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Патент USA US3029991

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April 17, 1962
M. E. WEBSTER ETAL
3,029,981
CONTAINER CONSTRUCTION FOR PRESSURIZED FLUIDS
Filed May 28, 1959
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INVENTOR
MILO
E.
WEBSTER
JOSEPH CASELLA
ATTORNEYS
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3,029,981
Patented Apr. 17, 1962
2
3,029,981
CONTAINER CONSTRUCTION FOR
PRESSURIZED FLUIDS
Milo E. Webster, Rochester, and Joseph Casella, Fair
port, N.Y., assignors to Otto Bernz Co., Inc, Rochester,
N.Y., a corporation of New York
Filed May 28, 1959, Ser. No. 816,485
2 Claims. (Cl. 222-41)
This invention relates to an improved container con 10
struction for pressurized ?uids. The invention more par
vided at the top of the cylinder so that the appliance in
connection with which the cylinder is to be used may,
be attached. The bushing is generally turned from metal
stock and brazed to the top of the cylinder. Additionally,
at the top of the cylinder adjacent to the bushing an excess
pressure valve is provided. This valveyis conventionally
a valve spring loaded shut against the pressure in the
interior of the cylinder and positioned in a machined
housing, which is also brazed in the cylinder adjacent the
bushing.
'
When excess pressure develops in the interior of the
cylinder, as for example, when the cylinder is subjected to
excessive heat, as for example, during a ?re, and the
pressure developed in the cylinder tending to force the
lief valve, such as a portable throw away LP gas cylinder.
Excess pressure relief valves are often provided, and, 15 valve open exceeds the pressure of the spring forcing the
valve closed, the valve will be forced open releasing ?uid
in many cases, required, in connection with containers
from the interior of the cylinder until the pressure again
holding ?uids under pressure. Thus, for example, con
falls below the determined safe maximum value at which
tainers used to store explosive or combustible pressurized
the pressure of the spring acting on the valve exceeds the
fluids, as for example, LP gas cylinders, must be provided
with safety devices for releasing ?uid from the container 20 pressure in the? interior of the container acting on the
when excessive pressures develop in the container interior, , valve.
LP cylinders cannot be completely ?lled with a liqui?ed
as, for example, when the container is subjected to un
petroleum product and may be only partially ?lled so
usually high temperatures. For this purpose an excess
that there exists within the container both a liquid and
pressure relief valve is generally provided. The valve is
conventionally spring loaded and will open when a pre 25 vapor phase. With the conventional positioning of the
excess pressure safety valve, when the container was up
determined pressure is exceeded in the interior of the
right, the vapor would be in contact with the outlet from
container. Fluid is thus released from the container before
ticularly relates to improve a pressurized ?uid container
construction of the type requiring an excess pressure re
turing or explosion.
the excess pressure valve so that if material was released
through this valve the same would ?ow out of the con
In recent years, a number of portable appliances which
operate on LP gas, and particularly propane, have been
widely marketed to the home consumer and various trades.
will ?ow out with a dry feed discharge or a wet feed dis
an interior pressure is developed which would cause rup
tainer in the manner of a ?dry feed? discharge. On the
other hand, if the container is lying on its side, material
charge, depending on the position of rotation of the cyl
inder, e.g., depending on whether the excess pressure valve
lanterns, cook stoves, grilling devices, ?re pots, leak de
tectors, and the like. The commercial success of these 35 was above, to the side, or below the centrally positioned
bushing. The reliability of operation of the valve could
items has been predicated upon a'convenient and safe,
be effected by this. Furthermore, when the relief was of
readily available, and inexpensive source of LP gas.
These appliances include, for example, blow torches,
Due to its highly in?ammable nature, the sale and trans
this dry feed type, very often the same would act as a jet,
propelling the cylinder with great force, in a dangerous
portation of LP gas is strictly regulated. In the past only
relatively large permanent, re?llable cylinders were avail 40 manner and discharging a well de?ned jet which could
able for LP gas. These cylinders were generally too ? itself ignite into a hot, well-de?ned ?ame, thus increasing
the ?re and explosion hazard.
bulky to be considered truly portable and the expense
One'object of this invention is a container for pres
surized ?uid which avoids the above-mentioned disadvan
an authorized station for the most part precluded their
purchase and use by the ordinary amateur handy man 45 tages.
A further object of this invention is a portable LP gas
and the general public.
