JP6351560B2 - Transport cart - Google Patents

Description

  The present invention relates to a transport cart for transporting luggage, and more particularly to a transport cart having a brake mechanism for braking rotation of wheels.

  An example of a transport cart having a brake mechanism that brakes rotation of a conventional wheel is described in Patent Document 1, for example. In Patent Document 1, a bracket plate mounted on a rotating shaft of a wheel and held in a predetermined posture with respect to a step, a rotating body having one end attached to the bracket plate, and a brake fixed to the rotating body A transport vehicle with a piece is described.

  In the technique described in Patent Document 1, in the horizontal traveling region of the step, the brake piece is separated from the wheel, while in the inclined traveling region of the step, the rotating body is brought closer to the wheel as the loading platform is tilted. By rotating, the brake piece is brought into sliding contact with the rubber tire.

  In recent years, a transport cart has been used to transport elevator equipment when the elevator is installed on a building structure. And the mechanism for preventing a conveyance trolley falling to the opening part which is the installation location of the elevator formed in the building structure is calculated | required.

Japanese Patent Laid-Open No. 9-2280

  However, the technique described in Patent Document 1 is used when a carriage is mounted on an escalator, and the brake mechanism does not operate unless the cargo bed is tilted. Therefore, for example, when the elevator is installed, when the carriage described in Patent Document 1 is used, there is a problem that the carriage cannot be reliably prevented from falling from the opening.

  In view of the above problems, an object of the present invention is to provide a transport cart that can prevent the vehicle from falling from an opening formed in the ground or a building structure.

In order to solve the above-described problems and achieve the object of the present invention, a transport cart according to the present invention includes a loading platform, a front wheel, a rear wheel, a brake mechanism, a step detection mechanism, and an operation transmission shaft. . The loading platform has a placement surface on which the luggage is placed. A front wheel is provided in the back surface on the opposite side to the mounting surface in a loading platform, and is installed in the front-end part of the advancing direction when conveying a load. The rear wheel is provided on the back surface and is installed at the rear end portion in the traveling direction. The brake mechanism brakes the rotation of the front wheels or the rear wheels. The level difference detection mechanism is provided on the back surface and detects an opening formed in the ground. The operation transmission shaft transmits the operation of the step detection mechanism to the brake mechanism.
The level difference detection mechanism includes a level difference detection unit and a detection side rotation member. The level difference detection unit is arranged in front of the front wheel in the traveling direction and abuts on the ground. The detection-side rotation member supports the level difference detection unit and is rotatably supported on the back surface. The operation transmission shaft transmits the rotation operation of the detection side rotation member to the brake mechanism. The brake mechanism brakes the rotation of the front wheel or the rear wheel in accordance with the rotation operation of the detection-side rotation member transmitted by the operation transmission shaft.

  According to the transport cart of the present invention, it is possible to prevent the vehicle from falling from the opening to the ground or a building structure.

It is a top view shown in the state which looked at the conveyance truck concerning the embodiment of the present invention from the back side of the loading platform. It is a side view which shows the conveyance trolley | bogie concerning the embodiment of this invention. It is a top view which shows the state which looked at the carrier trolley | bogie concerning the embodiment of this invention from the mounting surface side of a loading platform. It is explanatory drawing which shows operation | movement of the transport trolley | bogie concerning the embodiment of this invention. It is a top view which shows the state which the brake mechanism of the transport trolley | bogie concerning the embodiment of this invention act | operated. It is a side view which shows the state which the brake mechanism of the conveyance trolley concerning the embodiment of this invention act | operated. It is a side view which shows the modification of the conveyance trolley | bogie concerning the embodiment of this invention. It is a front view which shows the modification of the conveyance trolley | bogie concerning the embodiment of this invention.

  Hereinafter, embodiments of the transport cart of the present invention will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected to the common member in each figure.

1. First, the configuration of a transport cart according to an embodiment of the present invention (hereinafter referred to as “this example”) will be described with reference to FIGS.
FIG. 1 is a plan view showing a state of the transport cart of this example as seen from the back side of the cargo bed, FIG. 2 is a plan view showing a state of the transport cart as seen from the loading surface side, and FIG. It is a side view which shows a trolley | bogie.

  The transport cart of this example is used for transporting elevator equipment to a hoistway formed in a building structure, for example, when the elevator is installed on a building structure. As shown in FIGS. 1 to 3, the transport cart 1 includes a cargo bed 2, a pair of front wheels 3 and 3, a pair of rear wheels 4 and 4, a brake mechanism 5, a step detection mechanism 6, and an operation transmission shaft. 7, a pusher 8, and an urging member 19.

