JP6445885B2 - Transport cart - Google Patents

Description

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

  In a large warehouse or the like, in order to efficiently store a large amount of articles, a storage shelf is provided in which a plurality of storage units that can store a plurality of articles are provided vertically and horizontally. In such a storage shelf, in order to automate the work of carrying in or out the goods and to improve the efficiency of the work, a traveling rail that can access the goods is laid in the housing portion, and this traveling rail can be self-propelled. Transport equipment that uses In addition, as shown in Patent Document 1, recently, a transport facility has been developed in which frontage is provided on both sides of the housing part where both ends of the traveling rail are located so that a transport cart can enter and exit from each frontage. In addition, it is possible to select a front door close to the article loading / unloading position and arrange the carriage, thereby shortening the work time for loading / unloading the article.

  In such a transport facility, there is a demand for a technique that can recover a failed transport cart when the transport cart fails and does not move while traveling on a travel rail. In addition, a transport facility for recovering a failed transport cart has been developed (Patent Document 2).

  The transportation facility of Patent Document 2 includes a child carriage (conveyance carriage) that can be self-propelled on a guide rail (traveling rail), and a rescue carriage that can be connected to the child carriage. In the event of a failure, the rescue cart is advanced from the end of one end of the guide rail to the vicinity of the slave cart, the projection of the slave cart is engaged with the connector of the rescue cart, and the rescue cart is connected to the slave cart. By retracting, the broken child cart can be pulled and collected from the guide rail.

Japanese Patent No. 3138983 (page 4, FIG. 1) Japanese Examined Patent Publication No. 61-42681 (page 3, FIG. 9)

  However, the transport facility shown in Patent Document 2 is a structure in which the rescue cart includes a connector at the front end and approaches from the one side toward the protrusion provided at the rear end of the sub cart, Therefore, it cannot be approached from both the front and rear. Therefore, because the rescue cart goes to rescue the slave cart from one side regardless of the position on the guide rail (travel rail) where the slave cart breaks down, the distance to rescue is long depending on the location where the slave cart breaks down, It will take time to rescue the child cart. Even if the child carriage and the rescue cart shown in Patent Document 2 are adopted in the transfer equipment provided with the frontage in each of the accommodating portions located at both ends of the traveling rail as shown in Patent Document 1, as described above, For this reason, since the connecting direction of the rescue cart with respect to the slave cart is limited to only one side, it is not possible to select the guide rail entrance close to the faulty slave cart as the entrance for the rescue cart to enter and leave.

  The present invention has been made paying attention to such problems, and an object of the present invention is to provide a transport cart that can recover a transport cart that has failed on a traveling rail without being aware of its direction.

In order to solve the above problems, the transport carriage of the present invention is
A carriage provided on the vehicle body for placing and supporting the article and capable of self-propelling along the traveling rail,
In the transport carriage, structural members having engaging recesses are provided at both front and rear ends of the vehicle body, and at least on the travel direction side of the transport carriage, the structural member of another transport carriage on the travel direction side is provided. The connection member provided with the engagement protrusion part engaged with the engagement recessed part of the said another conveying cart by contact | abutting can be attached and detached.
According to this feature, each transport carriage is provided with a structural member having an engagement recess at both front and rear end portions of the vehicle body, and a connecting member is attached to a traveling direction side that is a side toward another transport carriage. By running, the engagement protrusion automatically engages with the engagement recess of another conveyance carriage by utilizing the contact between the connecting member of the own conveyance carriage and the structural member of another conveyance carriage. It will be. That is, since the engagement protrusion is engaged with the engagement recess of another conveyance carriage from either side in the front-rear direction of the broken conveyance carriage, the direction of the broken conveyance carriage and the broken position are conscious. Even if the conveyance carriage with the connecting member attached is entered from any side of the running rail, the broken carriage can be quickly recovered from the running rail.

