JP3857776B2

JP3857776B2 - Carriage for transportation

Info

Publication number: JP3857776B2
Application number: JP10950097A
Authority: JP
Inventors: 哲也村上; 成伸田辺
Original assignee: Gifu Plastic Industry Co Ltd
Current assignee: Gifu Plastic Industry Co Ltd
Priority date: 1997-04-25
Filing date: 1997-04-25
Publication date: 2006-12-13
Anticipated expiration: 2017-04-25
Also published as: JPH10297497A

Description

【０００１】
【発明の属する技術分野】
本発明は、コンテナなどの荷物を載せて運搬するために用いられる運搬用台車に関するものである。
【０００２】
【従来の技術】
この種の運搬用台車として、連結手段を設けたものが特開平７−２５７３８４号公報等で提供されているものがある。
図１１はその一例を示すものであり、矩形状の台盤１の下面の四隅に走行用車輪２を装着して走行自在に形成し、台盤１の一方の端部に持手ハンドル３を脱着自在に取り付けるようにしてある。この種の運搬用台車は、持手ハンドル３を押すだけでなく、持手ハンドル３を手で掴んで引っ張ることによって台盤１を走行させることがある。特にスーパー等の通路の狭い店内では、走行の安全上、持手ハンドル３を手で掴んで引っ張ることによって台盤１を走行させることが通常行なわれている。
【０００３】
そして台盤１の他方の端部には下方へ突出する係合突部４が設けてあり、また台盤１の持手ハンドル３を取り付けた一方の端部には上方へ開口する係合凹部５が設けてあり、台盤１の係合突部４を他の台盤１の係合凹部５に上方から挿入係合させることによって、複数の台盤１を前後に連結することができるようにしてある。このものにあって、先頭の台盤１の持手ハンドル３を掴んで図１１のａ矢印に引くことによって、連結した複数の台盤１を同時に走行させることができ、多くの荷物を運搬することが可能になるのである。
【０００４】
【発明が解決しようとする課題】
しかし、先頭の台盤１の持手ハンドル３を掴んで図１１のａ矢印方向に引くと、この先頭の台盤１の後部には前の走行用車輪２を支点として図１１のｂ矢印のような持ち上げ力が作用する。特に台盤１の上に荷物を載せていない空のときにこの持ち上げ力が作用すると、先頭の台盤１の後部は浮き上がり易い。そしてこのように先頭の台盤１の後部が浮き上がると、この先頭の台盤１の後端部の係合突部４は次の台盤１の前端部の係合凹部５から上方へ抜けてしまい、台盤１の連結が外れ易いという問題があった。
【０００５】
また、図１２は台盤１の連結部の詳細構造を示すものであり、係合突部４と係合凹部５とを係合させて連結した台盤１をａ矢印方向に走行させるにあたって、地面Ｇに段差などの不陸があると、図１２に示すようにこの不陸の上を台盤１が通過する際に台盤１が傾き、係合凹部５に対する係合突部４の係合角度が変化して、係合凹部５内で係合突部４が傾動することになり、この結果、係合突部４が傾動する際に係合凹部５の内面がこじられて、図１２にイ、ロで示す係合凹部５の底部の両角部にクラック等の破損が生じるおそれがあるという問題があった。
【０００６】
本発明は上記の点に鑑みてなされたものであり、台盤を連結して走行させるにあたって、台盤の後部が浮いても連結が外れ難く、しかも不陸を乗り越えて台盤を走行させる際に係合凹部に破損が生じることを防ぐことができる運搬用台車を提供することを目的とするものである。
【０００７】
【課題を解決するための手段】
本発明に係る運搬用台車は、台盤１の下面に走行用車輪２を設けて走行自在に形成し、台盤１の一方の端部に持手ハンドル３を設けると共にこの持手ハンドル３を引いて走行させるようにした運搬用台車において、持手ハンドル３を設けた側の台盤１の一方の端部に下方へ突出する係合突部４を設けると共に係合突部４の下端面を走行方向と平行な面での断面形状が凸円弧状となった凸湾曲面４ａに形成し、台盤１の他方の端部に他の台盤１に設けた係合突部４が挿入係合自在な係合凹部５を上方へ開口させて設けると共に係合凹部５の底面を走行方向と平行な面での断面形状が凹円弧状となった凹湾曲面５ａに形成して成ることを特徴とするものである。
【０００８】
また請求項２の発明は、台盤１の一方の側端部に横係合突部６，６′を設けると共に横係合突部６，６′の先端面を走行方向と直交する面での断面形状が凸円弧状となった凸湾曲面６ａに形成し、台盤１の他方の側端部に他の台盤１に設けた横係合突部６，６′が挿入係合自在な横係合凹部７，７′を設けると共に横係合凹部７，７′の底面を走行方向と直交する面での断面形状が凹円弧状となった凹湾曲面７ａに形成して成ることを特徴とするものである。
【０００９】
【発明の実施の形態】
