JPH10181609A - Conveying truck that can get over level difference - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a truck travelable even on the floor face with a level difference at a construction site or the like by providing an intermediate auxiliary wheel that can be pushed out downward by the operation of a step difference get-over lever, between a front wheel and a rear wheel of a truck body. SOLUTION: Until coming to step difference, a truck travels by front and rear wheels 2, 3, with an intermediate auxiliary wheel 5 in a lifted state. When the front wheel 2 comes to the step difference, while pushing a step difference get-over lever 4 forward, that is, while pushing out the intermediate auxiliary wheel 5 downward by rotating a triangular plate 6 downward through a rod 9, the rear part of the truck is pushed down to lift the front wheel 2 and to place it on the step difference. The step difference get-over lever 4 is then retreated to reset the intermediate auxiliary wheel 5 upward, and the truck is advanced until the rear wheel 3 comes to the step difference. When the rear wheel 3 comes to the step difference, the step difference get-over lever 4 is pushed forward to push out the intermediate auxiliary wheel 5 downward. At the same time, the rear part of the truck is pulled up to place the rear wheel 3 on the step difference.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport trolley capable of traveling over a stepped floor such as a construction site.

[0002]

2. Description of the Related Art When a general transporting vehicle gets over a step, the pushing force required for getting over the step is about the same as the weight applied to the wheel at a step having a size of about 1/3 of the wheel radius. When the weight is large, it is difficult to get over. Japanese Patent Laid-Open No. 6-9 / 1993 discloses a mechanism that enables a vehicle to run on a step.
Japanese Unexamined Patent Publication No. 7-101366 discloses a "traveling vehicle" disclosed in Japanese Patent Application Laid-Open No. 2272/1990 and a "step-movable vehicle and a step-traveling adapter for a vehicle" disclosed in Japanese Patent Application Laid-Open No. 7-101366. Can be seen.

[0003]

However, the former has a very complicated structure, and the latter requires a large force for a heavy object and a large-scale structure in which the entire truck is lifted by a lift. There is a problem that. Therefore, the present invention makes it possible to get over a step that is difficult to get over with a general transporting cart, arranges wheels at the front, rear, and middle of the cart, and raises and lowers the intermediate wheel by a link or the like to make the front and rear wheels easier. The above problem is solved by being lifted. And a hand cart,
This is applicable to both bogies with running power.

[0004]

In order to achieve the above object, the invention according to claim 1 is directed to an intermediate auxiliary wheel which is pushed downward between a front wheel 2 and a rear wheel 3 of a bogie main body 1 by operating a step over lever 4. 5 is provided.

[0005] The invention according to claim 2 is that before the front wheel 2 and the rear wheel 3 of the bogie body 1 are arbitrarily pushed downward by the operation of the stepping over lever 4 near the front wheel 2 and the rear wheel 3. The auxiliary wheels 12 and the rear auxiliary wheels 13 are provided.

According to a third aspect of the present invention, a frame 23 which can be bent up and down at an intermediate portion is provided below the bogie main body 1, and a front wheel 2 and a rear wheel 3 are provided at a front end and a rear end of the frame. A middle wheel 24 is provided in the middle portion, and the frame 23 is bent up and down by operating the stepping over lever 4.

According to a fourth aspect of the present invention, the arrangement of the left and right front wheels 2 and the rear wheels 3 disposed on the frame 32 arranged beneath the bogie main body 1 is shifted forward and backward on the left and right sides, and The frame 32 is formed so that it can be bent up and down around an axis A connecting the rear wheel 2 on the retreating side and the rear wheel 3 on the forward side.
It is characterized in that it has a structure in which 32 is bent up and down by operation of the hand push handles 33 and 34.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a transport vehicle according to the present invention. In addition,
The following embodiments are all hand carts, but are also applicable to carts with running power. In addition, although mechanical means is used for pushing out the auxiliary wheels, an electric motor, an air cylinder, or the like may be used. Although the auxiliary wheels are provided as a left-right pair, the auxiliary wheels may be provided one by one at the left and right centers.

FIG. 1 is a hand truck having an auxiliary wheel-type step-override mechanism according to an embodiment of the present invention. 1
(1) to (4) show the steps in order to get over a step in order.

