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Nov. 26, 1946.
F. w. DwYER
Filed lJuly s,r 1945
___„wxs-n.1. im_ _
Patented Nov. 26, 1946
FrankvW. Dwyer, Chicago, Ill.
Application July 3, 1943, Serial N0.493,379
12Y claims». (c1. 73401)
This invention relatesxto pressure' gauges and
the like.
Oneof4 the objects Yof the invention isthe> pro
vision; ofça new andï'improved 'gauge for deter
mining pressuresv either. above’or below atmos-A
pheric, together with a novel container‘forr the
indicating fluid.
the board and at an acute» angle from the chan
nel I5, and in communication with saidl channel,
isa groove I6 for receiving the other arm of
the indicating tube, as will hereinafter appear.
The front end of the board or sup-port Il is
provided4 with a recess l1 extending vertically,
that is, transversely to the board; and mounted
Another-object ofîtheï invention is the provi
ín’this recess is a reservoir block l5, of suitable
sion cfa newand’imprcved" gauge having novel
means for leveling and; adjusting the' gauge’for 10 material, ïfor’containing' the indicating liquid. .
Preferably, though not necessarily, this reservoir
bringing' the meniscus ofthe liquid columnto- the
is ofplastic material and transparent, For the
zero point.U
purpose of this application it may be considered
‘ A yfurtherfcbject of thef invention is the pro
vision of a new andimproved gauge having-novel
as being made from a blocky oi “Lucite”l (ther
liquid traps :for preventing th‘eff escape ’of ’the liqe 15 moplastic methyl _methacrylate resin). As shown,
the block I8 isprovided with a bore I9 extending
uidA in the indicatingY column when. th'epressure
longitudinally of the block and' enlarged at‘its
or suction exceeds a predetermined amount; i; .
lower end. This enlarged portionv of the bore is_
A 'still'.further. object of the: inventionisf the Y adapted
to contain a liquid'zl, which maybe, and
provision fof a new `and.` improved'.gauge> that
is' simple in 'constructiomeñ‘icienti and accurate 20 preferably: is, a suitable‘light'o’il colored red or
some other suitable color,'as may be desired.
in use, that is easily assembled and. adjusted,
The bore I9» extends to the upper end of the block
and'r that is provided with simple and. efficient
I`¿8,~'an_d its intermediate lportion is _restricted in
means for preventing the escape ofïthe indicating
diameter to> form ashoulder 22 adjacent to the
liduid .in :event thefpressure or suction:exceeds`
upper end of the board.
the capacityîof’ïthe gauge; '
25 The block I8 is slidably mounted in the' groove
v.Other and further objects and advantagesrof .
I1, ,and/'is adapted. tube raised and lowered by
they invention willappeai-.fromf the following>
the mechanism shown in Fig. 4 that will now be
description, taken in connection with the: accom»-V
panying drawing, .in which”.
3 '
- Fig; l is a perspective View of the device;`
Fig'. 2 is a sidek elevation vofthe ìndicator'fluid
container, Vdetached » ‘from the; supporting board;y
Fig. 3 is an enlarged vertical‘sectional Aview of:
on'eïof the reservoirs; showing th'e'trap valve. in
position. therein;
. "Fig, 4y is >a perspective' viewfof the 'lowe'?l portion
with partsrbroken away."
described. ÁMounted on the lower end ofthe
30 block- |,_8 is a plate 23 which is rigidly secured to
»the block,`as by means of the'screw 24, The plate
23 extends laterally into a counter-recess 25
formed-in> the botto-moi the Vrecess l1, as shown'
moreA clearly in Fig. 4. Attachedr to the bottom
Y Vend of; the board ll; vas by means of _a screw 26,
35 is a plate 27, having’an opening in its forward
,end throughqwhicn a screw 28 extends.A Thek
Y screkwf28‘has .mounted thereon4 the nuts‘29 above
- ~ ~ -.
