JP5367489B2 - Trolley - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a carriage reliably preventing the contact between the body part and the casters, and capable of being piled one above the other. <P>SOLUTION: The carriage 1 includes: a body part 2 having a square shape in a plan view and provided with a placing surface 2a on which an article is placed; and caters 3 attached to the back surface 2b of the body part 2 at the vicinities of the four corners. The body part 2 has projections 41, 42 projecting from the back surface 2b. The projecting lengths of the projections 41, 42 are smaller than the projecting length L2 of the casters 3. When the carriages 1 are piled vertically so that the back surfaces 2b of the body parts 2 are opposed to each other and the long sides of the body parts 2 are perpendicular to each other, the projections 41, 42 of the lower carriage 1 are vertically in contact with the projections 41, 42 of the upper carriage 1. Furthermore, the sum of the projecting lengths L1 and L3 of the projections 42 and 41 vertically in contact with each other is larger than the projecting length L2 of the casters 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a carriage used for transporting articles.

  In general, a carriage used for conveying an article includes a substantially rectangular main body portion having a placement surface on which the article is placed, and casters provided in the vicinity of four corners on the back surface of the main body portion, and is not used. Sometimes stacked and stored. Also, as one of the stacking methods, the cart is rotated by a predetermined angle (for example, 90 degrees) so that the caster of the upper cart is positioned on the outer peripheral side of the outer peripheral edge of the main body of the lower cart. A method of stacking on the upper side (so-called cross stacking) is known (see, for example, Patent Document 1). In this case, the main body mounting surface of the lower cart and the rear main body surface of the upper cart come into contact with each other, and the casters are placed on the main body mounting surface by stacking the carts in the same direction (so-called bar stacking). Compared to the above, the height of the stacked carts can be suppressed.

JP 2004-188997 A

  By the way, when the distance between the casters arranged along the longitudinal direction of the main body is shorter than the width of the main body in the short direction, the main body of the lower cart can be rotated even if the cart is rotated by a predetermined angle and stacked on the upper side. The part placement surface and the upper caster caster are in contact with each other vertically. That is, in this case, it becomes impossible to perform “cross stacking” in which the main body placement surface and the rear surface of the main body are brought into contact with each other and the height of the stacked carriages is suppressed. Also, if the thickness of the main body (up and down width) is shorter than the length of the caster protruding from the back of the main body, when the three carts are cross-stacked, the caster of the top cart is the main body of the bottom cart It will contact the part mounting surface. As a result, the stacked state may become unstable, and there may be a concern about hygiene problems due to the casters coming into contact with the main body portion mounting surface.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a cart that enables stacking that can reliably avoid contact between the main body and the caster. .

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1. A planar rectangular main body having a placement surface on which the article is placed;
In the vicinity of the four corners of the main body, a cart provided with casters attached to the back side opposite to the mounting surface described above,
A protrusion projecting from the back surface of the main body,
The protruding length of the protruding portion is configured to be shorter than the distance from the back surface of the main body portion to the ground point of the caster,
When the carts are stacked up and down so that the back surfaces of the main unit are opposed to each other and the side parts of the main unit are crossed, the protrusion of the lower cart and the upper cart The length of the main body of each cart is a length obtained by adding the projecting length of the projecting portion of the lower carriage and the projecting length of the projecting portion of the upper cart to the projecting portion. It is larger than the distance from the back of the part to the grounding point of the caster ,
When the carts are stacked up and down so that the back sides of the main unit are opposed to each other and the side parts of the main unit are crossed, A carriage having a back side regulating means for regulating relative movement of the other carriage in the horizontal direction with respect to the other carriage without being displaced .

  According to the means 1, the distance between the back surface of the main body part and the grounding point of the caster (caster) can be obtained by making the back surfaces of the main body part face each other and by overlapping the carriages so that the side parts of the main body part intersect each other. Projecting lengths from the back surface of the main body portion) are protruded vertically. By stacking the carts in this way, for example, when the casters of the upper cart are stacked on the mounting surface of the lower cart while avoiding contact between the casters of the upper cart and the lower cart In comparison, the height of the stacked carts can be suppressed.

