JPH092275A - Motor-driven dolly with lifting function - Google Patents

Abstract

PURPOSE: To positively prevent descent of a load carrier at the time of an elevating power part being damage so as to improve safety by disposing a shaft, provided with spiral grooves inclined in the opposite directions from the axial center, near the center of the load carrier, and rotating the shaft by external power to elevate the load carrier through bendable arms. CONSTITUTION: When an elevating motor 10 is driven, power is transmitted to an elevating shaft 9 so as to be rotated. The elevating shaft 9 has spiral grooves formed in the state of being inclined in the opposite directions symmetrically from the center of the shaft 9, and sliders 11 are screwed with the respective grooves, so that the sliders 11 are moved in the laterally symmetric state by the rotation of the elevating shaft 9. This power in the thrust direction is transmitted to upper and lower arms 8a, 8b connected in a bendable state, and the power in the thrust direction is converted into radial power by these arms to elevate a load carrier 2. A complicated hydraulic jack and a hydraulic pump can thereby be dispensed with, and safety at the time of failure can be ensured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric transport vehicle having a function of easily raising and lowering a large load or a heavy load with a small force.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 57-159861 discloses an electric carrier having a propulsion function and a lifting / lowering function for a loading platform.

According to the prior art, it is disclosed that a hydraulic pump is driven to raise and lower the loading platform and pressure is applied to a hydraulic jack used for lifting the loading platform through a high-pressure hose to raise and lower the loading platform.

[0004]

In the prior art, since the pump is driven to hydraulically power the jack, the hose connecting the pump and the jack is damaged due to deterioration and the connecting portion between the pump and the jack is dropped. As a result, pressure will not be applied inside the jack, and it will not be possible to lift or lower the platform. Further, if the hydraulic pressure is released for some reason while performing operations such as lifting and lowering operations and loading and unloading of luggage, the cargo bed may suddenly lower.

An object of the present invention is to provide a shaft for raising and lowering by arranging a shaft having a spiral groove symmetrically about the center of the carrier near the center of the carrier and rotating the carrier by external power to elevate the carrier carrier. An object of the present invention is to provide an electric transport vehicle with a lift function, in which the loading platform does not descend even if a part is damaged, and safety during work is improved.

[0006]

An electric transport vehicle with a lift function according to the present invention has a pair of sliders each rotatably supporting one end of an arm, and the sliders screwed together to form a spiral shape symmetrical with respect to the center. This is achieved by having a shaft with a groove and rotating the shaft to move the platform portion up and down.

[0007]

In the electric transport vehicle with lift function according to the present invention, a pair of shafts having spiral grooves grooved symmetrically with respect to the center in the vicinity of the center of the loading platform are rotated by external power and screwed to the shafts. The slider reciprocates in the thrust direction with respect to the shaft. The movement in the thrust direction is returned to the power in the radial direction by the arms rotatably attached to the four corners of the bed via the slider, and the bed is moved up and down.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the equipment configuration of an electric carrier for carrying or lifting a heavy load or a large load according to the present invention. 1, 2 and 3, 1
Is a carrier for carrying luggage, 2 is a carrier for being connected to the carrier and for carrying luggage, 3 is a motor which is a power source for driving and propelling the carrier, and 4 is a motor for decelerating the rotation of the motor 3. A deceleration booster for obtaining the rotational force required for propelling the transport vehicle, 5 is a drive wheel for transmitting the rotational force obtained from the deceleration booster 4 to the road surface to propel the transport vehicle, and 6 is a transport vehicle A fixed wheel for supporting the carrier, 7 a free wheel for supporting the carrier and changing the direction of the carrier, 8 an arm for connecting the carrier and the carrier to perform the lifting operation of the carrier 2, and 9 a carrier 2 An elevating shaft which is connected to an arm 8 and is spirally grooved symmetrically about the center in order to elevate and lower the elevating shaft, 10 is an elevating motor which is a power for rotating the elevating shaft 9,
Reference numeral 11 is a slider for connecting the arm 8 and the lifting shaft 9, 12 is a lifting motor 10 and a slide shaft connected so that the lifting motor 10 can slide up and down, and 13 is for supporting the carrier 1. And a handle for changing the direction, 14 is a driving motor 3 and a lifting motor 10
Is a power source of the battery, 15 is a speed adjusting volume for adjusting the rotations of the driving motor 3 and the lifting motor 10 via the controller, 16 is a changeover switch for switching between traveling and lifting operations, and 17 is for driving The motor 3 is energized to indicate that the motor 3 is in a traveling state, and 18 is an elevating lamp that is energized by the elevating motor 10 to indicate that the vehicle is in an elevating state.

