JP2016037217A - Six-wheel carriage with retractable step - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a six-wheel carriage for use in picking in which a step is stored behind the carriage so as not to interfere with a worker during traveling of the carriage.SOLUTION: A six-wheel carriage 100 with a retractable step has a pair of lock wheels 51 at a lower surface of a base plate 34 and in the middle section of a longitudinal direction, and a pair of turnable free wheels 52 at the lower surface of the base plate and in longitudinal direction of the lock wheel, respectively. Frames 31 are mounted in the front-rear edge sides of the base plate, respectively. A step 200 has an upper stage step board 121, a lower stage step board 122, a pair of supporting legs 123 for linking these upper stage step board and lower stage step board and disposed to the left or right, and link mechanisms 131, 132. The step is provided at the rear end side of the carriage so as to be folded and stored. When the step is not used, the upper stage step board and the lower stage step board are positioned substantially vertically, and are brought into a storage state. When the step is used, the upper stage step board and the lower stage step board are brought into a substantially horizontal state, and are extended in the rear side of the carriage.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a manual cart, and more particularly, to a cart equipped with a retractable step suitable for picking from a tall article shelf.

  Conventionally, a six-wheel carriage has been used for picking from an article warehouse by taking advantage of the small turning ability. In the six-wheel carriage, a pair of fixed wheels are provided at both ends in the width direction near the center in the longitudinal direction, and a pair of free wheels are provided at both ends in the length direction and at both ends in the width direction. . A frame-type frame to which an intermediate shelf can be attached is attached to both ends in the longitudinal direction, and articles picked from the article shelf are stored in a plurality of buckets placed on the base plate and the intermediate shelf. Yes.

  By the way, when the ceiling of the warehouse where the article shelf for picking is arranged is high, the article shelf is at least 1.8 m, which is the limit of the height at which an operator can stand while standing on the floor for effective use of the space. There is a demand to increase the height of When the article shelf becomes high, auxiliary means such as a stepladder and a ladder are naturally required to take out the parts on the upper part of the article shelf or temporarily place the article on the upper part. Placing stepladders and ladders on each shelf in a large warehouse is economical and inconvenient, usually with several stepladders and ladders along with picking carts for picking items on the upper shelf Execute. In this case, extra steps are required to transport the stepladder and ladder, and the number of man-hours increases.

  In order to solve such a problem, in order to facilitate picking from a place where it is difficult to take out while standing on the floor at the high position of the article shelf, for example, in the picking cart described in Patent Document 1, A stepping body that can move up and down is provided on the picking cart, and the stepping body is used as a stepladder. When the picker is picked, an operator gets on the stepper so that the stepper descends downward and its lower end is fixed to the floor. On the other hand, when the carriage is moved before and after picking, the tread is returned upward by the spring force so that the end of the tread is not in contact with the floor.

  Moreover, in patent document 2, the trolley | bogie has a ladder so that a worker can access the high place of an article shelf. When the carriage moves, the ladder is folded and placed on the carriage so that the carriage can move without any problem. Further, Non-Patent Document 1 discloses a five-wheel picking cart having three steps on one end in the longitudinal direction. In this step picking trolley, the step is attached to one side surface in the longitudinal direction of the trolley so that the step can be folded to prevent the step from interfering with the transport work of the operator during the transport of the trolley.

JP 2002-114340 A Japanese Utility Model Publication No. 61-34199

Shiro Sangyo Catalog, Internet, June 16, 2014 search (URL: http://webshiro.com/syouhinsetsumei/MC30B-20KGS.html)

  In the conventional picking cart described in Patent Document 1, an article stored at a high place is picked using a ladder having steps provided in the cart body so as to be movable up and down, so that the picking work itself is efficiently performed. Yes. However, the ladder having steps only moves up and down in order to prevent the lower end from touching the traveling path when the carriage travels. It is necessary to grab the carriage, and the ladder gets in the way during traveling. In addition, when the operator rides on the ladder that moves up and down, the ladder can be lowered on the fixed wheel side of the carriage, and the lower end can come into contact with the traveling path to fix the carriage. However, since it is difficult to fix the front free wheel side by the operator's ladder riding operation, the free wheel side of the carriage may move and the operation of the operator may become unstable.