  Furthermore, the sum of the protrusion lengths of the protrusions that are in contact with each other is larger than the protrusion length from the rear surface of the main body of the caster. For this reason, even if the thickness (vertical width) of the main body is smaller than the protruding length of the caster from the back of the main body, the caster of one of the carts that are vertically stacked with the backs facing each other However, it is possible to avoid a situation in which the main body part of the other car is passed and the car is in contact with the car (for example, the mounting surface of the main part) ahead of the other car. Therefore, stable stacking can be performed, and moreover, it is possible to more reliably prevent a situation in which the placement surface is soiled when the caster comes into contact with the placement surface of the carriage.

  Also, even if the distance between the casters arranged in the longitudinal direction of the main body is shorter than the width of the main body in the short direction, when the carts are stacked up and down with the back surfaces facing each other, It is possible to avoid a situation in which the caster of the carriage comes into contact with the back surface of the main body of the other carriage. Therefore, the effect of being able to perform stable stacking is reliably achieved. Furthermore, since it is not necessary to form a recess or a notch for avoiding contact with the caster when the carriage is stacked on the main body, for example, the recess or the notch on the main body. A problem (for example, the caster cannot be attached at the intended position and the balance of the carriage on which the article is placed is deteriorated due to this) can be avoided.

  In addition, the trolleys are stacked by stacking the trolleys so that the back surfaces (and the mounting surfaces) of the main body part face each other, for example, compared to the case where the trolleys are stacked in a crossing manner such that the mounting surface and the back surface face each other. It is possible to suppress a situation in which the caster comes into contact with the placement surface during the work of stacking. Therefore, the mounting surface of the main body can be kept relatively clean, and can be suitably used as a carriage for transporting articles that require hygiene management.

  In general, the cart is formed in accordance with a ready-made shape such as a container or a cardboard box used in the process of article distribution in order to improve transportation efficiency, storage efficiency, and the like. As a result, the outer periphery of the main body protrudes outward from the outer periphery of the article to be placed, resulting in a problem that extra space is required when the article is placed on a carriage and transported / stored. It can be suppressed as much as possible. Moreover, after ensuring the size and strength of the main body in accordance with the article, effects such as weight reduction, resource saving, and cost reduction of the main body can be achieved. In particular, in this means, the distance between the casters arranged in the longitudinal direction of the main body portion becomes shorter than the width in the short direction of the main body portion by adopting an optimum shape as a carriage for carrying a predetermined article. Even if the thickness of the caster is smaller than the protruding length from the back of the main body of the caster, it is possible to implement a stacking method that can suppress the height of the stacked carriage and improve the hygiene can do. That is, for example, in order to make the distance between the casters arranged in the longitudinal direction of the main body part larger than the width in the short direction of the main body part, it is also necessary to make the main body part larger than the article to be transported. Absent. Therefore, it is possible to obtain a cart having an optimum shape for carrying a predetermined article while configuring the stacking method to be executable.

Moreover, according to the means 1 , the shift | offset | difference movement in the horizontal direction between the trolley | bogies piled up facing the back surfaces can be prevented, or the deterioration of the balance of the trolley | bogies piled up can be prevented. Therefore, it is possible to maintain a suitable contact state between the protrusions, and as a result, the effect of stably stacking the carriages is more reliably achieved.

Means 2 . When the carriages are stacked on the mounting surface of the main body portion so that the mounting surfaces of the main body portions face each other, relative movement in the horizontal direction of the other cart with respect to one cart is restricted. The carriage according to means 1, further comprising mounting surface side restricting means.

According to the means 2, it is possible to prevent the horizontal displacement between the trolleys stacked with the mounting surfaces facing each other, or to prevent the balance of the stacked trolleys from deteriorating. As a result, the effect that the carts can be stably stacked is more reliably achieved.

Means 3 . The cart according to means 1 or 2 , wherein a thickness of the main body is configured to be smaller than a distance from a back surface of the main body to a grounding point of the caster.

According to the means 3 , by making the main body portion as thin as possible, weight reduction, resource saving, cost reduction, and the like can be achieved, and the height of the stacked carts can be suppressed. Further, as described above means 1, a length obtained by adding the protruding length of the contact with projections vertically, since it is larger than the projecting length from the body portion rear surface of the caster, the present means 3 As such, even if the thickness of the main body is smaller than the length of the caster protruding from the back of the main body, the caster of one bogie of the bogies stacked up and down facing each other is It is possible to avoid a situation in which the vehicle passes through the main body and comes into contact with the cart that is ahead.