以下、本発明の実施の形態を説明する。
図２及び図３は樹脂成形品で矩形状に形成した台盤１を示すものであり、台盤１の下面の四隅の車輪装着部１２にキャスタなどで形成される走行用車輪２を装着するようにしてある（図６（ｃ）、図７（ａ）参照。図３において走行用車輪２の図示は省略）。また台盤１の上面にはこの車輪装着部１２の真上位置において段積み用凹部１３が凹設してあり、台盤１の上に他の台盤１を積み重ねると、下の台盤１の段積み用凹部１３に上の台盤１の走行用車輪２が嵌まり込み、多数枚の台盤１を安定して上下に積み重ねることができるようにしてある。さらに台盤１の両側部には、手を差し込んで台盤１を手で掴んで持つことができるようにした持ち手用孔１４が設けてある。台盤１の前端面には上面が開口する一対のハンドル挿入筒１５が固着してあり、略門型に形成される持手ハンドル３の両側の下端部をハンドル挿入筒１５に差し込むことによって、持手ハンドル３を脱着自在に台盤１に取り付けることができるようにしてある。１６は台盤１の上面に全面に亘って多数設けた防滑用突起である。
【００１０】
台盤１の一方の端面、例えば走行方向の前端面の中央部の上部には、図２及び図３に示されるように、平面コ字形の前連結部１８が前方へ一体に延出して設けてあり、前連結部１８の内周は上下に開口する開口部１９となっている。従ってこの開口部１９に手を差し入れて前連結部１８を掴んで台盤１を持つことが可能である。そして前連結部１８の前片１８ａは図６（ａ）に示すように下方へ突出する係合用突部４として形成してある。この係合用突部４は断面下向き開口コ字形に形成してあり、その内側に図３及び図６（ａ）に示すように複数片のリブ片２０が設けてある。この各リブ片２０の下端面は図６（ａ）に示すように、台盤１の走行方向と平行な面での断面形状が凸円弧状となった凸湾曲面４ａに形成してある。
【００１１】
また台盤１の他方の端面、例えば走行方向の後端面の中央部の下部には、図２及び図３に示されるように、一対の切欠部２１の間に形成される後連結部２２が一体に設けてある。この後連結部２２の先端縁の上面には立ち上がり片２３が一体に突設してあり、台盤１の後端面の上部とこの立ち上がり片２３の間に図６（ａ）に示すように上方へ開口する係合凹部５が形成されるようにしてある。この係合凹部５の底面は図６（ａ）に示すように、台盤１の走行方向と平行な面での断面形状が凹円弧状となった凹湾曲面５ａに形成してある。この凹湾曲面５ａの曲率半径は、前記の係合用突部４の凸湾曲面４ａの曲率半径より若干大き目に形成してある。
【００１２】
また、台盤１の一方の側端面の下部に全長に亘って横連結部２５が図２のように側方へ一体に延出して設けてあり、横連結部２５の先端縁の上面には前部と後部の２箇所においてそれぞれ図５（ａ）のように横係合突部６を上方へ突出させて一体に設けてある。横係合突部６の上端面は図７（ａ）に示すように、台盤１の走行方向と直交する面での断面形状が凸円弧状となった凸湾曲面６ａに形成してある。このように横係合突部６を突設することによって、横係合突部６と台盤１の側端面の上部との間に図７（ａ）に示すように上方へ開口する横係合凹部７が形成されるようにしてある。この横係合凹部７の底面は、台盤１の走行方向と直交する面での断面形状が凹円弧状となった凹湾曲面７ａに形成してある。
【００１３】
さらに台盤１の他方の側端部の下面に前記の横連結部２５に設けた横係合突部６に対応する前部と後部の２箇所においてそれぞれ横係合突部６′を下方へ突出させて一体に設けてある。横係合突部６′は図３に示すように複数片のリブ片２６で形成されるものであり、各リブ片２６の下端面は図７（ａ）に示すように、台盤１の走行方向と直交する面での断面形状が凸円弧状となった凸湾曲面６ａに形成してある。このように横係合突部６′を突設することによって、横係合突部６′と台盤１の下面の車輪装着部１２の側面との間に図７（ａ）に示すように下方へ開口する横係合凹部７′が形成されるようにしてある。この横係合凹部７′の上底面は、台盤１の走行方向と直交する面での断面形状が凹円弧状となった凹湾曲面７ａに形成してある。尚、凹湾曲面７ａの曲率半径は、凸湾曲面６ａの曲率半径より若干大き目に形成してある。
【００１４】
そして、上記のように台盤１の走行方向の前端に設けたハンドル挿入筒１５に略門型の持手ハンドル３の下端部を差し込むことによって、図８のように台盤１に持手ハンドル３を脱着自在に装着することができるものであり、持手ハンドル３の上端部を手で掴んで引くことによって、図８のａ矢印方向に台盤１を走行させることができ、台盤１の上に積載したコンテナ等の荷物を運搬することができる。
【００１５】
次に、台盤１を前後方向に連結するにあたっては、前の台盤１（図９の１ａ）の後端部の係合凹部５に後の台盤１（図９の１ｂ）の前端部の係合突部４を上方から挿入係合させることによって行なうことができる。同様にして後の台盤１にさらに他の台盤１を連結することができるものであり、先頭以外の台盤１には持手ハンドル３を装着しないで使用するのが一般的である。そして、先頭の台盤１に装着した持手ハンドル３の上端部を手で掴んで引くことによって、複数連結した台盤１を同時に走行させることができるものであり、複数の台盤１の上に多量の荷物を積載して運搬することができるものである。
