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Патент USA US2137880

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Nov. 22, 1938.
' E. -w. LOESSER
Filed June a, 193'! >
2 Sheets-Sheet 1
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Nov. 22; 1938.
2 Shééts-Sheei 2
Filled June 3, 193'?
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Patented Nov.
LOW mm 00ml- mon snail
ErneetW. museum-‘mustang
Application June 3, i837, sci-n1 No. 146.281
4 Claims. (0!. ecu-s4)
This invention relates, generally, to improve
ments in control apparatus actuated by water
level conditions in steam boilers, especially boil
it. The Joint between the sections II and II
is sealed by an interposed gasket l3. The-assem
bled sections provide an'interior closed cham
ers and furnaces of the house heating type; and ber ll.
5 the invention has; reference, more particularly,
The. ?oat chamber is preferably mounted in 5
to a novel control apparatus of the kind men-. connection with the boiler Ii in association with
tioned, which is adapted to open and close an the water level ‘gauge glass ?xture it with which
electric circuit supplying power to the fuel burner ' the boiler is provided, and to this end suitable‘
apparatus of the boiler, to a feed water pump pipe ?ttings connect the bottom portion of the
10 apparatus, or to means tor actuating feed water chamber ll with the lower pipe connection I‘! 10
admission valve mechanism, as the case may be. leading from the. boiler II to the lower portion
The invention has for an object to provide a of the cause glass ?xture. As shown, thme ?t
water level actuated control apparatus including tings comprise a T I! which is included in said
a ?oat chamber, adapted ‘for connection in com
lower pipe connection l1 and a branch pipe."
16 munication with the water compartment oi’ a' which extends between said T II and the lower 16
boiler, and a ?oat within said chamber, together port 2| formed in inner section II of said cham
with means for both mounting the ?oat for 05- j ber l4. Similarly, suitable pipe ?ttings'connect
cillation within the chamber, while at the same the upper portion of the chamber II with the
time sealing said chamber at the point where the upper pipe connection 21 leading from the boiler
20 ?oat arm projects exteriorly therefrom; said lat- ' ii to the upper portion oi’ the gauge glas ?xture. 20
ter means comprising a metallic bellows so con
structed as to be freely ?exible, to permit op
erative swing of the ?oat and its arm, while at
. the same time being strongly resistant to longi
25 tudinal contraction and expansion under high or
low pressures communicated to the chamber in
terior, to the end that operative condition of the
?oat is assured at all times, and the operative
relation of the exterior end of the ?oat arm to
30 switch means adapted to be controlled thereby
- is maintained against derangement.
Other objects of this invention, not at this
As shown, the latter, fittings comprise a vertical
pipe' 22 which extends from the upper port 23
formed in inner section II of said chamber l4,
and to the upper end of which is connected, by
an elbow 24, a branch pipe 25 which extends :5 Q
to a T 20 which is included in the upper pipe
connection 2i 0! the gauge glass ?xture. By
the connecting arrangement thus provided, the
?oat chamber is so disposed as to receive water
from the boiler II in such manner that said ?oat 30
chamber is substantially ?lled with water when
the water in the boiler, and correspondingly in
time more particularly enumerated, will be un
the gauieglas, stands at a normal desired level.
derstood from the following detailed description ’ The elite: section H of the ?oat chamber ll
86 oi'the same.'
is provided with an outer face wall 21, from 35
An illustrative embodiment of th invention - the exterior side of which projects an annular
is shown in the V-accompanying drawings. in . ?ange 28. Upon the exterior =0! said face wall
21 is mounted an electric circuit control switch
Fig.1 is-an elevational view of the low water to be hereinafter more particularly described.
40 control means operatively mounted in connec
The switch mechanism is enclosed within a re- 40
tionwithabo'ilertobeservedthereby; Fig.2
movable cover-cap II‘ which is tei
is a vertical section-through the same, taken on
gaged over and suitably secured to said annular
line 2-! in Fla-gal; Fig. 3 is an enlargedi'ace ?ange ‘ll.
view in part, with cover cap of switch compart-.
Located within the interior of the ?oat cham
‘I ment removed; and Idg. 4 is an enlarged sec
ber ll, so as to be buoyantly supported by the '45
tional view of the novel ?exible sealing support water content thereof, is a ?oat member II, pref
for mounting the ?oat and its arm in operative erablyintheiormoi'aholhwmetallicball,
‘relation to the ?oat chamber.
totheetubil oiwhichlssecureda?oatarmn.