Means 4 . From the length of the long side portion of the main body portion length minus the length of the short side portion of the body portion, means 1 to 3, wherein the more than 2 times the wheel diameter of the caster A cart according to any one.

According to the means 4 , the cart is more suitable for transporting and storing an article whose bottom is close to a square. In addition, when the casters are suitably arranged with respect to the main body portion of the means 4 , the distance between the casters arranged in the longitudinal direction of the main body portion is basically shorter than the width in the short direction of the main body portion. As described above, the length of the projections of the protrusions that are in contact with the top and bottom is longer than the protrusion length from the back surface of the main body of the caster. It is possible to avoid a situation in which the caster of one of the carts comes into contact with the back surface of the main body of the other cart.

It is the perspective view which looked at the trolley | bogie from the upper surface (mounting surface) direction. It is the perspective view which looked at the trolley | bogie from the lower surface (back surface) direction. It is a perspective view which shows the trolley | bogie which mounted the container. It is a perspective view which shows the cart piled up. It is a perspective view which shows the cart piled up cross-stacked. It is a perspective view which shows the cart piled up cross-stacked. It is a perspective view which shows the cart piled up cross-stacked.

  Hereinafter, an embodiment will be described with reference to the drawings. As shown in FIGS. 1 to 3, the carriage 1 includes a substantially rectangular main body 2 having a mounting surface 2 a on which an article (container C in FIG. 3) is mounted, and in the vicinity of the four corners of the main body 2. The caster 3 is provided on the back surface 2b opposite to the mounting surface 2a. In addition, although mentioned later in detail, as shown in FIG. 4, the trolley | bogie 1 of this embodiment can be piled up in the same direction so that the caster 3 may be mounted on the mounting surface 2a of the main-body part 2 (bar stacking). In addition, as shown in FIG. 7, the main body portion 2 and the casters 3 can be stacked perpendicularly so as not to contact each other (cross-stacking). Further, as shown in FIG. 2, in the cart 1 of the present embodiment, the distance X between the casters 3 arranged along the longitudinal direction of the main body 2 is shorter than the width Y of the main body 2 in the short direction. Yes.

  In addition, the cart 1 of this embodiment is formed in accordance with the shape of the container C so that there is not much difference between the length of the long side portion of the bottom surface and the length of the short side portion, and from the length of the long side portion of the main body portion 2. The length obtained by subtracting the length of the short side portion of the main body 2 is not more than twice the diameter of the wheel 3a of the caster 3. Then, by arranging the casters 3 in a balanced manner with respect to the main body 2, the distance X between the casters 3 arranged along the longitudinal direction of the main body 2 as described above is the width of the main body 2 in the short direction. It is shorter than Y.

  The main body 2 includes a substantially rectangular plate-shaped base plate 11, a peripheral wall portion 12 extending downward from the outer peripheral edge of the base plate 11, and a lattice-shaped reinforcing rib 13 extending downward from the lower surface of the base plate 11. Are integrally formed of polypropylene. Further, the lower end edge of the peripheral wall portion 12 and the lower end edge of the reinforcing rib 13 are at the same height position (the extension length is the same). In this embodiment, the lower end edge of the peripheral wall portion 12 and the reinforcing rib 13 The back surface 2b of the main body 2 is configured.

  The mounting surface 2a of the main body 2 (the upper surface of the base plate 11) is provided with a long side edge convex portion 15 that protrudes upward along the opposing long side portion, and on one of the short side portions. The short side edge convex part 16 which protrudes upwards along is provided. The edge convex portions 15 and 16 can prevent the shift of the article (container C) placed on the placement surface 2a of the carriage 1.

  Attachment portions 17 for attaching the casters 3 are formed in the vicinity of the four corners on the back surface 2b side of the main body portion 2 (the inner peripheral side of the main body portion 2 with respect to the edge convex portions 15 and 16). In addition, although description is abbreviate | omitted, the caster 3 is attached to the attachment part 17 of the main-body part 2 so that attachment or detachment is possible, without using fasteners, such as a volt | bolt.

