JP2023014994A

JP2023014994A - fall prevention device

Info

Publication number: JP2023014994A
Application number: JP2022110708A
Authority: JP
Inventors: 正雄丸山; Masao Maruyama; 雄大鈴木; Yudai Suzuki
Original assignee: Nippon Fruehauf Co Ltd
Current assignee: Nippon Fruehauf Co Ltd
Priority date: 2021-07-19
Filing date: 2022-07-08
Publication date: 2023-01-31

Abstract

To provide a fall prevention device which can solve such a problem that a cargo on a gate plate collapses or falls on the rear side of the gate plate on a safety fence of the gate plate which is arranged in an opening of a vehicle and is moved up/down between the ground surface and the floor surface in the vehicle.SOLUTION: A fall prevention device is provided which is arranged in a safety fence of a gate plate which is arranged in an opening of a vehicle and is moved up/down between the ground surface and a floor surface in the vehicle. The safety fences are a pair of safety fences 20, 30 arranged at opposing positions in end edges 10, 12 in the vehicle width direction of the gate plate 2. A coupling object portion 80 is formed on a rear end of one safety fence 20. A fall prevention belt 91 which can be drawn by an elastic member 93 and delivered from a delivery portion 90 arranged on the rear end of the other safety fence 30 is stored in the other safety fence 30. A coupling end 92 of the fall prevention belt 91 delivered from the delivery portion 90 of the other safety fence 30 is coupled to the coupling object portion 80 of the one safety fence 20.SELECTED DRAWING: Figure 2

Description

本発明は、車両の開口部に配設され地上面と車両内部の床面との間で昇降されるゲート板の安全柵に配設される落下防止装置に関する。 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fall prevention device provided in a safety fence of a gate plate that is provided in an opening of a vehicle and is raised and lowered between the ground surface and the floor surface inside the vehicle.

貨物輸送用の車両であるトラックの荷台は、車輪、はしご型フレーム、サスペンション機構等からなるシャシーフレームに架装されるため、該車両の床面と地面との間に相当の高低差が存在し、荷物の積み下ろしに際して支障となる。 Since the loading platform of a truck, which is a vehicle for transporting cargo, is mounted on a chassis frame consisting of wheels, a ladder-shaped frame, a suspension mechanism, etc., there is a considerable difference in height between the floor of the vehicle and the ground. , which is a hindrance to loading and unloading luggage.

上記した荷物の積み下ろしの荷役作業における作業性を向上し、作業者の負担を軽減するため、荷物を積載する際に使用されるゲート板を地面と荷台の床面との間で昇降されるテールゲート機構が知られている。このようなゲート板は、通常、トラックの後端部分に装着され、ゲート板上の荷物の落下を防止するため、これを水平状態に保ったまま昇降させる構成を備えている。 In order to improve the workability of loading and unloading cargo and reduce the burden on workers, a tail plate that is used when loading cargo is raised and lowered between the ground and the floor of the loading platform. Gating mechanisms are known. Such a gate plate is usually attached to the rear end of the truck, and has a structure in which the gate plate is raised and lowered while being maintained in a horizontal state in order to prevent cargo from falling on the gate plate.

近年においては、作業中の荷物が誤ってゲート板の側縁から脱落、転落するのを防止するために、該ゲート板上にサイドガードを設けることが提案されている（例えば特許文献１を参照）。 In recent years, it has been proposed to provide side guards on the gate plate in order to prevent cargo during work from accidentally falling off the side edge of the gate plate (see, for example, Patent Document 1). ).

また、本出願人によって、夜間、又は暗所において作業する際に、ゲート板の側縁を目視しやすいように、ゲート板の側縁に発光体を配設して、作業者がゲート板の幅方向における端縁を容易に認知することができる技術も提案されている（特許文献２を参照）。 In addition, the present applicant has arranged a light-emitting body on the side edge of the gate plate so that the operator can easily see the side edge of the gate plate when working at night or in a dark place. A technique has also been proposed that allows easy recognition of edges in the width direction (see Patent Literature 2).

さらに、ゲート板上で荷役作業を実施する際に、作業者がバランスを崩すことがある。その際に、作業者が手で掴むことができる安全柵が配設されていると作業者は安心して作業に臨むことができることから、ゲート板の車幅方向の左右両方の端縁部において対向する位置に安全柵を設置することが考えられる。このような技術課題に対し、例えば、車いす等を載せて車両の後方から車内に誘導する昇降可能なゲート板に安全柵を配設し、該ゲート板の開閉に連動して開閉作動する安全柵の機構が提案されている（例えば特許文献３を参照）。 Furthermore, workers may lose their balance when carrying out cargo handling work on the gate plate. At that time, if a safety fence that the worker can grasp by hand is installed, the worker can work with peace of mind. It is conceivable to install a safety fence at the position where In order to solve such a technical problem, for example, a safety fence is provided on a gate plate that can be lifted and lowered to guide a wheelchair or the like from the rear of the vehicle into the vehicle, and the safety fence opens and closes in conjunction with the opening and closing of the gate plate. mechanism has been proposed (see Patent Document 3, for example).

特開２０１７－０３０６２８号公報Japanese Patent Application Laid-Open No. 2017-030628 特開２０１９－００６２４６号公報JP 2019-006246 A 特開平０８－０２０２７７号公報JP-A-08-020277

ところで、上記した先行技術においては、ゲート板の車幅方向の左右両方の端縁部において対向する位置に安全柵を設置した場合であっても、ゲート板の後方側は開放されたままとなる。したがって、該ゲート板上に荷物を載置した状態で該ゲート板を昇降させると、該昇降動作に起因して発生する振動、及び揺動運動によって、該ゲート板上の荷物がゲート板の後方側に崩れたり、落下したりする恐れがある。 By the way, in the prior art described above, even if the safety fences are installed at opposite positions at both the right and left edges of the gate plate in the vehicle width direction, the rear side of the gate plate remains open. . Therefore, when the gate plate is raised and lowered with a load placed on the gate plate, the vibration and rocking motion caused by the lifting operation cause the load on the gate plate to move behind the gate plate. There is a risk of it collapsing or falling.

本発明は、上記事実に鑑みなされたものであり、その主たる技術課題は、車両の開口部に配設され地上面と車両内部の床面との間で昇降されるゲート板の安全柵に、ゲート板上の荷物がゲート板の後方側に崩れたり、落下したりするという問題を解消することができる落下防止装置を提供することにある。 The present invention has been made in view of the above-mentioned facts, and its main technical problem is to provide a safety fence of a gate plate that is arranged at the opening of the vehicle and is raised and lowered between the ground surface and the floor surface inside the vehicle. To provide a fall prevention device capable of solving the problem that baggage on a gate plate collapses or falls behind the gate plate.

上記主たる技術課題を解決するため、本発明によれば、車両の開口部に配設され地上面と車両内部の床面との間で昇降されるゲート板の安全柵に配設される落下防止装置であって、該安全柵は、ゲート板の車幅方向の端縁部において対向する位置に配設される一対の安全柵であって、一方の安全柵の後方端部には、被結合部が形成され、他方の安全柵には、弾性部材により引き込まれると共に該他方の安全柵の後方端部に配設された繰出部から繰り出し可能な落下防止ベルトが収納され、該他方の安全柵の繰出部から繰り出された該落下防止ベルトの結合端部が、該一方の安全柵の該被結合部に結合される落下防止装置が提供される。 In order to solve the above main technical problems, according to the present invention, a fall prevention device is provided in a safety fence of a gate plate that is arranged in an opening of a vehicle and is raised and lowered between the ground surface and the floor surface inside the vehicle. A device, wherein the safety fences are a pair of safety fences disposed at opposite positions on the edge of the gate plate in the vehicle width direction, and the rear end of one of the safety fences is connected to the The other safety fence accommodates a fall prevention belt that is retracted by an elastic member and that can be fed out from a feeding part provided at the rear end of the other safety fence. A fall prevention device is provided in which the connecting end portion of the fall prevention belt let out from the feeding portion is connected to the connected portion of the one safety fence.

該一方の安全柵は、一対の起立部材と、該一対の起立部材の上部を連結する第一手摺部とを備え、該他方の安全柵は、一対の起立部材と、該一対の起立部材の上部を連結する第二手摺部と、を備え、該第二手摺部の後方端部に該繰出部が配設され、該第二手摺部には、該弾性部材によって該第二手摺部の前方側に引かれ第二手摺部の長手方向に沿ってスライド可能に保持されたベルトスライダと、該第二手摺部の内部の該繰出部側に配設され該落下防止ベルトの固定端部が固定されるベルト固定部と、が配設され、該落下防止ベルトは、該固定端部が該ベルト固定部に固定されると共に、該ベルトスライダに配設された巻き掛け部に巻き掛けられ、該落下防止ベルトの結合端部が引かれて該繰出部から該落下防止ベルトが繰り出されるに伴い、該ベルトスライダが該弾性部材の引張力に抗して該繰出部側にスライドするように構成されることが好ましい。 The one safety fence comprises a pair of standing members and a first handrail connecting the upper parts of the pair of standing members, and the other safety fence comprises a pair of standing members and the pair of standing members. a second handrail portion connecting the upper portion thereof, the extension portion being arranged at the rear end portion of the second handrail portion, and the second handrail portion being moved forward of the second handrail portion by the elastic member; A belt slider pulled to the side and held so as to be slidable along the longitudinal direction of the second handrail, and a fixed end portion of the fall prevention belt disposed on the delivery portion side inside the second handrail is fixed. The fall prevention belt has a fixed end fixed to the belt fixing part and is wound around a winding part arranged on the belt slider, As the fall prevention belt is paid out from the delivery portion by pulling the connecting end of the fall prevention belt, the belt slider slides toward the delivery portion against the tensile force of the elastic member. preferably.

該ベルトスライダの該巻き掛け部は、第一巻き掛け部と第二巻き掛け部とを備え、該第二手摺部の該繰出部側にベルト反転部が形成され、該落下防止ベルトは、該固定端部が該ベルト固定部に固定されると共に、該第一巻き掛け部、該ベルト反転部、及び該第二巻き掛け部に順に巻き掛けられ、該落下防止ベルトが該第二手摺部に収納された状態では、該結合端部が該繰出部に位置付けられることが好ましい。そして、該安全柵は、該ゲート板上において畳まれる収納状態と起立状態との間で姿勢の変化が可能な安全柵であってもよい。 The winding portion of the belt slider includes a first winding portion and a second winding portion, a belt reversing portion is formed on the delivery portion side of the second handrail portion, and the fall prevention belt The fixed end portion is fixed to the belt fixing portion, and is sequentially wound around the first winding portion, the belt reversing portion, and the second winding portion, and the fall prevention belt is attached to the second handrail portion. Preferably, in the stowed condition, the coupling end is positioned on the payout. Further, the safety fence may be a safety fence capable of changing its posture between a folded state and a standing state on the gate plate.

