JPH04100968U - Self-propelled mobile trolley - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the improvement of a self-propelled mobile trolley used for high-altitude work such as ceiling, wall, wiring, piping, painting, etc. at construction sites, for example.

[Conventional technology] Traditionally, high-altitude work such as ceiling construction, wiring, piping work, lighting installation work, painting work, etc. at construction sites has been carried out by assembling rolling towers and scaffolding, but recently, labor-saving methods have been used. In order to improve efficiency and safety, self-propelled aerial work carts with a lifting platform installed on the cart are increasingly being used.

Conventional work carts of this kind have a structure in which they can only travel forward and backward, and when changing direction, the body is turned by turning the steering wheel.

[Problems to be solved by the invention] However, in the conventional work cart as described above, when the cart is stopped after being turned in either the left or right direction as desired, the steering wheel does not turn. Since the vehicle is stopped in this state, the turning position of the steering wheel is shifted from the front direction of the chassis.

Therefore, when the driver attempts to move the trolley in a predetermined direction again, he must confirm the orientation of the steering wheel in the state before moving. However, since the steering wheel is located on the underside of the mount and difficult to see, it may be difficult to confirm the direction of the steering wheel.

Therefore, when the driver inadvertently operates the travel lever, a problem may occur such as the vehicle traveling in a direction contrary to the driver's intention.

Therefore, if such a trolley malfunctions when traveling in a narrow indoor space or when trying to avoid obstacles, there is a problem in that it can damage the side walls of buildings and sometimes cause serious accidents.

Therefore, the object of this invention is to provide a self-propelled mobile cart that can always return the steering wheels to the front direction of the cart even when the cart is stopped while being rotated.

[Means for Solving the Problems] In order to solve the above problems, this invention provides a bogie in which a plurality of steering wheels and driving wheels are arranged on a mount, and each steering wheel is connected between the steering wheels via a hydraulic cylinder. A direction conversion connecting portion in which the steering wheels are interlocked with each other in the turning direction, and a steering wheel automatic return which automatically returns the steering wheel to face the front of the truck when the steering wheel is stopped in the turning movement state. The configuration includes a control mechanism.

[Function] According to the above configuration, the steering wheels can be freely turned in a predetermined forward and backward direction or in a left and right direction via the direction changing coupling portion in response to the operation of the hydraulic cylinder.

Further, when the steering wheel is stopped in the turning movement state, the steering wheel can always be automatically returned to the front direction of the truck by the operation of the steering wheel automatic return control mechanism.

[Example] Hereinafter, an example in which the self-propelled mobile trolley according to the present invention is applied to high-place work will be described.

FIG. 1 is a plan view showing the configuration of the lower surface of the pedestal, and FIGS. 2 and 3 are a front view and a side view of the cart.

In FIGS. 2 and 3, an elevating mast 3 is slidably provided on two guide masts 2 erected at one end of the upper surface of a pedestal 1 by means of a plurality of guide rollers 4. A stand 5 is also slidably attached via a plurality of guide rollers 6.

When the elevating mast 3 is raised by the elevating hydraulic cylinder 7 erected on the pedestal 1, a chain whose one end is connected to the pedestal 1 side and the other end is connected to the elevating platform 5 via a chain wheel 9 is connected. 8, the lifting platform 5 is configured to rise at twice the speed of the lifting mast 3.

On the lower surface of the frame 1, as shown in FIG. 1, two steering wheels 10 and 11 located at both ends of the front part and two driving wheels 12 located at both ends of the rear part are provided.

The steering wheels 10 and 11 are connected to each other by a direction changing connecting portion 13 so as to be interlocked with each other.

This connecting portion 13 is connected to turning levers 14 and 1 provided on a portion of both steering wheels 10 and 11, respectively.
5 are connected by a connecting rod 16, and a hydraulic cylinder 17 is provided in parallel with the rod 16, one end of which is fixed to a part of the pedestal 1.
It is constructed by connecting one swing lever 14 to the tip of the lever 8.