  Furthermore, a concave portion 18 having a circular shape in plan view is formed on the mounting surface 2a of the main body 2 just behind the mounting portion 17. Then, as shown in FIG. 4, when the two carts 1 are stacked in the same direction so as to place the casters 3 on the mounting surface 2 a of the main body 2 (bar stacking), the concave portion 18 of the lower cart 1. The lower end portion of the caster 3 of the upper cart 1 is accommodated inside. Further, four positioning ribs 19 extending in the outer peripheral direction of the recess 18 are provided at the inner side of the recess 18 at symmetrical positions. In addition, the distance between the positioning ribs 19 adjacent to each other is formed slightly larger than the lateral width of the wheel 3a of the caster 3. As a result, when the wheel 3a of the caster 3 is installed inside the recess 18, both side surfaces of the wheel 3a substantially abut against the positioning rib 19 to prevent displacement of the wheel 3a in the width direction. Therefore, it is possible to stabilize the mounting state when the carts 1 are stacked.

  In addition, the long side edge convex portion 15 is basically formed in the entire longitudinal direction of the main body 2, but in the present embodiment, a position (main body) adjacent to each concave portion 18 in the short direction of the main body 2. The long-side edge convex portion 15 is not formed on the imaginary straight line extending through both central portions of the concave portions 18 arranged in the short direction of the portion 2, and thereby the notch portion 21 is formed. Is formed. Furthermore, in this embodiment, the guide protrusion 22 which protrudes upward from the site | part of the both sides of each notch part 21 among the long side edge convex parts 15 is formed.

  In the present embodiment, the distance between the notches 21 in the longitudinal direction of the main body 2 is the same as the distance between the long side edge convex portions 15 facing each other in the short direction of the main body 2. For this reason, as shown in FIG. 5, when the two carriages 1 are stacked so that the mounting surfaces 2a face each other and the long sides are orthogonal to each other, the notch portion 21 of the lower carriage 1 is stacked. And the position of the notch portion 21 of the upper carriage 1 coincide with each other, and the pair of guide projections 22 facing each other with the notch portion 21 interposed therebetween are the inner surface of the recess 18 and the outer surface of the main body portion 2 (the peripheral wall portion 12). It fits over the outer surface). Thereby, while the upper cart 1 is positioned with respect to the lower cart 1, it is possible to prevent a situation in which the upper cart 1 is displaced in the horizontal direction with respect to the lower cart 1. . Note that the surface of the guide projection 22 that contacts the inner surface of the recess 18 is an inclined surface corresponding to the inner surface of the recess 18 that has a tapered shape that decreases in diameter downward. Moreover, in this embodiment, the guide protrusion 22 comprises a mounting surface side restricting means.

  In addition, the main body 2 is formed with handle holes 24 penetrating vertically corresponding to the respective center positions of the long side part and the short side part. The cart 1 can be carried around. A substantially rectangular opening 25 is formed at the center of the main body 2. The opening 25 can reduce the weight of the carriage 1.

  Further, a connecting rod 27 is rotatably attached to the main body 2 in correspondence with the approximate center position of the short side portion on which the short side edge convex portion 16 is not formed. The connecting rod 27 includes a base portion 31 inserted into a shaft hole 28 penetrating vertically, a fixed portion (screwed) to the lower end portion of the base portion 31, a diameter-enlarged portion 32 having a diameter larger than that of the shaft hole 28, and the base portion 31. An extending portion 33 extending orthogonally from the upper end portion and an engaging portion 34 extending downward from the distal end portion of the extending portion 33 are provided. The shaft hole 28 through which the base portion 31 is inserted is formed in a step portion 36 that is formed one step lower than the mounting surface 2 a of the main body portion 2. The main body 2 is formed with an insertion hole 37 into which the locking portion 34 can be inserted. The insertion hole 37 is formed in a general portion that is not the stepped portion 36.

  The base 31 is formed longer than the thickness of the main body 2 in the stepped portion 36 and is configured to be relatively displaceable up and down with respect to the main body 2. Further, in a state where the locking portion 34 is fitted in the insertion hole 37, the extending portion 33 is located above the placement surface 2 a of the main body portion 2, and together with the edge convex portions 15 and 16, the placement surface. The dropout of the article (container C) placed on 2a is prevented. Further, when the connecting rod 27 is lifted, the locking portion 34 comes out of the insertion hole 37 and the connecting rod 27 becomes rotatable. In this state, after the connecting rod 27 is rotated so that the engaging portion 34 is positioned on the outer peripheral side of the outer peripheral edge of the main body portion 2 (the hand is released from the connecting rod 27), the extending portion 33 and the step portion 36, the extending portion 33 is positioned below the mounting surface 2a of the main body 2 by contacting the upper surface. In this state, the article (container C) placed on the placement surface 2a of the carriage 1 is slid to the short side (the connecting rod 27 side) where the short side edge convex portion 16 is not formed. Can be unloaded.

