JP2616581B2 - Transport trolley - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport trolley, and more particularly to a transport trolley for moving a loading platform up and down to place a heavy object placed on a sleeper or the like and transport it to a target position.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, when a cylinder rod 2 of a lifting device 1 to which a free wheel 5 is connected rises, a fulcrum 3a of a L-shaped arm 3 rises as shown in FIG. It turns in the direction of the arrow in the figure using the fulcrum 3a as a fulcrum. Then, the link bar 4 connected to the L-shaped arm 3 is pushed in the direction of the arrow, and the front wheel 6 moves in the direction of the arrow. Thereby, the bed 7 is lifted horizontally.

[0003] When a heavy object placed on a sleeper is transported using this transport trolley, first, the cylinder rod 2 of the lifting / lowering device 1 is contracted to rotate the L-shaped arm 3 in the opposite direction. To lower the bed 7 to a height that allows it to be inserted between the sleepers. At this time, the front wheel 6 is moved clockwise in the figure by the link bar 4 in conjunction with the movement of the loading platform 7. Then, when the bed 7 is sufficiently inserted, the cylinder rod 2 is extended to lift the bed 7. As a result, a heavy object can be placed on the loading platform 7. Then, the truck is turned by the free rear wheel 5, and the heavy object is conveyed to the target position.

[0004]

However, the conventional transport cart can easily lift a heavy object and move forward and backward. However, since the front wheel is a fixed wheel, it can be freely moved in a desired direction (for example, left and right direction). There is a drawback that the steering wheel must be switched in such a case, because the driver cannot proceed.

[0005] As a result, the conventional transport cart has the drawbacks that it takes a long time to operate and requires skill. Here, it is conceivable to replace the front wheel with a free wheel similarly to the rear wheel. However, as shown in FIG. 11, the free wheel is such that the rotating surface 8a of the rotating unit 8 is at a horizontal position with respect to the transport surface 9. At times, the flexibility is exhibited, so that it becomes difficult to rotate when the rotating surface is inclined. As a result, there is a disadvantage that all the wheels cannot be made free wheels in the conventional transport cart.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a transport trolley in which a free wheel can be applied to all wheels to move a carrier vertically.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a transport trolley having a plurality of wheels below a carrier, wherein a lower portion of the carrier is pivoted about a horizontal axis. A turntable that is disposed so as to be rotatable around a vertical axis and that supports a wheel bracket to which the wheel is mounted, and a cam member that is arranged so as to be able to contact a tapered surface formed on each turntable. A cylinder body connected to one side of the cam members, and a cylinder rod connected to the other side of the cam members, the cylinder body being provided on the carrier so as to be movable in the front-rear direction; And a cylinder device for simultaneously reciprocating each cam member by being driven, and driving the cylinder device to simultaneously move each of the cam members and press the tapered surface of each of the rotating tables. To rotate each turntable at the same time. By, characterized in that the position of each wheel is varied simultaneously and in adjustable bed height.

[0008]

According to the present invention, the position of each wheel is changed by moving each cam member by the driving device to reciprocate, pressing the tapered surface of each turntable and turning each turntable. Adjust the height of the loading platform. For example, when a heavy object placed on a sleeper is to be placed on the carrier of the transport cart, each cam member is moved by the above-described driving device to rotate each turntable in a predetermined direction, and the wheels together with the wheel brackets. It turns to the loading platform side to lower the height of the loading platform. Next, when the height of the bed becomes lower than the crossties, the driving device is stopped, and the bed is inserted below the heavy object. Next, the driving device is operated to move the cam member in the direction opposite to the predetermined direction, thereby returning the height of the carrier to the original height. This allows the heavy object to be placed on the carrier.

Further, since the wheels are rotatably supported on the axle by the turntable, the wheels can be easily turned in the direction of the position for transporting heavy objects.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a carriage according to the present invention. 1 and 2 show a first embodiment of a transport trolley 10 according to the present invention. The transport trolley 10 includes a carrier 12, front wheels 14, 14, and a rear wheel 1.
6, 16 and a hand pushing portion 18.

