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Патент USA US2122970

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July 5, 1938.
Filed sept. 1e, 1955
1615 5 -'
y ifm@
Patented July 5, 1938
John W. Anderson, Gary, Ind., assigner to Pro
ductive Inventions, Inc., Gary, Ind., a corpo
ration of Indiana
Application September 16, 1935, Serial No. 40,791
6 Claims.
My invention relates to what may be desig
nated as defrosting devices, and particularly to
a device adapted for mounting on the inner side .
or adjacent the windshield of a motor Vehicle or
5 the like for heating or defrosting or preventing
the formation and accumulation of ice, snow and
sleet on theV windshield, thereby maintaining vis`
lFig. 2 is a sectional View taken substantially
on line 2-2 of Fig. 1;
Fig. 3 is a sectional View taken substantially
on the line 3-3 of Fig. 1; and
Fig. 4 is a sectional view similar to Fig. 2 illus
trating a variation in construction.
Referring to the drawing which represents gen
erally a casing or container consisting of a back
The invention has among its general objects
10 the production of a device of the kind described
which is simple, compact, attractive, durable,
eiîicient, readily attachable or removable and in
expensive to operate, applicable for motor ve
wall 2, bottom 3, ends 4, top 6 and front cover
wall 1, which last mentioned wall is preferably 10
attached to the other walls forming the con
The container itself with the exception
of the front wall may be made of any suitable
hicles of all kinds including automobiles, boats,
material, generally metal and formed in one piece,
aeroplanes, railroad trains, street cars, or where
eVer the same may be found desirable.
,More particularly, one of the objects of the
invention is the production of a device of the
while the front wall or cover 1 is preferably made
of metal such as copper, aluminum or the like,
which is a good heat conductor and which will
character described having high heat efficiency
which may be readily and easily mounted adja
container to the glass windshield or the like.
In the container shown in Figs. 1, 2 and 3, the
bottom, top andrend walls are provided with a
- cent the face of `the member to be defrosted or
maintained clear.
readily transmit the heat generated within the
flange 8 extending about the periphery thereof
Another object of the invention is to provide a
and the front wall or cover 1 is ñanged there
mounting means for the device which may be
over as indicated at 9 so that the casing or con
25 quickly connected to and disconnected therefrom
tainer when completed is substantially a sealed
unitary structure. It is immaterial whether the
it iirmly in place whereby chattering is prevented
container wall or cover is flanged over. The
cover or wall 1, however, may be made so that
it may be displaced for reñlling purposes as will
and which will act to yieldingly urge the device
against the windshield or the like and maintain
and the same is not 4subject to accidental dis
3 O placement.
be more fully >explained hereinafter. Obviously, o
Another object of the invention is to provide
an efficient >device wherein is contained a mixture
for producing heat by chemical action upon the
application of water or any other suitable liquid
re-agent, and wherein the water or agent may be.
o conveniently and satisfactorily deposited in the
device and be substantially uniformly dis
tributed throughout the mixture. ,
A further object of the invention is to pro
vide a structure wherein‘the heat produced by
the device may be concentrated or directed toward
and on a windshield glass or the like upon which
it is immaterial as to which wall is displaceable.
As most clearly shown in Figs. 2 and 3, the top
wall 6 is formed with a slot l0 therein with the
edges about the periphery turned inwardly as
indicated at Il and I2 so as to form a funnel
directed inwardly of the container. It is pre
ferred to have the slot extend substantially from
end to end of the container and the same may
be comparatively narrow in width as shown.
Within the container is arranged a chemical in „
the form of a suitable material or mixture in ^
which there will be set upa chemical action when
water or other suitable liquid is added thereto
An additional object is the production of a causing the generation of heat. It is unnecessary
container of the kind described which‘is readily to describe the chemical in detail other than to
adapted to provide for the insertion of re-fills of say that it is such that when the liquid is added,
chemical and removal of the exhausted chemicals it changes from a substantially inert mixture and
becomes active, generating heat over an inter
should it be desired to refill the same.
val of time. Also it should be such a chemical
Other objects and advantages of the construc
mixture that is without offensive odor, and after
for will be obvious tothose skilled in the art from it ceases to generate heat, it will again be active
upon the addition of more liquid. The chemical
the disclosures herein given.
Referring' to the drawing, in which only two mixture or heat generating composition and the
activity and life of the same is dependent upon
embodiments are shown for illustrative purposes:
the kind and amount of material used in the con- ,
, Fig. 1 is a rear elevation of the device;
the device is to be used.
tainer as well as the amount of water or other
liquid added thereto». I have found that a com
position suitable for the purpose is disclosed in
United States Letters Patent Nos. 1,488,656,
1,613,120 and 1,910,874.
