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Патент USA US2118289

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~ May 24, 1938..
E.
BIRKENBEUEL
2,1 18,289
COUPLING FOR COAL WORM SECTIONS
‘
Filed'May 18, 1956
COAL_ Bun
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15
1e 2,
1
, Patented May 24,1938
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v
7
2,118,289
UNITED‘ \STATES'PATENT OFFICE
Edward B. Birkenbeuel, Portland, 0reg., assignor ,
to Iron Fireman Manufacturing Company,
Portland, Oreg.
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Application May is, 1936, Serial Nb. 80,397.
‘1 Claim.
('01. 198-213)
'
This invention relates generally to coal worms ._ shown a coal bin 10 which communicates by
for underfeed stokers and particularly to a c0u-. means, ofva coal tube II with a retort ll. of an
pling for uniting coal worm sections. _
underfeed stoker. Within the tube‘ H are a plu
The main object of this invention. is the pro! rality of sections l3 of coal worm which are br
5 vision of an improved form ‘of coupling for unit- dinarilyidentical, although if desired can be made
ing the sections of an elongated coal worm in a of different pitches or thicknesses of ?ightvto
manner that its thrust bearing may be placed . suit the ideas'of the designer. Each'section l3
near its discharge end for the purpose of sub- consists of a shaft or core l4 upon which is
jecting the screw'to tension ‘instead of placing it “formed a helical ?ight I5. The ?ight I5 is se
10 in compression as is ordinarily the ease. _
~ cured to the shaft‘ M by the welds Hi. This type 10
The second object is to make it‘, possible to re- p of worm is described as being especially adaptable
duce the friction load on a worm (drive by causing the worm to be continually urged toward a
straight line axis and to provide an; inexpensive
for use in connection with my construction._
Each section I3 has one end I‘! of its shaft M
projecting beyond its nearest end of the ?ight I5
while the end I8 of the shaft J4 does notextend 15
15 and rugged form of connection between the worm,
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sections and one which will not offer an. objectionable resistance to the movement‘ of fuel
' through the coal tube.‘
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I
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as far .a'xially as does its end of the ?ight l5.
The distances which the end I‘! projects. from
, ' one end of the section l3 is‘substantially the same
These, and other objects, will become more
20 apparent from the speci?cation following as 'illus.trated in the accompanying drawing, in which:v
as the distance which the end l8 recedes into its
end of the section i3.- In' other words,_when the 20
ends I1 and i8 contact each other, the worm
Fig. '1 is a sectional view through a stoker in-
?ight I5 is continuoua'and its overlapping ends
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stallation having a rear end drive and elongated ~ I!) and 20‘ may be scarfed as shown in Fig. 4 or "
coal screw for which this coupling-is especially
25 useful.
>
_
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merely overlapped asshown' in Fig. 5.v In either
v
event, the ends l9 arels'ecurely joined by means 25
‘ Fig. 2 is aqfragmentary elevation-of one end of
‘of‘ the bolt or rivet 2i.
p
‘
the coal worm section.
I
The discharge end of the assembled sections l3
‘Fig. 3 is a fragmentary elevation of the adja- ~ extend into the retort l2. The endsection there- ‘
cent end of the next coal worm section.
' of- preferably has \a reversed ?ight- 22 formed _
30
Fig. 4 is a fragmentary view showing the preferred form of ?ight fastening. ,.
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thereonto prevent coal from ‘working out of the 30
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retort toward the drive mechanism 23,, which is
' Fig. 5 is a similar view ‘showing as modi?ed
form 0f ?ight fastening.
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' Fig. 61s a transverse section taken along ‘the
35 line 6-4; in Fig. 2.v
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“ ,
_
»load of the coal wcrm.
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'
v a It can be seen byxthe foregoing. that with this 35
Similar numbers of reference refer to similar
parts throughout the several views;
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connected directly to the shaft 24 of the reversed
?ight 22. Athrust bearing 25 carries the‘ axial
construction, elongated worms of any length‘ can ‘
-'
be produced from a few standard lengths of worm
Before entering into an explanation of this .section l3'and when once assembled, the sections .
invention,‘ it must be understood that it has iong will have the characteristics of a one pieceworm"
40 been ‘the practice to make elongated worms in J and will be without the objectionable obstruc- 40
sections and 'to unite these by various forms of tions in the way of couplingsiof the type now in
couplings, most .of these being intended for use '
when the worm was operated in compression. -
common use. I claim?“
,The objection/to most of.these connections, how- _
' 45 ever, resided in the increased resistance which‘~
‘ they offered to the movement of fuel through the“
cOal, tube‘. " With‘ my COI1Stl'l1cti0n.._the core ofthe worm is not enlarged at all and the
. .
.
A conveyor. worm comprising a pair ‘of spiral
conveyor elements ‘having. their adjacent ends 45
joined and having a cylindrical opening there
through, a shaftgforming a core for one of said
?igh‘ts secured thereto and projecting from the '
?ights need not be thickened at the point of . end thereof, the end portion of the second ?ight
Also, the sections may be united or ' being devoid of a core‘ but'having a cylindrical
50 coupling.
separated with little effort, ‘and the’ sections
openingtherein adapted to receivesaid project
thereof are rigidly united in. anal alignment;
Referring in‘ detail to the drawing, there is
ing shaft end.
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~EDWABD l3. BNBEUEL.
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