JP2015205669A - Transport carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transport carriage capable of performing a longitudinal row storage simply.SOLUTION: A transport carriage 1 comprises: a body part 2 having wheels 21; and a movable part 3 having an upper stage deck face part 31 and a lower stage deck face part 33 and made movable relative to the body part 2. The distance from a rotation axis R1 in the upper stage deck face part 31 to the connection part of a link part 35 is made longer than the distance from a rotation axis R2 in the lower stage deck face part 33 to the connection part of the link part 35. In the storage state, the movable part 3 is made so movable that the upper stage deck face part 31 and the lower stage deck face part 33 may rotate upward, and the leading end side of the lower stage deck face part 33 falls forward to abut against the upper stage deck face part 31 so that the upper stage deck face part 31 is supported on the lower stage deck face part 33.

Description

  The present invention relates to a transport cart that can be stored in a row so as to overlap each other in the front-rear direction.

  Conventionally, for example, in a factory, various transport carts are used to efficiently transport parts and commodities. As such a transport cart, as described in Patent Document 1, a cart having two upper and lower base plates is known.

  The transport carriage described in Patent Document 1 includes an upper base plate and a lower base plate having a rotation shaft on the rear end side, and a leg portion rotatably connected to the front end of the upper base plate. Sometimes, the lower end of the leg is inserted into the guide tube of the lower base plate, and the upper base plate and the lower base plate are held horizontally. On the other hand, when storing, the lower end of the leg portion is first detached from the guide tube and rotated with the upper end as a fulcrum so as to approach the upper base plate. Next, after the upper base plate is rotated to the vertical posture, it is lowered along the rear leg and stored in a predetermined position. Thereafter, the lower base plate is rotated to a position slightly exceeding the vertical position, and the upper end of the lower base plate is brought into contact with a predetermined position to maintain the posture. Thereby, a plurality of transport carts can be stored in a column so as to overlap each other.

JP 2006-111221 A

  Here, in the transport cart, as described above, when storing in a row, it is necessary to rotate after removing the leg portion, store by rotating the upper cart, or rotate and hold the lower cart. Therefore, there is a risk that the number of steps increases and the operation becomes complicated.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the conveyance trolley | bogie which can be stored in cascade easily.

  The vehicle trolley according to the present invention made to solve the above problems is a trolley that can be stored in a cascade so as to overlap each other in the front-rear direction, and includes a main body portion having wheels, an upper load carrier surface portion, and a lower load carrier surface portion. A movable portion that is movable relative to the main body portion, and the base end sides of the upper and lower cargo bed surface portions are pivotally supported with respect to the main body portion via rotation axes along the width direction, respectively. The leading ends of the upper and lower loading platform surface portions are connected to each other via a link portion, and the distance from the rotation axis to the connection portion of the link portion in the upper loading platform surface portion is the connecting portion of the rotation shaft to the link portion in the lower loading platform surface portion. In the use state, the upper load bed surface portion and the lower load bed surface portion extend along the horizontal direction, and in the stored state, the upper load bed surface portion and the lower load bed surface portion are in the state of use. The movable portion is movable to rotate toward the tip side of the lower loading platform surface is in contact with the upper bed surface is fell dramatically forward, upper bed surface in the lower loading platform surface is supported.

  According to this transport cart, when storing in tandem so as to overlap each other in the front-rear direction, as long as the movable part is moved so that the upper stage bed surface part and the lower stage bed surface part rotate upward from the state of use, the tip side of the lower stage carrier surface part is It falls forward and comes into contact with the upper load carrier surface portion, and the upper load carrier surface portion is supported by the weight of the lower load carrier surface portion, and the movable portion is locked. Therefore, it can be easily stored in tandem.

  Further, the main body portion further includes a jumping upper portion, the movable portion further includes a jumping guide, and the jumping guide is moved to the upper loading platform surface portion and the lower loading platform when another transport carriage located rearward approaches. It is preferable that the surface portion is pushed up at the top of the other transport cart so that the surface portion rotates upward.

  According to this transporting cart, when another transporting cart is approached from the rear, the jumping guide is pushed up by the jumping upper portion of the other transporting cart, and the used state is changed from the use state to the housed state. That is, as long as another carriage is approached from the rear, the carriage that has been stored at the end changes from the use state to the storage state. Therefore, it can be more easily stored in tandem.

