JP2004320519A

JP2004320519A - Nut and structure for antenna fitting

Info

Publication number: JP2004320519A
Application number: JP2003112716A
Authority: JP
Inventors: Hiroyasu Matsui; 宏康松井; Yukihisa Shimazu; 幸久島津
Original assignee: Nissan Motor Co Ltd
Current assignee: Nissan Motor Co Ltd
Priority date: 2003-04-17
Filing date: 2003-04-17
Publication date: 2004-11-11
Anticipated expiration: 2023-04-17
Also published as: JP4107143B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antenna fitting nut with which ground of an antenna can securely be conducted to a body to be fitted. <P>SOLUTION: The antenna fitting nut 4 is provided with a washer 5 positioned on an antenna main body 2-side, and a nut 6 screwed to a bolt part 3 of the antenna main body 2 through the washer part 5. The washer 5 is in an almost circular shape, and it has four first projecting parts 5a which are substantially arranged at equal intervals along an outer periphery. The first projecting parts 5a incline and project upward and outward, and tips have sharp shapes. The first projecting parts 5a of the washer 5 are pushed outward by contact pressure on a roof 1 in accordance with screwing of the nut 6 in the antenna fitting nut 4 to the bolt 3, and it tears off a coating layer 1b below the roof 1 so that it is scooped, and it passes through a metallic layer 1c. The antenna main body 2 to which the antenna element 2a is connected is fitted to the roof 1 of a vehicle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【０００１】
【技術分野】
本発明は、アンテナを被取付体に取り付けるアンテナ取付用ナット及びアンテナ取付構造に関し、特に車輌への車輌用アンテナの取付に用いて好ましいアンテナ取付用ナット及びアンテナ取付構造に関する。
【０００２】
【背景技術】
従来から、アンテナ本体から下方に突出するボルト部を、車輌のルーフに形成された貫通孔に挿入し、当該ボルト部にナットを螺合させることにより、車輌のルーフに車輌用アンテナを取り付ける車輌用アンテナ取付装置が知られている（例えば、特許文献１参照）。
【０００３】
また、このような車両用アンテナ取付装置において、アンテナ本体のボルト部とナット部との間に、上端に歯状部が形成されたワッシャ部を介在させて、アンテナ本体のボルト部にナットが螺合するに従い、その圧接力を利用してワッシャ部の歯状部を車輌のルーフに喰い込ませて、車輌のルーフに対するアンテナのアースを確保するものが知られている（例えば、特許文献２参照）。
【０００４】
しかしながら、この方法では、ボルト部とナット部との螺合時に生じる圧接力に伴う、車輌のルーフへの歯状部の喰い込みのみに頼っているため、当該歯状部が、車輌のルーフの塗膜層を十分に剥ぎ取り金属層まで貫通することが困難であり、ワッシャと被取付体との導通が不安定となり、アースが不確実となって雑音が誘起されるという問題があった。
【０００５】
【特許文献１】
特開平４−３３６３２５号公報
【特許文献２】
特開平８−２３７０１４号公報
【０００６】
【発明の開示】
本発明は、アンテナのアースを被取付体に確実に導通させることが可能なアンテナ取付用ナット及びアンテナ取付構造を提供することを目的とする。
【０００７】
上記目的を達成するために、本発明によれば、被取付体に形成された貫通孔に一方の側から挿入された、アンテナ本体から下方に突出するボルト部に、前記被取付体の他方の側から螺合して、前記アンテナ本体を前記被取付体に取り付けるためのアンテナ取付用ナットであって、前記被取付体に向かって傾斜して突出している第１の突出部を少なくとも有するワッシャ部と、前記アンテナ本体のボルト部に螺合するナット部とを少なくとも備えたアンテナ取付用ナットが提供される。
【０００８】
また、本発明によれば、被取付体に形成された貫通孔に一方の側から挿入された、アンテナ本体から下方に突出するボルト部に、前記被取付体の他方の側から螺合して、前記アンテナ本体を前記被取付体に取り付けるためのアンテナ取付用ナットであって、前記被取付体に向かって突出しており、前記被取付体の貫通孔の内壁面に接触する第２の突出部を少なくとも有するワッシャ部と、前記アンテナ本体のボルト部に螺合するナット部とを少なくとも備えたアンテナ取付用ナットが提供される。
【０００９】
