JP3989478B2

JP3989478B2 - Loading platform lifting device

Info

Publication number: JP3989478B2
Application number: JP2004250473A
Authority: JP
Inventors: 良和堀之内; 威古川
Original assignee: Shinmaywa Industries Ltd
Current assignee: Shinmaywa Industries Ltd
Priority date: 2004-08-30
Filing date: 2004-08-30
Publication date: 2007-10-10
Anticipated expiration: 2024-08-30
Also published as: JP2006062607A

Description

本発明は、車両の荷台に対する荷物の積込み・積卸し作業を支援する荷受台昇降装置に関する。 The present invention relates to a load receiving table lifting / lowering device that supports loading / unloading work of a load on a loading platform of a vehicle.

荷受台昇降装置は、車両の荷台に対する荷物積込み・積卸し作業を支援するものであり、従来より種々の技術が提唱されている。この荷受台昇降装置の一例として、リンク機構を介し車両の荷台と地面との間を昇降する荷受台と、この荷受台を荷台の後面に沿って起立する閉塞状態又は略水平に倒伏する開放状態まで回動する開閉機構と、開閉スイッチ、上昇スイッチ、及び下降スイッチを有する荷台外側操作装置と、上昇スイッチ及び下降スイッチを有する荷台内側操作装置と、運転席に設けられ荷台外側操作装置及び荷台内側操作装置の電源をＯＮ・ＯＦＦ状態に切換え可能なメインスイッチとを備えた荷受台昇降装置が開示されている（例えば、特許文献１参照）。この従来技術では、荷台外側操作装置（又は荷台内側操作装置）の上昇スイッチを単独操作すると、荷台を上昇させ、荷台外側操作装置（又は荷台内側操作装置）の下降スイッチを単独操作すると、荷台を下降させるようになっている。また、荷台外側操作装置の開閉スイッチと上昇スイッチを複数操作すると、荷受台を閉塞状態へ回動させ（閉じ）、荷台外側操作装置の開閉スイッチと下降スイッチを複数操作すると、荷受台を開放状態へ回動させる（開く）ようになっている。 The loading platform lifting device supports loading and unloading operations on a loading platform of a vehicle, and various techniques have been proposed conventionally. As an example of this load receiving platform lifting device, a load receiving platform that moves up and down between the vehicle loading platform and the ground via a link mechanism, and a closed state in which the load receiving platform stands along the rear surface of the loading platform or an open state in which the load receiving platform is tilted substantially horizontally. Opening / closing mechanism that rotates to the right, a loading platform outer side operation device having an opening / closing switch, a raising switch, and a lowering switch, a loading platform inner side operation device having a raising switch and a lowering switch, a loading platform outer side operation device and a loading platform inner side provided in the driver's seat There has been disclosed a cargo receiving platform lifting device including a main switch capable of switching the power supply of an operation device to an ON / OFF state (see, for example, Patent Document 1). In this prior art, when the lifting switch of the loading platform outer operation device (or loading platform inner operation device) is operated alone, the loading platform is raised, and when the lowering switch of the loading platform outer operation device (or loading platform inner operation device) is operated alone, It is designed to be lowered. In addition, if you operate multiple open / close switches and lift switches on the loading platform outer operation device, the loading platform is turned to the closed state (closed), and if you operate multiple opening / closing switches and lowering switches on the loading platform outside operation device, the loading platform is opened. It is designed to rotate (open).

特開２００１−６３４４３号公報JP 2001-63443 A

しかしながら、上記従来技術には以下のような改善の余地がある。
すなわち、上述した荷台外側操作装置は、３つのスイッチ（開閉スイッチ、上昇スイッチ、及び下降スイッチ）の単独操作又は複数操作により、４つの荷受台の動作（上昇、下降、閉じ、開き）を指示可能とし、その操作指令信号をケーブルを介し出力するようになっている。そのため、ケーブル長さにより操作装置の移動範囲が制限されてしまい、必要に応じて荷台外側及び荷台内側にそれぞれ操作装置を設ける必要があった。また、たとえケーブルを比較的長いものとしても、荷物積込み・積卸しの作業前にケーブルを引廻したり、作業後にケーブルを収納したりする手間を要し、操作者に対し煩わしさを与えるだけでなく、ケーブルの収納スペースを考慮する必要があった。 However, there is room for improvement in the prior art described above.
In other words, the above-described loading platform outer side operation device can instruct the operation (raising, lowering, closing, opening) of the four loading platforms by single operation or multiple operations of the three switches (open / close switch, lift switch, and drop switch). The operation command signal is output via a cable. Therefore, the movement range of the operating device is limited by the cable length, and it is necessary to provide operating devices on the outer side and the inner side of the cargo bed as necessary. In addition, even if the cable is relatively long, it takes time to route the cable before loading and unloading work, and to store the cable after the work. It was necessary to consider the storage space for the cable.

本発明は、上記の事柄に基づいてなされたものであり、その目的は、操作移動範囲を拡大し、作業効率の向上を図ることができる荷受台昇降装置を提供することにある。 The present invention has been made based on the above matters, and an object of the present invention is to provide a load receiving table lifting / lowering device capable of expanding an operation movement range and improving work efficiency.

（１）上記目的を達成するために、本発明は、車両の荷台に対する荷物積込み・積卸し作業を支援する荷受台昇降装置において、前記車両の荷台と地上との間を昇降する少なくとも１つの荷受台と、前記荷受台の動作一方向及び動作他方向をそれぞれ指示可能な２つの作動スイッチ、この作動スイッチとの複数操作により前記荷受台の動作内容の切換えを指示可能な少なくとも１つの切換スイッチを有し、前記荷受台を遠隔操作する無線信号を送信する操作装置と、車両側に設けられ、前記操作装置からの無線信号を受信して対応する操作指令信号を出力する受信機とを備え、前記受信機は、前記切換スイッチの操作を継続して前記作動スイッチとの複数操作に切換えた場合、前記切換スイッチによる前記荷受台の動作内容切換えの指示を有効として、前記切換スイッチと前記作動スイッチとの複数操作に対応する操作指令信号を出力し、前記作動スイッチの単独操作中に前記作動スイッチと前記切換スイッチとの複数操作に切換えた場合、前記切換スイッチによる前記荷受台の動作内容切換えの指示を無効として、前記作動スイッチの単独操作に対応する操作指令信号の出力を継続する動作切換無効手段を備える。 (1) In order to achieve the above object, the present invention provides a load receiving platform lifting / lowering device that supports loading / unloading operations of a load on a vehicle loading platform, at least one load receiving / lifting between the loading platform of the vehicle and the ground. And at least one change-over switch capable of instructing switching of the operation content of the load receiving base by a plurality of operations with the operation switch. An operation device that transmits a radio signal for remotely operating the cargo receiving table, and a receiver that is provided on a vehicle side and that receives a radio signal from the operation device and outputs a corresponding operation command signal, When the receiver continues to operate the changeover switch and switches to a plurality of operations with the operation switch, the receiver has an instruction to change the operation content of the load receiving platform by the changeover switch. As the case of outputting an operation command signal corresponding to the plural operating the change-over switch and said operating switch, is switched to plural operating between the changeover switch and the activation switch during the single operation of the operating switch, the change-over switch The operation switching invalidating means for continuing the output of the operation command signal corresponding to the single operation of the operation switch while invalidating the instruction for switching the operation content of the cargo receiving table by the above.

操作装置における作動スイッチの単独操作、作動スイッチと切換スイッチの複数操作の切換えにおいては、操作者が意図して行う場合もあるが、そうでない場合もある。すなわち、例えば切換スイッチの単独操作中に作動スイッチを操作して、切換スイッチの単独操作から切換スイッチと作動スイッチの複数操作に切換える場合は、操作者が意図して行うものであり、停止状態の荷受台を動作させるので特に問題はない。一方、例えば作動スイッチの単独操作中に何らかの理由で切換スイッチを操作してしまい、不用意に作動スイッチの単独操作から作動スイッチと切換スイッチの複数操作にかわる場合は、操作者の予想しない方向に荷受台が動作変更してしまい、大変危険であった。そこで本発明においては、作動スイッチの単独操作中に作動スイッチと切換スイッチの複数操作に切換えた場合、動作切換無効手段で切換スイッチによる荷受台の動作内容の切換えを無効とし、例えば作動スイッチの単独操作による荷受台の動作を維持する。これにより、操作者が意図しない荷受台の動作切換えを防止し、安全性を高めることができる。 The single operation of the operation switch in the operation device and the switching of the plurality of operations of the operation switch and the changeover switch may be performed intentionally by the operator, but may not. That is, for example, when the operation switch is operated during the single operation of the changeover switch to switch from the single operation of the changeover switch to the multiple operation of the changeover switch and the operation switch, it is intended by the operator and is in a stopped state. There is no particular problem because the cradle is operated. On the other hand, if, for example, the changeover switch is operated for some reason during the single operation of the operation switch and the single operation of the operation switch is inadvertently changed to a plurality of operations of the operation switch and the changeover switch, the direction of the operator is not expected. The operation of the cradle was changed and it was very dangerous. Therefore, in the present invention, when the operation switch and the changeover switch are switched to a plurality of operations during the single operation of the operation switch, the operation changeover means invalidates the change of the operation contents of the load receiving table by the changeover switch. Maintain the operation of the cargo cradle by operation. As a result, it is possible to prevent the operation of the cargo cradle unintended by the operator from being switched and to improve safety.