【００１６】
このように先頭の台盤１の持手ハンドル３を手で掴んで引くことによって、前後方向に複数連結した台盤１を走行させるにあたって、持手ハンドル３を図８のａ矢印方向に引くと、先頭の台盤１の後部には前の走行用車輪２を支点として図８のｂ矢印のような持ち上げ力が作用するが、図９のように前の台盤１ａの後端部の係合凹部５の上に後の台盤１ｂの係合突部４が係合されているので、図９のｂ矢印のように先頭の台盤１ａの後部が浮き上がっても、係合突部４と係合凹部５の係合は外れることはない。従って、先頭の台盤１の連結が外れることを防ぐことができるものである。
【００１７】
また、上記のように係合突部４と係合凹部５を係合させて前後方向に複数連結した台盤１を走行させるにあたって、地面Ｇに段差などの不陸があると、図１に示すようにこの不陸の上をａ矢印方向に走行する台盤１が通過する際に台盤１が前後方向に傾き、係合凹部５に対する係合突部４の係合角度が変化し、係合凹部５内で係合突部４が傾動するが、係合突部４の下端は凸湾曲面４ａに、係合凹部５の底面は凹湾曲面５ａにそれぞれ形成してあるので、凸湾曲面４ａと凹湾曲面５ａが相互に摺動し合って係合突部４は係合凹部５内でスムーズに傾動する。従って、係合突部４が傾動する際に係合凹部５の内面がこじられるようなことがなくなり、係合凹部５にクラック等の破損が生じることを防ぐことができるものである。
【００１８】
次に、台盤１を横方向に連結するにあたっては、図１０に示すように、一方の台盤１ｃの横係合凹部７に他方の台盤１ｄの横係合突部６′を挿入係合すると共に、他方の台盤１ｄの横係合凹部７′に一方の台盤１ｃの横係合突部６を挿入係合することによって、行なうことができるものである。このように台盤１を横方向に連結することによって、台盤１の全体としての横方向の幅を広くすることができ、大きな面積の荷物を運搬することが可能になるものである。
【００１９】
また、上記のように横係合突部６，６′と横係合凹部７，７′を係合させて横方向に複数連結した台盤１を走行させるにあたって、不陸のある地面を走行する際に台盤１が横方向に傾き、横係合凹部７，７′内で横係合突部６，６′が傾動しても、横係合突部６，６′の先端は凸湾曲面６ａに、横係合凹部７，７′の底面は凹湾曲面７ａにそれぞれ形成してあるので、凸湾曲面６ａと凹湾曲面７ａが相互に摺動し合って横係合突部６，６′は横係合凹部７，７′内でスムーズに傾動する。従って、横係合突部６，６′が傾動する際に横係合凹部７，７′の内面がこじられるようなことがなくなり、横係合凹部７，７′にクラック等の破損が生じることを防ぐことができるものである。
【００２０】
【発明の効果】
上記のように本発明は、台盤の下面に走行用車輪を設けて走行自在に形成し、台盤の一方の端部に持手ハンドルを設けると共にこの持手ハンドルを引いて走行させるようにした運搬用台車において、持手ハンドルを設けた側の台盤の一方の端部に下方へ突出する係合突部を設けると共に、台盤の他方の端部に他の台盤に設けた係合突部が挿入係合自在な係合凹部を上方へ開口させて設けたので、係合突部と係合凹部を係合して前後方向に連結した台盤を、先頭の台盤を持手ハンドルを引いて走行させるにあたって、持手ハンドルを引くことによって先頭の台盤の後部が浮き上がっても、この台盤の後部の係合凹部の上に後の台盤の係合突部が係合されており、係合突部と係合凹部の係合は外れることはなく、台盤の連結が外れることを防ぐことができるものである。しかも、係合突部の下端面を走行方向と平行な面での断面形状が凸円弧状となった凸湾曲面に形成し、係合凹部の底面を走行方向と平行な面での断面形状が凹円弧状となった凹湾曲面に形成したので、係合突部と係合凹部を係合させて前後方向に連結した台盤を走行させるにあたって、不陸のある地面を通過する際に台盤が傾き、係合凹部に対する係合突部の係合角度が変化して係合凹部内で係合突部が傾動しても、係合突部の下端の凸湾曲面と係合凹部の底面の凹湾曲面が相互に摺動し合って係合突部は係合凹部内でスムーズに傾動するものであり、係合突部が傾動する際に係合凹部の内面がこじられるようなことがなくなって、係合凹部にクラック等の破損が生じることを防ぐことができるものである。
【００２１】
また請求項２の発明は、台盤の一方の側端部に横係合突部を設けると共に、台盤の他方の側端部に他の台盤に設けた横係合突部が挿入係合自在な横係合凹部を設けたので、横係合突部と横係合凹部の係合で台盤を横方向に連結することができるものであり、台盤の全体としての横方向の幅を広くすることができ、大きな面積の荷物を運搬することが可能になるものである。しかも、横係合突部の先端面を走行方向と直交する面での断面形状が凸円弧状となった凸湾曲面に形成し、横係合凹部の底面を走行方向と直交する面での断面形状が凹円弧状となった凹湾曲面に形成するようにしたので、横係合突部と横係合凹部を係合させて横方向に連結した台盤を走行させるにあたって、不陸のある地面を走行する際に台盤が横方向に傾いて横係合凹部内で横係合突部が傾動しても、横係合突部の先端の凸湾曲面と横係合凹部の底面の凹湾曲面が相互に摺動し合って横係合突部は横係合凹部内でスムーズに傾動するものであり、係合突部が傾動する際に横係合凹部の内面がこじられるようなことがなくなって、横係合凹部にクラック等の破損が生じることを防ぐことができるものである。
