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Патент USA US2410362

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Oct. 29, .1946.
A. A. REISER
2,410,362
ELECTRICAL CONTACT HEATER
Filed Sept. 26, 1942
3 Sheets-Sheet}
AT TORNEYS
Oct. 29, 1946.
A_ A_ RE|$ER
2,410,362
ELECTRICAL‘ CONTACT HEATER
Filed Sept. 26,, 1942
s Sheets-Sheet 2 '7
FI'
l
—1———-———T
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‘9004 WOW
ATTORNEYS
Oct. 29, 1946.
2,410,362
' A. ‘A. REISER
‘ELECTRICAL CONTACT HEATER
Filed Sept. 26, 1942
' s Sheets-Sheet 5
I
Wv
1/
INVENTOR.
‘O
FJQ.
ATTORNEQ
Patented Oct. 29, 1946
‘ UNITED
2,410,362
STATES
PATENT I OFFICE
2,410,362
ELECTRICAL CONTACT HEATER
Alfred A. Reiser, Buffalo,- N. Y.', a'ssi'gnor, by ~
mesne assignments, to H; & -A. Manufacturing
(30.; Binghamton, N. Y., a partnership com
posed of Maurice Harowitch, Clarence H. Ack
ley, and Harold Horowitz
I
7
Application September 26, 1942, Serial No. 459,793
14 Claims. (01. 219-19)
1
2
_ This invention relates to an electrical contact
free operation of the gun or the discharge of
heater and more particularly to a contact heater
for maintaining ‘a minimum temperature of the
shells therefrom.
mechanism of machine guns or cannon, particu
larly when used in aircraft, to prevent the mech
anism of the gun or cannon from jamming under
the low vtemperatures encountered at higher
levels. The invention is no't,)however~, limited to
such an electrical contact heater which can be
‘
Another object of the invention is to provide
easily attached to the mechanism to be heated
and readily removed therefrom.
_
vAnother ‘object is to provide such an electrical
contact heater which is connected with the cover
of the chamber to be heated in such manner that
the cover can readily be lifted, together with the
this particular use and can be embodied in any
type of electrical contact heater where the fea
tures of the invention can be advantageously
employed.‘
contact heater, and readily replace the heater
thereby not interfering with the ready inspection
one of the di?iculties which has been en
countered in aerial combat work is that at the
or adjustment of the mechanism contained within
low temperatures encountered at higher atmos
pheric levels the mechanism of the machine guns
Another object of the invention is to provide
the chamber to be heated.
such a heater in which the heating elements are
se'ctionalized so that if one is rendered inoper
ative the balance will continue to function.
Another object is to provide such a contact
and cannon is' liable to freeze and hence render
the gun or cannon inoperative. Once the gun
?res its own heat'is su?icient to maintain it at
an operating temperature and the di?iculty is
encountered in maintaining. the temperature of
_
20 heater which is free from any danger of igniting
any surrounding gasc-lene fumes or the like.
Another object of the invention is to provide
such a contact heater which vis simple, inexpen
si'v‘e and light in construction; is low in cost of
the gun’ mechanism prior to the first burst of
?re. To solve this problem it has been the prac
tice to use hot air or the like to prevent the
temperature of the gun mechanism from drop
production and which will stand up under condi
ping below, for example, 0° F. Such an- heating
tions of severe and constant use Without getting
devices are, however, bulky and obstructive to
out of order or requiring repairs.
the ready operation of the gun or cannon.
In the accompanying drawings:
It is accordingly the principal object of the
Fig. _1 is a perspective view of an electrical con
present invention to supply an electrical contact 30 tact heater embodying my invention.
heat-er which will maintain the mechanism of a
2 is an enlarged side elevation thereof
machine gun at a minimum temperature which
and showing the same applied to a machine gun
prevents the parts from jamming and insures the
which is indicated by broken lines.
