JPH06340398A - Conveyor carriage - Google Patents

Abstract

PURPOSE:To keep the height of an uppermost stage of loads piled up in a multistage manner in a constant position where an operator is easy to hold, by setting the height of a burden loaded on a mount optionally. CONSTITUTION:A slider frame 18 is installed in front of a main frame 14, and a mount 22 is installed in this slider frame 18 projectingly. In addition, two gas springs 24, 24 and an extension coil spring 28 are interposed between the slider frame 18 and the main frame 14, and this slider frame 18 is energized to its upward direction, while the slider frame 18 is drawn in its downward direction by the extension coil spring 28. Subsequently, the slider frame 18 and the mount 22 both move on the main frame 14 up and down in a moving distance proportioned to load to be added to this mount 22 by means of balance of each action force out of both these elements.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier truck, and more particularly to a carrier truck provided with a lifting mount.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional carrier truck 1 in which wheels 3, 3 and 4, 4 are pivotally attached to the front, rear, left and right of a mounting table 2, respectively, and the mounting table 2 is brought close to a floor surface 5 to be substantially Install horizontally. A main frame 6 is erected on the rear portion of the mounting table 2, and a handle 7 is fixed on the upper portion thereof. Thus, when transferring the load 9 loaded on the loading platform 8 of the truck, the load 9 is transferred to the loading platform 2 by the operator's hand, and then the operator grips the handle 7. Move the carrier 1 to the destination. On the other hand, the carrier 1
When loading the luggage 9 carried by the truck, the operator lifts the luggage 9 on the mounting table 2 and transfers it to the truck loading platform 8.

[0003]

The conventional carrier 1 is
As described above, the mounting table 2 is close to the floor surface 5, and the mounting position of the luggage 9 is low. Therefore, there is a large difference between the height of the truck bed 8 and the height of the luggage 9 on the loading table 2, and
The worker's labor in loading and unloading is significantly consumed.

A forklift is known as a device capable of vertically changing the position of the mounting table, but the cost is increased due to its complicated structure. Even when a forklift or the like is used, when loads of the same shape are stacked in multiple stages, the difference between the height of the uppermost package and the height of the lowermost package becomes large. Therefore, there is a technical problem to be solved in order to arbitrarily set the height of the loads loaded on the mounting table and to maintain the height of the uppermost stage of the loads stacked in multiple stages at a fixed position that is easy for the operator to hold. Therefore, the present invention aims to solve this problem.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been proposed in order to achieve the above-mentioned object. Wheels are pivotally mounted on a stand installed substantially horizontally, and a main frame is erected on the rear portion of the stand. The slider frame is mounted on the front surface of the main frame so that it can move up and down, and a mounting table is projected from the slider frame.A gas spring is interposed between the upper end of the slider frame and the lower end of the main frame. The slider frame is urged in the ascending direction and the slider frame is pulled in the descending direction by interposing a tension coil spring so that the slider frame moves up and down by a moving distance proportional to the load applied to the mounting table. It is intended to provide a carrier truck.

[0006]

The slider frame is mounted on the front surface of the main frame so as to be vertically movable, and is constantly urged in the upward direction by the gas spring. On the other hand, the tension coil spring pulls the slider frame in the descending direction against the ascending force of the gas spring, and the initial height of the mounting table is set at a position where both acting forces are balanced.

When a load is placed on the mounting table, the gas spring is compressed according to the weight of the load, and the slider frame and the mounting table are lowered by a predetermined stroke. The initial height and the descending stroke of the mounting table are preset by the spring constants and free lengths of the gas spring and the tension coil spring, respectively. Therefore, when loading preset packages of the same shape in multiple stages, every time one package is loaded, the loading table is lowered by the stroke corresponding to the height of the package, and the height of the top package is It will always maintain a fixed position.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 and FIG. 2 show a carrier truck 11 in a state where no luggage is placed, and a reference numeral 12 is a stand. The stand 12 includes a left stand 12a and a right stand 12b.
b are provided in parallel, and the wheels 13 and 1 of small diameter are provided at the front of each.
Pivot 3.