【図面の簡単な説明】
【図１】本発明の実施の形態の一例における台盤を前後方向に連結した状態の一部の断面図である。
【図２】同上の台盤の平面図である。
【図３】同上の台盤の底面図である。
【図４】同上の台盤を示すものであり、（ａ）は正面図、（ｂ）は背面図である。
【図５】同上の台盤を示すものであり、（ａ），（ｂ）は左右の側面図である。
【図６】同上の台盤を示すものであり、（ａ）は図２のＡ−Ａ断面図、（ｂ）は図２のＢ−Ｂ断面図、（ｃ）は図２のＣ−Ｃ断面図である。
【図７】同上の台盤を示すものであり、（ａ）は図２のＥ−Ｅ断面図、（ｂ）は図２のＤ−Ｄ断面図である。
【図８】同上の持手ハンドルを装着した状態の側面図である。
【図９】同上の台盤を前後方向に連結した状態の一部の断面図である。
【図１０】同上の台盤を横方向に連結した状態の一部の断面図である。
【図１１】従来例の概略側面図である。
【図１２】従来例の一部の断面図である。
【符号の説明】
１台盤
２走行用車輪
３持手ハンドル
４係合突部
４ａ凸湾曲面
５係合凹部
５ａ凹湾曲面
６，６′ 横係合突部
６ａ凸湾曲面
７，７′ 横係合凹部
７ａ凹湾曲面[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carriage used for carrying a cargo such as a container.
[0002]
[Prior art]
As this type of transporting carriage, there is one provided with connecting means provided in Japanese Patent Laid-Open No. 7-257384.
FIG. 11 shows an example of this. A traveling wheel 2 is attached to the four corners of the lower surface of the rectangular base 1 so that it can run freely. A handle handle 3 is attached to one end of the base 1. It is designed to be detachable. In this type of transporting cart, not only the handle handle 3 is pushed, but also the platform 1 is caused to travel by grasping and pulling the handle handle 3 by hand. In particular, in a store with a narrow passage such as a supermarket, for the safety of traveling, it is common practice to cause the platform 1 to travel by grasping and pulling the handle handle 3 by hand.
[0003]
The other end of the base 1 is provided with an engaging protrusion 4 that protrudes downward, and the engaging recess that opens upward at one end of the base 1 to which the handle handle 3 is attached. 5 so that a plurality of bases 1 can be connected back and forth by inserting and engaging the engaging protrusions 4 of the base 1 with the engaging recesses 5 of the other base 1 from above. It is. In this case, by grasping the handle handle 3 of the head base 1 and pulling it on the arrow a in FIG. 11, a plurality of connected bases 1 can be run simultaneously, and a large amount of luggage is carried. It becomes possible.
