EP0346315A2 - Fuss für eine bewegliche Antenne und Verfahren zu dessen Herstellung - Google Patents

Fuss für eine bewegliche Antenne und Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0346315A2
EP0346315A2 EP89850189A EP89850189A EP0346315A2 EP 0346315 A2 EP0346315 A2 EP 0346315A2 EP 89850189 A EP89850189 A EP 89850189A EP 89850189 A EP89850189 A EP 89850189A EP 0346315 A2 EP0346315 A2 EP 0346315A2
Authority
EP
European Patent Office
Prior art keywords
antenna
item
dish
magnet
holder
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.)
Withdrawn
Application number
EP89850189A
Other languages
English (en)
French (fr)
Other versions
EP0346315A3 (de
Inventor
Keld Einer Jensen
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.)
Celwave Rf Aps
Original Assignee
Celwave Rf Aps
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 Celwave Rf Aps filed Critical Celwave Rf Aps
Publication of EP0346315A2 publication Critical patent/EP0346315A2/de
Publication of EP0346315A3 publication Critical patent/EP0346315A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/1207—Supports; Mounting means for fastening a rigid aerial element
    • H01Q1/1221—Supports; Mounting means for fastening a rigid aerial element onto a wall

Definitions

  • the invention relates to an antenna foot of the kind disclosed in the preamble to claim 1.
  • This type of antenna foot is used to a great extent for movable antennae in connection with radio and/or radio telephone antennae for cars.
  • the side facing the car roof is covered with a cap of plastic or rubber, thus preventing the roof of the car from being scratched or damaged in any way when the antenna is mounted, taken off or moved.
  • the protective cap it is necessary for the protective cap to be rela­tively thin on the side facing the car, hereby ex­cluding the formation of too great a gap between the magnet poles and the metal roof of the car, which would otherwise reduce the magnetic forces which se­cure the foot of the antenna to the car roof.
  • the object of the invention is to provide an antenna foot of this kind which is arranged in such a manner that damage to the roof of the car is excluded, re­gardless of the way in which the antenna with the an­tenna foot is removed or mounted on the car roof.
  • the permanently secured protective element ensures that the downwards-facing edge of the antenna foot's dish-shaped holder can never come into contact with the roof of the car, and at the same time determines the distance of the antenna foot's magnet poles from the metal roof.
  • the protective element is configured as an annular, flexible or yielding item of half-hard material which is incapable of scratching or damaging the car roof. The distance between the metal parts of the an­tenna foot and the car roof is thus not established by these parts being separated by a thin membrane of rubber or plastic.
  • the permanent securing prevents any ingress of water in between the protec­tive element and the holder.
  • the permanent securing ensures that the antenna foot is always provided with the protective element, and one avoids the frequent situation with the known constructions, i.e. the protective cap gets lost and, for reasons of lack of time, it is necessary to use the antenna foot without the protective element and with consequent damage to the roof of the car.
  • the antenna foot according to the invention is pref­erably configured as disclosed and characterized in claim 3, whereby increased securing possibilities for the protective element are achieved, hereby enabling it to surround and adhere to the full extent of the edge of the dish-shaped holder.
  • the antenna foot according to the invention is configured as disclosed and characterized in claim 4, a number of advantages are achieved from the view of production technique, in that the manufacture of the antenna foot can be simplified, and one and the same material is used for both the assembly operation and the formation of the protective element, and these operations can therefore be effected simultaneously. It is a considerable technical simplification and a cost-reducing advantage to be able to assemble and join all of the parts together in one operation, e.g. in an injection moulding operation.
  • the antenna foot can be provided with a surface of non­-magnetic material over the dish-shaped holder, and with the embodiment disclosed and characterized in claim 7, one completely avoids having to undertake an external surface treatment of the dish-shaped holder, which is covered and protected by the pro­tective element.
  • a completely finished product is obtained via one injection moulding process. More­ over, the holder can be manufactured with less pre­cision, in that the moulding equalizes production tolerances and conceals marks and irregularities which arise in the production of the dish-shaped holder.
  • a preferred practical embodiment of the invention is disclosed and characterized in claim 8.
  • the annular slots with binding materal ensure that the magnetic circuit becomes completely as desired, i.e. with the main part of the field opposite the underside of the antenna foot so that strong magnetic fields are est­ablished through the metal roof of the car.
  • the same securing element secures both the magnet yoke and the antenna itself, which simplifies both the construc­tion and the assembly hereof.
  • the invention also relates to a method for the manu­facture of the antenna foot according to the inven­tion.
  • the method is preferably as disclosed and characterized in claim 9, i.e. all of the individual parts of the antenna foot are disposed and positioned in an injection mould arranged for this purpose, after which the moulding is effected so that at one and the same time the moulding is carried out of the protective element and a casting of the magnet item during the centering and formation of distance slots.
