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Патент USA US2108228

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Feb. 15, 1938.
Filed Jan. 5, 1935
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Patented Feb. 15, 1938
Ralph A. Light, Gynwyd, and Joseph W. Price,
J12, Philadelphia, Pa, assignors to The United
States Metaliic Packing Company, Philadel
phia, Pa.,‘ a corporation of Pennsylvania
Application January 3, 1935, Serial No. 244
1 Claim.
(01. 121-434)
Our invention relates to locomotive cylinder
cocks of the type shown and described in the
McLain Patent. 1,958,091, of May 8, 1934. In
cylinder cocks of this kind, which are adapted to
5 be secured to the ends of locomotive cylinders,
the casing of the cylinder cock which is in free
communication with the locomotive cylinder is
provided with closures through which is formed
an outlet or exhaust port opened and closed by
10 the movement of the slide valve moving on a
slide valve seat surrounding the exhaust port and
‘the valve is connected to and actuated by a piston
reciprocable in a cylinder extending through the
wall of the casing and connected at its outer end
the closure in which the exhaust port is formed in
such manner as to insure that the exhaust port
shall be properly aligned with the valve actuating
piston. In connection with our invention it is
desirable to provide an improved construction by
means of which the adjustment of a cap forming
with the bottom of the closure an exhaust cham
ber provided with a lateral outlet opening which
can be angularly adjusted so as to direct this out
let opening in what is considered the most advan- 10
tageous direction.
With the above objects in view we form the
exhaust port through the bottom closure of the
cylinder cock casing with a relatively long and
15 to a source of ?uid pressure such as the boiler
narrow cross-section and provide a slide valve 15
of the locomotive and the piston is moved in»
to open and close the exhaust port of similar
shape, though, of course, of such dimensions as
to extend over the edges of the exhaust port when
in position to close the port and we provide inter
engaging means between the closure and the low- 20
ward to close the valve or outward to open it in
accordance with the prevalence of the pressures
acting upon the inner and outer ends of the pis
20 ton, the pressure on the'inner end of the piston
being preferably supplemented by the resilient
or portion of the cylinder cock casing) which ‘will
pressure of a spring acting to move the piston
insure that the closure when adjusted in closing
‘outward and shift the valve to opened position
position with respect to the casing, will be so
aligned that the longitudinal axis of the exhaust
port will lie substantially at right angles to the 25
line of movement of the valve actuating piston.
when ?uid pressure is cut off from the outer end
25 of the cylinder. The movements of the piston
and connected parts are limited by abutments
so located as to be contacted as the slide valve is
closed or moved to fully open position. In the
practical use of such valves it has been found that
30 the sensitiveness and e?iciency of the apparatus
is at its best when the stroke of the actuating
piston and the travel of the slide valve are short
and also that the wear and tear on the moving
parts is greater where the travel of these parts
.35 is increased but it is important that a large ex
haust port be provided to insure a prompt evacu
ation of the cylinder cock and connected portion
of the locomotive cylinder and it is vone object
of our invention to provide a construction which.
‘10 will admit of the use of an exhaust port of ample
cross-sectional area while at the same time con
.?ning the motion of the moving parts of the ap
paratus within limits which have been found to
.give the best results with a minimum wear and
49 tear on the parts, particularly on the abutting
surfaces which limit their movement.