  The movable part further has a pull-back guide that engages with a main body part of another transport carriage that is positioned rearward in the stored state, and the pull-back guide is configured to move the upper load carrier when the other transport cart is separated. It is preferable that the surface portion and the lower loading platform surface portion are pulled by the main body portion of the other transport cart so as to rotate downward.

  According to this transport cart, when the other transport cart behind is separated (retracted), the pull-back guide is pulled by the main body of the other transport cart, and is brought into use from the stored state. That is, as long as the transport cart stored at the end is pulled back, the transport cart in front of which the transport cart is connected is changed from the stored state to the use state. Therefore, among the plurality of transport carts stored in tandem, the last transport cart can be always placed in use.

  And a brake mechanism for restricting the movement of the main body, and a handle provided on the movable part and connected to the brake mechanism via the brake link. The brake link is applied to the handle by an external force. When the brake mechanism is not acting, the movement of the main body is restricted while the brake mechanism is in an activated state, and when the external force is acting on the handle part, the restriction of the movement of the main body is caused to be deactivated with the brake mechanism being inoperative. In the stored state, it is preferable that an external force is not applied to the handle portion, the brake mechanism is in an activated state, and the movement of the main body portion is restricted.

  According to this transport cart, since the brake is applied even in the storage state, it is possible to prevent the transport cart from moving unintentionally during storage, and the convenience and safety can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, the conveyance trolley | bogie which can be stored in cascade easily can be provided.

(A) is a perspective view which shows the conveyance trolley | bogie which concerns on one Embodiment, (b) is a schematic perspective view which shows a mode that the several trolley | bogie was accommodated in cascade. (A)-(c) is a schematic perspective view explaining the process from which a conveyance trolley becomes a storage state from a use state. (A)-(d) is a schematic side view explaining the process of FIG. (A)-(c) is a schematic perspective view explaining the process in which a conveyance trolley is newly accommodated in the tail end. (A)-(d) is a schematic side view explaining the process of FIG. (A)-(c) is a schematic perspective view explaining the process in which the last conveyance trolley is taken out. (A)-(d) is a schematic side view explaining the process of FIG. (A) is a schematic perspective view explaining a brake mechanism, (b) is a schematic front view which shows the brake mechanism of an operation state. (A)-(b) is a schematic side view explaining the process in which a brake mechanism changes from an operation state to a non-operation state, (c) is a schematic front view which shows the brake mechanism of a non-operation state. (A) And (b) is a schematic side view explaining the process from which a conveyance trolley becomes a storage state from a use state.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the drawings. In the following description, the same reference numerals are used for the same or corresponding elements, and duplicate descriptions are omitted. Moreover, the normal traveling direction (arrow direction of Fig.1 (a)) of the conveyance trolley 1 is made into the front, the width direction of the conveyance trolley 1 is made into the left-right direction, and a perpendicular direction is demonstrated as an up-down direction.

  First, the main configuration of the transport carriage 1 will be described with reference to FIGS. The transport cart 1 is for efficiently transporting parts and the like in a factory, for example, and includes a main body portion 2 having wheels 21 and a movable portion 3 movable with respect to the main body portion 2. The movable part 3 has an upper stage carrier surface part 31 and a lower stage carrier surface part 33 on which components and the like can be placed.

At the time of use (during normal use), the transport cart 1 is in a use state in which the upper load carrier surface portion 31 and the lower load carrier surface portion 33 extend along the horizontal direction, as shown in FIG. On the other hand, at the time of storage, as shown in FIG. 1 (b), the upper stage cargo bed surface portion 31 and the lower stage cargo bed surface portion 33 are in the storage state extending along the vertical direction so that at least a part of the main body 2 overlaps each other. It is stored in tandem in a compact state (so that the area wraps in the top view of the transport cart).
FIG. 1B shows a state in which four transport carts 1 </ b> A to 1 </ b> D are stored in tandem as an example. At the time of storage, the transport carts 1B to 1D other than the last are stored in the stored state, and the last transport cart 1A is stored in the used state. In FIG. 1B, some members are omitted for easy understanding, and this point is the same in FIGS. 4 and 6 described later.

