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Патент USA US2407713

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Patented Sept. 17, 1946
2,407,712.
UNITED STATES PATENT- GFFICE
2,407,712
SOLENOID
Harold J. Luth, Muskegon, Mich., assigner to The
Brunswick-Balke-Collender Company, Chicago,
Ill., a corporation of Delaware
Application J une 11, 1943, Serial No. 490,421
5 Claims. (Cl. F75-_21)
2
This invention relates more particularly to ex
tremely long and slender solenoids wherein the
core and winding of `the lsolenoid are not self
supporting.
The general object of the invention is to provide
a solenoid of this type having a rigid,vnon-metal-
the grain of the wood veneer running lengthwise
of the solenoid, `and lastly, additional layers of
impregnated paper or cloth, or both.
Preferably a high tensile spinning paper is used
which has been impregnated with an amount of
heat-setting phenol formaldehyde resin equal to
lic shell or casing which can be constructed about
the solenoid and serve as a means of support
about 35 percent of the Weight of the paper. A
therefor.
A more particular object of the invention is to
provide a rigid supporting structure for solenoids
having high permeability cores and a high sensi
.tivity which is affected by deflection of the as
soluble in a solvent such as alcohol or water, and
which can be evaporated olf, may be used for lthis
sembly.
heat-setting phenol formaldehyde resin which is
purpose. A resin manufactured by the Bakelite
Corporation and identiñed by their number
XVl'6238 has been used successfully. By paper
which has been impregnated is meant paper
Another object of the invention is to provide 15 which may be coated on one side, or both sides,
a novel method whereby such a rigid casing can
be constructed about the solenoid. Another ob
ject of the invention is to provide a solenoid with
a rigid and durable casing which will also pro
or entirely filled with resin. The veneer is pref
erably coated on two sides.
Fig. 4 illustrates the manner in which the cas
ing I3 may be applied .to the solenoid winding.
tect the winding of the solenoid from mechanical 20 A sheet of paper I4, coated with a suitable resin
injury, or injury due to the elements or from
20 (Fig. 5) on its upper side, has been wound
handling. y
onto the solenoid coil until there are several
A further object of the invention is to provide
turns of the paper on the winding. Veneer I5
a solenoid with a casing which becomes an in
coated with resin on its surfaces at 2| has been
tegral part thereof.
placed upon the upper coated surface of the paper
Other objects will become readily apparent from
I4 in position so .that as the winding of the paper
the following detailed description, taken in con
onto the solenoid continues, there is placed on
nection with the vaccompanying drawing, in
the solenoid several turns of veneer separated by
which:
the sheet of .paper I4 which extends continuously
Fig. 1 is an elevational view of va solenoid con 30 to the end _22. As the winding operation con
structed in accordance with the invention.
tinues, additional layers `of resin coated paper
Fig. 2 is an enlarged fragmentary view thereof,
are applied on top of the veneer-paper layers so
partly in'central section.
that the outer portion of the casing consists of
Fig. 3 is a section along the line 3--3 of Fig. 2.
several layers of the paper. The entire assembly
Fig. 4 is a view illustrating a method of making
is then cured under heat and pressure, Vas by
the form of the invention of Figs. 1 to 3.
jacketing the assembly in a sheet of rubber which
Fig. 5 is an enlarged fragmentary View of a part
lhas been relongated from 150 to 200 per cent and
of Fig. 4.
`applied under tension, and thereafter placed in
While there is illustrated in the drawing and
an oven ata .temperature of 250° F. for a period
herein described in detail a preferred form of 40 of two hours, utilizing the process disclosed in a
the invention, it is to be understood that the in
.co-pending application, Serial No. 483,540, filed
vention is not to be limited to the particular form
April 19, 1943, by Harold J. Luth, Herman B.
and arrangement shown, it being contemplated
Scheidemantel and Sydney R. Krupnick.
that various modifications may be made by .those
In the event that the solenoid is to have an
skilled in the art Without departing from the 45
outer
casing of cloth as described immediately
spirit and scope of the invention as set forth in
the appended claims.
hereafter, the squeezing effect obtained by jack
eting the solenoid in rubber can be very nearly
In Figs. 1 to 3 of the drawing there is illus
duplicated by tightly Winding the last layer of
trated a solenoid having a high permeability core
I0, ends II, a Winding I2, and a casing I3. In 50 cloth in a spiral under tension, securely fasten
ing the two ends and then curing. During the
this form of the invention the casing I3 is Wound
curing operation the cloth jacket will tend to
in layers onto the solenoid winding and consists
of several turns I4 of resin impregnated paper or
shrink and harden about the entire assembly,
cloth, several additional turns of impregnated
making the mass compact. Although .this
paper or cloth with wood veneer I5 interleaved, 55 method can be used, for extreme rigidity `and
3
hardness the method using a rubber jacket is
preferred.
