US890682A

US890682A - Throttle-valve.

Info

Publication number: US890682A
Authority: US
Inventors: George W Morris
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-06-17
Filing date: 1907-06-17
Publication date: 1908-06-16
Anticipated expiration: 1925-06-16

Description

2 SHEETS-SHEET 1.

PATENTED JUNE 16, 1908.

G. W. MORRIS. THROTTLE VALVE,

APPLICATION FILED JUNE 17, 1907.

No. 890,682. PATENTED JUNE 1'6, 1908.

G. W. MORRIS. THROTTLB VALVE,

APIPLIOATION FILED JUNE 17, 1907.

2 SHEETS-SHEET 2l {@o @o @o 0@ PATENT OFFICE.

GEORGE W. MORRIS, OF RACINE, WISCONSIN.

THRo'rTLE-VALVE.

Specification of Letters Patent.

Application led .T une 17,

Patented June 16, 1908. 1907. Serial No. 379,435.

To all whom it may concern:

Be it known that I, GEORGE W. MORRIS, a subject of the King of Great Britain, residing at Racine, county of Racine, State of Wisconsin, have invented certain new and useful Improvements in Throttle-Valves, of which the following is a specification, reference being had to the accompanying drawings.

In the operation of throttle valves, it is, of course, frequently desirable to move such valve graduallyT to regulate the quantity of steam'to the engine, but, as generally constructed, such valves can be so moved only with difhculty, owing to the frictional load ocasioned by the pressure of steam on the va ve.

It is the obj ect of my invention to provide a valve of this character that can be moved very easily and as gradually as desired, and I accomplish this object by the means illustrated in the drawings and hereinafter fully described.

That which I believe to be new will be set forth in the claims.

In the accompanying drawings Figure l is a vertical section through the valve and its casing and parts connected therewith, the section being taken in the direction of the travel of the valve. Fig. 2 is a vertical section taken at line 2 2 of Fig. l. Fig. 3 is a view, partly in section and partly in plan, the section being taken at line 3 3 of Fig. 1. Eig. 4 is a detail, being an enlarged perspective view of the main valve. Fig. 5 is a detail, being an enlarged perspective view of a supplemental valve that is mounted on the main valve.

In the several figures of the drawings, in which corresponding parts are indicated by like reference characters, A indicates a casing to which steam is admitted through the end a, such steam passing u through oppositely-located side-passages to the interior of the valve casing B, which valve casing is suitably secured by bolts c, or otherwise, to said casing A. Through the upper wall of the ca'sing A is formed a large port d through which the steam passes from the casing B to be conducted through the oppositely-located end openings e and f to the engine. This port d is controlled by a slide valve O mounted on a suitable seat and sliding between parallel guide-strips g preferably formed integral with the casing A.

At opposite sides of the valve C and rising vertically from the upper face thereof are walls h h, in which, as best shown in Fig. 4, are formed in the upper edges wide notches i fi, respectively, said notches being of the same size and located in the same relative ,t

positions in the two walls.

D indicates a rack-bar fitting in the notches i t" in the walls h h and free to be moved longitudinally in said notches, the direction of movement of said rack-bar bein@` in the d irection of travel of the main valve C. On the lower edge or face of the rack-bar D are formed two projections j lc, respectively, each adapted to engage, when the rack-bar D is reciprocated, with a supplemental valve seated upon the upper face of the mainvalve O. This supplemental valve is indicated by E and is movably held between guide-strips m m on the face of said main valve C. This supplemental valve E lies over and closes a port n formed through the main valve C, and which, in the construction shown (see Fig. 4), is in the form of a slot the ends of which are near the guide-strips m m.

F indicates a guard-plate formed on or secured to the inner face of the valve-casing B and rejecting over the rack-bar D, said guar( -plate being provided to prevent accidental vertical displacement of the rack-bar from its seat in the notches t' i.