In the connecting member, when the structural members of the adjacent transport carriages are in contact with each other, the engaging protrusion inserted into the engaging recess is separated from the back end surface of the engaging recess. It is a feature.
According to this feature, even if the structural members of the adjacent transport carriages come into contact with each other, the engagement protrusion is separated from the back end surface of the engagement recess, so that the engagement protrusion Is not pressed by the structural member, and the failed transport cart can be pushed without applying a load to the engaging protrusion.

The contact surfaces between the structural members and the engagement recesses are provided at least at the left and right corners of the vehicle body.
According to this feature, the contact surfaces and the engaging recesses between the structural members are provided in the vicinity of the rigid body that supports the wheels of the vehicle body. The force can be distributed to the high-strength parts of the car body.

The connecting member can be attached to and detached from the structural member.
According to this feature, since the force applied when pulling or pushing the failed transport carriage is concentrated on the structural member, it is possible to suppress a large force from being applied to the vehicle body.

It is a side view which shows the state which a conveyance trolley drive | works the traveling rail of a storage shelf. It is a perspective view which shows the structure of a conveyance trolley | bogie. It is a principal part disassembled perspective view which shows the state which attaches a connection member to a conveyance trolley. It is a side view which shows the state which has arrange | positioned the collection trolley | bogie to the traveling rail same as a failure trolley | bogie. It is a side view which shows the state which the collection trolley approached the failure trolley | bogie. It is a side view which shows the state with which the failure trolley | bogie and the collection trolley | bogie were connected.

  EMBODIMENT OF THE INVENTION The form for implementing the conveyance trolley | bogie which concerns on this invention is demonstrated below based on an Example.

  The transport cart according to the first embodiment will be described with reference to FIGS. 1 to 6. Hereinafter, the left side of the screen in FIG. 1 will be described as the front side (front side) of the storage shelf on which the transport carriage is arranged.

  As shown in FIG. 1, the transport cart 1 stores a specified article 3 in a predetermined storage in the storage shelf 2 in a large warehouse or the like in which a plurality of storage shelves 2 including a plurality of storage portions 2 a are provided on the top, bottom, left, and right. It is used when carrying in or carrying out the part 2a. A pair of opposed running rails 4 having a substantially L-shaped cross section are laid on the storage shelf 2, and a plurality of pallets 5 on which articles 3 are placed are supported on the upper end surface 4 a of the running rail 4.

  The configuration of the transport carriage 1 will be described. As shown in FIG. 1 and FIG. 2, the transport carriage 1 has a vehicle body 6 capable of traveling on the traveling surface 4 b of the traveling rail 4, and a mounting table that supports the article 3 and can be moved up and down with respect to the vehicle body 6. 7, an elevating drive unit (not shown) for raising and lowering the mounting table 7, and a traveling device 12 that enables the transport carriage 1 to travel on the traveling rail 4. As shown in FIG. 1, after the mounting table 7 travels on the traveling surface 4 b of the traveling rail 4 in the lowest lowered state separated from the lower surface of the pallet 5 and enters the lower side of the pallet 5 (the leftmost pallet in the lower stage of FIG. 1). 5), the article 3 is lifted together with the pallet 5 by raising the mounting table 7, and the pallet 5 and the article 3 are lifted from the upper end surface 4a of the traveling rail 4 by a predetermined height and transported. (The second pallet from the left in the bottom of Fig. 1 5 below shows a solid line.). In the transport carriage 1, the operator selects the front doors 2c, 2c provided at both ends of each housing portion 2a, and a forklift or the like (not shown) is used to travel from the front door 2c to the vicinity of the front door 2c. It is arranged or removed from the end of the rail 4.

