JP4061339B2 - Crime prevention equipment with a structure for preventing prying - Google Patents

Crime prevention equipment with a structure for preventing prying Download PDF

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JP4061339B2
JP4061339B2 JP18470599A JP18470599A JP4061339B2 JP 4061339 B2 JP4061339 B2 JP 4061339B2 JP 18470599 A JP18470599 A JP 18470599A JP 18470599 A JP18470599 A JP 18470599A JP 4061339 B2 JP4061339 B2 JP 4061339B2
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chassis
cover
opening
claw
recess
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JP2001014559A (en
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記一 村田
祐幸 池田
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Optex Co Ltd
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Optex Co Ltd
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Priority to FR0008245A priority patent/FR2795850B1/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K5/00—Casings, cabinets or drawers for electric apparatus
    • H05K5/02—Details
    • H05K5/0208—Interlock mechanisms; Means for avoiding unauthorised use or function, e.g. tamperproof

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Casings For Electric Apparatus (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、こじ開け防止構造を備えた侵入者検知用の防犯機器に関するものである。
【０００２】
【従来の技術および発明が解決しようとする課題】
図５は、従来の防犯機器の一例である防犯センサを示す縦断面図である。この防犯センサ１は、天井や壁などの取付面に取り付けるシャーシ２１と、その開口面２０を覆うカバー２２からなるケース２を備えている。これらシャーシ２１とカバー２２は、それぞれ樹脂で形成される。そして、前記シャーシ２１内にセンサ部の電気回路を形成した基板３がリブ３０を介して取り付けられ、この基板３にＰＩＲ（受動型赤外線）受光素子４、ＭＷ（マイクロ波）送受信回路５、タンパースイッチ６等が設けられている。また、前記カバー２２のＰＩＲ受光素子４との対向部位には、シャーシ２１側に向かって凹入する凹部２３が形成され、その底壁にＰＩＲ受光素子４の受光部を外部に露出する窓２４が形成されている。さらに、窓２４の前方側Ｆには、ＰＩＲ受光素子４の検知エリアを設定するフレネルレンズのようなレンズ７が嵌め込まれている。図中、４０は前記ＰＩＲ受光素子４を基板３に固定するための取付け台である。
【０００３】
ところで防犯機器は、妨害行為を受け易い。例えば防犯機器が非警戒中である日中などに侵入し、カバー２２をこじ開けて内部のセンサ部が人体を検知しないように操作した上で、再び夜間などの警戒中に侵入して犯罪を行う場合がある。そのため、防犯機器の多くは、カバー２２をシャーシ２１から取り外したり、こじ開けたりすると、前記タンパースイッチ６の作動により妨害検知信号（タンパー信号）が出力されて警報が発せられるように構成されている。このとき、通常想定されるカバーの開閉動作にてタンパースイッチ６が敏感に動作するよう、カバーの開閉する支点となる係合爪５１から離れた位置にタンパースイッチ６を設けることが一般的である。ところが、侵入者はカバー２２の支点となる一端部側（図５の上部側）を僅かな隙間だけこじ開け、その隙間より針金、薄板等を差し込んで、警報が発せられないように操作する。
【０００４】
このため上記防犯機器では、こじ開け防止対策として、カバー２２の一端部で開口端部側に前記係合爪５１を他端部（下部）へ向かって突設し、一方シャーシ２１側には係合爪５１が係合する他端方向（下方）に向かって凹んだ凹所５２を形成している。また、前記カバー２２の他端部には、シャーシ２１に設けた止め部８の挿通孔８５に係脱自在に係止されるねじ体のような止め具９を、板状ナット８４へのねじ込みによって装着する。そして、前記係合爪５１を凹所５２に係合させて、シャーシ２１とカバー２２の他端部側を止め具９により係止する。このようにすると、凹所５２に対する係合爪５１の係合により、カバー２２の一端部側がシャーシ２１の開口面２０と直交する前方側Ｆにこじ開けられるのが阻止される。
【０００５】