Fig. 3 is a top plan view thereof.
initial free operation of the gun. ‘
i h
v
‘Another object of the invention is to provide
such an' electrical contact heater which will
operate within the maximum wattage available
for this purpose, the electrical power plant of a
35
Fig. 4 is a vertical longitudinal section, taken
on line 4—>-4,~Fig. 3.
Fig. 5 is a vertical transverse section, taken
on'line 5--5,'Fig. 2. ,_
Fig. 6 is a vertical longitudinal section, taken
combat plane having limitations ‘in the amount
of current which can be withdrawn for gun 40 on line 6-6, Fig. 5. ‘
Fig‘. 7 is a vertical transverse section taken
heating purposes.
I
‘
on line 1-71, Fig. 6.
It is another object of the present invention
8 is'vavv fragmentary vertical section, taken
to provide such a contact heater which insures
w
the'niakimum amount of heat being transferred 45 on line 8——8,Fig. 2.’ v v
h
Fig.
9‘
is
a
diagrammatic
representation
of the
to‘ the‘ gun ‘mechanism which‘ must be kept at a
wiring systemv of theicon'tact heater.
‘
The electrical‘ contact heater is shown as
mounted on a machine‘gun A having side walls
to the surrounding atmosphere.
B and a removable cover C which is provided
Afibthér Object of the“ invention is to provide 50 withflanges ‘D ?tting over the side walls B and
such an" electrical contact heater the efficiency
enclosing a chamber
This chamber E'contains
or which will not be disturbed'yby the recoil of
the operating mechanism of the machine gun
the?’ gun or cannon on
it is mounted.
(not shown) which it is desirable to ‘maintain
minimum temperature and which avoids the‘ dis
sip'ation of heat tocthe'r parts of the gun‘ or
'Another‘aim is to provide such an electrical
at a minimumtemperature of, say,‘ O" F.'t'o pre
contact ‘heater which does not‘ interfere with'the 55 vent the oil-of these parts from congealing and
2,410,362
4
3
each heating pad is arranged a sheet 45 of di
electric material, such as mica, such material
B of the machine gun is shown as having an
also preferably having a relatively high rate of
exteriorly projecting bolt head F which inter
heat transfer. Against the outer face of this
feres with the planar form of the side walls B
of the gun and around which the heater em 5 sheet 45 is arranged the resistance wiring 4B.
This resistance wiring can be of any suitable
bodying the present invention is ?tted, as herein
form to impart the desired heat and is purely
after described.
diagrammatically shown as a wire extending back
The contact heater embodying the present in
and forth along the outer face of the sheet 45.
vention is shown as including a casing I0 made
This resistance wiring is shown as being backed
of sheet steel to have the necessary strength and
by several sheets 48 of non-electrical conducting
resilience and having a rectangular top II and
thereby render the gun inoperative. One wall
sides I2 and I3 which are bent downwardly from
and low thermal conductive material, such as
asbestos.
the longitudinal side edges of the top II. To ?t
the particular machine gun shown, the side wall
The resistance wiring and the mica
and asbestos sheets are then sealed in the cup
shaped shell 35 by a layer 49 of a synthetic resin
or other hard setting material which will not
I2 is recessed at one end, as indicated at I4, to
leave a stepped flange I5 projecting downwardly
melt at the temperatures developed by the resist
from the corresponding side edge of the top II at
ance wiring and which is poured into the cup
that end of the casing, and similarly the Opposite
shaped shell after it has been filled with the
side wall I3 is recessed at the corresponding end,
as indicated at IE, to leave a flange I8 projecting 20 mica and asbestos sheets and the resistance
wiring and permitted to harden. The rigid heat
downwardly from the opposite side edge of the
pads 35a, 35b and 350 are therefore of sealed
top II. Further, to ?t the particular machine
water-proof construction and the leads 5!) and
gun shown, the side wall I3 is centrally recessed,
5i for the resistance wiring 40 can be brought
as indicated at l9, so that this side wall can
out in any suitable manner.
be ?tted downwardly around the head of the bolt
The leads 50 and 5| from the resistance wiring
F which projects from the corresponding side
of the several rigid heating pads 35a, 35b and
wall B of the gun as previously described.
