US3745498A - Coil form - Google Patents

Coil form Download PDF

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Publication number
US3745498A
US3745498A US00268420A US3745498DA US3745498A US 3745498 A US3745498 A US 3745498A US 00268420 A US00268420 A US 00268420A US 3745498D A US3745498D A US 3745498DA US 3745498 A US3745498 A US 3745498A
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US
United States
Prior art keywords
circuit board
printed circuit
coil form
antenna
affixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00268420A
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English (en)
Inventor
R Hagood
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Motorola Solutions Inc
Original Assignee
Motorola Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Motorola Inc filed Critical Motorola Inc
Application granted granted Critical
Publication of US3745498A publication Critical patent/US3745498A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/02—Variable inductances or transformers of the signal type continuously variable, e.g. variometers

Definitions

  • ABSTRACT A molded plastic tubular body having a copper sleeve fixedly engaged about one end thereof adapted to be inserted into a printed circuit board and soldered thereto for electrical contact and mechanical bond
  • This invention pertains to a coil form for receiving coils thereon and mounting said coil form in mechanical engagement with a printed circuit board.
  • Electronic circuits such as radio receivers and transmitters and the like, utilize a number of fixed and variable or tunable coils and inductances. These coils must be wound 1 on a form and mechanically mounted on a base or the like. In many instances, the base is a printed circuit board and mechanical connection thereto may be somewhat difficult.
  • FIG. I is a view in side elevation illustrating the coil form positioned in a printed circuit board, portions thereof broken away and shown in sections;
  • FIG. 2 is an enlarged view in top plan of the structure illustrated in FIG. land
  • FIG. 3 is an enlarged view in bottom plan of the structure illustrated in FIG. 1, with the printed circuit board removed.
  • the numeral 10 generally designates an elongated tubular body formed of electrically insulating material, such as by molding plastic or O the like.
  • the body 10 includes a first end portion 11,
  • the central portion 12 has a circular cross section with the desired diameter and length to receive thereon coil means, such as antenna coils or the like.
  • the thickness of the walls of the body 10 are sufficient to provide the desired strength without introducing unnecessary weight or use of material.
  • the first end 1 1 has a generally circular cross section, although it should be understood that any desired shape might be utilized, and is separated from the central portion 12 by a radially outwardly extending collar 15.
  • the first end 11 is inserted through an opening defined by a printed circuit board 16 and the collar 15 positions the body 10 relative to the printed circuit board 16.
  • the collar 15 is formed as an integral part of the body 10 but it should be understood that other positioning means might be affixed to the body 10 after the formation thereof, if desired.
  • a thin sleeve 20 of solderable material in this embodiment nickel silver or other corrosive resistant, solderable material, is affixed in coaxial engagement over the outer periphery of the first end 11 of body 10.
  • the material may, in addition, be an electrical conductor for contact between a coil and the printed circuit board 16, as will be described presently.
  • the sleeve 20 may be affixed to the first end 11 by molding the body 10 onto the sleeve 20 or by forming the sleeve 20 as a snap-ring which can be firmly and fixedly snapped onto the first end 11.
  • the combined diameter of the first end 11 with the sleeve 20 affixed thereover is such that it mates snuggly with the opening in the printed circuit board 16.
  • Conductors 21 printed on the board 16 so as to overlie at least portions of the periphery of the opening through the board 16 can be mechanically attached to the sleeve 20 by some convenient method, such as wave soldering or the like.
  • some convenient method such as wave soldering or the like.
  • a longitudinally extending slit 22 is formed in the sleeve 20 to prevent the sleeve20 from acting as a shorted turn on the coil form. While it has been found through experimentation that the sleeve .20, even if completely encircling the end 11, does not detract from'the operation of a coil 23 wound on the central portion 12 of the form 10 if the coil 23 is positioned sufficiently distant on the form from the sleeve 20, it may be desirable in some instances to provide one or more slits 22 therein. In the present embodiment the coil 23 is wound around the central portion 12 and the ends are adapted to be connected to the associated circuitry.
  • the sleeve 20 may add some inductance to the coil, which can be determined during initial design.
  • a longitudinally extending key or ridge 40 extends radially outward from the lower portion 1 1 of the form through the slit 22.
  • the ridge 40 is utilized to orient the coil form in rotational position within the hole in the printed circuit board 16, during assembly. In some instances the rotational orientation of the coil form is not essential and the ridge 40 may be eliminated. Also, in some instances additional longitudinally extending ridges may be desirable.
  • the antenna 25 has a semicircular portion adapted to be coaxiallyengaged within the opposite end portion 13. One end of the semicircular portion is bent radially outwardly to be engaged in the slit in the coil form to prevent relative rotation of the antenna contact 25.
  • the antenna contact 25 is formed from a single piece of resilient material, such as berylco or the like, and an irregularly shaped elongated piece thereof, which extends longitudinally from the outer end of the semicircular piece, is bent so as to extend over the end of the body 10 in axially spaced relationship therefrom.
  • the portion of the contact 25 extending laterally across the end of the body 10 is resiliently affixed at one end so that the portion is springable in an axial direction.
  • This axially extending portion of the contact 25 extends through an opening in a housing 30 and is designed to frictionally engage an antenna external of the housing 30 to provide an electrical contact therewith. While it should be understood that the coil form described may be utilized for coils other than antenna coils, in which case the antenna contact 25 will not be utilized, when the coil form is utilized for an antenna coil and the antenna contact 25 is affixed to one end thereof, one end of the coil 23 may be attached directly to the antenna contact 25.
  • the central opening through the body 10 has a plurality of longitudinally extending, inwardly directed ridges 36, which in this embodiment have a generally triangularly shaped cross section. While it should be understood that the ridges 36 might have substantially any configuration, they should be constructed so as to be relatively easily deformed.
  • the core 35 is generally cylindrically shaped with external threads thereon and upon a slight initial forcing thereof, may be threadedly engaged in the opening through the body 10.
  • the ridges 36 deform to form internal threads for receiving the core 35 therebetween and for allowing longitudinal movement thereof for tuning the coil 23 wrapped around the body 10. It should be understood that double tuned coils might be provided on the body 10 by eliminating the antenna contact 25 and threading a second core into the opposite end of the body 10.
  • an improved coil form which can be easily constructed and installed by soldering to a printed circuit board or the like.
  • Some form of resilient contact may be provided at one end thereof, if desired,
  • tuning cores may be threadedly engaged in a central opening therethrough to render tunable any coils wound thereon.
  • positioning devices may be incorporated to orient the coil form relative to a printed circuit board, both in heighth and in rotational position: The installation of the coil form is greatly simplified because it is mechanically mounted by a simple wave soldering step, or the like, and does not require any additional application of adhesives, epoxies, etc., or the consequent drying or curing thereof. Further, in some instances the mechanical and electrical connections can be made simultaneously.
  • An improved coil form adapted to be mounted in an opening defined by a printed circuit board or the like, said coil form comprising:
  • a tubular body of electrically insulating material having one end formed to mate with the opening;
  • positioning means affixed to said body and extending outwardly from the outer surface thereof for positioning said body relative to the printed circuit board;
  • solderable means affixed to the outer surface of said body adjacent the one end for engaging conducting portions of the printed circuit board to mechanically mount the coil form.
  • solderable means includes a sleeve of c0nducting material at least partially encircling the body at one end.
  • positioning means further includes an axially extending ridge for orienting the rotational position of the body relative to the printed circuit board.
  • An improved coil form as set forth in claim I having in addition axially extending ridges affixed to the inner surface of the body in radially inwardly extending relationship, said ridges being formed of material which will form threads upon the insertion of an externally threaded, cylindrical core therein.
  • An improved coil form as set forth in claim I having in addition an antenna contact affixed to the end opposite the one end.
  • antenna contact includes electrically conducting resilient material affixed to the opposite end of the body for electrical contact with a coil wound on the body and extending generally axially outward from the body for resilient electrical contact with an antenna.
  • an improved tunable antenna coil form therefor comprising:
  • a tubular molded plastic body having one end thereof engaged in an opening defined within the printed circuit board;
  • a sleeve formed of solderable material affixed to the outer surface of said body in coaxial alignment adjacent the one end thereof and soldered to conductors on the printed circuit board for mechanical and electrical contact therewith;
  • resilient antenna contact means affixed to said body adjacent the end opposite the one end and extending generally axially outwardly therefrom into electrical contact with the antenna;
  • a method of mechanically mounting a coil form to a printed circuit board comprising the steps of:

