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Патент USA US2411039

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Nòv. l1.2, 1946.
R. v. HEusER
41,1%/ u. #fz/sri,
Nov. l2, 1946.
R. v. Hl-:usER
» Filed Oct. 12, 1943
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4 Sheets-Sheet 2
Nov. l2, 1946.
R. v.-HEUsER
4 Sheets-Sheet 3
Filed oct. 12. 1943
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Nov. EZ, w45.
à. v. HEUsER
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Filed OC‘L. 12, 1943
4 Sheets-Sheet 4
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Patented Nov. 12, 1.946
'- , 2,411,039`
`nEsIc- -Í
Ralph V. Heuser, WeavervillavN. C.
Application october 12, 1943, serial'No. 505,931 ~
_ ¿1 claims.
The present invention relates to apparatus for
be lubricated and it operateswithout’any atten
. drying and desiccating materials with the aid of
porous compositions capable of being desorbed or
tion. It is an improvement over the drying device
described in my U. S. Patent 2,067,920 which is
.non-automatic in‘operationïand requires a per
ity in homes, laboratories,` hospitals, restaurants
5 son’s attention in several manipulations. `
- The present invention is based in part on the
activated by heat.
The invention will probably be of greatest util
and certain stores or work shops where an actual
or potential need` exists for a compact, self-con
followingl principle: Bodiesof adsorbent compo
crackers, cookies, cereals, etc., once their con-`
4 current passing-through a system> of resistance
sition, preferably in the` form of a molded plate
tained drying device permitting small objects to
(or a multiplicity of plates), take up the _moisture
be rapidly dried and maintained at alow degree 10 liberated from the materials to be dried. The,
of relative humidity.
resultant gain in weight by the plate is instru
In homes the apparatus wil1 be useful 'for stor
mental in causing an electric circuit to be closed
ing and preserving various food products such as
by a sensitive electricswitch, the ensuing electric
tain'er has‘been opened, Vin a crisp and fresh con 15 wires embedded within ,the plate or in close prox
dition, hence preventing the same from becoming
imity thereof for purposes ofremoving the ad
soggy and’ unpalatable. It will also prevent the
sorbed .water from the plate. When this is the
- caking of powdered and granulated products such
case a >bimetallic strip opens the electrics'witch,
as sugar, flour, salt and spices. Furthermore it _ the plate cools down and -is again in condition to
will overcome certain diiliculties connected with 20 adsor-b nioisture. The plate fulfills, therefore, the
the dehydration of vegetables in ovens bythe hot
kdual role of functioning as an adsorbing lmedium
air- drying process. Some of the dried vegetables
and as an. organ of the control ymechanism of
. which it forms a part. This mechanismis pro
are very hygroscopic, hence in order to prevent
them from reabsorbing moisture and becomein
duced in the form of a balance, the plate being
fected and deteriorated by molds, spores or patho
_counterpoised by a' movable weight, by a cantilever
genic micro-organisms it has been the practice to
spring o_r by a helical spring.
put the dried products in hermetically sealed con
From' the above it is seen that the apparatus
tainers. By use> of ,the present drying apparatus
works in a cyclic manner. The onset of the de
sorbing phase is made adjustable by changing the
this inconvenience and expense can be avoided.
In laboratories the automatic drying apparatus 30 moment created by the counterpoise. This is done
would supplant or 'supplement conventional desic
by changing either the distance of the weight»
cators usually charged with sticky, deliquescent or
from the fulcrurn, or by changing the leverage
corrosive chemicals for absorbing waterfvapor.
of the cantilever spring or the stiiïness of the
The troubleand expense of replacing suchk chemi
helical spring. Furthermore provision is also
' cals would be eliminated. Besides a more rapid 35 made for regulating the period during which the
drying would be had as compared with desiccators
electric current is caused to ñow through the
. operating at maximum efficiency only when fresh- -
heating system.
ly charged. '
y The invention will be more readily understood
In hospitals and first-aid stations the appara
by reference to the accompanying drawings, `in
, tus would beadvantageous for storing and main
40“ which like reference characters indicate'like parts.
taining sterilized dressings, sutures, bandages as
well as surgical instruments, Petridishes, etc., in `
In ythese drawings
an aseptic' condition after sterilization, since very
dry hair has a strongly inhibitory leffect, on the
alongthe line I-I of Fig. 2, n
Fig. >1 is a vertical cross sectional view taken
growth and propagation of bacteria' and other 45fthe line 2.-2 of Fig.' l,
dangerous organisms.
