EP0370715A2 - Antennenbefestigung mit einer Schraubkupplungsvorrichtung - Google Patents

Antennenbefestigung mit einer Schraubkupplungsvorrichtung Download PDF

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Publication number
EP0370715A2
EP0370715A2 EP89311967A EP89311967A EP0370715A2 EP 0370715 A2 EP0370715 A2 EP 0370715A2 EP 89311967 A EP89311967 A EP 89311967A EP 89311967 A EP89311967 A EP 89311967A EP 0370715 A2 EP0370715 A2 EP 0370715A2
Authority
EP
European Patent Office
Prior art keywords
helical
antenna
screw element
component
helical component
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.)
Granted
Application number
EP89311967A
Other languages
English (en)
French (fr)
Other versions
EP0370715A3 (de
EP0370715B1 (de
Inventor
Jiro Harada
Heizo Tsuchida
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.)
Harada Industry Co Ltd
Original Assignee
Harada Industry Co Ltd
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
Priority claimed from JP1988151909U external-priority patent/JPH0716896Y2/ja
Priority claimed from JP1989006212U external-priority patent/JP2517795Y2/ja
Priority claimed from JP1989006525U external-priority patent/JPH0713292Y2/ja
Application filed by Harada Industry Co Ltd filed Critical Harada Industry Co Ltd
Publication of EP0370715A2 publication Critical patent/EP0370715A2/de
Publication of EP0370715A3 publication Critical patent/EP0370715A3/de
Application granted granted Critical
Publication of EP0370715B1 publication Critical patent/EP0370715B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/088—Quick-releasable antenna elements
    • 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
    • H01Q1/1214—Supports; Mounting means for fastening a rigid aerial element through a wall