The push cart shown in FIG. 1 has a pair of left and right intermediate auxiliary members which are pushed out in the middle of a pair of left and right front wheels 2 and rear wheels 3 of a bogie main body 1 in conjunction with the operation of a stepping over lever 4. A wheel 5 is provided, and each intermediate auxiliary wheel is lightly pulled up by a spring or the like when unnecessary.
Specifically, the pair of left and right front wheels 2 are fixed wheels that do not turn, the pair of left and right rear wheels 3 are free wheels that are free to turn, and the pair of left and right intermediate auxiliary wheels 5 are not turning. A shaft 7 at each corner of a pair of triangular plates 6
The other one corner of each triangular plate 6 is pivotally attached to the middle part of the bogie main body 1 so as to be vertically rotatable, and both triangular plates 6 are mechanically connected to each other to be linked. The other corner of 6 is linked to the above-mentioned step-over lever 4 via a rod 9, and this lever is
The bogie main body 1 is pivotally connected 11 to the bogie main body 1 along a side surface of a push handle 10 standing upright from a rear portion thereof.

Here, the steps when going over the steps shown in (1) to (4) will be described in order. (1) The vehicle is driven with the intermediate auxiliary wheel 5 raised up to the point where the vehicle reaches the step. (2) When the front wheel 2 is approaching a step, the bogie is pushed while pushing the stepping over lever 4 forward, that is, while lowering the triangular plate 6 through the rod 9 to push the intermediate auxiliary wheel 5 downward. By pushing down the rear part, the front wheel 2 is lifted and put on the step. (3) Move the lever 4 over the bump to retreat, and
At the same time, and move forward until the rear wheel 3 approaches a step. (4) When the rear wheel 3 approaches a step, the rear wheel 3 is put on the step by pulling up the rear part of the bogie while pushing the stepping over lever 4 forward to push out the intermediate auxiliary wheel 5 downward. That is, when climbing over a step, the lever 4
The intermediate auxiliary wheel 5 can be pushed out with a small force by the leverage action, and the intermediate auxiliary wheel 5 pushes up the vicinity of the center of the bogie, so that the operation of pushing down and raising the rear part of the bogie can be performed with a small force. .

(2) [Transportation Cart with an Auxiliary Wheel Type Step Over Mechanism] FIGS. 2 and 3 show a push cart with an auxiliary wheel type step over mechanism according to an embodiment of the present invention. The main parts, (1) to (4) of FIG. 2, show the steps in order to get over a step in order.

The push cart shown in FIG. 2 includes a pair of left and right front wheels 2 and a pair of rear wheels 3 between a pair of front wheels 2 and a rear wheel 3 of a truck body 1.
A pair of front auxiliary wheels 12 and rear auxiliary wheels 13
The front auxiliary wheel 12 is used when the front wheel 2 is mounted on a step, and the rear auxiliary wheel is used when the rear wheel is mounted on a step.
13 is configured to be pushed downward by interlocking with the operation of the stepping over lever 4, and each auxiliary wheel is lightly pulled up by a spring or the like when unnecessary. In particular,
The pair of left and right front wheels 2 are fixed wheels that do not turn, the pair of left and right rear wheels 3 are free wheels that are free to turn, and the pair of left and right front auxiliary wheels 12 and rear auxiliary wheels 13 are not turned. Axes 16 and 17 are attached to the distal ends of a pair of forward arms 14 and a rear arm 15, respectively, and the bases of the pair of arms are pivotally attached 18 to the center of the bogie body 1 together ( FIG. 3), the forearm 14 and the rear arm 15 are mechanically linked to each other so that they are linked to each other. Confronting abutment surfaces 19 and 20 are formed, and these abutment surfaces 1 and 20 are formed.
An oscillating piece 21 is disposed so as to cover 9, 20. The lower end of the oscillating piece is pivotally attached to the pivot 18 together with a pin 22 projecting from the inner surface of the upper end. It is inserted between the abutment surfaces 19 and 20 (FIG. 3), and the upper end of the swinging piece 21 is linked to the stepping over lever 4 via a rod 9 by linking. Along the side surface of the push handle 10 erected from the rear of the vehicle, it is pivotally connected 11 to the bogie main body 1.

