US780100A - Steam-actuated valve. - Google Patents

Description

PATENTBD JAN. 17, 1905. l o. GRSSLER.

STEAM ATUATBD VALVE.

APPLIUATION FILED JUNE ze, 1903.

s SHEETS-SHEET 1.

No. 700,100. PATENTED JAN. 17, 1905. 0. GRSSLER.

STEAM AGTUATBD VALVE.

APPLIUATION FILED JUNE 26.1903.

2 SHEETS-SHEET 2 llNTTE STaTEs Patented January 17, 1905.

PATENT OEEICE.

STEAM-ACTUATED VALVE.I

SPECIFICATION forming part of Letters Patent No. 780,100, dated January 17, 1905.

Application filed June 26, 1903. Serial No. 163,272.

To n/ZZ ufl/1.0m it may cm1/cern:

Be it known that l, OswALD GEssLER, a subject of the King o1' Saxony, and a resident of 1 Quandstrasse, Leipsic-Schleussig, in the Kingdom of Saxony, German Empire, have invented certain new and useful Improvements in Steam-Actuated Valves, of which the fellowing is an exact speciiication.

My invention relates to improvements in steam-actuated valves for engines without 'iiywheels, and more especially to engines possessing two slide-valves, one of which is moved by means of the engine itself, whereas the' other one is moved directly by means of the steam, the movement of this second slide bcing governed by means oi' the iirst one.

rlhe purpose of the invention is to provide a construction by means o'tl which it is attained that the moment o't' the beginning of the steam admission, as well as the moment of closing the same--that is to say, the moment or' the beginning of the expansion o1 the samecan be changed at will, thereby creating an engine which can be easily governed.

1n order to make my invention more clear, I refer to the accompanying drawings, in whichw Figure 1 is a longitudinal section ol the working parts o'lI the engine. Figs. 2 and 3 show the same parts in another position. Fig. 4 shows a modiiication of the construction shown in the preceding figures. Figs. 5 and 6 show the device for effecting that the valves et' the pump driven by means of the engine have suflicient time to close.

In the construction shown in Figs. 1 and E2, (t is the steam-cylinder. is a piston situated within the same. c is the piston-rod. Z (,Z are the steaminlet ports. e e are the steam-outlet ports. nels ff2 for the steam admission and a channelj223 for the exhaust-steam. r1`he slide-valve 'f is moved by means of a second slide-valve g, which, as may be seen from the drawings, is E-shaped. rl`he slide y is moved by means of the slide-valve rod y'. The slide-valve rod g is connected, by means oi. a link g2, to a lever la, connected at 7L to the piston-rod c.' For changing the movement et' the slide-valve g the point in which the link g2 is connected to the lever la. may be adjusted by thc arf is a slide-valve provided with chani rangement of a slot lf. The slide g consists, as may be seen from the drawings, of two separate parts that is to say, the part g and the part g". These parts are both connected, by means of threads, to the slide-valve rod g in such manner that by turning this slid e-valve rod by means of a hand-wheel (shown in Fig. 1 of the drawings) the distance between the parts g and ffl can be changed.

The eliect of the device is as follows: It' steam is admitted into the valve-chest fi, the steam will in the position shown in Fig. 1 llow through the part 1301i the slide y and the channels f2 and d into the cylinder t and will move the piston 7) in the direction otl the arrow. As thc slide g is connected, by means or' the valve-rod g', the link g2, and the lever to the piston-rod c, this slide-valve g will t'ollow the movement oil the piston 7). As soon as the slide g arrives in the position shown in Fig. 2 the steam admission is cnt olli, and the steam in the cylinder t begins to expand. lt the slide y] arrives in the position shown in Fig. 3, the steam will iiow through the part g" of the slide g into the channelf'. As this channel f is in this position with the slide f closed on its lower side, as may be seen from Fig. 1, the steam cannot liow into the cylinder. ln the slide f small channels f3 fi are provided, which connect the channels f/ f2 with small spaces and f. if now the steam enters the channel f', it will iow through the channelf" into the spacef, and will consequently press the slidefto the right-hand side, so that the same adopts the position shown in Fig. 3. In this position the steam llows from the admissionchamber through the part g" olE the slide g, the channel j", and the channel d behind the piston and drives the same :forward in the direction of the arrow shown in Fig. 1. During this Vforward moven'ient the slide g/ moves also forward until the part g otl the same arrives in the position in which the steam can liow into the same. As soon as the steam is admitted to the part g the steam will ilow through the channel f1 to the space f" and will bring the slide f into the position shown in Fig. 1. ll" the cylinder moves in the direction indicated by the arrow in Fig. 1, the exhaust-steam liows through the channels l and f2;i to the exhaust e', while if the piston Tool moves in the opposite direction the exhaust l nel flows through the channel d and f23 to the exhaust e. In one cylinder-engine in which the steam exhausts it is not necessary to arrange two exhaust-ports e and ef; but it is sufiicient to arrange only one exhaust,as shown in the modification in Fig. 4. In this modification the slidef is provided with bores fffs, into which pistons f f 1 are fitted. rIhe spacesfl and f, into which flows the steam for moving the slide f,are in this construction situated at `the end of the pistons fg and f1". It will be seen from the drawings that the baseplates fu and f 12, as well as the ends of the slide f, are not exactly fitted into the valvechest, but have sufiicient play for allowing an adjusting of the same in case of the sliding' surfaces wearing out. In the construction shown in Fig. I special cylinders fw and fu, having some play in the valve-chest, are provided for allowing of wearing out. If the expansion shall be changed, this can be easily effected by adjusting the point in which the link g2 is fixed to the lever L, which changing is effected by means of the slot 7a2. A further changement of the admission can be attained by changing the position of the slide g by means of the screw g5.