As shown in FIGS. 3 and 4, each of the front wheels 14 is connected via a bracket 15 to a lower portion of a gradient base 22 having a rotating portion 20. The rotating part 20 includes a front wheel 14
The front wheel 14 is rotatably supported by an axis (vertical axis) perpendicular to the wheel shaft 14a as a rotation axis as indicated by an arrow in FIG. The gradient table 22 is supported so as to rotate about a pin 24 (horizontal axis) as a rotation axis to a position shown by a two-dot chain line in the figure, and has a tapered surface 22a formed on the upper surface thereof. Further, a cam 26 is disposed on the tapered surface 22a so as to be able to contact the tapered surface 22a.

Each of the cams 26 is connected to both ends of an elongated arm 28 as shown in FIG. This arm 2
8 has a cylinder rod 32 of a hydraulic cylinder 30
Are linked. The right ends of a pair of rack gears 34, 34, the left ends of which are fixed to the arm 28,
It is slidably supported on 6, 36. The pair of rack gears 34 are supported by rack gears 40 formed on the hydraulic cylinder 30 via pinions 38. The pinion 38 is rotatably supported by a pin 39.

The hydraulic cylinder 30 has a hydraulic pipe 4
2 and is attached to the oil tank 44 via the oil tank 4
4 is connected to a hydraulic pump 48 via a hydraulic pipe 46. The hydraulic pump 48 is provided with the hand pushing portion 18 shown in FIG.
Is manually controlled by the lever 19 of the first embodiment. The hydraulic pump 48 is connected to an oil drain valve 52 via a hydraulic pipe 50 and a hydraulic pipe 46.

Each of the rear wheels 16 is, like the front wheel 14, mounted on a gradient base 56 having a rotating portion 54 by a bracket 17.
Are connected via. The rotating portion 54 rotatably supports the rear wheel 16 with an axis (vertical axis) perpendicular to the wheel shaft 16a of the front wheel 16 as a rotation axis, as indicated by an arrow in FIG. The gradient table 56 is supported so as to rotate about a pin 58 (horizontal axis) as a rotation axis to a position shown by a two-dot chain line in the figure, and has a tapered surface 56a formed on the upper surface thereof. Further, a cam 60 is arranged on the tapered surface 56a so as to be able to contact the tapered surface 56a.

Each of the cams 60 is connected to both ends of an elongated arm 62 as shown in FIG. This arm 6
The right end of the above-mentioned hydraulic cylinder 30 is connected to the center of 2. Next, the operation of the transport trolley configured as described above will be described. First, the transport cart 10 in a running state
(That is, the transport truck 10 in a state where the front wheels 14 and the rear wheels 16 are at the positions shown in FIGS. 1, 3 and 4 and the carrier 12 is on the upper side), and a heavy object is placed on the carrier 12 Will be described.

The oil drain valve 52 connected to the pipe 50 and the oil pipe 46 shown in FIG.
Drain the oil inside and drain this oil into the hydraulic pipes 42, 46, 5
The oil is supplied to the oil tank 44 through the oil tank 44. When the oil in the cylinder 30 escapes, the cylinder rod 32 contracts, and in conjunction with this, the cylinder 30 moves the pinions 38, 38.
And moves toward the front wheel 14 and stops at the position shown in FIG.

At this time, the cams 26 and 60 are
Since the cylinders 8 and 62 are pulled in conjunction with the movement of the cylinder 30 and the cylinder rod 32, the slope tables 22 and 56 are pulled.
And stops at the position shown in FIG. Therefore, each front wheel 14 and each rear wheel 16 are
Since the wheels 6 and 60 have retreated from the gradient tables 22 and 56, they rotate in the direction of the arrow in FIG. 4 and are substantially stored in the loading platform 12 as shown in FIG. Thereby, the carrier 12 is
The vehicle height decreases from the position shown in FIG. 1 to the position shown in FIG.

Next, the transport cart 10 is inserted between the sleepers 64 indicated by a two-dot chain line in FIG. Next, the oil drain valve 52 is closed and the hydraulic pump 48 is operated to feed oil into the cylinder 30. When oil is supplied into the cylinder 30, the cylinder rod 32 extends, and in conjunction with this, the cylinder 30 is guided by the pinions 38, 38, and the rear wheel 1
It moves in six directions and stops at the position shown in FIG.