しかし以上の構造では、こじ開け防止対策が十分とは言えない。つまり、カバー２２の他端部の固定点である挿通孔８５から一端部側の係合部である係合爪５１までの支点距離Ｌ１が長いので、シャーシ２１とカバー２２の一端部側の係合部にドライバなどを差し込んでこじると、カバー２２が比較的容易に、二点鎖線で示すように変形し、その係合爪５１が凹所５２から外方に抜き出されて係合が解除され、シャーシ２１とカバー２２の間に隙間Ｇが生じるので、この隙間Ｇから針金などを差し込んでセンサ部にいたずらされる可能性がある。このようなことは、特にベルギー国のＡＮＰＩ規格などでは認められない。また、カバー２２は、樹脂製のため外部から大きな衝撃を受けると変形し易い。このため、カバー２２に係合爪５１が凹所５２から抜け出る方向に大きな衝撃がかかると、カバー２２がシャーシ２１から外れる可能性もある。このことについても、ドイツ国のＶｄＳ規格やフランス国のＮｆａ２Ｐ規格などでは認められていない。
【０００６】
また、従来では、図６の構造のものも知られている。この構造は、シャーシ２１の中央底部から前方Ｆに向かってボス５３を立設し、一方カバー２２の中央前面には前記ボス５３側に向かう凹部５４を形成して、この凹部５４の底壁に設ける挿通孔を通してビス５５をボス５３にねじ込むことにより、カバー２２をシャーシ２１に固定する。
【０００７】
図６の構造によれば、シャーシ２１に対するカバー２２の固定点が中央に位置し、カバー２２の開口周縁部２２ａまでの支点距離Ｌ２が短いので、この開口周縁部２２ａが変形し難くなるので、こじ開けが困難となる。しかし、製品の正面に凹部５４やビス５５が位置するため、製品の外観が悪くなる。このとき、外観を良好とするために、凹部５４の開口に蓋５８を設けるが、このようにすると、施工性が悪くなって製品コストが高くなる。また前記蓋５８は、小さいので紛失し易い。しかも、シャーシ２１の中央にボス５３を設けるから、前記基板３にボス５３を通過させるための孔５６を形成する必要があるので、基板３に形成する電気回路の設計に制約を受ける。
【０００８】
そこで本発明は、上記問題点を解決して、簡単かつ低コストでカバーのこじ開けを確実に防止し、しかも衝撃によりカバーが外れたりするのを防止して各国の規格をクリアできる防犯機器を提供することを目的とする。
【０００９】
【課題を解決するための手段】
上記目的を達成するため、本発明の防犯機器は、ケースが、取付面に取り付けられるシャーシと、このシャーシの前方へ向いた開口を覆うカバーとからなり、前記カバーの一側部に、シャーシの被係合部に係合して、前記一側部がシャーシの開口からその開口面と直交する方向に移動するのを阻止する係合爪と、前記シャーシの一側部の内面に係合して前記カバーがシャーシの開口面と平行な方向に移動するのを阻止する口開き防止爪が設けられ、前記係合爪１３は開口面２０と平行に前記カバー２２の内方向に向かって突出し、前記口開き防止爪１４は前記係合爪１３の突出した先端部に形成され、前記シャーシ２１の後面に向かって突出しており、前記シャーシの被係合部は、前記係合爪が開口面と平行な前記内方向に進入する凹所と、前記凹所の内端から連続的に前記シャーシの内面に沿って前記開口面と直交する方向に沿って延び、シャーシの後面に向かって開口する溝とを有し、前記口開き防止爪は、前記シャーシに形成した前記凹所から前記溝へ差し込まれて、前記溝と係合し、前記カバーの他側部には、シャーシの止め部に係脱自在に係止される止め具が装着されている。
【００１０】
上記構成によれば、前記カバーの一側部に設けた係合爪がシャーシの被係合部に係合することにより、前記一側部がシャーシの開口面からこれと直交する方向に移動するのが阻止される。また、前記口開き防止爪がシャーシの一側部の内面に係合することにより、カバーがシャーシの開口面と平行な方向に移動するのが阻止される。つまり、シャーシとカバーの接合部にドライバなどを差し込んでこじ開けようとしても、前記口開き防止爪がシャーシの内面に係合しているので、カバーが前記開口面と平行方向にこじ開けられることはない。このため、カバーはシャーシの開口面と直交方向および平行方向の何れにもこじ開けられることがなく、ケース内の電気回路へのいたずらが確実に防止される。さらに、カバーに係合爪が被係合部から抜け出る方向に衝撃がかかっても、口開き爪がシャーシの内面に係合しているので、カバーはシャーシから外れることがない。したがって、各国の規格をクリアできる。しかも、シャーシやカバーの中央部にボスや凹部を設けてカバーをシャーシにビス止めする従来の場合のように、電気回路の設計に制約を与えたり、外観を悪くしたりすることなく、簡単かつ低コストで所期の目的が達成される。また、前記凹所を設けることで、係合爪の被係合部への係合を容易に行える。さらに、カバーの一側部がシャーシの開口面と直交方向に移動するのが、前記係合爪の凹所への係合により確実に阻止される。また、前記溝を設けることで、前記口開き防止爪と係合爪の両者を凹所から溝に沿って係合させ易くなり、しかも両者を係合させるための前記被係合部の構造が簡単となる。特にシャーシの全体を樹脂で形成するとき、金型構造を簡単としながら、凹所と溝の同時成形が可能となる。
【００１４】
【発明の実施の形態】
以下、本発明の一実施形態を図面に基づいて説明する。
図１は、本発明の一実施形態にかかるこじ開け防止構造を備えた防犯機器の全体構造の斜視図を示している。図２は、図１のＸ−Ｘ線方向の縦断面図を示す。各図に示す防犯機器１の内部構造は、前述した従来のものと基本的に同一であるので、同一部分には同一符号を付して、その詳細な説明は省略する。図１において、ほぼ直方体形状のケース２の内部には、予め定めた検知エリア内の侵入者を検知するＰＩＲ受光素子４およびＭＷ送受信回路５を含むセンサ部が収納されており、このセンサ部からの人体検出信号が外部の出力回路に入力されて、出力回路から警報器または警備センターなどへ警報信号が出力される。
【００１５】
