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Патент USA US2110340

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March 8, 1938.
Filed Aug. 17, 1936
, Patented Mar. s, 1938
Frank Riley, Jr., Houston, Tex., assignor to Miller
Fuel Engineering Company, Houston, Tex., a
corporation of Texas
Application August 17, 1936, Serial No. 96,431
1 Claim.
(Cl. 116—102)
This invention relates to an alarm device.
An object of the invention is to provide a device
of the character described specially designed to
be attached to a boiler, and arranged to be actu5 ated when‘ the level of the water in the boiler is
below a predetermined level; it being the purpose
of the invention to give warning to the attendant
that the water in the boiler is too low.
It is another object of the invention to provide
10 an alarm device equipped with trip means arranged to be released by the in?uence of the‘
steam in the boiler when the water reaches a predetermined level with an actuating device ar-
ranged to be rendered operative upon release of
15 the trip means, and to thereupon actuate the
With the above and other objects in view, the
invention has particular relation to certain novel
features of construction, operation and arrange20 ment of parts, an example of which is given in
this speci?cation and illustrated in the accompanying drawing, wherein: I
Figure 1 shows a side view of the apparatus attached to the boiler, and
Figure 2 shows a sectional view thereof taken
on the line 2—2 of Figure 1.
Referring nowmore particularly to the drawing
wherein like numerals of reference designate
similar parts in each of the ?gures, the numeral
30 l designates the boiler.
otally connected to the latch out beyond its piv
otal connection with the lug ll.
There is a steam pipe I8 extended axially
through the nipple 3 and whose outer end is up
turned and connected into the lower end of the 5
nipple 4. The inner end of this steam pipe [8 is
also upwardly curved so that its inlet end will be
above the corresponding end of the nipple 3.
So long as the level of the water in the boiler
is above the nipple 3, dry steam will be excluded 10
from the tube l3 and said tube will not be thereby
expanded in length su?icient to trip the latch l2.
However, as soon as the water level descends sul?
ciently to admit steam into the nipple 3, said
steam will pass also into the tube l3 and will 15
heat and expand said tube, causing an upward
101111 On the rod "5- ThiS upward pull will actu
ate the latch l2 outwardly, releasing the free end
of the lever ll permitting the weight 9 to- drop,
thus opening the valve 5. The inner end of the 20
steam pipe '8 being upturned, Only dry steam will
be admitted to the whistle 6 and when the valve
is opened, an alarm will be given, indicating the
low level of the water in the boiler. The inner
end of the steam pipe “3 being upturned W111 Pre- 25
vent the discharge of water through the whistle 6,
but Will Permit dry Steam Only to reach Said
The drawing and description disclose What is
‘There is a T-connection
now considered 130v be a preferred form 0f the in- 30
2 which is connected into the boiler below the
normal water level by means of the tubular nipple
3, and connected into and upstanding from the
corresponding end of the T-connection 2, there
35 is a tubular nipple 4 which is normally closed by
vention, by Way Of illustration Only, while the
broad principle of the invention will be de?ned
by the appended Claim
What I Claim is:
A device of the character described comprising 35
a conventional valve 5 and on which, above the
valve, there is mounted the conventional steam
whistle 6. The valve 5 may be opened by the
valve actuating lever ‘l which is pivotally mount40 ed thereon in the usual way. A chain 8 is at-
a T-shaped tubular support mounted on the side
of and adapted to be connected into a boiler, a
steam whistle on one arm of said T-shaped tubu
lar support, a steam pipe extended horizontally
through the support into the boiler and arranged 40
tached at one end to the free end of the lever l
‘to supply steam to the whistle, said steam pipe
and said chain is connected at its other end to
the weight 9. This weight has a bail I 8 to receive the supporting lever II. This lever is piv45 oted at one end to the lower end of the T-connection 2 and its other end is engaged by the de-
having the end thereof which is in the boiler up
turned, a normally closed valve controlling the
supply of steam from the steam pipe to the
whistle, a weight fastened on the lower end of 45
said T-shaped support, releasable means normally
pending pivotally mounted latch [2 whereby the
weight is normally held in inactive position.
Upstanding from the other end of the T-con50 nection 2, there is an elongated tube l3 whose
holding the weight inactive, means connecting
the weight with the valve, means mounted on the
other arm of said support, arranged to be actu
ated by the steam from the boiler when the water 50
upper end is closed by the cap M. The cap M
has a laterally extended lug IE to which the upper
end of the release rod [6 is connected.
The upper end of the latch is pivoted to 2. lat55 erally extended lug I‘! carried by the T-connection
2, and the lower end of the release rod I6 is piv-
in the boiler reaches a predetermined low level
and e?‘ective to release the weight suspending
means whereby the weight is rendered active to
open the valve to permit the discharge of steam
through said steam pipe.
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