本発明では、アンテナを被取付体に取り付けるためのアンテナ取付用ナット及びアンテナ取付構造において、アンテナ本体のボルト部と当該ボルト部に螺合するナット部との間に介在するワッシャ部に、前記被取付体に向かって傾斜して突出している第１の突出部を形成する。この第１の突出部が傾斜していることにより、被取付体へのアンテナの取付時において、ボルト部とナット部との螺合により生じる圧接力により、当該第１の突出部が押し広がって、被取付体の塗膜層を確実に剥ぎ取って被取付体の金属層まで貫通するので、アンテナのアースを被取付体に確実に導通させることが可能となる。
【００１０】
さらに、上記目的を達成するために、本発明によれば、被取付体にアンテナを取り付けるアンテナ取付構造であって、前記被取付体に形成された貫通孔に一方の側から挿入される、アンテナ本体から下方に突出するボルト部と、前記アンテナ本体のボルト部に、前記被取付体の他方の側から螺合するナット部と、前記被取付体に向かって傾斜して突出している第１の突出部を少なくとも有し、前記ナット部の上方に介装されるワッシャ部とを少なくとも備えたアンテナ取付構造が提供される。
【００１１】
また、発明によれば、被取付体にアンテナを取り付けるアンテナ取付構造であって、前記被取付体に形成された貫通孔に一方の側から挿入される、アンテナ本体から下方に突出するボルト部と、前記アンテナ本体のボルト部に、前記被取付体の他方の側から螺合するナット部と、前記被取付体に向かって突出しており、前記被取付体の貫通孔の内壁面に接触する第２の突出部を少なくとも有し、前記ナット部の上方に介装されるワッシャ部とを少なくとも備えたアンテナ取付構造が提供される。
【００１２】
本発明では、アンテナを被取付体に取り付けるためのアンテナ取付用ナット及びアンテナ取付構造において、アンテナ本体のボルト部と当該ボルト部に螺合するナット部との間に介在するワッシャ部に、前記被取付体に向かって突出しており、前記被取付体に形成された貫通孔の内壁面に接触する第２の突出部を形成する。この第２の突出部が被取付体の貫通孔の内壁面に接触することにより、被取付体へのアンテナの取付時において、ボルト部とナット部との螺合に従い、当該第２の突出部が、被取付体の貫通孔の内壁面の塗膜層を削り取って被取付体の金属層まで貫通するので、アンテナのアースを被取付体に確実に導通させることが可能となる。
【００１３】
【発明の実施の形態】
以下、本発明の実施形態を図面に基づいて説明する。
【００１４】
［第１実施形態］
図１は本発明の第１実施形態に係るルーフに取り付けられたアンテナ本体及びアンテナ取付用ナットの概略図及び第１の突出部の要部断面図、図２（Ａ）は本発明の第１実施形態に係るアンテナ取付用ナットの平面図、図２（Ｂ）は図２（Ａ）のＩＩＢ−ＩＩＢ線に沿う断面図、図３（Ａ）は本発明の第１実施形態に係るアンテナ取付用ナットのワッシャ部の平面図、図３（Ｂ）は図３（Ａ）のＩＩＩＢ−ＩＩＩＢ線に沿う断面図、図４（Ａ）は本発明の第１実施形態に係るアンテナ取付用ナットのナット部の平面図、図４（Ｂ）は図４（Ａ）のＩＶＢ−ＩＶＢ線に沿う断面図、図５（Ａ）は本発明の第１実施形態に係るアンテナ本体のボルト部の平面図、図５（Ｂ）は図５（Ａ）のＶＢ−ＶＢ線に沿う断面図、図６は本発明の第１実施形態に係るアンテナ本体のボルト部へのアンテナ取付用ナットの仮止めの方法を示す図であり、図６（Ａ）は仮止め前の状態を示し、図６（Ｂ）は仮止め後の状態を示す。
【００１５】
図１に示すように、本発明の第１実施形態に係るアンテナ取付用ナット４は、例えば、電話帯、ＦＭ帯及びＡＭ帯などを受信可能なアンテナ素子２ａが連結され、アンプ、分波器、合波器等を内蔵しているアンテナ本体２を、例えば自動車等の車輌のルーフ１などに取り付けるために用いられるものであり、具体的には、ルーフ１に予め形成された取付用貫通孔１ａに挿入された、アンテナ本体２から下方に突出しているボルト部３に当該アンテナ取付用ナット４が螺合されることにより、アンテナ本体２がルーフ１に取り付けられる。
【００１６】
このアンテナ取付用ナット４は、図２（Ａ）及び図２（Ｂ）に示すように、上方に、即ちアンテナ本体２側に位置するワッシャ部５と、当該ワッシャ部５を介装させてアンテナ本体２のボルト部３に螺合するナット部６とを有している。
【００１７】
このアンテナ取付用ナット４のワッシャ部５は、図３（Ａ）及び（Ｂ）に示すように、例えば金属等から成る略環状形状のワッシャであり、その外周に沿って実質的に等間隔に配置された４つの第１の突出部５ａを有している。この各第１の突出部５ａは、図３（Ｂ）に示すように、ルーフ１に向かうように上方に、且つ、外側に傾斜して突出しており、その先端が鋭利な形状を有している。さらに、このワッシャ部５は、後述するボルト部３が挿通可能な内径を持つ貫通孔５ｃを有している。そして、この貫通孔５ｃの周縁には、当該ワッシャ部５の下方に伸びている３つのリブ５ｅが実質的に等間隔に配置されていると共に、アンテナ本体２のボルト部３との仮止めのために、図３（Ｂ）に示すような、中心側の壁面が広がるように傾斜している形状を有する第１の仮止用係合部５ｆが中心に向かって形成されている。各リブ５ｅの先端部には、後述するナット部６の溝６ｃと係合するために突起が形成されている。
【００１８】
このアンテナ取付用ナット４のナット部６は、図４に示すように、例えば金属等から成る略環状形状のナットであり、アンテナ本体２のボルト部３が挿入可能な内径の貫通孔６ｂを有しており、当該貫通孔６ｂの上方の内周面には、上述のワッシャ部５の各リブ５ｅが係合するための全周に亘って継がっている環状の溝６ｃが形成されていると共に、その下方の内周面には、後述するボルト部３の外周面に雄ネジ部３ａと螺合する雌ネジ部６ａが形成されている。
【００１９】
このようなワッシャ部５とナット部６とから構成されるアンテナ取付用ナット４は、まず、ワッシャ部５の各リブ５ｅが、ナット部６の貫通孔６ｂの上方に挿入され、さらに圧入されることにより、図２（Ａ）及び図２（Ｂ）に示すように、ワッシャ部５の各リブ５ｅが弾性変形してナット部６の溝６ｃに係合し、ワッシャ部５がナット部６に回動自在に保持されて、当該アンテナ取付用ナット４が構成されている。なお、ワッシャ部５の各リブ５ｅの先端に突起を形成せずに、ワッシャ部５の各リブ５ｅをナット部６の貫通孔６ｂに挿入後に、当該各リブ５ｅを溝６ｃに対して外側に向かって拡径して、ワッシャ部５をナット部６が回動自在に保持するようにしても良い。
【００２０】