Definitions

  • the present invention relates to a device for coupling two elements by means of screw engagement of male and female elements and to an antenna installation device which utilizes such a coupling device.
  • Fig. 18 is a cross sectional view of a conventional antenna installation device removably fastening the lower end of a rod-form automobile antenna to the upper end of an attachment base installed in a vehicle body.
  • a rod-form automobile antenna element 1 (whip antenna element) is provided with a joint 2 at the lower end.
  • the joint 2 has a first screw element M provided integrally which has a male threaded part 3 formed on its outer surface by cutting or thread rolling.
  • a beveled area 4 is formed on the external surface of the joint 2 so as to facilitate the screwing in or unsecrew­ing of the antenna 1.
  • An attachment base 5 is made of an insulating mate­rial and is mounted on the vehicle body wall.
  • a female screw element N formed by cutting a female threaded part 6 (which can engage with the male threaded part 3) along the axis of a conductive part 7 is provided at the cen­ter of the attachment base 5.
  • the end portion of a ter­minal rod 8 which is used for connecting an antenna feeder line is inserted into the lower end of the con­ductive part 7.
  • the antenna element 1 is removably attached to the vehicle body wall by screwing the male screw element M of the joint 2 of the antenna element 1 into the female screw element N of the attachment base 5 in the direction indicated by the arrow in Fig. 18.
  • the male threaded part 3 of the male screw element M and the female threaded part 6 of the female screw element N are both formed by cutting or thread rolling using a tool such as a die or tap, etc.
  • a tool such as a die or tap, etc.
  • finishing precision is very high, rattling, etc., tends to occur, and it becomes very difficult to maintain sta­ble coupling.
  • loosening tends to occur as a result of vibration, etc., during operation of the automobile.
  • This type of antenna provides a single-length whip antenna which is manufactured at low cost while provid­ing excellent radio reception (which is a minimum requirement for such antennas).
  • This antenna consists of a single conductive rod which is more or less matched to a quarter (1/4) wavelength of the FM wave band. When installed, the antenna is exposed outside of the vehicle.
  • high tensile strength materials having a high recoil strength e.g., high tensile strength stain­less steel, etc. are used so that the antennas can withstand loads which may be applied by obstructions while the vehicle is in motion and during washing.
  • whip antenna When this type of whip antenna is mounted on a vehicle body in an assembly line, it occupies a large amount of dead space in the transport trucks used for transporting such vehicles. For this reason, the whip antenna is usually designed to be removable via screw coupling, etc., to an attachment base on the vehicle body.
  • the antenna employs the structure as shown in Fig. 19.
  • the joint 2 is fixed to the base end of the whip antenna element 1, and the male screw 3 attached to this joint 2 is screwed into the female screw 6 installed in the cou­pling part 5 of the attachment base 4.
  • the joint 2 is made of a material which has a tensile strength lower than the whip antenna element 1 in order to insure good workability, and when this material is used it must be thoroughly tested in view of its strength. Accordingly, there is a limit in terms of manufacturing costs.
  • a first object of the present inven­tion is to provide a screw type coupling device which makes it possible to form a male screw element and a female screw element of any desired size (in terms of thread dimensions, pitch, etc.) in a simple manner with­out any need for cutting, thus allowing the coupling device to be manufactured at a low cost.
  • a second object of the present invention is to pro­vide a screw type coupling device which provides a tight screw-connection, which is free of rattling, even where there is a Blight dimensional error or variation, etc. in the helical pitch, etc. of the respective helical components, thus making it possible to obtain an effect that is equivalent to the effect obtained by high-­precision screw finishing.
  • a third object of the present invention is 1 pro­vide a screw type coupling device in which there is no danger of any loosening of the screw-connected parts even though no special device to prevent such loosening is installed, so that even if the coupling device is subjected to vibrations, etc., there in no danger that the device will become unscrewed and thus allow one of the coupled parts to separate from the other and fall out.
  • a fourth object of the present invention is to pro­vide an antenna installation device equipped with a cou­pling device wherein a male screw element and a female screw element of the coupling device can be formed with­out performing cutting work thereto, so that the cou­pling device can be manufactured at a low cost, has a simple structure, and provides a stable coupling force.
  • a male screw element is formed by installing a coil spring form helical component on the outer circumference of a columnar base
  • a female screw element is formed by installing a coil spring form helical component (which is capable of screw engagement with the helical component of the male screw element) on the inner circumference of a tubular base, so that a screw type coupling device is obtained from the male screw element and the female screw element.
  • the helical component of the male screw element and the helical component of the female screw element described above are installed 80 that at least one end of each helical component is fixed to the base for the corresponding screw element, with the other end of the helical components remaining unfixed.
