US82575A - Improvement in valve-gear for steam-eng-ines - Google Patents

Description

UNITED STATEs ATENT OFFICE.

FURMAN R. WI`LSON,OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN VALVE-GEAR FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 82,575, (lated September 29, 1868.

To all whom fit may concern:

Be it known that I, FURMAN R. WILSON, of the city and-county of Philadelphia, State of Pennsylvania, have invented new and useful improvements in the manner of working the valves of the cylinders of steam stampingmills, and also the valves of other steam-cylin-i ders 5 and I do hereby declare that the follow` ing is a full, clear, and exact description of the construction of the same, reference being had to the annexed drawings, forming part hereof,-y and to the letters of reference marked thereon.

Figure l is a perspective view of a steam stamping-mill, with my improvements added. Fig. 2 is a side view ofthe lever H H H.

The nature of my invention consists ot'a combination of mecha-nism,workin g automatically, for operating the valves of two steam-cylinders in such a manner as to produce an alternate motion to the pistons-that is, when the piston of one cylinder is driven in one direction, the piston of the other cylinder is driven in an opposite direction.

To enable others skilled in the art to make and use my improvements, I will proceed to describe their construction and mode of operation.

A A are steam-cylinders secured in an upright position on the bed-plate B, being supported by the frame C. D D are the valve or steam chests. E E are the valve-rods, and are connected together at their outer ends. F F are the piston-rods or stamp-stems, and F F are the extensions of the piston-rods or stampstems through the cylinders A A. G G are adjustable cams, by means of the screw-thread on the upper end ofthe piston-rods F F. H H H is the lever for moving or working the valves when -operated on by the cams G G, and is connected with the valve-rods E E. J is the lug-plate, bolted iirmly to the cylinderheads, for the purpose of supporting the fulcrum-pin K. L L are the stamps. M M are the dies for the stamps to strike upon. O O are pipes for conveying off the exhaust steam. P P are the pipes for conveying the steam from the boiler to the cylinders.

The valves are of the style of the common slide-valve, and work over three portstwo of them for induction or supply ports, the other for the exhaust or educton port-they being the same on each cylinder.

The ports for each cylinder that admit steam into the cylinders below the piston are on the outside or farthest from the stuffing-boxes that the valve-rods pass through. Consequently, to admit steam into the cylinders below the pistons, the valve rods would have to be drawn out. The ports for admitting steam into the cylinders above the pistons are nearest the sides of the chests that the valve-rod stuffingboxes are on. Therefore, to admit steam into the cylinders above the pistons, each valve-rod would have to be pushed in.

The lever H H His forvworking the valves, and is composed of 'two arms on one side of the fulcrnin-pin and one arm on the other side. The portion of the leverthrough which the fulcrum-pin passes may be termed a hub, and

Vis as long as the distance from the center of the piston-rods F F to the center of the valverods E E. At the end of the hub that is opposite the center of the piston-rods are the two arms, extending up from the hub and' spreading suiciently to come within the limits of the projections on the cams G'G, that act as guides to keep the cams in the right positions, that the roller inside of the guides of the cams may act on the bent or slanted portion of the lever.

The upper portions of the two arms are bent or slanted from each other, or bent or slanted over the ends of the pistou-rods F F suflicient to give the valves the required throw or motion, when the piston-rods F F', with the cams G G on them, are on their upward motion,

bringing the roller in the cam G in contact head, and has, equidistant from the cylinders, *I

two lugs or projections extending upward and sufficiently apart to admit the hub of the lever longitudinally between the two. Thelugs have a hole through them corresponding to the hole through the hub, for the purpose of placing the strong pin K for the fulcrum of the lever H H H.

Having described the construction of the mechanism of my invention, I will now describe the operation of the same, and, that it may be more readily understood, I will designate one of the cylinders as the first side and the other as the second side.

When the machine or mechanism is at rest, or rather when no steam is being admitted to the cylinders, the stamps are resting on the dies M M, and, as the stamp-stems are the piston-rods, therefore both pistons will be at the lower ends of the cylinders.

For an illustration, I will suppose the last d piston that had steam above it to force it down when the steam was turned off was the piston of the cylinder of the second side. the lever H H H was pushed over toward the first side, when the piston of the second side made its last stroke before the steam was turned off. Consequently, the induction or feed port for supplying steam above the piston of the second side was left open, and the induction or feed port for supplying steam below the piston ofthe first side was left open also. Now, in that position, if steam should be turned on, the piston of the rst side would rapidly as cend until the cam G of that side came in contact with the bent or slanted portion of the lever H H H, causing it to move toward the second side sufficiently to move the valves to a reverse position, or rather to cut off the supply of steam below the piston of its own (first) side, and open the port for supplying steam above the piston of its own (first) side, causing the piston to be arrested or cushioned, and give it the downward pressure.

Therefore While the position ofthe valve of the first side is beingreversed, the valve-rods E E being connected causes the valve on the second side to be reversed also. Therefore the supply-port 'for admitting steam below the piston on the ing, it will come down with much greater velocity and finish its stroke before the cam on the rod of the piston of the second side reaches the bent portion of the lever to cushion and reverse the position of the valves, when the piston of the second side begins to descend, and the piston of the first side begins to ascend again, and so on alternately.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The construction of the lever H H H in the manner substantially as described, and for the purpose set forth.

2. The arrangement of the cams G G and lever H H H and fulcrum or lug-plate J with reference to the valve-rods E E.

FURMAN R. WILSON.

Witnesses JAs. C. MILLIGAN, CHARLES HAnMAs.

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