JP3222872U - Carriage for transportation - Google Patents

Abstract

A transport cart capable of performing sufficient start-up assistance is provided. A transporting carriage has an assist mechanism unit that drives a wheel forward by a stepping force of a pedal unit, and the assist mechanism unit receives a stepping force of a pedal unit 20 and rotates reversely, and a pedal unit. Is attached to the drive shaft of the fixed wheel 15 on the rear side of the cargo bed via a one-way clutch 23a, and a first pinion 24a that rotates forward by receiving reverse rotation of the gear in a meshed state. And the second pinion, the one-way clutch allows forward rotation of the drive shaft of the fixed wheel but restricts reverse rotation, and forwardly rotates the drive shaft of the fixed wheel when the pinion rotates forward. When the pedal portion returns to the initial position, the meshing state of the gear, the first pinion and the second pinion is released. [Selection] Figure 4

Description

  The present invention relates to a carriage for carrying luggage.

  Conventionally, when a transporter or the like transports a relatively heavy baggage, a transport cart of a type in which an operator travels by pushing the operation handle with a hand has been used. Such a transport cart There is also known one provided with an assist mechanism unit that assists the start of the transporting carriage by rotating the rear wheels by the stepping force of the stepping unit (see, for example, Patent Document 1).

JP-A-2015-101230

  However, the transportation cart as disclosed in the above-mentioned patent document has a problem that the assisting efficiency is poor and sufficient start-up assistance cannot be performed because the assist distance by the assist mechanism is short.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a transport carriage that can perform sufficient start-up assistance by improving the assist efficiency of the assist mechanism section.

  According to the first aspect of the present invention, the wheel is driven forward by a loading platform that moves by the rotation of the wheel, an operation handle provided on the rear end side of the loading platform, and a stepping force of a pedal portion that faces the rear side of the loading platform. An assist mechanism unit, wherein the wheels include a left universal wheel and a right universal wheel provided on the front side of the cargo bed, a left fixed wheel and a right fixed wheel provided on the rear side of the cargo bed, The assist mechanism includes a gear that rotates in reverse by receiving the depression force of the pedal, a biasing member that rotates the gear forward to return the pedal to the initial position, and A first pinion that is attached to the drive shaft of the left fixed wheel via a one-way clutch and rotates forward in response to reverse rotation of the gear in a meshed state, and a drive shaft of the right fixed wheel via a second one-way clutch Take And a second pinion that rotates forward in response to the reverse rotation of the gear in a meshed state, and the first one-way clutch allows the forward rotation of the drive shaft of the left fixed wheel but reversely rotates. When the first pinion rotates forward, the drive shaft of the left fixed wheel is rotated forward, and the second one-way clutch allows forward rotation of the drive shaft of the right fixed wheel but restricts reverse rotation. When the second pinion rotates forward, the drive shaft of the right fixed wheel is rotated forward, and when the pedal unit returns to the initial position, the engagement between the gear and the first pinion and the second pinion is released. It is characterized by that.

  The invention according to claim 2 is the transport carriage according to claim 1, wherein the operation handle includes a pair of column portions respectively erected from the left and right end sides on the rear end side of the cargo bed, and the pair of pairs. And a notch portion facing between the pair of strut portions from the rear end portion to the front end portion of the load platform at the rear end portion of the load platform. It is characterized by that.

  The invention described in claim 3 is the transport cart according to claim 1 or 2, further comprising a brake mechanism portion that brakes rotation of the left fixed wheel and the right fixed wheel, wherein the brake mechanism portion includes A brake operation unit provided on the steering wheel, a transmission member for transmitting a braking force according to the operation of the brake operation unit, and braking the left fixed wheel and the right fixed wheel by the braking force transmitted by the transmission member The brake operation unit includes a brake lever that converts between a non-operation state and an operation state, and a lock member that locks the brake lever in the operation state.

  According to the transporting carriage of the present invention, it is possible to improve the assist efficiency by the assist mechanism unit and perform sufficient start assist.

It is a perspective view of the trolley | bogie for conveyance in this invention. It is a perspective view of the assist mechanism part of the trolley | bogie for conveyance. It is sectional drawing of the assist mechanism part periphery of a trolley | bogie for conveyance. It is an operation | movement figure which shows the assist operation | movement by an assist mechanism part. It is an operation | movement figure which shows the brake operation | movement by a brake mechanism part.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

(Composition of transportation cart)
The configuration of the transport carriage 1 in the present embodiment will be described with reference to FIGS.
A carriage 1 according to this embodiment includes a loading platform 2 on which a load is placed, an operation handle 3 provided on the rear end side (left side in FIG. 1) of the loading platform 2, and wheels provided on the back side of the loading platform 2. 4, an assist mechanism unit 5 for rotating the wheel forward, and a brake mechanism unit 6 for braking the rotation of the wheel.