  The main body 2 has a substantially U-shaped lower frame 22 in a top view that becomes wider toward the front end side (front side), and two leg portions 23 that extend in the vertical direction and are connected to the front end of the lower frame 22. And a protruding portion 25 provided on each leg portion 23 and protruding rearward, and a jumping bar (upward portion) 27 provided continuously with an intermediate portion of the leg portion 23. The two leg portions 23 are connected via a connecting frame 24 at an intermediate portion thereof. The protruding portion 25 is provided so as to protrude in the vicinity of the upper side of the lower frame 22 in the leg portion 23, more specifically, between the connection point of the lower frame 22 and the connection point of the connecting frame 24. A total of four wheels 21 are provided on the bottom surface side of the rear end of the lower frame 22 and the lower end of the leg portion 23. Since the lower frame 22 has a substantially U-shape, as shown in FIG. 1B, the lower frame 22 of the other transport cart 1B is added to the lower frame 22 of the transport cart 1A when stored in tandem. Enters and eventually engages.

  The jump bar (upward portion) 27 includes a rod portion 27A and a restriction portion 27B that is continuously provided so as to be bent forward from both left and right ends of the rod portion 27A. The jump bar 27 is an intermediate portion of the rod portion 27 </ b> A and is connected between the upper end of the leg portion 23 and the connection point of the connecting frame 24. The jumping bar 27 is a member that cooperates with a jumping guide 37 described later and has a function of simplifying the vertical storage of the transport cart 1. The function of the jump bar 27 will be described later.

  The movable portion 3 includes the above-described upper load carrier surface portion 31 and lower load carrier surface portion 33, a jumping guide 37 provided continuously with the link portion 35, and a retracting guide 38 provided continuously with the lower load carrier surface portion 33. Yes. The base end sides of the upper and lower loading platform surface portions 31 and 33 are pivotally supported with respect to the main body portion 2 via rotation axes R1 and R2 along the width direction, and the distal ends of the upper and lower loading platform surface portions 31 and 33 are respectively supported. The sides are connected to each other via a link part 35. The movable part 3 is movable with respect to the main body part 2 so that the upper stage carrier surface part 31 and the lower stage carrier surface part 33 rotate between a posture along the horizontal direction and a posture along the vertical direction.

  More specifically, the upper cargo bed surface portion 31 has a frame portion 31A whose outer shape is rectangular, and a rectangular base plate 31B arranged on the frame portion 31A. The base end (front end in the use state) of the frame portion 31 </ b> A is pivotally supported at the upper end of the leg portion 23. The base plate 31B is made of a synthetic resin, and is formed to be transparent, for example.

  The lower loading platform surface portion 33 includes a frame portion 33A whose outer shape is rectangular, and a rectangular base plate 33B disposed on the frame portion 33A. The base end (front end in the use state) of the frame portion 33 </ b> A is pivotally supported at the rear end of the protruding portion 25. The base plate 33B is made of synthetic resin, and is formed to be transparent, for example.

  The link portion 35 is composed of two rod-shaped frames, and one end (upper end in use state) of the link portion 35 is pivotally supported via a rotation shaft extending in the left-right direction with respect to the front end (rear end in use state) of the upper stage loading surface portion 31. In addition, the other end (lower end in use state) is pivotally supported via a rotation shaft extending in the left-right direction with respect to the tip end (rear end in use state) of the lower stage loading platform surface portion 33.

  Here, in the transport cart 1, as shown in FIG. 3 (a), the distance L1 from the rotation axis R1 of the upper stage cargo bed surface portion 31 to the connection point A of the link portion 35 is linked from the rotation axis R2 of the lower cargo bed surface portion 33 to the link. It is made longer than the distance L2 to the connection location B of the part 35.

  Returning to FIG. 1, the jumping guide 37 is composed of a single frame having a predetermined shape, and has a guide portion 37 </ b> A in a part thereof. The guide portion 37A extends from the rear to the front so as to be inclined downward with respect to the horizontal direction in the use state. As described above, the jump guide 37 is a member having a function of facilitating the storing operation of the transport carriage 1 in cooperation with the jump bar 27. The function of the jump guide 37 will be described later.

  In use, the pull-back guide 38 includes a base portion 38A continuously provided so as to extend downward with respect to the lower loading platform surface portion 33, and a bent portion 38B extended so as to be bent backward from the tip of the base portion 38A. It has a key shape. The pull-back guide 38 engages with the main body 2 (the jumping bar 27 in the present embodiment) of another transport carriage that is located rearward in the stored state. The function of the pull back guide 38 will be described later.

