JP2011255760A - Conveyance truck - Google Patents

Abstract

A transport cart capable of transporting an object to be conveyed in the front-rear direction and the lateral direction while being loaded on a caster cart.
A pallet carriage 11 that can be moved forward and backward and traversed and that can be raised and lowered relative to a floor surface, and a lifting table 12 that can be raised and lowered with respect to the pallet carriage, are selectively provided for the pallet carriage. A switchable main traveling wheel 17A and a transverse traveling wheel 17B are provided. The pallet carriage 11 is raised and supported by pressing against the lower surface of the caster carriage or the lower surface of the object to be moved forward and backward, and when the pallet carriage 11 descends, the lifting table 12 is raised to lower the lower surface of the caster carriage or the object to be conveyed. It is possible to press and support the lower surface of the plate.
[Selection] Figure 1

Description

  The present invention relates to a transport cart for transporting various materials at a construction work site, for example, and more particularly to a transport cart capable of transporting materials loaded on a caster cart while being loaded on the caster cart.

As this type of carriage, for example, the one disclosed in Patent Document 1 is known.
As shown in FIG. 17, this is mainly a well-known pallet cart 1 having a traveling wheel 2 and a traction handle 3, but the pallet cart 1 has a turntable for the purpose of transporting a long material 4. 5 is provided so that the rear part of the material 4 to be transported is loaded in a state of being supported between the turntable 5 while being supported by a caster cart 6 that can move in any direction.

  According to this, by functioning as a semi-trailer using the pallet truck 1 as a towing vehicle, the material 4 can be turned and bent even in a sharp curve, so that even one worker can efficiently carry it. Although it is said that it can be done, the normal construction work site is narrow, and it is often impossible to secure a sufficient turning space, and it is often not possible to sufficiently handle even with such a carriage, so it is widely applied to the general public. It is not possible and has not become widespread.

Incidentally, a simple caster cart 6 as shown in FIG. 17 is widely used at construction work sites, and various materials are often transported manually by using it. In that case, when changing the conveyance direction, it is necessary to change the direction by maneuvering the caster cart 6 manually, but when changing a narrow construction work site or a long material, the direction cannot be changed freely. In many cases, it is difficult for one worker to handle easily.
For example, when a long or large material is loaded on the caster cart 6 and vertically conveyed by the elevator, the caster cart 6 loaded with the material is moved forward to enter the elevator, and the caster cart 6 is moved backward on a predetermined floor. Then, the caster carriage 6 is turned forward or left and right to be transported to a desired position. However, if there is not enough space for the direction change before the elevator, it is transported as it is. In this case, there is a case where an extra work such as reloading to another caster cart 6 is required.

Therefore, with respect to the well-known pallet truck 1 as shown in Patent Document 1, by using a traveling wheel for forward and backward traveling and a traveling wheel for traversing independently and selectively using them, Pallet carts that can switch between forward and backward movement (transportation in the front-rear direction) and transverse movement (transportation in the left-right direction) without changing the direction are also put into practical use.
According to this, when the pallet cart is lowered, the material is lifted by entering the lower surface of the material and raising the pallet cart, and either the traveling wheel for forward or backward traveling or the traveling wheel for traversing is selected. Since it can be transported in the desired direction, it can be easily switched without the need for routing work and space for it, and is considered effective for transporting materials at construction sites. It is done.

Japanese Patent Laid-Open No. 9-277939

  However, this type of conventional pallet truck is generally of a type in which the height of the trolley itself changes between forward and backward movement and when traversing. However, when the material loaded on the caster cart 6 remains loaded on the caster cart 6, that is, when the material is transported together with the caster cart 6, as described above, And only one of the horizontal directions can be selected, which is inconvenient.

  That is, in this type of pallet truck, the pallet truck is in a high position during normal forward / backward traveling with the traveling wheels for forward / reverse travel, and the pallet truck descends when switching from that state to the transverse traveling with the traveling wheels for lateral travel. On the contrary, when the pallet truck is in a low position during normal forward / backward traveling with the traveling wheels for lowering and moving from the state to the transverse traveling with the traveling wheels for traversing There is a type in which the pallet carriage rises (lateral movement type when ascending).

On the other hand, since the height of the general-purpose caster cart 6 for loading materials is constant, the former type lifts the caster cart 6 with the pallet cart or pushes the pallet cart against the lower surface of the caster cart 6 when moving forward and backward. Although it can be transported in the front-rear direction by supporting it, the pallet cart can be lowered to a position lower than the caster cart 6 when transporting in the lateral direction, so that the caster cart 6 can be lifted or pressed against its lower surface. Therefore, conveyance in the lateral direction is impossible.
Similarly, in the latter type, although the caster cart 6 is lifted by the pallet cart when traversing or is pressed against the lower surface of the caster cart 6 by the pallet cart, the pallet cart can be transported in the lateral direction. Is lowered to a position lower than the caster carriage 6, and the caster carriage 6 cannot be lifted or pressed against the lower surface thereof, and therefore it cannot be conveyed in the front-rear direction.