Therefore, when the driver operates the operation control panel 31 as shown in FIG. 7 provided on the lifting platform 5 and operates the hydraulic cylinder 17, both steering wheels 10 and 11 are operated as shown in FIG. As shown in FIG. 4, the steering wheels 10 and 11 (hereinafter referred to as the steering wheel 10), which draw a running pattern as shown in FIG. has been done.

Further, a directional pivot shaft 21 is provided upright on the upper part of the support fitting 19, and this pivot shaft 21
is pivotally supported by a holding fitting 22 fixed to the frame 1.

A pivot lever 14 is fixed to the pivot shaft 21 to connect the rod 16 of the direction changing coupling section 13 shown in FIG. Therefore, as the turning shaft 21 rotates via the direction changing connecting portion 13, the steering wheels 10, 1
1 turns.

Furthermore, as shown in FIGS. 4 and 5, a part of the steering wheel automatic return control mechanism 29 of the steering wheels 10 and 11, which will be described later, is formed at the upper end of the direction turning shaft 21 on the side of the steering wheel 10. An angle guide cam 23 is provided in which the sensors A and B are brought into contact with each other. The sensors A and B are arranged at a 0 degree position when the steering wheel 10 faces forward.

On the other hand, the drive wheels 12 are attached to both ends of a drive shaft 24 rotatably supported by the pedestal 1. Then, a drive motor 25 is attached to the frame 1.
A pinion gear 26 of the drive motor 25 meshes with a gear 27 fixedly attached to the drive shaft 25, thereby rotating the drive motor 25.

In addition, during the first time, the code 38 is the battery, 3
9 is a hydraulic package as a hydraulic power source.

Hydraulic cylinder 17 and drive motor 2 of drive wheel 12 in the direction changing connection part 13
5, an electric steering wheel steering control mechanism 28, a steering wheel automatic return control mechanism 29, and a driving wheel travel control mechanism 3 as shown in FIG.
Further, an operation control panel 31 for operating the steering control mechanism 28 of the steering wheels 10 and 11 and the travel control mechanism 30 of the drive wheel 12 is provided.

The steering wheel steering control mechanism 28 controls the steering wheels 10 and 1.
Rotating switch SW2 for rotating operation of 1
, electromagnetic valve circuits 32 and 33 for controlling the hydraulic cylinder 17, and drive circuits 34 and 35 for sending output signals to the circuits 32 and 33 by the swing switch SW2.

The drive wheel running control circuit 31 is connected to the drive motor 25
Travel drive control circuit 36 for controlling
and a travel switch SW1 for causing the drive wheels 12 to travel in the longitudinal direction using this circuit 36.

The steering wheel automatic return control circuit 29 functions to automatically return the steering shafts 10 and 11 to the frontal state when the travel switch SW1 becomes neutral and the aircraft stops traveling.

Therefore, the mechanism 29 is operated by the travel switch SW1.
O for determining whether the operation signal is ON or OFF.
R circuit 1 and the running switch SW1 are OFF.
It is composed of an off-delay timer circuit 37 that outputs a signal when F, and an AND circuit 1 and NOR circuits 1 to 3 that send output signals to the drive circuits 34 and 35 based on the output signals of sensors A and B. There is.

Next, the operation of the above embodiment will be explained.

During operation, when the running switch SW1 on the operation control panel 31 shown in FIG. 7 is operated to move forward or backward, the gantry 1 moves forward or backward in any desired direction. At that time, if you want to turn the pedestal 1 in either the left or right direction, for example, to the right, simultaneously operate the turning switch SW2 in the right turning direction.

In this state, the operation signal of the travel switch SW1 is input to the travel drive control circuit, and the drive motor 25 of the drive wheel 12 is rotationally driven.

At the same time, the operation signal of the swing switch SW2 energizes the electromagnetic valve circuit 33 via the drive circuit 35, causing the hydraulic cylinder 17 to turn the steering wheels 10 and 11 to the right via the one-way conversion connecting portion 13. Therefore, when the travel switch SW1 is set to forward, the pedestal 1 moves forward while turning to the right.

In this state, drive switch SW1 is set to neutral (O
FF), the steering wheels 10 and 11 stop in a right-turning state, as shown in FIG.

