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July 11, 1950
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Filed April 25, 1948 ‘v
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SAMUEL H.>Yos-r,
Patented July 11, ‘1950
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,SarhueI~"H.-f$0513}Worthington;i‘~()hio,assignoib-td I‘
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The ‘.leifreyzManufacturing vCompany,facorpo
ration of Ohiov ,
{application Amines, ierajsensino.22.932‘
This-‘invention relates to a ?ame arrester, and
an object of the invention. is to provide a very
simple improved device of ‘the above mentioned
Other objects of the invention:willrappear4here~
inafter, the novelrfeatures and combinations be
ing set forth in theappended claim.
In the accompanying drawing: Isis; an elevational rviewlof a controller
to which a pair of my improved ?ame arresters
have been attached}Iandl?v
Figi.2;is a detailed view,~,part in section. and
part in: plan, showing the construction-pofqsaid
is'aone-piecesolid member andjwhich-has a corr
tinuous ‘ cylindrical external‘ surface I 9 generally
coextensive with‘, the cylindrical“ ‘surface , ‘ l 6 and
_ which,v is, coextensivegtherewithifor at 1(-_:'va‘st"1_
‘ inch“ and"preferablyffslightlyfin"excess thereof,
such as’1i%inches1-1
The, plug‘! 8‘ iisfalsgpreferamy' provided‘ with a
circurnferential‘_'groove‘f20‘whichjat least in part
is iqppqsite the. $111025“; the; two“ grooves l1" and
2I!”cooperating-‘to“formywhat ‘is in effect *a single
circum'ferentialfgroove o ’ "passageway*aroundfthe
external‘ lp‘eriplieryl‘o?the "plug ‘ l 8 '-andfthe 'i‘rie
ternaluperipheryfof lihecup l3. ,The bottom or
left-‘hand end ‘of’ ‘the-plug‘ :l 81;“ a's-vi‘ewed'i in "Fig. 2
Flame arresters are required in permissible 15 of the drawing, is spaced slightly from the bots
tom of the cup 13, this spacing not being par
equipment to prevent explosions when said equip
ment is used in gaseous coal mines. In connec
tion with controllers or other spark producing
equipment used with coal mining machines it is
desirable to maintain a flow of air through the
enclosed casing at all times so that the ionized
air produced whenever a contact is open will not
form suf?cient nitrous acid which is allowed to
form will seriously attack the copper, insulation
and, in fact, many operating parts of the con
ticularly critical, though preferably slightly in
excess of the spacing between the surfaces [6 and
IS. The spacing between the surfaces It and i9
is somewhat critical. It is preferably of the order
of .020 inch.
Adjacent its right-hand end, as viewed in Fig.
2 of the drawing, and at its center the plug l8
is provided with a conduit-forming opening H
which is preferably screw-threaded at 22 to re
ceive a screw-threaded ?tting whereby it may
be attached to the housing ID or the like. Open
ing 2! extends into a central axial conduit lead
ing vto the interior of the plug 18, from which
As illustrated in Fig. -1 of the drawings, the
controller I0 is provided with a pair of ?ame ar
resters ll of similar construction, one of which
is connected to a ?exible conduit l2 which de 30 there is a plurality of radial conduits 23 ex
tending to the groove 20, thus providing branch
rives a flow of air from a fan or blower, the air
passageways from the opening 2| to the periph
?owing through the ?ame arrester II and into
eral groove l'l—20.
the totally enclosed housing of the controller
The plug I8 is also provided with a peripheral
I'll, thence out of said housing through the other
24 and with threads to receive the threaded
?ame arrester I l at the left-hand side of said
top of the cup I3. The ledge 24, of course de
controller, as viewed in Fig. 1 of the drawing.
termines the final position of the plug l8 with
The flame arrester of my invention is very sim
respect to the cup l3, thus positioning the bot
ple,,yet it has been found entirely satisfactory
tom of the plug l8 from the bottom of the cup
and has been approved by the Bureau of Mines.
It comprises essentially two main parts. Said 40, l'3. If desired, a sealing wire 25 may lock the
two principal parts of the arrester ‘ll together,
two main parts are a cup l3 which has a nipple [4'
and a similar sealing wire 26 may look the ar
thereon adjacent the center and bottom of the
rester II to the housing I0.
cup, which nippleis' bored to provide a conduit
As illustrated in Fig. l of the drawings, the
l5 leading to the center and bottom of said cup.
The cup has a generally cylindrical shape and 45 two arresters H are connected vto the housing
II) by virtue of ?ttings between said housing
of particular signi?cance is the inner cylindrical
and the threaded openings 22. Air is fed to
surface I6 which extends for at least an inch
the nipple M of the right-hand flame arrester
and preferably slightly in excess of one inch;
H, the left-hand ?ame arrester having its con
for example, it may extend 1% inches.
Adjacent the right-hand edge of the cylindri 60 duit [5 in direct communication with the at
mosphere. Air from a fan or blower is delivered
cal surface I6, as viewed in Fig. 2, the cup I3 is
by conduit l2 to the conduit or passageway l5
provided with a peripheral internal groove l'1,
of the nipple M where it spreads through the
adjacent and to the right of which it is threaded,
area between the end of the plug l8 and the
as clearly illustrated in the drawing. The cup
13 receives a generally cylindrical plug 18 which 55 bottom of the cup [3, ?owing radially outward
to a position where it can ?ow axially between
the cylindrical surfaces I 6 and I9, thence into
the circumferential groove l1-20 from where it
ment of my invention, what I desire to secure
by Letters Patent of the United States is:
A ?ame arrester for an electrical controller
can freely ?ow from the radial bores 23 into the
or the like comprising a two piece device in
said opening 2| by way of the central conduit 5 cluding a cup having a cylindrical inner surface
communicating therewith and with said bores
and a, central conduit leading to the interior of
Should an explosion take place within the ene
said cup, a one-piece plug threaded into said
cup having a continuous outer cylindrical wall
closed controllerbox I 0 the ?ames will be ar
near to but spaced slightly from said cylindrical
rested or quenched before reaching atmosphere, 10 inner surface and having opposite closely ad
since they will take a reverse path from that ;
jacent surfaces about .020 inch apart and ex
just described for the incoming air, the ?ame
I tending for at least 1 inch along the axis of said
arresting taking place principally as the ‘hot
cylindrical surfaces, and conduit means extend
gases pass between the surfaces [6 and I9. Some
ing ?rst into the center of said plug then radi
arresting may take place between the end of
ally thereof, said plug and cup cooperating to
the plug l8 and the bottom of the cup l3, but
provide a circumferential groove adjacent the
this path is not particularly relied upon for the
.ends of said radial conduit portions and at the
?ame arresting to function. “Obviously; either" ' periphery of said plug, the end of said plug ad
?ame or air can travel in either of the reverse
jacent said ?rst mentioned conduit being spaced
directions through the l?ame arrester, and the 20 from the bottom of said cup.
function and operation will be the same in either
case. As a matter of factythenormal air flow
will travel through the right-hand‘?ar‘ne ar-'
rester II in one directionvjleading to the con
troller l0, and it will ?ow through the left-hand 25 The following references are of record in the
file of this patent:
arrester II in a relatively reverse direction.
Obviously those skilled in the art may make
various changes in the detailsv and arrangement
‘ Name
of parts without departing from the spiritand
Kruppa ______ _'_____ July 1, 1924
scope of the invention as de?ned by the claim 30 1,499,461
hereto appended, and I thereforewish not to be
restricted to the precise construction herein
Having thus described andv shown an embodi
Austria _________ __ Apr. 10, 1933
Germany ________ __ June 20, 1931
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