US1958091A - Cylinder cock - Google Patents

Description

May 8, 1934. H. J. MQLAIN Err AL CYLINDER COCK Filed Feb. 15, 1932 F7 //VVEW7'0/P$ Harry I M L in H, Tr: v0! MLLain 5 y Ml Patented May 8, 1934 sr res PATENT OFICE CYLINDER COCK Application February 15, 1932, Serial No. 592,893

1 Claim.

5 acter, our improvement involving the use of a slide valve controlling the escape of water and steam from the cock casing and an actuating piston shiftable under variations between the pressure in the cock casing and that of a steam supply 1 acting upon the opposite face of the piston and shiftable also when steam is cut Off by resilient means acting to shift the piston and valve to valve opening position. These and other features of our invention will be best understood as described in connection with the drawing, in which we have illustrated our cylinder cock in what we believe to be its best form, and in which Figure 1 shows our improved cock in vertical section, and

Figure 2 is a plan view of the valve and of the interengaged portion of the spindle, indicated in dotted lines.

A indicates the cock casing, which may be attached to the engine cylinder in any convenient way. As shown, it is provided with a threaded upper end for such attachment. A chamber which when the cock is attached to an engine cylinder is in free communication therewith is formed in the casing, as indicated at A As shown, a lateral extension A of the casing is provided, which is internally threaded and. into which screws a cylinder B, which is in free communication with the chamber of the casing at one end and is provided with a steam inlet B at its outer end, 5 by which it can be connected with a steam pipe leading from the boiler and having of course a control valve in the cab, as is usual in such devices. The steam pipe with its boiler and valve connection are not shown and may, of course, be of any usual and obvious construction. C is a cylindrical socket piece secured in the wall of the casing opposite to and in alignment with the cylinder, said socket piece being shaped so as to provide an annular circumferential wall C to afford a seat for a spring. D is a closure secured to the lower part of the casing A, as shown by screwing on to the threaded lower end of the casing A. A port D is formed through the top of this closure, said port being in communication with an outlet passage D which is, as shown, directed laterally so that steam and water escaping from the casing will be delivered in a direction to give the least possible trouble. The upper surface of the closure D forms a flat slide Valve seat D surrounding the outlet port D E is a slide valve seated on the valve seat D and having extending from its upper surface two prongs, as indicated at E E Two such prongs should be provided and so located as to extend one on each side of the piston spindle, to be described, so as to align the valve with the spindle, said prongs being also spaced to engage with collars on the spindle, to be described. A spring socketE is also provided, as shown on the top of the valve, to support a coiled spring F, the upper end of which is in contact with the piston spindle. G is a piston working in the cylinder B, having as shown a spindle extension G extending across the chamber A and fitting in the cylindrical socket C. Extending from the spindle G are collars G G located so as to engage the prongs E extending from the valve. As shown, the rear collar also serves as an abutment for a spring H, the other end of which extends around the end of the socket piece and rests against the wall C G is a restricted passage extending from end to end through the piston G. When steam is shut off from the cylinder sufficient steam will pass through this restricted passage to prevent freezing of water which may have collected in the chamber A or connected parts. It will also be obvious that this passage may to a certain extent be utilized to facilitate the drifting of a locomotive.

It will be obvious that the action of the spring H will tend to shift the spindle and connected piston and the interengaged slide valve to positions in which the valve opens the port D It will also be obvious that the engine cylinder pressure will at all times exist in the chamber A and will tend to shift the piston spindle and valve to position to open the port. It will also be obvious that steam pressure admitted through the passage B will tend to shift the piston and connected parts so as to close the port D and as full boiler pressure is normally admitted to the cylinder this pressure will normally be effective to shift the piston to the position shown in the drawing and to close the valve. The effective areas of the opposite ends of the piston may of course be regulated in any convenient way to secure the opening and closing of the valve under any contemplated conditions. As shown, the effective area of the inner face of the piston is smaller than that of the outer end of the piston by reason of the extension from this face of the piston of the spindle G the outer end of which fits in the cylinder socket piece C. It will be obvious that the piston will move outward and open the valve whenever steam is cut off from the port B and it will also be obvious that whenever from any cause the pressure in the chamber A acting on the inner face of the piston exceeds the effective pressure acting on the outer face of the piston that the piston will move outward, opening the valve and permitting the escape of any water which may have accumulated in the chamber A or in the engine cylinder.

Our construction involving the use of the slide valve E for opening and closing the outlet port of the casing has distinct advantages in that this type of valve may be relied upon to maintain contact with its seat and to open and close its control port with precision and certainty. The valve is held against its seat by the pressure of the spring F and by the pressure existing in the chamber A of the casing, its interengagement with the spindle and its collars being such as to couple the valve with the spindle for longitudinal movement and for proper alignment with the spindle.

' The closure D should be connected with the casing A in such manner as to be angularly adjustable in its final position, thus permitting the direction of the outlet D to the most desirable position. As shown, this is effected by making the union between the closure and the casing a screw union and it will be obvious that the angular adjustment of the closure in no wise affects the seating and movement of the valve E.

While we have described our device as a cylinder cook, it will be obvious that it can be attached with advantage to any part of the steam line in which water may accumulate and from which the water should be eliminated at will.

Having now described our invention, what we claim as new and desire to secure by Letters Patent, is:

A cylinder cock comprising a casing attachable to the end of an engine cylinder having a chamber adapted to be in free communication with said cylinder, a horizontally disposed cylinder extending from the side of the casing, connected at one end to the casing chamber and connectable to a source of steam supply at its other end; a detachable closure for the lower end of the casing chamber provided with an outlet port extending through said closure and having a slide valve seat upon its upper surface surrounding said outlet port, a piston working in the cylinder connected with the casing chamber having an extension projecting into the casing chamber and extending over the valve seat, a slide valve working on the slide valve seat of the closure, movable between a position in which it opens the outlet port from the casing-chamber and a position in which it closes said outlet port and prevents the escape of fluid from the casing chamber, means loosely connecting the slide valve to the piston extension so that the valve will move with the piston extension, whereby an inward movement of the piston shifts the slide valve to close the outlet port and an outward movement of the piston shifts the valve to open the outlet port and resilient means acting on the piston to shift it to a position to open the valve.

HARRY J. MCLAIN. H. TREVOR MCLAIN.

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