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De.; 3, 1946. ,
c. M. DoYLE
Filed Nov. 5, 1942
. ,.1.l .«|flrl
2 sheets-sheet 1
Dec. 3, 1946.
Filed Nov. 5, 1942
2 Sheets-Sheet 2
Patented Dec. 3, 1946-
conm M. Boyle, salem, omo, mimo»- to 'rhs
Salem Engineering Company, Salem, Ohio
Appucauun 'November s, 1942, serial No. 464,558
3 Claims. (ci. zes-a2)
This invention relates to drying apparatus and
the parts through the units of the complete proc
more particularly to a unitary, portable, self-con-essing line. Also the present apparatus is so de
tained assembly which is operative to dry small - vised that an additional dryingdrum may be
pieces such as small metal parts.
readily attached to increase the length of the
The primary object of the invention is the pro- '4
drying chamber which is ydesirable in certain sit
vision of a highly ef?cient apparatus of the char
acter stated which is simple in design, compact
The above and other objects and advantages'oi
and economical in construction, which may be
the invention will become apparent upon a con
completely assembled at the factory, and which
sideration of the following detailed speciñcation
may be readily moved about the parts manufac
and the accompanying drawings wherein there is
turing or processing plant as needs dictate. To
specifically disclosed a preferred practical em
this end all the operative parts of the apparatus
bodiment of the invention.
are assembled on a unitary frame of minimum
dimensions whereby the floor space required for
the installation of the apparatus is materially
less than in comparable devices heretofore pro
posed for performing the same functions. The
frame is carried on skids and the major part of
the necessary apparatus constituting the 'assem
bly is positioned in an out of the way location
above the drying chamber.
» A more specific object of the invention is the
provision, in an apparatus of the character de
scribed, of an improved arrangement for gener
ating the heat required to efiect a rapid dry
ing of the parts and for injecting the heat thus
generated into the drying chamber. These im
provements enable the complete apparatus to be
materially simplified and compacted and reduces
heat loss to a minimum whereby a greater etil
ciency of operation may be attained.
Another object of the invention is the provi
sion, in apparatus of the character described, of
In the drawings:
Figure 1 is a side view, partly in section, of an
assembled drier constructed in accordance with
the principles of the invention;
Figure 2 is a transverse section, with certain
parts. omitted, taken generally along the line
Il-H of Figure 1;
Figure 3 is 'an end view of the apparatus oi'
Figure 1; and
Figure 4 Vis a fragmentary side view'taken from
the position IV-IV (Figure 2).
Referring to the drawings,lreference numeral
In designates a cylindrical drum having a helical
material moving baiiie or baiiies II positioned
against the inner surface of Vits side wall. One
end of the drum I0 is funnelled at I2 to provide
an inlet for the pieces or parts to be dried and
30 it will be understood that upon rotation of the
drum I0 the parts entering at I2 will be caused
to move longitudinally along the drum and be
discharged at the end I3. The parts, of course,
a practical arrangement whereby a material re
will remain in the bottom of the drum and will
cuperative eiîect is attained without sacrificing 35 be tumbled about to a certain extent as they pro
the eiliciency or speed of drying.
gress through the drum.
This turning move- '
A further object of the invention is the provi
ment is of material aid in hastening the drying
sion of a unitary and self-contained small parts
drier which may be readily coupled directly with
« Adjacent the end I3 of the drum III is a wear
other- equipment utilized in the particular process 40 band I4 which is arranged to be engaged by roll
involved whereby the carrying out of the process
ers l5 journaled in a cradle I6 which, in turn,
or processes in a more continuous and economical
manner may be effected.
For this purpose the
is pivotally mounted on a support I1 by means of
a pivot pinA I1' A ring I8 is ilxed to the opposite
end of the drum and pressed onto the ring I8 is
ployed i-s` so constructed and positioned in the
a combined supporting and driving gear I9. As
assembly that it may be directly and mechan
lshown in Figure 1, the outer smooth races of the
ically coupled’with the revolving drums of pre
member I! are engagedby the flanged rollers
ceding equipment. This preceding equipment
20 while the teeth of the gear are engaged by a
- may, for example,` consist of a combined pickling
spur gear 2| which, in turn, is driven by a pinion
and washing unit utilizing one or more perfo 50 22 fixed to the shaft of a geared motor 23. It
rated drums at each stage. In this case the last
will be understood that at least two circum
washing or drying drum would be connected with
ferentially spaced sets of rollers 20 will `be em
the drying drum of the present apparatus and all
ployed to lend lateral stability to the drum. 'I‘he
the moving parts would rotate in unison to pro-l
rollers 20 as well as the- gear 2|, motor 2l and
vide for the uniform and uninterrupted ilow of 55 supports I1 are mounted lon abase consisting of
revolving drying v and conveying chamber em
the spaced iongitudinauy extending skids u and
an auxiliary source of drying air is provided by
the transverse angle sections 26 and 26.'