  As shown in FIGS. 2 and 3, the loading platform 2 is formed in a rectangular flat plate shape. Two concave portions 2c and 2c are formed on the placement surface 2a on which the load on the loading platform 2 is placed. The two concave portions 2c and 2c are formed at the rear end portion in the traveling direction when carrying the load on the placement surface 2a. Moreover, the recessed part 2c is formed in the both ends of the transversal direction in the mounting surface 2a, ie, the both ends of the width direction orthogonal to the advancing direction and a perpendicular direction. A pusher 8 is provided in the two recesses 2c and 2c.

  As shown in FIGS. 1 and 2, a pair of front wheels 3, 3, a pair of rear wheels 4, 4, a brake mechanism 5, and a step detection mechanism are provided on the back surface 2 b of the loading platform 2 facing the mounting surface 2 a. 6 and an operation transmission shaft 7 are arranged.

  The pair of front wheels 3 and 3 is rotatably provided at the front end portion in the traveling direction on the back surface 2b. Moreover, the front wheel 3 is installed in the both ends of the width direction in the back surface 2b. The pair of rear wheels 4, 4 is rotatably provided at the rear end portion in the traveling direction on the back surface 2 b. Moreover, the rear wheel 4 is installed in the both ends of the width direction in the back surface 2b. The loading platform 2 is supported by a pair of front wheels 3 and 3 and a pair of rear wheels 4 and 4.

[Brake mechanism]
The brake mechanism 5 is disposed at the rear end portion in the traveling direction on the back surface 2b. The brake mechanism 5 includes two brake bodies 11, 11, two brake-side rotating members 12, 12, a rotating shaft 13, a brake-side operating shaft 14, and a shaft support portion 16.

  The shaft support portion 16 is disposed on the rear surface side in the traveling direction with respect to the rear wheel 4 on the back surface 2b. A rotation shaft 13 is attached to the shaft support portion 16. The rotation shaft 13 is supported by the shaft support portion 16 and is disposed substantially parallel to the width direction of the back surface 2b. Moreover, the brake side rotation member 12 is rotatably supported at both ends in the axial direction of the rotation shaft 13.

  The brake side rotation member 12 is formed in a substantially flat plate shape. The two brake-side rotating members 12 are formed with a brake-side cam hole 12a and a bearing hole 12b into which the rotating shaft 13 is inserted. The two brake side rotation members 12 are rotatably supported by the rotation shaft 13 and are disposed between the pair of rear wheels 4 and 4.

  The brake-side cam hole 12a is formed at one side in the longitudinal direction of the brake-side rotating member 12 from the bearing hole 12b, that is, at the front end in the traveling direction. The brake side cam hole 12a is a long hole. Moreover, the direction in which the brake side cam hole 12a extends is inclined with respect to the vertical direction and the traveling direction. An end portion of a brake-side operating shaft 14 described later is slidably inserted into the brake-side cam hole 12a.

  The brake body 11 is fixed to the other end portion in the longitudinal direction of the brake-side rotating member 12, that is, the rear end portion in the traveling direction. The brake body 11 is supported by the brake-side rotating member 12 and is disposed to face the rear wheel 4 in a state before the brake mechanism 5 is operated. A contact recess 11 a is formed in the brake body 11. When the brake mechanism 5 is activated, the brake body 11 has the contact recess 11a in contact with the rear wheel 4 to brake the rotation of the rear wheel 4. Thus, by providing the contact recessed part 11a in the brake body 11, the contact area with the rear-wheel 4 can be increased and the braking performance of the brake mechanism 5 can be improved.

  The brake side operation shaft 14 is composed of a rod-shaped member. One end portion of the brake side operation shaft 14 in the axial direction is inserted into the brake side cam hole 12a of the brake side rotating member 12 disposed on one side in the width direction of the back surface 2b. The other end of the brake-side operating shaft 14 in the axial direction is inserted into the brake-side cam hole 12a of the brake-side rotating member 12 disposed on the other side in the width direction of the back surface 2b. The brake-side operating shaft 14 is arranged so that its axial direction is substantially parallel to the width direction of the back surface 2b. An operation transmission shaft 7 is connected to an intermediate portion in the axial direction of the brake side operation shaft 14.