次に、アンテナ本体２のボルト部３について説明する。このアンテナ本体２のボルト部３は、図１に示すように、当該アンテナ本体２から下方に突出している。このボルト部３は、図５（Ａ）及び図５（Ｂ）に示すように、略円筒形状を有しており、アンテナ取付用ナット４のナット部６の雌ネジ部６ａと螺合する雄ネジ部３ａがその外周面に形成されている共に、その内部には内孔３ｃが形成されている。そして、このボルト部３の下端部には、アンテナ取付用ナット４の仮止めのための、中心側の壁面が広がるように傾斜している形状を有する第２の仮止用係合部３ｄが内孔３ｃの中心に向かって突出している。また、このボルト部３の側面には、ワッシャ部５の貫通孔５ｃに当該ボルト部３が挿入された際に、ワッシャ部５の第１の仮止用係合部５ｆとの干渉を回避するために、当該第１の仮止用係合部５ｆの幅より若干幅広なスリット３ｂが長手方向に沿って形成されている。
【００２１】
次に、本発明の第１実施形態に係るアンテナ取付用ナットを用いてアンテナ本体を自動車のルーフに取り付ける方法について説明する。
【００２２】
まず、自動車のルーフ１に予め形成されている、ボルト部３の外径より若干大きな外径の取付用貫通孔１ａに、アンテナ本体２から下方に突出しているボルト部３を上方から挿入する。
【００２３】
次に、図６（Ａ）に示すように、ナット部６に回動自在に保持されたワッシャ部５の第１の仮止用係合部５ｆをボルト部３のスリット３ｂに合わせながら、ルーフ１の取付用貫通孔１ａに挿入されたボルト部３に、自動車のルーフ１の下方からアンテナ取付用ナット４のワッシャ部５及びナット部６の貫通孔５ｃ、６ｂを挿入し、アンテナ取付用ナット４のワッシャ部５の第１の仮止用係合部５ｆを、ボルト部３の第２の仮止用係合部３ｄに当接させる。
【００２４】
次に、図６（Ｂ）に示すように、ボルト部３に対して、アンテナ取付用ナット４をさらに挿入・押圧し、ワッシャ部５及びボルト部３の第１及び第２の仮止用係合部５ｆ、３ｄを相互に弾性変形させ、図６（Ｂ）に示すように、ワッシャ部５の第１の仮止用係合部５ｆがボルト部３の第２の仮止用係合部３ｄより上方に位置するように、ワッシャ部５の第１の仮止用係合部５ｆとボルト部３の第２の仮止用係合部３ｄとを係合させ、ボルト部３にアンテナ取付用ナット４を仮止めする。
【００２５】
次に、ボルト部３に対してナット部６を回転させて、ボルト部３の雄ネジ部３ａにナット部６の雌ネジ部６ａを螺合させる。なお、ワッシャ部５はナット部６に対して回動自在となっており、且つ、ワッシャ部５の第１の仮止用係合部５ｆがボルト部３のスリット３ｂにより規制されているため、ワッシャ部５がナット部６と共に回転することはない。
【００２６】
そして、このボルト部３の雄ネジ部３ａとナット部６の雌ネジ部６ａとの螺合により生じるルーフ１に対する圧接力により、図１の要部断面図に示すように、ワッシャ部５の外側に傾斜して突出している各第１の突出部５ａが押し広がり、自動車のルーフ１の下側の塗膜層１ｂを剔るように剥がし取って金属層１ｃまで貫通する。
【００２７】
このように、アンテナ取付用ナットのワッシャ部に被取付体に向かって傾斜して突出している第１の突出部を設け、アンテナ取付時に生じる圧接力により、当該第１の突出部が押し広がり、被取付体である自動車のルーフの塗膜層を剥ぎ取り、当該第１の突出部を金属層まで貫通させることで、アンテナのアースを被取付体に確実に導通させることが可能となる。
【００２８】
また、アンテナ取付時において、アンテナ取付用ナットの落下を防止するために、仮止め用の樹脂部品等を追加して落下防止機構を設けるのが一般的であるが、本実施形態におけるアンテナ取付用ナット及びアンテナ取付構造では、上記のアンテナのアースを確実に確保することに加え、ワッシャ部の内周及びボルト部の内孔に突出し、相互に係合可能な第１及び第２の仮止用係合部をそれぞれ設け、アンテナ取付時にこれらを係合させることにより、仮止めのために上記のような樹脂部品の追加等の部品点数を増やすことなく、従来と同様の方法によりボルト部の下方からアンテナ取付用ナットを挿入するだけでアンテナ取付用ナットを仮止めすることが可能となる。
【００２９】
［第２実施形態］
図７は本発明の第２実施形態に係るルーフに取り付けられたアンテナ本体及びアンテナ取付用ナットの概略図及び第２の突出部の要部断面図、図８（Ａ）は本発明の第２実施形態に係るアンテナ取付用ナットの平面図、図８（Ｂ）は図８（Ａ）のＶＩＩＩＢ−ＶＩＩＩＢ線に沿う断面図、図９（Ａ）は本発明の第２実施形態に係るアンテナ取付用ナットのワッシャ部の平面図、図９（Ｂ）は図９（Ａ）のＩＸＢ−ＩＸＢ線に沿う断面図である。
【００３０】
本発明の第２実施形態においては、図７に示すように、アンテナ素子２ａ、アンテナ本体２、ボルト部３及びナット部６は、第１実施形態と同様の構造である。
【００３１】
本実施形態に係るアンテナ取付用ナット４のワッシャ部５は、図９（Ａ）及び図９（Ｂ）に示すように、例えば金属等から成る略環状形状のワッシャであり、その外周に沿って実質的に等間隔に配置された４つの歯状部５ｄを有している。この各歯状部５ｄは、図９（Ｂ）に示すように、第１実施形態における第１の突出部５ａと異なり、外側に傾斜せず、上方に向かってのみ突出している。
【００３２】
さらに、このワッシャ部５は、ボルト部３が挿通可能な内径を持つ貫通孔５ｃを有すると共に、上方に突出している４つの第２の突出部５ｂが、当該貫通孔５ｃの周縁に沿って実質的に等間隔に配置されている。この各第２の突出部５ｂは、図９（Ｂ）に示すように、その内周側の面が径方向に対して直立しているのに対し、その外周側の面が内周側に向かって傾斜しているような形状を有している。
【００３３】
より具体的には、この各第２の突出部５ｂは、ワッシャ部５の外周に沿って形成された歯状部５ｄより上方に高く伸びており、その外周側の面の上端部が、ルーフ１に形成された取付用貫通孔１ａの内径より小さな外径となるように配置されている。そして、当該第１の突出部５ｂの外周側の面は、下方に向かって広がっており、取付用貫通孔１ａの内径より大きな外径となるように配置されている。このため、アンテナ取付時において、ワッシャ部５の各第２の突出部５ｂの外周面の上端部が取付用貫通孔１ａに入り込み、ボルト部３とナット部６の螺合に従って、当該外周面が取付用貫通孔１ａを押し広げるようになっている。
【００３４】
また、このワッシャ部５は、第１実施形態と同様に、下方に伸びており、先端に突起が形成された３つのリブ５ｅが貫通孔５ｃの周縁に沿って実質的に等間隔に配置されていると共に、図９（Ｂ）に示すような、中心側の壁面が広がるように傾斜している形状を有する第２の仮止用係合部５ｆが中心に向かって形成されている。
【００３５】