  In the cart with a platform described in the above-mentioned Patent Document 2, the platform formed in a staircase shape is formed so that it can fall and stand around the lower end, so that when used as a platform, the platform is raised and When picking is possible and not used as a platform, it is laid down on the carriage so that the top surface is almost horizontal. However, in the cart described in Patent Document 2, when used as a picking cart, it is necessary to place the article after picking on a platform that is held down on the cart. The article must be removed once and the platform has to be erected, increasing the time required for picking. In addition, the fixing of the wheels when used as a platform is not considered.

  Non-Patent Document 1 discloses a carriage in which one wheel is attached to the front side of the carriage, and two wheels are attached to the front and rear direction intermediate portion and the rear side. In this document, a ladder part having three steps is provided on the rear side of the carriage body for picking from a high place. However, in this trolley, when the ladder portion is folded, the ladder portion is close to the trolley, but the step portion is not folded and protrudes greatly from the trolley body to the rear side. It gets in the way. In addition, a 5-wheel bogie structure is used to make a small turn, but the 5 wheels contain free-wheels that can turn freely. There is no disclosure of holding the wheel stably.

  The present invention has been made in view of the above-mentioned problems of the prior art. The purpose of the present invention is to make a step used as a staircase during picking in a 6-wheel dolly that can be used for picking so as not to disturb the operator when the dolly travels. It is stored in the rear of the cart, and in the stored state, the end surface is substantially parallel to the frame of the cart. It is another object of the present invention to stably fix a cart during picking by using a simple and labor-saving method when using steps as stairs during picking.

  A feature of the present invention that achieves the above-described object is that a pair of fixed rings are provided on the lower surface of the base plate in the middle part in the front-rear direction, and a pair of pivots are provided on the lower surface of the base plate in the front-back direction of the fixed wheel In a 6-wheel bogie having retractable steps each having a free wheel and having a frame attached to the front and rear end sides of the base plate, the upper step plate and the lower step plate and the upper step plate and the lower step plate are connected to the left and right. A step having a pair of arranged support legs and a link mechanism is provided so that it can be folded and stored on the rear end side of the carriage, and when the step is not used, the upper step plate and the lower step plate are positioned substantially vertically and stored. When the step is used, the upper step plate and the lower step plate are in a substantially horizontal state and extend to the rear side of the carriage.

  And in this feature, when the base plate is positioned horizontally and the pair of fixed wheels are grounded, the pair of free wheels arranged in the front-rear direction of the fixed wheels are slightly spaced from the ground plane. A brake mechanism for restricting the rotation of the fixed wheel is provided, and the brake mechanism is a rear end side of the carriage and a foot pedal disposed on the lower surface side of the base plate, and A second link mechanism connected to the foot pedal; a gear provided coaxially with the fixed ring; and a stopper portion connected to an end of the second link mechanism and capable of being moved in and out between the teeth of the gear. It is desirable that

  Further, in the above feature, a handle is attached to the back side of the upper step board, and a pivotable latch mechanism is provided on the frame on the rear end side. When the step is stored, the rear end side of the upper step board is placed on the latch mechanism. It is preferable that when the step is extended by sandwiching and holding, the latch mechanism is rotated to release the latch and the handle is grasped to advance the step backward. A pair of handles held by an operator when the carriage is driven are attached by extending the rear side of the frame on the rear end side, and when the step is in the retracted state, the last end surface of the step is attached to the handle. It is desirable to locate in the vicinity of the rear end position. Further, the link mechanism, the upper and lower treads, and the hinge portion formed on the support leg constituting the step may be configured to be rotatable via a collar disposed on the outer peripheral surface of the fastening bolt.

  According to the present invention, the center of rotation is provided at each of the front end portion of the upper step plate and the middle portion in the front-rear direction of the lower step plate, and the support legs constituting the steps and these upper and lower step plates are connected by a link structure. The steps to be used can be stored behind the cart so as not to disturb the operator when the cart is running. In the stored state, the end face of the step can be made substantially parallel to the frame of the carriage.

  Further, since the fixed wheel of the six-wheel carriage and the support leg of the step are in contact with the traveling surface of the carriage, the carriage can be stably held only by the operator getting on the upper and lower stepboards. Therefore, the cart can be stably fixed at the time of picking by a simple and labor-free method. In addition, a foot pedal type brake is provided on the rear side of the lower part of the step carriage, and the rotation of the fixed wheel provided in the middle part in the front-rear direction of the six-wheel carriage is restricted, so the folding step is stored. When the operator accesses the foot pedal in this state, the cart can be reliably held in a stable state. The cart can be stably fixed in an easy and trouble-free way.