（２）上記（１）において、好ましくは、前記操作装置及び前記受信機のうちいずれか一方は、前記作動スイッチの操作入力が継続しつつ前記切換スイッチの操作入力が中断された連続時間を計測し、この計測した前記切換スイッチの入力中断時間が所定時間を経過したときに、はじめて前記切換スイッチの操作入力が中断されたと判定する第１の入力中断判定手段を備える。 (2) In the above (1), preferably, any one of the operation device and the receiver measures a continuous time in which the operation input of the changeover switch is interrupted while the operation input of the operation switch is continued. And a first input interruption determining means for determining that the operation input of the changeover switch is interrupted for the first time when the measured input interruption time of the changeover switch has passed a predetermined time.

例えば作動スイッチと切換スイッチを操作していたときに、何らかの理由で切換スイッチを瞬間的に離してしまい、不用意に作動スイッチのみの単独操作にかわってしまう場合がある。このような場合にも、操作者の予想しない方向に荷受台が動作変更してしまい、大変危険であった。そこで本発明においては、第１の入力中断判定手段で、作動スイッチの操作入力が継続しつつ切換スイッチの操作入力が中断された連続時間を計測し、この計測した切換スイッチの入力中断時間が所定時間を経過したときに、はじめて切換スイッチの操作入力が中断されたと判定する。これにより、切換スイッチの入力中断時間が所定時間を経過するまでは、作動スイッチと切換スイッチの複数操作が維持され、切換スイッチの入力中断時間が所定時間を経過した後は、作動スイッチの単独操作とすることができる。したがって、操作者が意図しない荷受台の動作切換えを防止し、安全性を高めることができる。 For example, when the operation switch and the changeover switch are operated, the changeover switch may be momentarily released for some reason, and the single operation of only the operation switch may be inadvertently changed. Even in such a case, the operation of the receiving platform is changed in a direction unexpected by the operator, which is very dangerous. Therefore, in the present invention, the first input interruption determination means measures the continuous time that the operation input of the changeover switch is interrupted while the operation input of the operation switch is continued, and the measured input interruption time of the changeover switch is predetermined. When the time has elapsed, it is determined that the operation input of the changeover switch is interrupted for the first time. As a result, a plurality of operations of the operation switch and the changeover switch are maintained until the input interruption time of the changeover switch exceeds a predetermined time, and the operation switch is operated independently after the input interruption time of the changeover switch has exceeded the predetermined time. It can be. Therefore, it is possible to prevent switching of the operation of the receiving platform that is not intended by the operator, and to improve safety.

（３）上記（１）において、また好ましくは、前記操作装置及び前記受信機のうちいずれか一方は、前記切換スイッチの操作入力が中断された連続時間を計測し、この計測した前記切換スイッチの入力中断時間が所定時間を経過したときに、はじめて前記切換スイッチの操作入力が中断されたと判定する第２の入力中断判定手段を備える。 (3) In the above (1), preferably, any one of the operation device and the receiver measures a continuous time when the operation input of the changeover switch is interrupted, and the measured changeover switch Second input interruption determination means for determining that the operation input of the change-over switch is interrupted for the first time when the input interruption time has passed a predetermined time.

（４）上記（１）〜（３）のいずれか１つにおいて、好ましくは、前記操作装置は、前記切換スイッチ及び前記作動スイッチが操作入力されず所定時間経過したときに、電源ＯＦＦ状態に切換える電源切手段を備える。 (4) In any one of above (1) to (3), preferably, the operating device, when the selector switch and the operating switch has elapsed predetermined not operated input time, to the power OFF state Power-off means for switching is provided.

このように切換スイッチ及び作動スイッチが操作されず所定時間経過したときに、操作装置を電源ＯＦＦ状態とするので、不要なスイッチ操作による荷受台の駆動を防止し、安全性を高めることができる。 As described above, when the changeover switch and the operation switch are not operated and the predetermined time elapses, the operation device is turned off, so that it is possible to prevent the load receiving table from being driven by an unnecessary switch operation and to improve safety.

（５）上記（１）〜（４）のいずれか１つにおいて、好ましくは、前記操作装置は、前記切換スイッチの操作に応じて電源ＯＮ状態に切換える電源入手段を備える。
（６）上記（１）〜（５）のいずれか１つにおいて、好ましくは、平行リンクを介し前記荷受台の姿勢を維持したまま前記荷受台を昇降する昇降駆動部と、前記車両の車幅方向を軸芯として前記荷受台を略水平となる開放状態又は略鉛直となる閉塞状態まで回動する開閉駆動部とを備え、前記操作装置の切換スイッチは、前記作動スイッチとの複数操作により前記荷受台の昇降動作又は回動動作の切換えを指示可能である。 (5) In any one of above (1) to (4), preferably, the operating device, Ru includes a power on means for switching to the power ON state in response to the operation of the changeover switch.
(6) In any one of the above (1) to (5), preferably, an elevating drive unit that raises and lowers the load receiving base while maintaining the posture of the load receiving base via a parallel link, and a vehicle width of the vehicle An opening / closing drive unit that rotates the load receiving platform to an open state that is substantially horizontal or a closed state that is substantially vertical with the direction as an axis, and the changeover switch of the operating device is a plurality of operations with the operation switch. It is possible to instruct switching of the lifting / lowering operation or the rotation operation of the load receiving platform.

本発明によれば、操作装置における複数のスイッチの単独操作及び複数操作により、スイッチ数以上の荷受台の動作を指示することができる。また、操作装置は、これら複数のスイッチの操作に基づき荷受台を遠隔操作する無線信号を送信するので、例えばケーブルを介し操作指令信号を出力する場合に比べ、操作移動範囲を拡大し作業効率の向上を図ることができる。 According to the present invention, it is possible to instruct the operation of the load receiving platform more than the number of switches by single operation and multiple operations of a plurality of switches in the operation device. In addition, since the operating device transmits a radio signal for remotely operating the receiving platform based on the operation of the plurality of switches, for example, compared with the case where an operation command signal is output via a cable, the operation movement range is expanded and work efficiency is improved. Improvements can be made.

以下、本発明の一実施形態を、図面を参照しつつ説明する。 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

図１は、本発明の荷受台昇降装置の一実施形態が適用された車両の全体構造を表す側面図である。なお、以降、車両が図１に示す状態にて運転者が運転室に搭乗した場合における運転者の前側（図１中左側）、後側（図１中右側）、左側（図１中紙面に向かって手前側）、右側（図１中紙面に向かって奥側）を、単に前側、後側、左側、右側と称する。 FIG. 1 is a side view showing the overall structure of a vehicle to which an embodiment of a cargo receiving platform lifting apparatus of the present invention is applied. In the following, when the vehicle is in the cab in the state shown in FIG. 1, the driver's front side (left side in FIG. 1), rear side (right side in FIG. 1), left side (on the paper surface in FIG. 1). The front side and the right side (back side toward the paper surface in FIG. 1) are simply referred to as the front side, the rear side, the left side, and the right side.

図１において、この車両は、車体１の前方に設けられた運転室２と、車体１上に設けられた荷台３と、この荷台３の後側に設けられ荷受台４を昇降する荷受台昇降装置５とを備えている。荷受台昇降装置５は、車幅方向を軸芯として荷受台４を回動するようになっており、例えば走行運転時は荷受台４が略鉛直となる閉塞状態（図１中実線で示す状態）に配置され、また例えば荷物積込み・積卸し作業時は荷受台４が略水平となる開放状態（図１中二点鎖線で示す状態）に配置されて、荷受台４を荷台３の床部高さと地面高さとの間で昇降するようになっている。 In FIG. 1, this vehicle includes a cab 2 provided in front of a vehicle body 1, a loading platform 3 provided on the vehicle body 1, and a loading platform lifting / lowering a loading platform 4 provided on the rear side of the loading platform 3. And a device 5. The load receiving platform lifting / lowering device 5 is configured to rotate the load receiving stand 4 with the vehicle width direction as an axis. For example, during traveling operation, the load receiving stand 4 is in a closed state (state indicated by a solid line in FIG. 1). In addition, for example, when loading and unloading work, the load receiving platform 4 is disposed in an open state (indicated by a two-dot chain line in FIG. 1), and the load receiving platform 4 is placed on the floor portion of the loading platform 3. It goes up and down between the height and the ground level.

図２は、上記荷受台昇降装置５の詳細構造を表す斜視図であり、荷受台４が略水平となる開放状態である。 FIG. 2 is a perspective view showing the detailed structure of the load receiving table lifting device 5 in an open state where the load receiving table 4 is substantially horizontal.

この図２において、荷受台昇降装置５は、大別して、車体１の後部に固定された支持部６と、荷物を積載する上記荷受台（プラットフォーム）４と、この荷受台４を支持部６に対し昇降する昇降駆動部７と、荷受台４を上述の閉塞状態又は開放状態へ回動する開閉駆動部８とを備えている。 In FIG. 2, the load receiving platform lifting / lowering device 5 is roughly divided into a support portion 6 fixed to the rear portion of the vehicle body 1, the load receiving platform (platform) 4 for loading the load, and the load receiving stand 4 as the support portion 6. A lift drive unit 7 that moves up and down, and an open / close drive unit 8 that rotates the load receiving platform 4 to the closed state or the open state described above are provided.