  As shown in FIG. 2, the cover of the vehicle body 6 of the transport carriage 1 is formed by bending the front and rear of a metal plate. The vehicle body 6 includes a traveling device 12 for traveling, a bumper 8, a frame member 9 (structural member). ), A lifting drive unit for lifting and lowering, a control device, and a battery as a power supply device are arranged. The control device includes a drive motor control unit that drives and controls a driving motor for traveling, and a lift motor control unit that drives and controls a lift motor for lifting and lowering.

  The traveling devices 12 and 12 are mainly configured by a drive motor, drive wheels 13 and 13, and a plurality of driven wheels 14, 14. The drive motor is connected to a drive motor control unit via a cable (not shown), and the drive motor control unit is connected to a battery built in the vehicle body 6. Then, the drive motor control unit supplies electric power to the drive motor based on the command signal, rotationally drives the drive motor in the forward direction or the reverse direction, and the drive wheels 13 and 13 are driven by the drive motor to drive the driven wheels 14 and 14,... Follow, and the vehicle body 6 travels stably on the traveling surface 4b of the traveling rail 4.

  Object detection means 10, 10 using an ultrasonic sensor, a photoelectric sensor or the like is disposed on the vehicle body 6 of the transport carriage 1. The object detection means 10 and 10 can detect objects on the front side and the rear side, and the transport carriage 1 on which the article 3 to be newly received is placed is placed on the traveling rail 4 that has already been received. It is mainly used in detecting the placed article 3 and in the deceleration process described later.

  In-vehicle sensors 11 are provided on the front and rear sides of the vehicle body 6. The in-stock sensors 11 and 11 use photoelectric sensors, detect the articles 3 and the pallet 5 on the mounting table 7 of the transport cart 1 through the holes 7a and 7a provided in the mounting table 7, When the carriage 1 raises the placing table 7 and lifts the article 3 together with the pallet 5, the carriage 1 is used to control the position of the conveyance carriage so that the conveyance carriage 1 is positioned approximately in the center of the pallet 5 in the front-rear direction. Yes.

  Bumpers 8 and 8 are attached to the front and rear surfaces of the vehicle body 6 so as to extend in the left-right direction with a cushioning material such as rubber, so that the shock-absorbing action when the transport cart 1 collides with an obstacle during traveling. I play. Each of the bumpers 8 and 8 has a hollow tube shape and is provided with switches 81 and 81 which are contact-sensitive sensors (see an enlarged portion in FIG. 4). The bumper 8 is elastically deformed when the transport carriage 1 collides with an obstacle during traveling, and the inner surface of the bumper 8 comes into contact with the switch 81 due to this elastic deformation, so that the switch 81 is turned on. Thus, when the switch 81 is turned on, the drive motor control unit stops the power supply to the drive motor according to the signal, and the process of stopping the traveling of the transport carriage 1 is performed.

  2 and 3, frame members 9, 9 are detachably attached to the front and rear sides of the vehicle body 6 with bolts or the like so as to cover both ends of each bumper 8. ing. The frame member 9 includes a substantially U-shaped rigid member 91 that is fixed to the vehicle body 6 and an elastic member 92 such as hard rubber that is fixed to the distal end surface of the rigid member 91. When the vehicle collides with the transport carriage 1 in the direction, the impact force is buffered by the elastic member 92, and the strength of the front and side surfaces of the vehicle body 6 is relatively increased via the rigid member 91. (See FIG. 6).

  Each rigid member 91 is provided with a shaft member 93 that extends vertically and is fixed. The shaft member 93 abuts against the side surface of the traveling rail 4 and guides the traveling of the transport carriage 1. Each of 15 is rotatably mounted. Further, the upper plate 91a of each rigid member 91 is provided with an engagement hole 16 (engagement recess) capable of engaging an engagement protrusion 20d (engagement protrusion) of the claw member 20 described later.