Referring now to the drawing, the `reference y
character. Hlïdesignates. the 'pressure gaugeí which
comprises a V'supporting- wall l-'Illî adapted4 tot be
vertically arranged and held` iiiuprightposit-ion>
by' means ofra bar'l2, 'which extends transversely
the plate' 2,1, andv the- latter is held between the
nuts 2_9' and a shoulder 3|` on the. lowerk en_drofr
the'screwzs, which holds, the screw from verti-,v
cal movement@ >The screw is adapted to engage
a rscrevv-threaclk-Íed opening vin theY plateY 23', so '
thatf'when the‘knurled'` head „32 of the screw is ~
of. what-:for convenience y of 1 description will fbe
rotated it' win cause the plate 23 and tht-¿block
45 I8 yto be raised and lowered -for positioning the
wall Il,` and-rigidlyîattachedîfthereto; ¿Theewallf
or' board ¿Hf may 'be reinforced'ï'at each end by 1 meniscus 'o_f theliquid column, as will ypresently
termed the .outerïendi ofA the Isupportingboardsor f
bars 13,44; which îextend vertically' across .thev
ends thereof andare -rigidly secured 'to‘tlie'iboar'dé
The .lower portion of the board 'I Iv is 'routed out
' appear.
The recess jl'l isßenlarged in width at its-upper
so* end, andis adapted’to receive, in addition tov the
or recessed to form a wide channel I5 extend-'f
ing lengthwise tothe boardfadjacent its 'ilofwer .
end, to »provide a Aclearance‘ioi' a portion offtlieî .
block‘i I8, V`»a short block 34 having a bore therein
for7 forming afcha'mber 35, 'as shown in dot-ted
lines »in Fig.y l, vThe block 35%, lwhich maybe
termeditlfle “terminal block,” restsïon the ledge
indicatingY tube',>` as will? presently'>
appear. Ex“ ' formed by theenlargement lofthe upper end À_of
tending»¢iia,¢,f'o1fiallyl upward from-the outer;endet’-I 552 the recess yI’Ll The: terminalßblock, 34; and'. block
I8 are held in position by a lo-op strap 35, extend
ing over the same, as shown in Fig. 1. This loop
his snugly enough to hold the terminal block 34
from movement and at the same time permit
vertical movement oí the block I3. The terminal
chamber 35 and the main reservoir I9 are con
ing 49, in assembling the parts, the lower end
of this opening may be‘ñared downwardly and
outwardly, as shown at 53.
A float 54, of suit
able material, is provided for raising the valve
to its closed position by the liquid entering the
chamber 35. As shown, the float 54 is of cork
or like material, and extending through the ver
nected together and are in communication with
tical axis thereof is a tubular member 55, into
each other through an indicator tube member
whichthe lower end of the valve stem 5I is adapt
3l, which is located in the channel I5 and groove
ed to extend for guiding the valve..
I5. The tubular member 31 comprises a substan 10
In order that the liquid that may expand into
tially horizontal portion 38 and an inclined por
the chamber 35 shall escape back into the tube
tion 39, which together form a V or an acute
39, the lower end of the float 54 has inserted
angle 43, with one side substantially horizontal.
therein a plurality of pins 54a which extend down
The inclined portion 39 is rigidly held in the
wardly and outwardly around the lower end of
groove I3, as by means of suitable clips 4I.
the float, and are adapted to engage the shoulder
The section 39 of the angular tube member 31
5B formed in the upper end of the block 34, shown
is fixed within the groove, while the section 38
more clearly in Fig. 3. When the retreat of the
may be iiexed, The tubular indicating member
liquid downward from the chamber 35 causes low
31 may also be of “Lucite,” or any other suitable
ering of the float 54 to relieve the thin rubber
transparent plastic. One end of this member is 20 disc or valve 52 of sealing pressure, the valve
in communication with the lower end of the reser
tends to drop out of its sealing position by grav
voir I9, and the upper end is in communication
ity and this tendency is desirably augmented by
with the lower end of the chamber 35 through
the weight of the pin forming the valve stem 5I,
suitable passages in the blocks I8 and 34, respec
the Weight of the pin being exerted against the
tively, A graduated pressure scale 50 is provided 25
rubber valve.
