JPH1178902A - Cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily move even in a step where a wheel can not be rotated in a cart carrying a plate-shaped article like a tatami. SOLUTION: This cart 1 has a pluraling of wheels placed in front and rear positions underneath a loading space 2. In the cart 1, first wheels 4, 4 and second wheels 5, 5 are placed with a given interval on the front side, rear wheels 6, 6 are placed on the rear side, and a guide part 13 is formed between the second wheels 5, 5 and the rear wheel 6, 6 in such a way that when the second wheels 5, 5 on ahead side of a moving direction come up the step part B and reach to an upper transferring surface C, the guide part 13 touches the step part B to push up the cart1, than lowers the level difference between the rear wheels 6, 6 touching on the transferring surface C and the transferring surface C to smoothen the rear wheels 6, 6 to move onto the transferring surface C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trolley used for carrying luggage, and more particularly to a trolley capable of carrying a plate-like object such as a fold even at a step.

[0002]

2. Description of the Related Art There are carts for carrying tatami mats as shown in FIG. The trolley 101 has a structure in which a backrest 103 is erected on a loading platform 102 having an inclined mounting surface. It can be transported to That is, the backrest portion 103 is formed along the front-rear direction, and the two wheels 106, 10 pass through one axle 105 at the middle portion in the front-rear direction on the lower surface of the carrier 102.
6 and small auxiliary wheels 107 are provided on both front and rear sides. The tatami mat 104 placed on the bed 102
Is supported by the wheels 106, and the rotation of the wheels facilitates the movement. For this reason, it is difficult to move at a place where the wheels do not rotate, for example, at a stepped portion of the floor surface which is common in recent apartments and the like.

[0003] That is, when the step is small (smaller than the radius of the wheel), it is possible to push over the step by force, but when the step is large (greater than the radius of the wheel). In this case, the wheel does not rotate only by pushing with force, but must be lifted until the wheel gets over a step or a position where rotation is possible. However, even if it is simply lifted, the weight of the tatami mats is all in the hands of lifting, so it is almost impossible to lift a trolley carrying six tatami mats, each weighing 40 kg. In the end, people had to carry tatami mats one by one in places where there was no step on the trolley.

[0004] Also, if the step is forcibly pushed over the step just because the step is small, the backrest is formed along the front-back direction. In some cases, the tatami mats were not supported by the backrest, and the tatami mats fell off.

[0005] Furthermore, since the tatami mats are merely rested on the backrests on the loading platform, when the tatami mats are loaded vertically and loaded with a high center of gravity, the force in the direction in which the tatami falls down can be easily applied. There was also a difficulty that it was difficult.

Further, in the bogie described in the prior art, although a lock mechanism for pressing the wheel and stopping its rotation is formed in order to prevent unexpected movement, there is no structure for adjusting the pressing strength. For this reason, the lock may become loose or too tight due to a manufacturing error, and handling of the truck may be inconvenient.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a bogie which can be easily moved even in a place having a step, can stably load a plate-like mounted object, and is easy to handle. Make it an issue.

The means for this purpose is a truck having wheels arranged at front and rear positions on the lower surface of the loading platform, and between each of the front and rear wheels, when or at the time when the front wheel in the traveling direction moves over the step to the transition surface. When the vehicle comes into contact with the stepped portion when the vehicle is in contact with the transition surface, the height difference between the wheel and the transition surface is made smaller than the step, and the bogie is formed with a guide portion that facilitates the transfer of wheels.

The guide portion may be formed by extending a bar-shaped member back and forth so that the rear portion is lowered, and the lower surface of the rear portion may be set to be lower than the shaft of the rear wheel.

[0010] The front wheels of the wheels are formed by first and second wheels arranged in front and rear, and between the first and second wheels, a front wheel in the traveling direction is provided. When one wheel moves to a high transition surface over the step, an interval may be formed in which the lower side of the axis of the second wheel contacts the step.

Further, it is preferable that an auxiliary wheel is provided at the rear end of the loading platform to be in contact with the ground when the rear side of the loading platform is inclined downward by a predetermined angle.