  The loading platform 2 is a rectangular plate material that is longer in the front-rear direction than in the left-right direction, and is rounded at four corners on the front-rear and left-right. The front side of the operation handle 3 is an effective placement surface for the luggage, and the rear side of the operation handle 3 is an invalid placement surface for the luggage.

  The operation handle 3 includes a pair of support pillars 3a and 3b erected from right and left ends (both sides of a notch part 2a described later) on the rear end side of the loading platform 2, and the tips of the pair of support pillars 3a and 3b. A gripping portion 3c spanned between the portions and a fall prevention member 3d spanned in the middle of the pair of column portions 3a and 3b are provided. The operator grips the grip portion 3c and moves the transport carriage 1. The operation handle 3 may be either a fixed type or a foldable type.

  At the rear end portion of the loading platform 2 serving as an invalid placement surface, a notch portion 2a is provided in which a portion located between the pair of support columns 3a and 3b is recessed toward the front end portion of the loading platform 2. In this way, by providing the notch 2a at the rear end of the loading platform 2 that becomes an invalid placement surface, the area of the invalid placement surface is reduced, thereby reducing costs and reducing the weight of the transportation carriage. Is possible. In addition, the operator's feet are less likely to collide with the loading platform 2 when carrying the luggage, and the workability can be improved.

  The wheel 4 includes a left front wheel 11 and a right front wheel 12 that are pivotally supported by a pair of caster-type front wheel support portions 10, and a left rear wheel 14 and a right rear wheel 15 that are pivotally supported by a fixed rear wheel support portion 13. I have. The left front wheel 11 and the right front wheel 12 are free wheels (left free wheel, right free wheel) in which the directions of the wheels change. The left rear wheel 14 and the right rear wheel 15 are fixed wheels (left fixed wheel, right fixed wheel) in which the direction of the wheels does not change.

  The left rear wheel 14 rotates together with the left drive shaft 14a when the tip of the left drive shaft 14a is inserted into a key groove provided on the wheel, and the key 14b provided on the left drive shaft 14a engages with the key groove. . A split pin 14c is hit at the tip of the left drive shaft 14a so that the left rear wheel 14 is not removed.

  The right rear wheel 15 is rotated together with the right drive shaft 15a when the tip of the right drive shaft 15a is inserted into a key groove provided on the wheel and the key 15b provided on the right drive shaft 15a engages the key groove. . A split pin 15c is hit at the tip of the right drive shaft 15a so that the right rear wheel 15 is not removed.

  The rear wheel support portion 13 includes a first support member 16 that supports a proximal end portion of the left drive shaft 14a and a proximal end portion of the right drive shaft 15a, a distal end portion of the left drive shaft 14a, and a distal end portion of the right drive shaft 15a. A second support member 17 is provided for support.

  The 1st support member 16 is formed in the cross-section square shape which defines the 1st accommodation space K1 opened in the direction of order. The left side wall 16a is provided with a first left opening 16c into which the left bearing 18a is fitted, and the right side wall 16b is provided with a first right opening 16d into which the right bearing 18b is fitted.

  The second support member 17 is disposed inside the first accommodation space K1 and closer to the right side in the left-right direction, and is formed in a cross-sectional shape that defines a second accommodation space K2 that opens in the front-rear direction. . The left side wall 17a is provided with a second left opening 17b into which the left bush 19a is fitted, and the right side wall 17c is provided with a second right opening 17d into which the right bush 19b is fitted.

  The left rear wheel 14 is supported by a left bearing 18a in which the base end portion of the left drive shaft 14a is fitted in the first left opening 16c, and the distal end portion of the left drive shaft 14a is fitted in the second left opening 17b. It rotates in the front-rear direction by being supported by the left bush 19a.

  The right rear wheel 15 is supported by a right bearing 18b in which the base end portion of the right drive shaft 15a is fitted in the first right opening 16d, and the right end in which the distal end side of the right drive shaft 15a is fitted in the second right opening 17d. It rotates in the front-rear direction by being supported by the bush 19b. The left drive shaft 14a and the right drive shaft 15a can rotate independently on the same axis.

