of the steamcylinder, and various kinds of valve-gear have been employed.

My invention has for its object a simple and eEicient construction or combination of devices by which the valve, through which the steam is admitted to and exhausted from cach end of the cylinder alternately, is worked directly from the piston-rod; and to this end my invention consists in the combination, with Vthe piston and valve, of a valve-rod, which Vhas a reciprocating motion imparted to it by the combined action of the piston at each stroke and an automaticV spring-cam, as hereinafter more fully explained, and which, through suitable connections, operates the steam-valve, and thus regulates the passage of the steam to and from the steam and exhaust ports of .the cylinder, all as hereinafter more fully explained.

To enable those skilled in the art to make and use my invention, I will proceed to describe its cQnstruction and operation.

In the annexed drawing, uJ represents the steam-cylinder, which is made about as usual,

and it is shown connected, by a casting, b, to

the pump-cylinder c, the whole being supported and secured, by suitable castings d d, to any desired foundation. Thevpump-cylinder c is operated, with its piston, induction and eduction pipes, and valves, in the usual way. E is the steam-piston, and f the piston-rod, which, as is customary in direct-acting steam-pumps, passes from the steam-cylinder into the pumpcylinder. From the outer head of the steamcylinder a there projects an arm, g, which supports at its outer end a hollow vertical standard, h, in which are formed the bearing of and in which work the valve-actuatin g mechanism,

`about nine inches in depth for a cylinder ten inches in length-for the reception of one end of a valve-rod, m, the inner end of which is formed with a short head, and it passes through a nut, m', screwed onto the end of the pistonrod, and thence'it passes out through the head ofthe steam-cylinder, as shown, being provided with a suitable stuffing-box.- This rod m is so fitted into the bore of the piston-rod as to have a certain amount of end-play, and its outer end is attached to a double-cam bar, n, the form of which is clearly shown in Fig. 2. This cambar n is in the form of a double-inclined plane, and it is operated upon by a caster-wheel or roller, o, in the lower end of a rod, p, and this rod is forced continually downward by a pressure-spring, q. On the valve-rod m is keyed one end of an arm, r, which extends upward, and has connected to .it one end of a bar, s, which at its other end is pivoted to the lower portion of a crank-plate or arm, t, that is hung loosely on the axis of the steam-valve or threeway cock j; and a pin or tappet, t', projects from the said crank-plate and works in a curved slot, u, of another arm or plate, w, -Which vis secured fast on, and which serves to turn, the cock or steam-valve. The pump andv steamvalves and pistons may be packed in any eii'ective manner well known toengineers, and therefore not necessary to be described or represented. y

The operation of my improved engine may be thus explained: When steam is admitted through the cock j to one end of the steam-cylinder, and the piston, with its rod, moved toward the other end, the piston, after having made a portion of its stroke, brings the bottom ofthe bore in the piston-rod against the short head oli-the inner end of the rod m, and hence carries along with it the said rod m, which carries the double-cam bar n; and when the latter has been forced so far as to bring the apex ofthe double-inclined cam beneath the pressure-roller o, the. latter acts upon the opposite inclined face of the said cam, and causes it to complete its motion or stroke in the direction in which it was moved by the piston-rod at a greater velocity than that ofthe steam-piston, or to run ahead of the piston; and this accelerated motion of the said cam-bar and its rod m effects the shifting of the steama'alvej by the time the piston has reached the end of its stroke, for during this last part of the stroke of the rod m, or that part of its stroke which is accelerated by the action of the pressureroller ou the cam, the pin or tappet t passes up to the end ofthe slot u and moves the plate -v about one-sixth of a revolution7 or so as to turn the steanrcock or valvej about one-sixth of a revolution and change the supply of steam to the opposite end ofthe cylinder. The steampiston is now driven in the opposite direction, and after having made a portion of its stroke the nut m aets against the short head on the inner end of the rod m and carries along with it the said rod and its cam-bar, which, before the steainpiston reaches the end of its stroke, are forced ahead by the pressure-roller o acting on the inclined surface of the cam, and thus again shifting the valve. In this way the operation is repeated at each stroke of the piston.

The pressure of the spring, which forces the roller o down onto the cam-plate, may be regulated by a cap-piece, w, 'or in any other desirable manner; and the details of construction and the proportion of the different parts may, of course, be varied at the discretion of the constructor.

What I claim as new, and desire to secure by Letters Patent, is*

In combination with the steam-piston and valve, the employment of the Valve-rod m, working in the semi-hollow piston-rod for the purpose of operating the steam-valve mechanism, and which receives its motion at each stroke of the piston partially from the pistonrod and partially from a driving-spring and cam, substantially in the manner described.

In testimony whereof I have hereunto set my hand this 1st day of May, 1871.

THOMAS HANSON.

Witn esses:

WM. H. BrsHor, F. L. MATHEWS.

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