JP4523712B2

JP4523712B2 - Industrial vehicle alarm sound transmitter

Info

Publication number: JP4523712B2
Application number: JP2000313274A
Authority: JP
Inventors: 貴寛今出川; 孝幸浜野; 英俊二礼木; 功福井
Original assignee: Mitsubishi Heavy Industries Ltd
Current assignee: Mitsubishi Heavy Industries Ltd
Priority date: 2000-10-13
Filing date: 2000-10-13
Publication date: 2010-08-11
Anticipated expiration: 2020-10-13
Also published as: JP2002121000A

Description

【０００１】
【発明の属する技術分野】
本発明は、フォークリフト、建設機械等の産業車両に適用され、車両の後進走行時に前後進切換レバーの後進切換えに従いアラーム音を発生し、該アラーム音をスピーカを介して発信する産業車両のアラーム音発信装置に関する。
【０００２】
【従来の技術】
フォークリフトは、工場内や屋内外の荷役場所での稼働時に後進走行する頻度がきわめて多いが、かかる後進走行時において人や物体への衝突事故を発生する割合が前進走行時よりもはるかに多い。
通常、バックアラームブザーは、一定の音圧の音を一定の周波数でフォークリフト後部に取り付けられたスピーカから発信して、車両後部や側部にいる人間に伝達し注意を促すようになっている。
【０００３】
【発明が解決しようとする課題】
かかるフォークリフトの稼働時において、車両と人や物体との衝突事故は、統計によれば、フォークリフトが前後進切換レバーを後進に切換えて後進走行を開始した直後の概ね５秒間程度の時間帯に、最も多く発生している。
この原因の一つとして、後進走行時にスピーカから発信されるバックアラームブザーは後進走行中常時一定の周波数かつ一定の音圧であるため、車両後部や側部にいる人間には耳慣れてしまい、後進開始直後と連続後進走行中との区別がつき難くなって、車両の走行方向が前進から後進に変化したことに対して格別な注意を払わなくなっていることがあげられる。
しかしながら、現状では、前記のような後進開始直後における事故発生原因に対する有効な解決策は提案されていないのが実情である。
【０００４】
本発明は、かかる従来技術の課題に鑑み、フォークリフト等の産業車両において、後進走行時に発信されるアラーム音の内容及び該アラーム音の発信手段を改良することにより、特に車両の後進開始直後における車両と人や物体との衝突事故の発生を防止し、安全な後進走行を実現できる産業車両のアラーム音発信装置を提供することを目的とする。
【０００５】
【課題を解決するための手段】
本発明はかかる課題を解決するため、請求項１記載の発明として、車両の後進走行時に前後進切換レバーの後進切換えに従いアラーム音を発生し、該アラーム音をスピーカを介して発信する産業車両のアラーム音発信装置において、前記車両の後進発走時点から一定期間、高周波数の高周波アラーム音を発生せしめて前記スピーカに送り、該高周波のアラーム音の前記スピーカからの発信後には前記高周波アラーム音よりも周波数の低い１種類または複数種類の低周波アラーム音を発生せしめて前記スピーカに送るアラーム音発生手段を備えたことを特徴とする産業車両のアラーム音発信装置を提案する。
【０００６】
請求項２記載の発明は、請求項１において、前記高周波アラーム音及び低周波アラーム音の前記スピーカからの発信時間を設定するタイマ装置と、該タイマ装置にて設定された時間中前記高周波アラーム音及び低周波アラーム音を連続的に発信する発振装置とよりなることを特徴とする。
請求項２において、好ましくは請求項３のように、前記タイマ装置は、前記発振装置に、前記高周波アラーム音を一定時間発信せしめた後、引き続き前記低周波アラーム音を発信せしめるように構成される。
【０００７】
かかる発明によれば、アラーム音発生手段を構成するタイマ装置と異なる周波数のアラーム音を発信する発振装置とを組み合わせて、車両の後進発走時点から前記タイマ装置にて設定された一定時間内には、最も高い周波数のアラーム音を前記発振装置からスピーカを介して発信し、該一定時間経過後は前記発振装置から従来と同様な比較的低周波数のアラーム音を発信して、後進走行時のアラーム音に周波数の変化をつけることにより聴覚上の変化をつけることができ、また、通常、車両と人や物体との衝突事故の発生頻度の最も多い後進発走直後の一定時間内には高周波数のアラーム音を発信することにより聴覚を強く刺激することができる。
これにより、アラーム音によって車両後部や側部にいる人間に注意を払わせることができて、車両の接近を確実に認知させることができ、車両と人との衝突事故の発生を減少することができる。
【０００８】
請求項４記載の発明は、車両の後進走行時に前後進切換レバーの後進切換えに従いアラーム音を発生し、該アラーム音をスピーカを介して発信する産業車両のアラーム音発信装置において、高周波数のアラーム音の周波数が個別にあるいは音圧と組み合わせて設定された高周波側周波数記憶手段と、前記高周波側周波数記憶手段の設定値よりも周波数の低い１種類または複数種類のアラーム音の周波数が個別にあるいは音圧と組み合わせて設定された低周波側周波数記憶手段と、前記前後進切換レバーの後進切換えとともに前記高周波側周波数記憶手段あるいは低周波側周波数記憶手段と前記アラーム音を発信する発振装置との接続を切換る周波数切換装置と、
車両の後進発走時点から一定時間、前記高周波側周波数記憶手段に記憶された高周波アラーム音を発生せしめてスピーカに送り、該高周波のアラーム音の前記スピーカからの発信後に前記周波数切換装置によりアラーム音を切り換えて前記低周波側周波数記憶手段に記憶された、前記高周波アラーム音よりも周波数の低い低周波アラーム音を発生せしめて、前記スピーカに送るアラーム音発信制御手段とを備えたことを特徴とする。
【０００９】
かかる発明によれば、周波数、音圧切換装置により高周波側周波数、音圧記憶手段側のアラーム音と、低周波側周波数、音圧記憶手段側のアラーム音との切換えが自在にでき、車両と人や物体との衝突事故の発生頻度が最も少なくなるようなアラーム音の発信態様を容易に選定することができ、車両の接近をより確実に認知させることができる。
【００１０】
請求項５記載の発明は、車両の後進走行時に前後進切換レバーの後進切換えに従いアラーム音を発生し、該アラーム音をスピーカを介して発信する産業車両のアラーム音発信装置において、前記アラーム音として前記車両の後進走行を通知する言語が設定された第一の言語記憶手段と、前記第一の言語記憶手段の設定値よりも周波数の低い言語が設定された第二の言語記憶手段と、前記前後進切換レバーの後進切換えとともに前記第一の言語記憶手段あるいは第二の言語記憶手段と前記アラーム音を発信するアラーム音発振装置との接続を切換る言語切換装置とを備え、