back oi“ the inclined arm 31 for indicating pres
Suitable means are provided for leveling the
sure. The graduations are made with the board
gauge preparatory to taking readings from the
in upright position, with the top edge substan
same. In the construction-shown, the bottom end
tially horizontal, and in order that the readings
part of the inner end of the board II is provided
shall be accurate it is necessary to level the board
with a laterally extending plate 56a, which is rig
before taking readings. A spirit level 33 is mount
idly attached to the board, as by means of the
ed on the board I I for leveling the same prepara
screws 51. The plate 55a is provided with a
tory to making tests.
screw-threaded opening adapted to be engaged
Suitable means are provided for preventing
a screw 58, having va thumb-piece 59 thereon,
loss ‘of the indicating fluid when the pressure 35 by
and a supporting leg 60 extending downwardly
exceeds the capacity of the gauge. The two blocks
therefrom whereby the screw may be turned for
34 and I8 are each provided at their upper ends
raising or lowering the front end of the board
with a trap valve, and since the two valves are
Il. The level 33 will indicate the correct posi
duplicates of each other only one need be -de
40 tion of the board when the same has been ad
justed by the thumb-piece 59.
As-shown in Fig. 3, the block 34 is internally
The board II may be provided with means
threaded at its upper end for receiving a closure
whereby the same may be permanently attached
or stopper 42a, formed of a Suitable material, such
as plastic or the like. This closure is provided
with an enlarged axial recess 43a for detachably
receiving the end of a tubular connector meme
ber 44, >the opposite end of which has attached to
it av rubber tube d5. Theopposite end of the rubber
tube has a tubular member attached thereto that
is not seriously affected by heat or chemicals in
the air, and that is adapted to be inserted in a
< chimney, or the like, for taking the »readings of
to the wall of a factory building, or the like. In
order to attach the gauge to a factory wall, or
the like, the board Il is provided with an open
ing 62 at one end for the reception of a screw,
and at its other end with a slot 63 whereby the
board may be adjusted to level position, as indi
cated by the bubble in the level 33. It is nec
essary, of course, to remove the support I2 before
attaching the board I I to the wall of the factory,
or the like. It may be necessary at times to re
Since this arrange
plenish the liquid in the reservoir I9, and in order
mentis so well known to the art it is not felt nec
essary to illustrate or describe the same more in 55 that this may be done without removing the plugs
either pressure orsuction.
A gasket 45V may be provided between the clo
sure or stopper 42a and a shoulder 41 on the in
terior of the bore 43 of the block 34. The open
ing 43a extends axially of the closure or stopper 60
42a, and is provided adjacent its lower end with
a restricted- portion 49 for receiving the valve or
stem 5I of a valve 52, which is adapted to close
the opening 49 and prevent the escape of the liq
uid when >the same ~fills the chamber 35. The
valve 52 is concave upwardly and is of suitable re
silient, comparatively thin, flexible material, such
as neoprene (chloroprene rubber), or any other
42 andY 42a the block I8 may be provided adja
cent its upper endI with a rthreaded opening ex
tending into the bore, and which‘may be closed
by a screw B4.
The blocks I8 and 34, together with the angu
ular tube connection 31, constitute what may
be termed the indicator unit. Any suitable means
may be employed for supportingr this unit. While
the arm 38 is shown vas being substantially hori
' zontal, this is not necessary since this arm merely
constitutes an addition to the capacity of the res
ervoir I9.v It is only necessary that the parts be
so mounted >that when in reading position the
level of the liquid in the reservoir I9 shall be in
suitable material not affected by the liquid. By
making the valve concave and> of comparatively 70 the plane of the meniscus of the tubular mem
ber 39.
thin and resilient material, it is readily distorted
When it is desired to determine the draft of a
to make a'seal even though the stem be not ex
chimney, for instance, the connector 44 is in
actly perpendicular. This is considered an im
serted in the bore 43a of the stopper 4?.a of the
portant feature of the invention.