350 extend upwardly from these heating pads
One end of the top II is bent downwardly to
and are arranged along the underside of the top
provide 9. depending end flange 20 and the oppo
I I of the steel shell I0, as best shown in Figs. 3-7.
site end of this top is bent downwardly to provide
As best illustrated in Figs. 4 and 9, the leads 5!!
an opposite end flange 2|. The opposite ends of
are commoned and similarly the leads 5i are
the side wall I2 are bent inwardly to provide
interconnected, this being preferably accom
inwardly projecting end ?anges 22 and 23 and
plished by bars secured to the underside of a block
similarly the opposite ends of the side wall I3
5?. which is in turn secured to the underside of
are bent inwardly to provide inwardly projecting
the top II of the steel casing II], as best shown
end ?anges 24 and 25. The side wall l3 at the
in Figs. 3 and 4. These bars are respectively
generally vertical edges of the recess I9 is bent
connected to the opposite sides of a source of
to provide inwardly projecting ?anges 28 and
electrical energy 53 which is conventionally illus
29. The lower horizontal edges of the side walls
I2 and I3 are bent to provide downwardly and 40 trated as being a battery but which may be the
generator of the airplane. As best shown in
inwardly inclined ?anges 30 which fit against
Figs. 1 and 2, the lines connecting the heater
the lower edges of the corresponding vertical
with the source of electrical energy 53 are brought
?anges 22-29 and the lower extremities of these
out from the side of the casing III in the form
inclined lower ?anges are bent upwardly to pro
six L! of a cable 54. It will be noted that the several
vide lips 3|.
The flanges 22, 23 and 30 of the side wall I2 ‘
sets of resistance wiring 46 are connected in
form a pocket receiving a rigid heat pad 350..
parallel so that in the event that one should be
broken in combat, the remaining heating ele
The ?anges 24, 28 and 30 of the side wall I3
form a pocket for the reception of a rigid heating
ments will function to heat the gun.
An important feature of the invention resides
pad 35?), and the ?anges 25, 29 and 30 form a
in the manner of mounting the rigid heating
pocket for the reception of a rigid heating pad
pads 35a, 35b and 350 in place, it being highly
35c. As these pads 35a, 35b and 350 are iden
important that the broad walls 31 of these heat
tical, except as to size and shape, the following
ing pads ?t ?at against the side walls B of the
description of one applies to all three:
' gun casing to insure a high rate of heat transfer
Each of these rigid heating pads is shown as
and it also being important to leave an air space
housed within a shell 36 made of sheet copper
between these heating pads and the casing I0
or other metal having a high rate of heat trans
and to otherwise reduce, so far as possible, all
fer and as having one broad vertical wall 37 which
heat transfer from the heating pads to the steel
?ts ?at against the corresponding side wall 13
case II). It will be appreciated that the loss of
heat to the surrounding air reduces the heat
transmitted to the mechanism within the cham
ber E and hence reduces the e?iciency of the
of the machine gun and from the opposite gen
erally vertical edges of which ?anges 38 project
outwardly. Along its upper horizontal edge the
wall 31 of each of the pads is ?anged, as indi
cated at 39, this ?ange extendingr upwardly and
outwardly parallel with the ?ange 30 along the
heater as a whole.
To this end, as best illus
trated in Figs. 2 and 8, the lower inclined ?ange
40 of each of the heating pads 35a, 35b and 350
lower edge of the corresponding side wall of the
casing I0, and along its lower edge the wall 31
of each of the pads is ?anged as indicated at 40,
carries a pair of spaced pins 55 which can be
secured thereto in‘ any suitable manner and which
this ?ange projecting upwardly and outwardly
parallel with the opposite ?ange 39. The broad
vertical wall 31 is preferably provided with its
marginal ?anges 38—40 by stamping so that each
project outwardly into an opening 55 provided
in the corresponding lower inclined ?ange 30
of the steel shell ID. A spacing washer 51 can
be provided around each pin 55 and is shown
shell 38 is of cup-shaped form and free from
holes or soldering.