車両の後進発走時点から一定時間、前記第一の言語記憶手段に記憶された第一の言語のアラーム音を発生せしめてスピーカに送り、該第一の言語のアラーム音の前記スピーカからの発信後に前記言語切換装置によりアラーム音を切り換えて前記第二の言語記憶手段に記憶された、前記第二の言語のアラーム音を発生せしめて、前記スピーカに送るアラーム音発信制御手段とを備えたことを特徴とする。かかる発明によれば、高周波数でかつ車両の急接近を意味する言語と、低周波数のゆったりした口調の言語とを使い分けることにより、車両の急接近をリアルに車両後部や側部にいる人間に伝達できる。
【００１１】
請求項６記載の発明は、車両の後進走行時に前後進切換レバーの後進切換えに従いアラーム音を発生し、該アラーム音をスピーカを介して発信する産業車両のアラーム音発信装置において、第一のアラーム音として高周波数のアラーム音の周波数が個別にあるいは音圧と組み合わせて設定された高周波側周波数記憶手段と、前記高周波側周波数記憶手段の設定値よりも周波数の低い１種類または複数種類のアラーム音の周波数が個別にあるいは音圧と組み合わせて設定された低周波側周波数記憶手段と、前記前後進切換レバーの後進切換えとともに前記高周波側周波数記憶手段あるいは低周波側周波数記憶手段と前記アラーム音を発信する発振装置との接続を切換る周波数切換装置を備え、第二のアラーム音として前記車両の後進走行を通知する言語が設定された第一の言語記憶手段と、前記第一の言語記憶手段の設定値とは警告性の強さの異なる言語が設定された第二の言語記憶手段と、前記前後進切換レバーの後進切換えとともに前記第一の言語記憶手段あるいは第二の言語記憶手段と前記アラーム音を発信する発振装置との接続を切換る言語切換装置とを備え、さらに、前記第一アラーム音と前記第二のアラーム音の組合わせ同時発信及び交互切換え発信を行うアラーム音発信制御手段とを具え、
前記アラーム音発信制御手段により、車両の後進発走時点から一定期間、前記高周波側周波数記憶手段に記憶された高周波アラーム音を発生せしめてスピーカに送り、該高周波のアラーム音の前記スピーカからの発信後に前記周波数切換装置によりアラーム音を切り換えて前記低周波側周波数記憶手段に記憶された前記高周波アラーム音よりも周波数の低い低周波アラーム音を発生せしめて前記スピーカに送るように制御されていることを特徴とする。
かかる発明によれば、機械的アラーム音と言語的アラーム音を組み合わせて同時発信したり、交互に切り換えて発信することによって、より効果的に危機感を人間に認知させることが可能となる。
【００１２】
【発明の実施の形態】
以下、本発明を図に示した実施例を用いて詳細に説明する。但し、この実施例に記載されている構成部品の寸法、材質、形状、その相対配置などは特に特定的な記載がない限り、この発明の範囲をそれのみに限定する趣旨ではなく、単なる説明例にすぎない。
【００１３】
図１は本発明の第１実施例に係るフォークリフトにおけるアラーム音発信装置の制御ブロック図、図２は第２実施例に係るアラーム音発信装置を示す図１対応図、図３は第３実施例に係るアラーム音発信装置を示す図１対応図、図４は第４実施例に係るアラーム音発信装置を示す図１対応図、図５は前記第１実施例におけるアラーム音波形線図、図６は前記第２実施例におけるアラーム音波形線図、図７は本発明が適用されるフォークリフトの側面図である。
【００１４】
本発明が適用されるフォークリフトの全体構造を示す図７において、２０は車体、２１は荷物昇降用の昇降マスト、２２はフォーク、２３は操縦用ハンドル、２４はヘッドガード、２５は車輪、２６は運転席である。
１は車両の前進（Ｆ）、中立（Ｎ）、後進及び（Ｒ）を切換る前後進切換レバー、５は車体後部に取り付けられたスピーカで、前記前後進切換レバー１が後進に切換えられると、後述する手段によって前記スピーカ５からアラーム音が発信されるようになっている。
【００１５】
本発明は、前記フォークリフトの後進走行時に前記スピーカ５から発信されるアラーム音の発生及び発信制御手段に係るものであり、その第１実施例を示す図１において、１は前記前後進切換レバー、２は該前後進切換レバー１の後進切換と同時に後述するタイマ装置３の作動を指令するタイマ作動指令装置である。
３はタイマ装置で、後述する発振装置４ａ、４ｂ、４ｃ夫々の作動時間（アラーム音の発信時間）が設定されている。４ａ、４ｂ、４ｃは、夫々周波数あるいは周期の異なるアラーム音を発信する発振装置で、該発振装置４ａ、４ｂ、４ｃからのアラーム音が前記スピーカ５に伝送されるようになっている。
【００１６】
かかる構成からなるアラーム音の発生及び発信制御手段において、前記前後進切換レバー１を後進に切換ると、車両が後進走行を始めると同時に前記タイマ作動指令装置２がタイマ装置３にその作動を指令する。該タイマ装置３には前記発振装置４ａから発信されるアラーム音の発信継続時間、前記発振装置４ｂから発信されるアラーム音の発信継続時間、及び前記発振装置４ｃから発信されるアラーム音の発信継続時間が夫々連続して設定されている。
【００１７】
前記発振装置４ａにて発生し発信されるアラーム音は、図５（Ａ）に示されるように、その周期がＳ_１（従って周波数は１／Ｓ_１），音圧がＰ_１の高周波数のアラーム音で、このアラーム音が前記タイマ装置３により後進切換直後のｔ_１時間（ｔ_１＝５秒程度）発信される。
これに続いて前記タイマ装置３に設定されたｔ_２時間、図５（Ｂ）に示されるように、その周期がＳ_２（従って周波数は１／Ｓ_２），音圧がＰ_２の中間周波数のアラーム音が前記発振装置４ｂから発信される。
さらに続いて前記タイマ装置３にに設定されたｔ_３時間（後進走行終了まで）、図５（Ｃ）に示されるように、その周期がＳ_３（従って周波数は１／Ｓ_３），音圧がＰ_３の低周波数のアラーム音が前記発振装置４ｃから発信される。
これらのアラーム音は前記スピーカ５に伝達され、該スピーカ５からフォークリフトの周囲に発信される。
尚、前記発振装置４ａからの高周波数のアラーム音（図５（Ａ））の発信から、前記発振装置４ｃからの低周波数のアラーム音（図５（Ｃ））の発信に移り、前記発振装置４ｂからの中間周波数のアラーム音（図５（Ｂ））の発信は省略しても良い。
【００１８】
かかる実施例によれば、タイマ装置３と異なる周波数のアラーム音を発信する発振装置４ａ、４ｂ、４ｃとを組み合わせて、前記フォークリフトの前後進切換レバー１を後進に切換えて後進発走を始める時点から前記タイマ装置３にて設定された一定時間内には、最も高い周波数のアラーム音を前記発振装置からスピーカ５を介して発信し、該一定時間経過後は前記発振装置４ａ、４ｂ、４ｃから従来と同様な比較的低周波数のアラーム音を発信して、後進走行時のアラーム音に周波数の変化をつけることにより聴覚上の変化をつけることができ、また、通常、車両と人や物体との衝突事故の発生頻度の最も多い後進発走直後の一定時間内には高周波数のアラーム音を発信することにより、聴覚を強く刺激することができる。