  Further, a connecting hole 38 into which the engaging portion 34 of the connecting rod 27 can be inserted is formed in the main body portion 2 corresponding to the center of the short side opposite to the side on which the connecting rod 27 is attached. . And the both carts 1 will be connected by inserting the latching | locking part 34 of the connecting rod 27 of the predetermined cart 1 in the coupling hole 38 of the other cart 1.

  Now, as shown in FIG. 2 and the like, the main body 2 is formed with a protrusion 40 that protrudes downward from the back surface 2 b along the peripheral edge of the opening 25. The protrusion 40 includes a long side protrusion 41 extending along the longitudinal direction of the main body 2 and a short side protrusion 42 extending along the short direction of the main body 2. A pair of the long side projection 41 and the short side projection 42 are provided so as to face each other with the opening 25 interposed therebetween. The distance between the pair of long side protrusions 41 is the same as the distance between the pair of short side protrusions 42, and the thickness of the long side protrusion 41 (the width in the short direction of the main body 2) is It is the same as the thickness of the short side protrusion 42 (width in the longitudinal direction of the main body 2).

  Moreover, the long side protrusion 41 is provided with the control protrusion 45 as a back side control means which protrudes below in the longitudinal direction both ends. The protruding length of the long-side protrusion 41 at the portion where the restricting protrusion 45 is formed is the same as the protruding length of the short-side protrusion 42. Furthermore, the protrusion length L1 of the short side protrusion 42 is the protrusion length L2 of the caster 3 protruding downward from the back surface 2b of the main body 2, that is, the grounding point of the caster 3 (wheel 3a) from the back surface 2b of the main body 2. It is shorter than the distance to (the lowest point). Thereby, the situation where the long side protrusion 41 (regulation protrusion 45) and the short side protrusion 42 contact a floor surface is avoided. Further, a length obtained by adding a protrusion length L3 of a portion (hereinafter, referred to as a general portion 46) where the restriction protrusion 45 is not formed in the long side protrusion 41 and a protrusion length L1 of the short side protrusion 42 is The protrusion length L2 of the caster 3 is longer.

  Further, the distance between the restricting projections 45 of each long side protrusion 41 is substantially the same (slightly longer) as the long distance of the short side protrusion 42 (the length of the main body 2 in the short direction). . Further, the long side protrusion 41 (general part 46) and the short side protrusion 42 are provided at point-symmetrical positions, and when the carriage 1 is rotated 90 degrees around the center (substantially the center of gravity position) of the main body 2. The short side protrusion 42 is located at the position where the general part 46 of the long side protrusion 41 is located, and the general part 46 of the long side protrusion 41 is located at the position where the short side protrusion 42 was located. It is like that. In the present embodiment, the thickness (vertical width) of the main body 2 is smaller than the protruding length L2 of the caster 3. Thus, by making the main body 2 as thin as possible, weight reduction, resource saving, cost reduction, and the like can be achieved, and the height of the stacked carts 1 can be suppressed.

  As shown in FIG. 6, when the cart 1 configured as described above is stacked so that the back surfaces 2 b face each other and the long side portions are orthogonal to each other, the general portion 46 of the long side protruding portion 41. And the short side protrusion 42 come into contact with each other in the vertical direction. Furthermore, when the carts 1 are stacked in this way, both ends of the long side projections 42 of the lower cart 1 (short direction of the main body portion 2) are substantially aligned with the restriction projections 45 of the upper cart 1. The both ends in the longitudinal direction of the short side protrusion 42 of the upper carriage 1 are substantially in contact with the regulation protrusion 45 of the lower carriage 1. Thereby, the shift | offset | difference movement in the horizontal direction (front-back left-right direction) of the upper trolley | bogie 1 with respect to the lower trolley | bogie 1 is prevented.

  As described above in detail, according to the present embodiment, the back surface 2b of the main body 2 is opposed to each other, and the carts 1 are vertically stacked so that the long sides of the main body 2 are orthogonal to each other. Thus, the long-side protrusion 41 and the short-side protrusion 42 having a protrusion length shorter than the protrusion length L2 of 3 come into contact with each other in the vertical direction. By stacking the carriages 1 in this way, for example, the upper carriage 1 is placed on the placement surface 2a of the lower carriage 1 while avoiding contact between the casters 3 of the upper carriage 1 and the casters 3 of the lower carriage 1. The height of the stacked carriage 1 can be suppressed as compared with the case where the casters 3 are stacked and stacked (bar stacked).