A support frame for supporting the plate-like object in an upright state is pivotably attached to the rear end of the carrier so as to be able to stand upright and tiltable, and is opened to one side of the support frame with respect to the support frame. A backrest frame that is sometimes perpendicular to the support frame and holds the plate-like mounted object in an upright state may be pivotally openably and closably mounted, and further, the backrest frame of the plate-shaped mounted object loaded on the support frame or the carrier. It is preferable to form a restricting means for preventing tilting to the side.

[0013]

According to the above construction, when the bogie climbs a step, the rear side in the traveling direction is lowered and the front side is raised, and the front wheel in the traveling direction is moved over the stepped portion to the transition surface. Then, by contacting the guide portion with the step portion and pushing the bogie in the traveling direction, the wheel on the rear side in the traveling direction approaches the step portion, and the height difference between the wheel and the transition surface on the step portion is smaller than the step. Make it smaller. Thereafter, the entire carriage can be moved to the transition surface by further pushing. When lowering the step, the bogie is retracted and the above operation is performed in reverse.In addition, the wheel on the front side in the traveling direction is lowered from the upper surface of the step, and the guide section contacts the step, and the wheel and the step The height difference between the wheel and the lower transition surface is smaller than the step, so that the operation when the wheel moves to the transition surface is smooth.

[0014] As described above, since the transition of the wheels becomes smooth, it is easy to go up or down the step. As a result, it is possible to carry a plate-like mounted object such as a tatami mat without any trouble as in the related art.

Also, when the guide portion is formed by bridging a rod-like member and the height of the lower surface of the rear portion is set lower than the axis of the rear wheel, the guide portion may be formed when the vehicle goes over a step. It is easy to put the rear wheel on the transition surface in the last operation of the above. In other words, simply slide the guide on the step to bring the rear wheel closer to the step, and then press it continuously, so that the surface of the wheel below the shaft hits the step and the wheel rotates easily. I do. For this reason, it is easy to get on.

According to a third aspect of the present invention, when the front wheels are formed by the first wheel and the second wheel and a predetermined interval is formed between them, when going up a step, each wheel is sequentially placed on the transition surface. Since the transfer is performed, the burden on the work can be reduced unlike the case where the transfer is performed at once. Further, when the rear wheel is shifted to the transition surface, the first wheel and the second wheel stably travel on the transition surface, so that the operation can be performed with good stability.

In the case where the auxiliary wheels are mounted on the rear end of the loading platform as described in claim 4, even if the vehicle is tilted too much when raising the front side in the traveling direction, the auxiliary wheels contact the ground and can be prevented from falling down. Also, when carrying the cart by folding it,
By pulling while holding the front side of the bogie, light movement by the auxiliary wheels becomes possible. Although depending on the height of the step, the auxiliary wheel abuts on the step when descending the step, so that the operation when the rear wheel shifts to the transition surface can be smooth.

When the supporting frame is pivotally attached to the rear end of the loading platform so as to be capable of standing and tilting, and the backrest frame is pivotally attached to one side of the supporting frame, the plate-like mounted object is large. Place one side on the backrest frame and one side on the support frame. At this time, since the other side of the support frame is open without a backrest frame, the support frame has an L-shape in plan view, and loading of the plate-shaped object is easy. Further, since the support frame for supporting the plate-like mounted object is mounted on the rear end of the carrier, the operation can be easily performed by holding the support frame when raising the front side of the carrier. Further, since the plate-like mounted object is supported by the support frame, it does not shift or drop.

In the case where the regulating means is formed as described in claim 6, even if the number of plate-like objects to be placed is smaller than the predetermined number, the regulating member does not tilt to the side of the backrest frame. Since the obstruction and the leaning state are maintained, a stable mounting state of the plate-like mounted object is obtained, and the handling is easy.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a carriage 1 suitable for carrying a tatami A. As shown in this figure, the cart 1 is formed in an L-shape in a side view in which a support frame 3 is pivotally attached to the rear end of the carrier 2 so as to be able to stand up and tilt. Is placed along the support frame 3. Four front wheels (first wheels 4, 4 and second wheels 5, 5) are located on the lower surface of the loading platform 2.
And two rear wheels 6,6.