Fig. 2 is a vertical transverse section taken along
Fig. 3\ is a cross sectional underside view taken
The few aforementioned uses are merely illus- « ¿along the line 3-3 of Fig. 2„
trative of numerous applications in which an in
Fig. 4 is a perspective view of the plate and
expensive, reliable drying apparatus is needed.`
accessory parts shown inv Fig. 1, 2, 3,"
`_ One of the principal objects of the inventionis,l 50 Figßâ, Fig. `6 and Fig. 7 depict I_three positions
therefore, `to provide an inexpensive, reliable andl ` of the link mechanism at different stages of the
eñlcient apparatus for drying and desiccatingma
`*drying operation,
terials- in the vabove' `mentioned relationships. `
Fig. 8 is a longitudinal view of an adsorbant
Other objectsV of the invention will be apparent ‘ plate A'with gravitational control mechanism,
from the following description thereof. l ’
55’Í Fig. 9 is a perspective view of the lever shown
The present drying apparatus 'is simple in de
sign, noiseless inoperation andv does not give rise
Fig. 10 is a front'eleva'tion vand Fig. 11 va plan
to radio disturbances. `It has no moving elements L view of four depending plates coupled together '
subject yto’ wear> nor `intricate Aparts .likely to get
and a ' control mechanism based on the use ofk a
out of order.- Furthermore it‘does not'require to
6c helical spring.
.The apparatus according to lthis invention con
sists essentially, as shown in Fig. 1 of a container
I subdivided .into two compartments 3 and 4 by' '
a horizontal partition 2. The lower compartment
3 servesasv a receptacle for the materials to 'be
dried, and these may be introduced and with
drawn through a hinged door 5, around the rim
‘of which is iitted a resilient gasket 6. Doory 5
20 in a fixed position and thus insure the partial
weight of the plate to exert its action on the spring
25 always at the same point once the proper ad- -
justment has meen made. For this purpose the
cups 23 secured'to angle 24 can «be moved in the
axis of the plate towards or away from the fiat
spring 25, by/ causing the ‘angle 24 to slide on
brackets 2,6/in and out upon turning the screws
21 which are provided with locknuts 28. 'I'he plate
' also`~is provided with a bolt and latch (not shown
in the drawing) permitting the door to be closed u 10 is supported at the opposite end of its length by the
blade 25, of suitable resiliency, via a curved metal
tightly. Partition 2 is designed as a narrow shelf
- strip 29 secured centrally to the underside of plate
within the container I to accommodate a two
wingedvdoor 1 capable of being tilted about pivots
8 in one direction only, as clearly indicated in the
to a base fixed on the wall I, of the container. .
The spring 251s attached at its other end
drawings. 'I'he top of the container I is provided 15 On the said base is also fastened the bracket 30.
When'the spring blade 25 is mounted on the base
' with a similar door 9 which, for the sake of brevity
will hereinafter be designated as “upper' door”
- as distinguished from door 1 hereinafter referred
‘ it has sufficient upward tilt that it will assume a
-substantially horizontal position 'upon being 'g
weighted down by the plate 20 after installation
`pivots` I0 but `only in thel direction opposite to 20 of the same. The distance of the center of the
to as'v “lower door”. Upper door 9' is tiltable onl
that of the'lower door_1. These two doors are
suitably linked together in such manner that when
one is open to the fullest extent possible the other
plate 20 from cups 23 advantageously is greater
than the distance to where the strip 29 touches
plate during the desorption phase from passing
into the lower compartment 3 provision is made
bell crank 32. One armfof bell crank 32 touches
the underside of blade 25 while the other arm
for the sudden closing of the lower door 1 as s_oon v
bears a setscrew 33, .positioned opposite a bime
the spring 25,
As shown in Fig'. 2, the bracket 30 supports one
is closedtight and .Vice-versa.