このようなワッシャ部５の各リブ５ｅが、ナット部６の貫通孔６ｂの上方に挿入され、さらに圧入されることにより、図８（Ａ）及び図８（Ｂ）に示すように、ワッシャ部５の各リブ５ｅが弾性変形してナット部６の溝６ｃに係合し、ワッシャ部５がナット部６に回動自在に保持されて、アンテナ取付用ナット４が構成されている。
【００３６】
次に、本発明の第２実施形態に係るアンテナ取付用ナットを用いてアンテナ本体を自動車のルーフに取り付ける方法について説明する。
【００３７】
第１実施形態と同様に、まず、アンテナ本体２のボルト部３をルーフ１の取付用貫通孔１ａに上方から挿入し、ナット部６に回動自在に保持されたワッシャ部５の第１の仮止用係合部５ｆをボルト部３のスリット３ｂに合わせながら、当該ボルト部３にナット部６を挿入し、アンテナ取付用ナット４のワッシャ部５の第１の仮止用係合部５ｆを、ボルト部３の第２の仮止用係合部３ｄに当接させる。アンテナ取付用ナット４をさらに挿入・押圧すると、第１及び第２の仮止用係合部５ｆ、３ｄが相互に弾性変形し、ワッシャ部５の第１の仮止用係合部５ｆとボルト部３の第２の仮止用係合部３ｄとが係合し、ボルト部３にアンテナ取付用ナット４が仮止めされる。次に、ボルト部３に対してナット部６を回転させて螺合させると、この螺合により生じるルーフ１に対する圧接力により、図７の要部断面図に示すように、ワッシャ部５の内周に配置された各第２の突出部５ｂが、ルーフ１の取付用貫通孔１ａを押し広げて入り込み、当該取付用貫通孔１ａの内壁面の塗膜層１ｂを削る取って露出させ、各第２の突出部５ｂがルーフ１の金属層１ｃに接触する。
【００３８】
このように、アンテナ取付用ナットのワッシャ部に被取付体に向かって突出しており、被取付体に形成された内壁面に接触する第２の突出部を設け、アンテナ取付時に生じる圧接力により、当該第２の突出部が被取付体の貫通孔を押し広げ、塗膜層を削り取って、当該第２の突出部を金属層に接触させることで、アンテナのアースを被取付体に確実に導通させることが可能となる。
【００３９】
また、本実施形態におけるアンテナ取付用ナット及びアンテナ取付構造では、第１実施形態と同様に、上記のアンテナのアースを確実に確保することに加え、ワッシャ部の内周及びボルト部の内孔に突出し、相互に係合可能な第１及び第２の仮止用係合部をそれぞれ設け、アンテナ取付時にこれらを係合させることにより、仮止めのために樹脂部品の追加等の部品点数を増やすことなく、従来と同様の方法によりボルト部の下方からアンテナ取付用ナットを挿入するだけでアンテナ取付用ナットを仮止めすることが可能となる。
【００４０】
なお、以上説明した実施形態は、本発明の理解を容易にするために記載されたものであって、本発明を限定するために記載されたものではない。したがって、上記の実施形態に開示された各要素は、本発明の技術的範囲に属する全ての設計変更や均等物をも含む趣旨である。例えば、第１実施形態のワッシャ部に、第２実施形態において説明した第２の突出部を設けることにより、より確実にアンテナのアースを確保しても良い。また、例えば、上述の第１及び第２実施形態においては、第１及び第２の突出部をワッシャ部の外周及び内周に沿って実質的に等間隔にいずれも４つ設けるものとして説明したが、本発明においては特にこれに限定されず、任意の数の第１及び第２の突出部をワッシャ部に任意に配置することが可能である。同様に、上述の第１及び第２実施形態においては、下方に突出する３つのリブをワッシャ部の内周に沿って実質的に等間隔に配置するように説明したが、本発明においては特にこれに限定されず、任意の数のリブを任意に配置することが可能である。
【図面の簡単な説明】
【図１】図１は、本発明の第１実施形態に係るルーフに取り付けられたアンテナ本体及びアンテナ取付用ナットの概略図及び第１の突出部の要部断面図である。
【図２】図２（Ａ）は、本発明の第１実施形態に係るアンテナ取付用ナットの平面図であり、図２（Ｂ）は、図２（Ａ）のＩＩＢ−ＩＩＢ線に沿う断面図である。
【図３】図３（Ａ）は、本発明の第１実施形態に係るアンテナ取付用ナットのワッシャ部の平面図であり、図３（Ｂ）は、図３（Ａ）のＩＩＩＢ−ＩＩＩＢ線に沿う断面図である。
【図４】図４（Ａ）は、本発明の第１実施形態に係るアンテナ取付用ナットのナット部の平面図であり、図４（Ｂ）は、図４（Ａ）のＩＶＢ−ＩＶＢ線に沿う断面図である。
【図５】図５（Ａ）は、本発明の第１実施形態に係るアンテナ本体のボルト部の平面図であり、図５（Ｂ）は、図５（Ａ）のＶＢ−ＶＢ線に沿う断面図である。
【図６】図６は、本発明の第１実施形態に係るアンテナ本体のボルト部へのアンテナ用取付ナットの仮止めの方法を示す図であり、図６（Ａ）は仮止め前の状態を示し、６（Ｂ）は仮止め後の状態を示す。
【図７】図７は、本発明の第２実施形態に係るルーフに取り付けられたアンテナ本体及びアンテナ取付用ナットの概略図及び第２の突出部の要部断面図である。
【図８】図８（Ａ）は、本発明の第２実施形態に係るアンテナ取付用ナットの平面図であり、図８（Ｂ）は、図８（Ａ）のＶＩＩＩＢ−ＶＩＩＩＢ線に沿う断面図である。
【図９】図９（Ａ）は、本発明の第２実施形態に係るアンテナ取付用ナットのワッシャ部の平面図であり、図９（Ｂ）は、図９（Ａ）のＩＸＢ−ＩＸＢ線に沿う断面図である。
【符号の説明】
１…ルーフ
１ａ…取付用貫通孔
１ｂ…塗膜層
１ｃ…金属層
２…アンテナ本体
２ａ…アンテナ素子
３…ボルト部
３ａ…雄ネジ部
３ｂ…スリット
３ｃ…内孔
３ｄ…第２の仮止用係合部
４…アンテナ取付用ナット
５…ワッシャ部
５ａ…第１の突出部
５ｂ…第２の突出部
５ｃ…貫通孔
５ｄ…歯状部
５ｅ…リブ
５ｆ…第１の仮止用係合部
６…ナット部
６ａ…雌ネジ部
６ｂ…貫通孔
６ｃ…溝[0001]
【Technical field】
The present invention relates to an antenna mounting nut and an antenna mounting structure for mounting an antenna to an object to be mounted, and more particularly to an antenna mounting nut and an antenna mounting structure that are preferably used for mounting a vehicle antenna on a vehicle.