  The left side wall 16a and the right side wall 16b of the first support member 16 are provided with a pair of flange portions 16e and 16f extending forward, and the pair of flange portions 16e and 16f are respectively provided in the front-rear direction. The slide openings 16g and 16h extending to are opened.

  Further, the left wall 17a of the second support member 17 is provided with a wire bracket 17i extending in the left direction, and a screw hole 17j (see FIG. 5) is provided on the distal end side of the wire bracket 17i. ing.

  The assist mechanism unit 5 includes a pedal member 20 for an operator to step on with his / her foot, a gear 21 that reversely rotates by a stepping force received by the pedal member 20, and a forward rotation of the gear 21 to return the pedal member 20 to the initial position. A torsion spring 22 (see FIG. 4) as an urging member, a first one-way clutch 23a attached to the tip of the left drive shaft 14a, a second one-way clutch 23b attached to the tip of the right drive shaft 15a, A first pinion 24a attached to the left drive shaft 14a via the first one-way clutch 23a and a second pinion 24b attached to the right drive shaft 15a via the second one-way clutch 23b are provided.

  The pedal member 20 includes a pedal portion 25 for an operator to step on with his / her foot, and a pair of pedal support portions 26 a and 26 b for supporting the pedal portion 25. The pedal portion 25 is formed in a columnar shape (cylindrical shape) extending in the left-right direction. The pair of pedal support portions 26a and 26b extend in the front-rear direction and are formed in a plate shape facing each other with an interval in the left-right direction. The pedal portion 25 is fixed to the rear end portions of the pair of pedal support portions 26a and 26b in a state where the left and right end portions are sandwiched between the pair of pedal support portions 26a and 26b.

  The gear 21 is formed in a substantially fan shape that rotates about a rotation shaft 21a extending in the left-right direction, and is supported by the second support member 17 so as to face the second accommodation space K2. Further, the side surface portion separated from the rotating shaft 21a is fixed to the tip portions of the pair of pedal support portions 26a and 26b in a state of being sandwiched between the pair of pedal support portions 26a and 26b. For this reason, when an operator steps on the pedal portion 25, the operator rotates backward about the rotation shaft 21a.

  The torsion spring 22 has a coil portion 22a inserted through the rotation shaft 21a of the gear 21, a first arm portion 22b extending downward engages with an engaging portion 21b provided on a side surface of the gear 21, and a second arm extending upward. The portion 22c is in contact with the upper wall portion of the second support member 17, and the gear 21 is urged to rotate forward via the engaging portion 21b (see FIG. 4).

  The first one-way clutch 23a is formed in a cylindrical shape having an inner ring and an outer ring, and the distal end portion of the left drive shaft 14a is inserted into the inner ring. Then, reverse rotation of the left drive shaft 14a (reverse rotation in which the left rear wheel 14 advances backward) is restricted, and forward rotation of the left drive shaft 14a (advance rotation in which the left rear wheel 14 advances forward) is permitted.

  The second one-way clutch 23b is formed in a cylindrical shape having an inner ring and an outer ring, and the distal end portion of the right drive shaft 15a is inserted into the inner ring. The reverse rotation of the right drive shaft 15a (the reverse rotation in which the right rear wheel 15 advances backward) is restricted, and the forward rotation of the right drive shaft 15a (the forward rotation in which the right rear wheel 15 advances forward) is permitted.

  The first pinion 24a rotates together with the first one-way clutch 23a by fitting the outer ring of the first one-way clutch 23a into the shaft hole. Therefore, when the first pinion 24a rotates forward (forward rotation), the left drive shaft 14a rotates forward due to the action of the first one-way clutch 23a, and when the first pinion 24a rotates backward (reverse rotation), the action of the first one-way clutch 23a. As a result, the left drive shaft 14a does not rotate backward (reverse rotation due to frictional resistance between the left drive shaft 14a and the first one-way clutch 23a occurs).

  In the second pinion 24b, the outer ring of the second one-way clutch 23b is fitted into the shaft hole and rotates together with the second one-way clutch 23b. Therefore, when the second pinion 24b rotates forward (forward rotation), the right drive shaft 15a rotates forward by the action of the second one-way clutch 23b, and when the second pinion 24b rotates backward (reverse rotation), the action of the second one-way clutch 23b. As a result, the right drive shaft 15a does not rotate backward (reverse rotation due to frictional resistance between the right drive shaft 15a and the second one-way clutch 23b occurs).