  As described above, in the conventional pallet truck, various materials cannot be transported as they are in the front-rear direction and the left-right direction while being loaded on the caster truck 6, so that the mobility is sufficient for use at the construction work site. However, it has been desired to provide an effective and appropriate transport cart that is more maneuverable.

  According to the first aspect of the present invention, there is provided a transport cart capable of transporting an object to be transported, which is loaded on a caster cart movable in an arbitrary direction on a floor surface, together with the caster cart in the front-rear direction and the left-right direction and transporting the transported object to an arbitrary position. A pallet truck that includes a traveling wheel and a steering mechanism and is capable of moving forward and backward and traversing and capable of moving up and down with respect to the floor, and a lift table that is installed to be movable up and down with respect to the pallet truck. It is characterized by.

  The invention according to claim 2 is the transport cart according to claim 1, wherein the pallet cart is supported by the caster cart or the caster cart with the pallet cart and the lifting table lowered. A traveling wheel in the pallet carriage is configured by a main traveling wheel for forward and backward movement and a sub traveling wheel for traversing, which can be selectively switched, The main traveling wheel is allowed to roll on the floor surface when the carriage moves forward and backward, and the auxiliary traveling wheel floats on the floor surface, and the main traveling wheel when the pallet carriage traverses. Is stored in a position where it floats on the floor surface, and the pallet truck descends so that the auxiliary traveling wheels can roll on the floor surface. Rise In this state, the upper surface of the pallet truck or the lifting table can be pressed and supported against the lower surface of the caster carriage or the lower surface of the object to be transported. By storing and lowering the pallet cart with respect to the floor surface, the lifting table is raised with respect to the pallet cart so that the upper surface of the lifting table is the lower surface of the caster cart or the lower surface of the object to be conveyed. It is comprised so that a press support is possible.

According to the transport cart of the present invention, by providing a lifting table that can be further raised and lowered with respect to the pallet cart that can be raised and lowered relative to the floor surface, the floor of the lifting table regardless of the height from the floor surface of the pallet cart. The height from the surface can be set freely, and the change in the height when the traveling direction of the pallet truck is switched can be compensated by the lifting operation of the lifting table.
Therefore, according to the transport cart of the present invention, the pallet cart can be loaded and loaded on the caster cart both forward and backward and without traversing without any troublesome operation and operation. It is possible to support and transport existing materials, and is extremely excellent in mobility compared to this type of conventional pallet truck, and is suitable for transporting various materials in a narrow construction work site.

It is a side view (state at the time of forward / rearward travel) showing a schematic configuration of a transport cart according to an embodiment of the present invention. FIG. It is a back view and a front view (state at the time of forward / backward traveling). It is a side view (state at the time of traversal) same as the above. They are a rear view and a front view (state at the time of traversal). It is a side view (state which raised the raising / lowering table at the time of traversing) same as the above. FIG. 4 is a diagram illustrating a conveyance procedure and illustrating a conveyance state of a long material. It is a figure (state which makes a transport cart get in an elevator) which shows a conveyance procedure same as the above. It is a figure (state which made the pallet cart approach to the lower part of material) showing a conveyance procedure same as the above. It is a figure (state which supported materials) which shows a conveyance procedure same as the above. It is a figure (state which is being lowered | hung from an elevator) which shows a conveyance procedure equally. It is a figure (state in which the pallet cart was lowered) showing the conveyance procedure. It is a figure (state which raised the raising / lowering table) which shows a conveyance procedure equally. It is a figure (state switched to transverse mode) which shows a conveyance procedure similarly. It is a side view which shows schematic structure of the conveyance trolley which is other embodiment of this invention. FIG. It is a figure which shows an example of the conventional conveyance trolley | bogie.

Hereinafter, an embodiment of a transport cart of the present invention will be described with reference to the drawings.
The transport cart 10 of the present embodiment is mainly composed of a pallet cart 11 configured in the same manner as the conventional pallet cart 1 as shown in Patent Document 1, The pallet carriage 11 is provided with a lifting table 12 so that the material 4 can be transported in both the front-rear direction and the left-right direction while being loaded on the caster carriage 6 as shown in FIG. This is a structural feature.
1-6 is a figure which shows schematic structure of the conveyance trolley | bogie 10 of this embodiment, FIG. 1-3 shows the state at the time of normal driving | running | working (at the time of forward / backward traveling), and FIGS. FIG. 6 shows a state where the elevator table 12 is further raised from that state.