本発明の落下防止装置は、車両の開口部に配設され地上面と車両内部の床面との間で昇降されるゲート板の安全柵に配設される落下防止装置であって、該安全柵は、ゲート板の車幅方向の端縁部において対向する位置に配設される一対の安全柵であって、一方の安全柵の後方端部には、被結合部が形成され、他方の安全柵には、弾性部材により引き込まれると共に該他方の安全柵の後方端部に配設された繰出部から繰り出し可能な落下防止ベルトが収納され、該他方の安全柵の繰出部から繰り出された該落下防止ベルトの結合端部が、該一方の安全柵の該被結合部に結合されるものであることから、ゲート板上の荷物がゲート板の後方側に崩れたり、落下したりするという問題を解消することができ、さらには、該他方の安全柵に落下防止ベルトが収納されることから、該落下防止ベルトを使用しない状況においては、該落下防止ベルトが邪魔になることがない。 A fall prevention device according to the present invention is a fall prevention device arranged in a safety fence of a gate plate that is arranged in an opening of a vehicle and is raised and lowered between the ground surface and the floor surface inside the vehicle. The fences are a pair of safety fences arranged at opposite positions at the end edges of the gate plate in the vehicle width direction, one of the safety fences has a rear end formed with a to-be-coupled portion, and the other of the safety fences has a rear end. The safety fence accommodates a fall prevention belt that is retracted by an elastic member and that can be extended from a delivery portion provided at the rear end of the other safety fence, and is extended from the delivery portion of the other safety fence. Since the connecting end of the fall prevention belt is connected to the connected portion of the one safety fence, cargo on the gate plate may collapse or fall behind the gate plate. Since the problem can be solved and the fall prevention belt is housed in the other safety fence, the fall prevention belt does not become an obstacle when the fall prevention belt is not used.

（ａ）本実施形態の安全柵が適用された車両であって、ゲート板に設置された安全柵が収納状態にある斜視図、（ｂ）（ａ）に記載された安全柵が起立状態にある斜視図である。(a) Perspective view of a vehicle to which the safety fence of the present embodiment is applied, in which the safety fence installed on the gate plate is in the stored state, (b) The safety fence described in (a) is in the upright state 1 is a perspective view; FIG. 安全柵に設置される落下防止装置において、落下防止ベルトが繰り出された状態を示す斜視図である。FIG. 4 is a perspective view showing a state in which the fall prevention belt is extended in the fall prevention device installed on the safety fence. 図２に示す落下防止ベルトが第二手摺部に収納された状態を示す斜視図である。3 is a perspective view showing a state in which the fall prevention belt shown in FIG. 2 is accommodated in the second handrail portion; FIG. （ａ）図３に示す第一手摺部及び第二手摺部の一部を透過して示す平面図、（ｂ）（ａ）に示す第二手摺部の内部を透過して示す側面図である。(a) A plan view partially showing the first handrail part and the second handrail part shown in FIG. 3, and (b) A side view showing the inside of the second handrail part shown in (a). . （ａ）図２に示す第一手摺部及び第二手摺部の一部を透過して示す平面図、（ｂ）（ａ）に示す第二手摺部の内部を透過して示す側面図である。(a) A plan view partially transparently showing the first handrail portion and the second handrail portion shown in FIG. 2 , (b) A side view transparently showing the inside of the second handrail portion shown in (a) . 図１（ａ）の第一安全柵及び第一支持基台を拡大して示す斜視図である。It is a perspective view which expands and shows the 1st safety fence and 1st support base of Fig.1 (a). 図２に示す第一安全柵及び第一支持基台の内部を透過して示す側面図である。FIG. 3 is a side view transparently showing the inside of the first safety fence and the first support base shown in FIG. 2 ; 図１に示す第一安全柵の第一係合解除機構を拡大して示す斜視図である。It is a perspective view which expands and shows the 1st engagement release mechanism of the 1st safety fence shown in FIG. 第一安全柵が、収納状態（ａ）から中間状態（ｂ）を経て起立状態（ｃ）へと変化する態様を示す一部を透過して示す側面図である。It is a partially transparent side view showing a mode in which the first safety fence changes from the housed state (a) to the standing state (c) via the intermediate state (b). 第一安全柵が起立状態にある際の第一起立部材及び第一支持基台を拡大して示す斜視図である。It is a perspective view which expands and shows a 1st standing member and a 1st support base when a 1st safety fence exists in a standing state. （ａ）第一手摺部及び落下防止ベルトが収納された別の実施形態の第二手摺部の一部を透過して示す平面図、（ｂ）（ａ）に示す第二手摺部の内部を透過して示す側面図である。(a) A plan view showing a part of the second handrail part of another embodiment in which the first handrail part and the fall prevention belt are accommodated, (b) The inside of the second handrail part shown in (a) It is a side view shown transparently. 図１１の第二手摺部に装着される弾性部材を拡大して示す斜視図である。12 is an enlarged perspective view showing an elastic member attached to the second handrail portion of FIG. 11; FIG. （ａ）図１１に示す第一手摺部及び落下防止ベルトが繰り出された第二手摺部の一部を透過して示す平面図、（ｂ）（ａ）に示す第二手摺部の内部を透過して示す側面図である。(a) A plan view partially showing the first handrail shown in FIG. 11 and the second handrail with the fall prevention belt extended, (b) showing the inside of the second handrail shown in (a) transparent is a side view shown in FIG.

以下、本発明に基づいて構成される落下防止装置に係る実施形態について、添付図面を参照しながら、詳細に説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a fall prevention device configured based on the present invention will be described in detail with reference to the accompanying drawings.

図１には、本実施形態の落下防止装置が適用される箱型荷台１１０（２点鎖線で示している）を有する車両１００が示されている。図１（ａ）には、車両１００の後方に配設され地上面と車両内部の床面との間で昇降されるゲート板２を含むテールゲート機構１３０が示されている。ゲート板２は、車両１００の荷役作業が行われない場合は、箱型荷台１１０の後方の開閉扉１２０に沿って直立させられて格納状態とされ、荷役作業を実施する際には、図１（ａ）に示すように、矢印Ｒ１で示す方向に開かれて水平な状態とされる。なお、図１に矢印で示すＸ方向が車両の前後方向であり、Ｙ方向が車両の幅方向であり、Ｚ方向が上下方向であって、以降の図面においても、このＸＹＺ方向は共通の方向を示すものとする。また、図示の実施形態では、箱型荷台１１０の後方の開閉扉１２０が２枚の観音開きドアで構成されている例を示すが、本発明はこれに限定されず、４枚に分割された開閉扉であったり、箱型荷台１１０の後方の開口の一部がゲート板２によって開閉されたりする構成であってもよい。 FIG. 1 shows a vehicle 100 having a box-type loading platform 110 (indicated by a two-dot chain line) to which the fall prevention device of this embodiment is applied. FIG. 1(a) shows a tailgate mechanism 130 including a gate plate 2 that is arranged behind the vehicle 100 and moves up and down between the ground surface and the floor surface inside the vehicle. When the vehicle 100 is not being used for cargo handling, the gate plate 2 is put upright along the open/close door 120 behind the box-type loading platform 110 and stored. As shown in (a), it is opened in a direction indicated by an arrow R1 to a horizontal state. Note that the X direction indicated by arrows in FIG. 1 is the longitudinal direction of the vehicle, the Y direction is the width direction of the vehicle, and the Z direction is the vertical direction. shall indicate Further, in the illustrated embodiment, an example is shown in which the opening/closing door 120 behind the box-type cargo bed 110 is composed of two double doors, but the present invention is not limited to this, and the opening/closing door is divided into four. It may be a door, or a configuration in which a part of the rear opening of the box-type loading platform 110 is opened and closed by the gate plate 2 .

ゲート板２は、全体が略矩形状で構成され、荷受け面４と、前方端縁部６と、後方端縁部８と、右方端縁部１０と、左方端縁部１２とを備えている。ゲート板２の荷受け面４上の車幅方向の端縁部である右方端縁部１０及び左方端縁部１２には、本実施形態の落下防止装置が適用される一対の安全柵、より具体的には、第一安全柵２０及び第二安全柵３０が対向するように配設されている。第一安全柵２０及び第二安全柵３０は、例えば、合金鋼によって構成され、ゲート板２に畳まれる収納状態（図１（ａ）を参照）と、起立状態（図１（ｂ）を参照）との間で姿勢の変化が可能な安全柵である。なお、第一安全柵２０、第二安全柵３０が起立状態とされた図１（ｂ）では、箱型荷台１１０の後方の開閉扉１２０は開かれた状態となっている（図示は省略している）。 The gate plate 2 has a substantially rectangular shape as a whole, and includes a load receiving surface 4, a front edge 6, a rear edge 8, a right edge 10, and a left edge 12. ing. A pair of safety fences to which the fall prevention device of the present embodiment is applied to the right edge portion 10 and the left edge portion 12, which are the edge portions in the vehicle width direction on the load receiving surface 4 of the gate plate 2, More specifically, the first safety fence 20 and the second safety fence 30 are arranged to face each other. The first safety fence 20 and the second safety fence 30 are made of alloy steel, for example, and can be folded into the gate plate 2 in a retracted state (see FIG. 1(a)) and in an upright state (see FIG. 1(b)). See) is a safety fence that can change its posture between In addition, in FIG. 1B, in which the first safety fence 20 and the second safety fence 30 are in the upright state, the opening/closing door 120 behind the box-shaped loading platform 110 is in an open state (not shown). ing).