At this time, the signal detected by sensor A from 0 degrees to 30 degrees to the right and the drive switch SW
The signal from the off-delay timer circuit 37 that is output when 1 is OFF is input to the AND circuit 1.

Then, the output signal of the AND circuit 1 is NO.
The output signal of the NOR circuit 1 is input to the R circuit 1, and the output signal of the NOR circuit 1 is passed through the drive circuit 34 to energize the solenoid valve circuit 32, and the hydraulic cylinder 17 sends the steered wheels 10, 1 via the direction changing connection part 13.
Turn 1 to the left. And the steering wheel 10,1
1 reaches the 0 degree position facing forward, the sensor →B detects this state and stops the signal from the NOR circuit 1, so the electromagnetic valve circuit 32 is de-energized and the steering wheels 10 and 11 are turned to zero. The machine stops at the 100° position and becomes the state shown in Fig. 8a.

In addition, when the steering wheels 10 and 11 stop turning left as shown in FIG. Off-delay timer circuit 37 output by
The signal is input to the NOR circuit 3.

Then, the output signal of the NOR circuit 3 is NO
The output signal of the NOR circuit 2 is input to the R circuit 2, and the output signal of the NOR circuit 2 is applied to the solenoid valve circuit 33 through the drive circuit 35, and the hydraulic cylinder 17 connects the steering wheels 10, 1 through the direction changing connection part 13.
Turn 1 to the right.

Then, the steering wheels 10 and 11 are facing forward.
When the steering wheels 10 and 11 reach the 0 degree position, the sensor B detects this state and stops the signal from the NOR circuit 2, so the electromagnetic valve circuit 33 is de-energized and the steering wheels 10 and 11 are stopped at the 0 degree position. The state is as shown in Figure 8a.

As described above, even when the mount 1 is stopped in either the left or right turning state, the steering wheels 10 and 11 are returned to the state facing the front of the mount 1, and when the mount 1 is stopped, the steering wheels are always turned. Rings 10 and 11 are facing forward.

Therefore, when driving again, the steering wheel 1
There is no need to check each turning position of 0 and 11, and driving operations can be performed easily and safely.

Incidentally, in the above embodiment, the cart was described as being used for high-place work, but the cart according to this invention can be used for various purposes other than high-place work.

[Effects of the Invention As is clear from the above explanation, according to the configuration of the invention, a plurality of steering wheels are connectably connected to each other by a direction changing connection portion using a hydraulic cylinder, and the steering wheels are able to turn. When the vehicle is stopped while moving, the steering wheel automatic return control mechanism is used to automatically return the steering wheel to the front of the trolley, allowing the vehicle to move freely forward or backward or turn left and right. Moreover, when the steering wheel is stopped in a turning movement state, the steering wheel can be automatically returned to the front direction of the truck. Therefore, it is possible to move accurately in narrow spaces.

[Brief Description of the Drawings] Figure 1 is a plan view showing the configuration of the lower surface of the gantry of the self-propelled mobile trolley according to this invention, Figures 2 and 3 are front and side views of the trolley, and Figure 4 is a Figure 5 is a front view showing the configuration of the steering wheel, Figure 5 is a top view of Figure 4, Figure 6 is a control circuit diagram, and Figure 7 is a control panel for operating the circuit in Figure 6. Plan view, Figure 8 a, b, c
FIG. 2 is a plan view showing each steering pattern of the truck. 1... Frame, 10, 11... Steering wheel, 12...
Driving wheel, 13... Direction changing connection part, 17... Hydraulic cylinder, 29... Steering wheel automatic return control mechanism.

Correction: Heisei 4.4/16
Correct the drawing as follows.

Claims (1)

[Scope of utility model registration request] A bogie having a plurality of steering wheels and a plurality of drive wheels disposed on the lower surface of the mount includes a direction conversion connecting portion in which each steering wheel interlocks with each other in a turning direction via a hydraulic cylinder between the steering wheels; 1. A self-propelled mobile trolley, comprising: a steering wheel automatic return braking mechanism that automatically returns the steering wheel to face the front of the truck when the steering wheel is stopped in a turning movement state.