JP2000168565A - Carrier truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To extend and contract expansion wheels according to a difference in level and carry an object to be carried, keeping a carrier truck horizontal, by providing a moving means constituted of the expansion wheels movable in the vertical direction on front and rear sides of a base on which the object to be carried is mounted and fixed wheels provided on front and rear sides of these expansion wheels. SOLUTION: On a first floor surface A, an object to be carried W is carried in an advancing direction in a state that all of expansion front wheels 5A and expansion rear wheels 5B are drawn up. When the expansion front wheels 5A exceed a descending difference in level part K1 to be a boundary of the first floor surface A and a second floor surface B which is lower than the floor surface A, a worker S operates an operation panel 8 and elongates the expansion front wheels 5A until lower ends of the expansion front wheels 5A reach a floor surface B. When the carrier truck is advanced in this state and the expansion rear wheels 5B exceed the difference in level part K1, the expansion rear wheels 5B are elongaged and the lower ends are mounted on the floor surface B. Therefore, the carrier truck is supported by the elongaged expansion front wheels 5A and expansion rear wheels 5B and is moved to the front, on the floor surface B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transport trolley used for transporting materials and equipment at a construction site or the like.

[0002]

2. Description of the Related Art In recent years, in RC condominium construction, barrier-free (without steps in a house) designs are increasing, and as a result, a number of steps having different dimensions are often generated when floor slabs are constructed. Along with this, in the horizontal transport work for transporting construction materials such as temporary materials and finishing materials on the construction floor, ordinary carts cannot be used due to the above-mentioned steps, and workers have to handle the above materials and equipment manually. For example, there is a problem that the carrying work is difficult and inefficient, such as carrying by hand. Currently, devices that overcome large steps, including stairs, are being developed, but these devices are large-scale mechanical devices that use caterpillars, large tires, etc., and that can be easily used on construction sites. Was not.

[0003] Japanese Patent Application Laid-Open No. 63-121567 discloses a simple transport trolley used in a work place having a projection on the floor. This is shown in FIG.
As shown in (a), two pairs of front wheels 20 having a lifting means are provided.
a, 20b and rear wheels 20c, 20d. When the bogie 21 moves forward and approaches the projection 23 on the floor 22, the front wheel 20a at the front is moved from the floor 22 to the upper end surface 2 of the projection 23.
After being raised above 3 m, the bogie 21 is advanced, and FIG.
As shown in (b), when the horizontal position of the raised front wheel 20a moves forward of the protrusion 23, the front wheel 20a is lowered, and then the rear front wheel 20b is raised to move the bogie 21 forward. The rear front wheel 20b is lowered to the rear of the projection 23 in the same manner as the front front wheel 20a, and the same operation is performed for the two pairs of rear wheels 20c and 20d. Move to the front of 23. Further, in the above publication, when there is a protrusion in the traveling direction of the bogie 21, as shown in FIGS. 7A and 7B, a wheel close to the protrusion 23, for example, the wheel 20a is turned upward by 90 degrees or 180 degrees. By rotating the wheel 20
A method is also disclosed in which a is moved above the upper end surface 23m of the projection 23 so as not to hit the projection 23.

[0004]

However, the above-described conventional transport cart 21 usually has all the wheels 20a to 20d.
When the protrusions 23 are present on the floor surface 22, the wheels near the protrusions 23 are retracted to a position where they do not hit the protrusions 23, and the carriage 21 is advanced. Therefore, it is difficult to use it for the horizontal transfer operation on the floor where there are many steps having different dimensions as described above. In addition, it is conceivable to provide a lifting means capable of individually controlling the height of each of the wheels of the transport cart 21 so that the wheels can be used on a floor having many steps. In this case, not only the device becomes large-scale, but also the operation of controlling the height of each wheel becomes considerably troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and provides a transport truck having a simple structure and easy operation, which can be easily moved on a floor surface having many steps. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a transport vehicle having front and rear lower portions of a base on which a load is to be mounted, front and rear movable wheels, and a front of each of the expandable wheels. And a moving means comprising at least two fixed wheels provided later, the telescopic wheels are expanded and contracted according to the steps of the floor, and the conveyed goods are conveyed while the conveying cart is kept horizontal.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B are views showing a configuration of a transport vehicle according to an embodiment of the present invention.
(A) is a side view and (b) is a front view. In the figure, reference numeral 1 denotes a rectangular parallelepiped base (hereinafter, referred to as a bogie main body) having a loading bed 1a on a flat plate on which a load W is mounted (hereinafter, referred to as a bogie main body); 3
Are the front left, right and rear left of the lower surface 1b of the carriage body 1,
These are the moving means installed on the right. The moving means 3 includes a telescopic wheel 5 that moves up and down by an electric cylinder 4 provided inside the bogie main body 1 and two fixed wheels 6 provided before and after the telescopic wheel 5, respectively. Have. That is, the transport vehicle according to the present embodiment includes two front front wheels 6 a and two front and rear wheels 6 b provided on the front left and right of the vehicle body 1 and a rear left and right portion of the vehicle body 1. A total of eight fixed wheels 6, including two rear front wheels 6c and two rear rear wheels 6d, and two telescopic front wheels 5A disposed between the front front wheels 6a and the front and rear wheels 6b. , The rear front wheel 6c
Two telescopic rear wheels 5 arranged between the rear wheel 6d and the rear rear wheel 6d.
B and a total of four telescopic wheels 5.