Extending upwardly from and rigidly secured
to each of the skids 24 are two longitudinally
` one or more slide valves 63' located in the wall of
the chamber 40 adjacent the llame end oi the
burner 42. The air inlet to the blower 46fis
provided by a chamber 64 from which extends a
large conduit 66 leading from the space about
the drum I0 and within the chamber „formed
by the walls 32 and 33 as indicated in
' spaced frame section members 21 which are inter
connected at `their upper ends with transverse
and longitudinal members 26 and 26, respectively,
to provide a box-like frame structure for the sup#
’Figures 2 and 4. To insure that an ade
port of the parts to be described below. As shown
in the drawing, ,suitable gusset plates are fastened 10 quate supply of air is always delivered by the
into the corners of the frame to provide the proper ,
blower 46 a slide valve 66 may be provided in the
strength and rigidity.
conduit 56 to take in as much outside air as
may be required.
In operation, with the blower 43 furnishing a
' and al which' are welded or otherwise suitably
secured to the stanchions 21 is a casing having 15 supply of air under pressure to the conduits 62
end walls 32 apertured to receive the drum III` » and 46, if the burner 42 isnow lit combustion will
take place in the chamber 4I!` and the volume of
and concentrically spaced side walls 33 and 34.
the hot gaseous products of combustion will be
The space between the walls 33 and y34 is fllled
Aaugn'iented by the air taken in through the valve .
with suitable insulating material 36 -such as min
Supported on the semi-cylindrical hangers 30
eral wool, for example.
20 or valves 63’.
Projecting into the end I3 of the drum'lll
and extending along the axis oi' rotation of the
drum for substantially the entire length of the
drum is‘ a pipe 36 which, as shown in Figure l,
is closed of! at its inner end 31. In the par 25
ticular apparatus chosen for illustration the lower .
The hot gases and air. thus pro
vided will be withdrawn from the chamber 46`by
the decrease in pressure created in the chamber
by the ilow of the air stream from the nozzle 63
through the restricted passage 60 as will be well
understood. The gas and air from chamber 46
will be mixed with the air issuing from the nozzle
63 and this mixture will be forced into the pipe
36 through the conduit 6I. Assuming the motor
portion of the pipe 36 is provided with live air
discharge openings 38 which are positioned »to
23 to be in rotation, as the parts or other oblects ‘
one side of the vertical plane passing through the
central axis of the pipe. ’I‘his is the side on 30 to be dried are charged through the end I2 the
same will fall into the space convolutions be
which the parts being dried tend to accumulate
tween the baiiles Il and be moved longitudinally
upon rotation of the drum in the direction in
through the drum directly opposite the air dis
dicated. The openings 36 which are closer to the
charge openings 33. At the lsame time the ribs
inlet I2 of the drum I0 are closerv to this plane
than are the discharge openings which are fur-L 35 33 will operate to rotate or tumble the objects or
ther removed.
parts thus further increasing the'speed of the
Secured to or formed in the inner surface of the
cylindrical wall of the drum I_Il_ are a plurality oi
circumferentlally spaced tumbler ribs V36, the
l L
drying process.’
It will be understood that the drying gas and
air after having been blown over the wet parts
function of which is to increase the extent >oi 40 will become heavily laden with moisture and, this
being the case, this iluid is then allowed to 'es- l
the drier as will bel understood. To assist the ' cape out both- ends of the drying drum. . How.
turning movement of the parts passing through
drum in discharging the parts theribs'. are prefer
ably omitted in the last space convolution ad
jacent the discharge end I3 of the drum.
Supported on top> of the frame provided by the
ever. it is obvious that a substantial amount of,
heat will be imparted to the drum, particularly
by reason oi the character of construction of the . `
. drum, and in accordance with the present inven
members 21-26 is a combustion chamber‘or re
tion this heat is reclaimed by exhausting the air
tort 40 preferablyk having a sheet metal shell
and a refractory lining 4I. A burner 42 is posi-`
from the space immediately surrounding the
mixer 43, the details of which are unimportant
in the present invention. Gaseous fuel is ‘sup
plied to the mixer and burner through the conduit
will be noted that the sidewall of the drum I6 is
impervious to the ilow oi gas or air so that none
drum into the blower 46. This is the function
tioned in the retort 40 at one end thereof and con 50 of the conduit 66 and the recuperation is further
enhanced by the insulation provided at'36. vIt
necting with the burner is a gas-air aspirator
44 by a valve 46 therein which may be either man
ually or automatically controlled and primary air
for combustion is furnished by conduit 46 having a
-valve 41 therein `'which may likewise be either
' manually or automatically controlled.
' Drying air aswell as primary -air for combus
tion is furnished by a blower 48 driven by the
motor 49 which are also mounted on top of the
o! the moisture laden iluid is drawn into the
Air is taken into the space between
the drum III and wall 33 through the necessary
clearances between the drum and the end walls
32. Thus the air is caused to move -in wiping
contact with the outer surface o! the drum Ill
55 blower 46.
00 thereby insuring maximum heat transfer. .