In apparatus of the kind to which our invention
relates it has been found desirable to connect the
exhaust port of the cylinder cock casing with an
exhaust chamber provided with a lateral open
ing which will direct the Water and steam issuing
from the casing when the valve is opened in such
direction as is found least objectionable and as in
55 our improved construction it is necessary to align
By preference we form the closure with a cylin
drical upper portion which ?ts in the lower end
of the casing and We provide in the inside of the
lower end of the casing a groove and on the cylin~ 30
drical portion of the closure a projection or pin
adapted to enter this groove and thereby insure
that the angular position of the closure shall be
such that the long axis of the exhaust port will
lie transversely to the line of motion of the valve 35
actuating piston. Below the cylindrical portion
of the closure we form the closure with a laterally
extending ?ange which ?ts against the bottom
end of the cylinder cock casing and against the
under side of this ?ange we ?t a peripheral flange 40
of a cap like member forming with the lower end
of the closure, which is preferably hollowed out,
an exhaust chamber and having a lateral open
ing which by an angular adjustment of the cap
piece can be made to direct the ?ow of water 45
and steam in any desired direction. By prefer~
once We secure the cap in position on the closure
and the closure in position in and on the end
of the casing by means of a union nut having a
?ange ?tting under the ?ange of the cap piece 50
and screwing upon the externally threaded lower
end of the cylinder cock casing although it should
be understood that we do not consider our inven
tion in its broad sense as limited to any particu
lar means for securing the parts together.
The apparatus and improved features which
constitute our invention will be understood as
further described in connection with the draw
ing in which
Figure 1 is a longitudinal section of the cylin
der cock taken on the line 1-4 of Fig. 2, and
Figure 2, a cross section taken on the line 2-2
of Fig. l.
A indicates the casing of the cylinder cock
10 having at its top an internally threaded pro
jection A1 adapted to be secured to a locomotive
cylinder. The lower end of the casing which is
of cylindrical shape is formed with an internal
longitudinal groove indicated at B with a ma
15 chined end portion indicated at B1 and with an
outer threaded portion indicated at 132. C in
dicates a cylinder extending through the wall
of the casing with an inner end opening into the
casing and an outer end adapted to be connected
to a source of ?uid pressure, preferably the boiler
of the locomotive through a conduit, an end por
tion of which is indicated at 01. D indicates a
piston working in the cylinder‘ and having a
piston rod extension from its inner end, indicated
at D1, which piston rod extends across the cas
ing A and is supported at its end as indicated
at E and engaged by a spring E1 which applies
constant resilient pressure, tending, through the
piston rod, to force the piston D outward in its
3O cylinder C.
D3 is an annular shoulder formed on
the piston rod D, which, when the moving parts
are actuated to close the valve G, abuts against
a shoulder E‘2 on the guide E. The movement of
the parts in the opposite direction to open the
valve is limited by the abutment or the piston
D against the outer end of the cylinder C. F
indicates the bottom closure of the casing A
which is preferably formed, as shown, with a
cylindrical portion F1 adapted to fit in the cylin—
drical end of the casing and terminating in a
?ange F2 adapted to ?t against the end B1 of the
casing. A port F3 is formed through the closure
which, in accordance with our present invention,
is long and comparatively narrow and we provide
on the outer cylindrical portion of the closure a
pin or projection indicated at F4 which, when the
closure is assembled with the casing, is adapted
to‘ enter the groove B and so align the closure
that its longitudinal port F3 will lie with its longer
diameter at right angles to the line of travel of
the piston D.
The upper face F5 of the closure
is machined so as to form a seat for a slide valve
and the slide valve working on this seat, indi
cated at G, is given a comparatively long and
narrow form to correspond with the form of the
port through the closure and is interengaged with
the piston rod D1 as by means of projections G1
interengaging with shoulders D2 formed on the
piston rod. A spring G2 interposed between the
60 top of the slide valve and the piston rod serves
to press the valve against its seat. H is a cap
having a peripheral ?ange H1 adapted to ?t
against the ?ange F2 of the closure having a lat
eral outlet opening indicated at H2. ~ J is a union
nut having a ?ange J1 adapted to extend over
the flange H1 of the cap and internally threaded
to screw upon the threaded portion B2 of the
cap piece as shown.