The basic structure of the loading platform 2 is as shown in a perspective view in FIG. 2, and the left and right portions on the upper surface side of the base frame 7 having a substantially U shape are elongated in the front-rear direction. The prismatic vertical connecting members 8 are provided. Then, the first mounting plates 9 and 9 and the second mounting plates 10 and 10 are fixed to a front end portion between the vertical connecting members 8 and 8 and the base frame 7 and a portion behind by a predetermined distance therefrom. The first wheels 4 and 4 and the second wheels 5 and 5 which can swing freely are mounted on the lower surface thereof. The wheels mounted on the first mounting plates 9, 9 are first wheels 4, 4, and the wheels mounted on the second mounting plates 10, 10 are second wheels 5, 5. The predetermined distance is such that when the first wheels 4, 4 on the front side in the traveling direction move to a high transition surface beyond the step, the lower side than the axis of the second wheels 5, 5 abuts on the step. Distance.

The lower surface of the vertical connecting member 8 includes
At the front portion corresponding to between the mounting plate 9 and the second mounting plate 10 and at the rear position on the rear side of the loading platform 2, horizontal connecting members 11, 12 having a wide U-shaped cross section are mounted. The upper surfaces of the lateral connection members 11 and 12 support the lower end surface of the tatami mat A.

Further, a position on the lower surface of the vertical connecting member 8 behind the second mounting plate 10 and the horizontal connecting member 1 on the rear side.
A guide member 13 is formed by hanging a rectangular rod-shaped member vertically between the front and rear members. This guide portion 13 is lowered at the rear side, and the height of the lower surface is
The shaft 6a of the rear wheel 6 attached near the rear lateral connecting member 12
It is set so that it is located below the height of. A smooth surface layer 13a is formed on the lower surface of the guide portion 13 by baking ethylene tetrafluoride resin, so that frictional resistance between the guide portion 13 and another member (a step portion) is reduced so that sliding is good. In addition, for example, a number of rotating rollers may be mounted on the lower surface of the guide portion 13, or the guide portion 13 may be formed of a round bar-shaped member.

On the left and right sides of the rear end of the loading platform 2, mounting portions 14, 14 having a U-shape in plan view are formed, and the auxiliary wheels 15, which contact the ground when the rear side of the loading platform 2 is inclined downward by a predetermined angle. Fifteen
Is rotatably held only in the front-rear direction. A U-shaped pivot recess 16 having an open upper surface for pivotally attaching the support frame 3 is formed at an inner position between the two mounting portions 14.

A plurality of first regulating members 17 for preventing the lateral displacement of the tatami mat A to be placed are formed at predetermined intervals on the front side of the loading platform 2 having such a basic structure. . Since the carriage 1 can carry up to six tatami mats A, five first regulating members 17 are formed. That is, as shown in FIG. 3, the first restricting member 17 is a member in which a round bar-shaped undulating member 17a having a substantially “H” shape is attached to the outer peripheral surface of a cylindrical rotating body 17b. The shaft member 18 is inserted so as to rotate on a shaft member 18 horizontally laid on the lower side between the eight members so that the shaft member 18 can be raised and lowered. Then, the first regulating member 17 is controlled by the spring 19 so that the first regulating member 17 maintains the state where the first regulating member 17 is normally raised.
Is biased by pulling its lower end. In a state where the first regulating member 17 is raised, the distal end side protrudes above the upper surfaces of the horizontal connecting members 11 and 12. The other end of the spring 19 may be fixed to the connecting portion 20 that connects the left and right guide portions 13 to each other.