[0002]
[Background Art]
Conventionally, a bolt portion projecting downward from an antenna body is inserted into a through hole formed in a roof of a vehicle, and a nut is screwed into the bolt portion to mount a vehicle antenna on the roof of the vehicle. BACKGROUND ART An antenna mounting device is known (for example, see Patent Document 1).
[0003]
Further, in such a vehicle antenna mounting device, a nut is screwed into the bolt portion of the antenna body with a washer portion having a toothed portion formed at the upper end interposed between the bolt portion and the nut portion of the antenna body. There is known a method in which a toothed portion of a washer portion is made to bite into a vehicle roof by using the pressure contact force as a result, thereby securing an antenna ground to the vehicle roof (for example, see Patent Document 2). ).
[0004]
However, according to this method, since only the biting of the tooth portion into the roof of the vehicle due to the press-contact force generated when the bolt portion and the nut portion are screwed together, the tooth portion is formed on the roof of the vehicle. It is difficult to sufficiently peel off the coating layer and penetrate to the metal layer, so that the conduction between the washer and the attached body becomes unstable, the ground becomes uncertain and noise is induced.
[0005]
[Patent Document 1]
JP-A-4-336325 [Patent Document 2]
JP-A-8-237014
DISCLOSURE OF THE INVENTION
SUMMARY OF THE INVENTION An object of the present invention is to provide an antenna mounting nut and an antenna mounting structure capable of reliably conducting the ground of an antenna to a body to be mounted.
[0007]
In order to achieve the above object, according to the present invention, a bolt portion inserted from one side into a through hole formed in an attached body and projecting downward from an antenna main body is provided with another bolt of the attached body. An antenna mounting nut screwed from a side for mounting the antenna main body to the mounted body, wherein the washer part has at least a first protruding portion inclined and protruded toward the mounted body; And a nut for screwing the antenna body with a bolt part of the antenna body.
[0008]
Further, according to the present invention, the bolt is inserted from one side into a through hole formed in the attached body, and is screwed from the other side of the attached body to a bolt portion projecting downward from the antenna body. An antenna mounting nut for mounting the antenna main body to the mounted body, the second protrusion protruding toward the mounted body and contacting an inner wall surface of a through hole of the mounted body; And a nut for screwing the antenna body with a bolt portion of the antenna body.
[0009]
In the present invention, in the antenna mounting nut and the antenna mounting structure for mounting the antenna to the mounted body, the washer is interposed between a bolt portion of the antenna body and a nut portion screwed to the bolt portion. A first projecting portion is formed to project obliquely toward the mounting body. Since the first protruding portion is inclined, the first protruding portion is pushed and spread by the press-contact force generated by screwing the bolt portion and the nut portion when the antenna is mounted on the body to be mounted. Since the coating layer of the object is reliably peeled off and penetrated to the metal layer of the object, the ground of the antenna can be reliably conducted to the object.
[0010]
In order to achieve the above object, according to the present invention, there is provided an antenna mounting structure for mounting an antenna on a mounted body, wherein the antenna is inserted from one side into a through hole formed in the mounted body. A bolt protruding downward from the body, a nut threadedly engaged with the bolt of the antenna body from the other side of the attached body, and a first projecting obliquely toward the attached body. An antenna mounting structure having at least a protruding part and a washer part interposed above the nut part is provided.
[0011]
Further, according to the invention, there is provided an antenna mounting structure for mounting an antenna to a mounted body, wherein a bolt portion that is inserted from one side into a through hole formed in the mounted body and protrudes downward from the antenna body. A nut portion screwed into the bolt portion of the antenna main body from the other side of the mounted body, and a nut projecting toward the mounted body and in contact with an inner wall surface of a through hole of the mounted body. An antenna mounting structure is provided that has at least two projecting portions and at least a washer portion interposed above the nut portion.
[0012]
In the present invention, in the antenna mounting nut and the antenna mounting structure for mounting the antenna to the mounted body, the washer is interposed between a bolt portion of the antenna body and a nut portion screwed to the bolt portion. A second protruding portion that protrudes toward the mounting body and contacts an inner wall surface of a through hole formed in the mounting body is formed. When the second protrusion comes into contact with the inner wall surface of the through-hole of the body to be mounted, the second protrusion follows the screwing of the bolt and the nut when the antenna is mounted on the body to be mounted. However, since the coating layer on the inner wall surface of the through hole of the attached body is scraped and penetrated to the metal layer of the attached body, it is possible to reliably connect the ground of the antenna to the attached body.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0014]
[First Embodiment]
FIG. 1 is a schematic diagram of an antenna main body and an antenna mounting nut mounted on a roof according to a first embodiment of the present invention, and a cross-sectional view of a main part of a first protruding portion. FIG. FIG. 2B is a plan view of an antenna mounting nut according to the embodiment, FIG. 2B is a cross-sectional view taken along line IIB-IIB of FIG. 2A, and FIG. 3A is an antenna mounting according to the first embodiment of the present invention. FIG. 3B is a cross-sectional view taken along the line IIIB-IIIB of FIG. 3A, and FIG. 4A is a plan view of the antenna mounting nut according to the first embodiment of the present invention. FIG. 4B is a sectional view taken along the line IVB-IVB of FIG. 4A, and FIG. 5A is a plan view of a bolt part of the antenna body according to the first embodiment of the present invention. FIG. 5B is a sectional view taken along line VB-VB of FIG. 5A, and FIG. 6 is a first embodiment of the present invention. It is a figure which shows the method of temporarily fixing the antenna mounting nut to the bolt part of such an antenna main body, FIG.6 (A) shows the state before temporary fixing, FIG.6 (B) shows the state after temporary fixing. .