  The brake mechanism unit 6 is transmitted by the brake operation unit 30 for an operator to perform a braking operation by hand, a transmission member 31 for transmitting a braking force according to the operation of the brake operation unit, and the transmission member 31. A brake piece 32 for braking the left rear wheel 14 and the right rear wheel 15 by a braking force, and a compression spring 33 for urging the brake piece 32 to a non-braking state are provided.

  The brake operation unit 30 includes a brake base 34 fixed to the operation handle 3, a non-operation state (initial position) that is supported by the brake base 34 and is not operated by an operator, and an operation state in which the operator operates the front side. A brake lever 35 for converting to an (operation position) and a lock member 36 for locking the brake lever 35 in an operated state are provided.

  The transmission member 31 has one end connected to the brake lever 35 via a connecting fitting and the other end connected to the brake piece 32 via a connecting fitting 37 and an outer tube 39 covering the inner wire. And an adjusting bolt 40 for adjusting the play of the brake lever 35 when the inner wire 38 extends.

  The inner wire 38 is connected to the brake piece 32 via a coupling fitting 37 while passing through the inside of an adjustment bolt 40 screwed into the screw hole 17j of the wire bracket 17i protruding from the left side wall 17a of the second support member 17. Is done.

  The outer tube 39 is in contact with the brake base 34 at the end on the brake lever 35 side, and the end on the brake piece 32 side is inserted into the cylindrical receiving portion 40a of the adjusting bolt 40 (see FIG. 5). Therefore, by rotating the adjustment bolt 40, the pushing force of the outer tube 39 against the brake base 34 can be varied, and thereby the play of the brake lever 35 can be adjusted.

  The brake piece 32 is a plate material formed in a lateral width that can contact both the left rear wheel 14 and the right rear wheel 15, and is slidable in the front-rear direction by being inserted through the slide openings 16g and 16h described above. Supported by In addition, an inner wire 38 is connected to the central portion in the left-right direction, and comes into contact with the left rear wheel 14 and the right rear wheel 15 when the inner wire 38 is pulled backward in accordance with the operation of the brake lever 35. Yes.

  The compression spring 33 is provided between the wire bracket 17 i and the brake piece 32 in a state where the inner wire 38 is passed through the inside. Then, by urging (pressing) the brake piece 32 forward, the brake piece 32 is separated from the left rear wheel 14 and the right rear wheel 15 and the inner wire 38 is pulled forward via the brake piece 32. Thus, the brake lever 35 is returned to the initial position.

(Assist operation by the assist mechanism)
Next, an assist operation by the assist mechanism unit 5 will be described with reference to FIG. 4 is a cross-sectional view taken along the line XX in FIG. 3, but the brake mechanism 6 is omitted so that the assist operation of the assist mechanism 5 can be easily understood.

  As shown in FIG. 4A, when the operator does not step on the pedal member 20, the pedal member 20 is inclined upward by the urging force of the torsion spring 22, and the distal end side of the pedal portion 25 and the pedal support portions 26a and 26b is In the notch 2 a provided at the rear end of the loading platform 2, a state where the pedal portion 25 is disposed at the initial position is located on the right side of the center of the loading platform 2 in the left-right direction. In this state, since the gear 21 is separated from the first pinion 24a and the second pinion 24b and the meshing is released, the left rear wheel 14 and the right rear wheel 15 independently rotate forward or backward. Is possible.

  As shown in FIG. 4 (b), when the operator steps on the pedal portion 25 arranged at the initial position, the gear 21 starts reverse rotation via the pedal support portions 26a and 26b, and the gear 21 and the first pinion 24a and the 2nd pinion 24b will be in a meshing state. When the pedal unit 25 is further stepped down, the first pinion 24a and the second pinion 24b are rotated forward by the reversely rotating gear 21. Along with this, the left drive shaft 14a and the right drive shaft 15a rotate forward (forward rotation) by the action of the first one-way clutch 23a and the second one-way clutch 23b, and as a result, the left rear wheel 14 and the right rear wheel 15 rotate forward. The transport cart 1 moves forward.

  Specifically, the maximum rotation angle of the gear 21 due to the depression of the pedal portion 25 is set to about 70 °, and the speed increasing ratio of the gear 21 to the first pinion 24a and the second pinion 24b is set to about 5.5. Therefore, when the pedal portion 25 is stepped down (the ground GL), the 130π left rear wheel 14 and the right rear wheel 15 rotate forward more than one rotation.

