US2392311A - Sealing of metallic members in molded casings - Google Patents

Sealing of metallic members in molded casings Download PDF

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Publication number
US2392311A
US2392311A US459768A US45976842A US2392311A US 2392311 A US2392311 A US 2392311A US 459768 A US459768 A US 459768A US 45976842 A US45976842 A US 45976842A US 2392311 A US2392311 A US 2392311A
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sealing
casing
unit
molded
metallic members
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US459768A
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Arthur J Christopher
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AT&T Corp
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Bell Telephone Laboratories Inc
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
    • H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
    • H01G2/12—Protection against corrosion

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  • Neoprene A. J. CHRISTOPHER SEALING OF METALLIC MEMBERS IN MOLDED CASINGS Filed Sept. 26, 1942 lNl/ENTOR A. .l. C HIP/5 TOPHER BYW ATTORNEY der the trade-name of Neoprene.
  • This invention relates in general to sealing of terminal leads in molded casings for condensers and similar electrical apparatus.
  • the unit 5 as disclosed is a paper-wound unit comprising conducting foils or electrodes interleaved with sheets of insulating material, such as paper, and wound in the shape of a flat coil.
  • This unit may be of the stacked type consisting of alternate plates or electrodes is a metallic clamping member l3 which is crlmped it is, therefore, an object of the present invention to provide a seal for encased apparatus which will be maintained over wide temperature variations and thus prevent the entrance of moisture within the casing.
  • the terminal leads are provided with a coating of a resilient insulating material over that portion of the leads which is later in contact with the molded casing, this coating being placed under compression by the molding operation.
  • this coating as applied should have a thickness of not less than ten mils, it should be resistant to temperatures as high as 300 F., and not affected by min eral oil or grease.
  • Fig. 1 is a viewln perspective of a molded condenser ernbodying the wfeatures of the invention.
  • Fig. 2 is a perspective view of the condenser A material which has been found particularly satisfactory for this use is the l and mneripol.
  • the clamping members are electrically connected to the conducting sheets or electrodes of the condenser unit by means of thin metallic strips 0, 8 which extend from the electrodes to the clamping plates and are secured thereto by soldering.
  • the terminal leads 0, 0 are firmly secured to the clamping plates 0, preferably by butt-welding. After the unit is thus assembled the portions of the terminal leads 9, 0 where they are connected to the clamping plates 0, 0
  • a relatively thick coating in of a resilient insulating material capable of maintaining its characteristics when subjected to molding temperatures as high as 300 F. and operating temperatures up to 200 F.
  • this material is a Neoprene cement, such as is extensively used, and comprises a polymerized chloroprene compounded with a vulcanizer and suitable solvents.
  • Neoprene other synthetic rubbers having suitable characteristics may be employed, such as, for example, Resistoflex
  • This coating preferably covers the joint of the terminal leads with the clamping plates and extends outward for a distance of a quarter of an inch or more.
  • the completed unit is thoroughly dried as, for example, by subjecting it to a temperature of 275 F. for a period of several hours and is impregnated with a suitable insulating material, suchas mineral oil. During the drying process the solvents are driven out of the coating material and it is properly cured.
  • the impregnated unit is then placed in a suitable mold and provided with a molded casing l l through which the terminal leads 0, 9 extend. During this operation the coating material is subjected to a temperature of from 300 F. to 330 F- Due to .the pressure exerted in the. molding operation,
  • any action which might take place due to difi'erence in temperature coeflicients of the molding material and the terminal leads is compensated for by the resiliency of the coatings-and moisture is prevented from entering the casing along the terminal leads.
  • the unit with the Neoprene-coated-terminals is subjected to a temperature of 300 for a period of one and one-half hours thus properly curing the material aseau closely surrounding that portion of said terminal lead which extends through and is contiguous with said casing, said coating being maintained-under compression at a pressure substantially equal to the molding pressure of said rigid casing.
  • a rigid molded casing of insulating material an electrical unit impregnated in oil completely surrounded by said rigid casing, a terminal lead extending through said casing and a coating of polymerized chloroprene closely surrounding that portion of said terminal lead which extends through and is contiguious with said casing, said coating extending overtthe joint between said terminal lead and said unit and being under compression at a pressure substantially equal'to the molding pressure 20 of said rigid casing.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Casings For Electric Apparatus (AREA)