The two rear wheels 6, 6 which are rotatably mounted in the front-rear direction only in the vicinity of the rear lateral connecting member 12, include:
The lock mechanism 21 is mounted. As shown in FIGS. 4 and 5, the lock mechanism 21 includes a stopper member 22 that contacts the peripheral surface of the rear wheel 6, and a pressing unit 23 that presses the stopper member 22 toward the rear wheel 6 by leverage. The distance from the fulcrum of the pressing means 23 to the point of action is formed so as to be changeable. That is, the upper part of the stopper member 22 is rotatably held in the front-rear direction between the vertical connecting member 8 and the base frame 7,
A pressing roller 23a as an action point is brought into contact with the surface of the stopper member 22 on the side opposite to the rear wheel 6. The pressing roller 23a has a shaft 23 at one end of a thin plate-like arm member 23b.
c is projected and rotatably held on the shaft 23c.
The arm member 23b has a long groove 23 along the length direction.
The operating lever 23e having a substantially Z-shaped bent end is inserted into the long groove 23d. Operation lever 2
3e is held on a thin plate-like fixing plate 23f, and a screw portion 23g erected from a plate surface on one end side of the fixing plate 23f is
The nut 23h is screwed together with the screw 23g through the long groove 23d together with the operation lever 23e and tightened, and the positional relationship between the arm member 23b and the fixing plate 23f is appropriately set.
The lock mechanism 21 is formed on each of the two left and right rear wheels 6 and 6, and the operation levers 23e are connected to each other so that both lock mechanisms 21 and 21 are operated by one operation.

The support frame 3 includes a support frame main body 31 and a retractable member 32. The support frame main body 31 is provided with a U-shaped plate member 34 at the upper part of two parallel hollow pipes 33, 33. In addition, a reinforcement member 35 is laid over the lower side and a backrest frame 36 is pivotally mounted on one upper side. The retractable member 32 is provided with two rod members 37, 37 which can be inserted into the hollow pipe 33, at the upper ends of the rod members 37, 37.
It is a structure connected by. The withdrawal member 32 is supported by the support frame body 3
It is only necessary to be able to be fixed at two positions, that is, the position where it is housed in 1 and the position where it is taken out of the support frame main body 31. Insertion holes 33a, 37 at two positions
a, 37b. The fixing is performed by a fixing member 39 having an insertion portion 39a that can be inserted when these insertion holes (33a and 37a or 33a and 37b) overlap. This fixing member 39 is, for example, as shown in FIG.
Pin 39c having an insertion portion at the center of disc-shaped magnet 39b
It is good to constitute by attaching. Due to the attraction force of the magnet 39b, the insertion portion 39a inserts the insertion holes (33a and 37a or 33a).
a and 37b) can be kept in a pierced state.

The one side of the support frame body 31, that is, one of the hollow pipes 33 holds the upright body of the tatami A at right angles to the support frame 3 when opened with respect to the support frame 3. The backrest frame 36 is pivotally attached so as to be openable and closable. The backrest frame 36 has a U-shape in a front view, and has both ends pivotally connected to each other.
6a, and a connecting piece 36b having an L-shaped cross section is attached to the lower portion on the free end side at an angle. The connecting piece 36b is used to hold the support frame 3 in an upright state. The connecting piece 36b connects the distal end portion 40a of the first support arm 40 pivotally attached to one side of the front portion of the loading platform 2 to form the support frame 3 It stops so that it may be held at right angles to the bed 2. As shown in FIG. 7, the two insertion holes 36 are formed in the connecting piece 36b.
c, 36c, and the distal end 40 of the first support arm 40
On the lower surface of a, two projections 40b, 40b to be inserted into these insertion holes 36c, 36c are formed.

For the same purpose, a second support arm 41 is provided on the other side of the support frame main body 31, that is, on the other hollow pipe 33.
The insertion groove 41a cut from below is formed at the tip of the second support arm 41, and the insertion groove 41a is provided to protrude from the side surface of the corresponding vertical connecting member 8 in a locking manner. The support frame 3 is retained at a right angle to the carrier 2 by engaging with the projection 42.

Further, the plate member 34 of the support frame main body 31 is provided.
A plurality of second regulating members 43... Are mounted at predetermined intervals inside. Like the first regulating members 17, the second regulating members 43 prevent the loaded tatami A from tilting to the side of the backrest frame 36, and can be raised and lowered from the plate surface of the plate member 34. The second regulating members 43 are in the form of a slightly thick elongated plate, the lower end of which is pivotally supported by a transverse member 44 suspended between the hollow pipes 33, 33, and the plate surface of the plate member 34 is Biased away from When viewed from the side, the tatami mat A comes into a state of protruding inward as if drawing a letter “R”, and is pushed in the direction of the plate member 34 to be in the second position.
The regulating member 43 is in a state along the plate member 34. The amount of inward projection is set so that the tatami mat A to be loaded is sufficiently locked.