?ange 30 of the steel shell.
In the bottom of the cup-shaped shell‘ 36 of
as soldered to the inner face of the inclined
as
The pins 50 and
holes 56 are so located as to leave an air space
2,410,362;
5
58 between each heating pad and the correspond!
apart as indicated by the dot-dash lines in Fig.‘
ing side leg or wall I! or l3 0f the steel case l0.
7. ‘This permits the'unit to be placedv over the
At its upper end each of the heating pads 35a,
cover C of the machine gun, the unit thereby as‘
35b and 350 is held against a bracket 60.. As best
shown in Figs. 6 and '7, each of these brackets
comprises a vertical upper leg 6! which is ?tted
against the inside of the corresponding side wall
suming the dot-dash line position shown in Fig.
4. The unit is then pressed downwardly into the
full line position shown in Fig‘. 4,. the strip ‘H of
l2 or [3 of the steel casing and secured thereto
at its ‘upper end by a rivet 62‘ and at its lowerv
end by a bolt 63 having a nut 64 which bears
against the cover 0 of the machine gun against
the resistance of the pair' of helical compression
springs 15. .IT-he side walls 'or legs [2, i3‘ of'the
steel case are then‘ pressed together so that‘ the
lips 68 of the brackets 60 engage under the ‘side
?brous ‘ material
against the bracket 60. This‘ bracket 6'0 is also
formed to provide a lower leg 65 which projects
being
thereby
pressed
flat
downwardly and inwardly parallel with the bot
edges of the cover C of the machine gun. In
tom ?anges 30 0f the side walls ['2 0r I13 of the . so bringing in these side legs or walls of the steel
steel casing and hence parallel with the upper
casing the heating pads 35a, 35b and 350 adapt‘
and lower ?anges 39 and 40 of the corresponding
themselves to the side walls B of the machine
heating pad. The upper ?ange 39 of this corre
gun and ?t against them in direct planar rela
sponding heating pad ?ts against the under side
tion.
of this inclined leg 65 of the bracket 60 and- is
This position of the unit, illustrated ‘by full
held thereagainst by a leaf spring 66 which is se 20 lines in the drawings, is maintained by a pair of
cured to the inside of the corresponding side wall
U-shaped metal yokes 80 the central cross .part 8|
or leg l2, l3 of the steel shell, as best shown in
of which is journaled in a pair of ears'82 pro
Figs. 5-7 and presses inwardly against the upper
vided on the top H of the steel casing 10. Each
edge of the corresponding heating pad. Each of
of these yokes 80 is of heavy relatively rigid con
the brackets is also formed at its lower end to 25 struction and is provided with a pair of depend»
provide an inwardly projecting horizontal lip
i'ng arms 83 which embrace the opposite side walls
68 which is arranged to engage the underside of
or legs [2, I3 of the steel casing. Each of the
the corresponding edge of the cover C of the
machine gun as best shown in Fig. 7.
It will be seen that by this arrangement the air
arms 83 of these rigid yokes ?t into a notched
space 518 is left between each heating pad and
the adjacent portion of the steel shell I0 and
further that the connection between each heat
ing pad and this shell is such that there is a very
small heat transfer from the heating pad to the
steel shell. It will further be seen that each
heating pad is ?exibly secured to the steel shell
and is yieldingly urged inwardly by the leaf
spring 66 and that this ?exible connection ‘is such
as to permit bodily movement of the heating pad
inwardly and outwardly and also so as to permit
the heating pad to tilt about a vertical, horizontal
or inclined axis. Therefore, when the heater is
applied to the machine gun, each heating pad is I
free to‘ adapt itself and come into ?at planar con
tact with the side walls B of the machine gun,
this planar ?tting of each heating pad against
the machine gun insuring proper heat transfer.