  Next, the use state and the storage state will be described with reference to FIGS. In FIG. 2, some members are omitted, and in FIG. 2B and FIG. 2C, the movable part in the use state is indicated by a broken line. In the state of use, the lower load carrier surface portion 33 is supported by the lower frame 22, whereby the upper load carrier surface portion 31, the lower load carrier surface portion 33, and eventually the movable portion 3 are held (see FIGS. 2 (a) and 3 (a)). ). On the other hand, in the storage state, the movable portion 3 is moved so that the upper load carrier surface portion 31 and the lower load carrier surface portion 33 rotate upward from the use state (FIGS. 2B, 3B, and 3C). )), The front end side of the lower load carrier surface portion 33 falls forward and comes into contact with the upper load carrier surface portion 31, and the upper load carrier surface portion 31 is supported by the lower load carrier surface portion 33 (see FIG. 2C and FIG. 3D). . That is, in the stowed state, the lower load carrier surface portion 33 falls forward beyond a right angle, the upper load carrier surface portion 31 is supported by the weight of the lower load carrier surface portion 33, and the movable portion 3 is locked.

  Here, when the use state is changed to the storage state, as shown in FIG. 3C, the connection point A between the upper load carrier surface portion 31 and the link portion 35 and the connection portion C between the lower load carrier surface portion 33 and the protruding portion 25. When the lower loading platform surface portion 33 is located behind the line segment S connecting (rotating axis R1), when no external force is applied to the lower loading platform surface portion 33, the lower loading platform surface portion 33 falls backward due to its own weight. Rotate to. On the other hand, as shown in FIG. 3 (d), when the lower load carrier surface portion 33 rotates to the front side of the line segment S, the lower load carrier surface portion 33 rotates so as to fall forward due to its own weight. Therefore, if the movable part 3 is rotated to a position where the lower stage cargo bed surface part 33 exceeds the line segment S, the lower stage cargo bed surface part 33 naturally (automatically) rotates toward the upper stage cargo bed surface part 31 by its own weight. The movable part 3 is locked in contact with 31.

  When the storage state is changed to the use state, the reverse process is performed. That is, the movable part 3 is moved so that the lower stage carrier surface part 33 rotates downward from the storage state, and the upper stage carrier surface part 31 and the lower stage carrier surface part 33 rotate to a position along the horizontal direction. At this time, if the movable part 3 is rotated to a position where the lower stage cargo bed surface part 33 exceeds the line segment S, the lower stage cargo bed surface part 33 is naturally rotated downward by its own weight, and is in a use state (normal carriage form).

  Next, with reference to FIG. 4 to FIG. 7, a process of newly storing a transport cart at the end of the transport cart stored in series and a process of taking out the transport cart stored at the end will be described. FIG. 4 shows a process of newly storing the transport cart 1A at the tail end of the transport carts 1B to 1D stored in tandem. As described above, the last transport cart 1B is housed in use. FIG. 6 shows a process of taking out the transport cart 1A stored at the end.

  First, with reference to FIG.4 and FIG.5, the process in which the conveyance trolley 1A is newly accommodated at the tail is demonstrated. In this case, it is only necessary to bring the transport cart 1A closer to the transport cart 1B stored at the end. That is, the jump guide 37 of the transport cart 1B is pushed up by the jump bar 27 of the transport cart 1A so that the upper load platform surface portion 31 and the lower load platform surface portion 33 rotate upward when the transport cart 1A approaches (or ) Specifically, the rod portion 27A comes into contact with the guide portion 37A due to the approach of the transport carriage 1A, and the guide portion 37A is pushed up by the rod portion 27A. As a result, the transport cart 1B is in the housed state. In addition, by providing the restricting portion 27B, it is possible to prevent the right and left positions of the transport carriages 1A and 1B from being shifted in the middle of the push-up, and the engagement between the jumping bar 27 and the jumping guide 37 is removed. Is done.

  At this time, as shown in FIG. 5, the pull-back guide 38 of the transport carriage 1B is engaged with the jumping bar 27 of the transport carriage 1A. Specifically, when the movable portion 3 is moved so that the upper load carrier surface portion 31 and the lower load carrier surface portion 33 of the transport cart 1B rotate upward, and the storage portion is brought into the folded state, the bent portion 38B of the rod portion 27A of the transport cart 1A is provided. It will be in the state where it entered back.

  From this state, when the transport cart 1A stored at the end is separated (pulled back), as shown in FIGS. 6 and 7, the pull-back guide 38 of the transport cart 1B has the upper load platform surface portion 31 and the lower load platform surface portion 33. Is pulled by the jumping bar 27 of the transport carriage 1A so as to rotate downward. Specifically, the retracting guide 38 is pulled by the bent portion 38B coming into contact with the rod portion 27A and being pushed backward. As a result, the transport cart 1B is in use. Thus, as long as the transport cart 1A stored at the end is pulled back, the front transport cart 1B to which the transport cart 1A is connected is changed from the stored state to the use state.

  Next, the brake structure of the transport cart 1 will be described with reference to FIGS. In FIG. 8 to FIG. 10, members related to the brake structure of the transport carriage 1 are highlighted. The transport carriage 1 further includes a brake mechanism 41 and a handle portion 47 connected to the brake mechanism 41 via a brake link portion 45 in addition to the main body portion 2 and the movable portion 3 described above. The handle portion 47 is pivotally supported via a rotation shaft extending in the left-right direction with respect to a continuous portion 31 </ b> D provided continuously to the upper loading platform surface portion 31.

  The brake mechanism 41 includes a fixed portion 42 fixed to the leg portion 23, a spring portion 43 connected to the fixed portion 42 and the brake link portion 45, a brake shoe 44 disposed on an end portion of the brake link portion 45, The movement of the main body 2 is restricted by pressing the brake shoe 44 against the floor with the tensile force of the spring 43. The brake mechanism 41 is in an activated state at the normal time shown in FIG. 8 and restricts the movement of the main body 2. In other words, the brake mechanism 41 is in a normal brake state in which the brake state is normally set. On the other hand, as shown in FIG. 9, when the brake shoe 44 is pulled up by an action described later, the brake shoe 44 is brought into a non-operating state and the restriction on the movement of the main body 2 is released.

  As shown in FIGS. 9 and 10, the brake link unit 45 includes four links, that is, a first link 45A, a second link 45B, a third link 45C, and a fourth link 45D. The first link 45A to the fourth link 45D are pivotally supported with respect to adjacent links via a rotation axis along the left-right direction. The end portion of the first link 45A that is not connected to the second link 45B is pivotally supported with respect to the handle portion 47 via a rotation shaft extending in the left-right direction. The end portion of the fourth link 45D that is not connected to the third link 45C is connected to the spring portion 43 and the brake shoe 44 as described above.

  Here, the second link 45B and the third link 45C are pivotally supported on the connecting frame 24 (in other words, the main body 2). Further, the handle portion 47 is pivotally supported by a continuous portion 31 </ b> D that is continuous with the upper loading platform surface portion 31. Accordingly, the connection point P2 between the handle portion 47 and the first link 45A, the connection point P3 between the first link 45A and the second link 45B, and the connection point P5 between the third link 45C and the fourth link 45D are shown in FIG. 10 and FIG. 10, the connecting part P1 between the connecting part 31D and the handle part 47 and the connecting part P4 between the second link 45B and the third link 45C are movable axes on the plane shown in FIG. It is a fixed axis. In FIGS. 9 and 10, the movement axis is indicated by a white circle and the fixed axis is indicated by a black circle.

  As a result, as shown in FIG. 9, when the operator pushes down the handle portion 47 in the use state, the fourth link 45D is pulled up, the brake shoe 44 is pulled up, and the brake mechanism 41 is deactivated. That is, the brake link portion 45 controls the movement of the main body portion 2 by operating the brake mechanism 41 when no external force is applied to the handle portion 47, and brakes when the external force is applied to the handle portion 47. The mechanism 41 is deactivated to restrict the movement of the main body 2. Accordingly, the brake mechanism 41 is in an activated state at normal time, while the handle portion 47 is pushed down and deactivated while the operator moves the transport cart 1. In addition, in FIG.9 (b), each part before a movement is shown with the broken line.