[Operation transmission shaft]
Next, the operation transmission shaft 7 will be described.
The operation transmission shaft 7 is composed of a rod-shaped member. The operation transmission shaft 7 is supported by two transmission support portions 31 and 31 provided on the back surface 2b so as to be movable along the axial direction. The two transmission support portions 31 and 31 are arranged on the back surface 2b with a predetermined interval along the traveling direction. Therefore, the axial direction of the operation transmission shaft 7 is disposed substantially parallel to the traveling direction of the back surface 2b. Further, the movement transmission shaft 7 is restricted from moving in the direction other than the axial direction by the two transmission support portions 31, 31.

  A detection-side operation shaft 23 of the step detection mechanism 6 is connected to one end of the operation transmission shaft 7 in the axial direction, that is, the front end in the traveling direction. Further, the brake side operation shaft 14 of the brake mechanism 5 is connected to the other end portion of the operation transmission shaft 7 in the axial direction, that is, the rear end portion in the traveling direction.

[Step detection mechanism]
Next, the step detection mechanism 6 will be described.
The level difference detection mechanism 6 is disposed between the pair of front wheels 3 and 3 at the front end in the traveling direction of the back surface 2b. The level difference detection mechanism 6 includes a level difference detection wheel 21 that shows an example of a level difference detection unit, two detection side rotation members 22, 22, a detection side operation shaft 23, and a rotation support unit 24. The rotation support part 24 is arrange | positioned at the front-end part of the advancing direction of the back surface 2b.

  The level difference detection wheel 21 is rotatably supported by the two detection side rotation members 22 and 22. Further, the level difference detection wheel 21 is supported by the two detection side rotation members 22, 22 and is disposed so as to protrude forward from the front end portion in the traveling direction of the loading platform 2. Note that the level difference detection wheel 21 only needs to be disposed in front of at least the pair of front wheels 3 and 3 in the traveling direction.

  The level difference detection wheel 21 is in contact with the ground G1 when there is no level difference such as an opening for installing an elevator. In addition, although the example which used the level | step difference detection wheel 21 as a level | step difference detection part was demonstrated in this example, it is not limited to this. As a level | step difference detection part, what is necessary is just a member which does not interfere with the movement of the conveyance trolley | bogie 1, For example, a semicircle shape and a spherical member may be used.

  The detection side rotation member 22 is formed in a substantially flat plate shape. A step detection wheel 21 is rotatably attached to one end of the detection-side rotating member 22 in the longitudinal direction, that is, the front end in the traveling direction. The detection-side rotating member 22 has a detection-side cam hole 22a and a bearing hole 22b.

  The bearing hole 22b is formed in an intermediate portion in the longitudinal direction of the detection-side rotating member 22. A rotation support portion 24 is inserted into the bearing hole 22b. And the detection side rotation member 22 is supported by the rotation support part 24 so that rotation is possible. That is, the level difference detection wheel 21 is rotatably supported by the rotation support portion 24 via the detection side rotation member 22.

  The detection-side cam hole 22a is formed on the other side in the longitudinal direction of the detection-side rotating member 22 from the bearing hole 22b, that is, on the rear end portion in the traveling direction. The detection side cam hole 22a is a long hole like the brake side cam hole 12a. The direction in which the detection-side cam hole 22a extends is inclined with respect to the vertical direction and the traveling direction. An end portion of the detection side operation shaft 23 is slidably inserted into the detection side cam hole 22a.

  The detection side operation shaft 23 is constituted by a rod-shaped member. One end of the detection-side operating shaft 23 in the axial direction is inserted into the detection-side cam hole 22a of the detection-side rotation member 22 disposed on one side in the width direction of the back surface 2b of the two detection-side rotation members 22 and 22. Has been. The other end of the detection-side operating shaft 23 in the axial direction is the detection-side cam hole of the detection-side rotation member 22 disposed on the other side in the width direction of the back surface 2b of the two detection-side rotation members 22 and 22. 22a is inserted. One end portion of the operation transmission shaft 7 in the axial direction is connected to an intermediate portion of the detection-side operation shaft 23 in the axial direction.

[Biasing member]
Next, the urging member 19 will be described. In the transport cart 1 of this example, the urging member 19 is constituted by a tension coil spring. One end of the urging member 19 is fixed to the back surface 2 b of the loading platform 2. The other end of the urging member 19 is fixed to the brake side operation shaft 14. The urging member 19 urges the brake side operation shaft 14 toward the front in the traveling direction.