It is a perspective view of one Example of the 6-wheel trolley | bogie provided with the retractable step which concerns on this invention, and is a figure which shows the state which extended the step. It is a perspective view of the 6-wheel trolley | bogie shown in FIG. 1, and is a figure which shows the state which folded the step. It is a figure explaining the operation | movement which extends the step with which the 6-wheel trolley | bogie shown in FIG. 1 is equipped. It is a side view of the 6-wheel trolley | bogie shown in FIG. 1, The figure (a) shows the state which extended the step, and the figure (b) shows the state which folded the step. It is a front view by the side of the step of the 6-wheel trolley | bogie shown in FIG. The principle diagram of the brake mechanism provided in the 6-wheel carriage shown in FIG. 1 (FIG. 1A), the diagram showing the interrelationship of the wheels (FIG. 1B), the operation diagram of the latch mechanism (FIG. 1C) (D)). It is a perspective view which shows the example of a picking operation | work using the trolley | bogie shown in FIG.

  Hereinafter, an embodiment of a six-wheel carriage having a retractable step according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of an embodiment of a six-wheel carriage 100 according to the present invention, and shows a state in which step 200 is extended and used for a picking operation. FIG. 2 is a perspective view showing a state in which the step 200 of the six-wheel carriage 100 shown in FIG. 1 is folded and stored in the rear part of the six-wheel carriage main body 300. FIG. 3 is a diagram showing a state in which the step 200 included in the six-wheel carriage 100 shown in FIG. 1 is being folded and stored in the six-wheel carriage main body 300 or a state in which the step 200 is being extended from the six-wheel carriage main body 300. is there.

  The six-wheel carriage 100 roughly includes a six-wheel carriage main body 300 and a step 200 that is attached to the rear side of the six-wheel carriage main body using a hinge mechanism that will be described in detail later. The six-wheel bogie main body 300 includes a rectangular base plate 34, a pair of frames 32 disposed at both longitudinal ends of the base plate 34, and free wheels 52 disposed at four corners of the lower surface of the base plate 34, A fixed ring 51 is provided on the lower surface of the base plate 34 and in the middle in the longitudinal direction. A foot pedal 60, which is an end portion of a brake device that is locked to the fixed wheel 51, is disposed on the rear end side of the base plate 34 and at the lower portion.

  The frame 32 is formed by bending a hollow quadrangular prism, and is formed in an inverted U shape with two vertical portions 31a extending in the vertical direction and a horizontal portion 31b connecting the two vertical portions 31a and 31a in the horizontal direction. Has been. The lower end 31c (see FIG. 3) of the vertical portion 31a is fitted into holes formed at the four corners of the base plate, and the height thereof is adjusted and locked by a locking device (not shown). The frame 32 is provided with a plurality of stages of intermediate shelf support bars 32 extending in a substantially horizontal direction at intervals in the height direction. An intermediate shelf 35 is appropriately attached between the intermediate shelf support bars 32 of the front and rear frames 31. The intermediate shelf 35 has a flange portion 35a (see FIG. 3) that is engaged with the intermediate shelf support bar 32 at both ends in the longitudinal direction and at both left and right ends in the width direction.

  A C-shaped handle 33 extends backward and is attached to an intermediate portion in the height direction of the vertical portion 31 a of the rear side frame 31. The handle 33 is used as a handle of an operator when the six-wheel carriage 100 is transported or traveled. Further, in the frame 31 on the rear side, a name plate 38 having upper and lower ends of two intermediate shelf support bars 32 adjacent in the vertical direction is attached in the vicinity of the central portion in the left-right direction.

  A latch mechanism 40 is provided in the vicinity of the name plate 38 on the lower side by using two intermediate shelf support bars 32 that are vertically adjacent to each other. As shown in FIG. 3, the latch mechanism 40 connects the two intermediate shelf support bars 32 adjacent to each other in the vertical direction in the vertical direction, and has two columns 42 arranged at intervals in the horizontal direction, Two shafts 43, 44 connected between the two columns 42, 42 and spaced apart in the middle in the vertical direction, and a movable hook 41 rotatably attached to the lower shaft 44 Consists of The upper shaft 43 is a locking shaft with which the hook 41 is locked when the step 20 is folded and stored.