ケース２を構成するシャーシ２１の上部で開口端部側の複数個所に、図２に示すように、下方向に凹入する凹所１０と、この凹所１０の下端側から連続状にシャーシ２１の内面に沿って開口面２０と直交する前後方向に延び、シャーシ２１の後面側に開口する溝１１とからなる被係合部１２を形成している。この被係合部１２は、図３に示すように、シャーシ２１から前方Ｆへ突出した突出部１６に形成されている。また、図２のシャーシ２１の開口面２０を覆うカバー２２の上部で、カバー開口端部側の複数個所には、下方に向かって突出し、前記凹所１０に係合してカバー２２がシャーシ２１に対し前方側Ｆにこじ開けられるのを阻止する係合爪１３を設け、この係合爪１３の下部に、シャーシ２１に向かって突出し、前記溝１１に係合してカバー２２が上方にこじ開けられるのを阻止する口開き防止爪１４を一体に設けている。この係合爪１３と口開き防止爪１４を一体化した爪部材１７は、図３に明示するように、カバー２２の開口端部に一体形成されて、後方Ｒへ突出している。
【００１６】
図２に示すカバー２２の下部側には、従来の場合と同様にシャーシ２１の下部に設けた止め部８に係脱自在に係止される止め具９を設ける。図２の実施形態では、前記止め部８として、シャーシ２１の底部から受部８１を突設し、この受部８１に挿通孔８５を形成している。一方、カバー２２側には、前記受部８１に対向する保持部８２を形成し、この保持部８２に設けた挿入スリット８３に板状ナット８４を挿入している。前記止め具９としてねじ体を用い、これを保持部８２の下方からナット８４にねじ込んで、ねじ体９の先端部Ｅを受部８１の挿通孔８５に挿通させることによりカバー２２の下部側をシャーシ２１に係止する。なお、本発明では、止め具９として、前記ねじ体を用いる以外に、例えばカバー２２をシャーシ２１にスライドロックしてねじ止めするような他の構造を用いてもよい。
【００１７】
次に、以上の構造による作用を図４に基づいて説明する。先ず、同図の実線で示すように、カバー２２の全体を傾けながら係合爪１３の下部に突設した口開き防止爪１４を、シャーシ２１に形成した凹所１０から溝１１へと差し込む。そして、カバー２２の姿勢をＡ方向に戻しながら、口開き防止爪１４と係合爪１３をさらに内方に押し込んで、仮想線で示すように口開き爪１４を溝１１に、係合爪１３を凹所１０に、それぞれ係合させる。この後、図２のカバー２２の下部側をシャーシ２１の下部側に被嵌させて、止め具９により係止する。
【００１８】
このようにすれば、前記係合爪１３の凹所１０への係合により、カバー２２がシャーシ２１に対し前方側Ｆにこじ開けられるのが阻止される。また、前記口開き爪１４の溝１１への係合により、カバー２２が上方にこじ開けられるのが阻止される。つまり、シャーシ２１とカバー２２の接合部にドライバなどを差し込んでこじ開けようとしても、前記口開き防止爪１４はシャーシ内面の溝１１に係合されているので、カバー２２はシャーシ２１の上方側にこじ開けられるのが阻止される。このため、カバー２２はシャーシ２１の前方および上方の何れの方向にもこじ開けられることがなく、ケース２内の電気回路へのいたずらが防止される。しかも、カバー２２に係合爪５１が凹所５２から抜け出る方向に大きな衝撃がかかっても、前記口開き防止爪１４の溝１１への係合により、カバー２２がシャーシ２１から外れることはない。よって、各国の規格をクリアできる。
【００１９】
また、シャーシ２１に対するカバー２２のこじ開けを防止するにあたっては、被係合部１２としては従来のものが使用され、従来の係合爪１３に口開き爪１４を追加するだけであるので、構造が簡単となって製造コストの上昇が抑制される。つまり、シャーシ２１の製作時には、その開口面２０に対して前後方向に開閉する２つの割り型を用い、この後部の型から前方Ｆに突設するピンをシャーシ２１の後面側から凹所１０の形成部位にまで挿入させて成形することにより、シャーシ２１と同時に前記凹所１０と溝１１を形成する。したがって、シャーシ２１に設ける被係合部１２は従来のままとし、カバー２２側の係合爪１３に口開き爪１４を追加する簡単な構成により、カバー２２のこじ開けが防止される。また、組付要領も従来と同一なので、組付ミスも起り難い。しかも、シャーシ２１やカバー２２の中央部にボスや凹部を設けて、カバー２２をシャーシ２１にビス止めする従来の場合のように、基板３に形成する電気回路の設計に制約を与えたり、外観を悪くすることがない。
【００２０】
また、前記ケース２の内部機器を調整する場合は、ビス９を外した後、口開き爪１４を備えた係合爪１３を被係合部１２から抜き出し、カバー２２をシャーシ２１から取り外して行う。
【００２１】
以上の実施形態では、カバー２２とシャーシ２１の上部側に、口開き爪１４を備えた係合爪１３と被係合部１２を設けたが、これらはカバー２２とシャーシ２１の下部、左側部または右側部に設けてもよい。この場合は、反対側に止め部８と止め具９を設ける。
【００２２】
本発明は、上記実施形態のような防犯センサ１に限らず、防犯センサ１に接続される出力回路を内蔵したコントローラのような他の防犯機器にも適用できる。
【００２３】
【発明の効果】
以上のように、本発明によれば、簡単かつ低コストでカバーのこじ開けを防止でき、しかも衝撃によりカバーがシャーシから外れたりするのを防止できて、各国の規格をクリアできる。
【図面の簡単な説明】
【図１】本発明にかかる防犯機器の一実施形態を示す全体の斜視図である。
【図２】図１のII−II線断面図である。
【図３】同防犯機器の要部を一部破断して示す分解斜視図である。
【図４】シャーシに対するカバーの組付状態を示す断面図である。
【図５】従来例を示す縦断面図である。
【図６】同じく他の従来例を示す縦断面図である。
【符号の説明】