At the rear of the stand 12, a main frame 14 having a width substantially equal to the installation width of the left and right stands 12a, 12b is erected vertically, and large-diameter wheels 15 are provided on both sides of the lower end of the main frame 14. , 15, and
The grips 16, 16 are fixedly provided on both sides of the upper end of the main frame 14. The small-diameter wheels 13, 13 and the large-diameter wheels 15,
The stand 12 is supported substantially horizontally by 15, and the carriage 11 is installed so as to be movable on the floor surface 17.

A slider frame 18 is provided on the front surface of the main frame 14, and the slider frame 1
8 from the rear surface to the left and right guide rollers 19, 19 and 2
0 and 20 are projected. Guide rails 21, 21 are provided on the left and right sides of the main frame 14, and guide rollers 19, 19 and 20, 2 are inserted into the left and right guide rails 21, 21.
0 is inserted to attach the slider frame 18 to the main frame 14 so as to be vertically movable. Further, a mounting table 22 is provided so as to project from the lower end of the slider frame 18 to the front, and the guide rollers 19, 19 and 20, 20 roll inside the guide rails 21 and 21 to be mounted integrally with the slider frame 18. The table 22 is formed so as to move up and down. In this embodiment, the mounting table 22 is a flat table, but it can be replaced with another mounting table having a different shape depending on the shape of the load to be mounted or the method of mounting on a truck.

Brackets 23, 23 are provided on the rear surface of the upper end of the slider frame 18 so as to project therefrom.
One end of the gas springs 24 and 24 is attached to the gas springs 3 and 23, respectively, and brackets 25 and 25 are fixed to the lower end of the main frame 14 to fix the gas springs 24 and 2 respectively.
Attach the other end of 4. Since the gas springs 24, 24 are urged in the extension direction, the slider frame 18 is pushed upward.

A bracket 26 is provided between the brackets 23 and 23 on the rear surface of the upper end of the slider frame 18, and a bracket 27 is fixed between the brackets 25 and 25 at the lower end of the main frame 14. To do. A tension coil spring 28 is interposed between the brackets 26 and 27 to pull the slider frame 18 downward. Therefore, the slider frame 18 is biased in the ascending direction by the gas springs 24 and 24 and is pulled in the descending direction by the tension coil spring 28, and the slider frame 18 is stopped at a position where the acting forces of the two are balanced, and the mounting table is placed. An initial height H of 22 is set. The initial height H is set to a position where the worker can easily hold the luggage 29 while standing.

As shown in FIG. 3, when the load 29 is placed on the mounting table 22, the gas springs 24, 24 are compressed according to the weight of the load 29, and the slider frame 18 and the mounting table 22 are moved. It descends by a predetermined stroke S. For example, when the baggage 29 is a fixed quantity having the same shape such as a rice bag, a fertilizer bag, or a package packed in a regular cardboard, the weight and the outer dimensions of the baggage 29 are substantially the same.

Therefore, if the spring constants of the gas springs 24, 24 and the tension coil spring 28 and their free lengths are set to predetermined values in advance in accordance with the weight and external dimensions of the luggage 29, one The stroke S by which the mounting table 22 descends when the luggage 29 is placed can be matched with the height dimension of the luggage 29. The attachment length of the tension coil spring can be adjusted by the screw portion 28a locked to the bracket 27 shown in FIG.

Further, when the packages 29 of the same shape and the same weight are stacked on top of the packages 29 of the mounting table 22, the slider frame 18 and the mounting table 22 are moved by the stroke S each time the stacked packages 29 are increased by one. As shown in FIG. 4, when the five packages 29 are stacked on the mounting table 22, the slider frame 18 and the mounting table 22 are sequentially lowered.
Is lowered by a size corresponding to 5 times the stroke S. That is,
The uppermost height of the stacked loads 29 always holds the initial height H of the mounting table 22. Therefore, in the transfer operation from the truck bed or the like, if the initial height H of the mounting table 22 is set in advance at a position where the operator can easily carry it, the transfer can be performed in a standing posture of the operator. Therefore, the labor of the transfer work can be remarkably reduced.