  Next, the step 200 that can be folded and stored includes a rectangular upper step board 121, a rectangular lower step board 122 that has a narrower left and right width and front and rear width than the upper step board 121, and the upper and lower step board 121 when step 200 is extended. , 122 and a pair of left and right support legs 123 that support the load of the operator. The lower end of the support leg 123 is provided with a grounding portion 129 having a cross-sectional area wider than that of the support leg 123 so that stable grounding can be performed during picking. A C-shaped handle 141 is attached to the rear surface of the upper tread 121 for use as a handle of the operator when the step 200 is folded and stored, or when the storage is released and extended.

  The upper step board 121 is connected to the upper end portion of the support leg 123 and a shaft 75 provided on the bracket 121b so as to be rotatable in the vicinity of the rear end portion thereof, and is provided to the rear side frame 31 and the bracket 71 in the vicinity of the front end portion. It is connected via a shaft 72 so as to be rotatable. The lower step plate 122 is an intermediate portion in the front-rear direction, and is pivotally connected to the support leg 123 via a shaft 80. Both end portions of the collar-like support member 125 are connected to the lower left and right support legs 123 slightly below the position where the shaft 80 is attached. The support member 125 restricts the rotation of the lower step plate 122 and supports a load applied to the lower step plate 122.

  The upper step plate 121 is rotatably connected to one end side of the second link member 132 via a shaft 74 attached to a hinge 73 provided on the back side of the upper step plate 121 and in the middle part in the front-rear direction. The other end side of the second link member 132 is pivotally connected to the support leg 123 via a shaft 79 provided at an intermediate portion in the vertical direction of the support leg 123 via a shaft 79. Further, a bracket 77 is provided in the lower part of the rear side frame 32 and in the vicinity of the base plate 34, and one end side of the first link member 131 is rotatably connected to the frame 31 via a shaft 78. . The other end side of the first link member 131 is connected to the vertical intermediate portion of the support leg 123 via a shaft 76 so as to be rotatable.

  The first and second link members 131 and 132, the support leg 123, and the upper and lower step plates 121 and 122 constitute a link mechanism. The bracket 121b and the shaft 75, the bracket 71 and the shaft 72, the bracket 73 and the shaft 74, and the bracket 77 and the shaft 78 constitute a hinge. Similarly, the second link member 132, the lower tread 122, and the shaft 79 also constitute a hinge.

  FIG. 4 shows a side view of the six-wheel carriage 100 in a state where the step 200 is extended (the figure (a)) and a side view of the step 200 portion of the six-wheel carriage 100 when the step 200 is stored in the carriage main body 300. . FIG. 5 shows a front view of the six-wheel carriage 100 as seen from the rear side frame 31. This corresponds to FIG. 4B in which step 200 is stored.

  In the state where step 200 shown in FIG. 4A is extended, the upper step plate 121 and the lower step plate 122 are almost horizontal with the grounding portion 129 provided at the lower end of the support leg 123 installed, and the operator's A safe posture can be maintained during lifting and picking operations. In addition, the height direction space | interval of the upper step board 121 and the lower step board 122, the lower step board 122, and the grounding surface 145 is about 30 cm, and is about a normal staircase, and is the height which an operator can raise / lower smoothly.

  On the lower surface of the base plate 34, free wheels 52 are attached to the front and rear ends of the carriage main body 300 and to the left and right ends, that is, the four corners of the base plate 34. The free wheel 52 has a turning mechanism 56 attached to the upper portion thereof so as to be rotatable around a vertical axis, and a bracket 54 is fixedly attached to the turning mechanism 56. The bracket 54 sandwiches both ends of the shaft of the free wheel 52. A fixed ring 51 is attached via a bracket 53 at a substantially central position between the front and rear free rings 52, 52. The relative position of the fixed wheel 51 with respect to the carriage main body 300 does not change. Further, the outer diameter of the fixed ring 51 is slightly larger than the outer diameter of the free ring 52.

  In the state where Step 200 shown in FIG. 5 is stored in the cart body 300 using the latch mechanism 40, the second link member 132 is located on the outermost side in the left-right direction among the members constituting Step 200. The second link member 132 is also located on the inner side of the vertical portion 31 a of the frame 31. Further, the lower step board 122 is positioned on the inner side in the left-right direction of the upper step board 121.