  Further, the sum of the protruding length L3 of the general portion 46 of the long-side protruding portion 41 and the protruding length L1 of the short-side protruding portion 42 that is in contact with the upper and lower sides is larger than the protruding length L2 of the caster 3. In this embodiment, the distance X between the casters 3 arranged in the longitudinal direction of the main body 2 is shorter than the width Y of the main body 2 in the short direction, but the sum of the protruding length L1 and the protruding length L3 protrudes. Since it is longer than the length L2, it is possible to avoid a situation in which the caster 3 of one cart 1 comes into contact with the main body 2 (back surface 2b) of the other cart 1. Therefore, stable stacking can be performed. Moreover, the caster 3 of one cart 1 out of the carts 1 that are stacked vertically with the back surfaces 2b facing each other passes through the main body 2 of the other cart 1 and the mounting surface of the main body 2 of the cart 1 ahead of it. Since it does not come into contact with 2a, it is possible to prevent a situation in which the mounting surface 2a is soiled when the caster 3 contacts the mounting surface 2a of the carriage 1. Therefore, the mounting surface 2a of the main body 2 can be kept relatively clean and can be suitably used as a carriage for transporting articles that require hygiene management. Furthermore, since it is not necessary to form a recess or a notch for avoiding contact with the caster 3 when the carriage 1 is stacked on the main body 2, for example, Avoid problems associated with forming the notch (for example, the caster 3 cannot be attached to the intended position, and the balance of the carriage 1 on which the article is placed deteriorates due to this). be able to. Further, in order to make the distance X between the casters 3 arranged in the longitudinal direction of the main body 2 larger than the width Y of the main body 2 in the short direction, compared to the article to be transported (container C in this example). There is no need to make the main body 2 extra large. As a result, it is possible to obtain a carriage 1 that is optimal as a carriage for transporting and storing articles (containers C) in which there is not much difference between the length of the long side portion and the length of the short side portion of the bottom surface.

  In addition, when the carts 1 are stacked with the back surfaces 2b of the main body 2 and the mounting surfaces 2a facing each other, for example, the carts 1 are cross-stacked so that the mounting surface 2a and the back surface 2b are facing each other. In comparison with this, it is possible to suppress a situation in which the caster 3 comes into contact with the placement surface 2a during the work of stacking the carts 1.

  Moreover, in this embodiment, when the carts 1 are stacked vertically so that the back surfaces 2b of the main body 2 are opposed to each other and the long sides of the main body 2 are orthogonal to each other, the short side of one cart 1 Both side portions of the protrusion 42 are substantially in contact with the restriction protrusion 45 of the other carriage 1. Thereby, the shift | offset | difference movement in the horizontal direction between the trolley | bogies 1 piled up facing the back surfaces 2b can be prevented, or the deterioration of the balance of the trolley | bogies 1 stacked can be prevented. Therefore, the suitable contact state of the long side protrusion 41 and the short side protrusion 42 can be maintained, and as a result, the effect that the cart 1 can be stably stacked is more reliably achieved. Is done.

  Further, in the present embodiment, when the carriages 1 are vertically stacked so that the mounting surfaces 2a of the main body 2 are opposed to each other and the long sides are orthogonal to each other, the guide protrusion 22 of one carriage 1 is The other carriage 1 is fitted so as to straddle the inner surface of the recess 18 and the outer surface of the main body 2 (the peripheral wall portion 12). Thereby, the shift | offset | difference movement in the horizontal direction between the trolley | bogies 1 piled up facing the mounting surfaces 2a can be prevented, or the deterioration of the balance of the trolley | bogies 1 stacked can be prevented. As a result, the effect that the cart 1 can be stacked stably is more reliably exhibited.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the said embodiment, while making the back surfaces 2b of the main-body part 2 and the mounting surfaces 2a oppose, rotating the trolley | bogie 1 90 degree | times at a time and stacking | stacking, the horizontal shift between the trolley | bogies 1 stacked. Although the movement is configured to be regulated by the regulation projection 45 and the guide projection 22, the movement is not particularly limited to such a configuration. For example, the restriction projection 45 and the guide projection 22 function by stacking the carts 1 so that the long side portions of the main body 2 cross each other at an angle (for example, the carts 1 are rotated 45 degrees each). It is also possible to do. However, when adopting a configuration in which the carriage 1 is rotated 90 degrees and stacked, it is easy to estimate how much the carriage 1 should be rotated in the stacking operation, and workability can be improved.

