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Патент USA US2404361

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July 23, 1946.-
N. BREWER I
2,404,361
ROTAMETER
Filed April 27, 1943
= 67
300:
5 Sheets-Sheet l
July 23, 1946.
'
N. BREWER
2,404,351
ROTAMETER
Filed April 27, 1943
‘
~
'
s Sheets-Sheet 2'
'
_ July 23, 1946.
N. BREWER
2,404,361
ROTAMETER
Filed April 27, 1945
‘I
1
a Sheets-Sheet s _
v
Patented July 23, ‘1946
2,404,361
UNITED STATES PATENT ‘OFFICE
Nathaniel Brewer, Hat?eld, Pa., assignor to
‘ Fischer & Porter Company, Hatboro, Pa., a cor
poration of Pennsylvania
‘
Application April 27, 1943, Serial No. 484,710
1
11 Claims.
(01. 73-209)
2
The present invention relates to ?ow-meters
and it relates more particularly to ?ow-meters
?cation, appended claims and accompanying
of the type commonly referred to as rotameters
For, the purpose of illustrating the invention,
drawings.
'
in which a generally vertical metering chamber
there are shown in the accompanying drawings
having vertically varying cross-sectional area is
forms thereof which are at. present preferred,
provided with a Vertically movable “?oat” or
since
the same have been found in practice to
sinker; the position of the ?oat within the cham
give
satisfactory
and reliable results, although it
ber determining the size of the ori?ce available
is to be understood that the various instrumen- .
for vertical flow of ?uid through the chamber
talities of which the invention consists can be
and being a measureof the rate-of-?ow.
10 variously arranged and organized and that the
An’ object of the ‘present invention is to provide
invention is not limited to the precise arrange
a simple, inexpensive and durable rotameter
ments and organizations of the instrumentalities
which can be installed in conventional pipe lines
as herein shown and described.
or the like, Another object of the present inven
In the accompanying drawings in ‘which like
tion is to provide a rotameter, the frame of which 15 reference characters indicate like parts through
is made up of two identical and interchangeable
out:
—
parts. Still another object of the present inven
tion is to provide a rotameter in which the
‘,‘heads” for connection to the ends of the meter
ing chamber are adapted to be held in spaced
relationship to each other without the use of
spacing bolts or columns. A further object of
the present invention is to provide a rotameter,
Figure 1 represents a perspective View of one
embodiment of‘the present invention as it ap
pears when disassembled.
Figure 2 represents a vertical cross-sectional
view of the embodiment shown in Figure 1 in as
sembled position.
‘
-
Figure 3 represents an end elevational view of
the frame or housingnof which consists of two
identical and interchangeable castings which can 25 the embodiment of Figure 2.
Figure 4 represents a plan view of the embodi
quickly and easily be assembled and dis-assembled
ment of Figure 2.
by means of simple bolts or the like. Another
Figure 5 represents a view partly in vertical
object of the present invention is to provide a
cross-section and partly in perspective of the
rotameter in which thelmetering tube is held
between the “heads” of the frame solely by end 30 metering tube shown inFigur-es 1 and 2.
Figure 6 represents a horizontal cross-sectional
wise compression and in which ?uid-tight seals
view generally along the line 6-6 of Figure 2. _
are provided between the ends of the metering
Figure 7 represents a horizontal cross-sectional
tube and the heads solely by end-wise gasketing.
view generally along the line l—‘! of Figure 2. ’
A further object of the present-invention is to
provide a rotameter in which the sealing pressure 85 Figure 8‘represents a horizontal cross-sectional
view generally along the line 8—8 of Figure 2.
required for maintaining ?uid-tight seals between
Figure 9 represents a view. similar to that of
the ends of the metering tube and the “heads” is
Figure
5 but showing a modi?ed form of metering
supplied by the fastening meansemployed to con
tube in which the angle-cut ?utes are given a
nect the parts of the rotameter frame to each
other. Another object of the present invention 40 downwardly-diminishing radial depth and in
which the outside of the tube is made conical.
is to provide a rotameter having inlet and outlet
Figure 10. represents a horizontal cross
openings in the upright portions-of the frame. A
sectional view along the line l0—l 0 of Figurev9.
further object of the present invention is to pro
'Figure 1.1 represents a horizontal cross
vide a rotameter in which the frame is provided
45 sectional view generally along the line ll-—l| of
with conduits leading from the upper and lower
Figure 9. v
'
“head” portions thereof through the upright por-.