  FIG. 6 is a diagram illustrating each mechanism attached to the six-wheel carriage 100 according to the present embodiment. 6A is a diagram illustrating the principle of the brake mechanism 90 that fixes the fixed wheel, and FIG. 6B is a diagram illustrating the positional relationship between the fixed wheel 51, the free wheel 52, and the step 200. 6C and 6D are diagrams for explaining the operation of the latch mechanism 40, where FIG. 6C is a latched state, and FIG. 6D is a diagram showing a latch-released state.

  The brake mechanism 90 includes a foot pedal 60 that is an operation input unit, a spring 61 that constantly biases the foot pedal 60, links 62 and 63 that are connected to the foot pedal 60, and a gear 65 that is provided coaxially with the fixed wheel 51. And a stopper that goes in and out between the teeth of the gear 65. The foot pedal 60 is connected to a bracket 66, and the bracket 66 is rotatable around a support shaft 69. A support shaft 68 is also attached to the bracket 66, and one end of a spring 61 is locked to the support shaft 68. The spring 61 is wound around a support shaft 69. The other end of the spring 61 is fixed to a fixed block 67 fixed to the base plate 34.

  A link 62 extending in a bent shape and extending toward the fixed wheel 51 is rotatably connected to an end of the bracket 66 on the inside of the carriage, and a link 63 is further connected to the other end of the link 62. . A stopper 64 that enters and exits from the radial direction is attached to the distal end side of the link 63 between the teeth of the gear 65 attached to the rotation shaft 51 a of the fixed ring 51.

  In the brake mechanism 90 configured as described above, in a normal state where the operator or the foot pedal 60 is not stepped on, the foot pedal 60 is moved to the upper position by the urging force of the spring 61 (in the state shown in FIGS. ). At that time, the stopper 64 disposed at the end of the link mechanism is retracted to a position away from the gear 65.

  When the worker steps on the foot pedal 60 and presses it downward, the pressing force is greater than the urging force of the spring 61, so that the link part moves to the fixed wheel 51 side as a whole. And the stopper 64 attached to the front-end | tip of a link part enters into the inside from the radial direction outer side between the teeth of the gearwheel 65. FIG. The gap between the teeth of the gear 65 is larger than the tooth thickness so that the stopper 64 can easily enter. When the stopper 64 enters between the teeth of the gear 65, the fixed wheel 51 is restricted from rotating and stops the six-wheel carriage 100. In this state, the foot pedal 60 fixing means (not shown) fixes the foot pedal 60. If the fixing means is released, the foot pedal 60 retracts the stopper 64 by the biasing force of the spring 61.

  The cart body 300 used in the present embodiment has a six-wheel structure so as to make a small turn. In the case of the six-wheel structure, when the six wheels are simultaneously brought into contact with the ground contact surface 145, the own weight of the carriage main body 300 and the loaded load are distributed and loaded on the free wheels 52 and the fixed wheels 51. As a result, even with the free wheel 52, the frictional force increases in the movement around the turning axis, and it becomes difficult to turn. In order to avoid this problem, the outer diameter of the front and rear free wheels 52 is made smaller than the outer diameter 51 of the fixed wheel. Further, the height of the fixed wheel 51 and the height of the free wheel 52 are changed. The details are shown in FIG.

  When the base plate 34 of the carriage main body 300 is made substantially parallel to the ground plane 145 and the fixed ring 51 is grounded to the ground plane 145, the front and rear free wheels 52 are not grounded to the ground plane 145. In this state, a gap is generated at the position of the free wheel 52 by an angle θ (θ is about 0.5 °). In actual operation of the carriage 300, the front free wheel 52 or the rear free wheel 52 is installed depending on the weight distribution of the picking articles loaded on the carriage 300, and moves in a four-wheel state together with the fixed wheel 51. Thereby, the small turning property of the normal trolley | bogie provided with the fixed wheel and the free wheel is ensured.

  By the way, in this embodiment, step 200 is attached to the cart body 300. In some cases, step 200 is extended to pick from the picking shelf. For example, as shown in a perspective view in FIG. 7, the worker 140 picks up the article 151 located at the height of the picking shelf 150, extends the step, and picks it up on the upper step board 121 or the lower step board 122. The height H of the picking shelf 150 is increasing year by year in order to effectively use the distribution warehouse, and may be 2 m or more. In that case, work as shown in FIG. 7 is required.

