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Патент USA US2106484

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Jan. 25, 1938‘.
E. E. HEWITT
.
2,106,484 ‘
e‘,
'
ljUPLEX BRAKE‘CYLINDER
Filed Feb. 27, 1957
2 Sheets-Sheet 1
2.
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ELLISE.HEWITT
BY
ATTORNEY.
Jan. 25', 1938.
2,106,484
E5. HEWITT
DUPLEX BRAKE CYLINDER
Filed Feb. 27, 1957
>
2 Sheets-Sheet '2
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OR.
51.1.15 E._HEW ITT
BY
-
.
ATTORNEY.
Patented ‘Jan. 25, 1938
2,106,484 '
UNITED STATES
PATENT OFFICE»
2,106,484 _
DUPLEX BRAKE CYLINDER
Ellis E. Hewitt, Edgewood, Pa., assignor to The
Westinghouse Air Brake Company, Wilmer
ding, Pa., a corporation of Pennsylvania
Application February 27, 1937, Serial No. 128,086
7 Claims.
This invention relates to duplex cylinder mech
anisms such for instance as duplex brake cyl
inder mechanisms for use in ?uid pressure brake
equipments.
.
The principal object of the invention is to
provide an improved duplex cylinder mechanism
having two axially aligned cup-shaped pistons
adapted to be moved in opposite directions in a
cylinder casing having a novel pressure head
10 construction between the pistons to provide a
(circa-2) . '
nection with the casing. It will here be un
derstood that the plug and pipe I‘! are inter
changeable so as to accommodate different pip
ing arrangements.
'
'
Each header end wall is also provided with "5
screw-threaded openings ill for theireception of
bolts when it is desired to secure the supply and
release pipe ,I‘! to the header by means of the
well known reinforcing pipe ?anges, not-shown.
The pistons may each be of the same con- 10
stop for each piston and to also provide a pres-‘
‘struction
as those shown in Patent No. 2,055,104,
sure chamber of minimum volume between the’
issued September 22, 1936 to William C. Lan
pressure sides of the pistons.
Other objects and advantages will appear in dis and myself. Brie?y described, each piston
the following more detailed description of the may comprise a cup-shaped piston head l9 hav
invention.
.
ing mounted thereon ‘correspondingly shaped 15
packings 20 of the snap-on type having an an
In the accompanying drawings, Fig. 1 is a lon
gitudinal sectional view of a duplex cylinder nular thickened portion 2| which is located near
the ,outer edge portion of the packing. Each
mechanism embodying the invention, and Fig. 2 v piston
is'provided with a hollow‘piston rod 22
is an enlarged cross-sectional view of the mech
in which there is pivotally mounted, in the usual 20
anism taken on the line 2-2 of Fig. 1.
As shown, the duplex cylinder mechanism manner, a push rod 23 which extends'through
comprises axially aligned oppositely movable a centraiopening in the non-pressure head 24
cup-shaped pistons I and 2 which are slidably secured to the cylinder casing. Interposed be
tween and engaging the piston and non-pres
mounted in longitudinally aligned cylinder cas
ings 3 and 4, respectively. The adjacent ends sure head is the'usual release spring 25.
Each non-pressure head 24 is provided with
of these cylinder casings ‘are integrally connect
the usual breather opening 26 in which there
ed together by an annular pressure head con
is interposed the usual air strainer 27.
>
struction 5 which, as shown in Fig. 1 is V
"When the pistons i and 2 are moved to their
30 shaped in cross-sectionpthe walls ii and ‘l of the
construction extending inwardly between the normal release‘ position as shown in Fig. 1 the
thickened portions 2! of the piston packings en
pressure faces of the pistons and converging to
ward each other and constituting stops for the gage the pressurehead of the cylinders and the
pistons. These walls merge into each other some pistons are brought to a stop by such engage
ment. Heretofore in duplex cylinder mecha
35 distance from the longitudinal axis of the cyl
inders so as to provide an opening 8 of fairly
nisms the piston rods have been provided with
large diameter which constantly connects the
stops which engage with the non-pressure heads
of the cylinders to arrest the movement of the
pressure chambers 9 and iii of the cylinders 3
and 4 respectively.