It will further be seen that the brackets 60 which
secure the heating pads in place also serve to hold
the heater casing in place, inasmuch as these
brackets are provided with the lips 68 which ?t
under the cover C of the machine gun.
This cover Cof the machine gun is surrounded
by a layer 10 of hair felt or other suitableinsdlat
ing material which can be secured to the steel
casing in any suitable manner. As shown, that
is accomplished by a strip ‘H of any vsuitable
?brous material which ?ts against the top of the
cover C of the machine gun and is provided at
its opposite ends with upturned flanges 12 each
also acting through the leaf springs 66‘ against
the rigid heating pads 35a, 35b and 350 to hold
these pads ?rmly in true planar engagement with’
the sides B of the gun.
In installing the contact heater embodying the
invention upon a machine gun, the yokes as are‘
?rst swung so that their legs occupy an upright
position, this permitting the side walls or legs
I2, [3 of the steel shell 16 to spring to the dot
dash lines shown in Fig. 7. The heater is then
placed over the'machine gun A and the ?ber strip
‘H is pressed downwardly upon the cover C of the
machine gun against the resistance of the‘ helical
compression spring 15. The sides or legs l2, l3
of the casing are then pressed inwardly so as to.
bring the several heating pads 35a, 35b and 350
into contact with the side walls B of the gun.
The legs 83 of the yokes 80 are then swung down‘
wardl-y, and engaged with the notched lugs 84,.
In bringing the side, legs or walls l3 of the eas
i'ng together, the lips 68 "of the bracket 60‘ are
brought, under the lower edges of the cover 0
so as to lock the‘heater in position on the ma
chine gun. At the same time, since the mounting
of the heating pads 35a, 35b and 350 is such as
to permit these pads to turn in any direction, the
heating pads are free to adapt themselves‘to the‘
of which is secured to the inner side of the corre
sponding end ?ange 20, 2| of the top H .of the
steel casing ID by the endsv of a wire clip 13,: as
best shown in Figs. 3 and 4.
lug 84 which is suitably secured to the corre
sponding side wall ['2 or l3 of ‘the steelv casing
H]. The arms 83 of these yokes 80 are» not of
themselves springy but press against the side‘
walls or legs l2, l3 of the steel casing '30, these
side walls or legs of themselves being springy and
The strip ‘H of ‘
?brousmaterial is preferably urged into ?rm en
gagement with the’ cover C of the machine gun
byv a pair of helical compression springs 15-, as
best‘ shown in Figs. 3 and 4. This strip ‘ll of
?brous material can also be slotted or otherwise
perforated, as indicated at 16, Fig. 4, to receive
any projection 11 on the upper side of the cover
side walls B of the gun and to come into true
pl'anar'contac't therewith. This insures the max
imum heat transfer between the broad ?at'walls
31 of these heating pads and the sides B of'the
gun and hence insures the maximum heating of‘
the parts (not shown) contained within the
chamber E. At the same time, the air space 58.‘
is maintained between each heating pad and they
supporting shell IO'of the heater so that the loss
of heat to the outside atmosphere is reduced. '
From the foregoing it will be seen that the
present invention provides a very simple, inexy
In applying the unit to the machine gun A the
pensive and effective electric contact heater, par‘
legs? or sides I2, l3*of the steel‘shel'l can be spread 75 ticularly for maintaining a minimum temporal
C- of the machine gun.
_
,
'
'
2,410,362
7
8
thermal insulating air space between said heat
ing pad and said corresponding leg, a bracket
Secured to the inside of said corresponding leg
machine gun or removed therefrom; which does
adjacent the opposite margin of said pad, means
not interfere with the opening of the cover on
which it is mounted; which is so constructed as Cl loosely securing said opposite margin of said
heating paid to said bracket to permit said heat
to avoid the danger of igniting any gasolene
ing pad to adapt itself to the exterior surface of
fumes; which insures the maximum amount of
the part to be heated, and means yieldingly urg
heat being transferred to the part of the ma
ing said corresponding leg of said casing toward
chine gun to be heated with a minimum dissi
pation of heat; and which accomplishes the 10 said part to be heated and thereby hold said
heating pad in firm thermal contact with said
other objects of the invention as hereinbefore
surface.