  Further, for example, when stacking the mounting surfaces 2a facing each other, it is not necessary to consider the interference of the casters 3, and therefore it is not always necessary to stack the side portions of the main body 2 so as to intersect each other. The carts 1 can be stacked so that the outer peripheral edges of the main body 2 are aligned. In this case, since almost the entire mounting surface 2a of the main body 2 is covered, the caster 3 of the carriage 1 installed in a direction in which the caster 3 protrudes downward, and the carriage 1 that is two below the carriage 1 It is possible to avoid a situation where the mounting surface 2a faces (faces). Therefore, it is possible to avoid a situation in which foreign matter or the like adhering to the caster 3 of the carriage 1 installed in a direction in which the caster 3 is convex downward falls on the placement surface 2a and the placement surface 2a becomes dirty. it can.

  Further, in the case where the carriages 1 are stacked so that the mounting surfaces 2a of the main body 2 are opposed to each other and the outer peripheral edges of the main body 2 are aligned with each other, a structure for preventing the displacement such as the guide protrusion 22 is provided. Although it is possible to provide (placement surface side restricting means), the placement surface restriction means may not function simply by aligning the outer peripheral edges of the main body 2 and stacking the same shape of the cart 1. is there. That is, for example, when the mounting surface side regulating means functions by stacking the mounting surfaces 2a facing each other such that a predetermined one side of the main body 2 is vertically aligned, Even if the predetermined one side and the other side opposite to each other are stacked so as to be aligned vertically, the mounting surface side regulating means does not function, and there is a possibility that displacement movement occurs between the mounting surfaces 2a. . Therefore, in the stacking operation, it is not necessary to simply match the outer peripheral shape of the main body portion 2, but it is necessary to perform the operation while confirming whether or not the mounting surface side regulating means is in a functioning direction.

  On the other hand, when the carts 1 are stacked vertically so that the placement surfaces 2a of the main body 2 are opposed to each other and the long sides of the main body 2 are crossed, the placement surface of one of the carts 1 is placed. When the restricting means is configured so that the main body 2 of the other cart 1 can be positioned, the cart 1 stacked on the upper side can be rotated clockwise or counterclockwise as long as there is an intersecting angle. It is possible to perform stacking in which the placement surface side regulating means functions (prevents displacement movement). Therefore, in the stacking operation, it is only necessary to look at the outer peripheral shape of the main body 2 and the workability can be improved.

  (B) In the above-described embodiment, the regulation projection 45 and the guide projection 22 constitute the back side regulation means and the placement surface side regulation means that prevent the positioning of the stacked carts 1 (positioning). However, it is not particularly limited to such a configuration. For example, the back side regulating means is formed in a part different from the long side projecting part 41 and is configured so as to be able to regulate the displacement movement between the carriages 1 in contact with parts other than the short side projecting part 42. Also good. Furthermore, it is possible to omit the back side regulating means and the placement surface side regulating means. However, in order to maintain the contact state between the long side protrusion 41 and the short side protrusion 42 when the back surfaces 2b of the main body 2 are opposed to each other and cross-stacked, at least a back surface regulating means is provided. Desirably, it is also desirable to provide a placing surface side restricting means so that when the placing surfaces 2a of the main body part 2 are stacked facing each other, the balance of the center of gravity of the two carts 1 is not lost. . Further, the back side regulation means (regulation projection 45) is provided on the long side projection 41 or the short side projection 42 and is configured to support the short side projection 42 or the long side projection 41. In this case, the unevenness formed on the back surface 2b side of the main body 2 can be reduced as much as possible.

  (C) Furthermore, in the said embodiment, while the long side edge convex part 15 is each provided along the long side part which the main-body part 2 opposes, the short side edge convex part 16 is along one short side part. However, any or all of these can be omitted. Moreover, it is good also as providing the short side edge convex part 16 along not only one but the short side part which the main-body part 2 opposes, respectively.