Description

Jan. 8, 1946.
A. J. CHRISTOPHER SEALING OF METALLIC MEMBERS IN MOLDED CASINGS Filed Sept. 26, 1942 lNl/ENTOR A. .l. C HIP/5 TOPHER BYW ATTORNEY der the trade-name of Neoprene.
Patented Jan. 8,1946
I SEALING OF METALLIC MEMBERS IN MOLDED CASINGS Arthur J. Christopher, Teaneck, N. .l., assignor to Bell Telephone Laboratories, Incorporated, New York, N Y., a corporation of New "York Application September 26, 1942, Serial No. 459,768
This invention relates in general to sealing of terminal leads in molded casings for condensers and similar electrical apparatus.
It is a common practice in the design of small condensers, such as are extensively used in radio and similar circuits, to enclose the condenser unit in a molded casing through which the terminal leads extend. Such condensers are sometimes subjected to extreme temperature ranges as in the case of radio sets mounted in tanks where the apparatus may be called upon to function satisfactorily at temperatures ranging from as low as-tO F. to as high as 190 F. or even higher. in view of the difierence in temperature coefilcients ofpthe molding materials and the metallic conductors, a good seal is not maintained over such wide temperature variations and moisture enters the casing along the terminal leads and deleterlously affects the electrical constants of the condenser.
2 Claims. (Cl. 174-18) the sealing of metallic members, and more particularly to the unit of Fig. 1 before-molding the casing thereabout.
Referring to the drawing, the unit 5 as disclosed is a paper-wound unit comprising conducting foils or electrodes interleaved with sheets of insulating material, such as paper, and wound in the shape of a flat coil. This unit, however, so far as the invention is concerned, may be of the stacked type consisting of alternate plates or electrodes is a metallic clamping member l3 which is crlmped it is, therefore, an object of the present invention to provide a seal for encased apparatus which will be maintained over wide temperature variations and thus prevent the entrance of moisture within the casing.
It is a further object of the invention to provide such a seal which will not be affected by mineral oil or similar materials which may be used for impregnating the condenser units.
To attain these objects and in accordance with the features of the invention, the terminal leads are provided with a coating of a resilient insulating material over that portion of the leads which is later in contact with the molded casing, this coating being placed under compression by the molding operation. Preferably, this coating as applied should have a thickness of not less than ten mils, it should be resistant to temperatures as high as 300 F., and not affected by min eral oil or grease.
polymerized chloroprene, commonly known un- Other materials which are satisiactory under certain conditions are Resistoflex, supplied by E. I. du Pont de Nemours 8: Co., Inc, and Ameripol, supplied by the B. F. Goodrich Company.
The invention may be more clearly understood by reference to the accompanying drawing, in which:
Fig. 1 is a viewln perspective of a molded condenser ernbodying the wfeatures of the invention; and
Fig. 2 is a perspective view of the condenser A material which has been found particularly satisfactory for this use is the l and mneripol.
to the outer insulating sheets or backing plates "8, l. The clamping members are electrically connected to the conducting sheets or electrodes of the condenser unit by means of thin metallic strips 0, 8 which extend from the electrodes to the clamping plates and are secured thereto by soldering. The terminal leads 0, 0 are firmly secured to the clamping plates 0, preferably by butt-welding. After the unit is thus assembled the portions of the terminal leads 9, 0 where they are connected to the clamping plates 0, 0
are provided with a relatively thick coating in of a resilient insulating material capable of maintaining its characteristics when subjected to molding temperatures as high as 300 F. and operating temperatures up to 200 F. Preferably this material is a Neoprene cement, such as is extensively used, and comprises a polymerized chloroprene compounded with a vulcanizer and suitable solvents. In place of Neoprene other synthetic rubbers having suitable characteristics may be employed, such as, for example, Resistoflex This coating preferably covers the joint of the terminal leads with the clamping plates and extends outward for a distance of a quarter of an inch or more.
The completed unit is thoroughly dried as, for example, by subjecting it to a temperature of 275 F. for a period of several hours and is impregnated with a suitable insulating material, suchas mineral oil. During the drying process the solvents are driven out of the coating material and it is properly cured. The impregnated unit is then placed in a suitable mold and provided with a molded casing l l through which the terminal leads 0, 9 extend. During this operation the coating material is subjected to a temperature of from 300 F. to 330 F- Due to .the pressure exerted in the. molding operation,
apparatus may be subjected. Any action which might take place due to difi'erence in temperature coeflicients of the molding material and the terminal leads is compensated for by the resiliency of the coatings-and moisture is prevented from entering the casing along the terminal leads.
When a mica stacked unit is employed, the unit with the Neoprene-coated-terminals is subjected to a temperature of 300 for a period of one and one-half hours thus properly curing the material aseau closely surrounding that portion of said terminal lead which extends through and is contiguous with said casing, said coating being maintained-under compression at a pressure substantially equal to the molding pressure of said rigid casing.
2. In an electrical device, a rigid molded casing of insulating material, an electrical unit impregnated in oil completely surrounded by said rigid casing, a terminal lead extending through said casing and a coating of polymerized chloroprene closely surrounding that portion of said terminal lead which extends through and is contiguious with said casing, said coating extending overtthe joint between said terminal lead and said unit and being under compression at a pressure substantially equal'to the molding pressure 20 of said rigid casing.
ARTHUR J. cnmsrorrma.
US459768A 1942-09-26 1942-09-26 Sealing of metallic members in molded casings Expired - Lifetime US2392311A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468845A (en) * 1944-11-20 1949-05-03 Union Switch & Signal Co Alternating electric current rectifier
US2940161A (en) * 1955-10-11 1960-06-14 Western Electric Co Methods of making encapsulated electrical devices
US2941258A (en) * 1954-04-05 1960-06-21 Mallory & Co Inc P R Method of assembling and encapsulating a plurality of electrical condensers
US3037266A (en) * 1957-01-30 1962-06-05 Allen Bradley Co Method for making sealed resistors
US3217087A (en) * 1961-03-17 1965-11-09 Sprague Electric Co Encased electrical component
US3388212A (en) * 1965-07-07 1968-06-11 Gen Electric Plastic bushing for electrical apparatus and method of making
US3824518A (en) * 1973-03-05 1974-07-16 Piconics Inc Miniaturized inductive component
US3860896A (en) * 1971-01-13 1975-01-14 Philips Corp Air inductive ballast
US3864798A (en) * 1972-09-01 1975-02-11 Siemens Ag Method of encapsulating end-contacted electrical components
US4611092A (en) * 1985-02-21 1986-09-09 Tektronix, Inc. Surface mount package for toroids
AU625888B2 (en) * 1989-09-05 1992-07-16 Thomson-Csf Imperviously sealed and compact electronic module
US5698819A (en) * 1995-02-23 1997-12-16 Standex International Corporation Surface mount electronic reed switch component
US6104267A (en) * 1998-10-05 2000-08-15 Standex International Corp. Surface mount electronic reed switch component with transverse lead wire loops