It is preferred to place the heat generating
composition in an envelope I6 which is prefer
ably made of a fabric of the desired weight,
weave or thickness which may be made in the
10 form of a bag so as to entirely enclose the 'chem
ably yieldable or resilient so that when they are
positioned and the device mounted on the inner
side of the glass they exert a pressure, maintain
ing the face of the front or cover wall 'l snugly
and firmly against the glass so that there is very 5
little, if any, air between the device and the glass
which would reduce the efliciency. Likewise, by
maintaining it ñrm against the glass at all times,
the device will not chatter on the glass.
I have shown the back wall 2, as well as the
` ybottom wall of the container, provided with open
The envelope I6 is shown as stitched to
gether at the ends at I6’ and formed at the top
with the inwardly turned edges I1, either formed;
integrally with the body of the envelope or, as
15 shown, of separate pieces. It will‘be Vnoted by
referring to Fig. 3 that the envelope is provided
with a trough I1 formed by the inturned edges
which are disposed directly below the slot I0 in .
ings which may be arranged in the form of
VVlouvers 26 which- admit some air to the container
andu which with the particular chemical men
-tioned, tends to- improve the action of the chem
ical. ` Where the insulation I9 is provided in the
casing, openings I9' are arranged at the louver
20 for example water, is placed in the trough or
In the construction shown in Fig. 4, the device
is similar in its essentials to that previously de
funnel in theîtop of the container, will drain
scribed, but is varied to some extent> in details.
the top of the container, so that as the liquid, as
through into the trough I8 formed in the en
Referring to the iigure', 21 represents the case or
velope and thence permeate through the fabric
container which may-be 4provided` with the vac
uum cups 2l with the resilient arms 22 secured at
and then seep intoi the material, setting up the
25 chemical action. )After the water is added the
24 to the vacuum cups and arranged to engage in
device is thoroughly shaken so asY to agitate the
material. Obviously, the` cover 'l may be dis
theclips 2,3. With-this construction the funnel
shaped slot in the container at the top is omitted
placed and the envelope removed for the purpose
of adding the water` and the envelope shaken to
30 agitate the material, after which itV may be put
vided with louvers 28 on the back face and also on
in the container and the same closed. Y
In order to conserve the heat and prevent use
less dissipation through the back wall 2 of the
container as well as the bottom 3 and ends 4, I
35 prefer to insert a lining I9 of insulating mate
rial, as for example, asbestos, which may be
pressed into the container, >It will be particularly
noted, however, that the insulating lining is
omitted between the envelope and the front side
and louvers 29 provided. The same may be pro
the bottom if desired.A The front wall or cover 30 -
is arranged to be displaceable so as to permit
ready access to Vthe container, within which is ar
ranged an envelope 3l carrying the chemical mix
ture 32, it being immaterial as to which wall is
made‘displaceable. If other than the front wall
is displaoeable, the envelope may be removed
without removing the container from the glass.
In this particular form, the envelope 3l is pro
vided with a pocket or ñapmember 33 so arranged
as to provide a pocket or receptacle 34 in which
40 1 of the container so that the `wall l receives all
of the heat to conduct it to the windshield glass. ' theywater may be -placed and from whence it
In making up» the device, one of the flanges 9, seeps into the envelope and is taken up by the
as indicated at 9’ inFig. 2, on the wall 'l may be chemical. -Afterthewater has seeped in to the
left’unbent so that after the envelope is placed in interior of the envelope, the envelope is then
shaken thoroughly so as' to agitate the material
45 the container the wall l may be pushed into clos
ing position, as shown in Fig. 2,- and. then the and cause a more perfect chemical action ex
flange portion 9’ turned down, sealing the device
andV preventingV the tampering with the envelope
and contents. However, if itis desired to provide
50 reñlls for the container, whichthe user may pur
chase separately ,and insert in the container,` then
in that event the flange-9" may be omitted and
access be had to the container by merely sliding
the front wall or cover 'l> back and removing the
55 old envelope and inserting a-filled new one. By
making the cover or wall 1 displaceable, it is
also possible to remove the` envelopefand shake
that to agitate the material, thereby morey thor
oughly agitating it.
1‘ Y
I have shown means for securing the container
and contents to the inner side of the windshield,
the same consisting of suction or vacuum cups
2l, preferably made of rubber and suitably vse
cured to the container, preferably at the ends.