The telescopic wheel 5 of the present embodiment expands and contracts by the electric cylinder 4 with a stroke capable of clearing a floor step size (about 200 mm) generally formed in construction work, and also reduces the weight of the load W and the bogie. It has a thrust to lift and can adjust an arbitrary stroke according to the step size of the floor surface. The electric cylinder 4 is
The operation is performed by a battery 7 installed inside the bogie main body 1, and the operation is performed by an operator operating an operation panel 8 installed at the upper center of the bogie handle 2. The electric cylinder 4 is mounted, for example, as shown in FIG. 1 so as to protrude upward into the bogie main body 1, and has a column-shaped fixed base 4k having a slide groove 4s extending upward and downward.
And a gear (not shown) mounted on a cylindrical body 5b connected to a wheel portion 5a of the telescopic wheel 5 and engaged with a rack 5r that slides up and down along the slide groove 4s via a gear box 4g. A driving motor 4m, and the cylindrical body 5 is rotated by rotation of the motor 4m.
b, that is, the telescopic wheel 5 is moved up and down. The operator operates the operation panel 8 to rotate the motor 4m in the normal direction or the reverse direction, thereby expanding and contracting the telescopic wheel 5.

FIG. 2 is a diagram showing an operation procedure in which one worker S moves the transport trolley of the present embodiment on a floor having a step of a level drop. On the first floor A, as shown in FIG.
It is assumed that the transported object W is being conveyed in the traveling direction (the direction of the arrow in the figure) in a state where all of the front and rear telescopic wheels 5A and the rear telescopic wheels 5B are pulled up. When the telescopic front wheel 5A of the transport trolley crosses the descending step K1, which is the boundary between the first floor A and the second floor B lower than the floor A, the operator S operates the operation panel 8 Is operated to extend the front telescopic front wheel 5A until the lower end of the front telescopic front wheel 5A reaches the floor B as shown in FIG. 2 (b). In this state, the operator moves the transport trolley forward, and as shown in FIG. 2 (c), when the telescopic rear wheel 5B exceeds the step K1, extends the telescopic rear wheel 5B.
The lower end of the telescopic front wheel 5B is placed on the floor B. Therefore, on the floor surface B, as shown in FIG. 2D, the transport vehicle is supported and moved forward by the four extended and retractable front wheels 5A and the extended and retractable rear wheels 5B. When the transported object W is heavy or when the moving distance on the floor B is long, the front and rear telescopic wheels 5A and the rear wheels 5B may be pulled up to move the transport trolley with 12 wheels. .

FIG. 3 is a view showing an operation when the carrier is moved from the state shown in FIG. 2D to a third floor C higher than the second floor B. The boundary with the floor surface C is defined as a stepped portion K2. First, as shown in FIG. 3A, the front front wheel 6a has the same height as the floor surface C and the floor surface A.
When the transport cart is moved forward, the transport cart naturally rests on the floor surface C. Then, when the front and rear telescopic wheels 5A reach the stepped portion K2,
The operator S operates the operation panel 8 and contracts the front telescopic front wheel 5A until the lower surface of the front telescopic front wheel 5A reaches the floor C.
In this state, the operator moves the transport trolley forward, and as shown in FIG. 3B, when the telescopic rear wheel 5B reaches the step K2, contracts the telescopic rear wheel 5B, and then advances the transport trolley. ,
As shown in FIG. 3C, the carrier is moved on the floor C. Therefore, on the floor C, the telescopic wheels 5 of the transport trolley are all in the state of being pulled up as in the state of the floor A described above.

In the case where the carriage is moved after raising the front and rear telescopic front wheels 5A and 5B on the floor B,
This is the same as the operation (FIG. 4) on a floor surface with a level rise step described later. When the third floor surface C is higher than the first floor surface A, when the front front wheel 6a reaches the step K2, the lower surface of the front front wheel 6a becomes lower than the floor surface C.
After extending the telescopic front wheel 5A and the telescopic rear wheel 5B until reaching the upper position, the transport carriage is advanced, and the front front wheel 6a is placed on the floor C. Subsequent operations are performed as described above with reference to FIGS.
Is the same as The third floor C is the first floor A
When the front front wheel 6a reaches the step K2, the front and rear telescopic wheels 5A and the rear telescopic wheels 5B are contracted until the lower surface of the front front wheel 6a reaches the floor C. Forward, and put the front front wheel 6a on the floor C,
The operations shown in FIGS. 3A to 3C are performed.

