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Патент USA US2137495

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Nov. 22, 1938. ‘
’
A. e. KERSHAW
2,137,495
' FLUID PRESSURE INDICATING DEVICE
Filed March 13, 1937
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INVENTOR
ARTHURGnKERSHAW
'
BY
MW 1
ATTORN EY
Patented Nov. 22, 1938
2,137,495
h= UNITED ‘ STATES PATENT OFFICE
‘
r
2,137,495
FLUID PRESSURE IND‘ICATING DEVICE
Arthur Greenwood- Kershaw, King’s Cross, Lon
?don, England, assignor to The Westinghouse Air ‘
‘ Brake Company, Wilmerding, Pa., a corporation
of Pennsylvania
Application Mathis, 1937’, Serial No. 130,751
In Great ‘Britain March 23, 1,936
3 Claims;
(01. 116-65) I
' This invention relates to indicating devices and
a, relatively short arm 16 of a sleevelike member
more particularly to devices for giving an indi
cation or signal when the ?uid pressure in a reser
voir, cylinder or other portion of a ?uid pressure
5 braking system or the like falls below or exceeds
'l'l carrying a signal arm IB, the lug l4 and the
a predetermined‘value, and the principal object
of the invention is to provide a novel device‘of this
type.
‘
.
‘
16 “According to the invention the ?uid pressure
relatively short arm J6 being in asub'stantially
vertical plane containing the axis 'of the cylinder ’
8, While the legs of the link 15, which is held in
position by means of ‘split, pins l9 extending
through the legs at the ends thereof, are sub-.
stantially horizontal. The sleeve‘ I1 is rotatably
mounted upon a stud‘b‘olt 20 extending substan
‘ indicating device comprises an oscillatable signal
arm which is arranged to be' moved from one in
tially parallel to the legs of the link l5 and se
dicating position to another by means ‘of a spring
in?uenced movable abutment operatively con
through the inner end of the ‘stud bolt 20 serving
to hold the sleeve I"! in position. A cover 2| is
H nected ‘to the‘signal arm and subject to the ?uid
i ' pressure conditions tobe indicated. The mov
able abutment may be constituted by a cylinder
containing'and slidably mounted on a ?xed pis
ton, and maybe subject to the ?uid pressure con
cured to the base plate I, ,a split pin 22 extending
secured to the base plate I by suitable screw-bolts
such'as 23, and, is provided in one edge with a
recess “,‘il'through which the arm [8 'is adapted
to freely move.
.
‘
The short arm l6‘ and the signal arm l8, are as
ditions to be indicated through a passage or pas
20 sages “leading through this piston to the interior
shown in the drawing, preferably formed inte
of the cylinder, the spring referred to hereinbe
fore being preferably of helical form and sur
rounding the external cylindrical wall of the cyl~
The interior or chamber 24 of the movable cyl
inder.
25
,
,
,
.
grally with the sleeve ll.
20
-
inder B at the right hand side of the piston body
3 is adapted to be in permanent communication
with any volume adapted to contain ?uid pres-1
[In the accompanying drawing. Fig. 1 is aper
s‘ure,jsuch for instance as a main reservoir 21 of a 25
tial‘ sectional ‘view of a signalor indicating device
embodying the invention, the base plate of the
thrpugh‘th'e lugbr web 2 of the base plate I, an
‘device being shown inelevation and the “cover re
annular vgroove 28. in the circumferential surface
braking system, through a‘ passage 25 extending
moved‘; Fig. 2‘ is an end elevational view partly in ‘ of the piston stem 1, radial passages 29 in said
30 section of the operating mechanism of the device stem, and thence through an axial passage 26 in 30
they piston body itself.
with the base plate and cover shown in section;
In operation, so long as the ?uid pressure ob
and Fig. 3 is a sectional View similar to a portion
of Fig. l but showing certain parts in a different taining in the main reservoir 21 and in the cham
position.
ber 24 of the movable cylinder 8 exceeds a pre
35
As shown in the drawings, the indicating device determined safe value, the movable cylinder is
comprises a base plate I having a lug or web 2 to held against the action of the helical spring 9 in
which a piston body 3, provided with suitable its right hand position relatively to the ?xed pis
packing 4, is rigidly secured by means of a nut 5 ton 3, and the signal arm I8 is consequently held
cooperating with the screw-threaded end 6 of the in a horizontal position within the casing (formed
40 stem 1 of the piston body.
‘
by the base plate I and cover 2|) parallel to the 40
The piston body 3 is elongated and constitutes axis of and alongside the cylinder 8, as shown
a guide for a movable cylinder 8 in which the pis
in Fig. 1 of the drawing. Under these conditions
a packing 30, provided in the ?anged screw
ton body is located, a helical spring 9 being ar
ranged, so as to surround the external cylindrical threaded member II, is urged against a shoulder
wall of the cylinder 8, between the ?ange I0 of a of the piston body 3 and possible leakage of ?uid 45
?anged screw-threaded member I l secured to the from the chamber 24 of the cylinder 8 past the
end of the cylinder from which the piston stem 1 packed and elongated piston body, which is pro
projects, and a lug or web I2 of the base plate I, vided with grooves 32 to minimize leakage, is
this lug or web being apertured at l3 so as to per
positively prevented.
mit the movement of the cylinder therethrough.
The cylinder head 8a at the other end of the
cylinder 8 is provided with a lug I4 through an
In case the ?uid pressure obtaining in the main 50
reservoir 2'! falls below the predetermined safe
aperture in which one leg .of a substantially U
shaped link 15 extends, the other leg of this link
being arranged to extend through an aperture in
‘
>
value, the cylinder 8 is moved towards the left
hand relatively to piston 3 by the helical spring
9, until the ?anged screw-threaded member II
abuts against the lug 2 carrying the piston body 3, 55
2
2,137,495
whilst the sleeve I1 is rotated through the inter
mediary of the link IS in a clockwise direction,
thus moving the signal arm I8 through the elon
gated aperture 3| between the base plate I and
‘ the cover 2| from its horizontal position within
the casing to an upwardly extending, substantially
vertical position outside the casing, as shown in
Fig. 3 of the drawing.
In practice, the signal arm l8 may be arranged
10 to assume its horizontal position whenever the
pressure of ?uid in main reservoir 21 has a value
of for instance 55 pounds per square inch or more,
and. to assume its‘ vertical position whenever the
said pressure has a value of'for instance 45
15 pounds per square inch or-less;
having an aperture therein, a cylinder slidably
mounted on said piston and extending through
the aperture in the other lug and forming with
said piston a chamber in constant communica
tion with said reservoir whereby the pressure of
?uid in said reservoir tends to move said cylin
der on said piston, means at the non-pressure
end of said cylinder forming a spring seat, a
spring surrounding said cylinder and disposed
between said spring seat and the apertured lug 10
and acting on said cylinder in opposition to the
pressure of ?uid in said chamber, said cylinder
being movable against said spring relative to said
piston when the pressure of ?uid in saidreservoir
exceeds that of said spring and being movable in 15
While one illustrative embodiment of the inven
the opposite direction by said spring when the
tion has been described in detail, .it is not my in
pressure thereof exceeds that of the ?uid in said
tention to limit its scope to that embodiment or _ reservoir, and means operative by said cylinder
otherwise than by the terms of the appended to indicate the pressure condition of the ?uid
20 claims.
1
1
under pressure in said reservoir.
20
Having now described my invention, what I
3. A device for indicating the pressure con
claim as new and desire .to secure by Letters dition of the ?uid under pressure in a reservoir,
Patent, is:
comprising a casing having two spaced lugs, a
, 1. A device for indicating the pressure condi
piston carried by one of said lugs, the other lug
25 tion of the ?uid under pressure in a reservoir having an aperture therein, a cylinder slidably 25
comprising a casing, apiston in said casing, a mounted on said piston and extending through
cylinder slidabiy mounted on said piston and the aperture in the other lug and forming with
forming therewith a chamber in constant com
said piston a chamber in constant communica
munication with said reservoir whereby the pres
tion with said reservoir whereby the pressure
sure of ?uid in said reservoir acts to urge said of ?uid in said reservoir tends to move said cyl 30
cylinder relative to said piston, a lug projecting inder on said piston, means at the non-pressure
from said casing and having an aperture through end of said cylinder forming a spring seat, a
which said cylinder is adapted to operate, means spring surrounding said cylinder and disposed
on said cylinder forming a spring seat, a spring between said spring seat and the apertured lug
35 surrounding said cylinder and interposed be
and acting on said cylinder in opposition to the
tween said lug and spring seat acting on said pressure of ?uid in said chamber, said cylinder
cylinder in opposition to the pressure of ?uid in
said chamber, said cylinder being movable rela
tively to said piston to one position when the
40 pressure of ?uid in said reservoir exceeds that
of said spring, and to another position when the
pressure of said spring exceeds that of the?uid
in said reservoir, and means operative by said
cylinder in its di?erent positions to indicate the
pressure condition of the ?uid in said reservoir.
being movable against said spring relative to
said piston when the pressure of ?uid in said
reservoir exceeds that of said spring and being
movable in the opposite direction by said spring
when the pressure thereof exceeds that of the
?uid in said reservoir, and means operative by
said cylinder to indicate the pressure condition
of the ?uid under pressure in said reservoir, said
piston and the lug carrying same having pas 45
2. A device for indicating the pressure condi
sagewaysforming, the communication between
tion of the ?uid under pressure in a reservoir, said reservoir and chamber.
comprising a casing having two spaced lugs, a
piston carried by one of said lugs, the other lug I
ARTHUR GREENWOOD KERSHAW.
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