stated.
ture of the operating mechanism of a machine
gun; which can readily be installed upon the
I claim as my invention:
1. An electrical contact heater of the character
described, comprising a U-shaped casing of re
silient material adapted to embrace the part to
be heated, a rigid electrical heating pad arranged
5. An electrical contact heater of the charac
ter described, comprising a U-shaped sheet metal
casing adapted to embrace the part to be heat
ed, the extremities of the downwardly project
ing legs of which are each provided with an in
wardly and downwardly projecting ?ange, a
inside of said casing and loosely secured to one
heating pad arranged within said casing adja
leg thereof to permit it to adapt itself to the
exterior surface of the part to be heated, and 20 cent each leg thereof and each comprising a
cup-shaped metal holder and electrical resist
means yieldingly urging said legs of said casing
ance wiring in said holder insulated therefrom,
toward each other to hold said heating pad in
the upper and lower parts of the rim of each
?rm thermal contact with said surface, compris
cup-shaped holder being inclined generally par
ing a U-shaped yoke having its cross part jour
allel with the ?ange of the corresponding leg,
naled on the cross part of said U-shaped casing
and having rigid legs adapted to engage retaining
means loosely securing the lower inclined part
of the rim of each holder to the flange of the
lugs provided on the exterior of the legs of said
corresponding leg and holding the heating pads
U-shaped casing.
in spaced relation to the legs of said casing to
2. An electrical contact heater of the character
described, comprising a U-shaped sheet metal 30 provide thermal insulating air spaces between
said heating pads and legs, a bracket secured to
casing adapted to embrace the part to be heated
each leg of said casing adjacent the upper part
the extremity of one of the legs of said casing
of the rim of each heating pad and having an in
being provided with an inturned ?ange, a rigid
clined lower end adapted to ?t against the in
electrical heating pad arranged within said cas
ing and loosely secured at one margin to said in- . clined upper part of the rim of the correspond
ing heating pad, spring means between each
turned ?ange and in spaced relation to the cor
heating pad and the corresponding leg of said
responding leg of said casing to provide a thermal
casing and yieldingly holding each heating pad
insulating air space between said heating pad
in engagement with the corresponding bracket,
and said corresponding leg, means for loosely se~
and means yieldingly urging said legs of said
curing the opposite margin of said heating pad
casing toward each other to hold said heating
to said corresponding leg to permit said heating
pads in ?rm thermal contact with the surface to
pad to adapt itself to the exterior surface of the
be heated.
part to be heated, and means yieldingly urging
6. An electrical contact heater for heating a
said corresponding leg of said casing toward said
part to be heated and thereby hold said heating : part having a cover provided with downturned
?anges embracing said part, comprising a U
pad in ?rm thermal contact with said surface.
shaped sheet metal casing having its cross part ar
3. An electrical contact heater of the character
ranged over said cover and having depending
described, comprising a U-shaped sheet metal
side legs embracing the sides of the part to be
casing adapted to embrace the part to be heated
heated, a rigid electrical heating pad loosely se
the extremity of one of the legs of said casing
cured at its lower end to the lower extremity
being provided with an inturned ?ange, a rigid
of each of the legs of said casing and spaced
electrical heating pad arranged within said cas
from the correspondingleg of said casing to
ing, a pin loosely connecting one margin of said
provide a thermal insulating air space between
heating pad with said inturned ?ange and hold
each heating pad and the corresponding leg of
ing said heating pad in spaced relation to the
said casing, a bracket secured to the inside of
corresponding leg of said casing. to provide a
each leg of said casing adjacent the upper end
thermal insulating air space between said heat
of the corresponding heating pad, means loosely
ing pad and said corresponding leg, means for
securing the upper end of each heating pad to
loosely securing the opposite margin of said heat
said bracket to adapt itself to the exterior suring pad to said corresponding leg to permit said
face of the part to be heated, the end of each of
heating pad to adapt itself to the‘exterior surface
said brackets being formed to ?t under the said
of the part to be heated, and means yieldingly
downturned ?anges of said cover, and means
urging said corresponding leg of said casing to
yieldingly urging the legs of said casing toward
ward said part to be heated and thereby hold said
heating pad in ?rm thermal contact with said 65 each other and thereby hold said heating pad in
firm thermal contact with said surface.
surface.