  The pallet carriage 11 of this embodiment includes a steering mechanism 13 composed of one drive wheel 15 and its operation handle 16 driven by the electric unit 14, and two wheels provided on the lower surface side of the front portion of the pallet carriage 11. Four traveling wheels 17, that is, a main traveling wheel 17 </ b> A for forward / rearward travel and a sub traveling wheel 17 </ b> B for traversing, can be self-propelled on the floor surface by operation of the steering mechanism 13, and these main traveling wheels By selectively switching the 17A and the auxiliary traveling wheel 17B, the pallet cart 11 itself can be moved forward and backward without changing the direction of the pallet cart 11 itself as in the above-described conventional “lateral movement type when descending” pallet cart. It can be shifted to the horizontal traversal as it is.

That is, the traverse auxiliary traveling wheel 17B is fixedly attached to the lower surface side of the pallet carriage 11, while the forward / backward main traveling wheel 17A is attached to the tip of the arm 18 that can swing in the vertical direction. When the vehicle travels normally, as shown in FIG. 1, the arm 18 rotates downward and the main traveling wheel 17A comes into contact with the floor surface, and the vehicle travels forward and backward. In this state, the entire pallet carriage 11 can be raised and lowered with respect to the floor surface by operating the hydraulic cylinder 19.
In order to shift from the above state to the horizontal movement, the arm 18 is rotated upward and the main traveling wheels 17A are stored upward as shown in FIG. The secondary traveling wheel 17B is in a transverse mode in which it is in contact with the floor surface. In this state, the operation handle 16 is rotated 90 degrees to turn the driving wheel 15 in the lateral direction, thereby allowing the transverse movement.

  In addition to the basic configuration described above, the transporting carriage according to the present embodiment is provided with an elevating table 12 via an elevating mechanism 20 above the pallet carriage 11. In the illustrated example, a scissors type lift mechanism driven by a hydraulic cylinder is adopted as the lifting mechanism 20, and the lifting table 12 is lowered to the position of the upper surface of the pallet carriage 11 by the operation as shown in FIG. 1 or FIG. As shown in FIG. 6, the elevating table 12 can be lifted from the state of being.

  As described above, in the conventional lateral movement type pallet truck when descending, the material can be moved forward and backward together with the caster truck 6, but cannot be traversed. However, in the transport truck 10 of the present embodiment, the pallet truck is used. 11 is provided with the elevating table 12 so that the material can be traversed as it is as well as moving forward and backward while being loaded on the caster cart 6.

Hereinafter, with reference to FIGS. 7-14, the procedure in the case of conveying the material 4 currently loaded on the caster cart 6 in the front-back direction and the left-right direction with the caster cart 6 using the transport cart 10 of this embodiment is demonstrated. To do.
Here, as shown in FIG. 7, an example is shown in which two caster carts 6 are used to transport both ends of a long material 4 as a material to be conveyed while being supported by the caster carts 6. A case will be described in which the material 4 vertically transported by the elevator in such a state is unloaded from the elevator by the transport carriage 10 of this embodiment and transported as it is in the lateral direction (arrow direction in FIG. 7).

As shown in FIG. 8, the transport cart 10 is set in the forward / reverse mode and is lowered into the elevator, and the transport cart 10 enters the center of the material 4 as shown in FIG. 9.
Next, as shown in FIG. 10, the pallet carriage 11 is slightly raised and the upper surface of the lifting table 12 is pressed against the lower surface of the material 4 so that a part of the weight of the material 4 is received by the caster carriage 11. 4 is supported by the caster cart 6 and the pallet cart 11 on both sides.
In this state, since the material 4 can be transported by the transport cart 10, the transport cart 10 is moved backward as shown in FIG. 11, and the material 4 is lowered together with the caster cart 6 from the elevator.

Then, in order to transport the material 4 in the lateral direction from that state, the pallet carriage 11 is switched from the forward / reverse mode to the transverse mode. As a result, as shown in FIG. 12, the main traveling wheel 17A for forward / rearward movement is housed upward and the auxiliary traveling wheel 17B for traversing comes in contact with the floor surface, so that the entire pallet carriage 11 is lowered. 12 is separated from the lower surface of the material 4 and cannot be transported as it is.
Therefore, as shown in FIG. 13, the lifting table 12 is slightly raised with respect to the pallet carriage 11, and the upper surface thereof is pressed against the lower surface of the material 4 to take part of the weight of the material. As a result, since the material 4 can be supported by the three caster carts 6 and the pallet cart 11 on both sides as in the previous state and can be transported again, the drive wheel 15 is rotated 90 degrees as shown in FIG. Then, the pallet carriage 11 is moved in the horizontal direction to transport the material 4 in the horizontal direction (see FIG. 7).