~ In 'order to prevent moisture liberated from the 25 end of a light shafting 3l on which is'secured
tallic strip 34. To shaft 3| is also rigidly secured ,
' action of a mechanism _which will be described 30 an arm 35 bearing a small permanent horse-shoe
as the upper door 9 has begun to open by the
later.A The titling movement of the lower doorv
1 yis made dependent upon the movement of the
upper door 9 through the intermediary of a
link IJ and a pawl I3. The link II consists of
tWo narrow strips of metal, and it is fastened to the
magnet 36. The slight downward deilection of
the spring'25 (brought about by moisture ad
sorption of plate 20) causes the magnet to ap
g proach the iron armature inside a Mercoid switch ’
31, mounted on the angle 38.
Another,Y somewhat sturdier bimetallic strip 38,
underside of the upper door 9 and I2 in a free
fastened to bracket 40, surmounts the plate 2li
swinging manner. The pawl I3 is suspended from
the lower- extremity of link I I and it swings freely " in a longitudinal direction. In its middle section
'strip 30 bears a heating element 4I consisting of
on pivot ’I4. At certain periods of the cycle the
pawl I3 engagés the latch I5 which is rigidly at 40 6 to 10 tunis of resistance wire wound around a
thin asbestos bobbin, the wiring also being insu
tached to the rupperside of the lower door 1. At
lated -by asbestos or glass iiber fabric on the out
another stage. of the operation pawl I3 will be
side in such a manner as not to interfere with
- seized through the intermediary of the projecting
the curling motion4 of .the bimetallic strip under
finger by' a` hook I1 support ed n a free-swinging
the influence of heat from the two sources.
Through a perforation near the‘free end of the
strip 39 a metal rod 43 projects a short distance
while its club shaped enlargement 42 rests on
top of the strip. The other end of rod 43 passes
culate -fr'eely between the two compartments 3 and“
4, as 'illustrated in Fig. 5. When subsequently 50 through agidef“ and at the extreme end of -rod
43 a cupy 45 is attached which holds a polished
Ithe upper door begins to open, as shown in Fig.
steel ball. The latter bears against a wing of
6, the linger I has been seized by the hook I1
the upper door 3, causing the ylatter to be opened
therebyfcausin .the curved end of pawl I3 to
when the electric> current passes throughthe ele
free itself i'rom latch l I5 and causing the lower
door 1 to suddenly fall shut in which position 55 ment 4I _and the plate 20. A counter-weight 46,
mannerat'point Iscr the bracket I9.‘ _
During’the absorbing- stage vof the plate .the
upper door 9 is closed and the lower door 1 re
mains ,cpen'w'hereby the air is enabled to cir
it then resides during the entire desorption stage „
of the plate. As. the upper door 9 opens wider
' at this time link I I -and pawl I3 will descend lower,
fastened to the inside of- one of the'wings of
door 9, serves as a means to insure the spontane
iinally slipping over the top of latch I5 and re»l .
ous closing of the door 9, when the rod’43 re
treats to its normal position related to the ad
engaging it-on its underside, lso that when the 60 sorbing stage of plate20. Counter-weight .46 isV
iixed o_n the wing opposite to that'which carries
upper _door begins to close it will carry with
it the lower door 1 and open it gradually. ' Dur
the-- link II and pawl I3.
ing itsupward travel the finger I6 of pawl I3
will clear .the hook I1 by pushing it slightly ,to
the'topy of container I serves as a. means to po
A rim 41 surrounding
is then again in positiongto trip the‘ pawl I3
when the'subsequent opening'of the upper door
` air readily to escape into the open when the door
sition a detachable hood 48 preferably made of
ward the~.wall of the container. `The hook I1 65 perforated metal so as to allow moisture-laden
.v `_
8 has opened.