[0004]
[Problems to be solved by the invention]
However, when the handle handle 3 of the top base 1 is grabbed and pulled in the direction of the arrow a in FIG. 11, the rear traveling wheel 2 is a fulcrum at the rear of the top base 1 as indicated by the arrow b in FIG. Such lifting force acts. In particular, if this lifting force is applied when the load is not placed on the platform 1, the rear portion of the top platform 1 tends to float. When the rear part of the top base 1 is lifted in this way, the engagement protrusion 4 at the rear end of the top base 1 is pulled upward from the engagement recess 5 at the front end of the next base 1. Therefore, there is a problem that the connection of the base plate 1 is easily disconnected.
[0005]
FIG. 12 shows the detailed structure of the connecting portion of the base plate 1. When the base plate 1 connected by engaging the engaging protrusion 4 and the engaging concave portion 5 is traveled in the direction of arrow a, If there is unevenness such as a step on the ground G, as shown in FIG. 12, the platform 1 tilts when the platform 1 passes over the unevenness, and the engagement protrusion 4 engages with the engagement recess 5. The engagement angle changes, and the engagement protrusion 4 tilts in the engagement recess 5. As a result, when the engagement protrusion 4 tilts, the inner surface of the engagement recess 5 is distorted. There is a problem that breakage such as cracks may occur at both corners of the bottom of the engagement recess 5 indicated by 12 and 12 in FIG.
[0006]
The present invention has been made in view of the above points, and when connecting and running the platform, it is difficult to disconnect even if the rear part of the platform floats, and when traveling the platform over the unevenness It is an object of the present invention to provide a transport carriage that can prevent the engagement recess from being damaged.
[0007]
[Means for Solving the Problems]
Dolly according to the present invention, running freely formed a road wheels 2 provided on the lower surface of the weighing table 1, the grip hand handle 3 provided on one end of the weighing table 1 Rutotomoni this grip hand handle 3 In the transporting carriage that is driven by pulling, an engaging protrusion 4 that protrudes downward is provided at one end of the base 1 on the side on which the handle handle 3 is provided, and below the engaging protrusion 4. An end surface is formed on a convex curved surface 4a having a convex arcuate cross-sectional shape in a plane parallel to the traveling direction, and an engaging protrusion 4 provided on the other base 1 is provided at the other end of the base 1. An engaging recess 5 that can be freely inserted and engaged is provided so as to open upward, and the bottom surface of the engaging recess 5 is formed as a concave curved surface 5a in which the cross-sectional shape in a plane parallel to the traveling direction is a concave arc shape. It is characterized by this.
[0008]
The invention of claim 2 is a plane ahead end surface orthogonal to the running direction of the 'transverse engagement projection 6,6 provided with a' lateral engagement projection 6,6 on one side end of the weighing table 1 Are formed on a convex curved surface 6a having a convex arcuate cross-sectional shape, and lateral engagement protrusions 6 and 6 'provided on the other base plate 1 can be inserted and engaged freely at the other side end of the base plate 1. The lateral engagement recesses 7 and 7 'are provided, and the bottom surfaces of the lateral engagement recesses 7 and 7' are formed on a concave curved surface 7a in which the cross-sectional shape in a plane orthogonal to the traveling direction is a concave arc shape. It is characterized by.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below.
FIGS. 2 and 3 show a base 1 formed of a resin molded product in a rectangular shape, and traveling wheels 2 formed of casters or the like are attached to four wheel mounting portions 12 on the bottom surface of the base 1. (See FIG. 6 (c) and FIG. 7 (a). In FIG. 3, illustration of the traveling wheel 2 is omitted). Further, a stacking recess 13 is formed on the top surface of the base plate 1 at a position directly above the wheel mounting portion 12. When another base plate 1 is stacked on the base plate 1, the bottom base plate 1 The traveling wheel 2 of the upper base 1 is fitted in the stacking recess 13 so that a large number of the bases 1 can be stacked up and down stably. Further, on both sides of the base 1, a handle hole 14 is provided so that a hand can be inserted and the base 1 can be held and held. A pair of handle insertion cylinders 15 whose upper surfaces are open are fixed to the front end surface of the base 1, and by inserting the lower end portions on both sides of the handle handle 3 formed in a substantially gate shape into the handle insertion cylinder 15, The handle handle 3 can be detachably attached to the base 1. A number of anti-slip projections 16 are provided on the upper surface of the base 1 over the entire surface.
