JP6578147B2 - Transport cart - Google Patents

Description

  The present invention relates to a transport cart configured to connect a transport cart to another transport cart and to release the connection.

  Two carts are connected to the transport cart that carries the load, thereby increasing the amount of load that one worker carries at a time and reducing the number of times required to carry the load. Technology is known. The transport cart described in Patent Literature 1 includes an upper connecting portion protruding forward at the front end of the cargo bed, and includes a lower connecting portion at the rear end of the cargo bed. The upper connecting portion includes a protruding portion protruding downward, and the lower connecting portion is configured to be able to fit with the protruding portion below the upper connecting portion provided in another cart. Opening is formed. And the upper connection part in one conveyance cart and the lower connection part in the other conveyance vehicle are fitted together, so that the end of the loading platform in one carriage and the end of the loading platform in the other carriage are connected. To do.

JP 2014-184801 A

  By the way, in the scene where the transport cart described above is used, for example, two transport carts are connected, and a large number of beverage cases are placed on each transport cart. Then, the transport cart in such a state is lifted by a forklift claw, and is quickly moved in a distribution warehouse, or is loaded on a truck after the movement. At this time, if the two transport carts are lifted by a forklift claw or moved by a forklift, vibrations from the forklift traveling on the road surface with a step are transmitted to each transport cart, and as a result, each transport cart is There is a possibility that the connection between the two transport carts is released due to the transmitted vibration.

  An object of the present invention is to provide a carriage that can suppress the connection between two carriages from being released by vibrations transmitted to each carriage.

  A transport cart for solving the above problems is a transport cart that constitutes a plurality of transport carts each of which can be connected to other transport carts, and a guide surface positioned below the load platform surface. A guide rail that has a guide end extending from the lead-in end to the lead-out end along a connecting direction along the load carrier surface, and has a guide rail extending from the lead-in end to the lead-out end, and below the load carrier surface. A connecting member located at a position where the movement of the connecting member along the connecting direction between the standby position and the connecting position is guided by the guide rail. A connecting portion provided with the protruding portion by movement from the standby position to the connecting position, including a portion located below the surface and a protruding portion that is a portion protruding in the connecting direction from the loading platform surface; The Obtain. The projecting portion of the connecting member at the connecting position is an introduction target, and the introduction target is configured to be able to guide from an introduction end to a guide rail of another transport carriage, and the guide rail includes the guide rail. And a restricting portion for restricting displacement of the introduction target and the connecting member in the vertical direction.

  According to the above configuration, in one of the two transport carts, the displacement of the connecting member in the vertical direction is suppressed by the guide rail of the one transport cart, and the displacement of the protruding portion in the vertical direction is the other transport cart. It is suppressed by the guide rail which has. Therefore, it is possible to suppress the connection between the two carriages from being released by the vibration transmitted to each carriage.

  In the transport cart, a direction perpendicular to the connection direction on the cargo bed surface is a fork insertion direction, and the transport cart is connected to the connection mechanism including the connection member and the guide rail, and is located on the introduction end side. A pair of casters composed of a pair of casters, a pair of casters composed of the other caster located on the lead-out end side, the cargo bed surface, and projecting downward from the cargo bed surface and extending in the connecting direction. A loading platform including ribs. The transport carriage extends in the fork insertion direction and two first regions arranged in the connection direction, and the second region extends in the fork insertion direction and is sandwiched between the first regions. The two first regions may be divided and include the casters separately for each of the first regions, and the lower end of the coupling mechanism may be located above the lower end of the rib in the second region.

  The lower part of the second region in the transport cart is a gap into which the forklift claw is inserted in the gap between the cargo bed and the ground contact surface of the caster. According to the transport cart, the lower end of the coupling mechanism is located above the lower end of the rib in the second region. Therefore, when the transport cart is lifted by the forklift pawl, the forklift pawl hits the rib before hitting the coupling mechanism. As a result, the deformation of the coupling mechanism due to the contact between the pawl of the forklift and the coupling mechanism is suppressed.

  The transport cart includes a first holding mechanism that holds the connecting member at the connecting position, and a second holding mechanism that holds the protruding portion introduced into the guide rail on the guide rail. Here, the force applied to the projecting portion of the transport cart from the other transport cart in the direction opposite to the connecting direction, and the force required to release the holding by the first holding mechanism is a release force. It is. Moreover, it is the force applied toward the said connection direction from the said protrusion part of a conveyance trolley with respect to the 2nd holding mechanism of another conveyance trolley, Comprising: It requires for the start of the holding | maintenance by the 2nd holding mechanism of another conveyance trolley The force is the operating force. The release force may be greater than the operating force.

  In the transport cart, when the projecting portion of the transport cart is guided by the guide rail of another transport cart, the projecting portion of the transport cart is in a direction opposite to the connecting direction through contact with the guide rail of the other transport cart. It becomes easier to receive stress from other transport carts. In this regard, as described above, if the release force is greater than the actuation force, the position of the connecting member in the transport carriage is maintained at the connection position based on the large release force, and the protruding portion of the transport carriage is Based on the fact that the operating force is small, it is held by another transport cart. As a result, it is possible to smoothly connect the two transport carts and to increase the holding force of the two transport carts in a connected state.

  According to the present invention, it is possible to suppress the connection between the two transport carts from being released by the vibration transmitted to each transport cart.

It is a perspective view which shows the perspective structure of the conveyance trolley which looked at the conveyance trolley from the loading platform surface side. It is a perspective view which shows the disassembled perspective structure of the conveyance trolley which looked at the conveyance trolley from the back surface part side. It is sectional drawing which shows the plane cross-section of the connection mechanism with which a conveyance trolley is provided. It is an operation | movement figure which shows the effect | action of the connection mechanism with which a conveyance trolley is equipped, Comprising: (a) It is a figure which shows the state which a guide plate starts moving from a standby position, (b) Between a standby position and a connection position, a guide plate is a figure. It is a figure which shows the state located. It is an operation | movement figure which shows the effect | action of the connection mechanism with which a conveyance trolley is provided, Comprising: It is a figure which shows the state which a guide plate is located in a connection position. It is an operation view of a transport cart showing a process of connecting two transport carts, (a) an operation diagram showing a state where a guide plate is in contact with a fitting plate of another transport cart, and (b) a guide plate. It is an effect | action figure which shows the state which is pushing down the fitting plate of another conveyance trolley. It is an effect | action figure of the conveyance trolley which shows the process in which two conveyance trolleys are connected, Comprising: It is an effect | action figure which shows the state by which the fitting plate of the other conveyance trolley was let through the notch part of a guide plate. It is sectional drawing which shows the side cross-section structure of the conveyance trolley in the state which two conveyance trolleys connected.

Hereinafter, one embodiment of a transport cart will be described with reference to the drawings.
As shown in FIG. 1, the loading platform 11 included in the transport cart has a rectangular plate shape extending in one direction. The longitudinal direction of the loading platform 11 is the connecting direction DG, and the short direction of the loading platform 11 is the fork insertion direction DF. Separate casters 12 are fixed to the four corners of the back surface portion 11B of the loading platform 11 for each corner. Of the four casters 12, the pair of casters 12 arranged in the fork insertion direction DF constitutes one caster set 12P, and the four casters 12 are constituted by two caster sets 12P arranged in the connecting direction DG.

  The surface on which the luggage is placed in the loading platform 11 is a loading platform surface 11S. Caster accommodating portions 11G, which are depressions toward the back surface portion 11B of the loading platform 11, are separately formed at the four corners of the loading platform surface 11S. Each caster accommodating portion 11G has a size capable of accommodating a part of the wheel 12W of the caster 12. When another transport cart is placed on the loading platform surface 11S of the transport cart, the wheels 12W of the casters 12 included in the other transport carts are arranged inside each caster housing portion 11G. And the wheel 12W of the caster 12 which other transport carts have is permitted to move only inside the caster accommodating portion 11G, and thereby the other transport carts are restricted from moving on the transport cart.

  The peripheral wall of the loading platform 11 has a rectangular frame shape, and is composed of two side wall portions 11W facing each other in the connection direction DG and two end wall portions 11E facing each other in the fork insertion direction DF. . Each side wall part 11W is an example of a rib protruding downward from the loading platform surface 11S, and has a rectangular plate shape extending in the connecting direction DG. In addition, the side wall part 11W may be comprised from one rib, and may be comprised from the some rib lined up along the connection direction DG.

  As shown in FIG. 2, a mechanism housing portion 11 </ b> R is formed on the back surface portion 11 </ b> B of the loading platform 11. The mechanism accommodating portion 11R is a recess extending from the back surface portion 11B toward the loading platform surface 11S, and is a groove extending in the connecting direction DG. The back surface portion 11B includes a plurality of ribs protruding downward from the cargo bed surface 11S. Among the plurality of ribs, a pair of partition ribs 11L extending over the entire back surface portion 11B in the connecting direction DG is included. The mechanism accommodating portion 11R is a space sandwiched between the pair of partition ribs 11L.

  Of the two end wall portions 11E of the loading platform 11, one end wall portion 11E is the introduction end wall portion 11E2, and the other end wall portion 11E located in the connecting direction DG is the lead-out end wall portion 11E1. . Each of the lead-out end wall portion 11E1 and the introduction end wall portion 11E2 is formed with an opening portion 11P that is a groove opening included in the mechanism housing portion 11R. The edge portion 11F that partitions the opening portion 11P in the end wall portion 11E has a shape that widens the opening width from the inside of the loading platform 11 toward the outside of the loading platform 11. And when another member advances toward the opening part 11P from the exterior of the loading platform 11, each edge part 11F guides another member to the inside of the mechanism accommodating part 11R.

  The coupling mechanism 20 is accommodated in the mechanism accommodating portion 11R. The coupling mechanism 20 includes a guide rail 21 fixed to the mechanism housing portion 11R and a coupling plate 22 that is an example of a coupling member accommodated in the guide rail 21. The coupling mechanism 20 is an example of a first fitting plate 23 that is an example of a first fitting portion positioned inside the guide rail 21 and a first holding mechanism that is fixed inside the guide rail 21. A first holding mechanism 24 is provided. Further, the coupling mechanism 20 is a second fitting plate 25 that is an example of a second fitting piece positioned inside the guide rail 21, and a second that is an example of a second holding mechanism that is fixed inside the guide rail 21. A holding mechanism 26 and a release shaft 27 which is an example of an operation unit are provided.

  The guide rail 21 has a plate shape extending in the connection direction DG, and has a length substantially equal to that of the loading platform 11 in the connection direction DG. The end face shape of the guide rail 21 is a rectangular shape extending in the fork insertion direction DF as viewed from the connection direction DG, and a part of the lower side of the rectangle is cut out. The guide rail 21 has a shape in which an end surface shape viewed from the connection direction DG is continuous in the connection direction DG.

  Of the two ends of the guide rail 21 in the connection direction DG, one end is the introduction end 21E2, and the other end located in the connection direction DG is the lead-out end 21E1. The introduction end 21E2 of the guide rail 21 is disposed in the opening 11P formed in the introduction end wall portion 11E2 of the loading platform 11, and the leading end 21E1 of the guide rail 21 is an opening formed in the leading end wall portion 11E1 of the loading platform 11. Arranged in the part 11P.

  The guide rail 21 includes one guide upper wall portion 21T that constitutes the restricting portion, two guide side wall portions 21S that define the guide path, and two guide lower wall portions 21B that constitute the restricting portion. The guide upper wall portion 21 </ b> T forms a top side in the end face shape of the guide rail 21 and has a band shape extending in the connection direction DG. Each guide side wall 21S constitutes a side in the end face shape of the guide rail 21, and faces the other guide side wall 21S in the fork insertion direction DF. Each guide lower wall portion 21B constitutes a lower side in the end face shape of the guide rail 21, and faces the guide upper wall portion 21T. Separate guide side wall portions 21S are bent downward from two side ends of the guide upper wall portion 21T. Separate guide lower wall portions 21B are bent along the fork insertion direction DF from the lower end of each guide side wall portion 21S. The distance between the guide upper wall portion 21T and each guide lower wall portion 21B is a guide width 21W, and the guide width 21W is substantially constant along the connecting direction DG.

  Of the two guide side wall portions 21S, one guide side wall portion 21S has two insertion holes 21H that are rectangular holes penetrating the guide side wall portion 21S in the fork insertion direction DF, and the guide side wall portion 21S in the fork insertion direction. A release operation hole 21K which is one circular hole penetrating the DF is formed. Of the two insertion holes 21H, the insertion hole 21H close to the lead-out end 21E1 is a first claw support hole 21H1. Of the two insertion holes 21H, the insertion hole 21H close to the introduction end 21E2 is a second claw support hole 21H2.

  The first claw support hole 21H1 is positioned closer to the lead-out end 21E1 than the center of the guide rail 21 in the connection direction DG, and the second claw support hole 21H2 is closer to the introduction end 21E2 than the center of the guide rail 21 in the connection direction DG. Is located. The release operation hole 21K is located between the first claw support hole 21H1 and the second claw support hole 21H2, and the second claw support hole rather than the center between the first claw support hole 21H1 and the second claw support hole 21H2. It is located on the 21H2 side.

  The connection plate 22 has a plate shape that extends in the connection direction DG, and has approximately half the length of the guide rail 21 in the connection direction DG. The end face shape of the connection plate 22 is a rectangular shape extending in the fork insertion direction DF as viewed from the connection direction DG, and is a shape in which a part of the upper side of the rectangle is cut away. The connection plate 22 has a shape in which an end surface shape viewed from the connection direction DG is continuous with the connection direction DG. Of the two ends of the connection plate 22 in the connection direction DG, one end is the standby end 22E2, and the other end located in the connection direction DG is the connection end 22E1. The connection end 22E1 is an open end that opens the inside of the connection plate 22 in the connection direction DG.