  Further, as shown in the enlarged portion of FIG. 4, the long holes 17 are formed in the side plates 91b facing the center of the vehicle body 6 in the rigid members 91, respectively. It extends horizontally and its tip 17a extends downward. Further, the end 9a of the frame member 9 is provided with through holes 9b penetrating in the front-rear direction. Bolts 18 having a head having a diameter larger than that of the shaft portion are provided in the through-holes 9b in the front-rear direction. It is movably inserted. When the frame member 9 collides with an obstacle in front, the elastic member 92 is deformed and the bolt 18 is moved to press the bumper 8 so that the inner surface of the bumper 8 contacts the switch 81, and the switch 81 is turned on. (See FIG. 6).

  The article 3 is carried in or out using the carriage 1 configured as described above. However, the carriage 1 may fail to run on the running rail 4 due to a failure of the traveling device 12 or the like during the loading / unloading operation. is there. As indicated by the alternate long and short dash line in the upper housing portion 2a in FIG. 1, the transport carriage 1B that has become unable to travel (hereinafter referred to as a failed carriage 1B) is obstructed by the carry-in / out operation and is therefore removed from the travel rail 4. There is a need. In such a case, a collection operation for collecting the broken carriage 1B from the traveling rail 4 is performed using the transport carriage 1A (hereinafter referred to as a collection carriage 1A).

  As shown in FIG. 3, the collection carriage 1 </ b> A is formed by attaching a connecting member 19 to one end of the conveyance carriage 1 that is separate from the malfunction carriage 1 </ b> B. Details of the attachment of the connecting member 19 will be described later. According to this, by attaching the connecting member 19 to the transport cart 1 used for a plurality of transport facilities, it is possible to obtain a recovery cart 1A for recovering the failed cart 1B. There is no need to prepare, and the manufacturing cost for the transport equipment can be reduced.

  The connecting member 19 is mainly composed of claw members 20 and 20 and a pivot shaft 21. The claw member 20 is formed of a rigid member such as metal, and includes a base 20a, a lower protrusion 20b that extends further downward from one side of the lower end of the base 20a, and one side from the upper end side of the base 20a. And a downward flange-shaped flange portion 20c extending in the vertical direction. The base portion 20a has a hole 22 that is formed at a position close to the vehicle body 6 and penetrates left and right. The flange portion 20c has a curved hook shape and an engagement protrusion extending inwardly toward the distal end. 20d. Further, the pivot shaft 21 is formed by a metal rod or the like extending in the left-right direction, and male screw portions 21a and 21a into which nuts 23 and 23 are respectively screwed are formed at both ends thereof.

  When attaching the connecting member 19 to the transport carriage 1, first, spring washers and the like are inserted into both ends of the pivot shaft 21, and the claw members 20 and 20 are inserted through the holes 22 and 22, respectively. The collars 24 and 24 are inserted outside the claw members 20 and 20 at both ends of the pivot shaft 21, and both ends of the pivot shaft 21 are inserted into the distal ends 17 a of the long holes 17 and 17 of the rigid members 91 and 91. 17a, and the collars 24, 24 are fixed to both ends of the pivot shaft 21 at positions where the collars 24, 24 contact the side plates 91b, 91b of the rigid members 91, 91. Thereafter, the nuts 23 and 23 are screwed in directions away from each other, whereby the base portion 20a and the base portion 20a are sandwiched between the nuts 23 and 23 and the collars 24 and 24 and fixed to the pivot shaft 21, and the connecting member 19 is fixed. Attached to the transport carriage 1. As described above, the long holes 17 and 17 of the rigid members 91 and 91 can be used to construct the rigid members 91 and 91 while shifting the long pivot shaft 21. Easy to attach between the members 9 and 9). As shown in the enlarged portion of FIG. 4, both end portions of the pivot shaft 21 can be rotated within the distal end 17 a of the long hole 17, so that the engagement protrusions 20 d and 20 d of the claw members 20 and 20 are formed. It can swing up and down.