[0010]
As shown in FIGS. 2 and 3, a planar U-shaped front connecting portion 18 is integrally provided on one end surface of the base plate 1, for example, at the upper portion of the central portion of the front end surface in the traveling direction. The inner periphery of the front connecting portion 18 is an opening 19 that opens up and down. Therefore, it is possible to hold the base 1 by inserting a hand into the opening 19 and holding the front connecting portion 18. And the front piece 18a of the front connection part 18 is formed as the protrusion 4 for engagement which protrudes below, as shown to Fig.6 (a). The engaging projection 4 is formed in a U-shaped section with a downward cross section, and a plurality of pieces of rib pieces 20 are provided on the inner side thereof as shown in FIGS. 3 and 6A. As shown in FIG. 6A, the lower end surface of each rib piece 20 is formed on a convex curved surface 4 a having a convex arc shape in cross section on a plane parallel to the traveling direction of the base 1.
[0011]
Further, as shown in FIGS. 2 and 3, a rear connecting portion 22 formed between the pair of cutout portions 21 is provided at the lower end of the other end surface of the base plate 1, for example, the central portion of the rear end surface in the traveling direction. It is provided integrally. A rising piece 23 is integrally projected on the upper surface of the front end edge of the rear connecting portion 22, and the upper portion between the upper end of the rear end surface of the base plate 1 and the rising piece 23 as shown in FIG. An engaging recess 5 is formed to open. As shown in FIG. 6A, the bottom surface of the engaging recess 5 is formed as a concave curved surface 5a having a concave arc shape in cross section in a plane parallel to the traveling direction of the table 1. The radius of curvature of the concave curved surface 5a is slightly larger than the radius of curvature of the convex curved surface 4a of the engaging projection 4.
[0012]
Further, a horizontal connecting portion 25 is provided in the lower part of one side end surface of the base plate 1 so as to extend sideways integrally as shown in FIG. 2, and on the upper surface of the front end edge of the horizontal connecting portion 25. As shown in FIG. 5 (a), the lateral engagement protrusions 6 are provided integrally at the front part and the rear part so as to protrude upward. As shown in FIG. 7A, the upper end surface of the lateral engagement protrusion 6 is formed as a convex curved surface 6a having a convex arc shape in cross-section on a surface orthogonal to the traveling direction of the base plate 1. . By projecting the lateral engagement projection 6 in this way, the lateral engagement opens upward as shown in FIG. 7A between the lateral engagement projection 6 and the upper portion of the side end surface of the base plate 1. A joint recess 7 is formed. The bottom surface of the laterally engaging recess 7 is formed on a concave curved surface 7 a having a concave arc shape in cross section on a plane orthogonal to the traveling direction of the base 1.
[0013]
Further, the lateral engagement protrusions 6 ′ are moved downward at the front and rear portions corresponding to the lateral engagement protrusions 6 provided on the lateral connection part 25 on the lower surface of the other side end of the base 1. It protrudes and is provided integrally. As shown in FIG. 3, the lateral engagement protrusion 6 ′ is formed by a plurality of pieces of rib pieces 26, and the lower end surface of each rib piece 26 is formed on the base 1 as shown in FIG. The cross-sectional shape in the surface orthogonal to the running direction is formed on the convex curved surface 6a having a convex arc shape. As shown in FIG. 7 (a), the lateral engagement projection 6 'is provided in this manner, so that the lateral engagement projection 6' and the side surface of the wheel mounting portion 12 on the lower surface of the base plate 1 are provided. A lateral engagement recess 7 'that opens downward is formed. The upper bottom surface of the lateral engagement recess 7 ′ is formed on a concave curved surface 7 a having a concave arc shape in cross section on a plane orthogonal to the traveling direction of the base 1. The radius of curvature of the concave curved surface 7a is slightly larger than the radius of curvature of the convex curved surface 6a.
[0014]
Then, by inserting the lower end portion of the substantially gate-shaped handle handle 3 into the handle insertion tube 15 provided at the front end in the traveling direction of the base plate 1 as described above, the handle handle is attached to the base plate 1 as shown in FIG. 3 can be detachably mounted, and by holding and pulling the upper end of the handle handle 3 by hand, the platform 1 can be run in the direction of arrow a in FIG. It is possible to carry packages such as containers loaded on top.
[0015]
Next, when connecting the base plate 1 in the front-rear direction, the front end portion of the rear base plate 1 (1b in FIG. 9) is engaged with the engaging recess 5 in the rear end portion of the front base plate 1 (1a in FIG. 9). The engaging protrusion 4 can be inserted and engaged from above. Similarly, another base 1 can be connected to the subsequent base 1 and is generally used without attaching the handle handle 3 to the base 1 other than the top. Then, by holding and pulling the upper end of the handle handle 3 attached to the top base 1 by hand, a plurality of connected bases 1 can be run simultaneously. A large amount of luggage can be loaded and transported.