The electric current- enters the
¿apparatus through socket l49, the circuit wiring
being diagrammatically indicated in Fig. 2.
compartment 4 also houses the .adsorbent
plate' 20 in_the interior 4of which is -embedded .70 As shown' in Fig. 8, which illustrates another
embodiment of the present invention as it con
a’gstretched coil’of electric resistance wire 2|. At
cerns- a modified form of the control mechanism,
one end -of its` length plate 20 is supported on two
the same manner of -positioning the plate 20 by
prongs 22, Fig. 2, by smallI cups 23 of glass or
prongs 22 and cups 23 is employed as in the
-metal.,_vWhile the prongs 22 are free to move
i 'aid cups 23, yet the prongs also hold the plate
75 previously described design; illustrated in Fig. 2,
2,4111,oa9 '
Fig. 3 and Fig. 4. In the present instance, how
ever, a metal disc 50 secured to the underside
' of plate 20 rests on the tip 5I of an upwardly
curved lever arm 55 (Fig. 9). A pin 52 secured
to a bracket 5_3 furnishes the fulcrum for the le
ver. -The other arm of the lever bears a sliding
weight 54 to oppose the force exerted by the
weight of the plate on the pointil of the short
lever arm. The pin 52 supports also in a free-‘
rocking manner a spider with amis 51, `58 and 59.
(Said spider is shown in the drawing infront of
the lever.) An oñset-finger 56 of the short lever
arm projects over the top of arm 51 and causes.
the latter to be turned downward when the weight `
and. is, therefore, the'preferred means to _serve
as an essential part of the construction of the
1fìllirying apparatus according to the present inven
When the apparatus is put in operation and the
electric current is beginning to flow through the
resistance wire in the plate and heating element
4 I , the bimetallic strip 39 -will curl upward, thereby ,
pushing the steel ball 45 on top of rod 43 against
one wing of the upper door 9 and causing the lat
ter to be opened gradually. The heating element
4I is used for the purpose to cause the upper door
9 to be opened more promptly than would be the
case if the bimetallic strip 39 received only the
of plate 20 increases due to moisture adsorption. 15 heat supplied through radiation from plate 20,
In consequence of this the small horse-shoe mag
net 36 attached> to the arm 58 of the spider will
approach the mercury switch 31, secured to brack
et 53, until the magnetic attraction of the soft
. this radiation beingy very small at ñrst.
door 8 has opened slightly the mechanism already
» previously described comes into play which causes
the lower door 1 to fall shut suddenly. Soon
iron armature inside the switch 31 is sufficiently 20 afterward watervapor will be evolved from the
strong to seize and hold the magnet. The heat
plate ln increasing volume as the plate gets hot
radiated from the underside of the plate 20 upon
ter. However the heat required for the evapora
the bimetallic strip 34 causes the latter to curve
'tion’of the water tends to check a rapid rise of
downward until it touches the setscrew on the
temperature of the plate until most of the water
arm 58 and `turns lthe spider backward so that 25 has evaporated when the temperature rises rap
the magnet 36 becomes detached from the switch
idly until finally the heat radiation upon the bi
31 which interrupts the electric current. At this
metallic strip 34 underneath the plate 20 becomes
Y juncture the lever as well as the spider are again
strong enough to deflect the strip 34 downward
at their original position.
to a sufficient degree to withdraw the magnet
The drawings Fig. 10 and Fig. l1 illustrate a 30 36 from the switch 31. During the desorbing
' third embodiment of the present invention. Four
phase which for a small-sized model ofthe ap
vertically suspended adsorbent plates> 20a, 20h,
paratus generally lasts ten to fifteen minutes, the
20c and' 20d, spacially separated, are rigidly
water vapor is rapidly carried. away by air convec
linked together in any suitable manner, as for
tion currents rising from the hot plate. The
example by means of rods 60 and porcelain spac 35 moist warm air travels upward along the under
ers 6l.