FIG. 4 is a diagram showing an operation procedure on a floor having a level rise step. On the fourth floor D, FIG.
As shown in (a), it is assumed that the conveyed article W is being conveyed in the traveling direction (the direction of the arrow in the figure) in a state in which all of the telescopic wheels 5 of the carriage are lifted. Front front wheel 6 of transport trolley
a is the fourth floor D and the fifth floor E is higher than the floor D.
When the vehicle reaches the stepped portion K3, which is the boundary between the front and rear wheels 5A and 5B, the transport trolley is advanced until the lower surface of the front front wheel 6a reaches the floor C, and then the transport vehicle is moved forward. The front wheel 6a is placed on the floor E. Next, the telescopic front wheel 5A
Reaches the stepped portion K3, the operator S operates the operation panel 8 to move the front and rear telescopic wheels 5A until the lower end of the front and rear telescopic wheels 5A reaches the floor E as shown in FIG. Shrink. In this state, the operator moves the transport trolley forward, and FIG.
As shown in (c), when the rear wheel 5B reaches the step K3, the rear wheel 5B is contracted. Therefore,
As shown in FIG. 4D, the transport trolley moves forward on the floor E with all of the telescopic wheels 5 pulled up.

FIG. 5 is a view showing an operation when the carrier is moved from the state shown in FIG. 4D to a sixth floor F lower than the fifth floor E. The boundary with the floor F is defined as a stepped portion K4. The height of the sixth floor F may be different from that of the fourth floor D. First, FIG.
As shown in (a), when the telescopic front wheel 5A reaches the step K4, the operator S operates the operation panel 8 to extend and contract the lower surface of the telescopic front wheel 5A until the lower surface reaches the floor C. Extend the front wheel 5A. In this state, the operator moves the transport trolley forward, and as shown in FIG. 5 (b), extends the telescopic rear wheel 5B when the telescopic rear wheel 5B reaches the stepped portion K4, and then advances the transport trolley. Then, as shown in FIG. 5C, the carrier is moved on the floor F. On the floor F, FIG.
As shown in (d), the front and rear telescopic wheels 5A and rear wheels 5B are pulled up, and the transport trolley is moved by 12 wheels. When the transported object W is light or the moving distance on the floor F is short. For example, the carriage may be moved by the four extended telescopic wheels 5 while the front and rear telescopic wheels 5A and 5B are extended.

In the present embodiment, the moving means 3 are installed at four positions on the front left, right and rear left and right of the lower surface 1b in the bogie main body 1, respectively. The center and rear left and right may be three. Alternatively, two front front wheels 6a and two front and rear wheels 6b may be provided at the front left and right, and the telescopic front wheel 5A may be arranged at the front center. However, even in this case, the front-rear relationship between the front front wheels 6a and the front and rear wheels 6b and the telescopic wheels 5A is the same as in the above example, and the front front wheels 6a and the front and rear wheels 6b are provided before and after the telescopic wheels 5A, respectively. Further, in the above example, the telescopic wheel 5 is moved up and down by the electric cylinder 4, but the telescopic wheel 5 may be moved up and down by other telescopic means using a jack or the like.

[0015]

As described above, the carrier according to the first aspect of the present invention is provided in front of and behind the lower part of the base on which the goods are mounted.
In front of the telescopic wheels that can be moved up and down and the above telescopic wheels,
A moving means comprising at least two fixed wheels provided later is provided, and the telescopic wheels are expanded and contracted in accordance with the steps on the floor, and the transported goods are transported while the transport cart is kept horizontal. With this configuration, the transport trolley on which the load is mounted can be stably moved on a floor having many steps.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a transport vehicle according to an embodiment of the present invention.

FIG. 2 is a diagram schematically showing the movement of the carrier when the level is lowered.

FIG. 3 is a diagram schematically showing the movement of a transport cart.

FIG. 4 is a diagram schematically showing the movement of the carrier when the level rises.

FIG. 5 is a diagram schematically showing the movement of a transport vehicle.

FIG. 6 is a diagram illustrating a configuration of a conventional transport vehicle.

FIG. 7 is a diagram showing a method of retreating wheels of a conventional transport vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bogie main body 2 Bogie handle part 3 Moving means 4 Electric cylinder 5A, 5B Telescopic wheel 6a-6d Fixed wheel 7 Battery 8 Operation panel

Claims (1)

[Claims] 1. A moving means comprising a vertically movable telescopic wheel and at least two fixed wheels provided before and after each of said telescopic wheels before and after a lower portion of a base on which a load is mounted. A transport trolley comprising: