US104659A - John stoker - Google Patents

Description

claimt sans,

@JOHN sronnn, or rnnKsKI'LL, New -YoRK.

Letters Patent No. 104,059, dated June 21, 1870; catala-tell June 9, 1870.

l STOP MOTION FOR STEAM-ENGINES.

` The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern: l

Be it known that I, J cnn Sronnn., of` Peekskill, in the county of .Westchesten State of New York, have invented a new and useful Improvement in Stop Motion for Steam-Engine; and I do hereby declare the following to be a full, clear, and,exact description thereof', which will enable those skilled in the art to :make and use the same, reference being had ,to the accompanying drawing forming part o'f this 'specificais a transverse vertical section of the blowing-engines, but it is also applicable to steam-en! gines of any otherdescription; and

It consists in the arrangement of a spring piston exposed to the pressure of the blast in the blast-pipe,- and serving as alstop'for the damper or valve in said.

4blast-pipe in such a manner that, when fromv some cause the pressure ofthe blast-pipe is suddenly decreased, the stop of the valve is automatically withdrawn and the valve is closed, thereby maintaining sufficient pressure in the blast-pipe'and blowingLcylinder to prevent the piston or plunger, working in said cylinder, from smashing against they cylinderheads.

The invention consists, further, in connecting the spring piston, which is exposed to the pressure of the blast in the blast-pipe, orto the pressure of a duid in a pipe applied jto the engine for this particular purp'ose, by suitable levers, with the throttle-valve in the `steam-supply pipe in such a manner that, whenever the pressure in the blast-pipe, or its equivalent, decreases below a certain limit, the `supply of steam to the steam-piston .is cut oli, andthe engine is prevented from racing.

llhe letter A designates the blast-pipe of a direct acting blowing-engine, and in this'blast-pipe is a valve, B, which4 is mounted. on a pin, a, that has its bearings in the sides of the blast-pipe. l

On one end of this pin, outside the pipe, is secured a segmental lever,- C, which is loaded with a weight c, so that said lever, when allowed to follow the ac tion .of its inherent gravity, will close the valve( To the side of the blast-pipe A is secured a cylinder,

D, which communicates, by a pipe, 11,' with the blast pipe, and which is fitted with4 a piston, E, secured to l a'rod, e.

This piston is exposed to the action of a spring, f, which has a tendency to pull the same down, and the piston-rod e projects above vthe upper cylinder-head,

and carries a cross-h cad, g, which forms thebearings for two guide-rollers h, and for a friction-roller, (i.

The guide-rollers it are grooved, and bear against rods j, which rise from the cylinder-head.

When the engine is started, the valve B is thrown open to the position indicated in dotted lines in the drawing, and the pressure of the air in the blast-pipe, acting on the piston E, forces the same up against the action of itsspring, so that the friction-roller t' forms a stop for the valvelever C, and prevents the same from closing the valve.

In this position, the weight or pressure of the valvelever@ against the roller i is sustained by the guiderollers h bearing against the rods j, and thereby the piston-rod e is prcventedfrom b eing crowded out in a4 lateral direction, and the piston E :noves up and down without binding.

The tension of the spring f is so adjusted that it will be overcome by the ordinary pressure of l theblast against the piston E, but if, from some cause, the pressure ofthe blast in the blast-pipe is decreased below a certain point, the spring f draws the piston E down, and the lever G,`being relieved from the stop roller i, drops down and closes the valve. e

By thus closing the valve, the resistance of the air against th-e piston of the blowing cylinder' will be kept up, and said-piston is prevented from smashing against the heads of its cylinder,

The piston of the regulating cylinder D is also connected to the throttle-valve Fin the pipe G, which conducts steam to the steam-cylinder of the blowingengine. This connection is effected by an elbow-lever, It 7, one arm, 7s, of which connects with the cross-head on the piston-rod e, while its other arm, l, carries two,

studs on a, as shown in iig. 1 of the drawing.

If the piston E is down, the stud a bears againstthe bottom edge of a latch, o, which is connected toV the stem of the throttle-valve F, but as soon as the piston E rises, the -stud 'a descends and allows the notch p of the latch o to catch over the stud m, and the throttle-valve is opened,

If the pressure in the blast-pipe A is decreased below the desired limit, so that the piston E is drawn down by the action of its spring f, the stud n throws the latch out of gear with the-stud m, and a lever, H,

loaded with a weight, I, and connected to the stem of' the throttle-valve,closes said throttle-valve, and steam is cut oil' from the steam-cylinder of the blowing-enoine.

c By this arrangement, the engine is prevented from racing, if the pressure of the air in theblast-pipe de creases below a certain limit, and accidents or injury to the engine are prevented.

It is obvious that a pipe containing fluid under pressure, and serving the same purpose as the blast- 2. The regulating spring pistou E, in combination pipe A, may be applied in place of said blast-pipe, in. with the pipe A and throttle-,valve F, in the steamcombination with the above-described mechanism for pipe G ot' a steam-engine, substantially as set forth.

closing the tl1r0ttle-valve of a steam-engine automa- This specification signed by me this 24th day of ticaliy. August, 1869.

What I claim as new, ann nesire to secure by Letn JOHN STORER.

ters Patent, is-

l. The regulating spring piston E, in combination vfitnessesw with the blast-pipe A and its valve B, substantially as W. HAUFF, shown and described. E. F. KASTENHUBER.

Images