Патент USA US2407713код для вставки
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.