  • the dimensions of the respective parts are set so that when the male screw element is screwed into the female screw element, the outer-circumferential portions of the helical component of the male screw ele­ment are pressed against the inner-circumferential por­tions of the helical component of the female screw element, and (b) the inner circumferential surface of the tubular base of the female screw element is formed from a flexible material.
  • the screw type coupling device is inter­posed between the lower end of a rod-form automobile antenna element and the upper end of an attachment base (which is mounted on the vehicle body wall) as a coupl­ing means so that the lower end of the antenna element is coupled to the upper end of the attachment base, allowing the antenna to be removed.
  • the present invention provides the following effects:
  • the male screw element and female screw element can be formed by helical components with prescribed wire diameters. Consequently, these screw elements can be simply and easily formed without any need for laborious cutting. Thus, the screw type coupling device of this invention can be manufactured at a low cost.
  • Predetermined pressing forces act more positively in the area of the screw connection. Since expansion deformation of the helical component of the female screw element is forced the diameter thereof increase, and the female screw element is pressed against the inner circumferential surface of the tubular base part. Especially when the inner circumferential surface of the tubular base is formed from a flexible material, the female screw element may even bite into the inner cir­cumferential surface. Thus, even if no special device is provided to prevent loosening, etc., loosening will not occur, and even if the device is subjected to vibrations, there is no danger that the coupled parts will come unscrewed and fall out.
  • the antenna mounting device of the present inven­tion utilizes the above described coupling device in which the male and female screw elements thereof are formed without cutting work.
  • the coupling device can be manufactured at a low cost, has a simple structure, and provides stable coupling.
  • Fig. 1 shows a cross section of the structure of one embodiment of the present invention, where the invention is applied to an automobile antenna mounting assembly.
  • the antenna mounting assembly is designed so that the lower end of a rod-form automobile antenna element 11 is removably attached to the upper end of an attach­ment base 15 (which has been fastened to the vehicle body wall beforehand).
  • the antenna element 11 has an antenna installation cap 12 near the lower end.
  • a male screw element M is provided on the circumference of the (shank portion of the) antenna element 11 at a position below the antenna installation cap 12.
  • the male screw element M is formed as follows: A first helical component 13 is formed by coiling a stain­less steel wire, for example, with a prescribed wire diameter into the shape of a coil spring. The thus formed helical component 13 is mounted around the outer circumferential surface of the lower end area of the antenna element 11 which acts as a columnar base part. One end of the helical component 13 is fixed to the antenna element 11 by welding, etc.
  • a hexagonal surface 14 is formed on the outer sur­face of the antenna installation cap 12 in order to facilitate screwing in and unscrewing of the antenna element 11 using a tool such as a spanner, etc.
  • the attachment base 15 is made of an insulating material and has been fixed on the vehicle body wall beforehand.
  • a female screw element N is provided in this attachment base 15.
  • the female screw element N is formed basically as in the same manner as the male screw element M.
  • a second helical component 16 is formed by coiling a stainless steel wire material, for instance, with the same wire diameter and pitch as the first helical component 13, into the shape of a coil spring and is installed in a fastening cylinder 17 which acts as a tubular base.
  • the upper end portion 16a of the second helical component 16 is fixed to the inner circumferential surface of the fastening cylinder 17 so that the helical component 16 does not rotate, and the remainder of the helical component 16 is more or less free to move.
  • the lower end of the fastening cylinder 17 is covered by an end closure 18.
  • a hole is formed in the center of the e end closure 18, and the lower end 16b of the helical component 16 is led out through this hole.
  • the lower end 16b is able to function as a terminal rod for connecting an antenna feeder line thereto.
  • the male screw ele­ment M is screwed into the female screw element N installed in the attachment base 15 in the direction shown by the arrow in Fig. 1.
  • the first helical component 13 of the male screw element M is tightly screwed into the second helical component 16 of the female screw element N as shown in Fig. 2.
  • the male screw ele­ment M installed on the lower end of the antenna element 11 is unscrewed from the female screw element N by pull­ing the male screw element M (or antenna element 11) in a direction opposite to the arrow in Fig. 1.
  • the first helical component 13 of the male screw element M is unscrewed from the second helical component 16 of the female screw element N.
  • the rod-form automobile antenna element 11 can easily be mounted to and removed from the vehicle body.
  • the male screw element M and female screw element N are formed by respective hel­ical components 13 and 16.
  • the screw elements M and N can be formed easily without any need for the laborious cutting, etc., required in conventional devices. Accordingly, such a screw type coupling device which consists of the male screw element M and female screw element N can be manufactured at a low cost.
  • the wire diameters of the heli­cal components 13 and 16 can be set at any desired size regardless of the diameter or wall thickness, etc. of the antenna element 11 and the fastening cylinder 17.
  • Fig. 3 shows a cross section of a second embodi­ment of the present invention.
  • This embodiment differs from the first embodiment in the following two respects: First, the dimensions of the two screwing parts are set so that when the male screw element M is screwed into the female screw element N, the outer circumferential portions of the first helical component 13 of the male screw element M are pressed against the inner circum­ferential portions of the second helical component 16 of the female screw element N. Second, the inner circum­ferential surface of the attachment base 15′ for the female screw element N is formed from a flexible material, e.g., a soft synthetic resin, etc. According­ly, when the two helical components 13 and 16 are screwed together, they press against each other in a radial direction with the respective helical diameters D1 and D2 maintaining the relationship of: D1 ⁇ D2.
  • the size of the gap G is set as described below in order to insure that the pressing force between the facing surfaces acts reliably.
  • Fig. 4 shows the dimensions that are required in order for the helical components 13 and 16 to have the relationship shown in Fig. 3.
  • the pitch P of the first helical component 13 and the pitch P of the second helical com­ponent 16 must coincide in order for the two helical components 13 and 16 to overlap so that the two are shifted relative to each other in the radial direction.
  • dM is the wire diameter of the first helical component 13 and dN is the wire diameter of the second helical component 16: dM + dN > P > dM (or dN)
  • the gap G between the outside circumferential surface of the antenna element 11 (which acts as the columnar base part) and the inside circumferential surface of the attachment base 15′ is set at Gb which is slightly smaller than Ga (which is geometrically determined when the pitch P is set at a prescribed size in accordance with the wire diameters as described above).
  • Ga which is geometrically determined when the pitch P is set at a prescribed size in accordance with the wire diameters as described above.
  • this embodiment has the same effect as the first embodiment.
  • the coupled elements will not come unscrewed and the antenna element 11 will not fall out.
  • the wire diameter of the first helical component 13 and the wire diameter of the second helical component 16 are equal; however they can be different.
  • the wire diameter of the first helical component 13 can be smaller than the wire diameter of the second helical component 16 so that the two helical components are shifted relative to each other in a radial direction and overlap as in the embodiment of Fig. 2.
  • it is possible to set the helical pitch P of these two helical components 13 and 16 to be about the same as the wire diameter d of these helical components (P d) as shown in Fig. 7.
  • the male screw element M is screw-connected to the female screw element N so that the male screw element M is inside the female screw element N by P/2.
  • Fig. 9 shows a modified connection between the antenna 11 and the attachment base 15.
  • the first helical component 13 is provided away from the lower end of the antenna element 11, and the lower end 11a of the antenna element 11 (i.e., the portion not covered by the first helical component 13) is sup­ported by being tightly inserted into a narrow-diameter part 17a located at the lower end of the fastening cylinder 17 in the attachment base 15.
  • the male screw element M is formed by installing a coil spring form helical com­ponent 13 on the outer circumferential surface of the lower end portion of the antenna element 11, a highly rigid and highly elastic whip element material can be used "as is" as a coupling core.
  • a force which is able to withstand bending stress generated by external forces can be obtained from the whip antenna element itself.
  • the coupling strength is stronger than a conventional joint, and no bending or breaking would occur even if a large load is applied.
  • the upper portion of the helical component 13 is positioned inside the antenna installation cap 12, the space inside the cap 12 is filled by the helical compo­nent 13, thus reinforcing the antenna installation cap 12.
  • an upper end portion of the helical component 13 is positioned inside the antenna installation cap 12 so that the cap 12 is reinforced.
  • the helical component 13 can be installed as shown in Fig. 10 so that the helical component 13 is not covered by the skirt portion of the installation cap 12. It is also possible to use an installation cap 12′ which does not have an internal space as shown in Fig. 11.
  • the antenna installation cap 12 is in a skirt-like shape. However, it may have any shape which allows the use of a tightening tool.
  • a hole 20 can be made directly in the attachment base 15 as shown in Fig. 12. It would also be possible to mold the attach­ment base 15 from a material such as synthetic resin, etc. so that it tightly surrounds the circumference of the coiled helical component 16 as shown in Fig. 13, thus forming an attachment hole 20′ having partially embedded helical component 16 therein. Furthermore, as shown in Fig. 14, the male screw element M of the antenna 11 can be screwed into an ordinary female screw 16′ of a connecting assembly 21 which is fixed in the attachment base 15.
  • Fig. 15 is a round shape component.
  • a square shaped helical component such as that shown in Fig. 16.
  • a wire with a square cross section as shown in Fig. 17(b) or a wire with an elliptical cross section as shown in Fig. 17(c) can be used for the helical components instead of a wire with a circular cross section such as that shown in Fig. 17(a).
EP89311967A 1988-11-22 1989-11-20 Antennenbefestigung mit einer Schraubkupplungsvorrichtung Expired - Lifetime EP0370715B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
JP1988151909U JPH0716896Y2 (ja) 1988-11-22 1988-11-22 アンテナ取付け装置
JP151909/88 1988-11-22
JP6212/89 1989-01-23
JP1989006212U JP2517795Y2 (ja) 1989-01-23 1989-01-23 車載用ホイップアンテナ
JP6525/89 1989-01-25
JP1989006525U JPH0713292Y2 (ja) 1989-01-25 1989-01-25 車載用ホイップアンテナ取付けベース

Publications (3)

Publication Number Publication Date
EP0370715A2 true EP0370715A2 (de) 1990-05-30
EP0370715A3 EP0370715A3 (de) 1991-04-03
EP0370715B1 EP0370715B1 (de) 1996-06-12

Family

ID=27277060

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89311967A Expired - Lifetime EP0370715B1 (de) 1988-11-22 1989-11-20 Antennenbefestigung mit einer Schraubkupplungsvorrichtung

Country Status (3)

Country Link
EP (1) EP0370715B1 (de)
DE (1) DE68926655T2 (de)
ES (1) ES2090040T3 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380231A2 (de) * 1989-01-23 1990-08-01 Harada Industry Co., Ltd. Stabantenne für Fahrzeuge
EP0521746A1 (de) * 1991-07-02 1993-01-07 Mecaniplast Vorrichtung zur Befestigung einer Antenne, insbesondere für Autoradios an einen Antennenkörper
WO1993006631A1 (en) * 1991-09-23 1993-04-01 Allied-Signal, Inc. Adjustable helical antenna for a vhf radio
ES2037607A2 (es) * 1991-11-29 1993-06-16 Dik Plasticos Sa Base para antenas.
US5341149A (en) * 1991-03-25 1994-08-23 Nokia Mobile Phones Ltd. Antenna rod and procedure for manufacturing same
EP0736926A1 (de) * 1995-04-07 1996-10-09 Lk-Products Oy Wendelantenne und Herstellungsverfahren
EP0703636A3 (de) * 1994-09-21 1997-04-16 Hirschmann Richard Gmbh Co Fahrzeugantenne
EP0784353A1 (de) * 1996-01-09 1997-07-16 Mitsubishi Denki Kabushiki Kaisha Mobiles Endstellengerät zur Informationsübertragung
EP0889541A1 (de) * 1997-07-04 1999-01-07 France Telecom Wendelantenne mit variabler Länge
WO2001017060A1 (de) * 1999-08-31 2001-03-08 Robert Bosch Gmbh Biegsamer antennenstrahler
WO2007087964A1 (de) * 2006-02-04 2007-08-09 Hirschmann Car Communication Gmbh Antennenstab mit gewindeverbindung zum antennensockel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19859234A1 (de) * 1998-05-09 1999-11-11 Fischer Artur Werke Gmbh Abstandshalter

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB189421065A (en) * 1894-11-02 1895-09-28 Julius Boeddinghaus Method or Means for Fixing Screws to Stones or Walls.
US556082A (en) * 1896-03-10 Julius boeddinghaus
US809880A (en) * 1906-01-09 Tom Alfred Woolldridge Flexible coupling.
US1861532A (en) * 1932-01-14 1932-06-07 William S Hough Elevation post
US1966520A (en) * 1930-09-10 1934-07-17 Rayner John Art of threaded fastening
FR1074302A (fr) * 1953-04-03 1954-10-05 Dispositif de fixation d'antenne de t. s. f. pour véhicules automobiles
US3243755A (en) * 1964-03-16 1966-03-29 Gen Electric Electrical connector
US3820199A (en) * 1971-04-12 1974-06-28 Israel State Mechanical coupling means
US4536115A (en) * 1982-06-30 1985-08-20 Helderman J Frank Anchor apparatus for insertion into a pre-formed hole

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US556082A (en) * 1896-03-10 Julius boeddinghaus
US809880A (en) * 1906-01-09 Tom Alfred Woolldridge Flexible coupling.
GB189421065A (en) * 1894-11-02 1895-09-28 Julius Boeddinghaus Method or Means for Fixing Screws to Stones or Walls.
US1966520A (en) * 1930-09-10 1934-07-17 Rayner John Art of threaded fastening
US1861532A (en) * 1932-01-14 1932-06-07 William S Hough Elevation post
FR1074302A (fr) * 1953-04-03 1954-10-05 Dispositif de fixation d'antenne de t. s. f. pour véhicules automobiles
US3243755A (en) * 1964-03-16 1966-03-29 Gen Electric Electrical connector
US3820199A (en) * 1971-04-12 1974-06-28 Israel State Mechanical coupling means
US4536115A (en) * 1982-06-30 1985-08-20 Helderman J Frank Anchor apparatus for insertion into a pre-formed hole

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0380231A3 (de) * 1989-01-23 1991-03-27 Harada Industry Co., Ltd. Stabantenne für Fahrzeuge
EP0380231A2 (de) * 1989-01-23 1990-08-01 Harada Industry Co., Ltd. Stabantenne für Fahrzeuge
US5341149A (en) * 1991-03-25 1994-08-23 Nokia Mobile Phones Ltd. Antenna rod and procedure for manufacturing same
EP0521746A1 (de) * 1991-07-02 1993-01-07 Mecaniplast Vorrichtung zur Befestigung einer Antenne, insbesondere für Autoradios an einen Antennenkörper
FR2678689A1 (fr) * 1991-07-02 1993-01-08 Caillot Raymond Dispositif de fixation d'une antenne, notamment pour poste auto-radio, sur un corps d'antenne.
WO1993006631A1 (en) * 1991-09-23 1993-04-01 Allied-Signal, Inc. Adjustable helical antenna for a vhf radio
US5274393A (en) * 1991-09-23 1993-12-28 Allied-Signal Inc. Adjustable helical antenna for a VHF radio
ES2037607A2 (es) * 1991-11-29 1993-06-16 Dik Plasticos Sa Base para antenas.
EP0703636A3 (de) * 1994-09-21 1997-04-16 Hirschmann Richard Gmbh Co Fahrzeugantenne
EP0736926A1 (de) * 1995-04-07 1996-10-09 Lk-Products Oy Wendelantenne und Herstellungsverfahren
US5742259A (en) * 1995-04-07 1998-04-21 Lk-Products Oy Resilient antenna structure and a method to manufacture it
EP0784353A1 (de) * 1996-01-09 1997-07-16 Mitsubishi Denki Kabushiki Kaisha Mobiles Endstellengerät zur Informationsübertragung
US5739793A (en) * 1996-01-09 1998-04-14 Mitsubishi Denki Kabushiki Kaisha Mobile communication information terminal apparatus
EP0889541A1 (de) * 1997-07-04 1999-01-07 France Telecom Wendelantenne mit variabler Länge
FR2765732A1 (fr) * 1997-07-04 1999-01-08 France Telecom Antenne en helice variable
WO2001017060A1 (de) * 1999-08-31 2001-03-08 Robert Bosch Gmbh Biegsamer antennenstrahler
WO2007087964A1 (de) * 2006-02-04 2007-08-09 Hirschmann Car Communication Gmbh Antennenstab mit gewindeverbindung zum antennensockel

Also Published As

Publication number Publication date
EP0370715A3 (de) 1991-04-03
DE68926655T2 (de) 1996-12-05
EP0370715B1 (de) 1996-06-12
ES2090040T3 (es) 1996-10-16
DE68926655D1 (de) 1996-07-18

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