7. An electrical contact heater for heating a
4. An electrical contact heater of the charac
part having a cover provided with downturned
ter described, comprising a U-shaped sheet metal
?anges embracing said part, comprising a U
casing adapted to embrace the part to be heat
shaped sheet metal casing having its cross part ar
ed the extremity of one of the legs of said cal,
ing being provided with an inturned ?ange, a
rigid electrical heating pad arranged within said
casing and loosely secured at one margin to said
inturned flange and in spaced relation to the
ranged over said cover and having depending
side legs embracing the sides of the part to be
heated, a rigid electrical heating pad loosely se
cured at its lower end to the lower extremity
of each of the legs of said casing and spaced
corresponding leg of said casing to provide a 75 from the corresponding leg of said casing to
"10
‘provide a thermal; insulating airspace between
each heating pad and the corresponding leg of
xterial interposed between said ?exible strip and
said cross part of said casing, and spring means
interposed between said ?exible strip and said
said vcasing, a bracket secured to the inside of
each leg of said casing adjacent the upper end
ofthe corresponding heating pad, means loosely
securing the upper end of each heating pad to
‘cross part of said casing and yieldingly ‘urging
said casing upwardly to hold said brackets ?rmly
ineng-agement with-the under sides of the down
said bracket to adapt itself to the exterior sur
face of the partto be heated, the end of each
of said brackets being formed to ?t under the
said downturned ?anges of said cover, means
yieldingly urging the legs of ‘said casing toward
each other and thereby hold said heating pad in
?rm thermal contact with said surface, and
spring means interposed between said cover and
said cross part of said casing and yieldingly urg
ing said casing upwardly to hold said brackets
?rmly in engagement with the under side of the
downturned ?anges of said cover.
8. An electrical contact heater for heating a
part having a cover provided with downturned
?anges embracing said part, comprising a U
shaped sheet metal casing having its cross part
arranged over said cover and havingr depending
Side legs embracing the sides of the part to be
heated, a rigid electrical heating pad loosely se
cured at its lower end to the lower extremity of
each of the legs of said casing and spaced from
the corresponding leg of said casing to provide a
thermal insulating air space between each heat
ing pad and the corresponding leg of said cas
ing, a bracket secured to the inside of each leg
of said casing adjacent the upper end of the
corresponding heating pad, means loosely se
curing the upper end of each heating pad to said
bracket to adapt itself to the exterior surfaceof
the part to be heated, the end of each of said
brackets being formed to ?t under the said down
turned ?anges of said cover, means yieldingly
turned ?anges of said; cover. ‘
10.
electrical contact heater of the _~char
acter described, comprising a U-shaped metal
casing adapted to embrace the part to be heated
and provided with inturned ?anges along the
edges of its side legs and cross part thereby to
provide internal pockets in its side legs and
cross part, an electrical heating pad loosely
15 mounted in each of the pockets of said side legs
thereby to permit said heating pads to adapt
20
25
30
35
urging the legs of said casing toward each other
and thereby hold said heating pad in ?rm ther
themselves to the surface of said part to be heated
and said pads being held in spaced relation to
said side legs to provide thermal insulating air
spaces between said heating pads and side legs,
insulating material arranged in the pocket of
said cross part of said casing and engaging the
corresponding surface of the part to be heated,
and means for yieldingly urging the legs of said
casing toward each other to hold said heating
pads in ?rm thermal contact with the part to
be heated.