  In the case of the work shown in FIG. 7, step 200 is first extended. However, if the picking box 160 is mounted almost evenly on the main body of the carriage, the rear free wheel 52 is brought into contact with the weight of step 200. Ground to the ground 145. Further, in the state where the step 200 is fully extended and the grounding portion 129 of the supporting leg 123 is grounded to the grounding surface 145, the load of the supporting leg 123 acts as a moment load on the rear free wheel 52. The free wheel 52 loses the degree of freedom of turning. At this time, since the free wheel 52 in front is in a state of floating from the ground contact surface 145, the cart body 300 is not turned even if it is turned.

  In addition, when the worker is on the lower step plate 132 or the upper step plate 131, the weight of the worker is loaded on the rear free wheel 52 as a load, so that the rear free wheel 52 is further prevented from turning. At this time, even if the brake mechanism 90 is not operated, the fixed wheel 51 is not free to turn, the movement in the front-rear direction is restricted by the grounding portion 129 of the support leg 123, and the operator 140 or the six-wheel carriage main body. By sharing the load of 300 and step 200, the position of the six-wheel carriage 100 can be reliably and safely held. However, if the brake mechanism 90 is operated, movement in the front-rear direction at the fixed wheel 51 is limited, so that the six-wheel carriage 100 can be fixed more securely and safely, and the picking operation can be performed stably.

  In the picking work in FIG. 7, the worker 140 is on the upper tread 131. In this case, the worker 140 works at a position higher than the ground contact surface 145 by about 60 cm. However, since it is not necessary to use a safety belt, if the horizontal portion 31b of the frame 31 of the 6-wheel carriage 100, the intermediate shelf support bar 32 to which the intermediate shelf 35 is not locked, or the like is used as the gripping portion. It will be safer work.

  Here, in the picking operation shown in FIG. 7, the picking articles 151 are individually stored in the picking box 160. A mark (barcode) 161 is attached to the side surface of the picking box 160, and the operator 140 reads the mark 161 of the box 160 in advance with a reader that he / she owns and places it on the picked article 151. Read the marked mark with a reader and check it. If the two marks match, they are stored in the pass box 160.

  Next, the latch mechanism 40 will be described with reference to FIG. A pair of support columns 42 (see FIG. 3) that connect the vertically adjacent intermediate shelf support bars 32 in the vertical direction are connected by two laterally extending shafts 44 and 43. A hook 41 is rotatably attached to the lower shaft 44. The hook 41 has a shape obtained by bending an elongated sheet metal, and one end is rounded and attached to the lower shaft. The other end side of the hook 41 is bent in a dogleg shape so as to be caught by the upper shaft 43. The hook is bent a plurality of times along the way, and has a shape that can sandwich the rear end portion (locking end portion) 121a of the upper step plate 121 when the step 200 is latched to the cart body 300.

  When the step 200 is stored in the cart body 300, the upper tread 121 is almost vertical. When the hook 41 is rotated downward, the intermediate portion of the hook 41 sandwiches the locking end portion 121a of the upper tread 121. The hooked portion of the tip of the hook 41 on the shaft 43 acts on the back side as a presser that suppresses the upper step board 121 from coming out rearward (FIG. 6C).

  On the other hand, when releasing the latch to extend step 200, the hook 41 is rotated upward. Since the sandwiching and pressing of the upper tread 121 by the hook 41 is released, the step 200 can be easily extended using the handle 141. In this state, since the hook 41 is hanging, the hook 41 is further rotated, and the hook portion that has been acting as a restraint at the end of the hook 41 is locked to the shaft 43 so that free movement is possible. Restrict.

  In the present embodiment, the attachment positions and shapes of the first and second link members 131 and 132 constituting the step are as shown in FIGS. So that the intermediate portion does not protrude rearward from the support leg 123. Thereby, when the worker 140 moves the 6-wheel carriage 100, the movement is not disturbed. Further, although not shown, each hinge portion is arranged around a shaft fixed with bolts and nuts to secure an optimum clearance, so that the operation at the time of storing and extending in step 200 is smooth. It is trying to become.

  As described above, according to this embodiment, since the step is attached to the rear of the six-wheel carriage, picking an article at a high place using the step while ensuring mobility when the six-wheel carriage is moved. it can. Therefore, conventionally, a ladder is provided for each article shelf, or a ladder in a predetermined place is purposely carried to the article shelf, but such additional work is not required. Note that the steps described in this embodiment are made of aluminum alloy and thus are light in weight, and have a small load when the carriage is moved.