  The vertical width of the connecting plate 22 is a sliding width 22W, and the sliding width 22W is substantially constant along the connecting direction DG. The sliding width 22W of the connecting plate 22 is slightly smaller than the guide width 21W of the guide rail 21. The width of the connecting plate 22 in the fork insertion direction DF is slightly smaller than the distance between the pair of guide side wall portions 21S in the guide rail 21 and is also substantially constant along the connecting direction DG.

  The connection plate 22 having such a structure is slid in the connection direction DG with respect to the guide rail 21 in a state where the connection plate 22 is sandwiched between the upper guide wall 21T and the lower guide wall 21B. Allow to move. Further, the connecting plate 22 is allowed to slide in the connecting direction DG with respect to the guide rail 21 in a state where the connecting plate 22 is sandwiched between the pair of guide side wall portions 21 </ b> S in the guide rail 21. In other words, the guide rail 21 defines a guide path extending in the connection direction DG and is configured to be able to slide the connection plate 22 accommodated in the guide direction DG so that the connection plate 22 slides. As a whole, the vertical direction of the connecting plate 22 is supported.

  The connection plate 22 has a plate operation portion 22P that protrudes downward from the connection plate 22. The plate operation part 22P has a plate shape in which a part of the bottom wall of the connecting plate 22 is bent downward. The length of the plate operation part 22P in the fork insertion direction DF is shorter than the distance between the pair of guide lower wall parts 21B. That is, the plate operation part 22P is configured so that the plate operation part 22P can translate between the pair of guide lower wall parts 21B in a state where the connecting plate 22 is accommodated in the guide rail 21.

  The operation of pulling out the plate operation unit 22P from the lower side of the loading platform 11 and the operation of pushing back the plate operation unit 22P to the lower side of the loading platform 11 can be performed manually by a crooked person. Can also be done. The operation of pulling out the plate operation unit 22P from the lower side of the loading platform 11 and the operation of pushing back the plate operation unit 22P to the lower side of the loading platform 11 are operations for translating the connection plate 22 in the connection direction DG. It is also possible to use a hole adjacent to the plate operation unit 22P.

  The connection plate 22 includes an operation wall portion 22S that is a side wall portion extending in the connection direction DG. The operating wall portion 22S faces the guide side wall portion 21S in which the first claw support hole 21H1 and the second claw support hole 21H2 are formed in a state where the connecting plate 22 is accommodated in the guide rail 21. The operation wall 22S is formed with two notches 22H that are rectangular holes that penetrate the operation wall 22S in the fork insertion direction DF. Of the two notches 22H, one notch 22H is a connecting notch 22H2 that is an example of a first fitted portion, and the other notch 22H located in the connecting direction DG is: It is the notch part 22H1 for standby which is an example of a 2nd to-be-fitted part. The standby notch 22H1 and the connection notch 22H2 have substantially the same size as the insertion hole 21H.

  In the first fitting plate 23, the fitting claws of the first fitting plate 23 pass through the first claw support holes 21 </ b> H <b> 1 and the standby notch 22 </ b> H <b> 1, whereby the position of the connecting plate 22 is changed to the guide rail 21. It has the function to hold it. Further, the first fitting plate 23 has the fitting claw of the first fitting plate 23 through the first claw support hole 21H1 and the connection notch 22H2, thereby the position of the connection plate 22 is guided to the guide rail. 21 has a holding function.

  The first fitting plate 23 is a plate member formed by bending. The 1st fitting plate 23 is provided with the 1st fitting claw 23A which is an example of the 1st fitting part, and the 1st fitting claw 23A has the shape of a belt extended in the fork insertion direction DF. The first fitting plate 23 includes a first biased portion 23B having a plate shape protruding upward.

  The first fitting plate 23 is accommodated in the guide rail 21 and is disposed between the guide upper wall portion 21 </ b> T and the bottom wall of the connecting plate 22. The length of the first fitting plate 23 in the fork insertion direction DF is shorter than the length of the connection plate 22 and allows the connection plate 22 to move in the connection direction DG. The first fitting claw 23A has a size that allows each of the first claw support hole 21H1, the standby cutout portion 22H1, and the connection cutout portion 22H2 to be inserted in the fork insertion direction DF.

  The first holding mechanism 24 has a function of constantly urging the first fitting claw 23A of the first fitting plate 23 toward the first claw support hole 21H1. The first holding mechanism 24 includes, for example, a first clamping piece 24A and a first coil spring 24SP that is an example of a first urging portion. 24 A of 1st clamping pieces are the board members formed by bending which have an inverted U shape seeing from the connection direction DG.

  24 A of 1st clamping pieces are fixed to the guide upper wall part 21T with which the guide rail 21 is provided. The first clamping piece 24A projects a pair of clamping parts 24AP facing each other in the fork insertion direction DF downward. The first fitting plate 23 and the first coil spring 24SP are sandwiched between the pair of clamping portions 24AP.

  The first clamping piece 24A is fixed to the guide rail 21 so that the first fitting claw 23A and the first claw support hole 21H1 face each other in the fork insertion direction DF. The first coil spring 24SP constantly urges the first fitting claw 23A toward the first claw support hole 21H1, and allows the first fitting claw 23A to move only along the fork insertion direction DF.

  As for the 2nd fitting plate 25, the fitting nail which the 2nd fitting plate 25 has passes through the 2nd nail support hole 21H2 and the notch part 22H1 for waiting of other conveyance vehicles, and, thereby, another conveyance cart The position of the connecting plate 22 is held with respect to the guide rail 21.

  Similar to the first fitting plate 23, the second fitting plate 25 is a plate member formed by bending. The second fitting plate 25 includes a second fitting claw 25A that is an example of a second fitting portion, and the second fitting claw 25A has a plate shape extending in the fork insertion direction DF. The second fitting plate 25 includes a second biased portion 25B having a plate shape protruding upward.

  The 2nd fitting plate 25 is accommodated in the inside of the guide rail 21, and has a magnitude | size which can be arrange | positioned between the bottom wall of the connection plate 22 of another conveyance trolley | bogie, and the guide upper wall part 21T. The length of the second fitting plate 25 in the fork insertion direction DF is shorter than the length of the connection plate 22 and allows the connection plates 22 of other transport carriages to move in the connection direction DG. The second fitting claw 25A has a size that allows each of the second claw support hole 21H2 and the standby notch 22H1 to be inserted in the fork insertion direction DF.

  The second holding mechanism 26 has a function of constantly urging the second fitting claw 25A of the second fitting plate 25 toward the second claw support hole 21H2. The second holding mechanism 26 includes, for example, a second clamping piece 26A and a second coil spring 26SP that is an example of a second urging portion. 26 A of 2nd clamping pieces are the plate members formed by bending which have an inverted U shape seeing from the connection direction DG.

  26 A of 2nd clamping pieces are fixed to the guide upper wall part 21T with which the guide rail 21 is provided. The second sandwiching piece 26A projects a pair of sandwiching portions 26AP facing each other in the fork insertion direction DF downward. The second fitting plate 25 and the second coil spring 26SP are sandwiched between the pair of sandwiching portions 26AP.