[0016]
In this way, when the plurality of bases 1 connected in the front-rear direction are run by grasping and pulling the handle handle 3 of the top base 1 by hand, when the handle 3 is pulled in the direction of arrow a in FIG. A lifting force as shown by an arrow b in FIG. 8 acts on the rear portion of the head base 1 with the front traveling wheel 2 as a fulcrum, but the rear end portion of the front base 1a as shown in FIG. Since the engaging protrusion 4 of the rear base 1b is engaged on the joint recess 5, even if the rear part of the leading base 1a is lifted as indicated by the arrow b in FIG. And the engagement recess 5 is not disengaged. Therefore, it is possible to prevent the leading base 1 from being disconnected.
[0017]
Further, when the ground G has a uneven surface such as a step when the base plate 1 is connected in the front-rear direction by engaging the engagement protrusions 4 and the engagement recesses 5 as described above, FIG. As shown, when the platform 1 traveling in the direction of arrow a passes over this unevenness, the platform 1 is tilted in the front-rear direction, and the engagement angle of the engagement projection 4 with respect to the engagement recess 5 changes, The engagement protrusion 4 tilts in the engagement recess 5, but the lower end of the engagement protrusion 4 is formed on the convex curved surface 4a, and the bottom surface of the engagement recess 5 is formed on the concave curved surface 5a. The curved surface 4 a and the concave curved surface 5 a slide against each other, and the engagement protrusion 4 smoothly tilts in the engagement recess 5. Therefore, the inner surface of the engaging recess 5 is not twisted when the engaging protrusion 4 tilts, and damage such as cracks can be prevented from occurring in the engaging recess 5.
[0018]
Next, when connecting the base plate 1 in the horizontal direction, as shown in FIG. 10, the horizontal engagement protrusion 6 'of the other base plate 1d is inserted into the horizontal engagement recess 7 of the one base plate 1c. At the same time, the lateral engagement protrusion 6 of one base 1c is inserted into and engaged with the lateral engagement recess 7 'of the other base 1d. By connecting the platform 1 in the lateral direction in this way, the lateral width of the platform 1 as a whole can be increased, and a large area of luggage can be transported.
[0019]
Further, as described above, when traveling the platform 1 in which the lateral engagement protrusions 6, 6 ′ and the lateral engagement recesses 7, 7 ′ are engaged and connected in the lateral direction, the vehicle travels on uneven ground. In this case, even if the base 1 is inclined in the lateral direction and the lateral engagement protrusions 6 and 6 'tilt in the lateral engagement recesses 7 and 7', the tips of the lateral engagement protrusions 6 and 6 'are convex. Since the bottom surfaces of the laterally engaging recesses 7 and 7 'are formed on the curved surface 6a and the concavely curved surface 7a, the convexly curved surface 6a and the concavely curved surface 7a slide against each other to form the laterally engaging protrusions. 6, 6 'tilts smoothly in the lateral engagement recesses 7, 7'. Therefore, when the lateral engagement protrusions 6 and 6 'tilt, the inner surfaces of the lateral engagement recesses 7 and 7' are not twisted, and damage such as cracks occurs in the lateral engagement recesses 7 and 7 '. This can be prevented.
[0020]
【The invention's effect】
The present invention as described above, to form freely travel provided road wheels to the lower surface of the weighing table, Rutotomoni provided grip hand handle at one end of the weighing table so as to travel by pulling this grip hand handle In the transport cart, an engagement protrusion projecting downward is provided at one end of the base on the side where the handle handle is provided, and provided on the other base at the other end of the base. Since the engagement recess is provided with an engagement recess that allows the engagement protrusion to be freely inserted and engaged, the base plate that is engaged in the engagement protrusion and the engagement recess and connected in the front-rear direction is used as the top base plate. Even if the rear part of the first base plate is lifted by pulling the handle handle when pulling the handle handle, the rear base engagement protrusions will be placed on the rear base engagement recess. The engagement protrusions and the engagement recesses are not disengaged, and it is possible to prevent the platform from being disconnected. It is those that can. In addition, the lower end surface of the engaging protrusion is formed into a convex curved surface whose cross-sectional shape in a plane parallel to the traveling direction is a convex arc shape, and the bottom surface of the engaging recess is a cross-sectional shape in a plane parallel to the traveling direction. Is formed on a concave curved surface having a concave arc shape, and when traveling a platform that is connected in the front-rear direction by engaging the engagement protrusion and the engagement recess, when passing through the uneven ground Even if the base is inclined and the engagement angle of the engagement protrusion with respect to the engagement recess changes to cause the engagement protrusion to tilt within the engagement recess, the convex curved surface and the engagement recess at the lower end of the engagement protrusion The concave curved surfaces of the bottom surface of each of the sliding surfaces slide with each other so that the engaging protrusion smoothly tilts in the engaging concave portion, and the inner surface of the engaging concave portion is twisted when the engaging protruding portion tilts. It is possible to prevent breakage such as cracks from occurring in the engaging recess.