支持部６は、車幅方向（図２中左下・右上方向）に延設された支持部材９と、この支持部材９の中央部後側（図２中右下側）に設けられたセンタバンパ１０と、支持部材６におけるセンタバンパ１０の外側（図２中左下・右上側）にそれぞれ設けられた左・右のブラケット部１１と、支持部材６におけるブラケット部１１の外側にそれぞれ設けた左・右のサイドバンパ１２とで構成されている。 The support 6 includes a support member 9 extending in the vehicle width direction (lower left and upper right in FIG. 2), and a center bumper 10 provided on the rear side of the center of the support member 9 (lower right in FIG. 2). Left and right bracket portions 11 provided on the outer side of the center bumper 10 in the support member 6 (lower left and upper right sides in FIG. 2), and left and right bracket portions provided on the outer side of the bracket portion 11 in the support member 6, respectively. It is comprised with the side bumper 12.

昇降駆動部７は、上端部がブラケット部１１に回動可能に連結された第１アーム（チルトアーム）１３と、前端部が第１アーム１３に回動可能に連結され後端部が後述のリンク部材と共に荷受台４に回動可能に連結された第２アーム（リフトアーム）１４と、前端部がブラケット部１１に回動可能に連結され後端部が上記リンク部材を介し荷受台４に回動可能に連結された第３アーム（コンプレッションアーム）１５と、ロッド側（図２中左上側）が第１アーム１３の下端部に軸着されボトム側（図２中右下側）が第２アーム１４に軸着されたリフトシリンダ１６とで構成され、これら第１アーム１３、第２アーム１４、第３アーム１５、及びリフトシリンダ１６はそれぞれ左右一対で設けられている。そして、第２アーム１４及び第３アーム１５が平行リンクを形成し、この平行リンクを介し荷受台４は姿勢を維持したまま、リフトシリンダ１６の伸縮駆動によって昇降するようになっている。 The elevating drive unit 7 includes a first arm (tilt arm) 13 whose upper end portion is rotatably connected to the bracket portion 11 and a front end portion rotatably connected to the first arm 13 and a rear end portion which will be described later. A second arm (lift arm) 14 rotatably connected to the load receiving table 4 together with the link member, and a front end portion rotatably connected to the bracket portion 11 and a rear end portion to the load receiving table 4 via the link member. A third arm (compression arm) 15 connected to be rotatable and a rod side (upper left side in FIG. 2) are pivotally attached to a lower end portion of the first arm 13, and a bottom side (lower right side in FIG. 2) is first. The lift cylinder 16 is pivotally attached to the two arms 14, and the first arm 13, the second arm 14, the third arm 15, and the lift cylinder 16 are provided in pairs. The second arm 14 and the third arm 15 form a parallel link, and the load receiving platform 4 is moved up and down by the expansion and contraction drive of the lift cylinder 16 while maintaining the posture through the parallel link.

開閉駆動部８は、荷受台４に内蔵されたチルトシリンダ１７を有し、このチルトシリンダ１７のロッド側が上記リンク部材に軸着され、ボトム側が荷受台４の下面に軸着されている。リンク部材は、詳細は図示しないが、第２アーム１４の後端部と荷受台４との間に枢軸された第１回動ピンに軸支されている。そして、チルトシリンダ１７の伸縮駆動によって、第１回動ピンを中心として荷受台４が回動するようになっている。なお、チルトシリンダ１７は、左右のいずれか一方（図２では左側）に設けるか、あるいは左右両方ともに設けてもよい。 The opening / closing drive unit 8 has a tilt cylinder 17 built in the load receiving platform 4, the rod side of the tilt cylinder 17 is pivotally mounted on the link member, and the bottom side is pivotally mounted on the lower surface of the load receiving platform 4. Although not shown in detail, the link member is pivotally supported by a first rotation pin pivoted between the rear end portion of the second arm 14 and the load receiving platform 4. Then, by the expansion and contraction drive of the tilt cylinder 17, the load receiving table 4 is rotated around the first rotation pin. The tilt cylinder 17 may be provided on either the left or right side (left side in FIG. 2), or both the left and right sides may be provided.

また、荷受台昇降装置５には、上記リフトシリンダ１６及び上記チルトシリンダ１７を駆動するための油圧駆動装置（パワーユニット）１８が設けられている。図３は、この油圧駆動装置１８の概略構成を一例として表す油圧回路図である。 In addition, the load receiving platform elevating device 5 is provided with a hydraulic drive device (power unit) 18 for driving the lift cylinder 16 and the tilt cylinder 17. FIG. 3 is a hydraulic circuit diagram illustrating the schematic configuration of the hydraulic drive device 18 as an example.

この図３において、油圧駆動装置１８は、電動モータ（原動機）１９と、この電動モータ１９によって駆動する油圧ポンプ２０と、この油圧ポンプ２０の吸込側に設けられたオイルタンク２１と、油圧ポンプ２０から吐出された圧油を上記リフトシリンダ１６（但し図３では代表して１つのみ図示）のボトム側に供給する圧油供給通路２２と、この圧油供給通路２２における逆止弁２３の下流側で分岐され、オイルタンク２１に連通された圧油戻し通路２４と、この圧油戻し通路２４の流れを連通・遮断状態に切換え可能なリフト用切換弁２５と、このリフト用切換弁２５の下流側に設けられた流量弁２６と、リフトシリンダ１６のロッド側とオイルタンク２１との間に接続された圧油戻し通路２７と、油圧ポンプ２０の吐出圧の最大値を規定するためのリリーフ弁２８と、電動モータ１９とバッテリ（図示せず）との間に接続されたコンダクタリレー２９とを備えている。 In FIG. 3, the hydraulic drive device 18 includes an electric motor (prime mover) 19, a hydraulic pump 20 driven by the electric motor 19, an oil tank 21 provided on the suction side of the hydraulic pump 20, and the hydraulic pump 20. Pressure oil supply passage 22 for supplying the pressure oil discharged from the lift cylinder 16 to the bottom side of the lift cylinder 16 (only one representative is shown in FIG. 3), and downstream of the check valve 23 in the pressure oil supply passage 22 A pressure oil return passage 24 that is branched on the side and communicated with the oil tank 21, a lift switching valve 25 that can switch the flow of the pressure oil return passage 24 to a communication / blocking state, and the lift switching valve 25. The flow rate valve 26 provided on the downstream side, the pressure oil return passage 27 connected between the rod side of the lift cylinder 16 and the oil tank 21, and the maximum value of the discharge pressure of the hydraulic pump 20 are regulated. A relief valve 28 for, and a conductor relay 29 connected between the electric motor 19 and a battery (not shown).

そして、例えばコンダクタリレー２９に駆動指令信号（電気信号）が入力されると、コイル２９ａが通電され、通常開き状態である接点２９ｂが閉じ状態となり、この接点２９ｂを介しバッテリから電気供給されて電動モータ１９が駆動し、この電動モータ１９によって油圧ポンプ２０が駆動する。これと同時に、リフト用切換弁２５のソレノイド部２５ａに駆動指令信号が入力されないと、リフト用切換弁２５が図３中下側の遮断位置に切換えられる。これにより、油圧ポンプ２０から吐出された圧油が圧油供給通路２２を介しリフトシリンダ１６に供給され、リフトシリンダ１６が伸長方向に駆動し、その結果、荷受台４が上昇するようになっている。一方、例えばコンダクタリレー２９に駆動指令信号が入力されないと、接点２９ｂが開き状態となって電動モータ１９及び油圧ポンプ２０が駆動停止し、これと同時に、リフト用切換弁２５のソレノイド部２５ａに駆動指令信号が入力されると、リフト用切換弁２５が図３中上側の連通位置に切換えられる。これにより、自重によってリフトシリンダ１６からの圧油が圧油戻し通路２４を介しオイルタンク２１に流出し、リフトシリンダ１６が縮短方向に駆動し、その結果、荷受台４が下降するようになっている。 For example, when a drive command signal (electrical signal) is input to the conductor relay 29, the coil 29a is energized, and the contact 29b that is normally open is closed, and is electrically supplied from the battery via the contact 29b and is electrically driven. The motor 19 is driven, and the hydraulic pump 20 is driven by the electric motor 19. At the same time, when the drive command signal is not input to the solenoid portion 25a of the lift switching valve 25, the lift switching valve 25 is switched to the lower cutoff position in FIG. As a result, the pressure oil discharged from the hydraulic pump 20 is supplied to the lift cylinder 16 via the pressure oil supply passage 22, and the lift cylinder 16 is driven in the extending direction, and as a result, the load receiving platform 4 is raised. Yes. On the other hand, for example, if a drive command signal is not input to the conductor relay 29, the contact 29b is opened and the electric motor 19 and the hydraulic pump 20 are stopped driving. At the same time, the drive is driven to the solenoid 25a of the lift switching valve 25. When the command signal is input, the lift switching valve 25 is switched to the upper communication position in FIG. As a result, the pressure oil from the lift cylinder 16 flows into the oil tank 21 through the pressure oil return passage 24 due to its own weight, and the lift cylinder 16 is driven in the contraction direction. As a result, the load receiving platform 4 is lowered. Yes.