[0015]
As shown in FIG. 1, an antenna mounting nut 4 according to a first embodiment of the present invention is connected to an antenna element 2a capable of receiving, for example, a telephone band, an FM band, and an AM band, and includes an amplifier, a duplexer, and the like. , For example, for mounting an antenna body 2 containing a multiplexer or the like to a roof 1 of a vehicle such as an automobile, and more specifically, a mounting through hole formed in the roof 1 in advance. The antenna main body 2 is mounted on the roof 1 by screwing the antenna mounting nut 4 into a bolt portion 3 inserted into 1 a and protruding downward from the antenna main body 2.
[0016]
As shown in FIGS. 2 (A) and 2 (B), the antenna mounting nut 4 is provided with a washer portion 5 located upward, that is, on the side of the antenna body 2, and an antenna with the washer portion 5 interposed therebetween. And a nut 6 screwed to the bolt 3 of the main body 2.
[0017]
As shown in FIGS. 3A and 3B, the washer portion 5 of the antenna mounting nut 4 is a substantially annular washer made of, for example, a metal, and is disposed at substantially regular intervals along the outer periphery. It has four first projections 5a arranged. As shown in FIG. 3 (B), each of the first protrusions 5a protrudes upward and outward toward the roof 1 and has a sharp tip. I have. Further, the washer portion 5 has a through hole 5c having an inner diameter through which a bolt portion 3 described later can be inserted. At the periphery of the through hole 5c, three ribs 5e extending below the washer portion 5 are arranged at substantially equal intervals, and are temporarily fixed to the bolt portion 3 of the antenna main body 2. For this purpose, as shown in FIG. 3B, a first temporary fixing engaging portion 5f having a shape inclined so that the wall surface on the center side is widened is formed toward the center. A projection is formed at the tip of each rib 5e to engage with a groove 6c of a nut 6 described later.
[0018]
As shown in FIG. 4, the nut 6 of the antenna mounting nut 4 is a substantially annular nut made of, for example, metal, and has a through hole 6 b having an inner diameter into which the bolt 3 of the antenna body 2 can be inserted. An annular groove 6c is formed on the inner peripheral surface above the through-hole 6b so as to be engaged with the entire circumference for the engagement of each rib 5e of the washer portion 5 described above. At the same time, a female screw portion 6a which is screwed to the male screw portion 3a is formed on an inner peripheral surface below the outer peripheral surface of the bolt portion 3 described later.
[0019]
In the antenna mounting nut 4 including the washer portion 5 and the nut portion 6, first, each rib 5 e of the washer portion 5 is inserted above the through hole 6 b of the nut portion 6 and further press-fitted. Thereby, as shown in FIGS. 2A and 2B, each rib 5e of the washer portion 5 is elastically deformed and engages with the groove 6c of the nut portion 6, so that the washer portion 5 The antenna mounting nut 4 is held so as to be rotatable. After inserting each rib 5e of the washer portion 5 into the through hole 6b of the nut portion 6 without forming a projection at the tip of each rib 5e of the washer portion 5, the rib 5e is moved outward with respect to the groove 6c. The diameter may be increased so that the washer 5 is rotatably held by the nut 6.
[0020]
Next, the bolt 3 of the antenna body 2 will be described. The bolt 3 of the antenna body 2 projects downward from the antenna body 2 as shown in FIG. As shown in FIGS. 5A and 5B, the bolt portion 3 has a substantially cylindrical shape, and is a male screw that engages with the female screw portion 6a of the nut portion 6 of the antenna mounting nut 4. A screw portion 3a is formed on the outer peripheral surface, and an inner hole 3c is formed therein. At the lower end of the bolt portion 3, a second temporary fixing engaging portion 3d having a shape inclined so that a wall surface on the center side is widened for temporary fixing of the antenna mounting nut 4 is provided. It protrudes toward the center of the inner hole 3c. In addition, when the bolt 3 is inserted into the through hole 5c of the washer 5 on the side surface of the bolt 3, interference with the first temporary engaging portion 5f of the washer 5 is avoided. Therefore, a slit 3b slightly wider than the width of the first temporary engaging portion 5f is formed along the longitudinal direction.
[0021]
Next, a method for attaching the antenna body to the roof of the automobile using the antenna attachment nut according to the first embodiment of the present invention will be described.
[0022]
First, a bolt portion 3 projecting downward from the antenna body 2 is inserted from above into a mounting through hole 1a having an outer diameter slightly larger than the outer diameter of the bolt portion 3 formed in advance on the roof 1 of the automobile.
[0023]
Next, as shown in FIG. 6A, the first temporary engaging portion 5 f of the washer portion 5 rotatably held by the nut portion 6 is aligned with the slit 3 b of the bolt portion 3, and 1, the washer portion 5 of the antenna mounting nut 4 and the through holes 5c and 6b of the nut portion 6 are inserted from below the roof 1 of the vehicle into the bolt portion 3 inserted into the mounting through hole 1a. The first temporary engaging portion 5f of the washer portion 4 is brought into contact with the second temporary engaging portion 3d of the bolt portion 3.