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2468845A (en) * 1944-11-20 1949-05-03 Union Switch & Signal Co Alternating electric current rectifier
US2941258A (en) * 1954-04-05 1960-06-21 Mallory & Co Inc P R Method of assembling and encapsulating a plurality of electrical condensers
US2940161A (en) * 1955-10-11 1960-06-14 Western Electric Co Methods of making encapsulated electrical devices
US3037266A (en) * 1957-01-30 1962-06-05 Allen Bradley Co Method for making sealed resistors
US3217087A (en) * 1961-03-17 1965-11-09 Sprague Electric Co Encased electrical component
US3388212A (en) * 1965-07-07 1968-06-11 Gen Electric Plastic bushing for electrical apparatus and method of making
US3860896A (en) * 1971-01-13 1975-01-14 Philips Corp Air inductive ballast
US3864798A (en) * 1972-09-01 1975-02-11 Siemens Ag Method of encapsulating end-contacted electrical components
US3824518A (en) * 1973-03-05 1974-07-16 Piconics Inc Miniaturized inductive component
US4611092A (en) * 1985-02-21 1986-09-09 Tektronix, Inc. Surface mount package for toroids
AU625888B2 (en) * 1989-09-05 1992-07-16 Thomson-Csf Imperviously sealed and compact electronic module
US5698819A (en) * 1995-02-23 1997-12-16 Standex International Corporation Surface mount electronic reed switch component
US6104267A (en) * 1998-10-05 2000-08-15 Standex International Corp. Surface mount electronic reed switch component with transverse lead wire loops

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