第一安全柵２０は、収納状態と起立状態とでゲート板２に対して９０度姿勢が変化する起立部材２４を備えている。該起立部材２４は、車両後方側の第一起立部材２４Ａと、車両前方側の第二起立部材２４Ｂとを含む。第二安全柵３０も、上記した第一安全柵２０と略同様の構成を備えており、上記した収納状態と起立状態とで姿勢が変化する起立部材３４を備えている。該起立部材３４は、収納状態と起立状態とで９０度姿勢が変化する車両後方側の第一起立部材３４Ａと、車両前方側の第二起立部材３４Ｂとを含む。 The first safety fence 20 has an upright member 24 whose posture changes by 90 degrees with respect to the gate plate 2 between the stored state and the upright state. The standing member 24 includes a first standing member 24A on the vehicle rear side and a second standing member 24B on the vehicle front side. The second safety fence 30 also has substantially the same configuration as the first safety fence 20 described above, and includes an upright member 34 whose posture changes between the stored state and the upright state described above. The upright member 34 includes a first upright member 34A on the vehicle rear side and a second upright member 34B on the front side of the vehicle, the attitude of which changes by 90 degrees between the stored state and the upright state.

第一安全柵２０は、ゲート板２の右方端縁部１０の後方に配置され第一起立部材２４Ａの一端側（起立した際に下方となる側）を支持する第一支持基台４０と、前方に配置され第二起立部材２４Ｂの一端側（起立した際に下方となる側）を支持する第二支持基台５０とを備えている。同様に、第二安全柵３０は、ゲート板２の左方端縁部１２の後方に配置され第二安全柵３０の第一起立部材３４Ａの一端側（起立した際に下方となる側）を支持する第一支持基台６０と、前方に配置され第二起立部材３４Ｂの一端側（起立した際に下方となる側）を支持する第二支持基台７０とを備えている。 The first safety fence 20 includes a first support base 40 that is arranged behind the right edge portion 10 of the gate plate 2 and supports one end side of the first upright member 24A (the side that is downward when raised). , and a second support base 50 that is arranged in front and supports one end side (the side that is downward when standing) of the second standing member 24B. Similarly, the second safety fence 30 is arranged behind the left edge portion 12 of the gate plate 2, and one end side of the first upright member 34A of the second safety fence 30 (the side that is downward when raised) is It has a first support base 60 for supporting, and a second support base 70 for supporting one end side (the side that is downward when standing up) of the second upright member 34B arranged in front.

第一安全柵２０は、該第一起立部材２４Ａの他端側（起立した際に上方となる側）と、該第二起立部材２４Ｂの他端側（起立した際に上方となる側）と、を連結する連結部材である第一手摺部２２を備えている。また、該第一起立部材２４Ａと該第二起立部材２４Ｂとは、第一手摺部２２に加え、水平メンバ２６によって連結されている。さらに第一安全柵２０は、第一起立部材２４Ａから車両後方側に延長された柵延長部２７を備えている。 The first safety fence 20 consists of the other end side of the first standing member 24A (the side facing upward when standing) and the other end side of the second standing member 24B (the side facing upward when standing). is provided with a first handrail portion 22 which is a connecting member that connects the . The first upright member 24A and the second upright member 24B are connected by a horizontal member 26 in addition to the first handrail portion 22 . Further, the first safety fence 20 has a fence extension portion 27 that extends from the first upright member 24A toward the vehicle rear side.

第二安全柵３０も、第一安全柵２０と同様に、該第一起立部材３４Ａの他端側（起立した際に上方となる側）と、該第二起立部材３４Ｂの他端側（起立した際に上方となる側）と、を連結する連結部材である第二手摺部３２を備えている。また、該第一起立部材３４Ａと該第二起立部材３４Ｂとは、第二手摺部３２に加え、水平メンバ３６によって連結されている。さらに、第二安全柵３０は、第二起立部材３４Ｂから車両後方側に延長された柵延長部３７を備えている。 Similarly to the first safety fence 20, the second safety fence 30 also has the other end side of the first upright member 34A (the side that is upward when raised) and the other end side of the second upright member 34B (upright side). and a second handrail portion 32 that is a connecting member that connects the upper side when it is closed. The first upright member 34A and the second upright member 34B are connected by a horizontal member 36 in addition to the second handrail portion 32 . Furthermore, the second safety fence 30 includes a fence extension portion 37 that extends from the second upright member 34B toward the vehicle rear side.

本実施形態のゲート板２の車幅方向の端縁部において対向する位置に配設された一対の安全柵を構成する第一安全柵２０及び第二安全柵３０には、以下に図２～６に基づいて説明する落下防止装置が配設される。なお、図２、図３では、ゲート板２が配設される車両１００の箱型荷台１１０は省略されている。 The first safety fence 20 and the second safety fence 30, which constitute a pair of safety fences arranged at opposite positions on the edge of the gate plate 2 in the vehicle width direction of this embodiment, are shown in FIGS. 6 is provided. 2 and 3, the box-type loading platform 110 of the vehicle 100 on which the gate plate 2 is arranged is omitted.

本実施形態の落下防止装置は、図２、図３に示すように、一方の第一安全柵２０の後方端部に形成された略Ｄ字形状の被結合部８０と、他方の第二安全柵３０に収納可能で、該第二安全柵３０の後方端部に配設された繰出部９０から矢印Ｒ８で示す方向に繰り出し可能な落下防止ベルト９１と、落下防止ベルト９１の端部に形成された結合端部９２と、を備えている。第二安全柵３０の繰出部９０から繰り出された落下防止ベルト９１の該結合端部９２は、図に示すように、第一安全柵２０の被結合部８０に結合される。このような落下防止ベルト９１を含む落下防止装置が設定されることにより、例えば、ゲート板２上に荷物を積み上げた状態でゲート板２を昇降させる際に、該荷物が崩れて、ゲート板２から後方に落下することが防止される。また、ゲート板２を車両内部の床面と面一の高さに設定した状態で、作業者が、車両内部とゲート板２との間で荷物を移動させる際に、この落下防止ベルト９１を繰り出して結合端部９２を被結合部８０に結合しておくことで、荷物の落下等に対する作業者の不安が抑制され、作業上の安全がより高まる。 As shown in FIGS. 2 and 3, the fall prevention device of this embodiment includes a substantially D-shaped coupled portion 80 formed at the rear end of one first safety fence 20 and a second safety fence 20 on the other. A fall prevention belt 91 that can be accommodated in the fence 30 and can be extended in the direction indicated by an arrow R8 from a delivery portion 90 disposed at the rear end of the second safety fence 30, and formed at the end of the fall prevention belt 91 and a mating end 92 . The connecting end portion 92 of the fall prevention belt 91 extended from the extending portion 90 of the second safety fence 30 is connected to the connected portion 80 of the first safety fence 20 as shown in the figure. By setting the fall prevention device including the fall prevention belt 91 as described above, for example, when the gate plate 2 is moved up and down with a load piled up on the gate plate 2, the load collapses and the gate plate 2 does not move. prevent falling backwards from the In addition, when the gate plate 2 is set flush with the floor surface inside the vehicle and the worker moves the cargo between the inside of the vehicle and the gate plate 2, the fall prevention belt 91 is used. By pulling out and connecting the connecting end portion 92 to the connected portion 80, the worker's anxiety about the falling of the load is suppressed, and the work safety is further improved.

図３には、上記の落下防止ベルト９１が、第二安全柵３０の第一起立部材３４Ａの上部と第二起立部材３４Ｂの上部とを連結する第二手摺部３２の内部に収納された状態が示されている。落下防止ベルト９１が第二手摺部３２に収納された状態では、フック形状をなす結合端部９２が繰出部９０で止まり後方に露出する。 FIG. 3 shows a state in which the fall prevention belt 91 is accommodated inside the second handrail portion 32 that connects the upper portion of the first standing member 34A and the upper portion of the second standing member 34B of the second safety fence 30. It is shown. When the fall prevention belt 91 is housed in the second handrail portion 32, the hook-shaped connecting end portion 92 stops at the delivery portion 90 and is exposed rearward.

図４（ａ）には、第一安全柵２０の第一手摺部２２と、第二安全柵３０の第二手摺部３２の平面図が示されている（説明の都合上、両者の間隔を詰めて記載している）。図４（ｂ）には、第二手摺部３２の側方図が示されている。なお、図４（ａ）、（ｂ）に記載の第二手摺部３２は、落下防止ベルト９１が第二手摺部３２の内部に収納された状態を示し、説明の都合上、内部の構成を透過して示している。 FIG. 4(a) shows a plan view of the first handrail portion 22 of the first safety fence 20 and the second handrail portion 32 of the second safety fence 30 (for convenience of explanation, the distance between the two is are filled in). FIG. 4B shows a side view of the second handrail portion 32. As shown in FIG. The second handrail portion 32 shown in FIGS. 4A and 4B shows a state in which the fall prevention belt 91 is stored inside the second handrail portion 32, and for convenience of explanation, the internal configuration is shown. It is shown transparently.

図４（ａ）、（ｂ）から理解されるように、該第二手摺部３２の内部には弾性部材９３が配設されている（中間部のばねの形状は省略されている）。該弾性部材９３は、例えば引っ張りコイルばねである。該弾性部材９３の一端部９３ａは、第二手摺部３２の車両前方側（図中左方側）の端部に係止され、他端部９３ｂは、第二手摺部３２内において、長手方向にスライド可能に保持されたベルトスライダ９４の係止部９４ａに係止されている。該ベルトスライダ９４には、上記の落下防止ベルト９１が巻き掛けられる巻き掛け部９５が形成されている。本実施形態の巻き掛け部９５は、第二手摺部３２の長手方向に沿って車両後方側（図中右方側）に配設された第一巻き掛け部９５ａと、車両前方側に配設された第二巻き掛け部９５ｂとを備えている。第二手摺部３２の内部の繰出部９０側には、落下防止ベルト９１の固定端部９１ａが固定されるベルト固定部９６が配設されている。該ベルト固定部９６に固定端部９１ａが固定された落下防止ベルト９１は、まず、ベルトスライダ９４の第一巻き掛け部９５ａに巻き掛けられて反転され、該ベルト固定部９６の近傍に配設されたベルト反転部９７に巻き掛けられて反転され、さらに、ベルトスライダ９４の第二巻き掛け部９５ｂに巻き掛けられて反転され、落下防止ベルト９１の結合端部９２が、第二手摺部３２の繰出部９０に係止される。なお、本実施形態の第二手摺部３２内には、ベルト反転部９７において反転される落下防止ベルト９１が上記のベルト固定部９６と干渉しないように離反させるガイドピン９８も配設されている。上記した構成により、ベルトスライダ９４には、上記した弾性部材９３の引張力が常に作用しており、落下防止ベルト９１は、その全体が第二手摺部３２の内部に引き込まれる。 As understood from FIGS. 4A and 4B, an elastic member 93 is arranged inside the second handrail portion 32 (the shape of the spring in the intermediate portion is omitted). The elastic member 93 is, for example, a tension coil spring. One end portion 93a of the elastic member 93 is engaged with the end portion of the second handrail portion 32 on the front side of the vehicle (left side in the drawing), and the other end portion 93b extends in the second handrail portion 32 in the longitudinal direction. is locked to a locking portion 94a of a belt slider 94 held slidably. The belt slider 94 is formed with a winding portion 95 around which the fall prevention belt 91 is wound. The winding portion 95 of the present embodiment includes a first winding portion 95a disposed on the vehicle rear side (right side in the figure) along the longitudinal direction of the second handrail portion 32, and a first winding portion 95a disposed on the vehicle front side. and a second winding portion 95b. A belt fixing portion 96 to which the fixed end portion 91a of the fall prevention belt 91 is fixed is arranged inside the second handrail portion 32 on the delivery portion 90 side. The fall prevention belt 91 having the fixed end portion 91a fixed to the belt fixing portion 96 is first wound around the first winding portion 95a of the belt slider 94 and reversed, and arranged in the vicinity of the belt fixing portion 96. It is wound around the belt reversing portion 97 that has been turned and is reversed, and is further wound around the second winding portion 95 b of the belt slider 94 and is reversed, and the connecting end portion 92 of the fall prevention belt 91 is connected to the second handrail portion 32 . is latched to the feeding portion 90 of the . In addition, in the second handrail portion 32 of the present embodiment, a guide pin 98 is also disposed for separating the fall prevention belt 91 that is reversed at the belt reversing portion 97 so as not to interfere with the belt fixing portion 96. . Due to the above-described configuration, the tensile force of the elastic member 93 described above always acts on the belt slider 94 , and the fall prevention belt 91 is entirely pulled into the second handrail portion 32 .

上記の構成を備えた落下防止装置において、落下防止ベルト９１を、図２、図５に示す如く繰り出して落下防止ベルト９１の結合端部９２を被結合部８０に結合する場合、作業者は、結合端部９２を掴んで引き、第二手摺部３２の繰出部９０から落下防止ベルト９１を繰り出す。これに伴い、第二手摺部３２の内部に配設されたベルトスライダ９４が、弾性部材９３の引張力に抗して、図４、図５に矢印Ｒ９で示す方向、すなわち繰出部９０側にスライドする。ここで、落下防止ベルト９１の長さは、第二手摺部３２の繰出部９０から繰り出され、該結合端部９２が第一手摺部２２側の被結合部８０に達し、該結合端部９２を該被結合部８０に係合させるだけの遊び分のみを含む長さに設定される。これにより、落下防止ベルト９１をさらに引き出そうとする力が作用しても、必要以上に延びて撓むことが防止され、ゲート板２上に積み上げられた荷物が崩れようとした場合でも、落下防止ベルト９１が該荷物を支持し、該荷物が崩れることが防止される。また、上記したように、落下防止ベルト９１を使用しない場合は、完全に第二手摺部３２の内部に収納されるため、邪魔になることがない。さらに、上記したように、落下防止ベルト９１は、第二手摺部３２の内部において、繰出部９０側のベルト固定部９６と、第二手摺部３２の内部においてスライドするベルトスライダ９４の巻き掛け部９５に巻き掛けられて収納されており、一般的に知られたベルトパーテーション装置のようにロール状に巻き取られるものではないため、第二手摺部３２を格別に太くしたり、ロール状に巻き取る巻き取り部を配設したりする必要がなく、落下防止ベルト９１を太くした場合であっても、外観の構成をシンプルにすることができる。 In the fall prevention device having the above configuration, when the fall prevention belt 91 is extended as shown in FIGS. The connecting end portion 92 is grasped and pulled, and the fall prevention belt 91 is extended from the extension portion 90 of the second handrail portion 32 . Along with this, the belt slider 94 disposed inside the second handrail portion 32 moves in the direction indicated by the arrow R9 in FIGS. slide. Here, the length of the fall prevention belt 91 is extended from the extension portion 90 of the second handrail portion 32, and the connecting end portion 92 reaches the connected portion 80 on the side of the first handrail portion 22, and the connecting end portion 92 is set to a length that includes only play enough to engage the to-be-coupled portion 80 . As a result, even if a force is exerted to pull out the fall prevention belt 91 further, it is prevented from being stretched more than necessary and bent, and even if the baggage piled up on the gate plate 2 is about to collapse, the fall prevention belt 91 is prevented from falling. A belt 91 supports the load and prevents the load from collapsing. Further, as described above, when the fall prevention belt 91 is not used, it is completely housed inside the second handrail portion 32, so that it does not become an obstacle. Furthermore, as described above, the fall prevention belt 91 is provided inside the second handrail portion 32 by the belt fixing portion 96 on the delivery portion 90 side and the belt slider 94 that slides inside the second handrail portion 32. 95 and stored, and unlike a generally known belt partition device, it is not wound into a roll. There is no need to provide a take-up portion, and even if the drop prevention belt 91 is made thicker, the external configuration can be simplified.

また、上記したように、本実施形態の落下防止装置は、いわゆる動滑車を使用してその原理を説明することが可能な作業者の引張力を低減する機構を備えている。より具体的には、巻き掛け部９５を構成する第一巻き掛け部９５ａ及び第二巻き掛け部９５ｂが動滑車に相当し、ベルト反転部９７が定滑車に相当し、第一巻き掛け部９５ａ及び第二巻き掛け部９５ｂが配設されたベルトスライダ９４が、弾性部材９３（引っ張りコイルばね）によって引っ張られていることから、結合端部９２を引いて落下防止ベルト９１を繰り出す場合に必要な引張力は、該動滑車の原理により、上記の機構を備えていない場合に比して１／４に低減される。 Further, as described above, the fall prevention device of this embodiment has a mechanism for reducing the pulling force of the operator, whose principle can be explained by using a so-called movable pulley. More specifically, the first winding portion 95a and the second winding portion 95b constituting the winding portion 95 correspond to moving pulleys, the belt reversing portion 97 corresponds to a fixed pulley, and the first winding portion 95a. And since the belt slider 94 on which the second winding part 95b is arranged is pulled by the elastic member 93 (tension coil spring), it is necessary to draw out the fall prevention belt 91 by pulling the connecting end part 92. Due to the principle of the movable pulley, the tensile force is reduced to 1/4 compared to when the above mechanism is not provided.

上記した実施形態では、本発明に基づき搭載される落下防止装置の落下防止ベルト９１を、第二安全柵３０の第二手摺部３２に収納して繰り出すように構成した例を示したが、本発明はこれに限定されず、例えば、第二手摺部３２に収納することに替えて、第一安全柵２０の第一手摺部２２に落下防止ベルト９１を収納するように構成し、第２安全柵３０の第二手摺部３２の後端側に被結合部８０を形成して、第一安全柵２０の第一手摺部２２から繰り出した落下防止ベルト９１の結合端部９２を、第二安全柵３０の第二手摺部３２の被結合部８０に結合するように構成することもできる。 In the above-described embodiment, an example is shown in which the fall prevention belt 91 of the fall prevention device mounted based on the present invention is housed in the second handrail portion 32 of the second safety fence 30 and fed out, but this The invention is not limited to this. A connecting portion 80 is formed on the rear end side of the second handrail portion 32 of the fence 30, and the connecting end portion 92 of the fall prevention belt 91 extended from the first handrail portion 22 of the first safety fence 20 is connected to the second safety fence 20. It can also be configured to be coupled to the coupled portion 80 of the second handrail portion 32 of the fence 30 .

さらに、上記した実施形態では、落下防止ベルト９１を、第一安全柵２０の第一手摺部２２、又は第二安全柵３０の第二手摺部３２に収納するように構成した例を説明したが、本発明はこれに限定されず、例えば、第一手摺部２２や第二手摺部３２とは別に、第一安全柵２０の第一起立部材２４Ａ及び第二起立部材２４Ｂを水平方向で連結する第一水平メンバ、及び第二安全柵３０の第一起立部材２４Ａ及び第二起立部材２４Ｂを水平方向で連結する第二水平メンバを新規に配設し、該第一水平メンバ、第二水平メンバのいずれか一方に上記した落下防止ベルト９１を収納する構成を配設すると共に、他方側に被結合部８０を形成することで、本発明の落下防止装置を構成することも可能である。 Furthermore, in the above-described embodiment, an example in which the fall prevention belt 91 is housed in the first handrail portion 22 of the first safety fence 20 or the second handrail portion 32 of the second safety fence 30 has been described. However, the present invention is not limited to this. For example, the first upright member 24A and the second upright member 24B of the first safety fence 20 are horizontally connected separately from the first handrail portion 22 and the second handrail portion 32. A first horizontal member and a second horizontal member that horizontally connects the first upright member 24A and the second upright member 24B of the second safety fence 30 are newly provided, and the first horizontal member and the second horizontal member It is also possible to configure the fall prevention device of the present invention by arranging a structure for accommodating the fall prevention belt 91 described above on either one of them and forming the coupled portion 80 on the other side.

上記したように、本実施形態の安全柵（第一安全柵２０、第二安全柵３０）は、ゲート板２上において畳まれる収納状態と起立状態との間で姿勢の変化が可能な安全柵に採用されている。以下に、図１に加え、図６～１０を参照しながら、本実施形態の安全柵の支持構造について説明する。なお、以下に説明する実施形態の安全柵の支持構造は一例にすぎず、本発明の落下防止装置が適用される安全柵の支持構造は、これに限定されない。 As described above, the safety fence (the first safety fence 20 and the second safety fence 30) of this embodiment is a safety fence that can change its posture between the folded state and the standing state on the gate plate 2. used in fences. The support structure of the safety fence of this embodiment will be described below with reference to FIGS. 6 to 10 in addition to FIG. In addition, the support structure of the safety fence of the embodiment described below is merely an example, and the support structure of the safety fence to which the fall prevention device of the present invention is applied is not limited to this.