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Support Of Aerials (AREA)
  • Details Of Aerials (AREA)
  • Coils Or Transformers For Communication (AREA)
  • Storage Of Web-Like Or Filamentary Materials (AREA)
US00268420A 1972-07-03 1972-07-03 Coil form Expired - Lifetime US3745498A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26842072A 1972-07-03 1972-07-03

Publications (1)

Publication Number Publication Date
US3745498A true US3745498A (en) 1973-07-10

Family

ID=23022923

Family Applications (1)

Application Number Title Priority Date Filing Date
US00268420A Expired - Lifetime US3745498A (en) 1972-07-03 1972-07-03 Coil form

Country Status (6)

Country Link
US (1) US3745498A (enrdf_load_stackoverflow)
JP (1) JPS4946361A (enrdf_load_stackoverflow)
CA (1) CA993062A (enrdf_load_stackoverflow)
DE (1) DE2333815A1 (enrdf_load_stackoverflow)
GB (1) GB1401402A (enrdf_load_stackoverflow)
IL (1) IL42657A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5648788A (en) * 1995-04-03 1997-07-15 D & M Plastics Corporation Molded cellular antenna coil
US20090058590A1 (en) * 2005-05-13 2009-03-05 Rupert Aumueller Electronic component and method for fixing the same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08912B2 (ja) * 1982-09-29 1996-01-10 エクソン・リサーチ・アンド・エンジニアリング・カンパニー ポリジアルキルフマレート―ビニルアセテート共重合体とロウ―ナフタレン縮合物脱ロウ助剤との配合を用いる含ロウブライトストックの溶剤脱ロウ
JP3841404B2 (ja) 2002-02-22 2006-11-01 東邦化学工業株式会社 新規脱ロウ助剤

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5648788A (en) * 1995-04-03 1997-07-15 D & M Plastics Corporation Molded cellular antenna coil
US20090058590A1 (en) * 2005-05-13 2009-03-05 Rupert Aumueller Electronic component and method for fixing the same
US7973634B2 (en) * 2005-05-13 2011-07-05 Wuerth Elektronik Ibe Gmbh Electronic component and method for fixing the same

Also Published As

Publication number Publication date
JPS4946361A (enrdf_load_stackoverflow) 1974-05-02
CA993062A (en) 1976-07-13
DE2333815A1 (de) 1974-01-17
IL42657A0 (en) 1973-10-25
IL42657A (en) 1976-12-31
GB1401402A (en) 1975-07-16
AU5765073A (en) 1975-01-09

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