２…ケース、３…基板（電気回路）、２０…開口面、２１…シャーシ、２２…カバー、８…止め部、９…止め具、１０…凹所、１１…溝、１２…被係合部、１３…係合爪、１４…口開き防止爪。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a crime prevention device for detecting an intruder provided with a pry-off prevention structure.
[0002]
[Background Art and Problems to be Solved by the Invention]
FIG. 5 is a longitudinal sectional view showing a security sensor which is an example of a conventional security device. The security sensor 1 includes a case 21 including a chassis 21 attached to an attachment surface such as a ceiling or a wall, and a cover 22 covering the opening surface 20 thereof. The chassis 21 and the cover 22 are each formed of resin. A substrate 3 in which an electric circuit of a sensor unit is formed in the chassis 21 is attached via a rib 30, and a PIR (passive infrared) light receiving element 4, a MW (microwave) transmission / reception circuit 5, and a tamper are attached to the substrate 3. A switch 6 and the like are provided. Further, a concave portion 23 that is recessed toward the chassis 21 is formed at a portion of the cover 22 facing the PIR light receiving element 4, and a window 24 that exposes the light receiving portion of the PIR light receiving element 4 to the outside on the bottom wall. Is formed. Further, a lens 7 such as a Fresnel lens for setting a detection area of the PIR light receiving element 4 is fitted on the front side F of the window 24. In the figure, reference numeral 40 denotes a mounting base for fixing the PIR light receiving element 4 to the substrate 3.
[0003]
By the way, crime prevention devices are susceptible to sabotage. For example, intrusion occurs during the day when the security device is not alerted, and the cover 22 is opened and the internal sensor unit is operated so as not to detect the human body, and then the intruder is intruded again during the alert such as at night. There is a case. Therefore, most of the crime prevention devices are configured such that when the cover 22 is removed from the chassis 21 or pry open, an interference detection signal (tamper signal) is output by the operation of the tamper switch 6 and an alarm is issued. At this time, it is common to provide the tamper switch 6 at a position away from the engaging claw 51 serving as a fulcrum for opening and closing the cover so that the tamper switch 6 operates sensitively in the normally opening and closing operation of the cover. . However, the intruder operates the end of the cover 22 (the upper side in FIG. 5) by a small gap and inserts a wire, a thin plate, etc. from the gap so that no alarm is generated.