_
I
cylinder which avoids the above-mentioned disadvantages
It was not until the development of the small portable
and which may be more cheaply fabricated than the con
throw-away LP cylinder that the use of propane operated
ventional LP, gas cylinders, so as to be highly suited as
tools and appliances became widespread among the aver
age purchaser. The portable throw-away LP cylinder 50 a portable throw-away LP gas cylinder.
These and still further objects will become apparent
? could be purchased in any ordinary hardware store, could
from the following description read in conjunction with
?be used interchangeably with various LP appliances, and
the drawings in which:
when the supply of LP gas was exhausted, could be thrown
FIG. 1 is a vertical section of an embodiment of a port
away avoiding the inconvenience and natural purchaser
able LP gas cylinder, in accordance with the invention,
resistance to items that had to be returned and/ or re?lled.
FIG. 2 is a plan view of the cylinder shown in FIG. 1.
In connection with these LP cylinders, just as with any
Referring to the embodiment shown in the drawing, 1
other throw-away time, cost is a primary concern. A par
is a cylindrical metal tube, which has been formed from
ticular problem exists in keeping the cost of LP cylinders
a rectangular metal sheet, as for example, a rectangular
low enough so that the same may constitute a throw
away item since safety requires that they be constructed 60 sheet of steel about .023" thick, such as, by rolling, and
welding together the overlapping edges to form the weld
of heavy gauge steel, must meet extremely high safety re
ed seam 2, which extends longitudinally along the tube
quirements and have an excess pressure relief valve.
wall. This welded seam may, for example, be formed
The conventional throw-away LP cylinders are gener
with a small overlap of the edges and with a mesh Weld.
ally made from sheet steel on a punch press using the con
The top of the cylindrical tube 1 is sealed by the end
ventional deep drawing techniques, a progressive die and 65
closure cap 3 which may be stamped from sheet steel
a multiple number of drawing steps. The cylinders may
and which has an outer diameter which corresponds to
be made with the upper portion and side walls punched
the inner diameter of tube 1 so that the same may be
from a single sheet of steel with the bottom separately
positioned in the tube, as shown, and welded, as for ex
punched and welded on, and preferably may be made in
two halves which are brazed or welded together at a 70 ample, With a lap seam weld at 4. The end closure cap
3 is provided with a central opening 5 into which the
central joint extending transversely around the cylinder.
bushing 6 is positioned. The bushing 6 may have the
A bushing for the attachment of a tap connection is pro
and inconvenience entailed in having the same re?lled at
3,029,981
11
structure as described in co-pending application Serial No.
747,974, ?led July 11, 1958, and may be provided with
the ?ange 7 which is roll welded to the portion of the end
closure 3 surrounding the opening 5. The bushing may
be welded into position on the closure 3 prior to joining
stem 10 and the hollow stem of the tap connection and
out of the tap connection. The tap connection and its
use is conventional and well known and its embodiment
is described in US. Patent 2,793,504.
When the pressure in the interior of the cylinder ex
ceeds a pre-determined safe value, as for example, when
a cylinder becomes over-heated, such as during a ?re, the
internal pressure of the ?uid will force the valve 21 open
the closure 3 to the cylindrical tube 1.
The bushing 6 has an annular outer wall portion with
the rolled-on male thread 8; is reverse bent at 9, and ex
against the pressure of the spring 23, thus releasing ?uid
tends in the form of a central tubular stem 10 coaxially
with the outer wall portion de?ning an annular space 10 through the opening 19 and thus again reducing the pres
sure in the cylinder interior.
between it and the outer wall portion. The tubular stem
By having the discharge opening 19 for the excess pres
extends through the opening 5 to the interior of the con
tainer. The interior of the tubular stem is threaded at
11 and a' conventional automobile tire core valve 12 is
sure valve at one end of the cylinder, and the normal
discharge through the tubular stem 10 at the opposite
screwed in place engaging these threads 11. Additionally, 15 end of the cylinder, a more reliable and trouble-free op
a rubber O-ring 13 and an aluminum retaining ring 14
are positioned in the tubular stern above the tire core
valve.
eration of the excess pressure valve is achieved.
With
the normal positioning of the cylinder, either upright or
on its side, the discharge opening 19 for the excess pres
sure valve will be in contact with the liquid phase in the
steel of comparable thickness to that of the cylinder wall. 20 cylinder. The degree the excess pressure valve 21 will
open will depend on the pressure build up in the interior
The sheet steel may ?rst be punched in the form of a disc
of the cylinder and much better and more rapid relief
and then, using a punch press machine and progressive
of the excess pressure will be achieved for any degree of
die, as for example, with 12 stages, it may be punched out
opening of this valve. The jet discharging from the ex
into the shape shown. After punching the same may be
placed in a chucking machine and the external male thread 25 cess pressure valve will be more diffused and will not be
as de?nitely de?ned as is conventional so that even with
8 rolled on and the internal female thread 11 tapped into
position.
a more e?icient release of the pressure, the tendency to
jet propel the cylinder will be substantially decreased.