2. Next, the brake operation of the transport cart 1 having the above-described configuration will be described with reference to FIGS.
FIG. 4 is an explanatory view showing the operation of the transport cart 1, and FIGS. 5 and 6 are views showing a state in which the brake mechanism 5 of the transport cart 1 is operated. Here, operation | movement of the conveyance trolley 1 at the time of conveying an elevator apparatus to the hoistway 101 which shows an example of the opening part of the building structure 100 is demonstrated.

  First, as shown in FIGS. 1, 2, and 4, in a state where there is no step such as the hoistway 101, the step detection wheel 21 of the step detection mechanism 6 is in contact with the ground G <b> 1. Here, the brake side operation shaft 14 of the brake mechanism 5 is urged toward the front in the traveling direction by the urging member 19. Therefore, the operation transmission shaft 7 connected to the brake side operation shaft 14 is also urged forward in the traveling direction by the urging member 19 via the brake side operation shaft 14. Further, the detection side operation shaft 23 connected to the operation transmission shaft 7 is also urged forward by the urging member 19 through the operation transmission shaft 7 in the traveling direction.

  As the detection-side operation shaft 23 is urged toward the front in the traveling direction, the detection-side rotation member 22 is urged in a direction in which the step detection wheel 21 rotates downward in the vertical direction. However, the level difference detection wheel 21 is in contact with the ground G1. Therefore, the rotation operation of the detection side rotation member 22 is restricted, and the movement of the detection side operation shaft 23 is also restricted. Therefore, the movement of the brake side operation shaft 14 connected to the detection side operation shaft 23 via the operation transmission shaft 7 is also restricted.

  By restricting the movement of the brake side operation shaft 14, the rotation of the brake side rotating member 12 in the direction in which the brake body 11 contacts the rear wheel is restricted. Therefore, when there is no level difference, the brake mechanism 11 and the rear wheel 4 are separated from each other without the brake mechanism 5 being operated.

  Next, when the carriage 1 approaches the open end of the hoistway 101, the level difference detection wheel 21 falls to the hoistway 101 due to its own weight and the urging force of the urging member 19. When the level difference detection wheel 21 falls into the hoistway 101, the detection-side rotation member 22 rotates around one end in the longitudinal direction around the bearing hole 22b. Therefore, the other end portion in the longitudinal direction of the detection-side rotating member 22 jumps upward in the vertical direction.

  One end in the longitudinal direction of the detection-side rotation member 22 rotates downward in the vertical direction, so that the detection-side operation shaft 23 is displaced downward in the vertical direction of the detection-side cam hole 22a. Therefore, the detection side operation shaft 23 is moved forward in the traveling direction by the detection side rotation member 22. As the detection-side operation shaft 23 moves toward the front in the traveling direction, the operation transmission shaft 7 also moves toward the front in the traveling direction.

  As described above, the movement of the operation transmission shaft 7 is restricted by the transmission support portion 31 except for its axial direction, that is, the traveling direction. Therefore, the operation transmission shaft 7 can be prevented from swinging upward or downward in the vertical direction, and the operation of the detection-side rotation member 22 of the step detection mechanism 6 can be reliably transmitted to the brake mechanism 5.

  As the operation transmission shaft 7 moves forward in the traveling direction, the brake side operation shaft 14 connected to the operation transmission shaft 7 also moves forward in the traveling direction. As the brake-side operating shaft 14 moves forward in the traveling direction, the end of the brake-side operating shaft 14 is displaced downward in the vertical direction of the brake-side cam hole 12a in the brake-side rotating member 12.

  Then, the end of the brake-side operating shaft 14 slides downward in the vertical direction in the brake-side cam hole 12a, so that the other end in the longitudinal direction of the brake-side rotating member 12 is vertical. A rotational moment is applied in a direction downward in the direction. Therefore, the brake-side rotating member 12 rotates around the bearing hole 12b in a direction in which the other end portion in the longitudinal direction is lowered downward in the vertical direction. Then, the brake body 11 provided at the other end in the longitudinal direction of the brake side rotating member 12 contacts the rear wheel 4. As a result, the rotation of the rear wheel 4 is braked, and the transport carriage 1 stops near the open end of the hoistway 101.

  Thus, according to the transport cart 1 of this example, the brake mechanism 5 can be automatically operated in the vicinity of the opening end of the opening, and the transport cart 1 falls into the opening such as the hoistway 101. This can be surely prevented.