これにより、アラーム音によって車両後部や側部にいる人間に注意を払わせることができて、車両の接近を確実に認知させることができ、車両と人との衝突事故の発生を減少することができる。
【００１９】
図２に示される第２実施例において、６はスピーカ５から発信されるアラーム音の周波数及び音圧を同時にあるいは個別に切換る周波数、音圧切換装置である。７ａ、７ｂ、７ｃは、夫々周波数（つまり周期）及び音圧の異なるアラーム音を記憶する周波数、音圧メモリで、周波数、音圧メモリ７ａが最も高い周波数、周波数、音圧メモリ７ｃが最も低い周波数、周波数、音圧メモリ７ｂが中間の周波数のアラーム音が、音圧と組み合わせて、あるいは前記夫々の周波数と音圧とが個別に記憶されている。８は前記アラーム音を発信する発振装置で、該発振装置８からのアラーム音が前記スピーカ５に伝送されるようになっている。
【００２０】
かかる第２実施例において、前記前後進切換レバー１を後進に切換ると、車両が後進走行を始めると同時に前記周波数、音圧切換装置６が作動する。
前記周波数、音圧メモリ７ａには、図６（Ａ）に示されるように、その周期がＳ_１（従って周波数は１／Ｓ_１），音圧がＰ_１１及びＰ_１２の高周波数のアラーム音が設定され、後進切換直後のｔ_１時間（ｔ_１＝５秒程度）前記周波数、音圧切換装置６により、該周波数、音圧メモリ７ａと前記発振装置８とが接続されると、該発振装置８より前記高周波数のアラーム音がｔ_１時間発信される。
【００２１】
また、前記周波数、音圧メモリ７ｂには、図６（Ｂ）に示されるように、その周期がＳ_２（従って周波数は１／Ｓ_２），音圧Ｐ_２１及びＰ_２２の中間周波数のアラーム音が設定され、前記周波数、音圧切換装置６により、該周波数、音圧メモリ７ｂと前記発振装置８とが接続されると、該発振装置８より前記中間周波数のアラーム音がｔ_２時間発信される。
さらに、前記周波数、音圧メモリ７ｃには、図６（Ｃ）に示されるように、その周期がＳ_３（従って周波数は１／Ｓ_３），音圧がＰ_３１の低周波数のアラーム音が設定され、前記周波数、音圧切換装置６により、該周波数、音圧メモリ７ｃと前記発振装置８とが接続されると、該発振装置８より前記低周波数のアラーム音がｔ_３時間発信される。
【００２２】
尚、発振装置８による、前記周波数、音圧メモリ７ａに記憶された高周波数のアラーム音（図６（Ａ））の発信から、前記周波数、音圧メモリ７ｃに記憶された低周波数のアラーム音（図６（Ｃ））の発信に移り、前記周波数、音圧メモリ７ｂに記憶された中間周波数のアラーム音（図６（Ｂ））の発信は省略しても良い。
【００２３】
かかる実施例によれば、周波数、音圧切換装置６により高周波側周波数、音圧記憶手段を構成する周波数、音圧メモリ７ａ側のアラーム音と、低周波側周波数、音圧記憶手段を構成する周波数、音圧メモリ７ｃ側（あるいは周波数、音圧メモリ７ｂ側）のアラーム音との切換えが自在にでき、車両と人や物体との衝突事故の発生頻度が最も少なくなるようなアラーム音の発信態様を容易に選定することができ、車両の接近をより確実に認知させることができる。
【００２４】
図３に示される第３実施例において、１０はアラーム音として車両の後進走行を人に通知する言語が、人に対して危険を強く警告し知覚させるように、高い周波数、早いテンポとリズム、強い音圧等の特徴を有する比較的強い警告性を発する音声言語で設定された第一の言語を記憶する第１の言語メモリ、１１は、アラーム音として車両の後進走行を人に通知する言語が、人に対して危険を比較的穏やかに警告し知覚させるように、前記第一言語メモリ１０の設定言語よりも比較的低い周波数、比較的遅めのテンポとリズム、比較的弱い音圧等の特徴を有する比較的穏やかな警告性を発する音声言語で設定された第２の言語メモリ、１２は前記スピーカ５に前記言語メモリ１０あるいは１１からの言語を発信する発振装置、９は前記言語メモリ１０あるいは１１と発振装置１２との接続を切換る言語切換装置である。
【００２５】
かかる第３実施例においては、前記前後進切換レバー１を後進に切換ると、車両が後進走行を始めると同時に前記言語切換装置９が作動して、該車両の後進発走時点から一定時間内において、第１の言語メモリ１０と発振装置１２とを接続する。これにより、該言語メモリ１０に記憶されている車両の急接近を意味する言語が高い周波数と速いいテンポ・リズムと強い音圧で発振装置１２を介してスピーカ５から発信される。
前記一定時間経過後は、前記言語切換装置９は比較的低く弱く遅めの言語が設定された第２の言語メモリ１１と発振装置１２とを接続し、比較的低い周波数と遅めのテンポ・リズムと弱い音圧の言語をスピーカ５から発信せしめる。
一般に人間は、一定の周波数やテンポ・リズムや音圧の音が連続して聞こえているとき、その音に対して注意力が散漫になり勝ちである。然るに、かかる実施例によれば、車両の急接近を意味する高い周波数と速いいテンポ、リズムと強い音圧の言語と、比較的低い周波数と遅めのテンポ・リズムと弱い音圧の言語とを使い分けることにより、注意力の散漫を抑制されるので、車両の急接近を持続的にリアルに車両後部や側部にいる人間に伝達できる。
【００２６】
図４に示される第４実施例においては、アラーム音発信制御装置６９が、機械的アラーム音を発信する機械的アラーム音発信システム６９１と言語的アラーム音を発信する言語的アラーム音発信システム６９２を制御する。前記機械的アラーム音発信システム６９１は、前記第２実施例における図２対応部分と同一、また前記言語的アラーム音発信システム６９２は、前記第３実施例の図３対応部分と同一であり、各構成要素は前記第２、第３実施例と同一の名称と符号が用いられている。かかる第４実施例によれば、機械的アラーム音と言語的アラーム音を組み合わせて同時発信したり、また交互に切り換えて発信したりすることができ、アラーム音発信パターンのバリエーションをさらに増加することが出来、その結果、より効果的に危機感を人間に認知させることを可能となる。
【００２７】
尚、本発明は、この実施例におけるフォークリフトに限らず、建設機械等、後進時にアラーム音を発信するシステムを備えた全ての産業車両に適用できる。
【００２８】
【発明の効果】
以上記載の如く請求項１ないし３の発明によれば、アラーム音発生手段を構成するタイマ装置と異なる周波数のアラーム音を発信する発振装置とを組み合わせることにより、車両の後進発走時点から一定時間内には、最も高い周波数のアラーム音をスピーカを介して発信し、該一定時間経過後は従来と同様な比較的低周波数のアラーム音を発信して、後進走行時のアラーム音に周波数の変化をつけることにより聴覚上の変化をつけることができ、また、通常、車両と人や物体との衝突事故の発生頻度の最も多い後進発走直後の一定時間内には高周波数のアラーム音を発信することにより聴覚を強く刺激することができる。
これにより、アラーム音によって車両後部や側部にいる人間に注意を払わせることができて、車両の接近を確実に認知させることができ、車両と人との衝突事故の発生を減少することができる。
【００２９】