  Further, as shown in the enlarged portion of FIG. 4, the connecting member 19 has a center of gravity shifted from the pivot shaft 21 toward the engagement protrusion 20 d, and the lower protrusion 20 b is formed on the bumper 8. Abutting and restricting the downward movement of the engaging protrusion 20d (clockwise direction in the enlarged view of FIG. 4) is restricted. In a state where the downward swing of the engaging protrusion 20d is restricted, that is, in a natural state where the connecting member 19 is attached, the engaging protrusion 20d is from a line γ extending from the upper surface of the upper plate 91a of the rigid member 91. Is also located slightly below. Since the claw member 20 is light, the switch 81 does not react in a natural state in which the lower protrusion 20b contacts the bumper 8.

  Next, a recovery operation for actually recovering the broken cart 1B using the recovery cart 1A will be described. When the broken carriage 1B occurs on the traveling rail 4, the connecting member 19 is attached to constitute the collecting carriage 1A, and as shown in FIGS. 1 and 4, the connecting member 19 is moved to the broken carriage 1B side. In this state, the collection carriage 1A is arranged in the traveling rail 4 from the front opening 2c (in this embodiment, the front opening 2c) near the broken carriage 1B, and the collection carriage 1A travels toward the broken carriage 1B. . Although not shown, the operation of causing the collection cart 1A to travel is performed by an operator using an operation terminal such as a tablet while viewing the state of the collection cart 1A. Further, when the recovery carriage 1A detects the failed carriage 1B on the front side of the failed carriage 1B by the object detection means 10, the drive motor control unit decelerates the drive motor by the signal, and the deceleration of the recovery carriage 1A Processing is performed.

  As shown in FIG. 5, when the collection carriage 1A is brought close to the failure carriage 1B and the engagement protrusion 20d of the claw member 20 comes into contact with the frame member 9 ′ on the rear surface side of the failure carriage 1B, The mating protrusion 20d swings upward about the pivot shaft 21 and rides on the upper surface of the frame member 9 'of the broken carriage 1B. Therefore, no impact force acts on the claw member 20 from the frame member 9 ′ of the broken carriage 1 </ b> B. Further, since the engaging protrusion 20d has an inwardly tapered shape, the claw member 20 can easily ride on the upper surface of the frame member 9 'of the failed carriage 1B.

  As shown in FIG. 6, when the collection carriage 1A is further brought closer to the failed carriage 1B from the state shown in FIG. 5, the engaging projection 20d swings downward due to the weight of the claw member 20, and the frame of the failed carriage 1B is obtained. It is dropped into the engagement hole 16 of the member 9. Further, when the end surface 92a of the elastic member 92 of the recovery cart 1A and the end surface 92a ′ of the elastic member 92 ′ of the failed cart 1B come into contact with each other, the bolt 18 moves as described above to turn on the switch 81 of the bumper 8. Therefore, the traveling of the collection cart 1A is stopped. As a result, even when the engagement protrusion 20d is operated at a position where it is difficult for the operator to see, it can be recognized that the connection between the collection carriage 1A and the broken carriage 1B is completed when the collection carriage 1A stops. .

  Thereafter, when the collection carriage 1A travels in the direction of the arrow R, the engagement protrusion 20d and the engagement hole 16 are engaged, and the failure carriage 1B is pulled by the driving force of the collection carriage 1A, via the frontage 2c. Thus, the recovery carriage 1A and the failure carriage 1B can be recovered from the traveling rail 4 (see FIG. 1).

  In addition, from the state of FIG. 6, by making the collection carriage 1A travel in the direction of arrow F, the malfunction carriage 1B can be pushed and collected. As shown in FIG. 6, when the frame members 9 and 9 'of the recovery cart 1A and the failure cart 1B are in contact with each other, the engagement projection 20d extends from the end surface 92a of the elastic member 92 in the recovery cart 1A. Since the dimension α to the distal end surface is shorter than the dimension β from the end surface 92a ′ of the elastic member 92 ′ to the rear end surface 16a of the engagement hole 16 in the failure carriage 1B, the engagement protrusion 20d is engaged with the engagement hole 16. It is in the state which was separated without abutting on the back end face 16a. For this reason, when the broken carriage 1B is pushed forward, the engagement protrusion 20d is not loaded, and it is not necessary to perform a process for giving the engagement protrusion 20d special rigidity. It is possible to prevent the engagement protrusion 20d and the engagement hole 16 from coming off by riding on the upper surface of the frame member 9 of the rear end surface 16a.