The bottom of the cylindrical tube 1 is sealed with the
Furthermore, the tendency of the jet to ignite will be de
end closure 15 having an outer diameter corresponding
to the inner diameter of the cylindrical tube 1. The bot 30 creased, and, if ignited, a much cooler ?ame will result.
While the invention has been described in detail with
tom closure is welded in place with a lap seam weld at
reference to the speci?c embodiments shown, various
16. The end closure may be punched from sheet metal
changes and modi?cations which fall within the spirit of
having a comparable or slightly thicker cross section than
the invention and the scope of the appended claims will
that of the tube 1.
The bottom closure 15, as may be noted, has a some 35 become apparent to the skilled artisan. The invention,
The bushing may be produced from ordinary sheet
what domed arched shape with a cylindrical rim or ?ange,
therefore, is only intended to be limited by the appended
at which the lap seam weld at 16 is effected. In the
center of the end closure 15 an opening 17 is provided.
claims or their equivalents wherein we have attempted to
claim all inherent novelty.
What is claimed is:
1. A portable throw-away LP gas cylinder comprising
opening 5 and as the opening 5 is in the form of a round 40
a cylindrical metal tube with a longitudinally Welded seam,
hole, though preferably of smaller diameter than the open
a ?rst end closure cap Welded on one end of said tube,
ing 5, an elongated tubular housing 18 is positioned in
a circular opening centrally de?ned through said ?rst end
the hole 17 and sealed to the edges thereof by welding.
closure, a bushing having an annular outer wall portion
This housing 18 preferably has the construction as set
forth in co-pending application 747,974, and may thus 45 with an annular ?ange at one end inwardly reversed bent
This opening is preferably in axial alignment with the
be punched from a disc of sheet metal in a similar man
ner to the bushing 6. The housing 18 has a small central
hole 19 and a female threaded portion 20 which is tapped
in place. A pressure release valve 21 of conventional
at the other end extending in the form of a central tubu~
lar stem coaxially with said outer wall portion and de?n
ing an annular space between it and said outer wall por
tion, said tubular stem coaxially extending in said cir
construction is screwed in place in this housing 18. The 50 cular opening, and said annular ?ange being Welded to
the circumferentiial portion of said circular opening, a.
aforesaid pressure release valve has a central stem 22
extending coaxially in the center of the housing, a spring
closure valve positioned in said tubular stem, a second
end closure cap welded on the opposed end of said tube,
a second circular opening centrally de?ned through said
The spring 23 presses the rubber seal 25 against the
opening 19 sealing this opening in a pressure-tight man 55 second end closure, a tubular housing extending into said
23, and a closure member 24, with a rubber seal 25.
ner. The housing 18 may be welded?in place on the end
tube and welded to said second end closure at the cir
cumferential portion of said second circular opening, and
closure 15 prior to the end closure being welded to the
a spring loaded excess pressure safety valve in said tubu
tube 1.
lar housing.
After the entire cylinder is assembled and tire core valve
2. A portable throw-away LP gas cylinder, according
12 and the excess pressure relief valve 21 positioned in 60
to claim 1, in which said closure valve is an automobile
place, the cylinder may be charged with an LP gas such
as liqui?ed propane and is thus ready for sale and use
tire core valve.
in the manner of conventional portable throw-away LP
References Cited in the tile of this patent
cylinders.
When it is desired to connect an appliance to the cyl 65
UNITED STATES PATENTS
inder, a tap connection on the appliance to be used is
1,243,733
Gri?ith ______________ __ Oct. 23, 1917
screwed over bushing 6 in engagement with the thread
2,172,311
Thomas ______________ __ Sept. 5, 1939
at 8. The tap connection has an elongated, hollow stem
2,240,791
Leeseberg ____________ __ May 6, 1941
which extends into the tubular stem 10, in sealing en
Cooper ______________ __ Mar. 7, 1950
gagement with the O-ring 13 pressing on the stem of the 70 2,500,119
2,660,343
Charpiat ____________ __. Nov. 24, 1953
tire core valve 12, thus forcing the tire core valve open
and allowing the LP gas to be tapped through the tubular
2,822,961
Seaquist ____________ __ Feb. 11, 1958
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