図６には、図１（ａ）に記載されたゲート板２に対して第一安全柵２０が折り畳まれた状態の第一安全柵２０の第一起立部材２４Ａと、該第一起立部材２４Ａを支持する第一支持基台４０とを拡大して示している。なお、図６では、第一起立部材２４Ａと第一支持基台４０との支持構造を説明する都合上、一部の構成を透過して示している。 FIG. 6 shows a first upright member 24A of the first safety fence 20 in a state where the first safety fence 20 is folded with respect to the gate plate 2 shown in FIG. 1(a), and the first upright member 24A. The first support base 40 that supports the is shown in an enlarged manner. In addition, in FIG. 6, for the convenience of explaining the support structure between the first upright member 24A and the first support base 40, a part of the configuration is shown transparently.

図６に示すように、第一支持基台４０は、ゲート板２の荷受け面４上に固定される矩形平板状のプレート部材４１と、プレート部材４１に対して垂直に、且つ、互いに対向する位置に立設される一対の回転軸支持部材４３、４４と、一対の回転軸支持部材４３、４４をゲート板２の右方端縁部１０側において連結する連結メンバ４５と、回転軸支持部材４３、４４の中間位置に立設され後述する係合部材が係合する被係合部材４６と、を備えている。プレート部材４１は、プレート部材４１の４隅にゲート板２の下方からボルトが挿入され、プレート部材４１の上面でナットＢによって固定される。 As shown in FIG. 6, the first support base 40 includes a rectangular plate-shaped plate member 41 fixed on the load receiving surface 4 of the gate plate 2 and perpendicular to the plate member 41 and facing each other. A pair of rotating shaft support members 43 and 44 erected at positions, a connecting member 45 connecting the pair of rotating shaft support members 43 and 44 on the right edge portion 10 side of the gate plate 2, and a rotating shaft support member. An engaged member 46 is provided at an intermediate position between 43 and 44 and engages with an engaging member described later. The plate member 41 has bolts inserted into the four corners of the plate member 41 from below the gate plate 2 and is fixed by nuts B on the upper surface of the plate member 41 .

該第一起立部材２４Ａの該一端側には、該第一起立部材２４Ａの姿勢が収納状態から起立状態に変化する際に回動中心となる回転軸２４１が配設されている。回転軸２４１は、第一起立部材２４Ａの一端側を延長しＸ方向において対向するように配設された２つの延長プレート２４３、２４４によって支持されると共に、上記した第一支持基台４０の回転軸支持部材４３、４４に回転自在に支持される。 A rotating shaft 241 is arranged on the one end side of the first upright member 24A, and serves as a rotation center when the posture of the first upright member 24A changes from the retracted state to the upright state. The rotary shaft 241 is supported by two extension plates 243 and 244 that extend from one end of the first upright member 24A and are arranged to face each other in the X direction. It is rotatably supported by shaft support members 43 and 44 .

図６に加え、図７も参照しながら、第一起立部材２４Ａと第一支持基台４０とによる支持構造について、さらに詳細に説明する。 The support structure by the first upright member 24A and the first support base 40 will be described in more detail with reference to FIG. 7 in addition to FIG.

第一起立部材２４Ａは、第一起立部材２４Ａの長手方向（図中Ｙ方向）に移動可能に支持された第一連結ロッド２４５を備えている。第一連結ロッド２４５の一端側には、第一連結ロッド２４５と一体的に移動可能に連結されたスライドシャフト２４６が配設され、該スライドシャフト２４６の一端側端部には、係合部材としての回転ローラ２４２が回転自在に支持されている。該スライドシャフト２４６は、第一起立部材２４Ａの延長プレート２４３、２４４を連結するように長手方向に間隔を開けて固定された支持プレート２４８ａ、２４８ｂに対して相対的に移動可能に挿通されると共に、該支持プレート２４８ａ、２４８ｂ間に配設されたコイル状の圧縮ばね２４７を貫通するように配設される。また、該圧縮ばね２４７は、一方が、支持プレート２４８ａに当接すると共に、他方が、スライドシャフト２４６に対して直交する方向に貫通して保持されたピン２４９によって支持されている。このような構成を備えていることにより、第一起立部材２４Ａの回転ローラ２４２は、第一起立部材２４Ａの一端側、すなわち第一支持基台４０の被係合部材４６側に向かって押し付けられる。なお、本実施形態では、上記したように、第一連結ロッド２４５の一端側に別の部材であるスライドシャフト２４６を、連結部２４５ａを介して連結したが、第一連結ロッド２４５とスライドシャフト２４６を一体的に形成するようにしてもよい。 The first upright member 24A includes a first connecting rod 245 supported so as to be movable in the longitudinal direction (the Y direction in the drawing) of the first upright member 24A. A slide shaft 246 is provided on one end side of the first connecting rod 245 so as to be integrally movably connected with the first connecting rod 245, and an end portion on the one end side of the slide shaft 246 is provided as an engaging member. is rotatably supported. The slide shaft 246 is inserted movably relative to support plates 248a, 248b which are longitudinally spaced and fixed to connect the extension plates 243, 244 of the first upright member 24A. , through a coiled compression spring 247 disposed between the support plates 248a and 248b. One side of the compression spring 247 abuts on a support plate 248a, and the other side is supported by a pin 249 that penetrates in a direction perpendicular to the slide shaft 246 and is held. With such a configuration, the rotating roller 242 of the first upright member 24A is pressed toward one end side of the first upright member 24A, that is, toward the engaged member 46 side of the first support base 40. . In this embodiment, as described above, the slide shaft 246, which is another member, is connected to one end side of the first connecting rod 245 via the connecting portion 245a. may be integrally formed.

上記した第一支持基台４０の被係合部材４６は、図７に示すように、第一安全柵２０が収納状態にあるときに係合部材である回転ローラ２４２が係合して第一安全柵２０の収納状態を維持する第一係合凹部４６１と、該第一安全柵２０が起立状態にあるとき該回転ローラ２４２が係合して第一安全柵２０の起立状態を維持する第二係合凹部４６２と、第一係合凹部４６１と第二係合凹部４６２とを接続し、第一安全柵２０の状態が収納状態と起立状態との間で変化する際に該回転ローラ２４２が移動する接続部４６３と、を備えている。 As shown in FIG. 7, the engaged member 46 of the first support base 40 is engaged with a rotating roller 242, which is an engaging member, when the first safety fence 20 is in the retracted state. The first engagement recess 461 that maintains the stored state of the safety fence 20 and the rotating roller 242 that engages when the first safety fence 20 is in the upright state to maintain the upright state of the first safety fence 20. The second engagement recess 462, the first engagement recess 461, and the second engagement recess 462 are connected, and the rotating roller 242 rotates when the state of the first safety fence 20 changes between the retracted state and the standing state. and a connecting portion 463 on which the moves.

上記の説明では、第一起立部材２４Ａ及び第一支持基台４０により構成される支持構造を説明したが、本実施形態の第一安全柵２０では、第二起立部材２４Ｂ及び第二支持基台５０にも、上記した構成と同様の支持構造が配設されている。すなわち、第二起立部材２４Ｂには、上記の第一連結ロッド２４５に相当する第二連結ロッド（図示を省略する）が配設され、該第二連結ロッドの一端側には上記の回転ローラ２４２に相当する回転ローラ（図示を省略する）が配設され、第二支持基台５０には、上記の被係合部材４６に相当する被係合部材（図示を省略する）も配設される。図１、図６から理解されるように、第一安全柵２０には、上記の第一連結ロッド２４５の他端側と図示が省略された第二起立部材２４Ｂの第二連結ロッドの他端側とを連結し水平方向に延びるロッド連結バー２９が配設されている。また、図６の第一起立部材２４Ａの略中央部に形成され該ロッド連結バー２９の芯材２９ｂの端部が挿入される長孔２４０が第二起立部材２４Ｂの略中央部にも形成され、ロッド連結バー２９は、第一起立部材２４Ａ及び第二起立部材２４Ｂの長手方向に平行移動可能に支持される。このような構成を備え、ロッド連結バー２９を該長孔２４０に沿って平行移動させることで、第一起立部材２４Ａの係合部材である回転ローラ２４２、及び第二起立部材２４Ｂの係合部材である回転ローラ（図示は省略する）を、第一起立部材２４Ａ及び第二起立部材２４Ｂの長手方向に沿って移動させることが可能になっている。 In the above description, the support structure configured by the first upright member 24A and the first support base 40 has been described. 50 is also provided with a support structure similar to the configuration described above. That is, the second upright member 24B is provided with a second connecting rod (not shown) corresponding to the first connecting rod 245, and the rotating roller 242 is provided at one end of the second connecting rod. A rotating roller (not shown) corresponding to is arranged, and an engaged member (not shown) corresponding to the above-mentioned engaged member 46 is also arranged on the second support base 50 . 1 and 6, the first safety fence 20 includes the other end of the first connecting rod 245 and the other end of the second connecting rod of the second upright member 24B (not shown). A rod connecting bar 29 extending horizontally connecting the two sides is provided. Further, a long hole 240, which is formed substantially in the center of the first upright member 24A in FIG. 6 and into which the end of the core member 29b of the rod connecting bar 29 is inserted, is also formed in the substantially center of the second upright member 24B. , the rod connecting bar 29 is supported so as to be able to move parallel in the longitudinal direction of the first standing member 24A and the second standing member 24B. With such a configuration, by moving the rod connecting bar 29 in parallel along the long hole 240, the rotating roller 242, which is the engaging member of the first standing member 24A, and the engaging member of the second standing member 24B (not shown) can be moved along the longitudinal direction of the first upright member 24A and the second upright member 24B.

図１、図７に示すように、本実施形態の第一安全柵２０には、上記した被係合部材４６の第一係合凹部４６１、及び第二係合凹部４６２に対する回転ローラ２４２の係合を解除するための係合解除部材として機能する第一係合解除機構２８が配設されている。図１、６～１０を参照しながら、本実施形態の第一係合解除機構２８の構成及び機能について、より具体的に説明する。 As shown in FIGS. 1 and 7, the first safety fence 20 of the present embodiment has a rotating roller 242 that engages the first engaging recess 461 and the second engaging recess 462 of the engaged member 46 described above. A first disengagement mechanism 28 is provided that functions as an disengagement member for disengagement. The configuration and function of the first disengagement mechanism 28 of this embodiment will be described more specifically with reference to FIGS.