  The second clamping piece 26A is fixed to the guide rail 21 so that the second fitting claw 25A and the second claw support hole 21H2 face each other. The second coil spring 26SP constantly urges the second fitting claw 25A toward the second claw support hole 21H2 and allows the second fitting claw 25A to move only along the fork insertion direction DF.

  The release shaft 27 has a rod shape extending in the fork insertion direction DF. The release shaft 27 is passed through the release operation hole 21K in a state where the release shaft 27 can move forward and backward in the fork insertion direction DF. The release shaft 27 is disposed so that the tip thereof and the second fitting plate 25 abut.

  When the release shaft 27 receives an external force in the direction opposite to the fork insertion direction DF, the external force in the direction opposite to the fork insertion direction DF is transmitted to the second fitting plate 25 through the tip of the release shaft 27. That is, an external force in a direction opposite to the urging force applied by the second holding mechanism 26 is applied to the second fitting plate 25, whereby the second fitting plate 25 is displaced in a direction opposite to the fork insertion direction DF. .

  As shown in FIG. 3, the position where the first claw support hole 21H1 and the standby notch 22H1 substantially coincide with each other in the fork insertion direction DF among the possible positions of the connection plate 22 is the standby position of the connection plate 22. It is.

  Among the possible positions of the first fitting plate 23, the position where the tip of the first fitting claw 23A protrudes outside the first claw support hole 21H1 is the first fitting position of the first fitting plate 23. . Among the possible positions of the first fitting plate 23, the position where the tip of the first fitting claw 23 </ b> A can be slidably contacted with the inner surface of the operating wall portion 22 </ b> S is the first non-sticking position of the first fitting plate 23. It is a fitting position.

  When the connecting plate 22 is located at the standby position, the first fitting plate 23 is located at the first fitting position, and the first fitting claw 23A of the first fitting plate 23 is provided with the first claw support hole 21H1, And it fits with the notch 22H1 for standby. And the displacement of the connection plate 22 with respect to the guide rail 21 is suppressed.

  23 A of 1st fitting claws have the front-end | tip part which had the trapezoid shape seeing from the plane, and are provided with 1st derivation side slope 23A1 and 1st introduction side slope 23A2. The angle formed by the plane perpendicular to the fork insertion direction DF and the first derivation side inclined surface 23A1 is the return suppression angle α, and the return suppression angle α is smaller than 90 °. Further, the angle formed by the plane perpendicular to the fork insertion direction DF and the first introduction side inclined surface 23A2 is smaller than the return suppression angle α. In the connection plate 22 that moves along the connection direction DG, the working wall portion 22S of the connection plate 22 gets over the first lead-out side slope 23A1 and the first introduction-side slope 23A2.

  25 A of 2nd fitting claws have the front-end | tip part which has a right-angled trapezoid shape seeing from the plane, and are provided with 2nd derivation | leading-out side end surface 25A1 and 2nd introduction | transduction side slope 25A2. The angle formed by the plane perpendicular to the fork insertion direction DF and the second lead-out side end face 25A1 is approximately 90 °. The angle formed by the plane perpendicular to the fork insertion direction DF and the second introduction side inclined surface 25A2 is the introduction promotion angle β, and the introduction promotion angle β is smaller than the return suppression angle α. When the connection plate 22 of the other transport carriage is introduced into the guide rail 21 from the introduction end 21E2, the connection wall 22 of the connection plate 22 of the connection plate 22 of the other transport carriage is the second introduction. Get over the side slope 25A2.

  Among the possible positions of the second fitting plate 25, the position at which the tip of the second fitting claw 25A protrudes outside the second claw support hole 21H2 is the second fitting position of the second fitting plate 25. . Among the possible positions of the second fitting plate 25, the position where the tip of the second fitting claw 25 </ b> A can slidably contact the inner surface of the working wall portion 22 </ b> S is the second non-sticking position of the second fitting plate 25. It is a fitting position.

Next, the function of the connecting mechanism 20 will be described together with the process of connecting two transport carts.
As shown in FIG. 4A, when the plate operating portion 22P of the connection plate 22 is pulled in the connection direction DG from the state where the connection plate 22 is located at the standby position, the connection plate 22 is connected inside the guide rail 21. Begins sliding in direction DG.

  When the connecting plate 22 slides in the connecting direction DG, the tip of the working wall portion 22S constituting the connecting end 22E1 comes into contact with the first introduction side inclined surface 23A2 of the first fitting plate 23. Part of the external force that pulls the connecting plate 22 in the connecting direction DG displaces the first fitting plate 23 in a direction opposite to the fork insertion direction DF through contact between the working wall portion 22S and the first introduction side inclined surface 23A2. Converted into force.

  As a result, the first fitting plate 23 starts to be displaced from the first fitting position toward the first non-fitting position, the tip of the first fitting claw 23A comes out of the first claw support hole 21H1, and then The leading end of the first fitting claw 23A comes off from the standby cutout 22H1, and accordingly, the connecting plate 22 moves in the connecting direction DG.

  As shown in FIG. 4B, when the plate operating portion 22P of the connecting plate 22 is further pulled in the connecting direction DG while the first fitting plate 23 is located at the first non-fitting position, the first fitting is performed. The front end of the joint claw 23A is in sliding contact with the inner side surface of the working wall portion 22S, and the outer side surface of the working wall portion 22S slides on the inner side surface of the guide side wall portion 21S. Then, the connection notch 22H2 of the operating wall 22S approaches the first fitting claw 23A, and the connection notch 22H2 of the operation wall 22S approaches the first claw support hole 21H1.

  As shown in FIG. 5, the position where the first claw support hole 21H1 and the connection notch 22H2 substantially coincide with each other in the fork insertion direction DF among the possible positions of the connection plate 22 is the connection position of the connection plate 22. It is. When the connecting plate 22 is positioned at the connecting position, the first fitting claw 23A of the first fitting plate 23 passes through the first claw support hole 21H1 and the connecting notch 22H2, and the first fitting plate 23 is connected. Is located at the first fitting position.

  Thus, when the translation of the connection plate 22 advances and the overlap between the connection notch 22H2 of the operating wall 22S and the first claw support hole 21H1 of the guide side wall 21S increases, the first fitting plate 23 is moved. Then, the first non-fitting position starts to return to the first fitting position. And when the connection plate 22 reaches | attains a connection position, the 1st fitting plate 23 will arrive at a 1st fitting position, and, thereby, the displacement with respect to the guide rail 21 of the connection plate 22 is suppressed.

  A portion of the connecting plate 22 that protrudes in the connecting direction DG from the lead-out end wall portion 11 </ b> E <b> 1 of the loading platform 11 is a protruding portion of the connecting plate 22. The length of the protruding portion in the connection direction DG is the largest when the connection plate 22 is located at the connection position, and is approximately half the length of the connection plate 22.