  The nameplate is used for displaying the affiliation of the six-wheeled carriage, but the nameplate may be used as a liquid crystal display board so that the picking contents can be displayed as a list. In this case, the picking operation can be further advanced promptly. The brake mechanism is only an example, and is not necessarily limited to this mechanism. Any mechanism that stops the rotation of the fixed ring is applicable. However, since the operation for restricting the rotation of the fixed wheel is performed with the steps stored, it is optimal to place the foot pedal at the rear end of the six-wheel carriage and in the center in the left-right direction as in this embodiment. It is.

31 ... Frame, 31a ... Vertical portion, 31b ... Horizontal portion, 32 ... Intermediate shelf support rod, 33 ... Handle, 34 ... Base plate, 35 ... Intermediate shelf, 35a ... Bridge, 38 ... Name plate, 40 ... Latch mechanism, 41 ... (movable) hook, 42 ... strut, 43 ... locking shaft, 44 ... shaft, 51 ... fixed wheel, 51a ... rotating shaft, 52 ... free wheel, 53, 54 ... bracket, 56 ... turning mechanism, 60 ... (brake Foot pedal, 61 ... (return) spring, 62, 63 ... link, 64 ... stopper, 65 ... gear, 66 ... bracket, 67 ... fixed block, 68, 69 ... spindle, 71 ... bracket, 72 ... shaft 73 ... Bracket, 74 ... Shaft, 75, 76 ... Shaft, 77 ... Bracket, 78-80 ... Shaft, 81 ... Shaft, 90 ... Brake mechanism, 100 ... 6-wheel carriage, 121 ... Upper step board, 121a ... Locking End, 121b ... Bracket, 1 2 ... lower step plate, 123 ... support leg, 125 ... (lower step plate) support member, 129 ... grounding portion, 131 ... first link member, 132 ... second link member, 140 ... worker, 141 ... handle, 145 ... contact Ground, 150 ... (for picking) shelf, 151 ... (picking) article, 160 ... (for picking) return box, 161 ... mark (barcode), 200 ... step, 300 ... main body of 6-wheel carriage, H ... shelf height , Θ: tilt angle.
4

Claims (6)

A base plate having a pair of fixed wheels on a lower surface of the base plate in an intermediate portion in the front-rear direction; and a base plate having a pair of rotatable free wheels on the lower surface of the base plate in the front-rear direction of the fixed wheel. In a 6-wheel carriage with frames attached to the front and rear end sides,
A step having an upper step plate, a lower step plate, a pair of support legs and a link mechanism connected to the upper step plate and the lower step plate and foldable to the rear end side of the carriage is provided to be retractable. When not in use, the upper step plate and the lower step plate are positioned substantially vertically to be in the retracted state, and when the step is used, the upper step plate and the lower step plate are substantially horizontal and extend to the rear side of the carriage. A six-wheel carriage with a retractable step.   When the base plate is positioned horizontally and the pair of fixed wheels are grounded, each pair of free wheels arranged in the front-rear direction of the fixed wheel forms a slight gap between the ground plane and the ground plane. 6. A six-wheel carriage with a retractable step according to claim 1.   A brake mechanism for restricting the rotation of the fixed wheel is provided, and the brake mechanism is a rear end side of the carriage and a foot pedal disposed on the lower surface side of the base plate, and a second pedal connected to the foot pedal. A link mechanism, a gear provided coaxially with the fixed ring, and a stopper portion connected to an end portion of the second link mechanism and capable of entering and exiting between teeth of the gear. A six-wheel carriage provided with the retractable step according to 1 or 2.   A handle is attached to the back side of the upper step board, and a pivotable latch mechanism is provided on the frame on the rear end side. When storing the step, the rear end side of the upper step board is sandwiched and held by the latch mechanism. 4. When the step is advanced, the latch mechanism is rotated to release the latch and the handle is grasped to allow the step to be advanced rearward. A six-wheel carriage comprising the retractable step according to any one of the above.   A pair of handles held by an operator when the carriage is driven are attached to the rear side of the frame on the rear end side so that the rear end surface of the step is in the retracted state. The six-wheel carriage provided with the steps according to any one of claims 1 to 4, wherein the six-wheel carriage is located in the vicinity of a rear end portion position.   The link mechanism, the upper and lower treads, and the hinge portion formed on the support leg constituting the step are configured to be rotatable through a collar disposed on an outer peripheral surface of a fastening bolt. A six-wheeled carriage provided with the retractable step according to any one of 1 to 5.

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