In assembling the apparatus, the piston and
iston rod extension D and D1 are inserted
through the cylinder C, the slide valve inserted
through the bottom opening of the casing and
interengaged with the piston rod. The closure F
is then inserted with its cylindrical portion Fl
75 extending into the bottom portion of the casing
and its pin F4 inserted in the groove B, thus prop
erly aligning the port F3 and the upper portion
of the ?ange F2 resting on the end portion B1 of
the casing. The cap piece H is then placed over
the end of the closure with its flange H1 lying in
in contact with the lower portion of the ?ange
F2 and the cap piece having been angularly ad
justed so that its lateral outlet H2 will lie in the
desired direction, the union nut J is screwed upon
the threaded end B2 of the casing until its ?ange 10
J1 is screwed down upon the ?ange H1 of the cap
piece, clamping it against the ?ange F2 of the
closure and clamping the ?ange F2 against the
bottom of the casing.
It will be understood that the casing A is in
free communication with the end of the locomo
tive cylinder and that when no pressure is ex
erted against the outer end of the piston D, such
pressure as may exist in the casing as well as the
resilient action of the spring E1 acting on the 20
inner end of the piston will force it outward with
the result that the slide valve G is shifted to a
position to open the longitudinal port F3 and per
mit any water and steam in the casing A to
escape and that by a proper adjustment of the
cap H such escaping ?uid may be given any di
rection which is thought desirable‘. When high
pressure fluid, such as steam from the boiler is
admitted through the pipe C1 to the outer end
of the cylinder C, the piston D is forced inward,
shifting the slide valve G to a position to close
the elongated port F3, thus preventing the
escape of ?uid from the casing unless the pres
sure inside of the casing and acting against the
inner end of the piston D, shall temporarily ex
ceed the pressure acting on the outer end of the
piston as will be the case if condensed water from
the engine cylinder shall ?ll the casing A and ac
cumulate to some extent in the end of the loco
motive cylinder. In such case the slide valve G 40
will be moved to open position, permitting the
escape of accumulated water, after which escape
pressure conditions will become such as to again
close the exhaust slide valve G.
It will be noted that by providing a relatively
long and narrow exhaust port in the bottom clo
sure with a correspondingly shaped slide valve to
open and close the port that it is practicable to
form an exhaust port or" large cross-sectional
area which can be opened and closed by a rela
tively short movement of the slide valve and a
correspondingly short stroke inward or outward
of the piston controlling the movements of the
slide valve and it has been found that by so lim
iting the movements of the moving parts that a
material advantage is gained both in the opera
tive functions of the apparatus and in the avoid
ance of wear and tear on the moving parts par
ticularly on the abutting surfaces which limit
the movement of the parts to open and close the 60
valve. Again, it is thought desirable by users of
cylinder cocks of the general character in ques
tion to provide means for directing the exhaust
in what is considered the least objectionable di
rection and by providing an angularly adjustable 6-5
cap piece with a lateral outlet together with
means, such as the union nut, for clamping the
cap piece to the ?ange of the closure against the
bottom of the casing. This requirement is very
satisfactorily provided for.
Having now described our invention, what we
claim as new and desire to secure by Letters
Patent is:
in a locomotive cylinder cock of the type com
prising a casing, a separable closure for the lower 75
end of the casing having an exhaust port and a
slide valve seat upon its upper surface, means for
bottom closure as an elongated and comparatively
narrow opening, forming the bottom closure and
securely clamping the closure to the bottom of the lower end of the casing with interengaging
the casing, a cylinder extending through the wall means whereby the bottom closure will be so
of the casing and adapted to be connected to a aligned that the elongated exhaust port will be 5
source of‘ ?uid pressure at its outer end, a piston
so disposed that its longer dimension will lie
working in said cylinder and a slide valve con
nected to be actuated by said piston and working
transverse to the line of movement of the pis
on the slide valve seat on the upper surface of
10 the bottom closure in which the movements of
the piston and valve are limited :by abutments
contacted at the end of each piston stroke to
open or close the valve, the improvement which
consists in forming the exhaust port through the
ton and combining therewith a comparatively
long and narrow slide valve adapted to open and
close the exhaust port as the piston is actuated 10
in one direction or the other.
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