The operation of the electric transport vehicle with lift function according to the present invention will be described with reference to the drawings. When the changeover switch 16 indicates the traveling side, the traveling motor 2 side is a closed circuit as shown by the solid line in FIG. Next, it is energized and rotates. In this case, the propulsive force obtained by the drive motor 2 is amplified by the deceleration booster 4 into the propulsive force required for driving and transmitted to the drive wheels 5. Then, due to the frictional force generated between the drive wheel 5 and the road surface, the drive wheel 5 does not idle and propels the transport vehicle. When the transport vehicle is stopped, the speed adjusting volume 15 is fully turned counterclockwise to cut off the flow of electricity from the battery 14, which is the power source, and stop the rotation of the drive motor 2.

On the other hand, when the change-over switch 16 indicates the raising / lowering side, the raising / lowering motor 10 side becomes a closed circuit as shown by the broken line in FIG. In this case, the power obtained from the lifting motor 10 is the lifting motor 10
It is transmitted to the lifting shaft 9 connected to the tip of the lifting shaft 9, and the lifting shaft 8 rotates. The elevating shaft 8 is provided with a spiral groove in the center of the shaft symmetrically, and the slider 11 for connecting the arm 8 and the elevating shaft 9 is also in the same direction as the elevating shaft 9 as shown in FIG. To make a groove. The lifting shaft 9 and the slider 11
In the same manner as the screw principle, when the lifting shaft 9 rotates, the slider 11 moves symmetrically with respect to the lifting shaft 9 as shown by the arrow in FIG.
The power in the thrust direction is transmitted to the arm 8c, and the power in the thrust direction of the slider 11 is converted into the power in the radial direction perpendicular to the lifting shaft 8 by the arms 8a and 8b. The arm 8a and the arm 8b are connected by a pin so as to be movable like the portion 8d. The power converted in the radial direction is used as the power for moving the loading platform 2 up and down. However, when the loading platform 2 moves up and down, the lifting motor 10 that is a power source inevitably moves up and down. Therefore, as shown in FIG. Connecting. Further, when the loading platform 2 is used at the lowest height, it interferes with the transportation vehicle 1 and the loading platform 2, so that the loading vehicle 2 and the loading platform 2 are provided with an escape portion for the lifting motor 11 as shown by the broken line in FIG. Even when it is used at the lowest position, it can be stored without interfering with the lifting motor 10. In this case, the motor has been described as the power for raising and lowering, but it can be changed according to the purpose of use and the place of use, such as a manual type in which the handle is turned by hand instead of the motor or a system driven by compressed air.

When this elevating shaft 9 is used, complicated hydraulic jacks and hydraulic pumps are not required, the maintainability is dramatically improved, and the weight of the apparatus can be reduced, so that the operating time can be extended. Then, by reducing the interval between the spiral grooves formed on the lifting shaft 9, it becomes possible to operate with a small lifting motor. When the same motor is used, heavier loads can be lifted and lowered. On the contrary, if the interval between the spiral grooves is increased, the speed at the time of ascending and descending can be increased and the working time can be shortened.

[0012]

According to the electric transport vehicle with a lift function according to the present invention, even when the power for raising and lowering is damaged, the loading platform does not descend and the safety during work is improved.

[Brief description of drawings]

FIG. 1 is a side view of an electric carrier with a lift function according to the present invention.

FIG. 2 is a front view of an electric carrier with a lift function.

FIG. 3 is a front view of a lower portion of the electric transport vehicle with a lift function.

FIG. 4 is a front view of a control operation unit.

FIG. 5 is an electric circuit diagram for switching motors.

FIG. 6 is a sectional view of a slider.

FIG. 7 is a perspective view of a motor and a slide shaft.

[Explanation of symbols]

8 ... Arm, 9 ... Elevating shaft, 10 ... Elevating motor, 11 ... Slider, 12 ... Sliding shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshikatsu Itoh 5 3085, Higashiishikawa Nishikouchi, Hitachinaka City, Ibaraki Prefecture Hitachi Car Electronics Co., Ltd. Car Electronics Co., Ltd. (72) Inventor Takuji Ujiie 5305, 3085 Higashiishikawa Nishikonai, Hitachinaka City, Ibaraki Hitachi Car Electronics Co., Ltd.

Claims (2)

[Claims] 1. A trolley for loading, transporting and lifting loads, a motor for driving and propelling the trolley, a deceleration booster for amplifying the propulsive force of the motor, and a power source for the motor. A certain battery, a controller for controlling the propulsive force of the motor, a pair of first arms having one end rotatably supported by the carriage, and a pair of second arms having one end rotatably supported by the carrier. In an electric transport vehicle including an arm, a pair of sliders that rotatably support the other end of each of the arms and a shaft that is screwed with the slider and has a spiral groove formed symmetrically from the center. An electric transport vehicle with a lift function, characterized in that the shaft is rotated to vertically move a bed portion. 2. The electric transport vehicle with a lift function according to claim 1, wherein the two pairs of arms are attached to the four corners of the luggage carrier and the carriage.