As stated above. the apparatus ot the inven
tion is particularly suited to be connected dl
rectly and mechanically with handling and/or
burner end of the combustion chamber 4_0. It
drums of other equipment whereby the
will be observed that at the end of the chamber 65 processing ofthe small parts may proceed in a
4II _opposite the burner 42.,there is provided av
continuous manner and with a minimum of batch
Venturi outlet 66 which is connected with the
handling. For this_purpose the drum I6 is lo
pipe 36 through the conduit 6I. Connected with
cated fairly close to the iloor level and thecharg
the outlet of the blower 46, and extending into
end I2 is provided with a flange 61 which may
the combustion chamber 46 is a conduit 62 which 70
be bolted to a similar flange of the end drum oi' a
is provided with an end nozzle 63 positioned sub
preceeding piece ofequipment as will be under
stantially in the throat of the outlet 60. It should
, frame provided by the members 21--26 at the
also be observed that the conduit 46 supplying
' primary air for combustion is supplied from the
stood...A When the drum III is so connected by the .
nange 61 the supporting cradle I6 may rock one
conduit 62. lSecondary air _for combustion and 75 way or the other thus avoiding the necessity ot .
aligning the base 24, 25 accurately with respect
to the base or frame of the preceding piece of
It should now be apparent that I have provided
an improved unitary, portable, self-contained
small parts drier which accomplishes the objects
initially set out. The apparatus is compact,
tion, a flange connected to and extending radially
outward of the outer end of said tapered portion
and adapted to be rigidly and mechanically c'on-`
nected to a rotating part of an adjoining appa
ratus whereby material to be dried may be charged
' directly into said drum from said last mentioned
apparatus, means in said drum to move the ma
readily constructed, and highly eillcient in oper
ation. The complete apparatus is light in weight
and may readily be moved about on the skids 24,
the only installation required being the provision
blower supported on said uprights, and means
comprising said blower to move heated air from
of a gas connection and an electric current con
said air heating means into said drum. I
teriai iongitudinauy through said drum, air
heating means supported on said vuprights, a
nection. Skids 24 and structural members 25, 26,
2. Apparatus of the character described com
21, 28 and 28 constitute a portable frame en
prising in combination a portable frame having
abling the complete apparatus to be moved about 15 a base and uprights on said base, a, horizontally
4as a unit.
disposed drying drum rotatably mounted in said
rBy reason of the high 'temperature maintained
~ in the retort or combustion chamber 40 the fuel
frame for rotation about an axis extending in
‘ termediate said uprights, means in said drum to
consumed is much more eñìciently utilized since
move the material being dried longitudinally
complete combustion is effected. This is brought 20 ’through said drum, said drum having .a centrally
about by furnishing an excess ofv secondary air
open material charging end, air heating means
through the valves 53' and, of course, any unused
supported on l said uprights, a blower sup
portion of the air as well as the hot gaseous prod
~ ‘ported on said uprights, anfair distributing duct .
ucts of combustion is utilized as drying fluid in the
extending centrally in said drum from the dis- .
drum it. A substantial part of the heat gen l25 charge end thereof, and means comprising said
erated is reclaimed by conduction through the
blower and duct to move heated air from said
wall of the drum and absorption in the air which
air heating means into said drum.
is drawn into the' casing 33-34, passed through `
3. Portable drying apparatus having .a box-like
the blower, and delivered to the drying'chamber ' frame, a tubular insulating shell mounted in said
through the conduits 52 and 36. The helix .Il 30 frame, a rotary drying drum having a material
aids in the conduction of the heat to the cylindri
moving helix therein and rotatably mounted on
cal shell of the drum I0.
said frame for rotation about an axis substan
While the use of above described burner and
tially coincident with the longitudinal axis of said
combustion chamber is the preferred method of `
shell, said drum projecting outwardly from either '
providing the necessary heat for the drying ap 35 end of said shell, a combus-tion chamber having
paratus of the invention, it should be understood n a fluid fuel burner therein mounted on said frame
that other suitable methods may be resorted to.
above the discharge end of said drum andhaving
For example, electric resistance heating elements
a portion overhanging _the discharge end of said
or steam coils enclosed in a suitable housing or
chamber may be provided for this purpose.
drum, a motor driven blower mounted on said
40 frame above th'e opposite end portion of said'
The above specifically described embodiment oi
drum> and having an inlet conduit communicat
the invention should therefore be taken as illus
ing with. the space intermediate said drum and
trative only as obviously many changes may be
shell, the bottom wall'of the overhanging portion
made therein without departing from the spirit
of---said combustion chamber having a `Venturi
or scope of the invention.. Reference should 45 opening therein, a conduit connected with the
therefore be had to the appended claims in 'de
outlet of said blower and projecting through a , '
termining the scope and extent of the invention.
wall of said combustion chamber to a discharging
What I claim is:
position in said Venturi opening, a distributing
1. .Apparatus of the character described com
tube projecting into the said discharge end ,of
prising a portable frame having a base and up
said drum, and a short curved tube interconnect
rights on said base, a horizontally disposed drying
ingsaid Venturi opening and said ydistributing
drum rotatably mounted in said frame for rota
tion about an axis extending intermediate said
uprights, said drum having a tapered end p_or
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