[0004]
For this reason, in the above-described crime prevention device, as an anti-pick-up measure, the engagement claw 51 protrudes toward the other end (lower part) at one end of the cover 22 toward the opening end, and engages on the chassis 21 side. A recess 52 that is recessed toward the other end direction (downward) with which the claw 51 is engaged is formed. Further, the other end of the cover 22 is screwed into a plate-like nut 84 with a stopper 9 such as a screw body that is removably locked in an insertion hole 85 of the stopper 8 provided in the chassis 21. Install by. Then, the engaging claw 51 is engaged with the recess 52, and the other end side of the chassis 21 and the cover 22 is locked by the stopper 9. In this way, the engagement of the engagement claw 51 with the recess 52 prevents the one end portion of the cover 22 from being pry open to the front side F perpendicular to the opening surface 20 of the chassis 21.
[0005]
However, with the above structure, it can not be said that the measures for preventing prying are sufficient. That is, since the fulcrum distance L1 from the insertion hole 85 which is a fixing point of the other end portion of the cover 22 to the engaging claw 51 which is the engaging portion on the one end portion side is long, the engagement between the one end portion side of the chassis 21 and the cover 22 is long. When a screwdriver or the like is inserted and squeezed into the joint, the cover 22 is relatively easily deformed as shown by a two-dot chain line, and the engaging claw 51 is pulled out from the recess 52 to release the engagement. Since a gap G is generated between the chassis 21 and the cover 22, there is a possibility that a wire or the like is inserted from the gap G to be tampered with by the sensor unit. Such a situation is not recognized in particular by the Belgian ANPI standard. Further, since the cover 22 is made of resin, it is easily deformed when subjected to a large impact from the outside. For this reason, if a large impact is applied to the cover 22 in the direction in which the engaging claw 51 comes out of the recess 52, the cover 22 may be detached from the chassis 21. This is also not recognized by the German VdS standard or the French Nfa2P standard.
[0006]
Conventionally, the structure of FIG. 6 is also known. In this structure, a boss 53 is erected from the center bottom of the chassis 21 toward the front F, while a recess 54 is formed on the center front surface of the cover 22 toward the boss 53 side. The cover 22 is fixed to the chassis 21 by screwing the screw 55 into the boss 53 through the provided insertion hole.
[0007]
According to the structure of FIG. 6, since the fixing point of the cover 22 with respect to the chassis 21 is located at the center and the fulcrum distance L2 to the opening peripheral edge 22a of the cover 22 is short, the opening peripheral edge 22a is not easily deformed. It is difficult to pry open. However, since the recess 54 and the screw 55 are located in front of the product, the appearance of the product is deteriorated. At this time, in order to improve the appearance, a cover 58 is provided at the opening of the recess 54. However, if this is done, the workability is deteriorated and the product cost is increased. The lid 58 is small and easily lost. Moreover, since the boss 53 is provided in the center of the chassis 21, it is necessary to form a hole 56 for allowing the boss 53 to pass through the substrate 3, so that the design of the electric circuit formed on the substrate 3 is restricted.
[0008]
Therefore, the present invention provides a crime prevention device that solves the above-mentioned problems, reliably prevents the cover from being opened easily and at low cost, and prevents the cover from being removed due to an impact, thereby clearing the standards of each country. The purpose is to do.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the crime prevention device of the present invention comprises a chassis having a case attached to a mounting surface and a cover that covers an opening facing the front of the chassis. An engaging claw that engages with the engaged portion and prevents the one side portion from moving in a direction perpendicular to the opening surface of the chassis, and an inner surface of the one side portion of the chassis. An opening preventing claw for preventing the cover from moving in a direction parallel to the opening surface of the chassis, and the engaging claw 13 protrudes inward of the cover 22 in parallel to the opening surface 20; The opening prevention claw 14 is formed at the protruding tip of the engaging claw 13 and protrudes toward the rear surface of the chassis 21. The engaged portion of the chassis has the engaging claw and an opening surface. a recess that enters the parallel said direction, Continuously from said inner end of the serial recess along the inner surface of the chassis extends along a direction orthogonal to the opening surface, and a groove open toward the rear surface of the chassis, the outlet opening prevention claws A stopper that is inserted into the groove from the recess formed in the chassis, engages with the groove, and is detachably locked to the stopper of the chassis is attached to the other side of the cover. Has been.
