IMPROVEMENTS IN THROTTLING DEVICES FOR STEAM-CYLINDERS
Year: 1888

page_text: 1 GEORGE WASHINGTON CISCO, of Montvale, in the county of Bergen, and State
of New Jersey, United States of America, Engineer do hereby declare the nature of
my invention for IMPROVEMENTS IN THROTTLING DEVICES FOR STEAM-CYLINDERS
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement and accompanying drawings:-
-
This invention relates to devices for cutting off the supply of steam to steam-
cylinders.
The object is to produce a device for cutting off the supply of steam to cylinders
independent of the throttle-valve, so that should the throttle-valve become injured or
inoperative from any cause the supply of steam to the cylinder may be cut off in the
steam-chest, thereby rendering the further admission of steam to the cylinders
impossible; furthermore, to produce a device which, while being composed of a com-
paratively few number of parts, will be so adjusted and arranged as to render it at
once efficient and durable in use and comparatively inexpensive of production.
With these objects in view the invention consists in the combination, with a steam-
chest, of a compartment provided with suitable valves, each valve having a valve-stem
connected therewith and passing through stuffing-boxes secured to the ends of the
compartiment; furthermore, in a device for operating the valves to cause them to
close simultaneously when desired; and, finally, in the various novel details of
construction, as hereinafter fully set forth.
In the accompanying drawings, forming part of this specification, and in which like
letters of reference indicate corresponding parts,
Figure 1 is a side elevation showing the arrangement of the valves, the valve-
stem connected therewith, and the levers for operating the same.
Figure 2 is an end view showing the compartment secured in position on the
steam-chest.
Figure 3 is a detail view of draw-bar for operating the device from the cab, and
Figure 4 is a detail view of a device for connecting the two draw-bars. Fig. 5
is a sectional view of the cut-off valves and steam!chest.
Referring to the drawings, A designates a compartment or chamber, made of any
suitable material, but preferably of iron and mounted upon or in juxta-position to the

page_text: steam cylinder o. Within this chamber are placed two valves, B B¹, which are held
in proper position by means of guides or ways, secured to the inner edges of the
compartment. Each of these valves has respectively a valve-stem 2 63, attached to it,
the ends of which pass through and work in stuffing-boxes, secured to the
respective ends and 6 of the compartment or chamber A. To the end 66 a
standard, C, is secured, which extends some distance above the top of the com-
partment, and has at its upper end a bar or link, D, pivoted thereto, which
connects with a bar E. To the lower end of this bar is pivoted a link, F, which
connects with the valve-stem 2, and at a point above the standard is pivoted
another and a longer link, G, which connects with the valve-stem 63 at the opposite
end of the chamber.
H designates a rod, connected at one end to the bar E and at the opposite end
to a lever, I, see Fig. 3 the lower end of which is pivoted to the tread-board X of
the engine. At a point near the center of this rod is pivoted a draw bar, J, which
extends from that point to the cab of the engine. The pipe P is the steam inlet from
the boiler and the pipe Q is the exhaust to the blast pipe.
It is to be understood that each steam-cbest is provided with the cut-off dovice, and
may be operated from either side of the cab. It is desirous to so arrange the
mechanism that the steam may be cut off from both sides of the engine at one time.
To effect this, a bent rod, K, is employed, which passes over the boiler, and is
connected to the rod E, so that should the lover J be pulled back on either side of the
cab the valves in each of the chambers will be closed simultaneously.
The mode of operation is as follows:
The engineer, on seeing any approaching danger, draws the lever J back to the
position shown in dotted lines in Figure 3. This pulls the bar E back, which being
fulcrumed to the link D, would naturally push the valves towards each other in
the direction indicated by the arrows so as to slide over and close the ports L, M,
(Figs. 1 and 5) and thus cut off the supply of steam to the steam-chest N.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is:
1. In a device for cutting off the steam to the cylinders of engines, the combination
of the valves B B', the levers FG, connecting with and operating, respectively, the
valve stems 263, the movable fuleruin D, and the bar E, pivoted thereto, substantially
as described.
2. In a device for cutting off the supply of steam to the cylinders of engines, the
combination of the bar E, the rod H, pivoted thereto, and the bent lever K, for
connecting the levers on each side of the boiler, substantially as described.
3. The combination of the bar E, the rod H, pivoted thereto, the bent lever K,
for connecting the levers on each side of the boiler, the lever I, pivoted at its lower
end to the tread-board of the engine and at its upper end to the rod H, and the
draw-bar J, extending from the lever I to the cab of the engine, substantially as
described.
Dated this 5th day of November 1888
DUTTON & FULTON,
1, St. James Squaro, Manchester,
Agents.