  • the magnet item is magentized.
  • This is preferably a ring magnet which is magnetized so that the one pole faces to­wards that side of the dish-shaped holder which is in direct contact with the ring magnet, and the other magnet pole faces away from the underside, i.e. down towards the car roof.
  • the underside of the antenna foot according to the invention can be finished in the final working as disclosed and characterized in claim 10.
  • the coating can be an application of lacquer, paint or other coating, or be a foil, for example a self-adhesive foil, which is applied so that the product is given an area printed with information for the user, ad­vertisement etc.
  • the an­tenna foot consists of a dish-shaped holder 1 formed in 1-3mm thick iron plate with a central threaded hole through which a screw 2 secures an antenna 3 on the top of the holder.
  • the dish-shaped holder 1 In the normal position of use, the dish-shaped holder 1 is thus open down towards that surface, e.g. a car roof, on which the antenna is to be placed.
  • the screw 2 also secures and centres a central soft-iron yoke 5.
  • Around the yoke 5 there is disposed a ring magnet 4, separated by a concen­tric mass 12, and thus an annular slot exists between the yoke 5 and the magnet 4.
  • annular slot filled out with a bind­ing material 11 which, as shown in fig. 2, extends over into an annular outer profile 6 via an area 10 running under the lower edge 7 of the dish-shaped holder 1, and thus the whole of the annular edge on the holder 1 is covered.
  • a bind­ing material 11 which, as shown in fig. 2, extends over into an annular outer profile 6 via an area 10 running under the lower edge 7 of the dish-shaped holder 1, and thus the whole of the annular edge on the holder 1 is covered.
  • its outer edge can be configured with an annular groove 9 or a similar arrangement, e.g. a series of annularly-extending holes, which will increase the adherence.
  • the underside of the antenna foot is covered with a foil 8, e.g. a self-adhesive foil.
  • a foil 8 e.g. a self-adhesive foil.
  • the moulding or binding material which comprises the protective element 6 with underpart 10 and the annu­lar distance slots 11 and 12, is configured, for ex­ample, of thermoplastic rubber, artificial rubber or synthetic resin, for example Perstorp Dryflex type DF, DFG or mixtures hereof; Akzo - Armitel injection moulding plastic; Polyurethane - the elastomer Elast­ogran or similiar materials.
  • a further cap 13 e.g. of metal, is used instead of a groove 9 to secure the annular protec­tive element 6, which can be in one with the annular moulding material between the magnet 4 and the holder 1, but which as shown can also be configured as an independent, encircling profile ring secured to the outer side of the holder 1 and reinforced and secured by the outer cap 13.
  • the protective element 6 is thus an independent, encircling profile ring which is mounted and secured after the rest of the antenna foot has been produced in the normal manner by cast­ing of the magnet item.
  • the pro­file ring 6 can be produced of the same material as the binding material 11 or of another material with other characteristics.
  • the encircling pro­tective element in such a manner that it surrounds the whole of the outer side of the holder 1, whereby a large contact surface is achieved and herewith a particularly strong adherence to the outer side of the holder 1, see right-hand half of fig. 4.
  • This embodiment is described in more detail later in con­nection with the method for the manufacture of the antenna foot.
  • the left-hand side of fig. 4 shows a sketch of a tool for use in the assembly of an antenna foot ac­cording to the invention and of the kind which is shown in figs. 1 and 2 of the drawing, and in the right-hand side is seen a sketch of a tool for use in the assembly of an embodiment where the moulded material completely surrounds the outer side of the antenna foot.
  • the bolt 2 is screwed through the yoke 5 firmly into the threaded hole in the hol­der 1, thus securing the yoke firmly in place cen­trally in the holder.
  • a ring magnet 4 is then mount­ed as shown, positioned with an annular distance slot in towards the yoke, and similarly so that an annular distance slot arises between the magnet and the edge of the holder.
  • the parts are now placed in the mould part 14 as shown, and the mould parts 15 and 16 are closed against the part 14, whereby the ring magnet 4 is secured in place.
  • a normal injection moulding can now be carried out with a suitable bind­ing material through an inlet hole 17 in the mould part 16.
  • both the encircling protective element around the edge of the holder 1 and the annular distance slots are formed around the magnet 4, which is hereby se­cured in the dish-shaped holder.
  • the outer side of the holder 1 is also covered with a layer of moulding material 18, for example 1.5 mm thick, ex­ cept for the area blocked by the ring mandrel 19 where the antenna is subsequently mounted.
  • a layer of moulding material for example 1.5 mm thick, ex­ cept for the area blocked by the ring mandrel 19 where the antenna is subsequently mounted.
  • the underside of the antenna foot can hereafter be finished if necessary, and covered with a coating 8 which, for example, is a self-adhesive foil, and the magnet item 4 is excited.
  • the mould can be arranged otherwise than shown in fig. 4. Normally, the mould will be arranged for the moulding of several units simultaneously, pos­sibly in different sizes so that optimum use is gained from the injection moulding machine.