  Furthermore, as shown in FIG. 10, when the movable portion 3 is moved so that the upper loading platform surface portion 31 and the lower loading platform surface portion 33 rotate upward as shown in FIG. It rotates as a fulcrum and jumps upward together with the movable part 3. After the jump, no external force is applied to the handle portion 47 (because the handle portion 47 is unloaded), the brake mechanism 41 is activated and the movement of the main body portion 2 is restricted. That is, the brake is applied even in the retracted state, and the normal brake state is maintained. In addition, in FIG.10 (b), each part before a movement is shown with the broken line.

  As described above, in the present embodiment, when the tandem storage is performed so as to overlap each other in the front-rear direction, as long as the movable part 3 is moved so that the upper stage carrier surface part 31 and the lower stage carrier surface part 33 rotate upward from the use state, the lower stage carrier surface part The tip end side of 33 falls forward and comes into contact with the upper load carrier surface portion 31, the upper load carrier surface portion 31 is supported by the weight of the lower load carrier surface portion 33, and the movable portion 3 is locked. For this reason, it is not necessary to attach and detach a member or to store each member by rotating them separately as in the prior art. Therefore, it can be easily stored in tandem.

  Further, in the present embodiment, when another transport cart 1A located rearward approaches the transport cart 1B, the other transport cart 1A so that the upper load platform surface portion 31 and the lower load platform surface portion 33 rotate upward. A jumping guide 37 that is pushed up by a jumping bar (upper part) 27 is provided. As a result, as shown in FIG. 4, as long as another transport carriage 1 </ b> A is approached from the rear, the transport carriage 1 </ b> B stored at the end is changed from the use state to the storage state. Therefore, it can be more easily stored in tandem.

  Further, in the present embodiment, when another transport cart 1A located behind is separated, the jumping bar 27 of the other transport cart 1A so that the upper load platform surface portion 31 and the lower load platform surface portion 33 rotate downward. The pull back guide 38 of the transport carriage 1B is pulled by the (main body part 2). Accordingly, as shown in FIG. 6, as long as the transport cart 1A stored at the end is pulled back, the front transport cart 1B is changed from the stored state to the use state. Therefore, it is possible to always arrange the transport cart 1B in use at the end.

  Further, the transport cart 1B of the present embodiment has another transport cart 1A approaching from the rear, the movable part 3 is moved and moved from the use state to the storage state, and at the same time, the pull back guide 38 is connected to the other transport cart 1A. The state is engaged with the jump bar 27. Thereby, for example, the operation of engaging the pullback guide 38 separately from the jumping of the movable portion 3 is unnecessary, and the pulling of the jumping bar 27 by the pullback guide 38 can be suitably realized.

  In the present embodiment, as described above, in the retracted state, no external force is applied to the handle portion 47, the brake mechanism 41 is activated, and the movement of the main body portion 2 is restricted. As a result, the brake is applied even in the storage state (the automatic brake at the time of work other than the movement of the transport carriage 1 is maintained even in the case of parallel storage), compared with the case where the brake is not applied horizontally on the road surface. In addition, it is possible to prevent the transport cart 1 from unintentionally moving during storage, and to improve convenience and safety. Further, since the brake is automatically applied in the housed state, the work can be simplified as compared with, for example, a case where the brake structure is different (other than automatic). In addition, when carrying parts etc., if only the handle | steering-wheel part 47 is pushed down, the conveyance trolley | bogie 1 can be moved by making the brake mechanism 41 into a non-operation state.

  By the way, it has been conventionally known that when carrying carts having two stages of loading platform surfaces in cascade so as to overlap each other, the loading platform surface has a trapezoidal shape and is inclined with respect to the horizontal direction. If this is done, there is a risk that the mounted component will move. On the other hand, according to the present embodiment, the upper load carrier surface portion 31 and the lower load carrier surface portion 33 have a rectangular shape, and can be stored in tandem while maintaining the horizontal state during use.

  Further, in the present embodiment, in the housed state, the upper stage carrier surface part 31 is supported by the weight of the lower stage carrier surface part 33 and the movable part 3 is locked, and the transport carriage 1B alone supports its own load. Therefore, no load is applied to the other transport cart 1A located on the rear side when stored in a column.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above-described embodiments. The present invention can be modified without departing from the scope described in the claims or applied to other embodiments. May be.

