JPH0648301A - Power lift type hand dolly - Google Patents

Abstract

PURPOSE:To provide a light-weight power lift type hand dolly simple in structure, easy in maintainance, and low in the manufacturing cost in which the contamination by the leak of battery liquid and operating oil is eliminated, the loading and unloading of the hand dolly itself on a truck is facilitated, and when a loading deck touches an obstruction, the impact is eased to prevent the breakage of the loading deck and touched material. CONSTITUTION:A power lift type hand dolly is formed of a loading deck 1: a lifting guide 5 for lifting and guiding the loading deck 1; and a hand wheel base 20. A lifting driving means 10 is formed of an air cylinder 11 for lifting the deck 1; a compressed gas bomb 19 charged with compressed gas; and a gas controller 18 for supplying and controlling the compressed gas supplied from the compressed gas bomb 19 to the air cylinder 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power lift type hand truck for raising and lowering a loading platform by power in a hand truck.

[0002]

2. Description of the Related Art The basic structure of a power lift type hand truck of this type is constructed, for example, as shown in FIG. It comprises a loading platform 101, a lifting guide 105 for the loading platform 101, a lifting drive means 110 for lifting the loading platform 101, and a hand truck platform 120 on which the lifting guide 105 and the lifting drive means 110 are mounted. In addition, reference numeral 121 in FIG. 7 is a base that constitutes the hand cart 120, 122 and 123 are wheels,
Reference numeral 124 is a handle for carrying by hand.

The lift drive means 110 for raising and lowering the platform 101 conventionally includes a hydraulic cylinder 111 for raising and lowering the platform 101, a pressure oil supply device 114 for supplying pressure oil to the hydraulic cylinder 111, and a pressure oil supply device 114. Electric motor 115 to be operated, battery 116 to drive electric motor 115, and controller 1 to drive and control electric motor 115
18 and. A pulley 125 is provided at the tip of the output rod 112 of the hydraulic cylinder 111.
A wire 126 is wound around the pulley 125, one end of which is fixed to the loading platform 101, and the other end of which is fixed to the wire fixture 106 of the elevating guide 105.

[0004]

The above-mentioned prior art has the following problems. I. In this conventional example, in addition to the hydraulic cylinder 111 as the lifting drive means 110, the pressure oil supply device 114, the electric motor 115, and the battery 116 are mounted, so that the structure is complicated and heavy, the maintenance is time-consuming, and the manufacturing cost is high. . B. During operation, vibration or the like causes leakage of battery fluid or hydraulic oil, which easily causes contamination. C. This type of hand truck may be loaded onto a truck together with a load and used locally as a power lift type hand truck.In this conventional example, however, it is heavy and easy to load and unload on a truck. Not. D. If they are stacked horizontally, the battery fluid will leak out, or if this power lift type hand cart is loaded in the vertical position as it is, the height will be high and there is a danger that it may fall down during truck transportation, which is dangerous. E. Since the hydraulic oil is incompressible, if the load is brought into contact with an obstacle when the load is moved up and down, the impact is not relieved and the load or the contact is damaged.

Therefore, in order to solve the above-mentioned inconvenience, a power lift type hand truck as shown in FIG. 7 was previously devised (hereinafter referred to as a prior invention example). In this prior invention example, in the power lift type hand truck having the conventional basic structure, the lifting drive means 10 also serves as the lifting guide 5 of the loading platform 1, and
A pair of left and right air cylinders 11 for raising and lowering the platform 1, a small air compressor 30, and an air compressor 30.
Small engine 31 that drives the car, and air compressor 3
The auxiliary tank 32 stores the air compressed at 0, and a gas controller (not shown) that controls the supply of the compressed air supplied from the auxiliary tank 32 to the air cylinder 11.

Reference numeral 20 in FIG. 7 denotes a hand cart 20. The hand cart 20 has a base 21, wheels 22 for supporting the base 21, and one end fixed to the base 21. And a machine frame that also serves as the hand-pushing and carrying handle 24. In addition, the cargo bed 1 has the connecting fittings 4 and the connecting pins 3 at the base end portion (the lower end portion in the drawing) of the cylinder outer cylinder 13 of each air cylinder 11.
And each loading platform support rod 2 is attached.