Here, as in the previous case, (1) to (4) in FIG.
Will be described in order. (1) The vehicle travels with the front auxiliary wheel 12 and the rear auxiliary wheel 13 raised up to the point where the vehicle reaches the step. (2) When the front wheel 2 approaches a step, the front arm 14 is brought into contact with the pin 22 by pulling the stepping over lever 4 toward the front, that is, by tilting the swinging piece 21 forward through the rod 9. The front wheel 2 is lifted and put on a step while pushing the surface 19 and rotating the front arm 14 downward to push the front auxiliary wheel 12 downward. In this case, the front wheel 2 can be lifted with only a small force by operating the step-over-lever lever 4 and by leverage of the step-over lever 4, and there is no need to push down the rear part of the bogie. (3) Return the stepping over lever 4 to return the front auxiliary wheel 12 to the up position and return, and move the rear wheel 3 forward until the rear wheel 3 approaches the step. (4) When the rear wheel 3 approaches a step, the lever 22 is pushed forward by the stepping over lever 4, that is, the rocking piece 21 is tilted backward through the rod 9, so that the pin 22 impinges on the rear arm 15. The rear wheel 3 is placed on a step by pushing up the rear portion of the bogie while pushing the mating surface 20 and rotating the rear arm 16 downward to push the rear auxiliary wheel 13 downward. Also in this case, the rear wheel 3 can be lifted with only a simple operation of the step-over-lever lever 4 and with a smaller force for leverage of the step-over lever 4, and there is no need to pull up the rear part of the bogie.

Part 3. [Transportation Cart with Rough Terrain Traveling Type Step Overriding Mechanism] FIG. 4 is a push cart with an irregular terrain traveling type step overcoming mechanism showing an embodiment according to the third aspect of the present invention. 4 (1) to 4 (4) sequentially show the steps when going over a large step.

The push cart shown in FIG. 4 has a frame 23 which can be bent up and down at an intermediate portion under the cart main body 1, and a pair of left and right front wheels 2 and a rear wheel are provided at a front end and a rear end of the frame. 3 is formed into a six-wheeled vehicle by providing a pair of left and right middle wheels 24 in the middle portion, and the frame 23 is forcibly bent up and down by the stepping over lever 4. Specifically, the front wheel 2 and the rear wheel 3 are both free wheels that can freely turn, and the middle wheel 24 does not turn.
23, the rear end of the front half portion 25 and the front end of the rear half portion 26 are respectively pivoted 27 with the left and right facing downward, and the left and right middle wheels 24 are rotatably mounted on the pivot of the pivot. , And the first half 25
Is vertically linked to the front part of the bogie main body 1 via a pair of left and right connecting pieces 28, and the middle part of the rear half 26 is connected to the bogie main body 1.
The frame 23 is attached to the bogie main body 1 by the pivotal attachment and the link connection by the connecting piece 28 so as to be able to bend and extend, and the rear end 26 The rear end of the carriage body 1 is linked to the stepping over lever 4 via a connecting piece 31 so as to be movable up and down, and the lever is moved along the side surface of the push handle 10 erected from the rear of the carriage body 1.
It is pivotally connected to 11.

Next, a description will be given in order of the steps when going over a large step shown in (1) to (4) of FIG. (1) The vehicle travels without operating the lever 4 for climbing over the step until it reaches a large step. At this time, when traveling on uneven terrain, the front wheel 2, rear wheel 3 and middle wheel 24
Ascends and descends with 23 flexion and adapts to irregular terrain. (2) When the front wheel 2 approaches a large step, the frame 23 is folded downward through the connecting piece 31 by pulling the stepping over lever 4 toward the front, the middle wheel 24 is pushed downward, and the front wheel 2 and The front wheel 2 is lifted by raising the rear wheel 3 and depressing the rear part of the bogie by pushing down the push handle 10 to put the front wheel on the step. (3) When the middle wheel 24 approaches the step, the stepping over lever 4 is pushed forward, the frame 23 is folded upward through the connecting piece 31, the front wheel 2 and the rear wheel 3 are lowered, and the And put the middle wheel on the step. (4) When the rear wheel 3 approaches the step, pull the lever 4 over the step, as in the case of the front wheel 2,
Folding the frame 23 downward through the connecting piece 31, pushing the middle wheel 24 downward, and raising the front wheel 2 and the rear wheel 3,
Then, the rear wheel 3 is lifted by raising the push handle 10 and raising the rear portion of the bogie, and the rear wheel 3 is placed on the step. In this case, the operation of the lever 4 for moving over the step can be moved with a small force by leverage, and the pushing down and lifting of the hand wheel 10 can be performed with a small force by pushing the middle wheel 24 downward. As described above, by repeatedly pushing and pulling the lever 4 over the step, it is possible to get over a large step.

[4] [Transportation Car with Rough Terrain Traveling Type Step Overriding Mechanism] FIGS. 5 to 14 show an embodiment according to the fourth aspect of the present invention. It is a truck, and (1) to (6) of FIG. 14 sequentially show the steps when getting over a large step.