  When the connection plate 22 moves from the standby position to the connection position, the vertical displacement of the connection plate 22 is suppressed by the guide upper wall portion 21T and the guide lower wall portion 21B. The guide upper wall portion 21T and the guide lower wall portion 21B are structures fixed to the cargo bed 11, and are also structures whose positions in the vertical direction are substantially fixed. Therefore, the connecting plate 22 supported by the guide upper wall portion 21T and the guide lower wall portion 21B is also substantially fixed in the vertical direction in the entire range in which the connecting plate 22 moves. That is, the connecting plate 22 positioned at the standby position and the connecting plate 22 positioned at the connecting position are disposed at substantially equal positions in the vertical direction.

  When the connecting plate 22 located at the connecting position receives stress in the direction opposite to the connecting direction DG, the edge of the connecting notch 22H2 contacts the first lead-out side inclined surface 23A1 of the first fitting plate 23. Touch. Part of the stress that pushes the connecting plate 22 in the direction opposite to the connecting direction DG is caused by the contact between the working wall portion 22S and the first lead-out side inclined surface 23A1, and the first fitting plate in the direction opposite to the fork insertion direction DF. It is converted into a force that displaces 23. As a result, the first fitting plate 23 starts to be displaced from the first fitting position toward the first non-fitting position, the tip of the first fitting claw 23A comes out of the first claw support hole 21H1, and then The leading end of the first fitting claw 23A comes off from the standby cutout 22H1, and accordingly, the connecting plate 22 starts to return to the standby position. At this time, the stress required to displace the first fitting plate 23 from the first fitting position to the first non-fitting position is a force that pushes the protruding portion of the connecting plate 22 in the direction opposite to the connecting direction DG. The release force for releasing the holding of the connecting plate 22 by the first holding mechanism 24. Such release force increases as the return suppression angle α increases.

  As shown in FIG. 6A, when the connection end 22E1 of the connection plate 22 is introduced from the introduction end 21E2 of the guide rail 21 of another transport carriage, the tip of the working wall portion 22S constituting the connection end 22E1 is The second abutment side inclined surface 25A2 of the second fitting plate 25 of the other carriage is brought into contact. At this time, the external force that introduces the connecting plate 22 into the guide rail 21 of the other transport cart causes the second fitting plate 25 to pass through the contact between the second introduction side inclined surface 25A2 of the other transport cart and the working wall portion 22S. It is converted into a force that is displaced in the direction opposite to the fork insertion direction DF. As a result, the second fitting plate 25 of the other transport carriage starts to be displaced from the second fitting position toward the second non-fit position, and accordingly, the second fitting pawl 25A of the other transport carriage is used. Begins to come out of the second claw support hole 21H2.

  In addition, when the connection end 22E1 of the connection plate 22 is introduced into the guide rail 21 of another transport carriage, even if the edge 11F of the other transport carriage and the connection end 22E1 accidentally contact each other, the other transport carriage The edge 11 </ b> F guides the introduction end 21 </ b> E <b> 2 into the guide rail 21 according to the shape of the edge 11 </ b> F. Further, as described above, the position in the vertical direction of the connection plate 22 positioned at the connection position is substantially equal to the position in the vertical direction of the connection plate 22 positioned at the standby position, and is determined by the guide rail 21. In the two transport carts connected to each other, the guide rails 21 are both fixed to the cargo bed 11, and the positions of the guide rails 21 in the vertical direction are substantially equal. Therefore, the introduction of the connecting plate 22 to the guide rails 21 of other transport carts proceeds more smoothly.

  As shown in FIG. 6 (b), the tip of the second fitting claw 25A begins to come out of the second claw support hole 21H2, and then the connection plate 22 is further introduced into the guide rail 21 of another transport carriage. When advanced, the tip of the working wall portion 22S constituting the coupling end 22E1 gets over the second introduction side inclined surface 25A2. Thereby, the 2nd fitting plate 25 of another conveyance trolley reaches | attains a non-fitting position. Then, when the introduction of the connecting plate 22 is further advanced with respect to the guide rails 21 of other transport carts, the tip of the second fitting plate 25 of the other transport cart slides on the inner side surface of the working wall portion 22S. The notch portion 22H1 for standby of the operating wall portion 22S approaches the second claw support hole 21H2 of the other transport carriage.

  As shown in FIG. 7, when the standby cutout portion 22H1 of the working wall portion 22S and the second claw support hole 21H2 of the other transport carriage substantially coincide with each other in the fork insertion direction DF, The fitting plate 25 passes through the standby notch 22H1 and the second claw support hole 21H2 and returns to the fitting position again. Almost the entire protruding portion of the connecting plate 22 is introduced into the guide rail 21 of another transport carriage as an introduction target. In this state, the relative displacement between the guide rail 21 of the other transport carriage and the connecting plate 22 is reduced. It is suppressed.

  In the process in which the connecting plate 22 is introduced into the guide rails 21 of other transport carts, the displacement of the connecting plate 22 in the vertical direction is suppressed by the guide upper wall portion 21T and the guide lower wall portion 21B of the other transport carts. . The guide upper wall portion 21T and the guide lower wall portion 21B of other transport carts are structures fixed to the loading platform 11, and their positions in the vertical direction are substantially fixed with respect to the ground plane on which the transport cart is placed. It is also a structure. Therefore, the position of the connecting plate 22 supported by the guide upper wall portion 21T and the guide lower wall portion 21B of other transport carts is also substantially fixed in the vertical direction within the range in which the connecting plate 22 moves.

  At this time, the stress required to displace the first fitting plate 23 from the fitting position to the non-fitting position is a force that pushes the protruding portion of the connecting plate 22 in the direction opposite to the connecting direction DG. This is an operating force for operating the holding of the protruding portion by the holding mechanism 24. Such an operating force is smaller as the introduction promotion angle β is smaller. As described above, since the introduction promoting angle β is smaller than the return suppression angle α, the operating force for operating the holding of the protruding portion is smaller than the releasing force for returning the protruding portion to the guide rail 21. Therefore, in the process in which the connecting plate 22 is introduced into the guide rails 21 of other transport carts, the holding of the projecting portions with respect to other transport carts proceeds before the release of the projecting portions back to the guide rails 21 proceeds. Cheap.

  When the release shaft 27 receives stress in the direction opposite to the fork insertion direction DF, the tip of the release shaft 27 displaces the second fitting plate 25 in the direction opposite to the fork insertion direction DF. As a result, the second fitting plate 25 starts to be displaced from the fitting position toward the non-fitting position, the tip of the second fitting claw 25A comes out of the first claw support hole 21H1, and then the first fitting The front end of the joint claw 23A comes off from the standby cutout portion 22H1, and accordingly, the protruding portion of the connecting plate 22 can be pulled out from another transport cart.

  As shown in FIG. 8, when the protruding portion of the connection plate 22 is held by the guide rail 21 of the other transport carriage 10A, in the transport carriage 10B, the displacement in the vertical direction of the connection plate 22 is the guide upper wall portion. 21T and the guide lower wall portions 21B. Also in the other transport cart 10A, the vertical displacement of the protruding portion that is a part of the connecting plate 22 is suppressed to the guide upper wall portion 21T and each guide lower wall portion 21B of the other transport cart 10A.