At this time, the cams 26 and 60 are
As the cylinders 8 and 62 are pulled apart in conjunction with the movement of the cylinder 30 and the cylinder rod 32, they move while pressing the tapered surfaces 22a and 56a of the gradient bases 22 and 56 and stop at the position shown in FIG. Thereby, the carrier 12 is
The vehicle height rises from the position shown in FIG. 7 to the position shown in FIG. 1, and the placing of the heavy object 66 is completed and the vehicle enters the running state.

When the transport cart 10 on which the heavy object 66 is placed is transported to the target position, each front wheel 14 and each rear wheel 16 are attached to each of the rotating parts 20 and 54 of each of the gradient platforms 22 and 56. Since it is rotatably supported, it is possible to change its direction to the target position on the spot, regardless of the direction of the target position. Therefore, according to the present embodiment, the operation can be easily performed as compared with the conventional transport cart in which the direction change position is restricted.

FIG. 8 shows a second embodiment of the carriage according to the present invention. The cams 26 and 60 are connected by a single cylinder rod 68 so as to move in the same direction. Also, the tapered surface 2 of the gradient base 22 on the front wheel 14 side
2b is formed in a direction opposite to that of the second embodiment. According to the second embodiment configured as described above, by moving the cylinder rod 68 left and right, each of the front wheels 14,
The position of each rear wheel 16 can be changed appropriately. Therefore, the bed 12 can be moved up and down.

FIG. 9 shows a third embodiment of a transport cart according to the present invention. The cams 26 and 60 are connected to cylinder rods 70 and 72 which extend and contract in conjunction with each other to move in different directions. It is composed of Further, the tapered surface 56b of the gradient base 56 on the front wheel 16 side is formed in a direction opposite to that of the first embodiment and the second embodiment. According to the third embodiment thus configured, each of the front wheels 14 and each of the rear wheels 16 can be stored in the loading platform 12 by moving each of the cylinder rods 70 and 72 in the direction in which they are drawn, and can be separated. The carrier 12 can be moved up and down by moving in the direction.

[0023]

As described above, according to the transportation cart according to the present invention, the turning table, the cam member, and the driving device are provided, and the driving device moves each of the cam members to move each of the turning tables. By pressing the tapered surface of each and rotating each turntable, the height of the load bed can be adjusted by changing the position of each wheel, so the free wheel is applied to all wheels and the vertical movement of the load bed It can be carried out.

[Brief description of the drawings]

FIG. 1 is a side view showing a first embodiment of a transport trolley according to the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is an explanatory view of a mechanism in a case where a carrier of the transport cart according to the present invention is positioned on an upper side;

FIG. 4 is a side view of FIG. 3;

FIG. 5 is an explanatory view of a mechanism in a case where the carrier of the transport cart according to the present invention is located on the lower side.

FIG. 6 is a side view of FIG.

FIG. 7 is an explanatory view showing a state in which the transport cart according to the present invention places a heavy object.

FIG. 8 is a side view showing a second embodiment of the transport trolley according to the present invention.

FIG. 9 is a side view showing a third embodiment of the transport trolley according to the present invention.

FIG. 10 is an explanatory view showing an embodiment of a conventional transport cart.

FIG. 11 is an explanatory view of a free wheel of a conventional transport cart.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Transportation trolley 12 ... Loading board 14 ... Front wheel 16 ... Rear wheel 20,54 ... Rotating part 22,56 ... Gradient base 22a, 22b, 56a, 56b ... Taper surface 26,60 ... Cam 28,62 ... Arm 30 ... Hydraulic Cylinder 32 ... Cylinder rod

Claims (1)

(57) [Claims] 1. A transport truck having a plurality of wheels below a carrier, wherein a wheel bracket mounted on a lower portion of the carrier so as to be rotatable about a horizontal axis and to which wheels are attached is mounted on a vertical shaft. to center pivotally supported on the turntable, a cam member which is contactable disposed tapered surface formed on the turntable, with provided movably in the front-rear direction to the loading platform, the
One of the cam members arranged before and after the loading platform
Cylinder member to which the cam member is connected, and the cam member on the other side
And a cylinder rod portion connected to the
Cylinder device for reciprocating each cam member at the same time
When made, by simultaneously rotating each time Dodai presses the tapered surface of said each time Dodai by driving the cylinder device to move the respective cam member at the same time, the position of each wheel the
A transport trolley characterized in that the height of the pallet can be adjusted by changing the occasion .