  For example, in the above-described embodiment, an example in which the present invention is applied to a truck for carrying parts in a factory has been described. However, the carriage of the present invention can carry goods, etc. in a supermarket, carry baggage, etc. in an airport, etc. It can be applied to a cart for various transport operations.

  Moreover, in the said embodiment, although 1 A of conveyance carts located in the back approached or separated, it demonstrated that the state of the conveyance cart 1B was changed between a use state and an accommodation state, but an operator is another The movable part 3 may be moved by means (for example, by pushing it up manually) to change the state of the transport carriage 1B.

  Further, in the above-described embodiment, it has been described that the pullback guide 38 is engaged with the jumping bar 27. However, the pullback guide 38 only needs to be engaged with the main body portion 2, and the portion other than the jumping bar 27 may be engaged. You may engage. However, if the portion to be engaged is the jump bar 27, it is not necessary to separately provide a member for engaging the pull back guide 38, so that the structure can be simplified.

  In the above embodiment, the brake mechanism 41 is described as restricting the movement of the main body 2 by pressing the brake shoe 44 against the floor. However, the structure of the brake mechanism 41 is not limited to this. For example, a type in which the brake shoe is pressed against the wheel 21 may be used.

  Incidentally, the material of each member is not particularly limited, and may be made of, for example, a metal, or may be a structure in which a synthetic resin or wood is used for a part or all thereof. Further, the shape of each member is not particularly limited, and for example, the shapes of the base plates 31B and 33B of the upper load carrier surface portion 31 and the lower load carrier surface portion 33 may be a lattice shape or the like.

  DESCRIPTION OF SYMBOLS 1,1A-1D ... Carriage trolley, 2 ... Main-body part, 3 ... Movable part, 21 ... Wheel, 22 ... Lower frame, 23 ... Leg part, 23 ... Leg part, 25 ... Projection part, 27 ... Jumping bar (jumping bar) (Upper part), 31 ... upper loading platform surface portion, 33 ... lower loading platform surface portion, 35 ... link portion, 37 ... lifting guide, 38 ... retraction guide, 41 ... brake mechanism, 45 ... brake link portion, 47 ... handle portion, R1 ... Rotating shaft, R2 ... Rotating shaft.

Claims (4)

It is a transport cart that can be stored in tandem so as to overlap each other in the front and back,
A main body having wheels;
A movable part that has an upper cargo bed surface part and a lower cargo bed surface part, and is movable relative to the main body part;
The base end sides of the upper stage loading platform surface portion and the lower stage loading platform surface portion are each pivotally supported via a rotation axis along the width direction with respect to the main body portion,
The top side of the upper stage cargo bed surface part and the lower stage cargo bed surface part are connected to each other via a link part,
The distance from the rotation axis in the upper stage load surface part to the connection part of the link part is longer than the distance from the rotation axis in the lower stage load part surface part to the connection part of the link part,
In the state of use, the upper stage cargo bed surface part and the lower stage cargo bed surface part extend along the horizontal direction,
In the stowed state, the movable portion is moved so that the upper load carrier surface portion and the lower load carrier surface portion rotate upward from the use state, so that the front end side of the lower load carrier surface portion falls forward to the upper load carrier surface portion. A transport cart that is in contact with and is supported by the lower load carrier surface portion. The main body further includes a jumping portion,
The movable part further includes a jumping guide,
The jumping guide is pushed up at the jumping upper part of the other transport cart so that the upper load platform surface portion and the lower load platform surface portion rotate upward when another transport cart located rearward approaches. The transport cart according to claim 1. The movable portion further includes a pull back guide that engages with the main body portion of another transport carriage that is located rearward in the stored state.
The pull-back guide is pulled by the main body of the other transport cart so that the upper load platform surface portion and the lower load platform surface portion rotate downward when the other transport cart is separated. The transport cart according to claim 1 or 2. A brake mechanism for restricting movement of the main body,
A handle portion provided on the movable portion and connected to the brake mechanism via a brake link portion;
The brake link unit operates the brake mechanism in an operating state when an external force is not applied to the handle unit and restricts the movement of the main body unit, and the brake mechanism when an external force is applied to the handle unit. To cancel the restriction of movement of the main body,
The external force is not applied to the handle part in the storage state, the brake mechanism is in an activated state, and the movement of the main body part is restricted. Carriage cart as described in the paragraph.