In the drawing, reference numeral 51 denotes a first band locking portion, and 52 denotes a second band locking portion.
The band locking portion locks the end of the binding band 53. The binding band 53 has one end formed in an annular shape so that the first band locking portion 51 and the second band locking portion 52 are formed.
It is easy to lock on.

The cart 1 constructed as described above can be folded and compacted or assembled by moving each part as indicated by arrows in FIG.
In folding, the retractable member 32 of the support frame 3 is housed in the support frame main body 31, and the first support arm 40 is detached from the back frame 36 and lowered. Then, as shown in FIG. 8, after that, the second support arm 41 is
, The front end side is extended to the front side of the loading platform 2, the support frame 2 is folded down and overlaid on the loading platform 2, and then the first band locking portion 51 and the second band locking portion are widened using the wide binding band 53. 52 and the folding state may be fixed. When assembling, the above operation is reversed. It is preferable that the length of one end of the operation lever 23e of the lock mechanism 21 bent in the Z-shape does not protrude from the upper surface (support frame 3) when the carriage 1 is folded. This is because it can be placed upside down (with the support frame 3 down) and handling becomes convenient.

FIGS. 10 and 11 are perspective views showing a state where the tatami mat A is loaded. FIG. 10 shows a state in which six prescribed tatami mats A are stacked, and FIG. 11 shows a state in which three tatami mats A which do not satisfy the prescribed rules are stacked. The tatami mat A is loaded from the side without the backrest frame 36 with the tatami mat A in a portrait orientation. Since there is only the second support arm 41 on the side without the backrest frame 36, the loading operation can be easily performed. In addition, since the tatami mat A is loaded vertically, it can be carried using an elevator. Moreover, although the rear wheel 6 only rotates in the front-rear direction, since the first wheel 4 and the second wheel 5 can swing, it is possible to rotate 360 degrees on the spot. This can further promote the convenience of transportation using the device.

After the tatami mat A is loaded, the binding band 53 may be provided between the first band engaging portion 51 and the second band engaging portion 52, and the tatami mat A may be fixed so as not to move. When the number of tatami mats less than the specified value as shown in FIG. 11 is loaded, the first restricting member 17 and the second restricting member 43 where the tatami mat A is not placed are raised, and the tatami mat A is turned upside down. It is prevented from falling or shifting to the side of the backrest frame 36, and the fixing by the binding band 53 is firmly performed.
A stable placement state of the tatami mat A is obtained, and handling is easy.

When the carriage 1 climbs a step, the situation is as shown in FIGS. That is, the support frame 3 side, which is the rear side in the traveling direction, is lowered, and the front side of the carrier 2 is raised. Since the center of gravity of the vertically stacked tatami mat A is high, the tilting operation can be easily performed. Also, even if the vehicle is tilted too much,
5, 15 are grounded to prevent falling. Further, since the support frame 3 for supporting the tatami A is attached to the rear end of the loading platform 2, the operation can be easily performed by holding the supporting frame 3 when raising the front side of the loading platform 2, and the tatami A is supported by the supporting frame. Because it is supported by 3, it does not slip or fall. After this state, the first wheels 4, 4 are moved over the step B to the transition surface C (see FIG. 12).

Subsequently, the carriage 1 is pushed forward. The second wheels 5, 5 whose lower side than the shaft is in contact with the stepped portion B easily rotate with a small force and ride on the transition surface C (see FIG. 13). The operation of pushing the bogie 1 is easy, and each wheel (the first wheels 4, 4 and the second wheels 5, 5) sequentially moves to the transition surface. Can be reduced.