Figure
12'
represents
a
horizontal
cross
tions and terminating in generally horizontally
sectional view generally along the line |2—|2 of
extending inlet and outlet openings disposed gen
erally intermediate the ends of the vertical meter
Figure 13 represents a view similar to that [of
ing tube. Still another object of ‘the present in
Figure 5 but showing a further modi?ed forni‘oi"
vention is to provide a rotameter which can be ’
?uted meteringv tube in which the ‘ v?utes are
installed directly into a horizontal pipe line.
rounded instead of being angler-cut as in the em
Other objects and advantages of the present ln-_
bodiments of Figures 5 and 9.
. 1
vention are 1 apparent in the following speci
Figure 14 represents a horizontal cross-g
Figure
9.
‘
.
'
'
2,404,361
3
A similar pair of bolts can be inserted through
the openings 45‘of the upper inverted housing
element 39—b and can be fastened within the
screw-threaded sockets 43 of the lower element
39——a. When the two pairs of bolts 46 are tight
ened,’ the end wall 42 of each of the housing ele
‘ sectional view generally along the line 54-44 of
I Figure .13.
‘
Figure 15 represents a horizontal cross-sectional
‘ view generally along the line |5—-|5 of Figure 13.
Figure 16 represents a cross-sectional view simi
lar to that of Figure 14 but showing a tube hav
in cross-section.
'
‘
‘
face “of the other or the'housing elements 30
to provide the assembled generally rectangular
'
Figure 17 represents a view similar to ‘that of
Figure 5 but showing an un?uted metering tubal}?
‘ having a conical or tapered inner bore.
‘
I
ments 69 is held firmly against the seating sur
1 ing tapered ?utes which are generally elliptical
1
_
4
Figure 18 represents a cross-sectional view gene . '
rotameter frame or housing. 7
‘A relatively short thick-walled rotameter tube
’ is'adapted to be held in an upright position be~
of
tween the housing elements 39. One form
'
. erally along the line
metering tube which'may be used with the rotam;
Figure 19 represents a horizontal‘cross-sectional' " 'eter of my present invention, is the tube 3|,
1 Viewgenerally along the line | 9-149 of Figure 17." shown in Figures 1, 2 and 5 which is thesubject
Figure 20 representsa perspective view of a
of my‘copending application '7 Serial No. 484,711,
‘ stop pin alternative to that ‘shown in Figures 1
?led April 27, 1943, Patent No. 2,377,861, granted
‘
and2.
’
v
Figure 2d represents'a perspective view of an- 4
other modi?ed form of stop pin.
‘
In the embodiment shown'in Figures 1 1308,
I may provide a rotameter having a frame or
housing formed of ‘two symmetrical interchange
able elements which are designated generally by
the'Treference character 36. The housing elements
39 are generally L'-shaped as shown particularly
in Figure 1 and are adapted‘to be. 'detachably
connected to each other to form the generally
rectangular rotameter'fra'me or housing._ ‘When
the elements 3B are so connected, the'lower vone ~
constitutes the inlet housing element which is‘
designated more particularly as 39—-a while the
upper one constitutes the outlet housing element
which is designated more particularly as til-‘b.
The housing elements 39 are adapted to‘ sup
port,»and to provide communicating conduits to,
the ends of ‘a'transpa'rent vertically disposed me
tering tube 3| having a metering ?oat 32 ‘adapted
for free up-and-down movement therein." ‘
'7
' '
Each. of the housing elementstil is ‘provided
with a centrally-disposed opening t3‘extending
June 12, 1945.
7
‘
vThe metering tube 3| which is adapted to be
held in upright position between the housing ele
ments 39 is a relatively short, thick-walled trans
» parent tube which is usually of glass (but which
maybe of transparentsynthetic plastic or other
suitable material).