4
the solenoid and operating to stiffen the solenoid
and prevent bending thereof when said means
The solenoid constructed as herein disclosed is
has been subjected to heat to cause the resin to
extremely rigid and adequately protected against
mechanical injury or injury due to the elements Ci
set.
2. A solenoid comprising a relatively long metal
or from handling. A solenoid constructed in ac
core, a Winding on said core comprising a plu
cordance with the invention, 21/2'l in diameter
and 6' long and containing 6l) pounds of copper
rality of layers of insulated wire and combining
wire and core, has been wound with four turns of
substantial weight, and means for enclosing the
Íwinding and preventing flexure of the solenoid
impregnated paper, followed by four complete Í
with the core to form an elongated element of
turns of paper and veneer, siX turns of paper and ~ Y lwhen supported in a horizontal position and by
its ends, comprising a sheet of paper impregnated
with a heat-.setting phenol formaldehyde resin
wound in tight layers over the outer layers of
said Winding and a sheet of resin impregnated
thin wood »reinforcing material wound between a
one turn of impregnated cloth on the outside. A
solenoid so constructed and thereafter cured as
hereinbefore specified, when supported at its two
ends, had a deflection at the center on the order
of als of an inch. Under the method herein set
pluralityof layersv of said paper with its fibers
extending mainly lengthwise of the solenoid, said
forth the entire assembly becomes an integral
unit and the solenoid is entirely self-supporting.
During the entire process the solenoid is pref
erably supported on a flat table or on parallel
enclosing means being subjected to heat to cause
. the resin to set and operating to stiffen the' sole
noid and prevent bending thereof.
rollers or other suitable means which will prevent
distortion or deflection until the curing and set
ting operations are completed.
In using phenol formaldehyde resins or ce*
ments, approximately 4% of an acid or alkaline
catalyst is used to bring about the hardening.
'
per impregnated with a heat-setting phenol
formaldehyde resin wound in tight layers over
the outer surface of said winding, and a sheet
of resin impregnated wood wound between con'
secutive layers of said paper with its fibers ex
Although an adhesive or resin of the type here
irrbefore set forth is satisfactory andvdesirable,
it is not intended `to limit the invention to the /
use of any particular resin or combining agent.
It would be possible, for example, to make a
similar solenoid casing by using urea formalde
hyde bonding agents which are thermo~setting, or
«
3. A solenoid comprising a long central core,
an insulated winding around said core„and means
enclosing the winding comprising a sheet of pa
, tending longitudinally of the solenoid and oper
by using shellac which is thermo-plastic. In the
case of a shellac, however, it would be necessary
to cool the solenoid while it is hung in a vertical
position.
.As a veneer, birch and maple have been used.
ating to stiffen the solenoid and prevent bending
thereof when said enclosing means has been sub
jected to heat to cause the resin to set.
4. A solenoid comprising a long central core,
an insulated winding around said core, and means
enclosing the winding comprising a sheet of cloth
impregnated with a heat-setting phenolforrn
aldehyde resin wound in tight layers over the
outer surface of said Winding, and a thin vsheet
Obviously other types of wood and other low
density, high-tensile value materials might be 40 of reinforcing wood material wound between ín
termediate layers of said cloth and operating to
used to make a casing having suitable rigidity.
stiffen the solenoid and prevent bending thereof
An impregnated cloth can readily be substituted
when said enclosingv means has been subjected
for paper. If an extreme degree of waterproof
`ness is desired, the veneer can first be treated by
saturation with a phenol resin dissolved in alco
hol, or by use of a hydrophilic resin in water
in the same manner as wood is treated for im
pregnating wood, a process well known in the art.
to heat to cause the resin to set.
5. A solenoid comprising a relatively long cy
lindrical core, a Winding on said core comprising
a plurality of layers of insulated wire `and of
substantial weight, and means for enclosing the
winding and preventing iiexure of the solenoid
In the examples hereinbefore given, the paper
when supported in a horizontal position and by
‘was approximately .005 of an inch in thickness,
its ends, comprising a sheet of thin sheet ,mate
Vand the veneer was .05 of an inch, the resulting
rial impregnated with a heat-setting phenol
casing being approximately 1/8 of an inch thick.
formaldehyde resin Wound in tight layers over
I claim as my invention:
the outer layer of said winding, and a sheet of
l. A solenoid comprising a core, an insulated
winding thereon, means outside of said winding 65 wood woundA between consecutive layers of said
thin sheet material and operating toI stiiîen the
and surrounding it comprising a sheet of mate
solenoid and prevent bending thereof when said
rial impregnated with a heat-setting resin wound
enclosing means has been subjected to heat to
around the winding in layers, and a thin sheet
cause the resin to set.
‘
of wood wound intermediate certain layers of said
impregnated material and with its grain running 60
parallel to the axis of the solenoid to reinforce
HAROLD J. LUTH.
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