  Thus, since each conveyance cart 1 is provided with the engagement holes 16 at both the front and rear ends, even if it breaks down on the traveling rail 4, the recovery cart 1A with the connecting member 19 at the head becomes the fault cart 1B. By making it drive | work toward, it can be connected from either front and back, without being conscious of the direction of the failure | damage cart 1B. Therefore, since the frontage 2c close to the broken carriage 1B is selected and the collection carriage 1A is arranged in the traveling rail 4 and the broken carriage 1B can be rescued in the shortest distance, the work time required for collecting the broken carriage 1B Can be shortened. In addition, the frontage 2c is selected in a direction in which it is easy to rescue due to the load situation of the broken carriage 1B or the failure situation of the traveling device 12, and the broken carriage 1B is pulled or pushed toward the frontage 2c. Can be recovered. Further, when a large driving force is required for recovery, two recovery carts 1A can be connected.

  Further, when the engagement protrusion 20d is engaged with the engagement hole 16, the end surface 92a of the elastic member 92 in the collection carriage 1A and the end surface 92a of the elastic member 92 in the failure carriage 1B are close to or in contact with each other. Therefore, when the recovery cart 1A and the faulty cart 1B are connected (pulling or pushing), the end portion 9a of the frame member 9 of the faulty cart 1B is connected to the engagement protrusion 20d of the recovery cart 1A and the frame member 9. It is possible to travel with a sense of unity while being restricted with the end 9a. Therefore, for example, in order to determine whether to push and collect or to pull and collect, it is possible to determine which one needs the smaller driving force by pushing or pulling the broken carriage 1B. Further, even when the recovery cart 1A is stopped while being pushed by the recovery cart 1A, the failure cart 1B can be prevented from being separated from the recovery cart 1A due to inertial force by the engagement protrusion 20d. Further, since the engagement protrusion 20 has a curved hook shape and the engagement hole 16 is provided in the upper plate 91a, the engagement protrusion 20 sandwiches the upper plate 91a substantially vertically when towing, and the engagement protrusion 20 is engaged. It is difficult to come off from the joint hole 16.

  Further, since each frame member 9, 9,... Is provided at the front and rear corners of the vehicle body 6 of the transport carriage 1, the force applied when pulling or pushing the broken carriage 1B by the collection carriage 1A is applied to the vehicle body. 6 can be dispersed in a portion having high strength. For example, even when the traveling device 12 on the left and right sides of the broken carriage 1B breaks down, the collection carriage 1A can be pulled or pushed in a balanced manner without rotating the broken carriage 1B in the horizontal direction.

  Further, since the connecting member 19 is detachable with respect to the frame members 9 and 9, the force applied when pulling the failed carriage 1B is concentrated on the frame members 9 and 9, and a large force is applied to the vehicle body 6 side. This can be suppressed. Since the connecting member 19 can be disassembled, the connecting member 19 can be disassembled by removing the connecting member 19 from the collecting cart 1A except when necessary, and can be stored compactly. The removed connecting member 19 may be accommodated in the transport carriage 1. In this case, loss of the connecting member 19 can be prevented.

  In the present embodiment, the aspect in which the engagement hole 16 with which the engagement protrusion 20d is engaged is formed in the frame member 9 is described. However, the present invention is not limited to this. An engaging recess in which the engaging protrusion 20d can be engaged may be formed on the member 9.