The projecting ends of the rods 60 are
engaged by links 62 andby means Aof these se
cured to a U-shaped frame 63 pivoted in a free
swinging manneron the, two pins 64. On the
opposite side of the frame a rod 65 with attach
ment 66 is usedfto support the middle part of thel
frameì by the intermediary of a helical spring on
the pivots of two bell-crank levers ¿1
-The heli~
cal spring consists of the two parts' 61 and 68.
By turning a knurleddisc 69 on the outside of
container I and therefore` also by turning the
threaded shaft 1| in one direction or other, ’the
two springs 61'and 68 can be tightened or re-'
laxed at will without disturbing the position of
attachment 66 and other parts of the control
When thus- making the sensitivity to defor
mation of the helical spring adjustable by chang
ing its stiffness (i. e. the tension under which it
operates) it- is obvious that a given weight incre
mentl acquired by the plate system 20a, 23h, 20c
and 20d'as a result of >water adsorption, can be
caused to either-advance or- retardthe closing of
theelectric circuit and> hence the> onset of' the
adsorbing phase.
Rod 65 is steadied in its upright position by be
ing `linked at its lower end by a pin'12 to a lever
13 capable of swinging on pin 14 which is firmly
>secured to a bracket `15. A sleeve 16 on pin 12
projects over the top of the arm 51 of a spider piv
oted on the pin 14. The -arm 59 of the spider
carries a setscrew facing the bimetallic strip 34
and the arm 58 supports a small horse-shoe mag
net 36 actuating the switch 31 mountedon the
bracket 15.
side of the partiallyopened door.
The action of '
air as a 'diluent prevents the water vapor from
condensing on the cold walls and other surfaces
of the upper compartment. An effective air circu
lation is set up by the' influx of cold air over the
top of the downwardly inclined wing of door 9
_into the interior. The inflow and outflow of the
air is therefore in counter-current motion, and as
a `result’of the rapidwithdrawal of heat by the
45 eliluent‘ vapor mixture the drying chamber 3 re
mains cool and the‘walls of the upper compart
ment 4 become only slightly warm.
When'the electric current- is automatically in
terrupted by the removal of the small horse-shoe
50 magnet from the Mercoid switch 31 the-air cir
culation is maintained for some time longer, while
the plate 20 is cooling. Because of the fact that
the return of the door 9 to its closed position pro
cee'ds -in thermostatic relationship with Vthe rate
55 of cooling of the plate 20, obviously the door 9
vcan never be in its “closed” position so long as the
plate »is still warm. This is important inasmuch
as this circumstance insures that the plate 20
recovers its adsorptive potency as rapidly as pos
60 sible. The same conditions prevail when a plu
rality of plates is employed, 'as shown ‘in Fig. 1l,
of a single
it isplate.
not necessary that the en
'tire number of plates be used together in the
5 balancing mechanism. Instead, only one plate,
but of the same size as the others may function
as a pilot plate for closing and opening the elec
tric circuit while the other plates are mounted
' stationary and connected in series to the pilot
70 plate. This arrangement will simplify the con
Needless to say a. flat coil spring could also be '
struction and provide a better utilization of the
used to operatefundera tension, varied at will for
space in plate compartment 4.
purposes of regulating the performance of the
The adsorbent plate 20 of the upper compart-4
apparatus. However the previously described use
ment> 4 never requires to be reconditioned in or‘
of the double helicalspring simplifies the design> 75 dinary service -since any volatile substance be
2,411,039 .
genized by passing through a shredder. In both
>i'cles water which may condense on its surface will
Llways be expelled from the plate during its re
tctivation in the desorbing phase. This is borne
)ut from trials with a model of the non-auto
natic type extending over several years when the
)lates had lost none of their initial drying power
md capacity.
-compositions the asbestos used Was a good grade
of chrysolyte, size “5M20.”.
The field of application for the drying appa
ratus determines the choice of the desiccating
agent used. Generally silica gel has a
broader range of adsorptivity, but a smaller dry'
ing intensity than Activated Alumina. The lat
To be suitable for use in the present drying
ter also has theadvantage of being effective at
ipparatus, the adsorbent plate must be highly ‘
-aorous in texture so as to enable the water vapor 10 somewhat higher temperature, as for example in
tropical countries. In certain applications where
:o readily penetrate to the interior of the plate.
[t also must be mechanically strong and durable
and not develop cracks duringthe rapid removal
if the water vapor in the heating operation. The
a particularly intense drying or desiccating ac
tion is required the use of soluble anhydride also
comes into consideration, notwithstanding its
comparatively high specific gravity and narrow
-»articles composing the platev must be ñrmly
range of effectiveness. In this case the drying
action is due to a chemical binding of the water
aonded together to prevent any loss of material
in continued operation and to make it possible
;o use the plate without any protective covering.
F‘inally the plate should have a high capacity
to form the hemi-hydrate of calcium. sulfate,
whereas in the case of the desiccants mentioned
previously the water is held by capillary con
as well as a high intensity for adsorbing water
vapor. These various requirements are fulñlled
densation‘in the'pores of these substances
by molding the plate Vfrom a three-component
What is claimed as new and useful is: _
1. A drying'apparatus comprising the combina
mixture comprising a desiccating agent, a fibrous
tion of a drying chamber adapted to receive ma
filler and a binding agent. In order to be Aable
to use a larger proportion of the desiccating 25 terials to be dried and an adsorbing chamber, said
chambers having a common wall,.a movable door
agent in the mixture than has been possible by
in the wall, a moisture adsorbing unit'and a.
using gypsum as a binding agent according to
heating element therefor within the adsorbing
chamber, means for movably supporting said ad
was extraordinarily suitable as a binding agent. 30 sorbing unit, and means actuated by said sup
U. S. Patent 2,067,920, further experimentation
led to the discovery that the mineral bentonite
porting means when a predetermined weight of
moisture has been adsorbed by said unit ‘to en
Not only was it found possible to use this binder
in appreciably smaller quantity, but its use in
ergize said heating element, a second door sep
the composition greatlyv facilitated the kneading
arating the adsorbing chamber from the _outer
and molding of the moist mixture into a homo
geneous, plastic mass from which surplus water 35 atmosphere to permit vapors liberated from the
adsorbing unit, upon application ofheat thereto
could be easily removed by compression in a spe
to escape into the outer atmosphere, thermostatic
cially designedv mold between liners of cloth or
means to open said second door and `simultane
the like, and applying' the pressure gradually
ously effect the closing of the door between the
with increased force. The good plasticity of the
chambers, said thermostatic means being heated
mass also made it possible to impress in it with
simultaneously with the energizing of the heat
out any effort a previously wound and evenly
ing element, and means for de-energizing said
spaced resistance wire coil into one half of the
heating element when a desired weight of water
plate before adding theremainder of the mass
has been removed Áfrom the adsorbing unit.
in such a manner as _to preclude formation of
2. A drying apparatus comprising the combina
air pockets and ñnally expressing the surplus
water from the composite slab in the mold. On
tion of a drying chamber adapted to receive ma
terials to be dried and an adsorbing chamber, A
said chambers having a common wall, a. movable
door in the wall, a moisture adsorbing unit with
a manufacturing scale it would probably be most ,
advantageous to produce the plates in half
thicknesses by extrusion. No claim is made, how
ever, for any particular method in producing the 50 in the adsorbing chamber comprising a plurality
of spaced moisture-adsorbing plates having elec
molded plates with embedded resistance wires.
trical resistance wires forming heating means
For experimental purposes plates of corru
embedded therein, means for movably supporting
gated cross-section were made with the over-all
said adsorbing unit, and means actuated by said
dimensions 6” x 3” x 1". the thinnest part of
the plate between the Íurrows being 1/2”. They 55 supporting means when a predetermined weight
of moisture has been adsorbed by said unit to en
contained embedded Nichrome resistance wire
ergize said resistance wires, a second door sep
coils wound on a 332" mandril, 16 ft. of 30 B. & S.