  As described above, in the scene where the transport carts 10A and 10B are used, for example, the two transport carts 10A and 10B are connected, and a large number of beverage cases are placed on the transport carts 10A and 10B. Then, the transport carts 10A and 10B in such a state are lifted by the forklift claws and are quickly moved in the distribution warehouse or loaded onto the truck after the movement. At this time, if the two transport carts 10A and 10B are lifted by the forklift claws or moved by the forklift, vibrations from the forklift traveling on the road surface having a step are transmitted to the two transport carts 10A and 10B. . As a result, there is a possibility that the connection between the transport carts 10A and 10B is released due to vibration transmitted to the two transport carts 10A and 10B.

  In this regard, with the above-described configuration, in the transport cart 10B, the displacement in the vertical direction of the connection plate 22 is suppressed by the guide rail 21 of the transport cart 10B, and the vertical displacement of the protruding portion is the other transport. It is suppressed by the guide rail 21 of the carriage 10A. Therefore, the connection between the two transport carts 10A and 10B can be prevented from being released by the vibration transmitted to the transport carts 10A and 10B.

  When the two transport carts 10A and 10B are connected to each other and are lifted by the forklift claw, the position of the forklift claw and the center of gravity of each of the transport carts 10A and 10B is usually There are some differences. Each of the transport carts 10A and 10B supported at a position different from the center of gravity of the transport carts 10A and 10B is tilted so that the center of gravity of the transport carts 10A and 10B is displaced in the vertical direction, for example, with the claw of the forklift as a fulcrum. . As a result, the connecting mechanism 20 that connects the two transport carts 10A and 10B receives a load that causes the connecting mechanism 20 to be bent. For example, when the center of gravity of the transport cart 10A is the center in the connection direction DG and the pawl of the forklift that supports the transport cart 10A is located on the right side of FIG. 8 relative to the center of gravity of the transport cart 10A, the transport cart 10A The cargo bed surface 11S is tilted so that the left end of the cart 10A is lowered and the right end of the transport cart 10A is raised. As a result, the coupling mechanism 20 receives a load so that the right end of the coupling mechanism 20 is lowered.

  In this regard, with the above-described configuration, the connecting plate 22 has approximately half the length of the loading platform 11 in the connecting direction DG, and each guide rail is divided into two in the connecting direction DG. 21 is supported. Therefore, it is possible to increase the resistance against a load that bends the coupling mechanism 20 in the coupling direction DG.

  The length Lj that the connecting plate 22 has in the connecting direction DG is preferably 2/3 of the length Lg that the guide rail 21 has in the connecting direction DG (Lj = 2Lg / 3). With such a configuration, for example, the transport cart 10A accommodates the entire connection plate 22, and the guide rail 21 of the transport cart 10A serves as a space other than the connection plate 22 and is 1 / L of the length Lg of the guide rail 21. An empty space having a length of 3 (Lg / 3 = (3Lj / 2) / 3), that is, an empty space having a length half the length Lj of the connecting plate 22 is formed. This empty space functions as a space into which the protruding portion is introduced.

  The guide rail 21 of the transport carriage 10B is provided with a protruding portion having a length that is 1/3 of the length of the guide rail 21, that is, 1/2 of the length of the connecting plate 22. The connection plate 22, which is 1/3 of the length of the rail 21, remains inside the guide rail 21. That is, a protruding portion having 1/3 of the length of the guide rail 21 is introduced into the transport carriage 10A, and a portion of the connecting plate 22 having the same length as the protruding portion is introduced into the transport carriage 10B. Remains. As a result, when two transport carts 10A and 10B are connected, one connection plate 22 is equally distributed to each of the two transport carts 10A and 10B, and one connection plate 22 is connected to the two transport carts 10A and 10B. 10B is supported almost equally. Therefore, compared with the configuration in which one connection plate 22 is unevenly supported between the two transport carts 10A and 10B, the connection between the two transport carts is released by the vibration transmitted to each transport cart, and further suppressed. It is possible. With such a configuration, it is possible to increase the resistance against the above-described load that bends the coupling mechanism 20 in the coupling direction DG.

  The transport cart is divided into two first areas AE extending in the fork insertion direction DF and aligned in the connection direction DG, and a second area AM extending in the fork insertion direction DF and sandwiched between the first areas AE. Is done. The two first areas AE include a separate caster set 12P for each first area AE. When the transport cart is lifted by the forklift claw, the position of the forklift claw in the connecting direction DG is usually set between the two casters 12 arranged in the connecting direction DG. The two first areas AE are preferably areas where the forklift claws set as described above do not hit, and the second areas AM are areas where the thus set forklift claws hit. In the second region AM, the distance between the lower end of the guide rail 21 that is the lower end of the coupling mechanism and the ground contact surface on which the transport carriage is placed is the mechanism height H20. Moreover, the distance between the lower end of the side wall part 11W and the ground-contact surface where a conveyance trolley is placed is the rib height H11, and the rib height H11 is smaller than the mechanism height H20. That is, in the second region AM, the lower end of the guide rail 21 is located above the lower end of the side wall portion 11W.

  Below the second region AM in the transport cart is a gap into which the forklift claw is inserted in the gap between the loading platform 11 and the ground plane. In such second region AM, if the lower end of the coupling mechanism 20 is positioned above the lower end of the side wall portion 11W, when the transport carts 10A, 10B are lifted by the forklift claws, the forklift claws are It hits the side wall 11W before hitting the connecting mechanism. Further, even if the height of the forklift pawl is erroneously set higher than the lower side of the second region AM and the forklift pawl advances toward the transport carriage, the forklift pawl is moved to the side wall before hitting the coupling mechanism 20. Hit the part 11W. Therefore, the connection mechanism 20 can be prevented from being deformed or the connection between the two transport carriages 10A and 10B being released when the claw of the forklift and the connection mechanism 20 come into contact with each other.

  In particular, if the connection plate 22 that connects the two transport carts 10A and 10B is positioned in the first region AE of each transport cart 10A and 10B, the forklift pawls come into contact with the transport carts 10A and 10B, etc. It is further suppressed that the connection between the two transport carts 10A and 10B is inadvertently released.

  Note that, in a state where the two transport carriages 10A and 10B are connected, it is preferable that the connection end 22E1 of the connection plate 22 reaches the second region AM in the other transport carriage 10A. That is, the length of the connection plate 22 in the connection direction DG is such that the connection end 22E1 of the connection plate 22 reaches the second region AM of the other transport carriage 10A in a state where the two transport carriages 10A and 10B are connected. The size is preferred. With such a configuration, it is possible to increase the resistance against the above-described load that bends the coupling mechanism 20 in the coupling direction DG.