11. A heating apparatus comprising in com
bination a plurality of heating pads arranged in
thermal contact with two sides of the part to
be heated, a ?exible channel-shaped casing em
bracing said two sides of the part to be heated
and said heating pads in spaced relation thereto
and bodily movable with respect thereto, spring
means interposed between each of said heating
pads and the adjacent part of said casing, and
a rigid U-shaped holder embracing said casing
and engaging the exterior thereof in compres
sive relation thereto and in position to transfer
the resultant of the forces of said spring means
mal contact with said surface, a ?exible strip 40
on one of said sides of said part to be heated
arranged under said cross part of said casing
to said spring means on the other of said sides
‘and secured at its ends to the opposite ends of
of said part to be heated.
said cross part, and spring means interposed be
12. A heating apparatus comprising in combi
tween said ?exible strip and said cross part of
nation a plurality of heating pads arranged in
thermal contact with two sides of the part to be
heated, a ?exible channel-shaped casing embrac
ment with the under sides of the downturned
ing said two sides of the part to be heated and
?anges of said cover.
said heating pads in spaced relation thereto and
9. An electrical contact heater for heating a
part having a cover provided with downturned 50 bodily movable with respect thereto, spring means
interposed between each of said heating pads and
?anges embracing said part, comprising a U
the adjacent part of said casing, and a rigid
shaped sheet metal casing having its cross part '
U-shaped yoke secured to and embracing said
arranged over said cover and having depending
casing and engaging the exterior thereof in com
side legs embracing the sides of the part to be
heated, a rigid electrical heating pad loosely 55 pressive relation thereto and in position to trans
fer the resultant of the forces of said spring
secured at its lower end to the lower extremity
means on one of said sides of said part to be
of each of the legs of said casing and spaced
heated to said spring means on the other of
from the corresponding leg of said casing to pro
said sides of said part to be heated.
vide a thermal insulating air space between each 13. An electrical contact heater of the char
heating pad and the corresponding leg of said 60
acter described, comprising a casing of resilient
casing, a bracket secured to the inside of each
material having legs adapted to embrace the
leg of said casing adjacent the upper end of the
part to be heated, a rigid electrical heating pad
corresponding heating pad, means loosely secur
arranged inside of said casing and loosely secured
ing the upper end of each heating pad to said
bracket to adapt itself to the exterior surface 65 to one leg thereof to permit it to adapt itself to
the exterior surfaces of the part to be heated,
of the part to be heated, the end of each of said
and means yieldingly urging said legs of said
brackets being formed to ?t under the said down
casing
toward each other to hold said heating
turned ?anges of said cover, means yieldingly
pad in ?rm thermal contact with said surface,
urging the legs of said casing toward each other
70 comprising a rigid yoke secured to said casing
said casing and yieldingly urging said casing up
wardly to hold said brackets ?rmly in engage
and thereby hold said heating pad in ?rm
thermal contact with said surface, a ?exible strip
arranged under said cross part of said casing
and secured at its ends to the opposite ends
of said cross part, a packing of insulating ma 75
and having rigid legs embracing said casing and
adapted to engage retaining lugs provided on the
exterior of the legs of said U-shaped casing.
14. An electrical contact heater of the char
acter described, comprising a casing of resilient
2,410,862
11
12
material having legs adapted to embrace the
means securing the opposite side of said heating
pad to said corresponding leg to permit said
heating pad to adapt itself to the exterior sur
face of the part to be heated, and means yield
ingly urging said corresponding leg of said casing
toward said part to be heated and thereby hold
said heating pad in firm thermal contact with
said surface.
part to be heated, the extremity of one of the
legs of said casing being provided with an in
turned ?ange, a rigid electrical heating pad ar
ranged within said casing and loosely secured
at one side to said inturned ?ange and in spaced
relation to the corresponding leg of said casing
to provide a thermal insulating air space between
said heating pad and said corresponding leg,
ALFRED A. REISER.
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