This prior invention example is based on the above-mentioned b. C. Although it eliminates the inconvenience of e to some extent, it still has the following drawbacks. F. In addition to the air cylinder 11, a small air compressor 30, a small engine 31, and an auxiliary tank 32 are required as the elevating and lowering driving means 10 for elevating and lowering the loading platform 1. Therefore, the structure is complicated, the maintenance is time-consuming, and the manufacturing cost is high. G. When a power lift type hand truck is placed on a truck and moved horizontally, the fuel and oil of the engine 31 leaks out, so that the vehicle cannot be placed horizontally. Further, when the power lift type hand truck is loaded in the vertical position as it is, the height becomes high, and therefore there is a risk of falling during truck transportation. The present invention has been made in consideration of such circumstances, and an object of the present invention is to solve the above problems (1) to (6).

[0008]

Means for Solving the Problems In order to solve the above-mentioned problems, the means adopted by the present invention is a power lift type hand truck having the above-mentioned basic structure. The gist of the invention is that it comprises an air cylinder 11 that moves up and down, a compressed gas cylinder 19 filled with compressed gas, and a gas controller 18 that controls the supply of compressed gas supplied from the compressed gas cylinder 19 to the air cylinder 11.

[0009]

The present invention operates as follows with the above construction. The loading platform 1 moves up and down along the pair of lifting guides 5. The lifting operation of the loading platform 1 is performed by the operator controlling the compressed gas supplied to the air cylinder 11 with the gas controller 18. That is, the compressed gas cylinder 19 filled with the compressed gas functions as a lifting drive source in place of the battery, electric motor, pressure oil supply device of the prior art, the air compressor 30, the small engine 31, and the auxiliary tank 32 of the prior art example. .

[0010]

As a result, the following effects are obtained. I. In the ascending / descending driving means 10 for ascending / descending the loading platform 1, the compressed gas cylinder 19 functions in place of the battery, electric motor, and pressure oil supply device of the prior art, and the air compressor 30, the small engine 31, and the auxiliary tank 32 of the previously devised example. Since it works instead, it has a simple and lightweight structure, is easy to maintain, and is inexpensive to manufacture. B. Even if the compressed gas leaks during operation due to vibration or the like, contamination such as battery fluid or hydraulic oil does not occur. C. When moving a power lift type hand truck to a truck etc. and moving it horizontally, there is no leakage of battery liquid as in the conventional example or leakage of fuel or oil as in the previous invention. So you can stack them horizontally. D. In addition, because they can be stacked horizontally, they can be easily loaded and unloaded from trucks and are safe from falling over while moving. E. Moreover, since the working gas is compressible, even if the working bed comes into contact with an obstacle when moving up and down, there is no risk of the impact being relieved and the carrying bed or the contacting object being damaged.

[0011]

Embodiments of the present invention will now be described in more detail with reference to the drawings. FIG. 1 is a side view showing a state of a power lift type hand truck according to an embodiment of the present invention at the time of hand carriage.
Is a side view showing the stopped state of the power lift type hand truck, FIG. 3 is a plan view thereof, and FIG. 4 is a front view thereof.

This power lift type hand truck is shown in FIGS.
As shown in FIG. 1, the loading platform 1, a pair of lifting guides 5 for guiding the loading platform 1 up and down, and lifting drive means 10 for lifting the loading platform 1
And a hand cart 20 on which the lifting guide 5 and the lifting drive means 10 are mounted. The hand cart 20 includes a base 21, wheels 22 that support the base 21, a machine frame that also serves as a hand-carrying handle 24 having one end fixed to the base 21, and a machine frame 24. A pair of left and right air cylinders 11 and 11 are erected on the base 21 as a lifting guide 5, and a compressed gas cylinder 19 is used as a drive source for operating the air cylinder 11. It is installed.

When carrying the load W by carrying the power lift type hand cart by hand, as shown in FIG. 1, the wheel 22 and casters 23 support the base 21 obliquely, and When raising and lowering the luggage W, as shown in FIG. 2, the base 21 is grounded to make the air cylinder 11 vertical and the casters 23 are flipped up. At this time, the caster 23 is pulled by the pulling force of a spring (not shown).
Is configured to be maintained in the flip-up state shown in FIG.

In each of the air cylinders 11, the tip end portion (lower end portion in the figure) of the output rod 12 is fixedly mounted on the upper surface of the base 21, and the output rod 12 is moved forward and backward to move the cylinder outer cylinder 13 Is configured to move up and down. The loading platform 1 is attached to the base end portion (the lower end portion in the figure) of each cylinder outer cylinder 13 via the connecting fittings 4, the connecting pins 3 and the loading platform support rods 2, and is opened in the connecting fittings 4. The pin insertion holes 3a formed in the carrier support rod 2 with respect to the pin insertion holes (not shown), and the connecting pins 3 are inserted into these pin insertion holes, so that the carrier 1 can be properly inserted. It is configured so that the position can be selected at the height.