The push carts shown in FIGS. 5 to 14 are substantially the same as those in the previous example, except that the left and right front wheels 2 and the rear wheels 3 are arranged on a frame 32 arranged below the cart body 1. The left and right sides are shifted back and forth so that they are at the four corners of the parallelogram in the plane, and the frame
32 is an axis A connecting the front wheel 2 on the retreating side and the rear wheel 3 on the forward side.
The front and rear two members are pivotally attached 46 so as to be able to bend up and down around (FIG. 8), and the frame 32 is forcibly bent up and down by raising and lowering a pair of left and right hand push handles 33 and 34. . More specifically, the front wheel 2 and the rear wheel 3 are both free wheels that can freely rotate, and the frame 32 is connected to the bogie main body 1 via connecting pieces 35 at four displaced front and rear portions, respectively.
Linked with. However, in order to maintain the vertical relationship between the bogie body 1 and the frame 32, the rear two
Only the upper part of the connecting piece 35 is fixed to the bogie body 1 (welding).
Let me. The axial directions of the front left and right two link connections and the rear right and left link connections are made common to each other, and their axes B and C (FIGS. 7 and 8) are parallel to the axis A. Let me. Left and right hand push handle
33 and 34 are mounted on the upper surface of the rear end of the bogie main body 1 so as to be able to stand upright in a normal pushing state and to be inclined obliquely backward in a stepping over operation. A link mechanism 36 connected to the frame 32 in front of the axis C (FIGS. 7 and 8), and one push handle 34 is connected to the frame 32 behind the axis C. In addition, the hand push handles 33, 34 are tilted toward one of the control levers 38, 39 to push the locking pieces 40, 41 into a fan-shaped and fixed lock plate 42 by tilting to one of the control levers 38, 39. , 43 is engaged with the notch 47 (located at the top) to lock the push handle in an upright state (FIGS. 5, 11, and 13). To release the lock and tilt the handwheels 33 and 34. Notches 50 and 51 of the sector a and the rotation of the engaging plate 48 and 49 of the link mechanism 36, 37 the engaging pieces 40, 41 by defeating obliquely corresponding to the hand wheel
(Located diagonally rearward) to link mechanisms 36, 37
(FIGS. 9, 10 and 12) are provided with operation switching mechanisms 44 and 45.

In this case, during normal running, the two-hand push handles 33, 34 are both erected, and the respective control levers 38, 34
The locking pieces 40, 41 are locked by locking plates 42, 41
By engaging with the locks 43, the upright state is maintained and the push handles 33, 34 thereof are maintained.
Press to run. At this time, when traveling on uneven terrain, the front wheels 2 and the rear wheels 3 move up and down with the flexion and extension of the frame 32, and adapt to the uneven terrain. When climbing over a large step, the locking pieces 40, 41 are disengaged from the notches 47 of the lock plates 42, 43 by tilting the control levers 38, 39 of the left or right hand push handles 33, 34 to the other side to lock them. The state is released and the push handle is lowered toward the front, so that the locking pieces 40, 41 are notched in the notches 50, 49 of the corresponding engaging plates 48, 49 of the link mechanisms 36, 37.
14 and mechanically connected to the link mechanisms 36 and 37, and as shown in FIGS. 14 (1) to (6), the push handle is pulled down or raised toward the front, and through the link mechanism. The frame 32 is folded upward or downward, and the front wheel 2 and the rear wheel 3 are raised one by one. This is shown in FIG.
The details of (1) to (6) are as follows. (1) or
(3) shows a case where one of the push handles 33 is raised and lowered. However, it is assumed that the other hand push handle 34 is locked in an upright state. As shown in (1),
Before the one hand push handle 33 is turned upside down, the front wheels 2 and the rear wheels 3 are all at the normal running height. As shown in (2), when the one push handle 33 is pulled down,
One front wheel 2 in the retreat position is raised. Next, as shown in (3), when the one hand push handle 33 is pulled up, one rear wheel 3 in the retreat position is raised. Also, (4) through (6) are:
The case where the other hand-push handle 34 is turned upside down is shown. However, it is assumed that one push handle 33 is locked in the upright state. As shown in (4), the front wheel 2 and the rear wheel 3
Are all at normal running height. As shown in (5), when the other hand push handle 34 is pulled down, one front wheel 2 in the forward position is raised. Next, as shown in (6), when the other hand push handle 34 is pulled up, one rear wheel 3 in the forward position is raised. Therefore, the front wheels 2 and the rear wheel (3) may be successively put on the steps by operating the hand-operated handles 33, 34 and their control levers 38, 39 in accordance with the running condition with respect to the steps. The two-handed push handles 33, 34 can be operated with a small force by leverage.