By further pushing forward, the second wheels 5, 5 and the rear wheels 6, 6 rotate and move forward, and the guide portions 13,
13 is brought into contact with the step B (see FIG. 14). By further pushing the carriage 1 in the traveling direction, the guides 13 and 13 slide on the step B, and the carriage 1 moves forward. As a result, the rear wheels 6, 6 approach the step, and the rear wheels 6, 6
The height difference between the rear wheel 6 and the transition surface C above the step portion B is smaller than the step, and further smaller than the radius dimension of the rear wheels 6 and 6. As a result, the surface below the axis of the rear wheels 6 and 6 hits the stepped portion B, and the rear wheel 6 can be easily rotated only by pushing, and can easily ride. After that, if it is further pushed, the entire carriage 1 can be moved to the transition surface C (see FIG. 15). At this time, since the first wheels 4, 4 and the second wheels 5, 5 run on the transition surface C stably, the operation of pushing the cart 1 can be performed with good stability.

When the carriage 1 is lowered from the step B, the carriage 1 is retracted to perform the operation opposite to the above-mentioned operation (see the phantom line in FIG. 15). The two wheels 5, 5 are lowered from the upper surface of the step B, and the guides 13, 13 abut on the step B, and the first wheels 4, 4
When the height difference between the second wheels 5, 5 and the transition surface D below the step B is smaller than the step, the first wheels 4, 4 and the second wheels 5, 5 transition to the transition surface D. To make the operation smooth. Although depending on the height of the step, the auxiliary wheels 15, 15 contact the step B when descending the step, thereby smoothing the operation when the rear wheels 6, 6 shift to the transition surface D. be able to.

When the carriage 1 in the folded state is carried, the carriage 1 may be held by hand, but if the carriage 1 is pulled while holding the front side as shown in FIG. Becomes

As described above, the wheels 4, 4, 5, 5, 6, 6
This makes it easy to move up and down steps. As a result, the tatami mat can be easily transported without any trouble as in the related art.

A lock mechanism 2 provided on the rear wheels 6 and 6 is provided.
Since the distance between the fulcrum and the point of action of the first pressing means 23 can be changed, the lock mechanism 21 can be prevented from being too tight or too loose due to a manufacturing error. Depending on the type of the plate-like mounted object and the situation of the place of use, it can be appropriately set so as to be easily used.

FIGS. 17 to 20 show a truck 1 according to another embodiment. In the truck 1, the number of parts is reduced to simplify the configuration. That is, similarly to the previous embodiment, the carriage 1 includes the carrier 2, the support frame 3, and the first wheels 4
, The second wheel 5, the rear wheel 6, the guide portion 13, the auxiliary wheel 15, and the backrest frame 36, but mainly for the configuration of the carrier 2 and for holding the support frame 3 in the upright state. The configuration and the configuration of the regulating means are simplified.

The loading platform 2 is formed by bridging three horizontal connecting members 61, 62, 63 on a base frame 7 formed by rolling a square pipe in a U-shape. A plurality of square pipes 64 are vertically mounted on and fixed to 62 and 63 so as to form a square shape to form a first restricting portion 65.
A tatami mat A is erected between the square pipes 64 to prevent lateral displacement. Since the carriage 1 is capable of placing six tatami mats A in the same manner as the previous embodiment, the square pipe is
The book is fixed. In forming the first restricting portion 65, the rear is inclined slightly downward. This is preferable because the tatami mat does not fall forward when the tatami mat A is placed thereon, which is convenient when descending the step, and is easy to tilt backward when climbing the step. .

The backrest frame 36 pivotally attached to one side of the support frame 3 is formed at the same height as the support frame 3, and when opened, forms a right angle with the outer surface on the pivot side when opened. The bottom surface is brought into surface contact with the opposing surfaces of the support frame 3 and the base frame 7, respectively.

Further, the support frame main body 3 constituting the support frame 3
1 is formed in a gate shape, a round bar member 66 is laid over the inside of the gate member, and a thick strip-shaped regulating member 67 is slidably inserted into and held by the round bar member 66. 2
A regulating portion 68 is formed. At the base of the regulating member 67, a wing bolt 69 whose tip is pressed against the round bar member 66 is held. In use, the wing A is slid to an appropriate position for holding the placed tatami mat A, and then substantially horizontally. And tighten the wing bolt 69 to maintain that state.