  If the protruding length of the long side edge convex portion 15 can be secured relatively large, the long side edge convex portion 15 is not completely omitted in the cutout portion 21 but left to some extent (long side side edge convex portion The notch portion 21 is formed so as to be recessed about half of the protruding length of the portion 15), and the two carriages 1 are stacked so that the mounting surfaces 2 a face each other and the long side portions are orthogonal to each other. The notches 21 may be configured to fit into each other.

  (D) Moreover, in the said embodiment, it is also possible to abbreviate | omit the opening part 25 and the handle hole 24 which were formed in the center part of the main-body part 2. FIG. However, since the handle hole 24 and the opening 25 are formed, one hand is inserted into the handle hole 24 and the main body 2 is gripped, while the other hand is hung on the periphery of the opening 25 and the carriage. 1 can be flipped over. Accordingly, it is possible to improve the stacking workability.

  In addition, in the said embodiment, although the recessed part 18 is formed so that the trolley | bogie 1 can be piled up also in the same direction, you may abbreviate | omit the recessed part 18. FIG. Furthermore, the base plate 11 of the main body 2 may be omitted, and the placement surface 2 a of the main body 2 may be configured by the peripheral wall 12 and the upper edge of the reinforcing rib 13. Further, the connecting rod 27 may be omitted, or instead of the connecting rod 27, a connecting means (an engaging portion and an engaged portion) capable of connecting a plurality of carts 1 to the main body portion 2 itself in the horizontal direction. Part) may be formed. It should be noted that even if the carriage 1 is turned upside down, the state in which the engaging portion 34 of the connecting rod 27 is inserted into the insertion hole 37 is maintained, or the main body portion 2 itself is connected to connecting means (for example, a bar-like shape extending vertically). It is desirable to provide an engaging portion and an engaged portion having a connecting hole that penetrates vertically and into which the engaging portion is inserted.

  (E) In the above embodiment, the carriage 1 (main body 2) is made of polypropylene, but may be made of other resin materials such as polyethylene, PET, polyamide and the like.

  Moreover, in the said embodiment, although the distance X between the casters 3 arranged along the longitudinal direction of the main-body part 2 is embodied in the trolley | bogie 1 comprised shorter than the width Y of the transversal direction of the main-body part 2. Also, the present invention can be applied to a cart configured such that the distance X is longer than the width Y, or a cart having the same distance X and width Y. Furthermore, in the said embodiment, although the thickness of the main-body part 2 is embodied in the trolley 1 smaller than the protrusion length L2 of the caster 3, the thickness of the main-body part 2 is also more than the protrusion length L2 of the caster 3. Can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Carriage, 2 ... Main-body part, 2a ... Mounting surface, 2b ... Back surface, 3 ... Caster, 21 ... Notch part, 22 ... Guide protrusion, 40 ... Protrusion part, 41 ... Long side side protrusion part, 42 ... Short Side projection, 45 ... regulation projection.

Claims (4)

A planar rectangular main body having a placement surface on which the article is placed;
In the vicinity of the four corners of the main body, a cart provided with casters attached to the back side opposite to the mounting surface described above,
A protrusion projecting from the back surface of the main body,
The protruding length of the protruding portion is configured to be shorter than the distance from the back surface of the main body portion to the ground point of the caster,
When the carts are stacked up and down so that the back surfaces of the main unit are opposed to each other and the side parts of the main unit are crossed, the protrusion of the lower cart and the upper cart The length of the main body of each cart is a length obtained by adding the projecting length of the projecting portion of the lower carriage and the projecting length of the projecting portion of the upper cart to the projecting portion. It is larger than the distance from the back of the part to the grounding point of the caster ,
When the carts are stacked up and down so that the back sides of the main unit are opposed to each other and the side parts of the main unit are crossed, A carriage having a back side regulating means for regulating relative movement of the other carriage in the horizontal direction with respect to the other carriage without being displaced . When the carriages are stacked on the mounting surface of the main body portion so that the mounting surfaces of the main body portions face each other, relative movement in the horizontal direction of the other cart with respect to one cart is restricted. The carriage according to claim 1, further comprising mounting surface side regulating means. The cart according to claim 1 or 2 , wherein a thickness of the main body is configured to be smaller than a distance from a back surface of the main body to a grounding point of the caster. Length minus the length of the short side portion of the main body portion from the length of the long side portion of the main body, according to claim 1 to 3, wherein the more than 2 times the wheel diameter casters A cart according to any one of the above.

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