As mentioned above, according to the said embodiment, the effect listed below is acquired.
(1) In the state where the two transport carts 10A and 10B are coupled, the displacement of the connecting plate 22 in the vertical direction is suppressed by the guide rail 21 of the transport cart 10B. Moreover, the displacement in the up-down direction of a protrusion part is suppressed by the guide rail 21 of 10 A of other transport carts. Therefore, it is possible to suppress the connection between the two transport carts 10A and 10B from being released by the vibration transmitted to the transport carts 10A and 10B.

  (2) In the second region AM, since the lower end of the coupling mechanism 20 is positioned above the lower end of the side wall portion 11W, the coupling mechanism 20 is deformed by the contact of the pawl of the forklift with the coupling mechanism 20, or two It is suppressed that the connection of the transport carts 10A and 10B is released.

  (3) Since the releasing force is larger than the operating force, the position of the connecting plate 22 in the transport carriage 10B is maintained at the connecting position based on the large releasing force, and the protruding portion of the connecting plate 22 has a small operating force. Based on this, it is held by the transport cart 10A. Therefore, it is possible to smoothly connect the two transport carts 10A and 10B, and it is possible to increase the holding force of the connected state of the two transport carts 10A and 10B.

  (4) Since the coupling mechanism 20 is disposed below the loading platform surface 11S, the two transport carts can be coupled and the coupling can be released even when the load is placed on the loading platform surface 11S. It is.

In addition, the said embodiment can also be changed and implemented as follows.
-At least one of the 1st holding mechanism 24 and the 2nd holding mechanism 26 may be omitted from a conveyance cart. For example, the first holding mechanism 24 is omitted from the transport cart 10A, and the position of the connecting plate 22 between the two transport carts 10A and 10B is substantially maintained by the second holding mechanism 26 of the other transport cart 10A. It may be a configuration. Further, the second holding mechanism 26 is omitted from the transport cart 10A, and the position of the connecting plate 22 between the two transport carts 10A and 10B is substantially maintained by the first holding mechanism 24 of the other transport cart 10A. It may be a configuration. Further, both the first holding mechanism 24 and the second holding mechanism 26 may be omitted from the transport carts 10A and 10B. Even with such a configuration, as long as the connecting plate 22 is supported by the guide rail 21 in the vertical direction, it is possible to obtain the effects according to the above (1) and (2), and the configuration of the transport cart itself is simple. It is possible to make it easier.

  The release force based on the magnitude of the return suppression angle α may be equal to or less than the actuation force based on the magnitude of the introduction promotion angle β. Even in such a configuration, for example, when connecting the two transport carts 10A and 10B, an external force for holding the guide rail 21 in the connection position is separately applied to the guide rail 21 to thereby provide the two transport carts 10A and 10A, It is possible to smoothly advance the connection of 10B.

  The configuration for making the release force larger than the actuation force is not limited to the difference between the return suppression angle α and the introduction promotion angle β, and the biasing force of the first holding mechanism 24 and the biasing force of the second holding mechanism 26 May be the difference. For example, if the urging force of the first holding mechanism 24 is larger than the urging force of the second holding mechanism 26, the release force is applied to the operating force even if the return suppression angle α and the introduction promotion angle β are the same. It is possible to make it larger.

  -In the 1st holding mechanism 24, the force which hold | maintains the connection plate 22 in a connection position is not restricted to the urging | biasing force of 1st coil spring 24SP, For example, the fitting force between members, magnetic force, etc. may be sufficient. Similarly, in the second holding mechanism 26, the force for holding the protruding portion on the guide rail 21 is not limited to the urging force of the second coil spring 26SP, and may be, for example, a fitting force between members or a magnetic force.

  The rib positioned below the lower end of the coupling mechanism 20 is not limited to the side wall portion 11W that is a part of the peripheral wall of the loading platform 11, but may be any rib that protrudes downward from the loading platform surface 11S. 11L may be sufficient. Even with such a configuration, it is possible to obtain the effect according to the above (2).

  -The lower end of the connection mechanism 20 may be located above the lower end of the side wall part 11W in the 1st area | region AE, and may be located below the lower end of the side wall part 11W. Furthermore, the lower end of the coupling mechanism 20 may be positioned below the lower end of the side wall portion 11W in the second region AM. Even with such a configuration, it is possible to obtain the effect according to the above (1).

  -The quantity of the connection member which comprises a connection mechanism, and the quantity of a guide rail are not restricted to one, and may be two or more. For example, the connection mechanism may include two or more guide rails 21 and a connection plate 22 accommodated in each guide rail so as to be guided, and the plurality of guide rails 21 may be arranged in the fork insertion direction DF. Good.

  The shape of the connecting member constituting the connecting mechanism is not limited to the plate shape extending in the connecting direction DG, and may be, for example, a column shape extending in the connecting direction DG. Any shape may be used as long as the displacement is restricted.

  The structure for supporting the connecting member in the vertical direction is not limited to the wall portion that slides in contact with the connecting member in the vertical direction. For example, the connecting member is configured as a thrust shaft, and the connecting member is mechanically supported in the vertical direction. It may be a mechanism.

  The inner side surface of the guide rail 21 and the outer side surface of the connecting plate 22 may have different shapes. For example, the inner surface of the guide rail 21 has a protrusion that protrudes toward the connecting plate 22, the outer surface of the connecting plate 22 is a plane that makes point contact with the protrusion, and the protrusion that the guide rail 21 has. Alternatively, the plane of the connecting plate 22 may be in sliding contact. On the contrary, the inner surface of the guide rail 21 is a flat surface, and the outer surface of the connecting plate 22 has a protrusion that makes point contact with the flat surface of the guide rail 21. The protrusion may be in sliding contact. In such a configuration, the guide width 21W that the guide rail 21 has is a width that does not include the protrusions that the guide rail 21 has, and the sliding width 22W that the connection plate 22 has also does not include the protrusions that the connection plate 22 has. The guide width 21W and the sliding width 22W may be greatly different.

  The guide rail 21 is not limited to a single plate-like member, and may be configured as a set of two or more members arranged in the connection direction, and extends from the introduction end 21E2 to the lead-out end 21E1 along the connection direction DG. What is necessary is just to have the function which comprises a path | route. For example, the guide rail may be configured by a first guide rail having an introduction end 21E2 and a second guide rail having a lead-out end 21E1. According to such a configuration of the guide rail, the structure and material of the first guide rail are specialized for guiding the protruding portion of the connecting member in the connecting direction, and the structure and material of the second guide rail are And can be configured separately. Therefore, it is possible to reduce the load required for designing the coupling mechanism.

The technical idea grasped from the above embodiment and the modified examples will be described below as additional notes regarding means for solving the problems.
[Appendix 1]
The first holding mechanism has a first fitting portion configured to be movable between a first fitting position and a first non-fitting position, and the first fitting portion is directed to the first fitting position. A first urging portion for urging, and a first fitted portion formed on the connecting member and configured to be fitted to the first fitting portion;
The first fitting portion and the first fitted portion are arranged so that the first fitting portion faces the first fitted portion in a state where the connecting member is located at the connected position. And the first fitting portion located at the first fitting position is fitted with the first fitted portion, whereby the connecting member is held at the connecting position,
The first fitting portion receives the stress in the opposite direction received by the connecting member as the release force that resists the bias through the contact between the first fitting portion and the first fitted portion. A transport cart that has a shape to be converted and is displaced to the first non-fitted position upon receiving the release force, thereby releasing the holding of the connecting member at the connected position.