Incidentally, on both sides of the support frame main body 31,
A handle is attached for convenience of operation 70. For mounting, the holding pipes 71, 71 are fixed to both side surfaces of the support frame main body 31, and inside these holding pipes 71, 71,
An L-shaped handle 70 with a grip 70a attached to one end
Should be inserted. It is preferable to adopt a configuration in which the inserted state is held by, for example, a wing bolt 72.

Further, two T-shaped T-shaped locks for locking a binding band (not shown) that presses the stacked tatami mat A are provided on the upper portion inside the retracting member 32 inserted into the support frame main body 31. The band locking portions 32a, 32a are formed. Since the vertically stacked tatami mats A are vertically elongated, it is convenient to lock the binding band at the upper portion, since a stronger binding state can be obtained. The positional relationship between the retractable member 32 and the support frame main body 31 is also set by the wing bolt 73.

Further, as shown in FIG. 18, a vertically-long rectangular projecting piece 74 is formed on the side surface of the base frame 7 on the side of the backrest frame. The biased lock unit 75 is mounted. A locking projection 75b having a tapered surface on the distal end surface is provided on the distal end of the lock unit 75 in a state of being urged in the protruding direction.

The lock unit 75 is for holding the support frame 3 in a standing state and an inclined state. That is, at the lower end position on the outer surface front end side of the backrest frame 36, L
A first locking portion 76 having a letter shape is formed, and a second locking portion 77 having an L shape is also formed on the side surface of the support frame main body 31. The locking portions 76 and 77 are formed with holes 76a and 77a into which the locking projections 75b of the lock unit 75 are fitted. The projecting piece 74 and the second locking portion 77 also serve to prevent the backrest frame 36 from opening more than necessary.

In FIG. 18, the solid line indicates the upright state of the support frame 3. Since the front end of the locking projection 75b has a tapered surface, the support frame 3 is raised and the backrest frame 3 is raised.
6, the first locking portion 76 formed on the backrest frame 36 automatically engages with the locking projection 75 b of the lock unit 75. When removing, the lock of the lock unit 75 is released and the backrest frame 36 is closed. Similarly, support frame 3
When the player is to be tilted, it is only necessary to defeat it.

FIG. 19 shows the structure of the lock mechanism 21. The lock mechanism 21 also has a simplified configuration, and a long rod-shaped stopper member 78, which serves as a stopper whose both ends are pressed against the rear wheel 6, is provided via an operation arm 79 and a driven arm 80 pivotally attached to the base frame 7. While laying under the base frame 7,
Both ends of the stopper member 78 are fixed to one ends of the springs 81 and 81 to exert an urging force, so that the operation arm 79 has a moderate rotation operation.

FIG. 20 shows the folding process of the cart 1. In folding, the retractable member 32 is housed in the support frame main body 31, and the handle 70 is directed forward. Then, the backrest frame 36 is closed, the second support arm 41 is removed, and the support frame 3 is lowered. Then, since the tilted state of the support frame 3 is automatically held, the folded state of the cart 1 is held without performing work such as binding with a band.

FIG. 21 is an explanatory view showing another example of the second restricting portion 68. The second restricting portion 68 has a flat portion 66a on the upper portion of a round bar member 66 which is laid horizontally on the support frame main body 31. Are formed at predetermined intervals in the length direction to form a plurality of concave portions 66b which fall forward from the flat portions 66a. At the base of the regulating member 67, a round hole 6 in which a round bar member 66 can be rotated is provided.
7a, for example, as shown in FIG.
For example, a convex portion 67c that fits into the concave portion 66b is formed by screwing b. That is, the restricting member 67 slides on the round bar member 66 with the distal end thereof facing upward, and at a position where the concave portion 66 exists, the restricting member 67 is rotated forward and held in a horizontal state. You. Workability is good because it is not necessary to tighten with a butterfly bolt as in the previous example.

FIG. 22 shows another example of the structure for attaching the handle 70. At the lower end of the handle 70, two opposing cut grooves 70a, 70a are formed in the longitudinal direction, and a bar-shaped locking member 83 for holding the upper end of the spring 82 is mounted on the upper part thereof. doing. On the other hand, a rod-shaped locking member 84 for holding the lower end of the spring 82 is attached to the lower end of the holding pipe 71. Also in this case, the workability is good because it is not necessary to tighten with a butterfly bolt. Alternatively, the handle 70 may be rotatably held by 180 degrees, for example, by forming a groove in the circumferential direction. The effects of rising and falling steps are the same as those described in the previous embodiment, and a description thereof will be omitted.