[0010]
According to the above configuration, the engaging claw provided on one side portion of the cover engages with the engaged portion of the chassis, whereby the one side portion moves in a direction perpendicular to the opening surface of the chassis. Is prevented. Further, the opening preventing claw is engaged with the inner surface of one side portion of the chassis, thereby preventing the cover from moving in a direction parallel to the opening surface of the chassis. In other words, even if a screwdriver or the like is inserted into the joint between the chassis and the cover to pry it open, the cover is not pricked in a direction parallel to the opening surface because the mouth opening preventing claw is engaged with the inner surface of the chassis. . For this reason, the cover is not opened in any of the orthogonal direction and the parallel direction with respect to the opening surface of the chassis, and the tampering with the electric circuit in the case is reliably prevented. Furthermore, even if an impact is applied to the cover in the direction in which the engaging claw is pulled out from the engaged portion, the cover does not come off the chassis because the opening claw is engaged with the inner surface of the chassis. Therefore, the standards of each country can be cleared. Moreover, unlike the conventional case where a boss or a recess is provided in the center of the chassis or cover and the cover is screwed to the chassis, there is no restriction on the design of the electric circuit and the appearance is not deteriorated. The intended purpose is achieved at low cost. Further, by providing the recess, the engagement claw can be easily engaged with the engaged portion. Further, the one side portion of the cover is reliably prevented from moving in the direction orthogonal to the opening surface of the chassis by the engagement of the engagement claw with the recess. In addition, by providing the groove, it is easy to engage both the mouth opening preventing claw and the engaging claw along the groove from the recess, and the structure of the engaged portion for engaging both is provided. It will be easy. In particular, when the entire chassis is formed of resin, the recess and the groove can be simultaneously formed while simplifying the mold structure.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1: has shown the perspective view of the whole structure of the crime prevention apparatus provided with the prying-opening prevention structure concerning one Embodiment of this invention. FIG. 2 shows a longitudinal sectional view in the direction of line XX in FIG. The internal structure of the security device 1 shown in each figure is basically the same as that of the conventional device described above, so the same parts are denoted by the same reference numerals and detailed description thereof is omitted. In FIG. 1, a sensor unit including a PIR light receiving element 4 for detecting an intruder in a predetermined detection area and a MW transmission / reception circuit 5 is housed in a substantially rectangular parallelepiped case 2. The human body detection signal is input to an external output circuit, and an alarm signal is output from the output circuit to an alarm device or a security center.
[0015]
As shown in FIG. 2, as shown in FIG. 2, a recess 10 that is recessed downward and a lower end side of the recess 10 are continuously formed from a lower end side of the recess 21. An engaged portion 12 is formed which extends in the front-rear direction perpendicular to the opening surface 20 along the inner surface of the housing and includes a groove 11 opening on the rear surface side of the chassis 21. As shown in FIG. 3, the engaged portion 12 is formed in a protruding portion 16 that protrudes forward F from the chassis 21. In addition, the upper portion of the cover 22 covering the opening surface 20 of the chassis 21 in FIG. 2 protrudes downward at a plurality of locations on the cover opening end side, and engages with the recess 10 so that the cover 22 is engaged with the chassis 21. On the other hand, an engaging claw 13 for preventing the front side F from being opened is provided. A lower portion of the engaging claw 13 protrudes toward the chassis 21 and engages with the groove 11 to open the cover 22 upward. A mouth opening preventing claw 14 is provided integrally. As clearly shown in FIG. 3, the claw member 17 in which the engagement claw 13 and the mouth opening prevention claw 14 are integrated is integrally formed at the opening end portion of the cover 22 and protrudes rearward R.
[0016]
As in the conventional case, a stopper 9 is provided on the lower side of the cover 22 shown in FIG. In the embodiment of FIG. 2, a receiving portion 81 is projected from the bottom of the chassis 21 as the stop portion 8, and an insertion hole 85 is formed in the receiving portion 81. On the other hand, a holding portion 82 that faces the receiving portion 81 is formed on the cover 22 side, and a plate nut 84 is inserted into an insertion slit 83 provided in the holding portion 82. A screw body is used as the stopper 9, which is screwed into the nut 84 from below the holding portion 82, and the tip end E of the screw body 9 is inserted into the insertion hole 85 of the receiving portion 81, thereby lowering the lower side of the cover 22. Lock to the chassis 21. In the present invention, in addition to using the screw body as the stopper 9, for example, another structure in which the cover 22 is slide-locked to the chassis 21 and screwed may be used.
[0017]
Next, the effect | action by the above structure is demonstrated based on FIG. First, as shown by the solid line in the figure, the mouth opening preventing claw 14 projecting from the lower portion of the engaging claw 13 while the entire cover 22 is inclined is inserted into the groove 11 from the recess 10 formed in the chassis 21. Then, while returning the posture of the cover 22 to the A direction, the mouth opening preventing claw 14 and the engaging claw 13 are further pushed inward, so that the mouth opening claw 14 enters the groove 11 and the engaging claw 13 as indicated by a virtual line. Are engaged with the recesses 10 respectively. Thereafter, the lower side of the cover 22 in FIG. 2 is fitted on the lower side of the chassis 21 and locked by the stopper 9.