本実施形態の第一係合解除機構２８は、図１に示すように、第一手摺部２２における第一起立部材２４Ａと第二起立部材２４Ｂとの間の略中間位置に配設されている。また、図７、図８に示すように、第一係合解除機構２８は、第一起立部材２４Ａの回転ローラ２４２及び第二起立部材２４Ｂの回転ローラ（図示は省略）を第一起立部材２４Ａ及び第二起立部材２４Ｂの他端側（図８では左方側）に引くための索状部材２８１を備えている。索状部材２８１は、例えば、綱、紐、ベルト状の部材を含み、柔軟性を有する滑りの良い部材が好ましく、本実施形態では、樹脂製の平ベルトが採用されている。該索状部材２８１は、ベルトブラケット２８２の固定連結部２８３に固定される一端部２８１ａと、作業者が把持して引っ張る環状に形成された把持部２８１ｂとを備えている。 As shown in FIG. 1, the first disengagement mechanism 28 of the present embodiment is arranged at a substantially intermediate position between the first upright member 24A and the second upright member 24B on the first handrail portion 22. . Further, as shown in FIGS. 7 and 8, the first engagement releasing mechanism 28 moves the rotating roller 242 of the first upright member 24A and the rotating roller (not shown) of the second upright member 24B to the first upright member 24A. and a cord member 281 for pulling to the other end side (left side in FIG. 8) of the second upright member 24B. The cord-like member 281 includes, for example, a rope, a cord, and a belt-like member, and is preferably a member having flexibility and good slippage. In this embodiment, a resin flat belt is employed. The cord-like member 281 has one end portion 281a fixed to the fixed connection portion 283 of the belt bracket 282, and an annular grip portion 281b that is gripped and pulled by the operator.

ベルトブラケット２８２の固定連結部２８３に該一端部２８１ａが固定された索状部材２８１は、上記のロッド連結バー２９に巻き掛けられて反転され、該ベルトブラケット２８２の固定連結部２８３に隣接して配設された固定巻き掛け部２８４に巻き掛けられて一端側に反転される。この構成により、ロッド連結バー２９は、該索状部材２８１の把持部２８１ｂを矢印Ｒ４で示す方向に引くことで第一起立部材２４Ａ及び第二起立部材２４Ｂの長手方向に沿って移動する移動巻き掛け部として機能する。また、ロッド連結バー２９は、図６、図７から理解されるように、中空のパイプ状の外形部２９ａと芯材２９ｂとを少なくとも含み構成され、図８に示すように索状部材２８１を上記の如くＲ４に示す方向に引くことにより、ロッド連結バー２９の外形部２９ａを回転させながら、図中矢印Ｒ５で示す方向に滑らかに移動させることができる。 The cord-like member 281 having the one end 281a fixed to the fixed connecting portion 283 of the belt bracket 282 is wound around the rod connecting bar 29 and turned over to be adjacent to the fixed connecting portion 283 of the belt bracket 282. It is wound around the arranged fixed winding portion 284 and turned over to one end side. With this configuration, the rod connecting bar 29 moves along the longitudinal direction of the first upright member 24A and the second upright member 24B by pulling the grip portion 281b of the rope member 281 in the direction indicated by the arrow R4. Functions as a hook. 6 and 7, the rod connecting bar 29 includes at least a hollow pipe-shaped outer portion 29a and a core member 29b. As shown in FIG. By pulling in the direction indicated by R4 as described above, the outer portion 29a of the rod connecting bar 29 can be smoothly moved in the direction indicated by the arrow R5 while being rotated.

図９には、上記した第一係合解除機構２８を操作することにより、第一安全柵２０が、ゲート板２に畳まれた収納状態（ａ）から、中間状態（ｂ）を経て、起立状態（ｃ）に変化する態様が示されている。 In FIG. 9, by operating the first disengagement mechanism 28, the first safety fence 20 moves from the retracted state (a) folded on the gate plate 2 to the intermediate state (b), and then stands up. A mode of changing to state (c) is shown.

まず、第一安全柵２０が、図９に示す収納状態（ａ）にあるとき、第一起立部材２４Ａの回転ローラ２４２は、圧縮ばね２４７の作用によって被係合部材４６の第一係合凹部４６１側に押し付けられて係合されている。これにより、第一安全柵２０は、収納状態（ａ）で固定されている。ここで、作業者は、上記した第一係合解除機構２８の索状部材２８１の把持部２８１ｂを掴み、図８中矢印Ｒ４で示した方向に引く。ロッド連結バー２９は、上記したように、第一起立部材２４Ａの第一連結ロッド２４５を介して回転ローラ２４２と、第二起立部材２４Ｂの第二連結ロッドを介して回転ローラ（図示は省略する）に連結されている。したがって、索状部材２８１に作用する引張力は、スライドシャフト２４６のピン２４９を介して圧縮ばね２４７の圧縮ばね力に抗する力となって、図９中矢印Ｒ６で示す方向に作用して、被係合部材４６の第一係合凹部４６１に対する回転ローラ２４２の係合が解除される。なお、これと同時に、第二支持基台５０の図示を省略する被係合部材の第一係合凹部に対する第二起立部材２４Ｂの図示を省略する回転ローラの係合も解除される。 First, when the first safety fence 20 is in the stored state (a) shown in FIG. 461 side is pressed and engaged. Thereby, the first safety fence 20 is fixed in the housed state (a). Here, the operator grabs the grip portion 281b of the cord-like member 281 of the first disengagement mechanism 28 and pulls it in the direction indicated by the arrow R4 in FIG. As described above, the rod connecting bar 29 connects the rotating roller 242 via the first connecting rod 245 of the first upright member 24A and the rotating roller (not shown) via the second connecting rod of the second upright member 24B. ). Therefore, the tensile force acting on the cord-like member 281 acts in the direction indicated by the arrow R6 in FIG. The engagement of the rotating roller 242 with the first engaging recess 461 of the engaged member 46 is released. At the same time, the engagement of the rotating roller (not shown) of the second upright member 24B with the first engaging recess of the engaged member (not shown) of the second support base 50 is also released.

図９に示す中間状態（ｂ）から理解されるように、第一安全柵２０を矢印Ｒ７で示す方向に引き起こして、作業者は、第一手摺部２２を掴みながら、さらに、起立状態（ｃ）へ向けて第一安全柵２０の姿勢を変化させることができる。このとき、索状部材２８１からは手を離すことが可能であり、第一起立部材２４Ａの回転ローラ２４２は、被係合部材４６の上記した接続部４６３と接しながら移動させられ、第一安全柵２０が、ゲート板２に対して直立した起立状態（ｃ）となる（図１０も併せて参照）。これにより、圧縮ばね２４７の作用により回転ローラ２４２が、被係合部材４６側に押し付けられて、自動的に第二係合凹部４６２と係合し、起立状態（ｃ）となる（図１０では、説明の都合上、回転軸支持部材４３、４４は省略されている）。また、延長プレート２４３の第一支持基台４０の連結メンバ４５と当接する側には、段差部２４３ａが配設されており、回転ローラ２４２が被係合部材４６の第二係合凹部４６２と係合する際には、該段差部２４３ａが第一支持基台４０の連結メンバ４５と当接する状態となる。なお、他方の延長プレート２４４に対しても同様の形状の段差部が形成されており、該連結メンバ４５に当接する。この結果、該回転ローラ２４２が第二係合凹部４６２に係合して、第一安全柵２０が内側に倒れることを規制すると共に、第一安全柵２０が外側に倒れることを規制して、起立状態（ｃ）の姿勢が良好に維持される。 As can be understood from the intermediate state (b) shown in FIG. 9, the first safety fence 20 is raised in the direction indicated by the arrow R7, and the operator, while holding the first handrail portion 22, enters the standing state (c ), the posture of the first safety fence 20 can be changed. At this time, it is possible to let go of the cord-like member 281, and the rotating roller 242 of the first standing member 24A is moved while being in contact with the above-described connecting portion 463 of the engaged member 46, thereby providing the first safety. The fence 20 is in an upright state (c) standing upright with respect to the gate plate 2 (see also FIG. 10). As a result, the rotating roller 242 is pressed against the engaged member 46 by the action of the compression spring 247 and automatically engages with the second engaging recess 462, resulting in an upright state (c) (see FIG. 10). , the rotating shaft support members 43 and 44 are omitted for convenience of explanation). A stepped portion 243 a is provided on the side of the extension plate 243 that abuts on the connecting member 45 of the first support base 40 , and the rotating roller 242 engages with the second engaging concave portion 462 of the engaged member 46 . When engaged, the stepped portion 243 a comes into contact with the connecting member 45 of the first support base 40 . The other extension plate 244 is also formed with a stepped portion having a similar shape and abuts on the connecting member 45 . As a result, the rotating roller 242 engages with the second engaging recess 462 to prevent the first safety fence 20 from falling inward and to prevent the first safety fence 20 from falling outward. The posture of the standing state (c) is well maintained.

ところで、上記の第一係合解除機構２８は、いわゆる動滑車を使用してその原理を説明することが可能な作業者の引張力を低減する構成を備えている。すなわち、第一係合解除機構２８の固定巻き掛け部２８４がいわゆる定滑車に相当し、ロッド連結バー２９がいわゆる動滑車に相当する。このような構成によれば、作業者が索状部材２８１を引っ張り、圧縮ばね２４７の圧縮ばね力に抗って第一係合凹部４６１に対する回転ローラ２４２の係合を解除する際の力が、該構成を備えていない場合に比して半減される。この結果、作業者が索状部材２８１に作用させることができる引張力の範囲で、圧縮ばね２４７のばね力がより強いものを選択することができ、上記した第一安全柵２０が収納状態（ａ）、又は起立状態（ｃ）とされた際の状態を、より適切に維持することができる。 By the way, the above first disengagement mechanism 28 has a structure that reduces the pulling force of the operator, whose principle can be explained by using a so-called movable pulley. That is, the fixed winding portion 284 of the first engagement release mechanism 28 corresponds to a so-called fixed pulley, and the rod connecting bar 29 corresponds to a so-called movable pulley. According to such a configuration, the force when the operator pulls the cord-like member 281 to release the engagement of the rotating roller 242 with the first engaging recess 461 against the compression spring force of the compression spring 247 is It is halved compared to the case without this configuration. As a result, the operator can select a stronger spring force of the compression spring 247 within the range of tensile force that can be applied to the rope-like member 281, and the first safety fence 20 is in the retracted state ( The state of a) or the standing state (c) can be maintained more appropriately.