また、油圧駆動装置１８は、圧供給供通路２２における逆止弁２３の上流側で分岐され、上記チルトシリンダ１７に圧油を供給するための圧油供給通路３０と、この圧油供給通路３０の流れを連通・遮断状態に切換え可能な第１チルト用切換弁３１と、この第１チルト用切換弁３１の上流側に設けた絞り弁３２と、圧油供給通路３０における第１チルト用切換弁３１の下流側で分岐され、圧油戻し通路２４における流量弁２６の下流側に接続された圧油戻し通路３３と、この圧油戻し通路３３の流れを連通・遮断状態に切換え可能な第２チルト用切換弁３４と、この第２チルト用切換弁３４の下流側に設けた絞り弁３５とを備えている。 The hydraulic drive device 18 is branched upstream of the check valve 23 in the pressure supply passage 22, and a pressure oil supply passage 30 for supplying pressure oil to the tilt cylinder 17, and the pressure oil supply passage 30. First tilt switching valve 31 capable of switching the flow of air to the communication / blocking state, a throttle valve 32 provided upstream of the first tilt switching valve 31, and a first tilt switching in the pressure oil supply passage 30. A pressure oil return passage 33 branched on the downstream side of the valve 31 and connected to the downstream side of the flow valve 26 in the pressure oil return passage 24, and a flow in the pressure oil return passage 33 that can be switched to a communication / blocking state. A 2-tilt switching valve 34 and a throttle valve 35 provided on the downstream side of the second tilt switching valve 34 are provided.

そして、例えばコンダクタリレー２９に駆動指令信号が入力されると、上述したように電動モータ１９及び油圧ポンプ２０が駆動し、これと同時に、第１チルト用切換弁３１のソレノイド部３１ａに駆動指令信号が入力されると、第１チルト用切換弁３１が図３中上側の連通位置に切換えられる。このとき、第２チルト用切換弁３４が図３中下側の遮断位置であるから、油圧ポンプ２０から吐出された圧油が圧油供給通路３０を介しチルトシリンダ１７に供給され、チルトシリンダ１７が伸長方向に駆動し、その結果、荷受台４が閉塞状態へ回動する（閉じる）ようになっている。一方、例えばコンダクタリレー２９に駆動指令信号が入力されないと、上述したように電動モータ１９及び油圧ポンプ２０が駆動停止し、これと同時に、第２チルト用切換弁３４のソレノイド部３４ａに駆動指令信号が入力されると、第２チルト用切換弁３４が図３中上側の連通位置に切換えられる。このとき、第１チルト用切換弁３１が図３中下側の遮断位置であるから、自重によってチルトシリンダ１７からの圧油が圧油戻し通路３３を介しオイルタンク２１に流出し、チルトシリンダ１７が縮短方向に駆動し、その結果、荷受台４が開放状態へ回動する（開く）ようになっている。 For example, when the drive command signal is input to the conductor relay 29, the electric motor 19 and the hydraulic pump 20 are driven as described above, and at the same time, the drive command signal is sent to the solenoid portion 31a of the first tilt switching valve 31. Is input, the first tilt switching valve 31 is switched to the upper communication position in FIG. At this time, since the second tilt switching valve 34 is in the lower cutoff position in FIG. 3, the pressure oil discharged from the hydraulic pump 20 is supplied to the tilt cylinder 17 via the pressure oil supply passage 30, and the tilt cylinder 17. Is driven in the extending direction, and as a result, the load receiving platform 4 is rotated (closed) to the closed state. On the other hand, for example, when a drive command signal is not input to the conductor relay 29, the electric motor 19 and the hydraulic pump 20 stop driving as described above, and at the same time, the drive command signal is sent to the solenoid portion 34a of the second tilt switching valve 34. Is input, the second tilt switching valve 34 is switched to the upper communication position in FIG. At this time, since the first tilt switching valve 31 is in the lower cutoff position in FIG. 3, the pressure oil from the tilt cylinder 17 flows into the oil tank 21 through the pressure oil return passage 33 by its own weight, and the tilt cylinder 17 Is driven in the contraction direction, and as a result, the load receiving platform 4 is rotated (opened) to the open state.

図４は、上記荷受台昇降装置５の駆動制御に係わる要部構成を表す電気回路図であり、図５は、後述の操作装置の外観を表す概略図である。 FIG. 4 is an electric circuit diagram showing the configuration of the main part related to the drive control of the load receiving platform lifting / lowering device 5, and FIG. 5 is a schematic diagram showing the appearance of the operation device described later.

これら図４及び図５において、上記荷受台昇降装置５を遠隔操作する無線信号を送信する操作装置３６と、車両側に設けられ、操作装置３６からの無線信号を受信し操作指令信号（電気信号）を出力する受信機３７と、この受信機３７からの操作指令信号に応じて上記コンダクタリレー２９、上記リフト用切換弁２５のソレノイド部２５ａ、上記第１チルト用切換弁３１のソレノイド部３１ａ、及び上記第２チルト用切換弁３４のソレノイド部３４ａにそれぞれ駆動指令信号を出力する制御回路装置３８とが設けられている。 4 and 5, an operating device 36 for transmitting a radio signal for remotely operating the load receiving platform lifting device 5 and a radio signal from the operating device 36 provided on the vehicle side and receiving an operation command signal (electrical signal). ), And in response to an operation command signal from the receiver 37, the conductor relay 29, the solenoid part 25a of the lift switching valve 25, the solenoid part 31a of the first tilt switching valve 31, And a control circuit device 38 for outputting a drive command signal to the solenoid part 34a of the second tilt switching valve 34, respectively.

操作装置３６は、荷受台４の動作一方向及び動作他方向をそれぞれ指示可能な例えば押しボタン式の上・下側の作動スイッチ３９Ａ，３９Ｂと、作動スイッチ３９Ａ又は３９Ｂとの複数操作により荷受台４の動作内容の切換えを指示可能な例えば押しボタン式の切換スイッチ（開閉スイッチ）４０と、これら作動スイッチ３９Ａ又は３９Ｂと切換スイッチ４０のＯＮ・ＯＦＦ状態等のシリアルデータを生成し、このシリアルデータを無線信号として送信する送信機４１とを備えており、例えば操作者が携帯可能な構成としている。そして、作動スイッチ３９Ａ又は３９Ｂの単独操作が行われると、荷受台４の昇降動作を指示し、作動スイッチ３９Ａ又は３９Ｂと切換スイッチ４０との複数操作が行われると、荷受台４の閉塞状態又は開放状態への回動動作（開閉動作）を指示するようになっている。 The operation device 36 is capable of indicating one operation direction and the other operation direction of the load receiving platform 4 by, for example, a push button type upper / lower operation switches 39A, 39B and a plurality of operations of the operation switches 39A or 39B. 4 for example, a push button type changeover switch (open / close switch) 40 capable of instructing switching of the operation content, and serial data such as ON / OFF states of the operation switch 39A or 39B and the changeover switch 40 are generated. Is transmitted as a radio signal, and is configured to be portable for example by an operator. Then, when the operation switch 39A or 39B is operated alone, the lifting operation of the load receiving platform 4 is instructed, and when the operation switch 39A or 39B and the changeover switch 40 are operated multiple times, the load receiving table 4 is closed or A rotation operation (open / close operation) to an open state is instructed.

また、操作装置３６は、作動スイッチ３９Ａ，３９Ｂ及び切換スイッチ４０が操作入力されない状態を検出し、その経過時間が所定時間Ｔ_１（但し、Ｔ_１（＝例えば３０秒程度）＞後述の所定時間Ｔ_２）を経過したときに、電源ＯＦＦ状態に切換えるようになっている（電源切手段）。また、切換スイッチ４０は、操作装置３６を電源ＯＮ状態に切換え可能な電源スイッチ機能を有し、切換スイッチ４０の単独操作が行われると、操作装置３６を電源ＯＮ状態に切換えるようになっている。 The operation device 36 detects a state in which the operation switches 39A and 39B and the changeover switch 40 are not operated, and the elapsed time is a predetermined time T ₁ (where T ₁ (= about 30 seconds, for example)> a predetermined time described later. When T ₂ ) elapses, the power is turned off (power-off means). Further, the changeover switch 40 has a power switch function capable of switching the operating device 36 to the power ON state. When the changeover switch 40 is operated alone, the operating device 36 is switched to the power ON state. .