[0018]
In this way, the cover 22 is prevented from being pry open to the front side F with respect to the chassis 21 by the engagement of the engagement claw 13 with the recess 10. Further, the engagement of the opening pawl 14 with the groove 11 prevents the cover 22 from being pryed upward. That is, even if a screwdriver or the like is inserted into the joint between the chassis 21 and the cover 22 to pry it open, the cover opening claw 14 is engaged with the groove 11 on the inner surface of the chassis, so that the cover 22 is located above the chassis 21. It is blocked from being opened. For this reason, the cover 22 is not pry open in either the front or upper direction of the chassis 21, and mischief to the electric circuit in the case 2 is prevented. In addition, even if a large impact is applied to the cover 22 in the direction in which the engaging claw 51 comes out of the recess 52, the cover 22 does not come off the chassis 21 due to the engagement of the mouth opening preventing claw 14 with the groove 11. Therefore, the standards of each country can be cleared.
[0019]
Further, in order to prevent the cover 22 from being opened with respect to the chassis 21, a conventional one is used as the engaged portion 12, and only the opening claw 14 is added to the conventional engagement claw 13, so that the structure is improved. This simplifies and suppresses an increase in manufacturing cost. That is, when the chassis 21 is manufactured, two split molds that open and close in the front-rear direction with respect to the opening surface 20 are used, and a pin projecting forward F from the rear mold is formed on the recess 10 from the rear surface side of the chassis 21. The recess 10 and the groove 11 are formed simultaneously with the chassis 21 by being inserted into the formation site and molded. Therefore, the engaged portion 12 provided in the chassis 21 is kept as it is, and the opening of the cover 22 is prevented by a simple configuration in which the opening claw 14 is added to the engagement claw 13 on the cover 22 side. Also, since the assembly procedure is the same as before, assembly errors are unlikely to occur. Moreover, the design of the electric circuit formed on the substrate 3 may be restricted, as in the conventional case where a boss or a recess is provided in the center of the chassis 21 or the cover 22 and the cover 22 is screwed to the chassis 21. No worse.
[0020]
Further, when adjusting the internal device of the case 2, after removing the screw 9, the engaging claw 13 having the opening claw 14 is extracted from the engaged portion 12 and the cover 22 is removed from the chassis 21. .
[0021]
In the above embodiment, the engaging claw 13 and the engaged portion 12 provided with the opening claw 14 are provided on the upper side of the cover 22 and the chassis 21. Or you may provide in a right side part. In this case, the stopper 8 and the stopper 9 are provided on the opposite side.
[0022]
The present invention can be applied not only to the security sensor 1 as in the above embodiment but also to other security devices such as a controller having a built-in output circuit connected to the security sensor 1.
[0023]
【The invention's effect】
As described above, according to the present invention, it is possible to easily and inexpensively prevent the cover from being opened, and to prevent the cover from coming off the chassis due to an impact, thereby clearing the standards of each country.
[Brief description of the drawings]
FIG. 1 is an overall perspective view showing an embodiment of a security device according to the present invention.
2 is a cross-sectional view taken along line II-II in FIG.
FIG. 3 is an exploded perspective view showing a main part of the security device with a part broken away.
FIG. 4 is a cross-sectional view showing an assembled state of a cover with respect to a chassis.
FIG. 5 is a longitudinal sectional view showing a conventional example.
FIG. 6 is a longitudinal sectional view showing another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Case, 3 ... Board | substrate (electric circuit), 20 ... Opening surface, 21 ... Chassis, 22 ... Cover, 8 ... Stop part, 9 ... Stopper, 10 ... Recess, 11 ... Groove, 12 ... Engaged part , 13 ... engaging claw, 14 ... mouth opening preventing claw.