また、請求項４の発明によれば、周波数、音圧切換装置により高周波側周波数、音圧記憶手段側のアラーム音と、低周波側周波数、音圧記憶手段側のアラーム音との切換えが自在にでき、車両と人や物体との衝突事故の発生頻度が最も少なくなるようなアラーム音の発信態様を容易に選定することができ、車両の接近をより確実に認知させることができる。
【００３０】
また、請求項５の発明によれば、高周波数でかつ車両の急接近を意味する言語と、低周波数のゆったりした口調の言語とを使い分けることにより、車両の急接近をリアルに車両後部や側部にいる人間に伝達できる。
さらに請求項６の発明によれば、機械的アラーム音と言語的アラーム音を組み合わせて同時発信したり、また交互に切り換えて発信したりすることができ、アラーム音発信パターンのバリエーションをさらに増やすことができるので、より効果的に危機感を人間に認知させることを可能とする。
【００３１】
要するに本発明によれば、車両の後進開始直後における車両と人や物体との衝突事故の発生を防止し、安全な後進走行を実現することができる。
【図面の簡単な説明】
【図１】本発明の第１実施例に係るフォークリフトにおけるアラーム音発信装置の制御ブロック図である。
【図２】第２実施例に係るアラーム音発信装置を示す図１対応図である。
【図３】第３実施例に係るアラーム音発信装置を示す図１対応図である。
【図４】第４実施例に係るアラーム音発信装置を示す図１対応図である。
【図５】前記第１実施例におけるアラーム音波形線図である。
【図６】前記第２実施例におけるアラーム音波形線図である。
【図７】本発明が適用されるフォークリフトの側面図である。
【符号の説明】
１前後進切換レバー
２タイマ作動指令装置
３タイマ装置
４ａ、４ｂ、４ｃ、８、１２発振装置
５スピーカ
６周波数、音圧切換装置
７ａ、７ｂ、７ｃ周波数、音圧メモリ
９言語切換装置
１０、１１言語メモリ
２０車体
２１昇降マスト
２３操縦用ハンドル
６９アラーム音発信制御装置[0001]
BACKGROUND OF THE INVENTION
The present invention is applied to industrial vehicles such as forklifts, construction machines, etc., and generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and transmits the alarm sound through a speaker. It relates to a transmitter.
[0002]
[Prior art]
Forklifts have a very high frequency of reverse travel when operating in factories and indoor and outdoor cargo handling places, but the rate of collisions with people and objects during such reverse travel is much greater than during forward travel.
Usually, the back alarm buzzer transmits a sound of a constant sound pressure at a constant frequency from a speaker attached to the rear part of the forklift and transmits it to a person at the rear part or the side part of the vehicle to call attention.
[0003]
[Problems to be solved by the invention]
During the operation of such a forklift, according to statistics, a collision accident between a vehicle and a person or an object is approximately 5 seconds immediately after the forklift starts moving backward by switching the forward / reverse switching lever to reverse, The most common occurrence.
One reason for this is that the back alarm buzzer emitted from the speaker during reverse travel has a constant frequency and constant sound pressure during reverse travel. It becomes difficult to distinguish between immediately after starting and during continuous reverse travel, and it is possible to pay special attention to the fact that the travel direction of the vehicle has changed from forward to reverse.
However, at present, no effective solution has been proposed for the cause of the occurrence of an accident immediately after the start of reverse as described above.
[0004]
In view of the problems of the prior art, the present invention improves the contents of the alarm sound transmitted during reverse travel and the means for transmitting the alarm sound in industrial vehicles such as forklifts. An object of the present invention is to provide an alarm sound transmission device for an industrial vehicle that can prevent a collision accident between the vehicle and a person or an object and can realize a safe reverse travel.