Similar characters of reference are employed
'l'henovelmeans for mountingthe?oatmem»
In in the above-described views, to indicate corre
-water level within‘the
while at
Referring to the drawings, the ?oat chamber _-thesametimemaintainingawater-tightseai
of the apparatus is preferably made in two sec .where theexteriorlyproiec?ng portion-attire
tions, via. an inner section I. and an outersec
I tion ll,thesamebeingsecuredtogetherbyboite
?oater-m extends through the
A threaded bushing as having an enlarged or
?anged inner end 34 is threaded from the inner
side outwardly through the face wall 21 of cham
ber section I I, until its ?anged inner end 34 abuts
said wall; a sealing gasket 3! being interposed
between the wall and said ?anged inner end 34.
Said bushing is provided with a bore I0 extending
axially therethrough, a portion 31 of which is of
reduced diameter. Extending into the reduced
10 portion 31 of the bushing bore is the outer neck
portion 38 of an internal tubular bellows ele
ment 39. Said neck portion 38 is suitably secured
and Joined to the bushing 33 so as to provide a
leak-proof joint. Said internal bellows element
39 is provided at its opposite end with an inner
neck portion 40, within which is mounted an
end plug 4|, the same being suitably secured and
joined thereto so as to provide a leak-proof joint.
Said end plug 4| is threaded to receive the ?oat
20 arm 32, which is suitably secured thereto, pref
erably by a threaded connection as shown. Said
?oat arm 12 is provided with an extension 42 of
reduced diameter which passes through the end
plug 4| and thence downwardly through the in
25 terior passage of said bellows element 39 and
through the outer open end of the internal bush
ing element 31 and the bore of bushing 33. Pref
erably said extension 42 terminates in a further
reduced extremity to form an actuator finger 43.
Surrounding said internal bellows element 38,
so as to be disposed in spaced concentric relation
thereto, is an external bellows element 44. Se
cured to and between adjacent ends of the inter
nal and external bellows members "-44 are .end
plates 45, these parts being so secured and Joined
together, as by brazing, soldering or like means,
as to provide leak-proof joints, thus forming in
termediate the internal and external bellows ele
ments a closed and sealed annular chamber
40 which is filled with a suitable ?uid material L
projects from the exterior of the ?oat chamber
face wall 11, is a carrier plate 41 upon which is
adiustably supported a clip plate 48, the clip arms
4! of which are adapted to embrace and carry a
mercury tube contactor switch 50.
Mounted upon bracket lugs 5|, with which the
?oat chamber face wall 21 is provided, is a panel
52 having binding posts 53 and 54. One pole, as
N, of the switch 50 is connected, by a ?exible
conductor 56, to binding post 51, and the other
pole, as 51, of switch 50 is connected by a ?exible
conductor 56' to binding post 54. The cover-cap
29 is provided with suitable coupling means 58
to which may be secured outgoing ?exible con
duit 59 through which conductors of the electrical
circuit to be served by the switch 50 may be led
and respectively connected to the binding posts
I! and 54. The actuator ?nger 43, which extends
from the ?oat arm extension 42, is operatively
coupled to the pivoted carrier plate 41 by en 20
gaging said ?nger through a perforation 60 with
which said carrier plate is provided.
Assuming the switch 50 operates to normally
maintain closed an electrical circuit, such e. g. as
that serving the fuel burner and delivery mecha
nism with which boiler i5 is equipped, then the
switch and its carrier is so arranged as to nor
mally incline in a direction adapted to dispose its
mercury content of the switch in bridging rela
tion to the pole terminals thereof when the ?oat
member II is in an uplifted position as governed
by a normal water level condition in the boiler and
?oat chamber. Such uplifted position of the ?oat
member 38 swings downward the actuator ?nger
43 and down tilts the switch carrier and the switch
to such normal closed condition (see Figs. 2 and
3). If water in the boiler and consequently in
the ?oat chamber falls below normal desired level,
then the ?oat member ll ‘will drop, thereby swing
such e. g. as oil of desired viscosity, alcohol, or
ing upward the actuator ?nger 43, and conse 40
quently thereby uptilting the switch carrier and
other liquid.
It will be obvious from the above description
the switch, so that the mercury content of the
latter will move out of bridging relation to the
that the bellows structure constitutes a ?exible
switch pole terminals, thus opening the switch
45 connection between the ?oat chamber wall and
and interrupting the electrical circuit to cause
the ?oat arm which is adapted to readily yield to
stoppage of fuel burner and delivery operation,
the movements of the ?oat as it rises and falls in
response to changes of water level within the
until such time as the water in the boiler and
?oat chamber is restored to normal level.