'
‘
The metering tube 3| has a cylindrical outer
surface 41 and is provided with a generally cy
lindrical inner bore 48 within which the cy
lindrical metering ?oat 32 (or any other conven
tional type of metering ?oat) ?ts with a relatively
close annular clearance as shown,‘ for example,
in Figure'Z.
'
’
A plurality (as
'
'
for example 4) of flutes 49‘
are circumferentially disposed around the ‘inner
' bore v4S and extend generally axially of the tube
3|‘. Each of the?utes 49 'isformed byradially
extending plane side walls 59 and a circumfer
entially extending curved back wall '5 l. The back
walls 5| ‘are formed as’ segments of a cylindrical '
surface whose‘ center of curvature lies at the
axisv of the tube so that the ?utes 49 have the"
same radial depth throughout theiraxial length.
from the inner face 34 of the bases-550i the L
and forming a “head”v portionfof the .rotamet‘er
frame or housing. A screw-threaded opening 39
The‘side'walls 5i] converge downwardly so that
the‘ ?utes “49 have a ‘relatively large circumfer
ential dimensionat the top of the tube- 3|; (at
which point the cylindrical inner bore 48 of the
extends in alignment with, and in continuation
of, the opening 33 to the outer face 310i the'base
tube ‘3| is reduced to four small portions inter- ‘
mediate the ?utes as shown in Figure 6‘) and so
35.‘ The opening 36 is adapted removably to re
ceive a screw-threadedplug 38.
'f
"
that the ?utes terminate at the point of inter
A conduit 39 extends within the housing’ ele-‘ 50 section of the sidewalls 59, somewhat abovethe
ment' '30 from the central opening 33 thereof
lower end of the meterin‘g'tube 3 I. Slightly above
through the upright portion or'arm 49' of the-L
the "lower ends of the ?utes 49, the inside of thev
and vterminates in an outwardly-extending screw
tube 3| would have vthe appearance shown in
threaded opening, 4| in the upright portion 49.
Figure '7 in which-the,‘ cylindrical bore 48 occu
The‘end wall 42 of ‘the arm 40is'provided with 55 pies'most of‘th'eperiphery with the ?utes 49 oo
a pair ‘of ‘inwardly-éextending ‘screw-threaded
cupying only‘ very small portions of the periph
ery.'~The lowermost portion 52" of the tube 3|
V sockets 43 whose function willbehereinaf-terdef
scribed;
-
a
-
>
1.
.
> The‘ end of the base 35 is provided with ‘a smooth
slightly raised inwardly-extending seatingsurface
44; a pair of drilledopenings 45 extending through
the base 35 from the ‘outer face 31 thereof to the
a
60
(below the lower ends of the ?utes 49) has ‘a
wholly cylindrical inner ‘bore as shown in Fig
ure
8.
a The
-
Y
tube’ 3| : is
'
'
'4
adapted to be positioned
intermediate the lower housing element ‘39-11
and the inverted upper housing element 39-—b'
The openings '45 and the sockets 43 are sym
with the inner bore ofthe' tube communicating
metrically disposed on either side of-the central 65 with’ the .central'0penings-33 in the. housing ele- '
transverse plane of the housing member'sothat
ments.~
»
,
a pair of headed screw-threaded bolts 4ttcan be
L'A' generally circular gasket-seat 53 is formed
inserted through the openings '45~of thevhous
upon-the inner face 34 of, the base 35 of the
ing element 39-41, as indicated in Figure .1, and
housing element surrounding the , opening 33»
fastened within ‘the sockets-43- of the inverted 70 therein. vA pair ofisimilar aperturedv compres- ~
elem'ent-Sil-b; the outer-ends-of the openings
siblef sealing 'gasketsjii, are disposed upon the
45 being preferably enlarged to permit the. bolts
gasket-seats 53 and ‘are’ adaptedvto provide-a
46 to be counter-sunk and ‘to be. generally ?ush
?uid-tight seal intermediate the ends of the me
with the outer face 31 oitheabase 351when‘fully
75 tering tube3| and vthe housing elements 39-11
seating surface'44yr 1
screwed in.