受信機３７は、例えば運転室２や荷受台昇降装置５近傍などに設けたメインスイッチ（図示せず）の操作により、その電源がＯＮ・ＯＦＦ状態に切換えられるようになっている。そして、受信機３７は、操作装置３６からの無線信号に対し所定の演算処理を行い、生成した操作指令信号（詳細には、切換スイッチ４０のＯＮ状態に対応する開閉信号、上側作動スイッチ３９ＡのＯＮ状態に対応する上側作動信号、及び下側作動スイッチ３９ＢのＯＮ状態に対応する下側作動信号）を出力するようになっている。そして、受信機３７は、切換スイッチ４０が単独でＯＮ状態である場合に対応する開閉信号を出力し、その開閉信号の出力を継続した状態で作動スイッチ３９Ａ又は３９ＢがＯＮ状態に切換えられたときは、対応する上側作動信号又は下側作動信号を出力するようになっている。また、作動スイッチ３９Ａ又は３９Ｂが単独でＯＮ状態である場合に対応する上側作動信号又は下側作動信号を出力し、その上側作動信号又は下側作動信号の出力を継続した状態で切換スイッチ４０がＯＮ状態に切換えられたときは、対応する開閉信号を出力しないようになっている（動作切換無効手段）。 The receiver 37 is configured to be turned on and off by operating a main switch (not shown) provided in the vicinity of the cab 2 or the loading platform elevating device 5, for example. Then, the receiver 37 performs predetermined arithmetic processing on the radio signal from the operation device 36 and generates the generated operation command signal (specifically, the open / close signal corresponding to the ON state of the changeover switch 40, the upper operation switch 39A). The upper operation signal corresponding to the ON state and the lower operation signal corresponding to the ON state of the lower operation switch 39B) are output. Then, the receiver 37 outputs an opening / closing signal corresponding to the case where the changeover switch 40 is in the ON state alone, and the operation switch 39A or 39B is switched to the ON state in a state where the output of the opening / closing signal is continued. Are adapted to output a corresponding upper or lower actuation signal. In addition, when the operation switch 39A or 39B is in an ON state alone, the upper operation signal or the lower operation signal is output, and the output of the upper operation signal or the lower operation signal is continued. When switched to the ON state, the corresponding open / close signal is not output (operation switching invalid means).

また、受信機３７は、切換スイッチ４０のＯＮ状態に対応する開閉信号と、作動スイッチ３９ＡのＯＮ状態に対応する上側作動信号又は作動スイッチ３９ＢのＯＮ状態に対応する下側作動信号とを出力をしている状態で、切換スイッチ４０がＯＦＦ状態に切換えられたとき、その切換スイッチ４０の操作入力中断が有効であるかどうかを判定するようになっている。このような受信機３７の制御手順を図６により説明する。 The receiver 37 outputs an open / close signal corresponding to the ON state of the changeover switch 40 and an upper operation signal corresponding to the ON state of the operation switch 39A or a lower operation signal corresponding to the ON state of the operation switch 39B. When the changeover switch 40 is switched to the OFF state in a state in which it is in operation, it is determined whether or not the operation input interruption of the changeover switch 40 is valid. The control procedure of the receiver 37 will be described with reference to FIG.

図６は、受信機３７の上記制御処理内容を表すフローチャートである。 FIG. 6 is a flowchart showing the contents of the control process of the receiver 37.

この図６において、まずステップ１００において、受信機３７は、操作装置３６からの無線信号に対し所定の演算処理を行い、切換スイッチ４０がＯＮ状態である場合、これに対応する開閉信号を制御回路装置３８に出力する。そして、ステップ１１０に進み、操作装置３６からの無線信号により作動スイッチ３９Ａ又は３９ＢがＯＮ状態であるかどうかを判定する。例えば作動スイッチ３９Ａ又は３９ＢがＯＮ状態である場合は、ステップ１１０の判定が満たされ、ステップ１２０に進んで、上側作動スイッチ３９ＡのＯＮ状態に対応する上側作動信号、又は下作動スイッチ３９ＢのＯＮ状態に対応する下側作動信号を制御回路装置３８に出力する。そして、ステップ１３０に進み、操作装置３６からの無線信号により、切換スイッチ４０の操作入力が中断されたか（言い換えれば、ＯＮ状態からＯＦＦ状態に切換えられたか）どうかを判定する。 In FIG. 6, first, in step 100, the receiver 37 performs a predetermined arithmetic process on the radio signal from the operation device 36, and when the changeover switch 40 is in the ON state, an opening / closing signal corresponding thereto is sent to the control circuit. Output to the device 38. Then, the process proceeds to step 110, and it is determined whether or not the operation switch 39A or 39B is in an ON state based on a radio signal from the operation device 36. For example, when the operation switch 39A or 39B is in the ON state, the determination in step 110 is satisfied, and the process proceeds to step 120, where the upper operation signal corresponding to the ON state of the upper operation switch 39A or the ON state of the lower operation switch 39B Is output to the control circuit device 38. Then, the process proceeds to step 130, where it is determined whether or not the operation input of the changeover switch 40 has been interrupted (in other words, has been switched from the ON state to the OFF state) by the wireless signal from the operation device 36.

例えば切換スイッチ４０がＯＮ状態からＯＦＦ状態に切換えられた場合、ステップ１３０の判定が満たされ、ステップ１４０に移る。ステップ１４０では、切換スイッチ４０のＯＦＦ状態の連続時間（入力中断時間）ｔを計測する。そして、ステップ１５０に進み、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２（例えば０．５秒）以上であるかどうかを判定する。例えば切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２未満である場合は、ステップ１５０の判定が満たされず、上記ステップ１１０に戻る。そして、上述のステップ１１０〜１５０が繰り返され、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２以上となったときに、ステップ１５０の判定が満たされ、ステップ１６０に移る。ステップ１６０では、開閉信号を出力停止し、ステップ１７０に進んで、ｔ＝０に初期化する。 For example, when the changeover switch 40 is switched from the ON state to the OFF state, the determination at Step 130 is satisfied, and the routine goes to Step 140. In step 140, the continuous time (input interruption time) t in the OFF state of the changeover switch 40 is measured. In step 150, it is determined whether the input interruption time t of the changeover switch 40 is equal to or longer than a predetermined time T ₂ (for example, 0.5 seconds). For example, when the input interruption time t of the change-over switch 40 is ₂ less than the predetermined time T, the determination is not satisfied in step 150, returns to step 110. The above steps 110 to 150 are repeated, when the input interruption time t of the change-over switch 40 becomes a predetermined time _{T 2} or more, the determination is satisfied in step 150, proceeds to step 160. In step 160, the output of the open / close signal is stopped, the process proceeds to step 170, and is initialized to t = 0.

また、ステップ１３０で切換スイッチ４０がＯＮ状態である場合（言い換えれば、切換スイッチ４０がＯＦＦ状態に切換えられない場合、あるいは切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２未満である間に、切換スイッチ４０がＯＦＦ状態からＯＮ状態に切換えられた場合）は、その判定が満たされ、上記ステップ１７０に進んで、ｔ＝０に初期化する。 Further, when the changeover switch 40 is in the ON state in Step 130 (in other words, when the changeover switch 40 is not switched to the OFF state, or while the input interruption time t of the changeover switch 40 is less than the predetermined time T ₂ , If the changeover switch 40 is switched from the OFF state to the ON state), the determination is satisfied, and the routine proceeds to step 170, where t = 0 is initialized.

また、ステップ１１０で作動スイッチ３９Ａ，３９ＢがＯＦＦ状態である場合は（例えば切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２未満である間に、作動スイッチ３９Ａ，３９ＢがＯＮ状態からＯＦＦ状態に切換えられた場合も含め）、その判定が満たされず、ステップ１８０に移る。ステップ１８０では、上側作動信号及び下側作動信号を出力停止する。そして、ステップ１９０に進み、切換スイッチ４０の操作入力が中断されたか（言い換えれば、ＯＮ状態からＯＦＦ状態に切換えられたか）どうかを判定する。 Moreover, the activation switch 39A at step 110, while 39B is the case in the OFF state is (for example, less than the input interruption time t is the predetermined time _{T 2} of the change-over switch 40, operating switches 39A, 39B is in the OFF state from the ON state The determination is not satisfied and the process proceeds to step 180. In step 180, the output of the upper operation signal and the lower operation signal is stopped. Then, the process proceeds to step 190 to determine whether or not the operation input of the changeover switch 40 has been interrupted (in other words, has been switched from the ON state to the OFF state).

例えば切換スイッチ４０がＯＮ状態からＯＦＦ状態に切換えられた場合は、ステップ１９０の判定が満たされ、上記ステップ１６０に進んで、開閉信号を出力停止し、上記ステッ１７０に進んで、ｔ＝０に初期化する。一方、例えば切換スイッチ４０がＯＮ状態である場合は、ステップ１９０の判定が満たされず、上記ステップ１７０に進んで、ｔ＝０に初期化する。 For example, when the changeover switch 40 is switched from the ON state to the OFF state, the determination in Step 190 is satisfied, the process proceeds to Step 160, the output of the open / close signal is stopped, the process proceeds to Step 170, and t = 0. initialize. On the other hand, for example, when the changeover switch 40 is in the ON state, the determination in step 190 is not satisfied, and the routine proceeds to step 170 and is initialized to t = 0.