[0021]

According to the first, second, third, and fourth aspects of the present invention, the following effects are achieved by the above-described configuration. (1) Conventionally, it is possible to easily get over a step which is difficult to get over with a general transporting vehicle by a simple lever operation. (2) Conventionally, transport materials such as trucks cannot be used, so building materials that were transported manually by dividing them many times can now be transported in bulk by transport trucks, shortening work time and saving labor. Becomes possible. (3) Conventionally, the structure was very complicated, or a large-scale structure that required a large force to lift a bogie with a heavy load on heavy objects was replaced with a simple and compact structure. it can. (4) The lever operation can be performed using power from an electric motor, an air cylinder, or the like, which makes the operation easier and lighter.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration and an operation according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a configuration and an operation according to an embodiment of the present invention.

FIG. 3 is an enlarged detail view of a main part of the embodiment.

FIG. 4 is an explanatory diagram of a configuration and operation showing an embodiment according to the third invention.

FIG. 5 is a side view showing an embodiment according to the fourth aspect of the present invention.

FIG. 6 is a rear view of the embodiment.

FIG. 7 is a plan view of the bogie main body according to the embodiment.

FIG. 8 is a plan view of a frame and wheels according to the embodiment.

FIG. 9 is an essential part enlarged side view showing one hand push handle, an operation switching mechanism, and a link mechanism in the embodiment.

FIG. 10 is an enlarged side view of a main part showing the other hand push handle, operation switching mechanism, and link mechanism in the embodiment.

FIG. 11 is an enlarged side view of the lock plate according to the embodiment.

FIG. 12 is an enlarged cutaway rear view showing a state in which the operation switching mechanism according to the embodiment is linked to the hand-push handle / link mechanism.

FIG. 13 is an enlarged rear view of the operation switching mechanism in the embodiment, showing a state in which the hand-push handle and the lock plate are connected to each other.

FIG. 14 is an explanatory diagram of the operation in the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dolly main body 2 ... Front wheel 3 ... Rear wheel 4 ... Stepping over lever 5 ... Intermediate auxiliary wheel 6 ... Triangle plate 7 ... Axle 8 ... Pivot 9 ... Rod 10 ... Handwheel 11 ... Pivot 12 ... Front auxiliary wheel 13 … Rear auxiliary wheel 14… Front arm 15… Rear arm 16,17… Axle attachment 18… Pivot 19,20… Abutment surface 21… Swinging piece 22… Pin 23… Frame 24… Middle wheel 25… Front half 26… Rear half 27… Pivot 28… Connecting piece 29… Vertical piece 30… Pivot 31… Linking piece 32… Frame 33,34… Hand-push handle 35… Connecting piece 36,37… Link mechanism 38,39… Control lever 40,41 … Locking pieces 42,43… Lock plates 44,45… Operation switching mechanism 46… Pivot 47… Notches 48,49… Engagement plates 50,51… Notches

Claims (4)

[Claims] 1. Between a front wheel 2 and a rear wheel 3 of a bogie main body 1,
A carriage capable of climbing over a step, comprising an intermediate auxiliary wheel (5) which is pushed downward by operation of a stepping over lever (4). 2. Between a front wheel 2 and a rear wheel 3 of a bogie main body 1,
Near the front wheel 2 and near the rear wheel 3, a step-over lever 4
Front wheel 12 and rear wheel 13
A transport trolley that is capable of climbing over steps. 3. A frame 23, which can be bent up and down at an intermediate portion, is arranged below the bogie main body 1. A front wheel 2 and a rear wheel 3 are provided at a front end and a rear end of the frame. A transport vehicle capable of climbing over a step, wherein each of the wheels is provided with a frame 24 and the frame 23 is bent up and down by operating a lever 4 for climbing over a step. 4. The arrangement of the left and right front wheels 2 and rear wheels 3 arranged on a frame 32 arranged side by side under the carriage body 1 is shifted back and forth on the left and right sides to form a parallelogram in a plane. The frame 32 is formed so as to be able to bend up and down around an axis A connecting the front wheel 2 on the retreating side and the rear wheel 3 on the advancing side. A transport trolley with a structure that can be folded up and down by the operation of 34, which is capable of climbing over steps.