[0021]
According to the invention of claim 2, the lateral engagement protrusion is provided at one side end of the base, and the lateral engagement protrusion provided on the other base is inserted into the other side end of the base. Since the laterally engaging recess that can be freely combined is provided, the base can be connected in the lateral direction by the engagement of the laterally engaging protrusion and the laterally engaging concave. The width can be increased, and a large-area baggage can be transported. In addition, the front end surface of the lateral engagement protrusion is formed into a convex curved surface having a convex arc shape in cross section at the surface orthogonal to the traveling direction, and the bottom surface of the lateral engagement recess is formed at the surface orthogonal to the traveling direction. Since the cross-sectional shape is formed on a concave curved surface having a concave arc shape, when running a platform that is connected laterally by engaging the lateral engagement protrusion and the lateral engagement recess, Even when the platform tilts laterally when traveling on a certain ground and the lateral engagement protrusion tilts in the lateral engagement recess, the convex curved surface at the tip of the lateral engagement protrusion and the bottom surface of the lateral engagement recess The concave curved surfaces of each other slide with each other and the lateral engagement protrusion smoothly tilts in the lateral engagement recess. When the engagement protrusion tilts, the inner surface of the lateral engagement recess is twisted. It is possible to prevent the occurrence of breakage such as cracks in the lateral engagement recess.
[Brief description of the drawings]
FIG. 1 is a partial cross-sectional view of a state in which bases in an example of an embodiment of the present invention are connected in the front-rear direction.
FIG. 2 is a plan view of the same platform.
FIG. 3 is a bottom view of the same platform.
4A and 4B show the same platform, wherein FIG. 4A is a front view and FIG. 4B is a rear view.
FIGS. 5A and 5B show the same platform, and FIGS. 5A and 5B are left and right side views. FIGS.
6A and 6B show the same platform, wherein FIG. 6A is a cross-sectional view taken along the line AA in FIG. 2, FIG. 6B is a cross-sectional view taken along the line BB in FIG. It is sectional drawing.
7A and 7B show the same platform, wherein FIG. 7A is a cross-sectional view taken along line EE in FIG. 2, and FIG. 7B is a cross-sectional view taken along line DD in FIG.
FIG. 8 is a side view showing a state where the handle handle is attached.
FIG. 9 is a partial cross-sectional view showing a state in which the same platform is connected in the front-rear direction.
FIG. 10 is a partial cross-sectional view of a state in which the same platform is connected in the horizontal direction.
FIG. 11 is a schematic side view of a conventional example.
FIG. 12 is a partial cross-sectional view of a conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Driving wheel 3 Handle handle 4 Engaging protrusion 4a Convex curved surface 5 Engaging concave part 5a Concave curved surface 6, 6 'Lateral engaging projecting part 6a Convex curved surface 7, 7' Lateral engaging concave part 7a Concave curved surface

Claims

Weighing table of to the lower surface of the road wheels to freely travel provided to the formation, in the dolly which is adapted to travel by subtracting the Rutotomoni this grip hand handle provided grip hand handle at one end of the weighing table, lifting An engaging protrusion that protrudes downward is provided at one end of the platform on the side where the hand handle is provided, and the lower end surface of the engaging protrusion has a convex arc shape in a plane parallel to the traveling direction. An engaging recess provided on the other base is provided with an engaging recess that can be freely inserted and engaged at the other end of the base, and the bottom surface of the engaging concave is provided on the other end of the base. A carriage for transportation characterized in that it is formed on a concave curved surface whose cross-sectional shape in a plane parallel to the traveling direction is a concave arc shape.

A lateral engagement protrusion is provided on one side end of the base plate, and a tip surface of the lateral engagement protrusion is formed into a convex curved surface in which a cross-sectional shape in a plane orthogonal to the traveling direction is a convex arc shape, A cross section of the side surface of the other side of the base plate in a plane perpendicular to the traveling direction is provided with a side engagement concave portion in which the side engagement protrusion provided on the other base plate can be freely inserted and engaged. 2. The transport carriage according to claim 1, wherein the carriage is formed on a concave curved surface having a concave arc shape.