  As described above, the brake side operation shaft 14 is urged forward by the urging member 19 in the traveling direction. That is, the urging member 19 urges the brake side rotation member 12 to rotate in the direction in which the brake body 11 contacts the rear wheel 4 via the brake side operation shaft 14. Therefore, when the brake mechanism 5 operates, the urging force of the urging member 19 is applied to the brake-side rotating member 12 and the brake body 11. As a result, the brake body 11 can be pressed against the rear wheel 4, and the braking capability of the brake mechanism 5 can be increased.

  Further, by adjusting the urging force of the urging member 19, it becomes possible to adjust the braking ability of the brake mechanism 5, that is, the force with which the brake body 11 is pressed against the rear wheel 4.

  In addition, although the example which attached the biasing member 19 to the brake side action | operation axis | shaft 14 was demonstrated in this example, it is not limited to this. The urging member 19 may be urged in the direction in which the brake body 11 of the brake mechanism 5 contacts the rear wheel 4. For example, the urging member 19 may be attached to the detection side operation shaft 23 of the step detection mechanism 6. Alternatively, a torsion coil spring may be applied as the urging member 19 and attached to the rotation shaft of the brake side rotation member 12 or the detection side rotation member 22.

3. Next, a modified example of the transport cart 1 will be described with reference to FIGS.
FIG.7 and FIG.8 is a figure shown about the modification of a conveyance trolley | bogie.

  Here, when there is no large opening such as the hoistway 101 or the like when moving the carriage 1, it may be preferable not to operate the brake mechanism 5 because the carriage 1 can move smoothly. The transport cart shown in FIGS. 7 and 8 is a transport cart having a brake non-operation mechanism for stopping the brake mechanism. Therefore, here, the brake non-operating mechanism will be described, and the same reference numerals will be given to portions common to the transport cart 1 according to the first embodiment, and redundant description will be omitted.

  As shown in FIGS. 7 and 8, the brake non-operation mechanism 40 is provided at the side end portion 2 d in the forward direction of the loading platform 2. The brake non-operation mechanism 40 includes a holding member 41 and a stop pin 42. The stop pin 42 protrudes from the side end 2d of the loading platform 2 toward the front in the traveling direction.

  The holding member 41 is composed of a rod-shaped member. The holding member 41 is rotatably attached to an intermediate portion in the width direction at the side end portion 2d via a shaft portion 44. Further, the holding member 41 is biased to the side end 2 d of the loading platform 2 by a spring member 43 provided on the shaft portion 44.

  An engaging piece 41 a is formed at the end of the holding member 41 opposite to the shaft portion 44. The engagement piece 41 a is formed by bending the end portion of the holding member 41. The engagement piece 41a is inserted into an engagement hole 22c provided in one of the two detection-side rotation members 22A and 22A.

Next, a method for stopping the brake mechanism 5 by the brake non-operation mechanism 40 having the above-described configuration will be described.
As shown in FIG. 8, when the brake non-operation mechanism 40 is not used, the holding member 41 has the engaging piece 41 a hooked on the stop pin 42. When the brake non-operation mechanism 40 is used, the operator first pulls the holding member 41 forward in the traveling direction against the urging force of the spring member 43. When the holding member 41 is pulled out to a position where it does not come into contact with the stop pin 42, the holding member 41 is rotated about the shaft portion 44, and the engaging piece 41a is directed downward in the vertical direction.

  At this time, the operator rotates the detection-side rotation member 22A of the level difference detection mechanism 6 and lifts the level difference detection wheel 21 upward in the vertical direction. Thereby, the brake side rotation member 12 of the brake mechanism 5 is biased by the operation transmission shaft 7 and the brake side operation shaft 14, and the brake body 11 rotates in a direction away from the rear wheel 4.

  Next, the operator inserts the engagement piece 41a of the holding member 41 into the engagement hole 22c of the detection-side rotation member 22A. Thereby, the detection-side rotation member 22A is held by the holding member 41. Therefore, the rotation in the direction in which the level difference detection wheel 21 in the detection-side rotation member 22A is lowered in the vertical direction is restricted. As a result, the stop operation of the brake mechanism 5 by the brake non-operation mechanism 40 is completed.

  In order to make the brake mechanism 5 operable again, the engagement piece 41a of the holding member 41 is pulled out from the engagement hole 22c of the detection-side rotation member 22A. And what is necessary is just to rotate the detection side rotation member 22A and to make the level | step difference detection wheel 21 contact the ground G1.