65 These cups are ‘each attached to spring >arms 22
by means of a rivet 24 or the equivalent, and in
the preferred constructionV I so connect the arms
to the container bythe vclips 23 Vthat they may be
>removed if desired. ' One ofthe advantages in
having the-same re‘n‘io‘vable is that when the de~
vice is removed from the windshieldI they may
bere'm'ovedjfrom the container when the device
is placed in the dash-‘or door pockets orcom
partments», making the' device a little-more con
75 venient and conipactwV The arms 22 »are prefer
tending throughout the length of the envelope.
In this form ofthe device I have omitted the in
sulation described as applicable for the other de
vice, but obviously it may be employed herein if
The body of the container may be 'made of any
material suitable for the purpose, but the front or
heat conducting .wall is preferably made of a ma
terial. that will readily transmit the heat to the 55
glass‘or body to beheated. It is obvious that
while the louvers ini-prove‘ï> the appearance, un
louvered openings'’may`~ be provided and in in
stances even>`v the openings might be omitted.
V'I'he devices are preferably `made more or less 60
compact and preferably somewhat elongated so
as to better distribute the heat to the glass as
well as to a very large extent avoid interference
with the vision;y Generally, it is mounted just at
therear and slightly below the wiper blade, which y '
is on the exterior side-- of the glass.
i `In» tests Íthe device is found efficient and may
be economically manufactured and is inexpen«
sive to use. A device of this kind relieves all
drain` on the‘batteryzof- the vehicle. It may be
instantly applied or removed without tools, does
not retard nor interfere With windshield wiper
action",` does not and cannot injure or cause dis
coloration of the Windshield nor expose the car
finish to .chemical reactions.
It `may be used
wherever found applicable, but is particularly
designed to be applied to windshields, windows
shield, an envelope in- said container, said en
and the like on motor vehicles or carriers par
velope having a trough-like edge portion adapted
to receive said lip portions, and a heat producing
ticularly including aeroplanes, motor boats, rail
“composition” in said envelope.
way cab windows, as well as passenger automo
4. A defroster comprising a container having
an elongated aperture formed in its upper side
biles, trucks and other vehicles.
It may be mentioned that the vacuum cups 2|
which are employed to secure the device to the
Windshield being preferably of rubber serve as an
10 insulation .between the resilient armsy 22 and the
glass of the windshield, so that the heat is not
dissipated from the glass into the arms. The
only metal contact of the device with the glass is
through the front wall of the container which
15 is the desired arrangement.
Having thus described my invention, it is ob
vious that various immaterial modifications may
be made in the same without departing from
the spirit of my invention; hence, I do not wish
20 to be understood as limiting myself to the exact
form, construction, arrangement and combina
tion of parts herein shown and described or uses
What I claim as new and desire to secure by
25 Letters Patent is:
1. A defroster comprising a container having
an elongated aperture formed in its upper side,
means carried by said container for attaching
the container to a Windshield, an envelope in
30 said container adjacent and operatively related
and having inwardly extending lip portions sur
rounding said aperture, means carried by said
container for attaching the container to a wind
shield, an envelope in said container, said en
velope having a trough-like edge portion adapted
to receive said lip portions, a heat producing
“composition” in said envelope, and a heat re
sisting liner inside said container and surround
ing a substantial portion of said envelope.
5. A deiroster comprising a container having
an aperture formed in its upper side, a plurality
of inwardly extending lip portions surrounding
said aperture, resilient arms mounted on said
container, suction cups- mounted on said arms for 20
securing the container to a windshield, a fabric
envelope in said container, said envelope having
a trough-like edge portion adapted to receive
said lip portions, a heat repelling liner in said
container and surrounding a substantial portion 25
of said envelope, and a mixture for producing
heat by chemical action with water positioned in
said envelope.
6. A defroster comprising a container having a
removable side portion and having an elongated 30
to said aperture, and a heat producing “composi ' aperture formed in its upper side, a plurality of
inwardly extending lip portions surrounding said
tion” in said envelope.
2. A defroster comprising a container having aperture, resilient arms removably mounted on
an elongated aperture formed in its upper side, said container, suction cups mounted on said
35 means carried by said container for attaching arms for securing the container to a windshield, 35
the container to a windshield, an envelope in said a fabric envelope in said container, said envelope
container, said envelope having a trough-like having a trough-like edge portion extending be- `
edge portion adjacent said aperture, and a heat . yond the respective ends: of said aperture and
adapted to receive said lip portions, an insulat
producing “composition” in said envelope.
3. A defroster comprising a container having
an elongated aperture formed in its upper side
and having inwardly extending lip portions sur
rounding said aperture, means carried by said
container for attaching the container to a wind
ing liner in said container surrounding a sub 40
stantial portion of said envelope and a mixture
for producing heat by chemical action with Wa
ter positioned in said envelope.
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