Extending between and integral with the walls
8 and 1 are spaced radially arranged longitudi
nally extending strengthening ribs ll. Also ex
tending between and integral with these walls is
a header l2 which extends outwardly into the
pistons in their normal release positions. By
utilizing the pressure head construction 5 as a
stop for the pistons the non-pressure heads are 40
relieved of this 'o?ice and as a result such heads
may be made lighter than would otherwise‘ be
the
case.
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45 plane of the outer surface of the cylinder cas
While one illustrative embodiment of the in
ing, the outer end of the header being provided ‘ vention has been described in‘v detail, it is not
with end walls l3 and I4. Each end wall is my intention to limit its scope to that embodi- _
provided with a threaded opening which is in
communication with a fluid- pressure supply and
release passage l5 leading 'to the‘opening 8.
.As shown in Fig. 2, the opening in either one
of the header walls is adapted to i be either
closed by a, plug l6 which‘ may be screwed into
the wall or to accommodate a. supply or release
pipe I? adapted to have screw-threaded con
ment or otherwise than by' the terms of the ap- '
.Dended claims.
Having now described my invention, what I
claim as new and desire to secure by Letters Pat
ent, is:
-
1. A‘ unitary cylinder casing comprising two
longitudinally spaced axially aligned cylinder por
tions and an annular head'V-shaped in cross- .IB
2,106,484
2.
section ‘and integrally connecting said- cylinder
portions.
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'
'
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.
2. A unitary cylinder casing comprising two
longitudinally spaced axially aligned cylinder
portions and an annular head V-shaped in cross
section and integrally connecting said cylinder
portions and de?ning an always open communica
tion between both of said cylinder portions.
3. A unitary cylinder casing comprising two
10
longitudinally spaced axially aligned cylinder
‘portions,’ an annular head V-shaped in cross
section and integrally connecting said cylinder
portions; and radially arranged longitudinally
extending strengthening ribs integral with said
15
cylinder portions.
4. A unitary cylinder casing comprising two
longitudinallyv spaced axially aligned cylinder
portions having two integral annular wall por
tions which extend inwardly toward the longi
tudinal
axis of the cylinder portions and which
20
converge toward each other and merge together
about, but spaced away from, the longitudinal
axis of the cylinder portions.
5. A unitary cylinder casing comprising two
25
longitudinally spaced axially aligned cylinder por~
tions having two integral annular wall portions
which extend inwardly toward the longitudinal
axis of the cylinder portions and which converge
toward each other and merge together about, but
spaced away from, the longitudinal axis of the
cylinder portions, and radially arranged strength—
ening means extending between and integrally
' connected with said annular wall portions.
6. A unitary cylinder casing comprising two
longitudinally spaced axially aligned cylinder
portions having two integral annular wall por
tions which extend inwardly toward the longi
tudinal axis'of the cylinder portions and which
converge toward each other and merge together
about, but spaced away from, the longitudinal 10
axis of the cylinder portions, the merging por
tions of said walls de?ning a communication al
ways open to both cylinder portions, a header
disposed between said walls having a passage
through which ?uid under pressureis adapted to 15
be supplied to and released from said communi
cation and thereby said cylinders.
7. A unitary cylinder casing comprising two
longitudinally spaced axially aligned cylinder
portions having two integral annular walls which 20
extend inwardly toward the longitudinal axis of
the cylinder portions and which converge toward
each other and merge together about, but spaced
away from, the longitudinal axis of the cylinder
portions, a header integrally connected to said
walls and having a passage through which ?uid
under pressure is adapted to be supplied to and
released from said communication.
ELLIS E. HEWITT.
30
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