`34,- the board II is adjusted to its level po-V
In order to guide'the valve stem into the o`pen-»V
sitionbymeans'- of the thumb nut tit-l,A andthe
meni's'ßcuvs lof4 theY liquid column in thev indicator
with saidïreservoir and chamber and being adapte
edto-containan indicating liquid, a valve in said
chamber for preventing the escape of'liquid there
arm-,Bilisladjusted vto Zero-by turning the thumb
pie'ce 32~to eitherl raise or lower the block I-8_, as
the' casema'y be,- toV the‘adjus'ted‘position: The
free end of the“"tu-bef45,'A `Whichis vprovided With>
aL rigid extension used in’such constructionais
thenjplace,d'in` the draft of? thej chimney, andthe '
draft’will exhaust air from-_ above >the liquidA in
lthe arm
` 39.'` The-pressureV ofv air on the liquid
2 If inthe reservoir' i9 will force the liquid> up the
inclined passagejâíßj until > an equilibrium is
?ea'chedg‘afterjwhich thefreading-is made Yon the
scaievsu'aiongßtne sfide-,0f the' armas;`
_ ¿
_' Ín' measuring" pressure' thei‘connector `dllI is' 'in
se‘rte'd in thelopening 43 in the stopper 42. f `While
use >with’the connector-fin` the opening ‘43% the
opening""43imust"not be'closed. When not in
use. the" passages 43> and 43a'are closed by _suit
able stoppers for preventing- the escapefof the
indicator liquid i9, should the> board be tilted or
laiddown iiat.
It is'thought from the foregoing, taken in con
nection with the accompanying drawing, that
the'construction and-operation of my device will
.be apparent to those skilled in the art, and that
changes in size, shape, proportion and detail may
`be made without departing from the spirit andy
scope of the appended claims.
Iclaim as my invention:
1..In a pressure gauge, an upstanding sup
porting member, a reservoirY vertically adjust
able thereon, a co-nduit in communication» with
said reservoir and in the form ofY an angle with
one side extending diagonally upwardly and lat
erally, and rigidly secured to said member, said
conduit being of Aflexible material and transpar
said groove; ‘said conduit being in> communication
from, a >vscale along said inclined arm, a connec
tor means for conducting `pressure to'said reser
voir, a port above said reservoir in said ñrst
named-block throughv which an indicatingV liquid
` may be'introduced to said reservoir, and -a clo
10 'sureforsaid-port».
-4'1’7In a pressureïgauge, a block having a cham
ber therein,- a stopper for closing the upper end
of said chamber, an axial opening extending
through said Stopper and vadapted tolreceive a
connector member, a valve comprising a thin
concave flexible ymember of'elastic material, a
iioat» for' elevating said member over said open-ing for closing’thesame when the indicating fluid
rises above a» predetermined heightw'itlun said
chamber, and a guide stem for said float'.>
`5. 'Inï'a pressure gauge, a reservoir, a Support
for lthe same, an indicating tube having a, ilexi
blgportion' in the form rof an acute angle having
one arm iii'mlyconnected to Asaid reservoir and
extending outwardly, therefrom and the other
arm connected to the outer end of the first
named arm and extending upwardly and later
ally therefrom, means for rigidly securing theY
inclined arm to said support, means for raising
y andlowering said reservoir and ñexing said tube,
andV a scale extending along said inclined arm.
6. In a draft gauge, a reservoir- for containing
1 an indicating liquid, a support therefor, a pas
sage of flexible material connected to the lower
portion of said reservoir and extending laterally
therefrom and then diagonally upwardly above
said reservoir, means for elevating said reservoir
independently of said support, the inclined por
contain a liquid, a scale associated with said con
tion of said passage lbeing ñxed to said support
duit graduated to indicate the pressure> on said 40 whereby when said reservoir is elevated said pas
reservoir, and means iorrvertically,adjusting said
sage is iiexed, and means for l eveling said support.
reservoir by iiexing said conduit for adjusting
' i ent, said reservoir and conduit being adapted to
the meniscus of the liquid in said conduit to zero
on said scale.