The first wheel 4 and the second wheel 4 in the above-described embodiment are used.
The wheel 5 and the rear wheel 6 are the same as the wheels in the claims, except that the first regulating member 17, the second regulating member 43, the first regulating portion 65,
The second restricting portion 68 corresponds to the restricting means, and the tatami mat A corresponds to the plate-like mounted object.

[Brief description of the drawings]

FIG. 1 is a perspective view of a cart.

FIG. 2 is a perspective view of the basic structure of the carrier.

FIG. 3 is a cross-sectional view of the front side of the cargo bed.

FIG. 4 is a perspective view of a lock mechanism.

FIG. 5 is a side view of the lock mechanism.

FIG. 6 is a perspective view of a main part of the support frame.

FIG. 7 is a perspective view showing a part of the backrest frame.

FIG. 8 is a perspective view of a cart folding process.

FIG. 9 is a perspective view of the cart in a folded state.

FIG. 10 is a perspective view of a use state.

FIG. 11 is a perspective view of a use state.

FIG. 12 is an explanatory diagram of an operation state.

FIG. 13 is an explanatory diagram of an operation state.

FIG. 14 is an explanatory diagram of an operation state.

FIG. 15 is an explanatory diagram of an operation state.

FIG. 16 is an explanatory diagram of an operation state.

FIG. 17 is a perspective view of a truck according to another example.

FIG. 18 is a side view of the cart shown in FIG. 17;

FIG. 19 is a side view of the bogie locking mechanism of FIG. 17;

FIG. 20 is a perspective view showing a folding process of the cart shown in FIG. 17;

FIG. 21 is a structural explanatory view showing another example of the second regulating unit.

FIG. 22 is a perspective view showing another example of a handle portion.

FIG. 23 is a perspective view of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Dolly 2 ... Carrier 3 ... Support frame 4 ... 1st wheel 5 ... 2nd wheel 6 ... Rear wheel 13 ... Guide part 15 ... Auxiliary wheel 17 ... 1st regulating member 36 ... Backrest frame 43 ... 2nd regulating member 65 ... 1st regulation part 68 ... 2nd regulation part A ... tatami B ... stepped part C ... transition surface D ... transition surface

Claims (6)

[Claims] 1. A truck having wheels disposed at front and rear positions on a lower surface of a loading platform, wherein a step is provided between each of the front and rear wheels when a front wheel in a traveling direction moves over a step portion to a transition surface or when the wheel moves. A bogie having a guide portion that contacts a portion and makes a difference in height between a wheel contacting the transition surface and the transition surface smaller than a step, thereby facilitating transfer of wheels. 2. The guide portion is formed by extending a bar-shaped member back and forth so that the rear portion is lowered, and the height of the lower surface of the rear portion is set lower than the axis of the rear wheel. The trolley described. 3. A front wheel of said wheels is formed by a first wheel and a second wheel arranged in front and rear, and between said first wheel and said second wheel, a front wheel on the front side in the traveling direction is provided. The bogie according to claim 1 or 2, wherein when one wheel moves to a high transition surface beyond the step, a space below the shaft of the second wheel abuts on the step. 4. The truck according to claim 1, further comprising an auxiliary wheel attached to a rear end of the carrier, the auxiliary wheel contacting when the rear side of the carrier is inclined downward by a predetermined angle. 5. A support frame for supporting a plate-like object in an upright state is pivotably attached to a rear end of the loading platform so as to be able to stand up and tilt, and is opened to one side of the support frame with respect to the support frame. The bogie according to any one of claims 1 to 4, wherein a backrest frame which is sometimes perpendicular to the support frame and which holds the plate-like mounted object in an upright state is openably and closably mounted. 6. The bogie according to claim 5, wherein a restricting means for preventing the loaded plate-like mounted object from tilting to the side opposite to the backrest frame is formed on the support frame or the carrier.