  As described above, according to the transporting carriage 10 of the present invention, by compensating the lowering of the pallet carriage 11 during traversal by the ascent of the elevating table 12, the pallet carriage 11 does not change direction and is troublesome. It is possible to make a quick transition from forward / backward to transverse and from transverse to forward / backward, without the need for labor or operation. Therefore, the transport cart 10 of the present invention is extremely excellent in mobility as compared with a conventional pallet cart of this type, and is suitable for transporting various materials in a narrow construction work site.

  Although one embodiment of the present invention has been described above, the above embodiment is merely a basic example, and the present invention is not limited to the above embodiment. For example, the following appropriate design modifications are possible. And can be applied.

  In the above-described embodiment, a lifting table is installed on a pallet truck that moves downward when traversing, but the main point is that a pallet truck that changes in height when moving forward and backward and when traversing. By compensating for changes in the height of the pallet truck itself with the lifting table, it is sufficient to be able to transport various materials while being loaded on the caster truck. The specific configuration of the lifting mechanism and the like in the lifting table is not particularly limited, and appropriate design changes and applications are possible.

  For example, it is realistic that the carriage of the present invention is configured to be capable of self-propelling with the electric unit 14 as a traveling drive source as in the above embodiment, but the traveling drive source is omitted as a simpler one. A configuration in which the vehicle is manually pushed and pulled is also conceivable.

  Moreover, in the said embodiment, although the pallet cart 11 and the raising / lowering table 12 were made into the flat table shape, they should just be what can lift or support the material 4 and the caster cart 6, for example in FIG. As shown, they may be configured as forks so that they are arranged side by side at the same height during normal forward and backward movement.

  Further, in the above embodiment, a scissors type lift mechanism is used as the lifting mechanism 20 for lifting the lifting table 12, but the present invention is not limited to this, and for example, a hydraulic unit that expands and contracts in the vertical direction as shown in FIG. It is conceivable that the elevating table 12 can be moved up and down by using a sprocket and a chain, or it can be moved up and down manually by a simple jack.

  In the above embodiment, the case where the long material 4 is transported in a state where both ends of the long material 4 are supported by the caster cart 6 is taken as an example, and the central portion of the material 4 is supported and transported by the transport cart of the present invention. However, it is of course possible to transport the caster cart 6 itself carrying the material 4 by lifting or supporting it by the transport cart of the present invention.

4 Materials (conveyed items)
6 Casting Cart 10 Transporting Cart 11 Pallet Cart 12 Lifting Table 13 Steering Mechanism 14 Electric Unit 15 Driving Wheel 16 Operation Handle 17 Traveling Wheel 17A Main Traveling Wheel 17B Sub Traveling Wheel 18 Arm 19 Hydraulic Cylinder 20 Lifting Mechanism

Claims (2)

A transport cart that can be transported to an arbitrary position by moving a transported object loaded on a caster cart movable in an arbitrary direction on the floor surface in the front-rear direction and the left-right direction together with the caster cart,
A pallet truck that includes a traveling wheel and a steering mechanism and that can move forward and backward and traverse, and that can be raised and lowered with respect to the floor surface, and a lifting table that can be raised and lowered with respect to the pallet truck. A characteristic transport cart. The carriage according to claim 1,
The pallet truck is capable of entering the caster carriage or a lower space of the object supported by the caster carriage with the pallet carriage and the lifting table lowered.
The traveling wheel in the pallet truck is composed of a selectively traveling main traveling wheel for forward and backward movement and a sub traveling wheel for traversing, and when the pallet truck moves forward and backward, the main traveling wheel is The secondary traveling wheel is allowed to roll on the floor surface and floats on the floor surface, and when the pallet truck traverses, the main traveling wheel is stored in a position where it floats on the floor surface. When the pallet truck descends, the auxiliary traveling wheel can roll on the floor surface,
When the pallet truck moves forward and backward, the upper surface of the pallet truck or the lifting table can be pressed and supported against the lower surface of the caster carriage or the lower surface of the object to be conveyed while the pallet truck is raised with respect to the floor surface. And when traversing the pallet truck, by storing the main traveling wheel and raising the lifting table with respect to the pallet truck in a state where the pallet truck is lowered with respect to the floor surface, A transport carriage characterized in that the upper surface of the elevating table can be pressed against the lower surface of the caster carriage or the lower surface of the object to be conveyed.

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