Claims (1)

ケース２内に電気回路を収納した侵入者検知用の防犯機器１であって、
前記ケース２が、取付面に取り付けられるシャーシ２１と、このシャーシ２１の前方へ向いた開口を覆うカバー２２とからなり、
前記カバー２２の一側部に、シャーシ２１の被係合部１２に係合して、前記一側部がシャーシ２１の開口からその開口面２０と直交する方向に移動するのを阻止する係合爪１３と、前記シャーシ２１の一側部の内面に係合して前記カバー２２がシャーシ２１の開口面２０と平行な方向に移動するのを阻止する口開き防止爪１４が設けられ、
前記係合爪１３は開口面２０と平行に前記カバー２２の内方向に向かって突出し、
前記口開き防止爪１４は前記係合爪１３の突出した先端部に形成され、前記シャーシ２１の後面に向かって突出しており、
前記シャーシ２１の被係合部１２は、前記係合爪１３が開口面２０と平行な前記内方向に進入する凹所１０と、前記凹所１０の内端から連続的に前記シャーシ２１の内面に沿って前記開口面２０と直交する方向に沿って延び、シャーシ２１の後面に向かって開口する溝１１とを有し、
前記口開き防止爪１４は、前記シャーシ２１に形成した前記凹所１０から前記溝１１へ差し込まれて、前記溝１１と係合し、
前記カバー２２の他側部に、シャーシ２１の止め部８に係脱自在に係止される止め具９が装着されている防犯機器。A crime prevention device 1 for detecting an intruder in which an electric circuit is housed in a case 2,
The case 2 includes a chassis 21 attached to a mounting surface and a cover 22 covering an opening facing the front of the chassis 21;
Engagement with one side portion of the cover 22 engaging with the engaged portion 12 of the chassis 21 to prevent the one side portion from moving in the direction orthogonal to the opening surface 20 from the opening of the chassis 21. A claw 13 and a mouth opening preventing claw 14 that engages with an inner surface of one side of the chassis 21 to prevent the cover 22 from moving in a direction parallel to the opening surface 20 of the chassis 21;
The engaging claw 13 protrudes inward of the cover 22 in parallel with the opening surface 20;
The mouth opening preventing claw 14 is formed at the protruding tip of the engaging claw 13 and protrudes toward the rear surface of the chassis 21 ;
The engaged portion 12 of the chassis 21 includes a recess 10 in which the engaging claw 13 enters the inward direction parallel to the opening surface 20, and an inner surface of the chassis 21 continuously from the inner end of the recess 10. And a groove 11 extending along a direction perpendicular to the opening surface 20 and opening toward the rear surface of the chassis 21,
The mouth opening prevention claw 14 is inserted into the groove 11 from the recess 10 formed in the chassis 21, and engages with the groove 11.
A security device in which a stopper 9 that is detachably locked to the stopper 8 of the chassis 21 is attached to the other side of the cover 22.
JP18470599A 1999-06-30 1999-06-30 Crime prevention equipment with a structure for preventing prying Expired - Fee Related JP4061339B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP18470599A JP4061339B2 (en) 1999-06-30 1999-06-30 Crime prevention equipment with a structure for preventing prying
BE2000/0410A BE1013808A3 (en) 1999-06-30 2000-06-27 SECURITY DEVICE WITH A STRUCTURE PROTECTED AGAINST HANDLING.
FR0008245A FR2795850B1 (en) 1999-06-30 2000-06-27 SAFETY DEVICE WITH STRUCTURE PROTECTED AGAINST MANIPULATIONS

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18470599A JP4061339B2 (en) 1999-06-30 1999-06-30 Crime prevention equipment with a structure for preventing prying

Publications (2)

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JP2001014559A JP2001014559A (en) 2001-01-19
JP4061339B2 true JP4061339B2 (en) 2008-03-19

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JP2005322149A (en) * 2004-05-11 2005-11-17 Optex Co Ltd Attaching and detaching structure of burglar sensor and bracket
GB2577040A (en) * 2018-09-05 2020-03-18 Honeywell Int Inc Thermostat comprising a moveable cover

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JPS5736016Y2 (en) * 1977-12-26 1982-08-09
JPS6044187U (en) * 1983-09-01 1985-03-28 白柳　伊佐雄 Anti-theft locking device
JPH0531747Y2 (en) * 1986-12-23 1993-08-16
DE3743865A1 (en) * 1987-12-23 1989-07-13 Emmerich Christoph Gmbh Co Kg TELECOMMUNICATIONS DEVICE, ESPECIALLY TELEPHONE EXTENSION
JPH03139999A (en) * 1989-10-25 1991-06-14 Nippon Chemicon Corp Speaker equipment
JPH0531313A (en) * 1991-07-29 1993-02-09 N Ii R:Kk Air cleaner
JP3356241B2 (en) * 1995-02-01 2002-12-16 株式会社デンソー Intake device for internal combustion engine
JP3086406B2 (en) * 1995-10-04 2000-09-11 オプテックス株式会社 Passive infrared human body detector
JP3305556B2 (en) * 1995-12-27 2002-07-22 アルプス電気株式会社 Theft monitoring device
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JP2001014559A (en) 2001-01-19
FR2795850B1 (en) 2005-02-04
FR2795850A1 (en) 2001-01-05

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