By changing the movement of the slide g and simultaneously changing the distance between the parts and g* of the slide g an exact adjusting of the expansion can take place, which was not the case in the constructions hitherto known. The combination of these two adjusting' means therefore forms the main part of the invention.

In order to attain that the steam in the spaces f5 and f6 can escape if the slide f is moved a small channel f is provided. This channel connects in the position shown in Fig. l the space f5, by means of the channels f3 and f', the passage gf, and the channelfg, to the exhaust e. The construction is, however, such that this connection is interrupted before the slidef arrives in its end position, so that the steam still contained in the spaces ff and f6 forms a buffer for the slide f, hereby avoiding shocks in the movement of the same.

In Figs. 5 and 6 an arrangement is shown for avoiding that the piston can push against the cylinder-covers and for attaining that the piston moves slowly at the end and beginning of the stroke, which is very important in case the engine is used for driving pumps, as by this means the valves have sufficient time to close.

As will be seen from the drawings, the ends of the admission-channels Z and d are situated in a certain distance from the cylindercovers. la It are branch channels connected to the channels Z d', the ends of which channels are situated directly at the cylinder-covers. In the position shown in Fig. 6 the piston L just closes the channel (Z. If the piston now moves in the direction of the arrow, the steam 1n the space Z must fiow out through the chan- Now this channel is made so narrow that the steam can only slowly escape, hereby effecting' that the piston moves slowly near its dead-point. In consequence hereof the valves of the pump driven by means of the engine have sufHcient time to close, and the piston will never push against the cylindercover. If now the valve f has been moved, the steam must at first enter through the small channel and the backward movement of the same will therefore also begin slowly until the piston has passed the end of the channel d.

Having thus fully described the nature of my invention, what I desire to secure by Letters Patent of the United States is- 1. In a steam-engine, the combination of a cylinder, a piston situated within the cylinder, a slide-valve provided with two steam-admission channels, means for moving this slidevalve by the steam in the steam-chest, a second slide-valve situated upon the first one, said second slide-valve consisting of two parts, one of which is situated so as to open and close during the movement of this slide-valve one of the steam-admission channels of thel first slide-valve, the second part being situated so as to open and close during the movement of the slide-valve the second steam-admission channel of the first slide-valve, with means for changing the distance between these two parts, means for moving the second slide-valve from the piston-rod of the'engine, and means for changing the movement of the second slide-valve, substantially as described and for the purpose set forth.

2. In a steam-engine, the combination of a cylinder. a piston situated within the cylinder, a slide-valve provided with two steam-admission channels, means for moving this slidevalve by the steam in the steam-chest, a second slide-valve situated upon the first one, said second slide-valve consisting of two parts, one of which is situated so as to open and close during the movement of this slide-valve one of the steam-admission channels of the first slide-valve, the second part being situated so as to open and close during the movement of the slide-valve the second steam-admission channel of the first slide-valve, with means for changing the distance between these two parts, means for moving the second slidevalve from the piston rod of .the engine, means for changing the movement of the second slide-valve, and means for retarding the movement of the steam-piston near the end of each stroke, substantially as described and for the purpose set forth.

In testimony whereof Ihave signed my name to this specification in the presence of two subscribing witnesses.

OSVALD GRASSLER. iVitnesses:

RICHARD SCHUHMANN, GEORG ALBREGHT.

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