>
-
‘
-
'
2,404,361
5
6
and 30——b when end-wise pressure is exerted,
upon the housing elements.
7
The dimensions of the several parts of ,the ro
tameter of the present invention are so propore
tioned that, when the bolts 46 draw the end walls
42 and the Seating surfaces 44 into contact with
each other, end-wise pressure is exerted upon the
gaskets 54 which is sufficient to provide a ?uid
tight seal between the ends, of the tube 3| and
the housing elements but which is not great 10
enough to cause breaking or straining oi the rela
tively frangible metering tube.
I
. r
The housing elements 30 are provided with re
than the pressure above‘ the ?oat) whereupon the
?oat is moved upward within the tube. But as
the ?oat is moved upward, a greater by-pass'
area is available to the ?uid (due to the fact that.
the ?utes become greater in cross-sectional areav
near the top of the tube) and the pressure un
balance is reduced so that the pressure-drop
across the ?oat again becomes relatively constant
and the ?oat remains relatively still at a higher
position within the tube.
,
'
.
In this way, the height of the ?oat within the
tube is a direct indication of the rate-of-?ow of
the ?uid. The rotameter can be calibrated forv
movable stop pins 55 which extend through gen
erally horizontal apertures 56 acrossthe central 15 ' the particular ?uid being metered so that the
height of the ?oat against the calibrations etched‘
openings 33 of the housing elementsyremovable
or otherwise applied to the outside of the tube 3|
screw-threaded plugs 51 permitting side-Wise in
Will be a direct reading of the rate-of-?ow of, the
sertion and removal of the pins. When the ro
?uid. Or, instead, the calibrations applied to the
tameter is assembled, the pins 55 extend horizon
outside
of the tube can be an arbitrary scale, the
tally just above and below the ends of the meter_
ingtube 3| and serve to limit the up-and-down 20 reading of which will givetherate-of-?ow of any
one of several ?uids by reference to suitable cali
movement-of the metering ?oat 32. In this way,
bration and conversion tables. '
the metering ?oat 32 is kept within the con?nes
Due
to
the
fact
that
the
?utes
49,,do
not.
ex
of the metering tube 3| and is prevented from
tend to the bottom of the tube 3| so‘that the
rising or falling into the apertures 33 of the hous
25 ?oat, at rest, is in the cylindrical lowermost
ing elements 30.
portion 52 of the tube 3|, in which it has very
In place of the separate pin 55 and plug 51, I
slight clearance, even the slightest ?ow of ?uid
will be su?icient to raise the ?oat 32 appreciably
within the tube 3|, so that the rotameter of the
tegral.
Another form of stop pin is shown in Figure 21 30, present invention is sensitive to very small ?ow_
rates. On the other hand, the rotameter of the
in which a screw-threaded plug 53 adapted to be
present invention has an unusually wide. range:
inserted within the opening 36 is provided with
due to the fact that the by-pass areapresented by
an inwardly extending stop pin portion 60 which
may employ a stop pin 58, shown in Figure 20, in
which the pin and threaded head are made in
limits the movement of the ?oat.
.
the ?utes increases relatively rapidly asthe ?oat
35
moves upward within the tube so that even at
The rotameter of the present invention is
relatively large ?ow-rates the ?oat does not rise
adapted to be quickly and easily connected with
beyond the upper end of the metering tube 3|
in either horizontal or vertical pipe lines.
Where it is desired to measure the rate-ofe?ow
Thus, for example, where it isrdesired to meas
ure the'rate-of-?ow of a ?uid moving in, a hori 40 of a'?uid moving in a horizontal pipe-line from
right to left in Figure 2, the rotameter is simply
zontal pipe-line from left to right in Figure 2,
rotated around the imaginary axis of the meter_,
the plugs 38 are inserted within thev vertically
ing tube horizontally so that the side inlet open
extending screw-threaded openings 36 of the
ing 4| of the lower metering element 30-a ex
housing elements 3||~—a and 30—b and the pipe
tends toward the rightto receive the oncoming
line is connected to the screw-threaded side open
' ?uid from the pipe-line and so that the side out-,,
ings 4| of the housing elements 30; the side open
ing of the lower element 3|l-a forming the inlet
let opening 4| of the inverted housing element
30—b extends toward the left of the rotameter;
and the side opening of the upper inverted ele
the functioning of the rotameter being the same
ment 30-h forming the outlet of the rotameter.