前述の図４に戻り、制御回路装置３８は、上述した受信機３７からの開閉信号、上側作動信号、及び下側作動信号がそれぞれ入力される開閉信号制御回路４２、上側作動信号制御回路４３、及び下側作動信号制御回路４４で構成されている。開閉信号制御回路４２には、開閉リレーコイル４５ａが接続されている。上側作動信号制御回路４３には、上記コンダクタリレー２９のコイル２９ａと、開閉リレー接点４５ｂを介した上記第１チルト用切換弁３１のソレノイド部３１ａとが並列に接続されている。下側作動信号制御回路４４には、開閉リレー接点４５ｃを介した上記リフト用切換弁２５のソレノイド部２５ａと、開閉リレー接点４５ｄを介した上記第２チルト用切換弁３４のソレノイド部３４ａとが並列に接続されている。なお、下側作動信号制御回路４４の開閉リレー接点４５ｃ，４５ｄは、互いに連動するようになっている。 Returning to FIG. 4 described above, the control circuit device 38 includes an open / close signal control circuit 42, an upper operation signal control circuit 43, to which the above-described open / close signal, upper operation signal, and lower operation signal from the receiver 37 are input. And a lower operation signal control circuit 44. An open / close relay coil 45 a is connected to the open / close signal control circuit 42. The upper operation signal control circuit 43 is connected in parallel with the coil 29a of the conductor relay 29 and the solenoid portion 31a of the first tilt switching valve 31 via the open / close relay contact 45b. The lower operation signal control circuit 44 includes a solenoid portion 25a of the lift switching valve 25 via the switching relay contact 45c and a solenoid portion 34a of the second tilt switching valve 34 via the switching relay contact 45d. Connected in parallel. The open / close relay contacts 45c and 45d of the lower operation signal control circuit 44 are interlocked with each other.

そして、例えば受信機３７からの開閉信号がＯＦＦ、上側作動信号がＯＮの場合、通常、開閉リレー接点４５ｂは開き状態であるから、上側作動信号制御回路４３を介しコンダクタリレー２９のコイル２９ａが通電されて接点２９ｂ（前述の図３参照）が閉じ状態となり、これによって上述したようにリフトシリンダ１６が伸長方向に駆動し、荷受台４が上昇するようになっている。また、例えば受信機３７からの開閉信号がＯＦＦ、下側作動信号がＯＮの場合、通常、開閉リレー接点４５ｃは閉じ状態、開閉リレー接点４５ｄは開き状態であるから、下側作動信号制御回路４４を介しリフト用切換弁２５のソレノイド部２５ａに駆動指令信号が出力され、これによって上述したようにリフトシリンダ１６が縮短方向に駆動し、荷受台４が下降するようになっている。 For example, when the open / close signal from the receiver 37 is OFF and the upper operation signal is ON, the open / close relay contact 45b is normally open, so that the coil 29a of the conductor relay 29 is energized via the upper operation signal control circuit 43. As a result, the contact point 29b (see FIG. 3 described above) is in a closed state, whereby the lift cylinder 16 is driven in the extending direction as described above, and the load receiving platform 4 is raised. For example, when the open / close signal from the receiver 37 is OFF and the lower operation signal is ON, the open / close relay contact 45c is normally closed and the open / close relay contact 45d is open. A drive command signal is output to the solenoid portion 25a of the lift switching valve 25 through this, whereby the lift cylinder 16 is driven in the contraction direction as described above, and the load receiving platform 4 is lowered.

また、例えば受信機３７からの開閉信号がＯＮ、上側作動信号がＯＮの場合、開閉信号制御回路４２の開閉リレーコイル４５ａが通電されて、開閉リレー接点４５ｂが閉じ状態となり、上側作動信号制御回路４３を介しコンダクタリレー２９のコイル２９ｂ及び第１チルト用切換弁３１のソレノイド部３１ａに駆動指令信号が出力され、これによって上述したようにチルトシリンダ１７が伸長方向に駆動し、荷受台４が閉塞状態へ回動する（閉じる）ようになっている。また、例えば受信機３７からの開閉信号がＯＮ、下側作動信号がＯＮの場合、開閉信号制御回路４２の開閉リレーコイル４５ａが通電されて、開閉リレー接点４５ｃが開き状態、開閉リレー接点４５ｄが閉じ状態となり、下側作動信号制御回路４４を介し第２チルト用切換弁３４のソレノイド部３４ａに駆動指令信号が出力され、これによって上述したようにチルトシリンダ１７が縮短方向に駆動し、荷受台４が開放状態へ回動する（開く）ようになっている。 Further, for example, when the open / close signal from the receiver 37 is ON and the upper operation signal is ON, the open / close relay coil 45a of the open / close signal control circuit 42 is energized, the open / close relay contact 45b is closed, and the upper operation signal control circuit A drive command signal is output to the coil 29b of the conductor relay 29 and the solenoid part 31a of the first tilt switching valve 31 via 43, whereby the tilt cylinder 17 is driven in the extending direction as described above, and the load receiving table 4 is closed. It rotates (closes) to the state. For example, when the open / close signal from the receiver 37 is ON and the lower operation signal is ON, the open / close relay coil 45a of the open / close signal control circuit 42 is energized, the open / close relay contact 45c is open, and the open / close relay contact 45d is In the closed state, a drive command signal is output to the solenoid portion 34a of the second tilt switching valve 34 via the lower operation signal control circuit 44. As a result, the tilt cylinder 17 is driven in the contraction direction as described above, and the load receiving table. 4 rotates (opens) to an open state.

なお、上記において、受信機３７が行う図６のステップ１１０〜１６０は、特許請求の範囲記載の作動スイッチの操作入力が継続しつつ切換スイッチの操作入力が中断された連続時間を計測し、この計測した切換スイッチの入力中断時間が所定時間を経過したときに、はじめて切換スイッチの操作入力が中断されたと判定する第１の入力中断判定手段を構成する。 In the above, steps 110 to 160 of FIG. 6 performed by the receiver 37 measure the continuous time when the operation input of the operation switch described in the claims continues and the operation input of the changeover switch is interrupted. First input interruption determination means for determining that the operation input of the changeover switch has been interrupted for the first time when the measured input interruption time of the changeover switch has passed a predetermined time.

次に、本実施形態における動作を説明する。図７は、荷受台昇降装置５の動作を説明するためのタイムチャートである。 Next, the operation in this embodiment will be described. FIG. 7 is a time chart for explaining the operation of the cargo receiver lifting device 5.

この図７において、まず、操作者が操作装置３６の切換スイッチ４０を操作すると、操作装置３６が電源ＯＮ状態となる。そして、再び操作装置３６の切換スイッチ４０を操作入力し、それを継続しつつ上側作動スイッチ３９Ａ（又は下側作動スイッチ３９Ｂ、以降かっこ内対応同じ）を操作すると、これに基づいた無線信号が送信機４１から受信機３７に送信される。受信機３７は、操作装置３６からの無線信号に対し所定の演算処理を行い、切換スイッチ４０のＯＮ状態に対応する開閉信号及び上側作動スイッチ３９ＡのＯＮ状態に対応する上側作動信号（又は下側作動スイッチ３９Ｂに対応する下側作動信号）を制御回路装置３８に出力する。そして、制御回路装置３８を介し、コンダクタリレー２９及び第１チルト用切換弁３１のソレノイド部３１ａ（又は第２チルト用切換弁３４のソレノイド部３４ａのみ）に駆動指令信号が入力され、これによってチルトシリンダ１７が伸長方向（又は縮短方向）に駆動し、荷受台４が閉じる（又は開く）。 In FIG. 7, first, when the operator operates the changeover switch 40 of the operation device 36, the operation device 36 is turned on. Then, when the operation switch 36 of the operation device 36 is operated again and the upper operation switch 39A (or the lower operation switch 39B, the same in parenthesis is the same) is operated while continuing the operation, a radio signal based on this is transmitted. Is transmitted from the machine 41 to the receiver 37. The receiver 37 performs predetermined arithmetic processing on the radio signal from the operation device 36, and an open / close signal corresponding to the ON state of the changeover switch 40 and an upper operation signal (or lower side) corresponding to the ON state of the upper operation switch 39A. The lower operation signal corresponding to the operation switch 39B is output to the control circuit device 38. Then, a drive command signal is input to the conductor relay 29 and the solenoid portion 31a of the first tilt switching valve 31 (or only the solenoid portion 34a of the second tilt switching valve 34) via the control circuit device 38, thereby tilting. The cylinder 17 is driven in the extending direction (or contracting direction), and the load receiving platform 4 is closed (or opened).

そして、操作者が上側作動スイッチ３９Ａ（又は下側作動スイッチ３９Ｂ）の操作入力を継続しつつ切換スイッチ４０の操作入力を中断すると、前述の図６のステップ１１０〜１３０を経てステップ１４０において、受信機３７は切換スイッチ４０の入力中断時間ｔを計測する。このとき、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２＝０．５秒を経過する前に、操作者が切換スイッチ４０を再び操作入力すると、ステップ１５０の判定が満たされず、受信機３７は開閉信号の出力を中断することなく継続し、荷受台４の開閉動作が維持される。 When the operator interrupts the operation input of the changeover switch 40 while continuing the operation input of the upper operation switch 39A (or the lower operation switch 39B), the reception is received in step 140 through steps 110 to 130 of FIG. The machine 37 measures the input interruption time t of the changeover switch 40. At this time, if the operator inputs the changeover switch 40 again before the input interruption time t of the changeover switch 40 exceeds the predetermined time T ₂ = 0.5 seconds, the determination in step 150 is not satisfied, and the receiver 37 Continues without interrupting the output of the opening / closing signal, and the opening / closing operation of the load receiving platform 4 is maintained.