[Appendix 2]
The second holding mechanism has a second fitting piece configured to be movable between a second fitting position and a second non-fitting position, and directs the second fitting piece toward the second fitting position. The second urging portion for urging, the standby notch portion formed on the projecting portion and configured to be fitted to the second fitting portion, and the urging force of the second urging portion are resisted. An operating portion for applying an external force to the second fitting piece,
The second fitting piece resists the stress in the coupling direction received from the introduction object against the urging of the second urging portion through contact between the second fitting piece and the introduction object. A shape to be converted as motive power, and is displaced to the second non-fitting position in response to the operating force, whereby the introduction target moves in the connecting direction; and the standby cut of the introduction target Allowing the notch and the second fitting piece to face each other;
In a state where the standby notch portion to be introduced and the second fitting piece face each other, the second fitting piece is fitted to the standby notch portion to be introduced, and The transport cart that releases the fitting with the notch for waiting to be introduced when the second fitting piece receives an external force from the operation unit.

[Appendix 3]
Each transport cart is a transport cart constituting a plurality of transport carts that can be connected to other transport carts,
A loading mechanism including a coupling mechanism, a pair of casters arranged in a parallel direction, and a rib protruding downward from the loading platform surface;
The transport carriage extends in the fork insertion direction orthogonal to the juxtaposed direction, and extends in the fork insertion direction, and is sandwiched between the two first regions arranged in the juxtaposition direction. Divided into a second region,
The two first regions include a separate caster for each of the first regions,
In the second region, the transport cart, wherein a lower end of the coupling mechanism is positioned above a lower end of the rib.

  According to the transport cart of Supplementary Note 3, regardless of whether or not the above-described guide rail and connection member are provided, the connection mechanism is deformed by the contact of the pawl of the forklift and the connection mechanism, or the connection of the two transport carts is It is suppressed that it is released.

  DF ... Fork insertion direction, DG ... Connection direction, 10A, 10B ... Carriage carriage, 11 ... Loading platform, 11B ... Back side, 11E ... End wall, 11E1 ... Outlet end wall, 11E2 ... Introduction end wall, 11F ... Edge 11G: Caster accommodating portion, 11L: Partition rib, 11P: Opening portion, 11R: Mechanism accommodating portion, 11S: Loading surface, 11W: Side wall portion, 12: Caster, 12P ... Caster set, 12W ... Wheel, 20 ... Connection Mechanism, 21 ... guide rail, 21B ... guide lower wall, 21E1 ... lead-out end, 21E2 ... introduction end, 21H ... insertion hole, 21H1 ... first claw support hole, 21H2 ... second claw support hole, 21K ... release operation hole , 21S ... guide side wall, 21T ... guide upper wall, 21W ... guide width, 22 ... connection plate, 22E1 ... connection end, 22E2 ... standby end, 22H ... notch, 22H1 ... connection notch, 22 H2 ... Notch for standby, 22P ... Plate operation part, 22S ... Working wall part, 22W ... Sliding width, 23 ... First fitting plate, 23A ... First fitting claw, 23A1 ... First derivation side slope, 23A2 ... first introduction side slope, 23B ... first biased portion, 24 ... first holding mechanism, 24A ... first clamping piece, 24AP ... clamping portion, 24SP ... first coil spring, 25 ... second fitting plate 25A ... second fitting claw, 25A1 ... second lead-out side end surface, 25A2 ... second introduction side slope, 25B ... second biased portion, 26 ... second holding mechanism, 26A ... second clamping piece, 26AP ... Clamping part, 26SP ... 2nd coil spring, 27 ... Release shaft.

Claims (2)

Each transport cart is a transport cart constituting a plurality of transport carts that can be connected to other transport carts,
The cargo bed surface,
A guide rail positioned below the cargo bed surface, having an introduction end and a lead-out end, and constituting a guide path extending from the introduction end to the lead-out end along a connecting direction along the cargo bed surface A guide rail,
A connecting member positioned below the cargo bed surface, wherein the movement of the connecting member along the connecting direction between the standby position and the connecting position is guided by the guide rail; The connecting position includes a portion located below the loading platform surface and a protruding portion that is a portion protruding in the coupling direction from the loading platform surface, and the protruding portion is moved by moving from the standby position to the coupling position. The connecting member provided;
With
The protruding portion of the connecting member at the connecting position is an introduction target,
The introduction target is configured to be able to guide from the introduction end to the guide rail of another transport carriage,
The guide rail includes a regulating portion that regulates displacement of the introduction target introduced into the guide rail and the connecting member in the vertical direction ,
A direction perpendicular to the connection direction on the cargo bed surface is a fork insertion direction,
The transport cart is
A coupling mechanism including the coupling member and the guide rail;
A pair of casters composed of one caster located on the introduction end side;
A pair of casters composed of the other caster located on the lead-out end side;
A loading platform that includes the loading platform surface and a rib that protrudes downward from the loading platform surface and extends in the connecting direction;
The transport cart is
Two first regions extending in the fork insertion direction and arranged in the connection direction;
Extending in the fork insertion direction and partitioned into a second region sandwiched between the first regions,
The two first regions include a pair of separate casters for each of the first regions,
In the second region, the transport cart in which the lower end of the coupling mechanism is positioned above the lower end of the rib . Each transport cart is a transport cart constituting a plurality of transport carts that can be connected to other transport carts,
The cargo bed surface,
A guide rail positioned below the cargo bed surface, having an introduction end and a lead-out end, and constituting a guide path extending from the introduction end to the lead-out end along a connecting direction along the cargo bed surface A guide rail,
A connecting member positioned below the cargo bed surface, wherein the movement of the connecting member along the connecting direction between the standby position and the connecting position is guided by the guide rail; The connecting position includes a portion located below the loading platform surface and a protruding portion that is a portion protruding in the coupling direction from the loading platform surface, and the protruding portion is moved by moving from the standby position to the coupling position. The connecting member provided;
With
The protruding portion of the connecting member at the connecting position is an introduction target,
The introduction target is configured to be able to guide from the introduction end to the guide rail of another transport carriage,
The guide rail includes a regulating portion that regulates displacement of the introduction target introduced into the guide rail and the connecting member in the vertical direction,
A first holding mechanism for holding the connecting member in the connecting position;
A second holding mechanism for holding the protruding portion introduced into the guide rail to the guide rail;
A force applied from another transport cart toward the projecting portion of the transport cart in a direction opposite to the connection direction, and a force required to release the holding by the first holding mechanism is a release force,
The force applied to the second holding mechanism of the other transport cart from the protruding portion of the transport cart in the connecting direction, and the force required to start the holding by the second holding mechanism of the other transport cart Operating force,
A transport cart in which the release force is greater than the actuation force .