2. In a draft gauge, a block ci plastic Ina
terial having a bore leading to a chamber therein,
said chamber having an abutment in the lower
'7.V InI a pressure gauge, a block having a bore f
leading to a chamber therein, a Stopper for clos- -
Ul ing the upper end of said chamber, an axial open
ing extending throughsaid stopper and adapted
' lto receive a connector member, said chamber
portion thereof and an upwardly> extending open
comprising a trap including a valve member, a
ing, a stopper for said'opening having a passage
float for elevating said valve member for clos
therethrough, a valve forfclosing said passage 50Y ing said opening when the ñuid in said chamber
from the inside, said valve comprising a valve,
rises above a predetermined amount, and a plu
stem insertable in said passage for guiding said
rality of spaced apart pins extending downward
stern, a concave resilient iiexible valvek for seat
ly from said float for supporting said float above
ing over'said passage ñxed on said stem, a lloat
the >bottom of said chamber when there is not
having a passage therethrough for receiving the 55Èumcient liquid in said chamber to support said
lower end of said stem, and pins extending down
from said float for engaging said abutment forl
preventing said stopper from closing said borey
- when said» chamber is in upright position.
3. A pressure gauge comprising an upright base
. board having a channel across-its lower edge por- `
tion and having a groove extending upwardly and
forwardly from the outer end of said channel,
a vertical recess across> the inner edge of said
board and extended laterally at its upper end,`
a block vertically adjustable in said recess and
Ahaving a reservoir therein in communication» with
the atmosphere at its upper end, a second block
having a chamber therein in the lateral exten
sionYV of said'recess, said chamber beingvin com
munication with the atmosphere at its uppermost
partv thereof, a conduit capable of' being iiexed
having atransparent portion in the‘form of an
acute angle having one arm'extending along said
8. In a pressure gauge, a chamber having an
opening to the atmosphere, a support, a reservoir
' on said support for containing an indicating liq
uid, a tube flexibly interconnecting said cham
ber and reservoir, means for raising and lower-- ~
ing said reservoir on said sup port, said chamber
being above the bottom of said
said tube .v
having a transparent portion, reservoir,
a scale associated
with said >transparent portion for indicating the
liquid level therein, a closure for‘said opening
witliin‘said chamber, and a ñoat for elevating
said closure for closing said opening when the
indicating iiuid risesV above a. predetermined
height Within said chamber.
9. >An indicator ¿unit for a pressure gauge com
prising a reservoir, a chamber, a liquid-contain
ing tube of transparent material arranged in the
form of an angle' with one arm extending up
channel and movable therein> and the other valong 75 wardly and laterally to said chamber and the ,
other arm connected with said reservoir, said
other arm being flexible to permit relative vertical
movement between said chamber and said res
ervoir, and adjustment means for causing rela
tive vertical movement between said chamber
and said reservoir to vary the liquid level in said
first-mentioned arm of the tube.
sure in said chamber for said opening comprising
a flexible resilient concave disc, and a float mem
ber for elevating said disc When the liquid rises
within said chamber to a predetermined level,
said disc and _float member being structurally sep
arate for independent movement and separate
replacement when necessary.
l2. In a pressure gauge, an upwardly extend
l0. An indicator unit for a pressure gauge com
prising a reservoir, a chamber, a liquid-contain
ing passagecontainìng a column of non-metallic
liquid movable therein in response to pressure
ing passage means interconnecting said reservoir
changes, a normally open vent port at the upper
and said chamber, said passage means being in
the form of an angle with a fixed upwardly and
end of said passage, a ñoat body in said passage
movable towards said vent port in response to ap
laterally extending transparent arm connected to
proach of the liquid column to the port, means
said chamber and with a ñexible arm connected
including a perforated resilient member for es
to said reservoir, means for raising and lowering
tablishing a seal to out oñî said vent port in re
said reservoir with consequent ilexure of said
sponse to rise of said float body, said means in
passage means, and means within said chamber
cluding also a weighted member for sealing off
for preventing loss oi liquid therefrom.
11. In a pressure gauge, a reservoir, a ñuid
containing indicator tube having one end con
nected to said reservoir, a chamber connected to
the other end of said tube for receiving overflow
liquid therefrom, said chamber having an open
ing of reduced diameter in its upper wall, a clo
the perforation in the resilient member and be
ing adapted by> its weight to open said seal when
said float body moves downward away from the
vent port.
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