[0024]
Next, as shown in FIG. 6B, the antenna mounting nut 4 is further inserted and pressed into the bolt portion 3, and the first and second temporary fastening members of the washer portion 5 and the bolt portion 3 are pressed. The joints 5f and 3d are elastically deformed to each other, and as shown in FIG. 6 (B), the first temporary engaging portion 5f of the washer portion 5 becomes the second temporary engaging portion of the bolt portion 3. The first temporary fixing engaging portion 5f of the washer portion 5 and the second temporary fixing engaging portion 3d of the bolt portion 3 are engaged with each other so as to be located above 3d, and the antenna is attached to the bolt portion 3. Temporarily fix the nut 4 for use.
[0025]
Next, the nut part 6 is rotated with respect to the bolt part 3, and the female screw part 6a of the nut part 6 is screwed with the male screw part 3a of the bolt part 3. Since the washer portion 5 is rotatable with respect to the nut portion 6 and the first temporary fixing engagement portion 5f of the washer portion 5 is regulated by the slit 3b of the bolt portion 3, The washer portion 5 does not rotate with the nut portion 6.
[0026]
Then, as shown in the sectional view of the main part of FIG. 1, the outer side of the washer 5 is pressed by the pressing force against the roof 1 caused by the screwing of the male screw 3a of the bolt 3 and the female screw 6a of the nut 6. The first projecting portions 5a projecting obliquely are spread apart, peeled off so as to cut off the lower coating layer 1b of the roof 1 of the automobile, and penetrate to the metal layer 1c.
[0027]
As described above, the first protrusion that is inclined and protrudes toward the body to be mounted is provided on the washer portion of the antenna mounting nut, and the first protrusion is pushed and spread by the pressure contact force generated when the antenna is mounted. By peeling off the coating layer of the roof of the automobile as the attached body and penetrating the first protrusion to the metal layer, it is possible to reliably conduct the ground of the antenna to the attached body.
[0028]
In addition, at the time of mounting the antenna, in order to prevent the antenna mounting nut from dropping, it is general to provide a fall prevention mechanism by adding a temporary fixing resin component or the like. In the nut and antenna mounting structure, in addition to ensuring the grounding of the antenna, the first and second temporary fixing portions that protrude from the inner periphery of the washer portion and the inner hole of the bolt portion and can be engaged with each other are provided. By providing engaging portions and engaging them at the time of mounting the antenna, the number of parts such as the addition of resin parts as described above for temporary fixing is increased, and the lower portion of the bolt portion is formed in the same manner as in the related art. The antenna mounting nut can be temporarily fixed only by inserting the antenna mounting nut from the above.
[0029]
[Second embodiment]
FIG. 7 is a schematic view of an antenna main body and an antenna mounting nut mounted on a roof according to a second embodiment of the present invention, and a cross-sectional view of a main part of a second projecting portion. FIG. FIG. 8B is a cross-sectional view taken along line VIIIB-VIIIB of FIG. 8A, and FIG. 9A is an antenna mounting according to a second embodiment of the present invention. 9B is a plan view of a washer portion of the nut for use, and FIG. 9B is a cross-sectional view taken along line IXB-IXB of FIG. 9A.
[0030]
In the second embodiment of the present invention, as shown in FIG. 7, the antenna element 2a, the antenna body 2, the bolt 3 and the nut 6 have the same structure as in the first embodiment.
[0031]
As shown in FIGS. 9A and 9B, the washer portion 5 of the antenna mounting nut 4 according to the present embodiment is a substantially annular washer made of, for example, metal, and extends along the outer periphery thereof. It has four teeth 5d arranged at substantially equal intervals. As shown in FIG. 9B, each tooth 5d protrudes only upward without being inclined outward, unlike the first protrusion 5a in the first embodiment.
[0032]
Further, the washer portion 5 has a through hole 5c having an inner diameter through which the bolt portion 3 can be inserted, and four second projecting portions 5b projecting upward substantially along the peripheral edge of the through hole 5c. Are arranged at equal intervals. As shown in FIG. 9 (B), each of the second protrusions 5b has an inner peripheral surface standing upright in the radial direction, whereas an outer peripheral surface thereof has an inner peripheral side. It has such a shape that it is inclined toward.
[0033]
More specifically, each of the second protruding portions 5b extends above the toothed portion 5d formed along the outer periphery of the washer portion 5, and the upper end of the outer peripheral surface thereof is 1 are arranged so as to have an outer diameter smaller than the inner diameter of the mounting through hole 1a. The outer peripheral surface of the first protrusion 5b extends downward and is arranged so as to have an outer diameter larger than the inner diameter of the mounting through-hole 1a. For this reason, at the time of mounting the antenna, the upper end of the outer peripheral surface of each second protruding portion 5b of the washer portion 5 enters the mounting through-hole 1a, and the outer peripheral surface thereof is The mounting through-hole 1a is pushed open.
[0034]
The washer portion 5 extends downward similarly to the first embodiment, and three ribs 5e each having a projection formed at the tip are arranged at substantially equal intervals along the periphery of the through hole 5c. As shown in FIG. 9 (B), a second temporary fixing engaging portion 5f having a shape inclined so that the wall surface on the center side is widened is formed toward the center.
[0035]
Each of the ribs 5e of the washer portion 5 is inserted above the through hole 6b of the nut portion 6 and further press-fitted, as shown in FIGS. 8A and 8B. 5, each rib 5e is elastically deformed and engages with the groove 6c of the nut portion 6, and the washer portion 5 is rotatably held by the nut portion 6, thereby forming the antenna mounting nut 4.
[0036]
Next, a method of attaching the antenna body to the roof of the automobile using the antenna attachment nut according to the second embodiment of the present invention will be described.
[0037]
As in the first embodiment, first, the bolt portion 3 of the antenna body 2 is inserted into the mounting through hole 1a of the roof 1 from above, and the first portion of the washer portion 5 rotatably held by the nut portion 6 is formed. The nut part 6 is inserted into the bolt part 3 while aligning the temporary fixing engagement part 5f with the slit 3b of the bolt part 3, and the first temporary fixing engagement part 5f of the washer part 5 of the antenna mounting nut 4 is formed. Is brought into contact with the second temporary engaging portion 3 d of the bolt portion 3. When the antenna mounting nut 4 is further inserted and pressed, the first and second temporary fixing engaging portions 5f and 3d are elastically deformed to each other, and the first temporary fixing engaging portion 5f of the washer 5 and the bolt are connected to each other. The second temporary engaging portion 3 d of the portion 3 is engaged, and the antenna mounting nut 4 is temporarily fixed to the bolt portion 3. Next, when the nut portion 6 is rotated and screwed into the bolt portion 3, the press-contact force against the roof 1 caused by the screwing causes the inner portion of the washer portion 5 as shown in the sectional view of the main part in FIG. Each of the second projecting portions 5b arranged on the periphery pushes the mounting through hole 1a of the roof 1 into and out, and cuts and exposes the coating layer 1b on the inner wall surface of the mounting through hole 1a. The second protrusion 5b contacts the metal layer 1c of the roof 1.