第一安全柵２０を起立状態（ｃ）にある状態から、収納状態（ａ）とする場合も、上記の索状部材２８１の把持部２８１ｂを作業者が引っ張り、該引張力が該移動巻き掛け部として機能するロッド連結バー２９に作用して、該第二係合凹部４６２に対する該回転ローラ２４２の係合を解除すると共に、第二起立部材２４Ｂにおける、図示を省略する回転ローラの第二係合凹部に対する係合も解除して、第一安全柵２０を中間状態（ｂ）とした後、ゲート板２に畳まれた収納状態（ａ）とすることができる。 When the first safety fence 20 is changed from the upright state (c) to the retracted state (a), the operator pulls the grip portion 281b of the rope-like member 281, and the pulling force is applied to the moving winding. It acts on the rod connecting bar 29 functioning as a part to release the engagement of the rotating roller 242 with the second engaging recess 462, and the second engagement of the rotating roller (not shown) in the second upright member 24B. After the first safety fence 20 is in the intermediate state (b) by also releasing the engagement with the joint recess, it can be in the retracted state (a) in which the gate plate 2 is folded.

さらに、図１に示す第二安全柵３０も、上記の第一安全柵２０と同様の支持構造を備えており、第二安全柵３０に配設された第二係合解除機構３８の索状部材を引っ張ることにより、第二安全柵３０のロッド連結バー３９を移動して、第二安全柵３０を図１（ａ）に示す収納状態と、図１（ｂ）に示す起立状態との間で容易に作動させることができる（詳細な説明は省略する）。 Furthermore, the second safety fence 30 shown in FIG. 1 also has a support structure similar to that of the first safety fence 20 described above. By pulling the member, the rod connecting bar 39 of the second safety fence 30 is moved to move the second safety fence 30 between the retracted state shown in FIG. 1(a) and the upright state shown in FIG. 1(b). (detailed description is omitted).

上記した実施形態では、落下防止ベルト９１が収納される一方の安全柵において、該落下防止ベルト９１に対し引張力を作用させる弾性部材９３として、引っ張りコイルばねを採用した例を示した。しかし、本発明はこれに限定されず、他の弾性部材を採用する別の実施形態も含む。図１１～１３を参照しながら、他の弾性部材を採用した別の実施形態について以下に説明する。なお、図１１～１３に示す実施形態は、上記した第二安全柵３０を、第二手摺部３２に替えて第二手摺部３２’を採用した第二安全柵３０’とし、該第二手摺部３２’に落下防止ベルト９１を収納する例を示すものであり、図４、５に示す第二の安全柵３０に配設された部材と同一の部材については同一の番号を付しており、詳細な説明については省略する。 In the above-described embodiment, an example in which a tension coil spring is employed as the elastic member 93 that exerts a tensile force on the fall prevention belt 91 in one of the safety fences in which the fall prevention belt 91 is accommodated is shown. However, the invention is not so limited and includes alternative embodiments employing other elastic members. Alternative embodiments employing other elastic members are described below with reference to FIGS. 11-13. In the embodiment shown in FIGS. 11 to 13, the second safety fence 30 described above is replaced with the second handrail 32, and the second handrail 32' is used as the second safety fence 30'. This shows an example in which the fall prevention belt 91 is stored in the portion 32', and the same members as those provided in the second safety fence 30 shown in FIGS. 4 and 5 are given the same numbers. , detailed description is omitted.

図１１（ａ）には、第一安全柵２０の第一手摺部２２と、第二安全柵３０’の第二手摺部３２’の平面図が示されている（説明の都合上、両者の間隔を詰めて記載している）。図１１（ｂ）には、第二手摺部３２’の側方図が示されている。 FIG. 11(a) shows a plan view of the first handrail portion 22 of the first safety fence 20 and the second handrail portion 32' of the second safety fence 30' (for convenience of explanation, both spaced out). FIG. 11(b) shows a side view of the second handrail portion 32'.

図１１（ａ）、（ｂ）から理解されるように、第二手摺部３２’の内部には、図４に基づき説明した弾性部材９３に替えて、ゼンマイばねを含み構成された弾性部材９９が装着されている。図１２を参照しながら、第二手摺部３２’に装着された弾性部材９９についてより具体的に説明する。 As understood from FIGS. 11(a) and 11(b), inside the second handrail portion 32', instead of the elastic member 93 described with reference to FIG. is installed. The elastic member 99 attached to the second handrail portion 32' will be described in more detail with reference to FIG.

図１２に示す弾性部材９９は、複数のゼンマイばねを含み構成されており、ゼンマイばねケース９９１に支持された第一ゼンマイばね９９２、第二ゼンマイばね９９３、及び第三ゼンマイばね９９４を備えている。ゼンマイばねケース９９１は、一対の側壁部９９１ａ、９９１ａと、前壁部９９１ｂと、後壁部９９１ｃとにより構成されている。第一ゼンマイばね９９２を構成する渦巻コイル９９２ａ、第二ゼンマイばね９９３を構成する渦巻コイル９９３ａ、及び第三ゼンマイばね９９４を構成する渦巻コイル９９４ａは金属製の薄板からなり、渦巻コイル９９２ａ、渦巻コイル９９３ａ、及び渦巻コイル９９４ａの一端部は、それぞれ、一対の側壁部９９１ａ、９９１ａに支持された回転軸９９２ｂ、回転軸９９３ｂ、回転軸９９４ｂに固定されている。 The elastic member 99 shown in FIG. 12 includes a plurality of spiral springs, and includes a first spiral spring 992, a second spiral spring 993, and a third spiral spring 994 supported by a spiral spring case 991. . The spiral spring case 991 is composed of a pair of side wall portions 991a, 991a, a front wall portion 991b, and a rear wall portion 991c. A spiral coil 992a constituting the first spiral spring 992, a spiral coil 993a constituting the second spiral spring 993, and a spiral coil 994a constituting the third spiral spring 994 are made of thin metal plates. One ends of 993a and spiral coil 994a are respectively fixed to rotating shafts 992b, 993b and 994b supported by a pair of side wall portions 991a and 991a.

また、渦巻コイル９９２ａ、渦巻コイル９９３ａ、及び渦巻コイル９９４ａの他端部は、重ねられた状態で、リベット等の留め具９９５により連結されて一体とされ、該他端部側には、例えばステンレスで形成されたワイヤ９９７の一端部９９７ａが、例えばボルトナットからなる連結具９９６によって連結されている。弾性部材９９には、上記した構成により、該他端部に連結されたワイヤ９９７を矢印Ｒ１０で示す方向に引き込むエネルギーが蓄えられている。すなわち、ワイヤ９９７を矢印Ｒ１１で示す方向に引き出すと、ワイヤ９９７には、矢印Ｒ１０で示す方向に引っ張る力が作用する。 Further, the other ends of the spiral coil 992a, the spiral coil 993a, and the spiral coil 994a are superimposed and connected together by a fastener 995 such as a rivet. One end portion 997a of the wire 997 formed by is connected by a connector 996 made of, for example, a bolt and nut. Due to the above configuration, the elastic member 99 stores energy for drawing the wire 997 connected to the other end in the direction indicated by the arrow R10. That is, when the wire 997 is pulled out in the direction indicated by the arrow R11, a pulling force acts on the wire 997 in the direction indicated by the arrow R10.

上記した渦巻コイル９９２ａ、渦巻コイル９９３ａ、及び渦巻コイル９９４ａの他端部は、ゼンマイばねケース９９１の後壁部９９１ｃに形成された開口部９９１ｄから引き出される。また、ゼンマイばねケース９９１の前壁部９９１ｂには、複数の雌ネジ孔９９１ｅが形成されており、図１１（ｂ）に示すように、第二手摺部３２’の車両前方側（図中左方側）の端部に、複数のボルト９９８によって固定される。 The other ends of the spiral coil 992a, the spiral coil 993a, and the spiral coil 994a are pulled out from an opening 991d formed in the rear wall portion 991c of the spiral spring case 991. As shown in FIG. A front wall portion 991b of the spiral spring case 991 is formed with a plurality of female screw holes 991e, and as shown in FIG. side) is fixed by a plurality of bolts 998 .

ワイヤ９９７の他端部９９７ｂは、第二手摺部３２’内において、長手方向にスライド可能に保持されたベルトスライダ９４の係止部９４ａに係止される。これにより、ベルトスライダ９４には、上記した弾性部材９９の引張力が作用し、落下防止ベルト９１は、第二手摺部３２’の内部に引き込まれる（ベルトスライダ９４の構成については、先に説明した実施形態の説明を参照）。 The other end portion 997b of the wire 997 is engaged with the engaging portion 94a of the belt slider 94 held so as to be slidable in the longitudinal direction inside the second handrail portion 32'. As a result, the tensile force of the elastic member 99 described above acts on the belt slider 94, and the fall prevention belt 91 is pulled into the second handrail portion 32' (the configuration of the belt slider 94 will be described earlier). see the description of the embodiment described above).

上記した別の実施形態の弾性部材９９を含む落下防止装置において、落下防止ベルト９１を、図１３に示す如く繰り出して落下防止ベルト９１の結合端部９２を被結合部８０に結合する場合、作業者は、結合端部９２を掴み、第二手摺部３２’の繰出部９０から落下防止ベルト９１を引き出す。これに伴い、第二手摺部３２’の内部に配設されたベルトスライダ９４が、弾性部材９９の引張力に抗して、図１１、１３に矢印Ｒ１２で示す方向、すなわち繰出部９０側にスライドする。なお、先に説明した実施形態と同様に、落下防止ベルト９１の長さは、第二手摺部３２’の繰出部９０から繰り出され、該結合端部９２が第一手摺部２２側の被結合部８０に達し、該結合端部９２を該被結合部８０に係合させるだけの遊び分のみを含む長さに設定される。これにより、落下防止ベルト９１をさらに引き出そうとする力が作用しても、必要以上に延びて撓むことが防止され、ゲート板２上に積み上げられた荷物が崩れようとした場合でも、落下防止ベルト９１が該荷物を支持し、該荷物が崩れることが防止される。また、落下防止ベルト９１を使用しない場合は、弾性部材９９の作用により第二手摺部３２’の内部に収納されるため、邪魔になることがない。 In the fall prevention device including the elastic member 99 of another embodiment described above, when the fall prevention belt 91 is extended as shown in FIG. A person grasps the connecting end portion 92 and pulls out the fall prevention belt 91 from the delivery portion 90 of the second handrail portion 32'. Along with this, the belt slider 94 disposed inside the second handrail portion 32′ moves in the direction indicated by the arrow R12 in FIGS. slide. It should be noted that the length of the fall prevention belt 91 is fed out from the feeding portion 90 of the second handrail portion 32', and the connecting end portion 92 is connected to the first handrail portion 22 side as in the above-described embodiment. The length is set to include only play enough to reach the portion 80 and engage the coupling end 92 with the coupled portion 80 . As a result, even if a force is exerted to pull out the fall prevention belt 91 further, it is prevented from being stretched more than necessary and bent, and even if the baggage piled up on the gate plate 2 is about to collapse, the fall prevention belt 91 is prevented from falling. A belt 91 supports the load and prevents the load from collapsing. Also, when the fall prevention belt 91 is not used, it is stored inside the second handrail portion 32' by the action of the elastic member 99, so that it does not become an obstacle.