  In a state where the pedal portion 25 is stepped on, forward rotation of the left drive shaft 14a and the right drive shaft 15a is allowed by the action of the first one-way clutch 23a and the second one-way clutch 23b. Therefore, even when the first pinion 24a and the second pinion 24b are not rotating, the forward rotation of the left drive shaft 14a and the right drive shaft 15a is not hindered, There will be no trouble.

  When the foot is released from the pedal portion 25, as shown in FIG. 4A, the gear 21 rotates forward by the urging force of the torsion spring 22, the pedal member 20 is inclined upward, and the pedal portion 25 returns to the initial position. To do. In this process, the forward rotation of the gear 21 causes the first pinion 24a and the second pinion 24b to rotate in reverse, and this rotational force is caused by the action of the first one-way clutch 23a and the second one-way clutch 23b and the left drive shaft 14a and the right It is not transmitted to the drive shaft 15a, and the left rear wheel 14 and the right rear wheel 15 do not rotate backward.

  As described above, since the assist mechanism unit 5 that rotates the left rear wheel 14 and the right rear wheel 15 forward by the depression force of the pedal unit 25 is provided, the start assist can be easily performed with respect to the start resistance that is loaded more than the running resistance. It is possible to improve the operability and workability of the transport carriage 1.

  Further, the left drive shaft 14a (left rear wheel 14) and the right drive are driven by the gear 21 that the assist mechanism unit 5 rotates by the depression force of the pedal unit 25 and the first pinion 24a and the second pinion 24b that mesh with the gear 21. Since the shaft 15a (the right rear wheel 15) is rotated forward, it is possible to improve the assist efficiency by the assist mechanism unit 5 and perform sufficient start assist. In addition, the assist mechanism unit 5 can be configured with a simple structure (small number of parts, light weight), and the cost can be reduced.

  Further, when the pedal portion 25 is not stepped on, the gear 21 is separated from the first pinion 24a and the second pinion 24b and the engagement is released, so the left drive shaft 14a (left rear wheel 14) and the right The drive shaft 15a (the right rear wheel 15) can rotate forward or backward independently, and the transport cart 1 can be freely turned right and left.

  Further, in a state where the pedal portion 25 is not stepped on, the pedal portion 25 and the pedal support portions 26a and 26b are in front of the notch portion 2a provided at the rear end portion of the loading platform 2, so that the pedal portion 25 Therefore, it is possible to suppress inconvenience such as hitting an operator's foot and causing injury.

  Further, when the pedal portion 25 is not stepped on, the pedal portion 25 is disposed on the right side of the center in the left-right direction of the loading platform 2, so that the operator can easily step on the pedal portion 25 with the right foot and assist. The operability of the mechanism unit 5 can be improved.

  Since the first pinion 24a and the second pinion 24b are attached to the left drive shaft 14a and the right drive shaft 15a via the first one-way clutch 23a and the second one-way clutch 23b, the gear 21, the first pinion 24a, Even when the second pinion 24b is engaged with the second pinion 24b (during the depression of the pedal unit 25 and the return of the pedal unit 25 to the initial position), the left drive shaft 14a (the left rear wheel 14) and the right drive shaft 15a (the right rear wheel 15) can be rotated forward, and the operability and workability of the transport carriage 1 can be prevented from being lowered.

  Further, since the diameter and the number of teeth of the gear 21 are set to values larger than those of the first pinion 24a and the second pinion 24b, start assist for a long distance is performed by depressing the pedal portion 25 once according to the speed increasing ratio. Therefore, it is possible to prevent the operability and workability of the transport carriage 1 from being deteriorated.

(Brake operation by the brake mechanism)
Next, the brake operation by the brake mechanism unit 6 will be described with reference to FIG. 5 is a YY cross-sectional view in FIG.

  As shown in FIG. 5A, when the operator does not operate the brake lever 35, the brake piece 32 slides forward by the urging force of the compression spring 33, and accordingly, the inner wire 38 is connected to the brake piece 32. The brake lever 35 is placed in the initial position by being pulled to the side. In this state, since the brake piece 32 is separated from the left rear wheel 14 and the right rear wheel 15, the left rear wheel 14 and the right rear wheel 15 can be rotated forward or backward.

  As shown in FIG. 5B, when the operator operates the brake lever 35 disposed at the initial position on the near side, the inner wire 38 is pulled toward the brake lever 35 against the biasing force of the compression spring 33, Along with this, the brake piece 32 is pulled rearward and comes into contact with the left rear wheel 14 and the right rear wheel 15. Therefore, forward rotation or reverse rotation of the left rear wheel 14 and the right rear wheel 15 is restricted (braking), and the brake mechanism unit 6 functions as a braking brake.