In this embodiment, a pair of left and right elevating guides 5, 5
Is also used as the air cylinder 11, 11 as described above,
Further, the elevating / lowering drive means 10 controls the air cylinders 11 for elevating and lowering the platform 1, the compressed gas cylinders 19 filled with compressed gas, and the gas control for supplying and controlling the compressed gas supplied from the compressed gas cylinders 19 to the air cylinders 11. Bowl 18
The compressed gas supplied from the compressed gas cylinder 19 is controlled by the gas controller 18 to operate the air cylinder 11 to move the loading platform 1 up and down.

The gas controller 18 is provided with an operating handle 18a for supplying compressed gas and an atmosphere communication valve 18b for discharging the compressed gas in the air cylinder 11, and is attached to one of the left and right handles 24. By operating the operation handle 18a and the atmosphere communication valve 18b, the compressed gas supplied from the compressed gas cylinder 19 is controlled, and the output rod 12 of the air cylinder 11 is expanded / contracted to move the loading platform 1 It can be located at any suitable height.

FIG. 5 is a side view showing the lifted state of the bed of the power lift type hand truck. In this case, in consideration of the height of loading and unloading of the cargo W, the bed is supported on the connecting metal fitting 4. The bottom of the rod 2 is connected. FIG. 5 shows a typical mode of use when, for example, the loads W are stacked on the bed of a truck from the ground. FIG. 6 is a side view showing the lowered state of the bed of this power lift type hand truck. In this case,
The uppermost part of the luggage carrier support rod 2 is connected to the connecting fitting 4. This 6 diagram shows, for example, a luggage W from a truck bed or the like.
The typical usage mode at the time of unloading is shown.

In the above embodiment, the air cylinder 1
Since the pair of left and right elevating guides is also used as one and the platform support rod 2 is appropriately positioned with respect to the coupling fitting 4, there are many advantages as described below in addition to the effects of the invention. By substantially omitting the lifting guide of the conventional example, it is lightweight, has a simple structure, is easy to handle, has a low manufacturing cost, and has a good front view. Moreover, the height (total height) can be reduced while ensuring a sufficient height for loading and unloading, so that the luggage can be transported to a place with a low ceiling.

The present invention is not limited to the above-described embodiment, but is provided with the lifting guide 5 in addition to the air cylinder 11, the position of the loading platform 1 cannot be changed, and the hand truck platform 2 is provided.
It is not necessary to say that it can be carried out by appropriately changing it, such as the case where there is no 0 caster 23.

[Brief description of drawings]

FIG. 1 is a side view showing a state of a power lift type hand guided vehicle according to an embodiment of the present invention during hand carrying.

FIG. 2 is a side view showing a stopped state of the power lift type hand truck.

FIG. 3 is a plan view showing a stopped state of the power lift type hand truck.

FIG. 4 is a front view showing a stopped state of the power lift type hand truck.

FIG. 5 is a side view showing the raised state of the bed of the power lift type hand truck.

FIG. 6 is a side view showing a lowered state of the bed of the power lift type hand truck.

FIG. 7 is a view corresponding to FIG. 2 according to the previously devised example.

FIG. 8 is a side view showing a lifted state of a loading platform of a power lift type hand truck according to a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Loading platform, 5 ... Elevating guide, 10 ... Elevating drive means, 11 ... Air cylinder, 18 ... Gas controller, 19 ... Compressed gas cylinder, 20 ... Hand cart.

Claims (2)

[Claims] 1. A loading platform (1), a lifting guide (5) for raising and lowering the loading platform (1), and a lifting drive means (1) for lifting the loading platform (1).
0) and a hand truck (20) equipped with the elevating guide (5) and the elevating drive means (10), wherein the elevating drive means (10) is the loading platform (20). 1) Air cylinder (11) for moving up and down, and compressed gas cylinder (1
A power lift type hand truck comprising: 9) and a gas controller (18) for controlling the supply of compressed gas supplied from the compressed gas cylinder (19) to the air cylinder (11). 2. The power lift type hand truck according to claim 1, wherein the lifting guide (5) is also used by the air cylinder (11).