上記した弾性部材９９は、定荷重ばねとして知られるゼンマイばねを採用していることから、引っ張りコイルばねを採用した場合と比較して、落下防止ベルト９１を引っ張る際の引張力が、引き出し量に関わらず安定する。また、ゼンマイばねを採用していることにより、引っ張りコイルばねと同等の引張力を確保する際のスペースが少なく済む。特に、上記した実施形態のように、小径のゼンマイばねを複数連結することで、必要な引張力を確保しながら、狭い空間で構成された手摺り内に配設することが容易になる。さらに言えば、上記した実施形態では、弾性部材９９の渦巻コイル９９２ａ、渦巻コイル９９３ａ、及び渦巻コイル９９４ａの一端部とベルトスライダ９４とを、ワイヤ９９７によって連結していることから、上記した実施形態のゲート板２とサイズが異なるゲート板、例えば、前後長が短く、幅が広いゲート板に本発明を適用するような場合であっても、ワイヤ９９７の長さを調整することで対応が可能であり、汎用性が高い。なお、弾性部材９９を構成するゼンマイばねの個数は特に限定されず、必要な引張力に応じて適宜調整され、１個である場合も含まれる。また、上記した実施形態では、弾性部材９９の渦巻コイル９９２ａ、渦巻コイル９９３ａ、及び渦巻コイル９９４ａの一端部とベルトスライダ９４とを連結する連結部材として、例えばステンレスのワイヤ９９７によって連結した例を示したが、本発明はこれに限定されず、他の素材のワイヤ、ボールチェーン、ロープ等を連結部材として使用することも可能である。 Since the elastic member 99 employs a spiral spring known as a constant force spring, the tensile force when pulling the fall prevention belt 91 is greater than the pullout amount compared to the case where a tension coil spring is employed. Stable regardless. In addition, by adopting the spiral spring, the space required for securing a tensile force equivalent to that of a tension coil spring can be reduced. In particular, by connecting a plurality of small-diameter flat spiral springs as in the above-described embodiment, it is possible to easily arrange them in a handrail configured in a narrow space while ensuring necessary tensile force. Furthermore, in the above embodiment, one end of the spiral coil 992a, the spiral coil 993a, and the spiral coil 994a of the elastic member 99 and the belt slider 94 are connected by the wire 997. Even when the present invention is applied to a gate plate having a size different from that of the gate plate 2, for example, a gate plate having a short front-to-rear length and a wide width, it can be handled by adjusting the length of the wire 997. and is highly versatile. The number of spiral springs constituting the elastic member 99 is not particularly limited, and is appropriately adjusted according to the required tensile force, including the case of one. Further, in the above-described embodiment, as a connecting member for connecting one end portion of the spiral coil 992a, the spiral coil 993a, and the spiral coil 994a of the elastic member 99 to the belt slider 94, for example, a stainless steel wire 997 is used for connection. However, the present invention is not limited to this, and it is also possible to use other materials such as wires, ball chains, and ropes as connecting members.

２：ゲート板
４：荷受け面
６：前方端縁部
８：後方端縁部
１０：右方端縁部
１２：左方端縁部
２０：第一安全柵
２２：第一手摺部
２４：起立部材
２４Ａ：第一起立部材
２４１：回転軸
２４２：回転ローラ
２４３、２４４：延長プレート
２４５：第一連結ロッド
２４６：スライドシャフト
２４７：圧縮ばね
２４Ｂ：第二起立部材
２６：水平メンバ
２７：柵延長部
２８：第一係合解除機構
２８１：索状部材
２８１ａ：一端部
２８１ｂ：把持部（他端部）
２８２：ベルトブラケット
２８３：固定連結部
２８４：固定巻き掛け部
２９：ロッド連結バー
２９ａ：外形部
２９ｂ：芯材
３０、３０’：第二安全柵
３２、３２’：第二手摺部
３４：起立部材
３４Ａ：第一起立部材
３４Ｂ：第二起立部材
３６：水平メンバ
３７：柵延長部
３８：第二係合解除機構
３９：ロッド連結バー
４０：第一支持基台
４１：プレート部材
４３、４４：回転軸支持部材
４５：連結メンバ
４６：被係合部材
４６１：第一係合凹部
４６２：第二係合凹部
４６３：接続部
５０：第二支持基台
６０：第一支持基台
７０：第二支持基台
８０：被結合部
９０：繰出部
９１：落下防止ベルト
９２：結合端部
９３：弾性部材（引っ張りコイルばね）
９３ａ：一端部
９３ｂ：他端部
９４：ベルトスライダ
９４ａ：係止部
９５：巻き掛け部
９５ａ：第一巻き掛け部
９５ｂ：第二巻き掛け部
９６：ベルト固定部
９７：ベルト反転部
９８：ガイドピン
９９：弾性部材（ゼンマイばね）
９９１：ゼンマイばねケース
９９１ａ：側壁部
９９１ｂ：前壁部
９９１ｃ：後壁部
９９２：第一ゼンマイばね
９９２ａ：渦巻コイル
９９２ｂ：回転軸
９９３：第二ゼンマイばね
９９３ａ：渦巻コイル
９９３ｂ：回転軸
９９４：第三ゼンマイばね
９９４ａ：渦巻コイル
９９４ｂ：回転軸
９９５：留め具
９９６：連結具
９９７：ワイヤ
９９８：ボルト
１００：車両
１１０：箱型荷台
１２０：開閉扉
１３０：テールゲート機構 2: Gate plate 4: Load receiving surface 6: Front edge 8: Rear edge 10: Right edge 12: Left edge 20: First safety fence 22: First handrail 24: Standing member 24A: First upright member 241: Rotating shaft 242: Rotating roller 243, 244: Extension plate 245: First connecting rod 246: Slide shaft 247: Compression spring 24B: Second upright member 26: Horizontal member 27: Fence extension 28 : first disengagement mechanism 281: cord-like member 281a: one end portion 281b: grip portion (other end portion)
282: Belt bracket 283: Fixed connection part 284: Fixed winding part 29: Rod connection bar 29a: External shape part 29b: Core material 30, 30': Second safety fences 32, 32': Second handrail part 34: Standing member 34A: First upright member 34B: Second upright member 36: Horizontal member 37: Fence extension 38: Second engagement release mechanism 39: Rod connecting bar 40: First support base 41: Plate members 43, 44: Rotation Shaft support member 45: Coupling member 46: Engaged member 461: First engagement recess 462: Second engagement recess 463: Connection portion 50: Second support base 60: First support base 70: Second support Base 80: Coupling Part 90: Feeding Part 91: Fall Prevention Belt 92: Coupling End 93: Elastic Member (Tension Coil Spring)
93a: One end 93b: Other end 94: Belt slider 94a: Engagement part 95: Winding part 95a: First winding part 95b: Second winding part 96: Belt fixing part 97: Belt reversing part 98: Guide Pin 99: elastic member (spring)
991: spiral spring case 991a: side wall portion 991b: front wall portion 991c: rear wall portion 992: first spiral spring 992a: spiral coil 992b: rotary shaft 993: second spiral spring 993a: spiral coil 993b: rotary shaft 994: second spiral spring Three-spring spring 994a: Spiral coil 994b: Rotating shaft 995: Fastener 996: Connector 997: Wire 998: Bolt 100: Vehicle 110: Box-type cargo bed 120: Opening/closing door 130: Tailgate mechanism

Claims

A fall prevention device arranged in a safety fence of a gate plate arranged in an opening of a vehicle and raised and lowered between the ground surface and the floor surface inside the vehicle,
The safety fences are a pair of safety fences arranged at opposite positions at the edges of the gate plate in the vehicle width direction,
A connecting part is formed at the rear end of one of the safety fences,
The other safety fence accommodates a fall prevention belt that is retracted by an elastic member and that can be extended from a delivery portion provided at the rear end of the other safety fence, and is delivered from the delivery portion of the other safety fence. a fall prevention device in which the connecting end of the fall prevention belt is connected to the connected portion of the one safety fence.

The one safety fence comprises a pair of standing members and a first handrail connecting the upper parts of the pair of standing members,
The other safety fence comprises a pair of standing members and a second handrail connecting the upper parts of the pair of standing members,
The extending portion is disposed at the rear end portion of the second handrail portion,
The second handrail portion includes a belt slider pulled toward the front side of the second handrail portion by the elastic member and held so as to be slidable along the longitudinal direction of the second handrail portion; a belt fixing portion disposed on the feeding portion side of the belt fixing portion to which the fixed end portion of the fall prevention belt is fixed;
The fall prevention belt has the fixed end portion fixed to the belt fixing portion and is wound around a winding portion provided on the belt slider,
As the fall prevention belt is paid out from the delivery portion by pulling the connecting end of the fall prevention belt, the belt slider slides toward the delivery portion against the tensile force of the elastic member. The fall prevention device according to claim 1.

The winding portion of the belt slider includes a first winding portion and a second winding portion,
A belt reversing portion is formed on the feeding portion side of the second handrail portion,
The fall prevention belt has the fixed end portion fixed to the belt fixing portion and is wound around the first winding portion, the belt reversing portion, and the second winding portion in order, and the fall prevention belt 3. The fall prevention device according to claim 2, wherein the coupling end is positioned on the extending portion when the handrail is stored in the second handrail portion.

4. The fall prevention device according to any one of claims 1 to 3, wherein said safety fence is a safety fence capable of changing its posture between a folded state and a standing state on said gate plate.