一方、上側作動スイッチ３９Ａ（又は下側作動スイッチ３９Ｂ）の操作入力を継続しつつ、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２＝０．５秒以上となる場合には、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２＝０．５秒を経過した時点で、ステップ１５０の判定が満たされステップ１６０で、受信機３７は、開閉信号を出力停止し、上側作動スイッチ３９ＡのＯＮ状態に対応する上側作動信号（又は下側作動スイッチ３９Ｂに対応する下側作動信号）のみを制御回路装置３８に出力する。そして、制御回路装置３８を介し、コンダクタリレー２９（又はリフト用切換弁２５のソレノイド部２５ａ）に駆動指令信号が入力され、これによってリフトシリンダ１６が伸長方向（又は縮短方向）に駆動し、荷受台４が上昇（又は下降）する。 On the other hand, when the input interruption time t of the changeover switch 40 is equal to or longer than the predetermined time T ₂ = 0.5 seconds while continuing the operation input of the upper operation switch 39A (or the lower operation switch 39B), the changeover switch 40 is used. When the predetermined time T ₂ = 0.5 seconds elapses, the determination in step 150 is satisfied, and in step 160, the receiver 37 stops outputting the open / close signal, and the upper operation switch 39A is turned on. Only the upper operation signal corresponding to the state (or the lower operation signal corresponding to the lower operation switch 39B) is output to the control circuit device 38. Then, a drive command signal is input to the conductor relay 29 (or the solenoid portion 25a of the lift switching valve 25) via the control circuit device 38, whereby the lift cylinder 16 is driven in the extending direction (or contracting direction) to receive the cargo. The table 4 is raised (or lowered).

その後、操作者が作動スイッチ３９Ａ（又は３９Ｂ）の単独操作を中断すると、受信機３７からの上側作動信号（又は下側作動信号）が出力停止され、荷受台４は停止する。また、操作者が切換スイッチ４０を単独操作すると、ステップ１００で受信機３７から開閉信号が出力され、その後、切換スイッチ４０の単独操作を中断すると、ステップ１１０及び１８０を経てステップ１９０の判定が満たされ、ステップ１６０で受信機３７は開閉信号を出力停止する。そして、作動スイッチ３９Ａ，３９Ｂ及び切換スイッチ４０を操作入力しないで所定時間Ｔ_１（＝３０秒）を経過すると、操作装置３６が電源ＯＦＦ状態となる。 Thereafter, when the operator interrupts the single operation of the operation switch 39A (or 39B), the output of the upper operation signal (or the lower operation signal) from the receiver 37 is stopped, and the cargo receiving platform 4 is stopped. When the operator operates the changeover switch 40 alone, an open / close signal is output from the receiver 37 at step 100. After that, when the operation of the changeover switch 40 is interrupted, the determination at step 190 is satisfied via steps 110 and 180. In step 160, the receiver 37 stops outputting the open / close signal. Then, when a predetermined time T ₁ (= 30 seconds) has elapsed without operating the operation switches 39A and 39B and the changeover switch 40, the operation device 36 is turned off.

以上のように本実施形態においては、操作装置３６は作動スイッチ３９Ａ，３９Ｂ及び切換スイッチ４０を有し、作動スイッチ３９Ａ又は３９Ｂの単独操作による荷受台４の上昇・下降動作と、作動スイッチ３９Ａ又は３９Ｂと切換スイッチ４０の複数操作による荷受台４の閉じ・開き動作とを合わせた計４つの荷受台４の動作を指示することができる。そして、操作装置３６は、これら作動スイッチ３９Ａ又は３９Ｂと切換スイッチ４０の操作に基づいた無線信号を送信する。これにより、例えばケーブルを介し操作指令信号を出力する場合に比べ、操作装置３６を比較的自由に移動させることが可能となり、操作移動範囲を拡大することができる。また、ケーブルの引廻し・収納といった作業前後の手間をなくすことができ、作業効率の向上を図ることができる。 As described above, in the present embodiment, the operating device 36 has the operation switches 39A and 39B and the changeover switch 40, and the lifting / lowering operation of the load receiving platform 4 by the independent operation of the operation switch 39A or 39B, and the operation switch 39A or It is possible to instruct the operation of a total of four load receiving bases 4 including the closing and opening operations of the load receiving bases 4 by a plurality of operations of 39B and the changeover switch 40. The operation device 36 transmits a radio signal based on the operation of the operation switch 39A or 39B and the changeover switch 40. Thereby, compared with the case where an operation command signal is output via a cable, for example, the operation device 36 can be moved relatively freely, and the operation movement range can be expanded. In addition, it is possible to eliminate the troubles before and after the work of routing and storing the cable, and the work efficiency can be improved.

また、上述の図７で説明したように、切換スイッチ４０の単独操作中に作動スイッチ３９Ａ（又は３９Ｂ）を操作して、切換スイッチ４０と作動スイッチ３９Ａ（又は３９Ｂ）の複数操作に切換えた場合は、受信機３７が対応する開閉信号と上側作動信号（又は下側作動信号）を出力するので、停止していた荷受台４が閉じる（又は開く）。一方、作動スイッチ３９Ａ（又は３９Ｂ）の単独操作中に切換スイッチ４０を操作して、作動スイッチ３９Ａ（又は３９Ｂ）と切換スイッチ４０の複数操作に切換えた場合は、受信機３７が上側作動信号（又は下側作動信号）の出力を継続し、開閉信号を出力しないので、荷受台４の上昇動作（下降動作）を維持する。これにより、荷受台４の昇降動作から開閉動作への急な切換えを防止し、安全性を高めることができる。 Further, as described with reference to FIG. 7 above, when the operation switch 39A (or 39B) is operated during the single operation of the changeover switch 40 and the operation is switched to a plurality of operations of the changeover switch 40 and the operation switch 39A (or 39B). Since the receiver 37 outputs a corresponding open / close signal and an upper operation signal (or a lower operation signal), the stopped cradle 4 is closed (or opened). On the other hand, when the changeover switch 40 is operated during the single operation of the operation switch 39A (or 39B) and the operation switch 39A (or 39B) and the changeover switch 40 are switched to a plurality of operations, the receiver 37 receives the upper operation signal ( Alternatively, the output of the lower operation signal) is continued and the open / close signal is not output, so that the ascending operation (lowering operation) of the load receiving platform 4 is maintained. Thereby, sudden switching from the raising / lowering operation | movement of the load receiving stand 4 to an opening / closing operation | movement can be prevented, and safety | security can be improved.

また、受信機３７は、作動スイッチ３９Ａ又は３９Ｂの操作入力が継続しつつ切換スイッチ４０の操作入力が中断された連続時間ｔを計測し、この計測した切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２を経過したときに、はじめて切換スイッチ４０の操作入力が中断されたと判定する。これにより、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２を経過するまでは、作動スイッチ３９Ａ又は３９Ｂと切換スイッチ４０との複数操作が維持され、切換スイッチ４０の入力中断時間ｔが所定時間Ｔ_２を経過した後は、作動スイッチ３９Ａ又は３９Ｂの単独操作とすることができる。したがって、操作者が意図しない荷受台４の開閉動作から昇降動作への切換えを防止し、安全性を高めることができる。 The receiver 37 measures the continuous time t when the operation input of the changeover switch 40 is interrupted while the operation input of the operation switch 39A or 39B is continued, and the measured input interruption time t of the changeover switch 40 is the predetermined time. when a lapse of T _2, first determines an operation input of the changeover switch 40 is interrupted. Thus, until the input interruption time t of the change-over switch 40 has passed a predetermined time T _2, operating plural operating the switch 39A or 39B and the change-over switch 40 is maintained, the input interrupt time t is the predetermined time of the change-over switch 40 after a lapse of T ₂ are, it can be a single operation of the operation switch 39A or 39B. Therefore, it is possible to prevent switching from the opening / closing operation of the cargo receiving table 4 to the lifting / lowering operation, which is not intended by the operator, and to improve safety.

また、切換スイッチ４０及び作動スイッチ３９Ａ，３９Ｂが操作されず所定時間Ｔ_１経過したときに、操作装置３６を電源ＯＦＦ状態とするので、不要なスイッチ操作による荷受台４の駆動を防止し、安全性を高めることができる。また、必要な場合には、切換スイッチ４０で操作装置３６を電源ＯＮ状態に切換えることができる。 Further, the changeover switch 40 and operating switch 39A, when the 39B has been not the predetermined time T ₁ elapses operation, since the operating device 36 and the power OFF state, preventing the driving of the receiving platform 4 due to unnecessary switching operations, safety Can increase the sex. If necessary, the operation device 36 can be switched to the power ON state by the changeover switch 40.

なお、上記一実施形態においては、切換スイッチ４０の操作入力の中断が有効であるかどうかを判定する第１の入力中断判定手段を、受信機３７に設けた場合を例にとって説明したが、これに限られず、例えば操作装置３６の送信機４１等に設けてもよい。この場合も、上記同様の効果を得ることができる。 In the above-described embodiment, the case where the first input interruption determination unit for determining whether the interruption of the operation input of the changeover switch 40 is effective has been described as an example. For example, the transmitter 41 of the operation device 36 may be provided. In this case, the same effect as described above can be obtained.