arating the adsorbing chamber from the outer
ga. “Chromel A” wire being used for operating
atmosphere, located approximately over the ad- '
on 110 volt. Satisfactory’plates could be made
ïrom commercial silica gel as well as Activated 66 sorbing unit whereby vapors liberated from the
adsorbing unit, upon application of 4heat thereto,
esscape by convection into the outer atmosphere,
Alumina. Typical -mixtures were as follows:
thermostatic means to open said second door and
(A) Silica gel--___'-__- __________________ __ 57
Asbestos _____________ _-.________ _;_____
simultaneously effect the closing of the door be
65 tween the chambers, said thermostatic means
Bentonite ___________________________ __ 14
comprising a bimetallic strip having an independ
Activated Alumina ___________ _; _____ __ 'l0
ent heating element in association therewith and
being energized simultaneously with the' energiz
ing of the resistance wires of the adsorbing unit
Asbestos ____________________________ __
Bentonite____._-_l ______________ _..-..___ 10
The silica gel used was of m1nus\ 100 mesh 70 and means for de-energizing said resistance w-ires
when a desired weight of water has been removed
particle size. The Activated Alumina was a minus
from the adsorbing unit.
300 mesh powder. Each of the above mixtures
3. A drying apparatus comprising the combina
was triturated and kneaded to a stiff dough with
tion of a. drying chamber, adapted to receive ma
approximately 50 parts of water per 100 parts of
the dry mixtures. The dough was'then4 homo 75 terials to be dried, an adsorbing chamber in close
. proximity thereto and in communication there
with, a movable door between the said'cham
' bers, a -movably supported moisture-adsorbing
unit, a counterbalancing means comprising an
tion of a drying chamber to receive materials to
be dried, an adsorbing chamber in close proximity
thereto, a moisture adsorbing unit in'said ad
sorbing chamber with heating means, a, movable
door between the drying chamber and the ad
lsorbing chamber, a second door separating the
adjustable spring adapted to hold said adsorb
ing unit in .aA predetermined position when freed
-from moisture yet allow said unit to move down
adsorbing chamber from the outer atmosphere,
means adapted to >instantaneously close the said
ward as it adsorbs moisture, the spring being
first door upon the incipient opening of the sec
adapted to restore the moisture adsorbing unit to
the position occupied by it before adsorption of 10 ond door thereby permitting vapors liberated
from the adsorbing unit to escape into the outer
water when adsorbed water is removed, heating
atmosphere, said second door being intercon
meals for said moisture adsorbing unit, means
to energize said heating means actuated by the
nected with the first door through the. instru
counterbalancing means upon the downward
mentality of a link supporting a pawl provided
movement of the _moisture adsorbing unit after 15 with a finger adapted to release a latch attached
adsorbing a desired amount of water, means to
to the ñrst door from the said pawl engaging it
when the finger of said pawl is seized during its
close the door between the adsorbing chamber
and the drying chamber and simultaneously open
downward travel by a. swinging hook pivoted on
the side of the adsorbing chamber, a, bi-metallic
from the outer atmosphere whereby the vapors 20 strip having an independent heating element in
liberated from the adsorbing unit, on application
association therewith, being energized simulta
of heat thereto, can escape into the outer atmos
neously with the energizing of the heating means
phere by convection, said door-operative means
for said .adsorbing unit, a link connecting thek bi
comprising a bimetallic strip having independent
metallic strip and said second door whereby said
heating means energized simultaneously with the 25 door is Lopened when the «bimetallic strip is bent
heating means for the heating means of said
upon being heated and means for de-energizing
adsorbing unit and means to .de-energize both
said heating means when a desired amount of
heating means when a desired amountrof water
moisture has been removed from said moisture
has been removed from said adsorbing unit.
adsorbing unit.
' a second door separating the adsorbing chamber
4. A drying apparatus comprising the combina 30
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