  When the lock member 36 is operated in this state, the brake lever 35 is locked in the operated state, and the brake piece 32 is kept in contact with the left rear wheel 14 and the right rear wheel 15. Therefore, forward rotation or reverse rotation of the left rear wheel 14 and the right rear wheel 15 is restricted (braking), and the brake mechanism unit 6 functions as a parking brake. The lock member 36 is released from the locked state when the brake lever 35 is lightly operated, and the brake lever 35 returns to the initial position.

  As described above, since the brake mechanism unit 6 that restricts (brakes) the rotation of the left rear wheel 14 and the right rear wheel 15 is provided, it is possible to prevent the transport carriage 1 from running away toward the valley on a downward slope. Is possible.

  In addition, since the lock member 36 that locks the brake lever 35 in the operating state is provided, the transport cart 1 can be prevented from moving freely due to the tilt when the transport cart 1 is used on an inclined ground. The workability of the carriage 1 can be improved.

  In the embodiment of the present invention, the lock member 36 that locks the brake lever 35 in the operating state is provided in the embodiment of the present invention, but the lock member 36 may not be provided. Further, although the brake mechanism unit 6 that restricts (brakes) the rotation of the left rear wheel 14 and the right rear wheel 15 is provided, the brake mechanism unit 6 may not be provided.

  In addition, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is indicated not by the above description but by the scope of the utility model registration request, and is intended to include all modifications within the meaning and scope equivalent to the scope of the utility model registration request.

DESCRIPTION OF SYMBOLS 1 Carriage 2 Carrying platform 3 Operation handle 4 Wheel 5 Assist mechanism part 6 Brake mechanism part 10 Front wheel support part 11 Front left wheel 12 Right front wheel 13 Rear wheel support part 14 Left rear wheel 15 Right rear wheel 20 Pedal member 21 Gear 22 Torsion spring 23a 1st one-way clutch 23b 2nd one-way clutch 24a 1st pinion 24b 2nd pinion 30 Brake operation part 31 Transmission member 32 Brake piece 33 Compression spring

Claims (3)

A loading platform that moves by the rotation of wheels,
An operation handle provided on the rear end side of the loading platform;
In the transport carriage having an assist mechanism portion that drives the wheel forward by a stepping force of a pedal portion facing the rear side of the loading platform,
The wheel is
A left universal wheel and a right universal wheel provided on the front side of the cargo bed,
A left fixed wheel and a right fixed wheel provided on the rear side of the cargo bed,
The assist mechanism is
A gear that reversely rotates in response to the depression force of the pedal part;
A biasing member for rotating the gear forward to return the pedal portion to an initial position;
A first pinion that is attached to the drive shaft of the left fixed wheel via a first one-way clutch and that rotates forward in response to the reverse rotation of the gear in a meshed state;
A second pinion that is attached to the drive shaft of the right fixed wheel via a second one-way clutch and that rotates forward in response to the reverse rotation of the gear in a meshed state;
The first one-way clutch allows forward rotation of the drive shaft of the left fixed wheel but restricts reverse rotation, and when the first pinion rotates forward, the drive shaft of the left fixed wheel is rotated forward,
The second one-way clutch allows forward rotation of the drive shaft of the right fixed wheel, but restricts reverse rotation.When the second pinion rotates forward, the drive shaft of the right fixed wheel is rotated forward,
When the pedal portion returns to the initial position, the gear and the first pinion and the second pinion are disengaged from each other. The operation handle is
A pair of struts erected from the left and right end sides of the rear end side of the cargo bed,
A gripping part that spans between the pair of struts,
At the rear end of the loading platform,
2. The transport carriage according to claim 1, wherein a notch portion is provided between the pair of support columns from a rear end portion to a front end portion of the cargo bed. A brake mechanism for braking rotation of the left fixed wheel and the right fixed wheel;
The brake mechanism is
A brake operation unit provided on the operation handle;
A transmission member for transmitting a braking force according to the operation of the brake operation unit;
A brake piece for braking the left fixed wheel and the right fixed wheel by the braking force transmitted by the transmission member,
The brake operation unit is
A brake lever that converts between a non-operating state and an operating state;
The transport carriage according to claim 1, further comprising: a lock member that locks the brake lever in an operating state.