?oat chamber, thus in e?‘ect, providing the equiv
It will be obvious that, if desired, the switch
50 alent of a pivotal connection. Owing to the pro
It may be arranged to serve an electric circuit
vision of the internal bellows element ll in com
controlling the operation of an electrically driven
bination with the external bellows element 44,
whereby a closed annular chamber between the
two is formed, said annular chamber may be
55 filled with a suitable liquid, so that, although the
?exing of the structure freely occurs, the bellows
structure is internally braced against undue lon
gitudinal contraction and expansion, which, it al
lowed to occur might prevent proper movement
of the ?oat and proper actuation of the switch
mechanism which is operated by ?oat move
ment. The liquid content of the bellows struc
ture is of especial advantage in bracing the lat
ter against contraction or compression in the
as event high pressure is developed in the boiler and
communicated to the ?oat chamber, for, should
the bellows structure be subject to contraction of
compression from such cause, it might become so
rigid that the ?oat would fail to drop upon ab
70 normal lowering of the water level, and conse
quently timely operation of the switch mechanism
feed water pump, or which controls an elec
trically actuated feed water admission valve
means, rather than the circuit serving the fuel
burnerand delivery means. It will be under
stood that the ?oat controlled actuating means
per se, including the novel laterally ?exible but
longitudinally braced double walled bellows
structure for pivotally mounting the ?oat arm
in such manner as to allow its tree end to pro
Ject 'exteriorly from the ?oat chamber for co
operation with mechanism desired to be actu
ated in response to ?oat movements, may be
utilized in many other connections and for many
purposes in addition to the specific application
thereof as a low water control for boilers. It
is therefore intended that the invention is to
be viewed broadly as to the ?oat controlled so
tuating means per se.
It will be'understood that many widely differ
might fall under critical conditions and the de- ' ent embodiments of this-invention could be made
sired safety function of the apparatus would be without departing from'the scope thereof. It is
therefore intended that all matter contained in
75 Pivotally mounted on a fulcrum stud 44, which’ the above description or shown in
panying drawings-shall be interpreted as illus
trative and not in a limiting sense.
Having now described my invention, I claim:
1. In a control means having a buoyant‘ ?oat
operative in a ?oat chamber, said ?oat being
provided with an arm having a free ‘end por
tion projecting exteriorly from said’ ?oat chamber
8. In a control means having a bouyant ?oat
operative in a?oat chamber, said ?oat being
provided with an arm having a free end por
tion projecting ‘exteriorly from said ?oat cham
ber, a double walled sealing bellows structure
secured to and between the ?oat arm and a wall .
of said ?oat chamber, said bellows structure
for cooperation with mechanism to be actuated providing a sealed annular space intermediate its
by ?oat movement, a laterally ?exible double, walls, a liquid mass ?lling said annular space,
10 walled sealing bellows structure secured to and and an electric circuit control switch means 10
betweenthe ?oat arm and a wall of said ?oat , mounted exteriorly of said ?oat chamber and
chamber, said bellows structure providing a
sealed annular chamber intermediate its walls,
and a liquid mass ?lling said annular chamber
to brace the bellows structure against longitudi
nal compression.
2. In 'a control means having a buoyant ?oat
operative in a ?oat chamber, said ‘?oat being
provided with an arm having a free end portion
20 projectingzexteriorly from said ?oat for coopera
tion with mechanism to be actuated by ?oat
‘movement, a laterally ?exible sealing bellows
structure comprising, an internal bellows ele
ment having an open outer end and a closed
25 inner end, means to secure the open outer end
of said internal bellows element to the ?oat,
chamber wall and so as to openexteriorly through
the latter, said ?oat arm being secured to the
closed inner end of said internal bellows element
30 and the free end portion of said ?oat arm pass
ing outwardly through the latter and its outer
open end, an external bellows element concen-_
trlc to said internal bellows element and form
ing therewith an intermediate sealed annular
chamber, and a liquid mass ?lling said annular
adapted to be opened and closed by ?oat con
trolled movement of the exterior end portion of
said ?oat arm.
4. In a device of the kind described, a ?oat 15
operative within' a ?oat chamber, a ?oat arm,
a laterally ?exible sealing bellows structure com
prising, an internal bellows element having an
open outer end and a closed inner end, means
to secure the open outer end of said element to 20
the ?oat chamber wall and so as to open ex
teriorly through the latter, an external bellows
element concentric to said internal bellows ele
ment and forming therewith an intermediate
annular space, a liquid mass ?lling said annular
space, means to secure the closed inner end of
said internal bellows element to said ?oat arm,
said ?oat arm having an extension passing out
wardly through said internal bellows element
exteriorly of said ?oat chamber, and an electric .
circuit control switch means mounted exteriorly
of said ?oat chamber and adapted to be opened
and closed by ?oat controlled movement of said
?oat arm extension.
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