US316236A

US316236A - church

Info

Publication number: US316236A
Authority: US
Publication date: 1885-04-21
Anticipated expiration: 1902-04-21

Description

3 sheets -snin 1.

G. CHURCH. GIRGULAR SLIDE VALVE.

(No Model.)

No. 316,236. Patented Apr. 21., 1885;

Mi /anion Wier 0, Wren (7 z'lzwaaea (No Model.) v 3 Sheets-Sheet 2.

CIRCULAR SLIDE VALVE. I No. 316,236. Patented Apr. 21, 1885.

Jinn/6797021 Z WZ-Zvidtuw 3y N, DETERS, Pholvbflwgrapher. Walhmglnn. D. C.

(No Model.) 3 Sheets-Sheet 8. W.- O. CHURCH. I

CIRCULAR SLIDE VALVE.

Jul 11 UNTTER STATES PATENT @EFTQE.

WALTER OHARLEs Hu OH, OF BBIXTON, COUNTY OF suR ASSIGNOR To THE WALTER O. OHUROH ENGINEERING OOMPANY, (LIMITEDQ OF LONDON, ENGLAND.

CIRCULAR SLIDE-VALVE.

SPECIPICA'IIbN forming part :of Letters Patent NO. 316,236, dated April 21, 1885.

Application filed June 10,1884. (No model.) Patented in England Jar iuary 31, isse,No. 47s; in France July 26,1882,1N0.150,32l;

in Belgium July 29. 188i1,-N0. 58,616, in Germany July 30, 1882, No. 21,544, and inAustria October 11,1882, No. 1,896.

.To all whom it may concern.-

Be it known that I, WALTER GHARLEs CHURCH, a citizen of England, residing at Brixton, in the county of Surrey, England, have invented a new and useful Improvement in Circular Slide-Valves and the Ports and Cases thereof, (for which I have obtained patents in Great Britain, No. 476, dated'January 31, 1882; in France, dated July 26, 1882, No. 150,321; in Belgium, dated July 29, 1882, No. 58,616; in Germany, dated J uly 30, 1882, N0. 21, 544., and in Austria, dated October 11, 1882, NO. 1,896,) of which the following is a specification.

In the specification accompanying my application for Letters Patent of even date herewith I describe means of causing circular slidevalves to turn round within the loop or eye of the slide-rod which moves them to and fro, so as to insure equality of wear of the rubbing-surfaces. My present invention relates to the construction of such circular slides and the ports and cases thereof, so as to relieve a great part of the pressure on them, to provide against their edges catching against the edges of the ports, and to prevent the deformation of the cylinders to which they are applied by the pressure within the slide-case, as I will explain, referring to the accompanying drawings.

Figure 1 is a longitudinal section, and Fig. 2 a transverse section, of part of a cylinder, with a circular slide and its case, according to my invention. Fig. 3 is a plan showing the ports governed by the circular slide. Fig. 4 is a plan of the central bearing-piece for relieving pressure on the slide. Fig. 5 is a plan, and Fig. 6 is a side view, of the slide and the loop or eye of the slide-rod which embraces it. Fig. 7 is a longitudinal section showing a modified arrangement for keeping the slide against the cylinder-face. Fig. 8 is a longitudinal section showing a modified form of tie for the case of a large slide. Fig. 9 is a plan-showing the ports governed by the slide. Fig. 10 is a. plan of the central bearing-piece for relieving pressure on the slide. Fig. 11 is a plan, and Fig. 12 a side view, of the slide and the loop or eye of the slide-rod.

In all the figures similar parts are marked by similar reference-letters.

AIA are th'e'crescent-shaped ports, over which the slide travels. In order tosupport theedges of the slide as they move over the ports, and to prevent them from deflecting, so

as to catch against the edges of the ports, I introduce in each port a central rib, a,'as

erable part of the pressure forcing it against the cylinder-face, I providea central bearingpiece, B, projecting up from the cylinder and spreading out in mushroom form, presenting on its upper face a surface, on which works a facing within the back of the slide S. The piece B has its upper surface made with. a somewhat elliptically-shaped hollow, b, with two central side parts of the surface at b b, widened out, as shown in Figs.4 and 10, to present greater surface where the rubbing is most constant, and thus insure greater uniformity of wear. The bearing-piece B is bolted to the side of the cylinder, engaging under it, as

shown in Figs. 1, 2, and 7, the head of a strong bolt, 0, which extends up through a central hole of the slide and through a hole in the cover of the slide-case, on which is screwed a nut, c. The bolt 0 acts as a tie, connecting the cover of the slide to the cylinder, so that the downward pressure within the slide case, which tends to deform the cylinder by press ing it inward, is counteracted by the upward pressure on the cover of the slide-case.

Instead of a single bolt 0, several such bolts may be employed; or the bearing-piece B may be made with a tubular part, B, extending upwardand bolted to the cover of the slide-case,

the periphery of the slide, causing it to turn a little round, always in the samedirection at every reciprocation. As shown in Figs. 1, 2, and 8, I form in the surfaces D grooves d, into which enter the sides of the loop or eye F, portions of which are made straight, so that the loop or eye being thus guided is prevented from exerting any twisting action on the slide in case external parts of the slide-rod B should be subjected to torsive strain. As shown in Figs. 5 and 6, I connect the pins of the rollers E E by a spring-guard, G, which presses on the middle of the back of the slide, keeping it steadily bearing against the cylinder-face. This guard is made with a slotted hole, 9, to clear bolt 0 as the slide reciprocates.

As shown in Fig. 7, instead of the springguard G, a disk, G, is fitted on the bolt 0, this disk being pressed down by a helical spring adjustable by a nut, 0. As shown in Figs. 11,

and 12, the spring-guard G is bolted to the} loop or eye F where the rods R join it, and is i made with an elongated hole, g sufficiently large to clear the tubular tie B. 4 Having thus described the nature of my invention and the best means I know of carrying it into practical operation, I herebyde-i .forth.

3. The slotted disk G, in combination with the helical spring and the adj usting-nut C on the central tie-bolt,C, for the purpose of holding the slide down on its facing, substantially as described.

In testimony whereof I have signed my .name to this specification, in the presence of two subscribing witnesses, this 6th day of May, A. D1884.

O. CHURCH. Witnesses:

JNo. P. M. MILLARD, J. WATT.