  The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention described in the claims.

  In the embodiment described above, the example in which the transport cart 1 is stopped by providing the brake mechanism 5 on the rear wheel 4 side and braking the rotation of the rear wheel 4 has been described. However, the embodiment is not limited thereto. Absent. For example, the transport cart may be stopped by providing a brake mechanism on the front wheel 3 side and braking the rotation of the front wheel 3. In this case, the length of the operation transmission shaft 7 that connects the brake mechanism and the step detection mechanism can be shortened.

  However, when the brake mechanism is provided on the front wheel, the front wheel may fall into an opening formed on the ground together with the step detection portion of the step detection mechanism before the brake mechanism is operated. Therefore, the brake mechanism is preferably provided on the rear wheel as in the above-described embodiment.

  Further, in the above-described embodiment, the example in which the transport cart is used during the elevator installation work has been described, but the present invention is not limited to this. The transport cart of this example is used at a platform of a station, a work place having an opening on the ground, and other various sites.

  DESCRIPTION OF SYMBOLS 1 ... Carriage trolley, 2 ... Loading platform, 2a ... Mounting surface, 2b ... Back surface, 2d ... Side edge part, 3 ... Front wheel, 4 ... Rear wheel, 5 ... Brake mechanism, 6 ... Step detection mechanism, 7 ... Actuation transmission shaft 8 ... Pusher, 11 ... Brake body, 11a ... Abutting recess, 12 ... Brake-side rotating member, 12a ... Brake-side cam hole, 12b ... Bearing hole, 13 ... Turning shaft, 14 ... Brake-side operating shaft, DESCRIPTION OF SYMBOLS 16 ... Shaft support part, 19 ... Energizing member, 21 ... Step detection wheel (step detection part), 22 ... Detection side rotation member, 22a ... Detection side cam hole, 22A ... Detection side rotation member, 22b ... Bearing hole 22c ... engagement hole, 23 ... detection side operating shaft, 24 ... rotation support, 31 ... transmission support, 40 ... brake non-operation mechanism, 41 ... holding member, 41a ... engagement piece, 42 ... stop pin, 43 ... Spring member 44 ... Shaft part 100 ... Building structure, 101 ... Hoistway (opening), G1 ... Ground

Claims (6)

A loading platform having a placement surface on which the luggage is placed;
A front wheel provided on the back surface opposite to the loading surface in the cargo bed, and installed at a front end portion in a traveling direction when transporting the load;
A rear wheel provided on the back surface and installed at a rear end of the traveling direction;
A brake mechanism for braking rotation of the front wheel or the rear wheel;
A step detecting mechanism that is provided on the back surface and detects an opening formed in the ground;
An operation transmission shaft for transmitting the operation of the step detection mechanism to the brake mechanism,
The step detection mechanism is
A step detecting portion disposed in front of the traveling direction with respect to the front wheel and contacting the ground;
A detection-side rotation member that supports the step detection unit and is rotatably supported on the back surface;
The operation transmission shaft transmits the rotation operation of the detection side rotation member to the brake mechanism,
The said brake mechanism brakes rotation of the said front wheel or the said rear wheel with the rotation operation | movement of the said detection side rotation member transmitted with the said operation transmission shaft. An urging member that is provided on the brake mechanism, the operation transmission shaft, or the step detection mechanism, and that urges the operation transmission shaft in a direction in which the brake mechanism brakes rotation of the front wheel or the rear wheel. Item 4. The carriage according to Item 1. The transport cart according to claim 1, wherein the brake mechanism brakes rotation of the rear wheel. The back surface has a transmission support portion that supports the operation transmission shaft,
The transport cart according to claim 1, wherein movement of the operation transmission shaft in a direction other than the axial direction of the operation transmission shaft is restricted by the transmission support portion. The step detection mechanism is
A detection-side operation shaft that is slidably inserted into a detection-side cam hole formed in the detection-side rotation member and connected to the operation transmission shaft;
The brake mechanism is
A brake body abutting against the front wheel or the rear wheel;
A brake side rotating member that supports the brake body and is rotatably supported on the back surface;
The transport cart according to claim 1, further comprising: a brake-side operation shaft that is slidably inserted into a brake-side cam hole formed in the brake-side rotation member and connected to the operation transmission shaft. The transport carriage according to claim 1, wherein the step detection unit is a step detection wheel that is rotatably supported by the detection-side rotation member.

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