  Further, the connecting member 19 is not limited to being attached to the frame members 9, 9, and an attachment may be provided on the vehicle body 6, and the connecting member 19 may be attached to the attachment. Moreover, the connection member 19 is not restricted to the aspect of the said Example, For example, the nail | claw members 20 and 20 may be attached so that it can rock | fluctuate separately by each pivot attachment axis | shaft. Further, the connecting member 19 is not limited to the one in which the engaging protrusion 20d is engaged with the engaging hole 16 due to the weight of the claw member 20, and the engaging protrusion 20d is engaged with the engaging hole 16 by the biasing force of a spring, for example. You may come to do.

  Further, the frame member 9 may be configured by only the rigid member 91, and the configuration of the elastic member 92 may be omitted. The frame member 9 may be fixed to the vehicle body 6 by welding or the like.

  Further, the engagement protrusion 20d is not limited to the loose fit in the engagement hole 16, but the engagement protrusion 20d fits in the engagement hole 16 with almost no gap, and the failure carriage 1B is secured by the engagement protrusion 20d. You may make it tow or push.

  Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments, and modifications and additions within the scope of the present invention are included in the present invention. It is.

  For example, in the above-described embodiment, a mode has been described in which one frontage 2c is provided on each side of each housing portion 2a and the transport carriage 1 can approach from both sides of the traveling rail 4. However, there may be one frontage. Even if there is no restriction in the front-rear direction of the transport carriage 1 that travels on the travel rail 4 and the frontage is one transport facility, the transport carriage 1 is provided with the engagement holes 16 at both front and rear ends. Rescue is possible without being aware of the direction of the transport carriage 1 that has failed on the rail 4.

  In the above embodiment, the bolt 18 and the switch 81 of the bumper 8 are used as means for sensing that the recovery cart 1A and the failure cart 1B are in contact with each other. However, the present invention is not limited to this. And when the current detector detects that the amount of current flowing to the drive motor has increased, it may be detected that the collection carriage 1A and the failure carriage 1B are in contact with each other. Further, there is no special means for sensing that the collection cart 1A and the broken cart 1B are in contact with each other. For example, when an operator visually or abuts the collection cart 1A and the broken cart 1B, the collection cart 1A The stopping operation may be performed manually.

DESCRIPTION OF SYMBOLS 1 Conveyance cart 1A Recovery cart 1B Failure cart 2c Frontage 3 Article 4 Running rail 4b Running surface 6 Car body 7 Mounting table 8 Bumpers 9, 9 'Frame member (structural member)
12 traveling device 13 traveling wheel 16 engagement hole (engagement recess)
16a Deep end surface 17 of engagement hole 18 Long hole 18 Bolt 19 Connection member 20 Claw member 20d Engagement protrusion (engagement protrusion)
21 Pivoting shaft 81 Switch 91 Rigid member 92, 92 'Elastic member 92a, 92a' End surface (contact surface) of elastic member
F, R Arrow α Dimension β Dimension γ Line

Claims (4)

A carriage provided on the vehicle body for placing and supporting the article and capable of self-propelling along the traveling rail,
In the transport carriage, structural members having engaging recesses are provided at both front and rear ends of the vehicle body, and at least on the travel direction side of the transport carriage, the structural member of another transport carriage on the travel direction side is provided. A transporting carriage characterized in that a connecting member provided with an engaging protrusion that engages with an engaging recess of the other transporting carriage by being brought into contact can be attached and detached.   In the connecting member, when the structural members of the adjacent transport carriages are in contact with each other, the engaging protrusion inserted into the engaging recess is separated from the back end surface of the engaging recess. The conveyance cart according to claim 1, wherein   3. The transport carriage according to claim 1, wherein the contact surface between the structural members and the engagement recess are provided at least at left and right corners of the vehicle body.   The transport cart according to any one of claims 1 to 3, wherein the connecting member is attachable to and detachable from the structural member.

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