[0005]
[Means for Solving the Problems]
In order to solve such a problem, the present invention provides an industrial vehicle according to claim 1 that generates an alarm sound in accordance with reverse switching of a forward / reverse switching lever during reverse traveling of the vehicle and transmits the alarm sound through a speaker. In the alarm sound transmitting device, a high-frequency high-frequency alarm sound is generated and sent to the speaker for a certain period from the time of the backward start of the vehicle, and after the high-frequency alarm sound is transmitted from the speaker, The present invention proposes an alarm sound transmitting device for an industrial vehicle characterized by comprising alarm sound generating means for generating one or a plurality of types of low frequency alarm sounds having a low frequency and sending them to the speaker.
[0006]
According to a second aspect of the present invention, in the first aspect, the timer device for setting the transmission time of the high frequency alarm sound and the low frequency alarm sound from the speaker, and the high frequency alarm sound during the time set by the timer device. And an oscillation device for continuously transmitting a low frequency alarm sound.
In claim 2, preferably, as in claim 3, the timer device is configured to cause the oscillation device to transmit the high-frequency alarm sound for a certain period of time, and then continuously transmit the low-frequency alarm sound. .
[0007]
According to this invention, the timer device that constitutes the alarm sound generating means and the oscillation device that emits an alarm sound having a different frequency are combined, and within a certain time set by the timer device from the backward start time of the vehicle. An alarm sound of the highest frequency is transmitted from the oscillation device through a speaker, and after the predetermined time has elapsed, an alarm sound of a relatively low frequency similar to that of the prior art is transmitted from the oscillation device, so that an alarm is generated during reverse travel. By changing the frequency of the sound, it is possible to make an auditory change, and in general, a high frequency is required within a certain period of time immediately after the reverse start with the highest frequency of collision accidents between the vehicle and people or objects. By transmitting an alarm sound, it is possible to strongly stimulate hearing.
As a result, it is possible to alert the person at the rear or side of the vehicle with the alarm sound, to make sure that the approach of the vehicle is recognized, and to reduce the occurrence of a collision accident between the vehicle and the person. it can.
[0008]
According to a fourth aspect of the present invention, there is provided an alarm sound transmission device for an industrial vehicle that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and transmits the alarm sound through a speaker. and the high-frequency side frequency storage unit frequency which is set in combination with individually or sound pressure of the sound, the frequency of the high frequency side frequency one lower frequency than the set value storage unit or a plurality of types of alarm sound individually or in originating and low-frequency side frequency storage means being set in combination with the sound pressure, the high-frequency side frequency storing means or the low-frequency side frequency numbers憶means and said alarm sound with reverse switching of the forward-reverse switching lever and Setsu換Ru frequency switching device connected between the oscillation apparatus,
A high-frequency alarm sound stored in the high-frequency side frequency storage means is generated for a certain period from the time when the vehicle starts moving backward, and is sent to the speaker. After the high-frequency alarm sound is transmitted from the speaker, the frequency switching device generates an alarm sound. An alarm sound transmission control means for generating a low-frequency alarm sound having a frequency lower than that of the high-frequency alarm sound, which is switched and stored in the low-frequency side frequency storage means, and sending the low-frequency alarm sound to the speaker. .
[0009]
According to this invention, the frequency and sound pressure switching device can freely switch between the alarm sound on the high frequency side and the sound pressure storage means side and the alarm sound on the low frequency side and the sound pressure storage means side. It is possible to easily select an alarm sound transmission mode that minimizes the frequency of occurrence of a collision accident with a person or an object, and to recognize the approach of the vehicle more reliably.
[0010]
According to a fifth aspect of the present invention, in the alarm sound transmission device for an industrial vehicle that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and transmits the alarm sound through a speaker, the alarm sound is used as the alarm sound. A first language storage means in which a language for notifying reverse travel of the vehicle is set; a second language storage means in which a language having a frequency lower than a set value of the first language storage means is set; A language switching device for switching connection between the first language storage means or the second language storage means and the alarm sound oscillation device for transmitting the alarm sound together with reverse switching of the forward / reverse switching lever;
After a predetermined time from the time when the vehicle starts moving backward, the first language alarm sound stored in the first language storage means is generated and sent to the speaker, and the alarm sound of the first language is transmitted from the speaker. Alarm sound transmission control means for switching the alarm sound by the language switching device and generating the alarm sound of the second language stored in the second language storage means and sending it to the speaker. Features. According to such an invention, by using a high-frequency language meaning a sudden approach of a vehicle and a low-frequency language with a relaxed tone, the sudden approach of the vehicle can be realistically detected by a person at the rear or side of the vehicle. Can communicate.
[0011]
According to a sixth aspect of the present invention, in the alarm sound transmission device for an industrial vehicle, an alarm sound is generated in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and the alarm sound is transmitted via a speaker. and the high-frequency side frequency storage means frequency of the high frequency of the alarm sound that is set in combination with individually or sound pressure as a sound, of one or more types lower frequency than the set value of the high-frequency side frequency storage means a low frequency side frequency storage means the frequency of the alarm sound that is set in combination with individually or sound pressure, and the high-frequency side frequency storing means or the low-frequency side frequency storage means together with reverse switching of the forward-reverse switching lever the connection between the oscillation unit originating the alarm comprises a Setsu換Ru frequency switching device, notifies the reverse travel of the vehicle as a second alarm A first language storage means in which a language to be set is set, a second language storage means in which a language having a warning strength different from a set value of the first language storage means, and the forward / reverse switching A language switching device for switching the connection between the first language storage means or the second language storage means and the oscillation device for transmitting the alarm sound together with the reverse switching of the lever, and further comprising the first alarm sound and the Alarm sound transmission control means for performing simultaneous transmission and alternate switching transmission of the second alarm sound,
The alarm sound transmission control means generates a high-frequency alarm sound stored in the high-frequency side frequency storage means for a certain period from the reverse start time of the vehicle, sends it to the speaker, and after the high-frequency alarm sound is transmitted from the speaker It is controlled to switch the alarm sound by the frequency switching device to generate a low frequency alarm sound having a frequency lower than the high frequency alarm sound stored in the low frequency side frequency storage means and send it to the speaker. Features.
According to this invention, it is possible to make a human sense of crisis more effectively by transmitting a combination of a mechanical alarm sound and a linguistic alarm sound at the same time or alternately switching and transmitting them.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this example are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Only.
[0013]
FIG. 1 is a control block diagram of an alarm sound transmitting device in a forklift according to a first embodiment of the present invention, FIG. 2 is a diagram corresponding to FIG. 1 showing an alarm sound transmitting device according to a second embodiment, and FIG. 3 is a third embodiment. FIG. 4 is a diagram corresponding to FIG. 1 illustrating an alarm sound transmitting device according to the fourth embodiment, FIG. 5 is an alarm sound waveform diagram according to the first embodiment, and FIG. Is an alarm sound waveform diagram in the second embodiment, and FIG. 7 is a side view of a forklift to which the present invention is applied.
[0014]
In FIG. 7 showing the overall structure of a forklift to which the present invention is applied, 20 is a vehicle body, 21 is a lifting mast for lifting and lowering luggage, 22 is a fork, 23 is a steering handle, 24 is a head guard, 25 is a wheel, and 26 is The driver's seat.
1 is a forward / reverse switching lever for switching forward (F), neutral (N), reverse and (R) of the vehicle, and 5 is a speaker attached to the rear part of the vehicle body. When the forward / reverse switching lever 1 is switched to reverse, An alarm sound is transmitted from the speaker 5 by means to be described later.
[0015]
The present invention relates to the generation and transmission control means of an alarm sound transmitted from the speaker 5 during reverse travel of the forklift. In FIG. 1 showing the first embodiment, reference numeral 1 denotes the forward / reverse switching lever, Reference numeral 2 denotes a timer operation command device that commands the operation of a timer device 3 to be described later simultaneously with reverse switching of the forward / reverse switching lever 1.
Reference numeral 3 denotes a timer device, in which operating times (time for transmitting alarm sounds) of oscillation devices 4a, 4b, and 4c described later are set. Reference numerals 4a, 4b, and 4c denote oscillation devices that emit alarm sounds having different frequencies or periods, and the alarm sounds from the oscillation devices 4a, 4b, and 4c are transmitted to the speaker 5.
[0016]
In the alarm sound generation and transmission control means having such a configuration, when the forward / reverse switching lever 1 is switched to reverse, the timer operation command device 2 instructs the timer device 3 to operate when the vehicle starts traveling backward. To do. In the timer device 3, the alarm sound transmission duration time from the oscillation device 4a, the alarm sound transmission duration time from the oscillation device 4b, and the alarm sound transmission time from the oscillation device 4c are continued. Each time is set continuously.
[0017]
As shown in FIG. 5A, the alarm sound generated and transmitted by the oscillation device 4a has a high frequency with a period of S ₁ (and therefore a frequency of 1 / S ₁ ) and a sound pressure of P ₁ . This alarm sound is transmitted by the timer device 3 for t ₁ time (t ₁ = about 5 seconds) immediately after reverse switching.
This is followed by t ₂ time set in the timer device 3, and as shown in FIG. 5 (B), the cycle is S ₂ (and hence the frequency is 1 / S ₂ ), and the sound pressure is the intermediate frequency P ₂ . The alarm sound is transmitted from the oscillation device 4b.
Subsequently, t ₃ hours (until the end of reverse travel) set in the timer device 3, the cycle is S ₃ (and hence the frequency is 1 / S ₃ ), and the sound pressure, as shown in FIG. 5C. There low frequency alarm sound P ₃ is transmitted from the oscillator 4c.
These alarm sounds are transmitted to the speaker 5 and transmitted from the speaker 5 around the forklift.
Incidentally, the transmission of the high frequency alarm sound (FIG. 5 (A)) from the oscillation device 4a shifts to the transmission of the low frequency alarm sound (FIG. 5 (C)) from the oscillation device 4c. The transmission of the intermediate frequency alarm sound (FIG. 5B) from 4b may be omitted.
[0018]
According to this embodiment, the timer device 3 is combined with the oscillation devices 4a, 4b, and 4c that transmit alarm sounds having different frequencies, and the forklift forward / reverse switching lever 1 is switched to the reverse to start the reverse start. Within a predetermined time set by the timer device 3, an alarm sound having the highest frequency is transmitted from the oscillating device through the speaker 5, and after the lapse of the predetermined time, the oscillating devices 4a, 4b, and 4c are conventional. A similar low-frequency alarm sound can be transmitted, and a change in frequency can be applied to the alarm sound during reverse travel. Hearing can be strongly stimulated by transmitting a high-frequency alarm sound within a certain period of time immediately after reverse running with the highest frequency of collision accidents.
As a result, it is possible to alert the person at the rear or side of the vehicle with the alarm sound, to make sure that the approach of the vehicle is recognized, and to reduce the occurrence of a collision accident between the vehicle and the person. it can.
[0019]
In the second embodiment shown in FIG. 2, reference numeral 6 denotes a frequency / sound pressure switching device that switches the frequency and sound pressure of the alarm sound transmitted from the speaker 5 simultaneously or individually. Reference numerals 7a, 7b, and 7c denote frequencies and sound pressure memories for storing alarm sounds having different frequencies (that is, cycles) and sound pressures, respectively. The frequency and sound pressure memory 7a are the highest, and the frequency and sound pressure memory 7c are the lowest. In the frequency, frequency and sound pressure memory 7b, an alarm sound having an intermediate frequency is stored in combination with the sound pressure, or the respective frequency and sound pressure are individually stored. Reference numeral 8 denotes an oscillating device for transmitting the alarm sound, and the alarm sound from the oscillating device 8 is transmitted to the speaker 5.
[0020]
In the second embodiment, when the forward / reverse switching lever 1 is switched to reverse, the frequency / sound pressure switching device 6 is activated simultaneously with the start of reverse travel of the vehicle.
In the frequency / sound pressure memory 7a, as shown in FIG. 6A, a high-frequency alarm sound having a cycle of S ₁ (and hence a frequency of 1 / S ₁ ) and a sound pressure of P ₁₁ and P ₁₂ is used. Is set, and t ₁ time immediately after reverse switching (t ₁ = about 5 seconds) When the frequency / sound pressure memory 7a and the oscillator 8 are connected by the frequency / sound pressure switching device 6, the oscillation The high frequency alarm sound is transmitted from the device 8 for t ₁ hour.
[0021]
Further, as shown in FIG. 6B, the frequency / sound pressure memory 7b has an alarm of an intermediate frequency of S ₂ (and hence the frequency is 1 / S ₂ ) and sound pressures P ₂₁ and P ₂₂ as shown in FIG. the sound is set, the frequency, the sound pressure switching unit 6, the frequency, the sound pressure memory 7b and the oscillator 8 is connected, the alarm sound is t ₂ hours calling of the intermediate frequency from the oscillating device 8 Is done.
Further, in the frequency / sound pressure memory 7c, as shown in FIG. 6 (C), a low-frequency alarm sound having a cycle of S ₃ (and hence a frequency of 1 / S ₃ ) and a sound pressure of P ₃₁ is displayed. set, by the frequency, the sound pressure switching unit 6, when the frequency is the sound pressure memory 7c and the oscillator 8 is connected, the more oscillation device 8 low frequency alarm sound is issued t ₃ hours .
[0022]
Incidentally, from the transmission of the high frequency alarm sound (FIG. 6A) stored in the frequency / sound pressure memory 7a by the oscillation device 8, the low frequency alarm sound stored in the frequency / sound pressure memory 7c. Moving to the transmission of (FIG. 6C), the transmission of the alarm sound of the intermediate frequency (FIG. 6B) stored in the frequency and sound pressure memory 7b may be omitted.
[0023]
According to this embodiment, the frequency and sound pressure switching device 6 constitutes the high frequency side frequency, the frequency constituting the sound pressure storage means, the alarm sound on the sound pressure memory 7a side, the low frequency side frequency, and the sound pressure storage means. It is possible to freely switch between the alarm sound on the frequency and sound pressure memory 7c side (or on the frequency and sound pressure memory 7b side), and to send an alarm sound that minimizes the frequency of collision accidents between the vehicle and people or objects. An aspect can be selected easily and the approach of a vehicle can be recognized more reliably.
[0024]
In the third embodiment shown in FIG. 3, 10 is a high-frequency, fast tempo and rhythm, so that the language for notifying the person of the reverse running of the vehicle as an alarm sound strongly warns and perceives the danger to the person. A first language memory for storing a first language set in a spoken language that emits a relatively strong warning having characteristics such as strong sound pressure, and 11 is a language for notifying a person of the backward running of the vehicle as an alarm sound. However, a relatively low frequency, a relatively slow tempo and rhythm, a relatively weak sound pressure, etc., than the set language of the first language memory 10 so as to warn and perceive danger relatively gently to a person. A second language memory set in a spoken language that emits a comparatively mild warning characteristic, characterized by the following: 12 is an oscillation device that transmits the language from the language memory 10 or 11 to the speaker 5, and 9 is the language memo 10 or 11 and the connection between the oscillator 12 is Setsu換Ru language switching device.
[0025]
In the third embodiment, when the forward / reverse switching lever 1 is switched to the reverse travel, the language switching device 9 is activated at the same time as the vehicle starts the reverse travel, and within a predetermined time from the reverse travel time of the vehicle. The first language memory 10 and the oscillation device 12 are connected. As a result, a language meaning a sudden approach of the vehicle stored in the language memory 10 is transmitted from the speaker 5 via the oscillation device 12 with a high frequency, a fast tempo rhythm, and a strong sound pressure.
After the lapse of the predetermined time, the language switching device 9 connects the second language memory 11 in which a relatively low, weak and slow language is set and the oscillation device 12 so as to connect a relatively low frequency and a slow tempo. The language of rhythm and weak sound pressure is transmitted from the speaker 5.
In general, when a sound with a constant frequency, tempo rhythm, or sound pressure is continuously heard, a person tends to be distracted by his / her attention. However, according to such an embodiment, a high frequency, fast tempo, rhythm and strong sound pressure language signifying a sudden approach of the vehicle, a relatively low frequency, slow tempo rhythm and weak sound pressure language, By properly using, the distraction of attention is suppressed, so that the sudden approach of the vehicle can be continuously and realistically transmitted to the person at the rear or side of the vehicle.
[0026]
In the fourth embodiment shown in FIG. 4, the alarm sound transmission control device 69 includes a mechanical alarm sound transmission system 691 for transmitting a mechanical alarm sound and a linguistic alarm sound transmission system 692 for transmitting a linguistic alarm sound. Control. The mechanical alarm sound transmission system 691 is the same as the corresponding part in FIG. 2 in the second embodiment, and the linguistic alarm sound transmission system 692 is the same as the corresponding part in FIG. 3 in the third embodiment. Constituent elements have the same names and symbols as in the second and third embodiments. According to the fourth embodiment, a combination of a mechanical alarm sound and a linguistic alarm sound can be simultaneously transmitted or alternately switched to be transmitted, and the variation of the alarm sound transmission pattern can be further increased. As a result, it is possible to make humans recognize the sense of crisis more effectively.
[0027]
In addition, this invention is applicable not only to the forklift in this Example but all industrial vehicles provided with the system which transmits an alarm sound at the time of reverse drive, such as a construction machine.
[0028]
【The invention's effect】
As described above, according to the first to third aspects of the present invention, the combination of the timer device constituting the alarm sound generating means and the oscillation device for transmitting an alarm sound having a different frequency allows the vehicle to travel within a certain period of time from the reverse start time of the vehicle. In this case, the alarm sound with the highest frequency is transmitted through the speaker, and after a certain period of time, an alarm sound with a relatively low frequency similar to the conventional one is transmitted to change the frequency of the alarm sound during reverse running. It is possible to change the hearing by turning it on, and usually, a high-frequency alarm sound is sent within a certain period of time immediately after the reverse start with the highest frequency of collision accidents between the vehicle and people or objects. Can strongly stimulate hearing.
As a result, it is possible to alert the person at the rear or side of the vehicle with the alarm sound, to make sure that the approach of the vehicle is recognized, and to reduce the occurrence of a collision accident between the vehicle and the person. it can.
[0029]
According to the invention of claim 4, the frequency / sound pressure switching device can freely switch between the alarm sound on the high frequency side and sound pressure storage means and the alarm sound on the low frequency side and sound pressure storage means side. Therefore, it is possible to easily select an alarm sound transmission mode in which the occurrence frequency of collision accidents between the vehicle and a person or an object is minimized, and the vehicle approach can be recognized more reliably.
[0030]
Further, according to the invention of claim 5, by using a high-frequency language meaning a sudden approach of the vehicle and a low-frequency language with a relaxed tone, the sudden approach of the vehicle can be realistically realized at the rear or side of the vehicle. Can communicate to people in the department.