また、上記一実施形態においては、作動スイッチ３９Ａ又は３９Ｂの操作入力が継続しつつ切換スイッチ４０の操作入力が中断された連続時間ｔを計測し、この入力中断時間ｔに応じて切換スイッチ４０の操作入力の中断が有効であるかどうかを判定する第１の入力判定手段を設けた構成を例にとって説明したが、これに限られない。すなわち、例えば作動スイッチ３９Ａ，３９Ｂの操作入力に関係なく、切換スイッチ４０の操作入力が中断された連続時間を計測し、この計測した切換スイッチの入力中断時間が所定時間を経過したときに、はじめて切換スイッチ４０の操作入力が中断されたと判定する第２の入力中断判定手段を設けてもよい。この場合も、上記同様の効果を得ることができる。 Further, in the above-described embodiment, the continuous time t when the operation input of the changeover switch 40 is interrupted while the operation input of the operation switch 39A or 39B is continued is measured, and the changeover switch 40 is controlled according to the input interruption time t. Although the configuration in which the first input determination unit that determines whether the interruption of the operation input is effective has been described as an example, the configuration is not limited thereto. That is, for example, the continuous time when the operation input of the changeover switch 40 is interrupted is measured regardless of the operation input of the operation switches 39A and 39B, and only when the measured input interruption time of the changeover switch has passed a predetermined time. You may provide the 2nd input interruption determination means which determines with the operation input of the changeover switch 40 having been interrupted. In this case, the same effect as described above can be obtained.

また、上記一実施形態においては、操作装置３６は、作動スイッチ３９Ａ，３９Ｂ及び切換スイッチ４０からなる３つのスイッチを有し、荷受台昇降装置５における４つの荷受台４の動作（上昇、下降、閉じ、開き動作）を指示可能な構成を例にとって説明したが、これに限られない。すなわち、例えば車両の側面側に荷受台昇降装置５’を追設した場合などにおいて、図８に示すように操作装置３６’に切換スイッチ４６を追設し、この切換スイッチ４６と作動スイッチ３９Ａ又は３９Ｂの同時操作により荷受台昇降装置５’における荷受台４’の昇降動作を指示可能な構成としてもよい。この場合には、４つのスイッチの単独操作及び複数同時操作により、荷受台昇降装置５における４つの荷受台４の動作と荷台昇降装置５’における２つの荷受台４’の動作を合わせた計６つの動作を指示することが可能となる。このような場合にも、上記同様の効果を得ることができる。 In the above-described embodiment, the operation device 36 includes three switches including the operation switches 39A and 39B and the changeover switch 40, and the operations of the four load receiving platforms 4 in the load receiving platform lifting / lowering device 5 (raising, lowering, The configuration in which the closing and opening operations can be instructed has been described as an example, but is not limited thereto. That is, for example, in the case where a cargo receiving platform elevating device 5 ′ is additionally provided on the side surface of the vehicle, a changeover switch 46 is additionally provided in the operation device 36 ′ as shown in FIG. 8, and this changeover switch 46 and the operation switch 39A or It is good also as a structure which can instruct | indicate the raising / lowering operation | movement of load receiving stand 4 'in load receiving stand raising / lowering apparatus 5' by simultaneous operation of 39B. In this case, a total of 6 operations including the operations of the four load receiving platforms 4 in the load receiving platform lifting / lowering device 5 and the operations of the two load receiving platforms 4 ′ in the loading platform lifting / lowering device 5 ′ are performed by operating the four switches individually and simultaneously. One operation can be instructed. Even in such a case, the same effect as described above can be obtained.

なお、以上においては、平行リンクを介し荷受台４の姿勢を維持したまま荷受台４を昇降する昇降駆動部７と、車両の車幅方向を軸芯として荷受台４を略水平となる開放状態又は略鉛直となる閉塞状態まで回動する開閉駆動部８とを備えた荷受台昇降装置５を例にとって説明したが、これに限られない。すなわち、例えば車両の下部側に格納な格納式荷受台昇降装置などに適用してもよいことは言うまでもない。 In the above, the lifting drive unit 7 that moves the load receiving table 4 up and down while maintaining the posture of the load receiving table 4 through the parallel link, and the open state in which the load receiving table 4 is substantially horizontal with the vehicle width direction of the vehicle as the axis. Or although the load receiving table raising / lowering apparatus 5 provided with the opening / closing drive part 8 rotated to the obstruction | occlusion state used as substantially perpendicular | vertical was demonstrated as an example, it is not restricted to this. That is, it goes without saying that the present invention may be applied to, for example, a retractable load receiving device lifting device that is stored on the lower side of the vehicle.

本発明の荷受台昇降装置の一実施形態が適用された車両の全体構造を表す側面図である。1 is a side view showing an overall structure of a vehicle to which an embodiment of a cargo receiving platform lifting apparatus of the present invention is applied. 本発明の荷受台昇降装置の一実施形態の詳細構造を表す斜視図である。It is a perspective view showing the detailed structure of one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. 本発明の荷受台昇降装置の一実施形態を構成する油圧駆動装置の概略構成を一例として表す油圧回路図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a hydraulic circuit diagram illustrating, as an example, a schematic configuration of a hydraulic drive device that constitutes an embodiment of a cargo receiving platform lifting device of the present invention. 本発明の荷受台昇降装置の一実施形態の駆動制御に係わる要部構成を表す電気回路図である。It is an electric circuit diagram showing the principal part structure regarding the drive control of one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. 本発明の荷受台昇降装置の一実施形態を構成する操作装置の外観を表す概略図である。It is the schematic showing the external appearance of the operating device which comprises one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. 本発明の荷受台昇降装置の一実施形態を構成する受信機の制御処理内容を表すフローチャートである。It is a flowchart showing the control processing content of the receiver which comprises one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. 本発明の荷受台昇降装置の一実施形態の動作を説明するためのタイムチャートである。It is a time chart for demonstrating operation | movement of one Embodiment of the cargo receiving stand raising / lowering apparatus of this invention. 本発明の荷受台昇降装置の一変形例を構成する操作装置の外観を表す概略図である。It is the schematic showing the external appearance of the operating device which comprises the modification of the load receiving stand raising / lowering apparatus of this invention.

Explanation of symbols

３荷台
４荷受台
５荷受台昇降装置
７昇降駆動部
８開閉駆動部
１３第１アーム
１４第２アーム
１５第３アーム
３６操作装置（電源切手段）
３７受信機（動作切換無効手段、第１の入力中断判定手段）
３９Ａ作動スイッチ
３９Ｂ作動スイッチ
４０切換スイッチ
４６切換スイッチ 3 Loading platform 4 Loading platform 5 Loading platform lifting device 7 Lifting drive unit 8 Opening / closing drive unit 13 First arm 14 Second arm 15 Third arm 36 Operating device (power-off means)
37 Receiver (Operation switching invalid means, first input interruption judging means)
39A Actuation switch 39B Actuation switch 40 Changeover switch 46 Changeover switch

Claims

In the loading platform lifting device that supports the loading and unloading operations on the loading platform of the vehicle,
At least one loading platform that moves up and down between the loading platform of the vehicle and the ground;
Two operation switches capable of instructing one operation direction and another operation direction of the load receiving table, and at least one changeover switch capable of instructing switching of the operation content of the load receiving table by a plurality of operations with the operation switch, An operating device for transmitting a radio signal for remotely operating the cargo receiving table;
A receiver provided on the vehicle side, which receives a radio signal from the operating device and outputs a corresponding operation command signal;
When the receiver continues the operation of the changeover switch and switches to a plurality of operations with the operation switch, the receiver makes an instruction to change the operation content of the load receiving table by the changeover switch, and the changeover switch and the operation switch outputting an operation command signal corresponding to the plural operating with, when switched to plural operating with the actuating switch and the change-over switch during a single operation of the operating switch, the receiving platform of the operation content switching by the change-over switch as invalid instruction, receiving platform lifting apparatus characterized by comprising an operation switching disabling means to continue the output of the operation command signal corresponding to a single operation of the operating switch.

2. The cargo receiving platform lifting apparatus according to claim 1, wherein one of the operation device and the receiver measures a continuous time in which the operation input of the changeover switch is interrupted while the operation input of the operation switch is continued. A load receiving table comprising first input interruption determining means for determining that the operation input of the changeover switch is interrupted for the first time when the measured input interruption time of the changeover switch has passed a predetermined time. lift device.

2. The load receiving platform lifting / lowering device according to claim 1, wherein one of the operating device and the receiver measures a continuous time when the operation input of the changeover switch is interrupted, and the input interruption of the measured changeover switch is measured. A load receiving platform lifting / lowering device comprising second input interruption determining means for determining that the operation input of the change-over switch is interrupted for the first time when a predetermined time has elapsed.

4. The load receiving platform elevating device according to claim 1, wherein the operation device is a power-off means for switching to a power-off state when a predetermined time elapses without operation of the changeover switch and the operation switch. A cargo receiving platform lifting device characterized by comprising:

5. The load receiving platform lifting / lowering device according to claim 1, wherein the operation device includes power-on means for switching to a power ON state in accordance with an operation of the changeover switch. apparatus.

The load receiving table lifting device according to any one of claims 1 to 5, wherein a lifting drive unit that lifts and lowers the load receiving table while maintaining the posture of the load receiving table via a parallel link, and a vehicle width direction of the vehicle as an axis. An opening / closing drive unit that rotates the load receiving platform as a core to an open state that is substantially horizontal or a closed state that is substantially vertical, and a changeover switch of the operating device is configured to perform a plurality of operations with the operation switch. A load receiving table lifting / lowering device capable of instructing switching of lifting / lowering operation or rotation operation.