Landscapes

  • Support Of Aerials (AREA)
EP19890850189 1988-06-08 1989-06-08 Fuss für eine bewegliche Antenne und Verfahren zu dessen Herstellung Withdrawn EP0346315A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DK3117/88 1988-06-08
DK311788A DK159746C (da) 1988-06-08 1988-06-08 Antennefod til flytbar antenne samt fremgangsmaade ved fremstilling heraf

Publications (2)

Publication Number Publication Date
EP0346315A2 true EP0346315A2 (de) 1989-12-13
EP0346315A3 EP0346315A3 (de) 1991-05-08

Family

ID=8119290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890850189 Withdrawn EP0346315A3 (de) 1988-06-08 1989-06-08 Fuss für eine bewegliche Antenne und Verfahren zu dessen Herstellung

Country Status (2)

Country Link
EP (1) EP0346315A3 (de)
DK (1) DK159746C (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561439A (en) * 1992-12-22 1996-10-01 Nokia Mobile Phones Limited Car phone antenna
JP2014197821A (ja) * 2013-03-29 2014-10-16 アンテナテクノロジー株式会社 アンテナ装置及びアンテナ取付け装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3977005A (en) * 1975-01-02 1976-08-24 Ward Products Corporation Antenna base assembly
JPS6040002Y2 (ja) * 1980-01-16 1985-12-02 敬助 岩田 車両用無線機のアンテナ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5561439A (en) * 1992-12-22 1996-10-01 Nokia Mobile Phones Limited Car phone antenna
JP2014197821A (ja) * 2013-03-29 2014-10-16 アンテナテクノロジー株式会社 アンテナ装置及びアンテナ取付け装置

Also Published As

Publication number Publication date
DK311788A (da) 1989-12-09
DK159746C (da) 1991-04-29
EP0346315A3 (de) 1991-05-08
DK311788D0 (da) 1988-06-08
DK159746B (da) 1990-11-26

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