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Патент USA US2118289

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~ May 24, 1938..
2,1 18,289
Filed'May 18, 1956
1e 2,
, Patented May 24,1938
Edward B. Birkenbeuel, Portland, 0reg., assignor ,
to Iron Fireman Manufacturing Company,
Portland, Oreg.
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,
sections and one which will not offer an. objectionable resistance to the movement‘ of fuel
' through the coal tube.‘
. ,~
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
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.
merely overlapped asshown' in Fig. 5.v In either
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.
the coal worm section.
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 _
Fig. 4 is a fragmentary view showing the preferred form of ?ight fastening. ,.
thereonto prevent coal from ‘working out of the 30
retort toward the drive mechanism 23,, which is
' Fig. 5 is a similar view ‘showing as modi?ed
form 0f ?ight fastening.
‘ -.
' Fig. 61s a transverse section taken along ‘the
35 line 6-4; in Fig. 2.v
“ ,
»load of the coal wcrm.
“ ‘
v a It can be seen byxthe foregoing. that with this 35
Similar numbers of reference refer to similar
parts throughout the several views;
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.
I _
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