The ?uid entering from the pipe-line at the inlet 50 as described hereinabove.
Whereit is desired to measure the rate-of;
opening of the element 30-.0. passes through the
?ow of a ?uid moving upwardly within a vertical
conduit 39 and the central opening 33 of the
pipe-line, the plugs 38 are removed from the
housing element 30—a and passes upwardly into
vertically-extending screw-threaded openings 36,
the cylindrical inner bore 48 of the metering tube
3| The upward pressure of. the moving ?uid 55 and are inserted within the side openings 4| of
the housing elements :30; the pipe-line being _con-_
lifts the metering ?oat 32 upward within the tube '
nected into the openings 36 aslshown; in dotted.
beyond the lower ends of the ?utes 49 whereupon
lines in Figure 2. Whenthe rotameter is so cone
the ?uid enters the ?utes, by-passing the ?oat,
nected, the upwardly moving ?uid will pass
and passes upwardly through the tube 3| beyond
the ?oat 32 into the central opening 33 and the 60 through the opening 33 of the lower housing
element 3||—a and into ‘the metering tube 3| ,
conduit 39 of the upper inverted housing element
to by-pass the ?oat 32 through the ?utes 49,
30—-b ?nally to leave the rotameter through the
?nally to leavethe opening 33 of ‘the upper hous
side outlet opening of the element 30-!) and to
continue its ?ow in the pipe-line.
‘ ,
ing element 30-?) th ough the opening 36
thereof.
'
j
I
'
The height of the ?oat 32 within‘ the metering 65
Therotameter of the present invention can also
tube 3| is a measure of therate-of-?ow of the
be "so installed as to change the direction of ?ow
?uid, the greater-the rate-ofe?ow, the greater
of ?uid in a pipe line. Thus,
’ for example, it is"
the height of the ?oat within the tube. That is,
possible to change from horizontal to vertical ?ow‘
when the ?oat is standing still at some point in
by connecting the, horizontal pipe-line to the
termediate the ends of the tube, the pressure drop
, side inlet opening 4| 'of the housing element 3||—a
across the ?oat of the rotameter is constant and
and by connecting the vertical pipe-line to the
is equal to the negative buoyancy of the ?oat in
outlet opening 36 of the housing element 30—b;
the ?uid. Upon any increase in the rate-of
the opening 36in the housing element 30-—a'
?ow, a momentary unbalance of pressure occurs
and the opening 4| in the housing element
(the pressure beneath the ?oat becoming greater 75 30-h
being closed by the plugs 38. Similarly,
2,404,361
shown in Figures 9 to 12 and 13 to 15 of the
it is possible to change from vertical to horizontal
flow by connecting the vertical pipe-line to the
Thus, for example, I may employ the fluted
‘inlet opening 36 in the housing element -30—a
tube
6! shown in Figures 9 to 12. The tube 6|
land by connecting the horizontal pipe-line to the
has a cylindrical inner ‘bore 62 generally similar
‘outlet opening 4! in the housing element 30—b; Cu to the‘ inner bore 48 of the tube 3!. However,
‘ the opening M in the housing element 30--a
drawings.
'
The housing elements30 can be readily and
‘ inexpensively formed as single castings in which 10'
the necessary openings and conduits can be
formed .by drilling or other conventional opera
l
‘
circumferentially disposed about the cylindrical
inner bore 62 of said tube 6| and extend gen
Since the housing elements are identical and
66 which is formed as a segment of a conical
fully interchangeable, it is necessary to manu 15 wall
surface having its axis of curvature at the axis
facture and to stock only a single type of hous
of the tube and being downwardly tapered at an
ing element, which with the metering tube, gas
angle more or less approximately parallel to the
kets and necessary bolts and plugs can easily be
angle of taper of the outer vconical surface 63.’
assembled and installed by any pipe-?tter or
Thus, the ?utes 64 vary not only in circum
20
mechanic of average ability.
ferential dimension (as is the case with the ?utes
Rotameters, as heretofore used, have been rel
49 ofthe tube 3|) but also in radial depth; the
atively expensive and “made to order” in that
?utes being large in circumferential and radial
each rotameter has been ordered according to the
dimension near their tops as shown in Figure 10
particular requirements of the proposed instaL
and being small in both radial and circumferen
lation. Rotameters, being precision instruments, 25 tial dimension near their bottoms as shown in_
have heretofore been installed only by specially
Figure 11. The ?utes 64 terminate somewhat
, trained and skilled men and such installation has
above the lower end of the tube 6! so that an
required specialized and relatively expensive ?t
tings, etc.
unfluted cylindrical inner surface 61 is presented
Thus, for example, a rotameter, as
at the lowermost portion of the tube 6| _
heretofore used, may consist of the metering tube,
3 separate inlet and out1et.“heads”~or ?ttings, a
plurality of supporting and spacing bolts or col
stu?ing
boxes for enclosing
1 umns for the heads,
7
Still another form of metering tube is the tube
68 shown in Figures 13 to 16,. The tube 68 has
a cylindrical inner bore 69 and a cylindrical outer
surface 16. A plurality (as for example 4) of
?utes ‘H are circumferentially disposed about the
the ends of the tube including packing and stu?- .
ing glands, bolts, etc.
Where the ?uid to be 35 inner bore 69 and extend generally axially. of
metered was passing through a horizontal pipe
the tube 68. VEach of the ?utes 1! (instead of
line, rotameters as heretofore known required
being angle-cut as are ‘the ?utes of the meter
ing tubes 31 and 61) is smoothly curved and is
special piping arrangements since their inlet and
outlet openings were at different levels.’
As the result of these and other factors, ro
tameters, as heretofore known, have been sold
formed. as a segment of a concavely conical sur
face having a downward taper. In this embodi
ment, the ?utes ‘ll extend the entire axial dimen
sion of the metering tube 68; the ?utes being
only at prices which are too high to permit their
use in many places where the inexpensive de
large and deep near the top of the tube as shown
in Figure 14 and being smalland shallow near
the bottom of the tube as shown in Figure 15.
termination of the ?ow-rate of a fluid is desir';
able.
7
'
‘I
g
'
_
The rotameter of ‘my present invention, on the
The rounded tapered ?utes, instead of having
the circularcross-section shown in Figures l3,
'
1 other hand, employing
as it does a single type of ‘
interchangeable housing element and eliminating
the expensive stu?ing-box, and greatly reducing
l4‘ and 15, may be given any other smoothly
curved cross-sectional ‘con?guration, as for ex
the number of parts, as'well as simplifying the
installation thereof,’ can be sold and installed at
a fraction of the cost of conventional rotameters.l
ample the elliptical cross-section shown in Fig
lire 16.
' l8 and 19 which has a conical, downwardly ta
pered inner bore 13 and a cylindrical outer sur
ablein a large and varied ?eld of industrial and}
termination of ?uid ?ow-rate.
'
inexpensive de
face 14.
V V
> While so-called “one-piece” rotameters, are
known, the expression “one-piece’? is misdescrip
tive of these oconventional rotameters, since the
'
The metering tubes 3 I, 6 I, 66 and 1'2 have been
described hereinabove only by Way of example
60 and it is to be understood that the novel rotam
latter, in reality, are composed vof an integralv
‘metal frame (having upper'and lower heads and,
connecting columns), upper and lower separate
metallic stu?ing glands, upper and lower sepa
rate metallic gland followers and three or four
packing rings in each stu?ng box; that‘is, ?ve
metal parts (leaving aside connecting bolts and
nuts andgthe like) and six or eight sealing ele
ments.~ The rotameter'of the present invention,
on the other hand, has only two metal parts and‘
two sealinglelements (the gaskets‘ at the ends
of the metering tube). ' ‘
'
ploy the metering tube 12 shown in Figures 17,
indicator are thus, for the ?rst time, made avail
‘ . home‘use inconnection with the
'
Instead of a ?uted metering tube, 1 may em
The advantages of the rotameters as a ?ow-rate
~
'
erally axially of said tube. Each of the ?utes 64
is formed by a pair of plane radially-extending
downwardly converging side walls 65 and a back
1 tions.
.
1
'
the outer surface 63 of the tube 6| is made conical
with a relatively slight downward taper.
A plurality (as for example 4) of ?utes 64 are
, and the opening 36 in the housing element 36---b
‘ being closed by the plugs 38.
'
i 1
7 Figures
In place
1, 2 ofandthe
5, Imetering
may employ
tube-other
31 shown
types of.‘
?uted metering tubes such as, for example, those‘ -
eter of my present invention may employ any
metering tube which presents substantial end
walls so as to permit end-wise gasketing between
the tubev and the housing elements.
7
The metering tubes employed with‘ the rotam
eter of the present invention may be calibrat
ed (by etching or otherwise) upon the outer'suré
face, as shown in Figure 1 or upon the inner,
cylindrical bore, as shown in Figure 9 or both as '
shown in Figure 13; the dual calibration shown
in Figure 13 being e?’ective to prevent refractive
error which might otherwise result from the thick
wall of the metering tube if the ?oat were viewed
at an angleyother thanthe horizontal.
'.
,
'
' The present invention‘ may be embodied in
52,404,361
jother’spe'ciiic, forms?without departing from the
"spirit or‘lessential attributes thereof, and vitgis
‘therefore desired that the present’embodiments
be considered in all respects as illustrative and
not restrictive, reference being had to the append- .
ed claims rather than to the foregoing descrip
tion vto indicate the scope ‘of the invention‘.
Having thus described my invention, what I
claimgas, new and desire, to protect by Letters
Patent is:
'
1. A rotameter comprising a vertical metering
tube having a metering ?oat adapted for free
up-and-down movement therein, a pair of iden
6, A rotameter comprisinga continuous frame
formed by a pair ‘of identical and interchange
able generally L-shaped juxtaposed elements 'de- 'tachably secured to each other, a vertical meter
ing tube having a metering ?oat therein and be
ing supported intermediate said elements with
the opposite ends of the tube in ?uid-tight seal
ing
relationship
to , connecting
passageways
formed in said elements, said passageways lead
ing to aligned oppositely extending horizontal
outlets and also to aligned oppositely extending
vertical outlets, said horizontal outlets and said
vertical outlets being adapted for alternative con
nection to a pipe-line.
ments constituting the end ?ttings as well as the 15
7. A rotameter comprising a continuous frame
frame for the metering tube, and means, for de
formed by a pair of identical and interchange
tical and interchangeable generally L-shaped ele
tachably securing said elements directly to each
other in operative relation to the ends of the me
tering tube, said frame having aligned horizontal
able generally L-shaped juxtaposed elements,
fastening‘ means detachably connecting said
juxtaposed elements and pulling said elements
openings therein whereby said rotameter can be 20 vertically together, a vertical metering tube dis
connected directly within a horizontal pipe-line.
posed intermediate said elements and supported
2. A rotameter comprising a vertical metering
at its ends thereby, a‘pair of compressible an
tube having a metering ?oat adapted for free up
nular sealing members disposed intermediate the
and-down movement therein, a pair of identical
ends of the tube and the adjacent portions of said ‘
and interchangeable generally L-shaped elements
elements, said sealing members being compressed
constituting the end ?ttings as Well as the frame
upon fastening of said fastening means to pro
for the metering tube, each of said elements hav
vide a ?uid-tight seal intermediate said elements
ing a conduit leading from an opening on the
inner side thereof adapted for connection to one
end of the metering tube and leading to an open- ;
ing on the outer side thereof for connection to a
., pipe-line, and means for detachably securing said
elements directly to each other and for simul
taneously supporting said metering tube inter
and the ends of said tube, said elements having
conduits formed therein leading from the ends of
said tube and terminating in aligned oppositely
extending horizontal outlets adapted for detach
able connection in a pipe-line.
8. A rotameter comprising a frame formed of
a pair of generally L-shaped housing elements
of metal having conduits formed therein, means
detachably connecting said housing elements, a
relatively thick-walled metering tube having a
3. A rotameter comprising a vertical meter~
freely-movable metering ?oat therein and being
ing tube having a metering ?oat adapted for free
vertically
disposed intermediate said housing ele
up-and-down movement therein, a pair of identi_ 40
ments, said frame having aligned horizontal
cal and interchangeable generally L-shaped jux
openings communicating with said metering tube
taposed elements detachably secured directly to
through said conduits, and a pair of plane an
eachother to form the frame for the metering
nular sealing members disposed intermediate said
tube and constituting the end ?ttings thereof,
housing elements and the end Walls of said meter
said elements having aligned horizontal openings
ing tube, said sealing members being axially com
and conduits formed therein, said metering tube
pressed upon fastening of said connecting means
being supported intermediate said elements with
to provide a ?uid-tight end-wise seal interme
the ends of the tube in ?uid-tight sealing rela
diate said metering tube and the conduits formed
tionship to said \conduits, said conduits forming
in said housing elements.
a continuous passageway from said metering tube
9. A rotameter adapted for connection directly
50
to said aligned openings.
mediate said elements with the ends of the tube
disposed in ?uid-tight relationship to the inner
openings of said elements.
4. A rotameter comprising a continuous frame
formed by a pair of identical and interchange
into a horizontal pipe-line comprising a continu
ous frame formed by a pair of generally L-shaped
housing elements of metal having conduits
formed therein, said elements being detachably
tachably secured to each other, a vertical meter
ing tube having a metering ?oat therein and be 55 held in abutting relationship by connecting
means, said housing elements having aligned op
ing supported intermediate said elements with
positely extending horizontal openings commu;
the opposite ends of the tube in ?uid-tight seal
nicating with said conduits and adapted for con
ing relationship to, connecting passageways
nection to the pipe-line or the like, and a meter
formed in said elements, said passagewaystermi
nating in aligned horizontal outlets adapted for 60 ing tube having a freely-movable metering ?oat
therein and being vertically held intermediate
connection to a pipe-line, and a horizontal pin
said housing elements in ?uid-tight sealing re
removably disposed within each of said elements,
lationship with said conduits.
said pins providing top and bottom stops for said
metering ?oat.
10. A rotameter comprising a continuous frame
5. A rotameter comprising a continuous frame 65 formed by a pair of identical and interchange
able generally L-shaped elements having con
formed by a pair of identical and interchange
able generally L-shaped juxtaposed elements de~ ‘ duits therein, means detachably connecting said
elements in abutting relationship with each
tachably secured to each other, a vertical meter~
ing tube having a metering ?oat therein and be
other, a metering tube having a metering ?oat
ing supported intermediate said elements with
therein and being vertically disposed intermedi
the opposite ends of the tube in ?uid-tight seal
ate said frame elements, and a pair of annular
ing relationship to connecting passageways
compressible sealing members intermediate said
formed in said elements, said passageways termi
frame elements and the ends of said ‘metering
nating in aligned oppositely extending horizontal
tube, said annular sealing'members being axially
outlets adapted for connection to a pipe-line.
compressed upon fastening of said connecting
able generally L-shaped juxtaposed elements de
2,404,361
11
means, to provide a ?uid-tight seal between said
metering tube and said conduits.
‘
~
‘ 11. Arotameter comprising a continuous frame
7 ‘formed by'a pair of identical and interchange
able generally L-shaped castings havingconduits
therein, means detachably connecting said cast-4
ings in abutting relationship with each- other, a
metering tube having a metering ?oat therein
and being vertically disposed intermediate said
frame castings, said frame having aligned 'hori- 10
'12
zontal openings therein communicating with said ‘
metering tube through said conduits, and a- pair
‘ of annularscompressible sealing members inter
mediate said frame ‘castings and the ends of said
metering tube, said annular sealing members be
ing axially compressed upon fastening of said
connecting means, to provide a ?uid-tight seal
between said metering tube and said conduits. V
NATHANIEL BREWER.
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