G indicates a toothed sector secured against turning upon a shaft H. As shown, that portion of the shaft H that lies within the upper end of the valve-casing B is squared (see Fig. 2), and it is upon this squared portion of the shaft H that the sector G is removably mounted. The shaft H is suitably journaled at the upper end of the valve-casing B, one end of said shaft having a bearing in a suitable hollow cap I which is screwthreaded into an opening through one side wall of the valve-casing B.- At the opposite side of the valve-casing, the shaft H passes through a long stuiiing box J, the end of which screws into a similar sized opening as that in which the cap I is screwed. By this construction, it is evident that the cap I and stuffing boX J can be reversed in position so that the shaft H may project from either side of the device to adapt it for use in different positions. Upon the end of the shaft H that projects through the stufling boX J will be attacheda link or lever K, through which the shaft can be rocked to operate the valve mechanism.

In operation, with the parts as shown inv Figs. 1 and 2, and lsteam having been admitted through the passages described to the interior of the valve casing B, it is evident that, owing to the pressure of the steam upon the comparatively great area of the main. valve C, it will takey considerable force -to move said valve. The supplemental valve E, having avery much less area of surface exposed to the action of the steam, can of course be moved much more readily, and by the mechanism described such valve will be moved so as to open the port n before the main valve commences to move, and it is evident that when such supplemental valve is moved sufliciently to allow steam to pass through the port n such steam will exert an upward pressure against the main valve C, whereby the pressure upon the upper face of the main valve will be counterbalanced, to a large extent, so that it can be moved gradually and with ease. This primary moving of the supplemental valve is accomplished by the rocking of the shaft II, which, of course, carries with it the toothed sector G that is secured to its squared portion, and, through the engagement of the teeth of such sector with the teeth of the rack D, will cause such rack to be moved and will bring the downward projection k against the edge of the su pleinental valve so that said supple- :mentalD valve will move on the face of the main valve and uncover theport n. After this supplemental valve has uncovered the ort n, the other downward projection,- namely that lettered j,-will strike against the adjacent wall 71. on the main valve and move such main valve to the extent desired. so that steam can ass down through the port d, the main vzilve C moving easily at this time, owing, as before explained, to the counterbalanoing, in part, at least, of the pressure of the steam in the valve casing B by the steam pressure from below that had been previously admitted through the small ort n.

What I claim as my invention and desire .to secure by Letters Patent is z- 1. In a throttle-valve, the combination with a valve casing and a main slide-valve therein having a, port therethrough, of walls rising from said main slide-valve, a bar slidingly supported on said walls and having a limited movement thereon in the direction of travel of the said valve, a supplemental slide-valve on said main valve adapted to close said port in the main valve, means carried by said sliding bar adapted to successively move said valves, and means for moving said sliding bar.

2. In a throttle-valve, the combination with a valve `casing and a main slide-valve therein having a port therethrough, of walls rising from said mainvslide-valve and having notches formed in their upper edges, a bar slidingly mounted in said notches, a supplemental slide-valve on said main valve, means carried by said sliding bar ada ted to successively move said valves, anc means for moving said sliding bar.

3. In a throttle-valve, the combination ywith a valve casing and a slide-valve therein having a port therethrough, of a supplemental valve carried by said slide-valve and adapted to close said. port through the main valve, a sliding rack-bar having means for successively engaging the said valves, a gear for engaging the teeth of the rack-bar, andv means for moving said gear.

4. In a throttle-valve, the combination with a valve casing and a slide-valve therein having a port therethrough, of a supplemental valve carried by said slide-valve and adapted to close said port through the main valve, a sliding rack-bar having means for successively engaging the said valves, a gear for engaging the teeth of the rack-bar, a rock-shaft journaled in the said valve-casing, and means for rocking said shaft.

5. In a throttle-valve, the combination with a valve-casing and a main slide-valve therein having a port therethrough, of walls rising from said main slide-valve and having notches formed in their upper edges, a rackbar slidingly mounted in said notches and provided on its lower edge with two projections, a supplemental slide-valve on said main-valve, said main-valve and slide-valve being adapted to be engaged successively by said projections on said rack-bar, a gear for engaging the teeth of the rack-bar, and means for rotating said gear.

GEORGE W. MORRIS. Witnesses:

C. R. CARPENTER, HARVEY FORD.