Furthermore, according to the invention of claim 6, a combination of a mechanical alarm sound and a linguistic alarm sound can be transmitted simultaneously, or alternately switched to be transmitted, and the variation of the alarm sound transmission pattern can be further increased. It is possible to make humans recognize the sense of crisis more effectively.
[0031]
In short, according to the present invention, it is possible to prevent the occurrence of a collision accident between the vehicle and a person or an object immediately after the start of reverse travel of the vehicle, and to realize safe reverse travel.
[Brief description of the drawings]
FIG. 1 is a control block diagram of an alarm sound transmitting device in a forklift according to a first embodiment of the present invention.
FIG. 2 is a block diagram corresponding to FIG. 1 showing an alarm sound transmission device according to a second embodiment;
FIG. 3 is a block diagram corresponding to FIG. 1 showing an alarm sound transmitter according to a third embodiment;
FIG. 4 is a block diagram corresponding to FIG. 1 showing an alarm sound transmitter according to a fourth embodiment;
FIG. 5 is an alarm sound waveform diagram in the first embodiment.
FIG. 6 is an alarm sound waveform diagram in the second embodiment.
FIG. 7 is a side view of a forklift to which the present invention is applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Forward / reverse switching lever 2 Timer operation command device 3 Timer devices 4a, 4b, 4c, 8, 12 Oscillator 5 Speaker 6 Frequency, sound pressure switching devices 7a, 7b, 7c Frequency, sound pressure memory 9 Language switching devices 10, 11 Language memory 20 Car body 21 Elevating mast 23 Steering handle 69 Alarm sound transmission control device

Claims

An alarm sound transmitting device for an industrial vehicle that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever during reverse traveling of the vehicle and transmits the alarm sound through a speaker. The high-frequency alarm sound is generated and sent to the speaker. After the high-frequency alarm sound is transmitted from the speaker, one or more types of low-frequency alarm sounds having a frequency lower than that of the high-frequency alarm sound are generated and the high-frequency alarm sound is generated. An alarm sound transmitting device for an industrial vehicle, comprising alarm sound generating means for sending to a speaker.

The alarm sound generating means is configured to set a time for transmitting the high-frequency alarm sound and the low-frequency alarm sound from the speaker, and the high-frequency alarm sound and the low-frequency alarm sound during the time set by the timer apparatus. 2. The alarm sound transmitting device for an industrial vehicle according to claim 1, further comprising an oscillating device for continuously transmitting.

3. The industrial vehicle according to claim 2, wherein the timer device is configured to continuously transmit the low-frequency alarm sound after transmitting the high-frequency alarm sound to the oscillation device for a predetermined time. Alarm sound transmitter.

In an industrial vehicle alarm sound transmission device that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and transmits the alarm sound through a speaker, the frequency of the high-frequency alarm sound is individually or set in combination with the high-frequency side frequency storage means being set in combination with the pressure, and frequency separately or sound pressure of the high-frequency side frequency one lower frequency than the set value storage unit or a plurality of types of alarm sound a low frequency side frequency storage unit that is, switching the connection between the oscillation unit originating the high frequency side frequency storing means or the low-frequency side frequency numbers憶means and said alarm sound with reverse switching of the forward-reverse switching lever and frequency switching device that,
A high-frequency alarm sound stored in the high-frequency side frequency storage means is generated for a certain period from the time when the vehicle starts moving backward, and is sent to the speaker. After the high-frequency alarm sound is transmitted from the speaker, the frequency switching device generates an alarm sound. An alarm sound transmission control means for generating a low-frequency alarm sound having a frequency lower than that of the high-frequency alarm sound, which is switched and stored in the low-frequency side frequency storage means, and sending the low-frequency alarm sound to the speaker. Alarm sound transmitter for industrial vehicles.

In an alarm sound transmission device for an industrial vehicle that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever when the vehicle is traveling backward, and transmits the alarm sound via a speaker, the backward traveling of the vehicle is notified as the alarm sound. A first language storage means in which a language is set, a second language storage means in which a language having a frequency lower than the set value of the first language storage means, and reverse switching of the forward / reverse switching lever A language switching device for switching connection between the first language storage means or the second language storage means and the alarm sound oscillation device for transmitting the alarm sound;
After a predetermined time from the time when the vehicle starts moving backward, the first language alarm sound stored in the first language storage means is generated and sent to the speaker, and the alarm sound of the first language is transmitted from the speaker. Alarm sound transmission control means for switching the alarm sound by the language switching device and generating the alarm sound of the second language stored in the second language storage means and sending it to the speaker. An industrial vehicle alarm sound transmitter.

In an industrial vehicle alarm sound transmission device that generates an alarm sound in accordance with the reverse switching of the forward / reverse switching lever during reverse travel of the vehicle and transmits the alarm sound through a speaker, a high-frequency alarm sound is generated as the first alarm sound. and the high-frequency side frequency storage unit frequency which is set in combination with individually or sound pressure, frequency of the high frequency side frequency one lower frequency than the set value storage unit or a plurality of types of alarm sound or separately a low frequency side frequency storage means being set in combination with the sound pressure, an oscillation unit originating the alarm sound and the high frequency side frequency storing means or the low-frequency side frequency storage means together with reverse switching of the forward-reverse switching lever comprising a Setsu換Ru frequency switching device a connection with, the language for notifying the reverse travel of the vehicle as the second alarm is set The language storage means, the second language storage means in which a language having a different warning strength is set from the set value of the first language storage means, and the reverse switching of the forward / reverse switching lever and the first A language switching device for switching connection between the language storage means or the second language storage means and the oscillation device for transmitting the alarm sound, and further, a combination of the first alarm sound and the second alarm sound With alarm sound transmission control means to perform simultaneous transmission and alternate switching transmission,
The alarm sound transmission control means generates a high-frequency alarm sound stored in the high-frequency side frequency storage means for a certain period from the reverse start time of the vehicle, sends it to the speaker, and after the high-frequency alarm sound is transmitted from the speaker It is controlled to switch the alarm sound by the frequency switching device to generate a low frequency alarm sound having a frequency lower than the high frequency alarm sound stored in the low frequency side frequency storage means and send it to the speaker. An industrial vehicle alarm sound transmitter.