On the other hand, contrary to the above, in the work of loading the transported cargo 29 on the loading platform of the truck, the height of the cargo 29 at the uppermost stage shown in FIG. Since it matches the natural posture, the uppermost luggage 29 can be easily transferred to the bed of the truck. At that time, since the load 29 on the uppermost stage is removed and the load on the mounting table 22 is reduced, the mounting table 22 and the slider frame 18 are raised by the above-described stroke S, and the uppermost package 29 again.
Is equal to the initial height H of the mounting table 22. Thereafter, in the same manner, the slider frame 18 and the mounting table 22 are sequentially lifted by the stroke S each time one of the loads 29 on the mounting table 22 is removed, and the height of the uppermost baggage 29 is always the mounting table 2
The initial height H is 2, which is maintained at a height that is easy for the operator to hold.

Here, when the luggage 29 is suddenly removed, the slider frame 18 and the mounting table 22 try to rise rapidly due to the bias of the gas spring 24.
The rising force is suppressed by the tensile force of the tension coil spring 28. Therefore, even in such a case, the slider frame 18 and the mounting table 22 slowly rise, and a sudden change in load can be coped with without mounting a damper or the like.

As described above, when carrying the loads 29, 29, ... Stacked on the mounting table 22 in multiple stages, the worker 30 stands behind the carriage 11 as shown in FIG. , 16 are gripped to move the carriage 11 while pushing it forward. Alternatively, as shown in FIG. 6, the worker 30 grips the grips 16 and 16 to carry the carrier 11
May be tilted rearward and only the large-diameter wheels 15, 15 may be moved while touching the ground.

The present invention can be modified in various ways without departing from the spirit of the present invention, and it goes without saying that the present invention extends to such modifications.

[0020]

As described in detail in the above-mentioned embodiment, the present invention sets the initial height of the mounting table at a position where the acting forces of both the gas spring and the tension coil spring are balanced, and mounts the mounted load on the mounting table. The slider frame and the mounting table move up and down in a constant moving distance in proportion to the load. Then, when the packages are sequentially stacked on the mounting table or when the packages stacked on the mounting table are sequentially removed, the height of the uppermost package is always maintained at the initial height of the mounting table.

Therefore, when the load is transferred from the truck bed or the like to the carrier, the height of the load is always maintained at a height that is easy for the operator to hold, and the labor of the transfer work can be significantly reduced. In addition, since the gas spring and the tension coil spring are combined and balanced, even if the load applied to the mounting table changes abruptly, the mounting table moves up and down slowly, and there is no risk of the luggage falling down, and safety is improved. It is an invention that can contribute to the improvement of

[Brief description of drawings]

FIG. 1 is a front view of a carrier truck according to an embodiment of the present invention in a state in which a load is not placed.

FIG. 2 is a side view of the carrier truck with no load placed thereon.

FIG. 3 is a side view of the carrier truck on which one piece of luggage is placed.

FIG. 4 is a side view of the carrier truck in which luggage is placed in multiple stages.

FIG. 5 is a diagram showing an example of a method for moving a carrier truck.

FIG. 6 is a diagram showing another example of a method for moving a carrier truck.

FIG. 7 is a side view of a conventional carrier truck.

[Explanation of symbols]

 11 Transport Carts 12, 12a, 12b Stands 13, 15 Wheels 18 Slider Frame 22 Mounting Table 24 Gas Spring 28 Tension Coil Spring

Claims (1)

[Claims] 1. A wheel is pivotally attached to a substantially horizontally installed stand, a main frame is erected on a rear portion of the stand, and a slider frame is attached to the front surface of the main frame so as to be vertically movable. A mounting table is provided so as to project, and a gas spring is interposed between the upper end of the slider frame and the lower end of the main frame to urge the slider frame in the upward direction, and a tension coil spring is interposed. A carrier truck, characterized in that the slider frame is pulled downward and formed so that the slider frame moves up and down by a moving distance proportional to the load applied to the mounting table.