[0038]
As described above, the washer portion of the antenna mounting nut protrudes toward the mounted body, and the second protruding portion that contacts the inner wall surface formed on the mounted body is provided. The second protruding portion pushes and expands the through hole of the attached body, scrapes off the coating layer, and brings the second protruding portion into contact with the metal layer, thereby reliably connecting the antenna ground to the attached body. It is possible to do.
[0039]
Further, in the antenna mounting nut and the antenna mounting structure according to the present embodiment, similarly to the first embodiment, in addition to ensuring the grounding of the antenna, the inner circumference of the washer portion and the inner hole of the bolt portion are provided. Protruding and mutually engageable first and second temporary fixing engagement portions are provided, and these are engaged at the time of mounting the antenna, thereby increasing the number of parts such as addition of resin parts for temporary fixing. Instead, the antenna mounting nut can be temporarily fixed only by inserting the antenna mounting nut from below the bolt portion in the same manner as in the related art.
[0040]
The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention. For example, by providing the washer portion of the first embodiment with the second protruding portion described in the second embodiment, the ground of the antenna may be more reliably secured. Further, for example, in the above-described first and second embodiments, it has been described that four first and second protrusions are provided at substantially equal intervals along the outer periphery and the inner periphery of the washer portion. However, the present invention is not particularly limited to this, and it is possible to arbitrarily arrange any number of the first and second protrusions on the washer. Similarly, in the first and second embodiments described above, the three ribs protruding downward are described as being arranged at substantially equal intervals along the inner periphery of the washer portion. The invention is not limited to this, and any number of ribs can be arbitrarily arranged.
[Brief description of the drawings]
FIG. 1 is a schematic diagram of an antenna main body and an antenna mounting nut mounted on a roof according to a first embodiment of the present invention, and a cross-sectional view of a main part of a first protrusion.
FIG. 2A is a plan view of an antenna mounting nut according to the first embodiment of the present invention, and FIG. 2B is a cross-sectional view taken along line IIB-IIB in FIG. 2A. FIG.
FIG. 3A is a plan view of a washer portion of the antenna mounting nut according to the first embodiment of the present invention, and FIG. 3B is a line IIIB-IIIB of FIG. 3A. FIG.
FIG. 4A is a plan view of a nut portion of the antenna mounting nut according to the first embodiment of the present invention, and FIG. 4B is a view taken along a line IVB-IVB in FIG. 4A. FIG.
FIG. 5A is a plan view of a bolt portion of the antenna main body according to the first embodiment of the present invention, and FIG. 5B is along a line VB-VB in FIG. 5A. It is sectional drawing.
FIG. 6 is a view showing a method of temporarily fixing an antenna mounting nut to a bolt portion of an antenna body according to the first embodiment of the present invention, and FIG. 6 (A) shows a state before the temporary fixing; 6 (B) shows the state after the temporary fixing.
FIG. 7 is a schematic view of an antenna main body and an antenna mounting nut mounted on a roof according to a second embodiment of the present invention, and a cross-sectional view of a main part of a second protrusion.
FIG. 8A is a plan view of an antenna mounting nut according to a second embodiment of the present invention, and FIG. 8B is a cross-sectional view taken along the line VIIIB-VIIIB of FIG. 8A. FIG.
FIG. 9A is a plan view of a washer portion of an antenna mounting nut according to a second embodiment of the present invention, and FIG. 9B is a view taken along line IXB-IXB of FIG. 9A. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Roof 1a ... Mounting through-hole 1b ... Coating layer 1c ... Metal layer 2 ... Antenna body 2a ... Antenna element 3 ... Bolt part 3a ... Male thread part 3b ... Slit 3c ... Inner hole 3d ... Second temporary fixing Engaging part 4 Antenna mounting nut 5 Washer part 5a First protruding part 5b Second protruding part 5c Through hole 5d Toothed part 5e Rib 5f First engaging part for temporary fixing 6 nut 6a female screw 6b through hole 6c groove

Claims

The antenna body is screwed into a bolt portion inserted from one side into a through hole formed in the attached body and projecting downward from the antenna body from the other side of the attached body. An antenna mounting nut for mounting on a body,
A washer portion having at least a first projecting portion inclined and projecting toward the attached body;
An antenna mounting nut comprising at least a nut portion screwed to a bolt portion of the antenna body.

The antenna body is screwed into a bolt portion inserted from one side into a through hole formed in the attached body and projecting downward from the antenna body from the other side of the attached body. An antenna mounting nut for mounting on a body,
A washer portion projecting toward the attached body and having at least a second projecting portion that contacts an inner wall surface of a through hole of the attached body;
An antenna mounting nut comprising at least a nut portion screwed to a bolt portion of the antenna body.

An antenna mounting structure for mounting an antenna on an object to be mounted,
A bolt portion that is inserted from one side into a through hole formed in the attached body and that protrudes downward from the antenna body,
A nut portion to be screwed into the bolt portion of the antenna main body from the other side of the attached body;
An antenna mounting structure having at least a first protruding portion inclined and protruding toward the mounted member, and at least a washer portion interposed above the nut portion.

An antenna mounting structure for mounting an antenna on an object to be mounted,
A bolt portion that is inserted from one side into a through hole formed in the attached body and that protrudes downward from the antenna body,
A nut portion to be screwed into the bolt portion of the antenna main body from the other side of the attached body;
At least a second protruding portion protruding toward the attached body and contacting an inner wall surface of a through hole of the attached body, and at least a washer portion interposed above the nut portion Antenna mounting structure.