JPH0245073Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a runaway prevention device for a turret-type power carrier having a built-in electric motor.

BACKGROUND OF THE INVENTION Turret-type power carriers have been widely used as vehicles for transporting cargo in the market, various factories, and premises. That is, the turret mechanism 1 shown in FIG. 5 is mounted on the front part of a loading platform equipped with wheels,
A steering handle 2 is rotatably mounted on the upper surface of the turret mechanism 1, and an accelerator ring 3 is disposed concentrically with the steering handle 2. 4 is a direction change lever, neutral (N), forward (F),
It is possible to switch to reverse (R). The power source housed in the turret mechanism 1 includes an electric motor type powered by a battery such as a lead-acid battery, and a type using an internal combustion engine such as an engine, which are used depending on the purpose. When focusing on the electric motor system described above, when operating the vehicle, first turn on the main switch (not shown), move the direction change lever 4 to either forward (F) or reverse (R), and push the accelerator ring 3 downward. move. Then, the electric motor starts and the vehicle starts running. At this time, the driving speed is controlled only by pushing the accelerator ring 3, so the driver operates the steering wheel 2 and controls the speed by freely adjusting the pushing force of the accelerator ring 3. ing. Usually, an electric motor is a DC motor controlled by a resistance controller or an SCR chopper controller, and the power taken from the output shaft of the DC motor is driven through a reduction gear and a chain connected to the reduction gear. It is configured to transmit information to the wheels.

Problems to be solved by the invention Due to the nature of its use, such conventional turret-type electric powered transport vehicles require agile movement above all else, so ease of operation is an essential condition. The vehicle can be driven only by operating the direction change lever 4, accelerator ring 3, and steering handle 2. Therefore, while it is convenient for driving in crowded markets, it is distracting due to the busyness of work.
If the direction change lever 4 is not returned to the neutral (N) position when stopped, or if the main switch is forgotten to be turned off,
Or, people often forget to apply the handbrake installed at their feet. Therefore, instruction manuals, etc.
Although the warning clearly states that when stopping, apply the handbrake, set direction change lever 4 to neutral (N), and turn off the main switch,
In actual work, workability is strongly required, and in an environment with many obstacles, it is often not protected. The reality is that it is. Therefore, when loading and unloading cargo, a third party may accidentally push the accelerator ring 3 or carelessly place the cargo on the steering accelerator ring 3. In such cases, the electric motor may start and the transport vehicle may run out of control, so caution should be taken when driving.

Therefore, the present invention solves the problems that conventional turret type electric power carriers have, and
The object of the present invention is to provide a rational and effective device that can prevent the occurrence of runaway vehicle accidents caused by the aforementioned carelessness.

Means for Solving the Problems In order to achieve the above object, the present invention is equipped with a steering handle rotatably mounted on the top surface of a turret mechanism that incorporates an electric motor that is started by a starter battery. In a configuration in which an accelerator ring is disposed concentrically with the steering handle, a tape-shaped pressure-sensitive switch is attached to a predetermined part of the steering handle, which is energized by a pressing operation by the passenger's hand, and the starting battery and electric An internal relay is connected between the motor and the electric motor when the pressure-sensitive switch is grasped and the accelerator switch is pressed to start the electric motor. A motor starting circuit comprising a safety module and a safety module for maintaining the operating state of the internal relay is disposed within the motor.

Effects According to the present invention having the above configuration, when driving, the driver gets in the car, turns on the main switch, and
When the direction change lever is moved forward or backward, the accelerator ring is pushed, and the driver's hand grasps the steering wheel, the tape-shaped pressure-sensitive switch attached to the steering wheel is energized. At the same time, the accelerator switch is turned on, the internal relay of the safety module is activated, and battery power is supplied to the electric motor to start the vehicle. After starting the vehicle, the electric motor continues to rotate even if the pressure-sensitive switch is not gripped at all times. In addition, even if the accelerator switch is turned off by stopping pressing the accelerator ring while driving, the internal relay of the safety module remains activated within the arbitrary set time. Restart with only Furthermore, if the predetermined time period or more elapses during loading and unloading of cargo, the electric motor can be restarted by grasping the pressure sensitive switch again and pushing the accelerator ring.

Embodiment An embodiment of the runaway prevention device for a turret type electric power carrier according to the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the device of the present invention, and FIG. 2 is a side view of the same. A steering handle 2 is rotatably mounted on the top surface of a turret mechanism 1, and an accelerator ring is provided concentrically with the steering handle 2. Place 3. Reference numeral 4 denotes a direction changing lever, which, as before, allows switching to the neutral position, forward position, and reverse position. A predetermined portion of the steering handle 2, in the illustrated example, on the inner peripheral surface of the steering handle 2,
A tape-like pressure sensitive switch 5 is attached. This pressure-sensitive switch 5 is stretched over an appropriate length on the inner circumferential surface of the steering handle 2, and preferably extends from at least 1/4 of the inner circumferential surface of the steering handle 22 as shown in the illustrated example. It is stretched over the entire circumferential surface (see the cross-sectional view in FIG. 3). The above-mentioned pressure-sensitive switch 5 is usually made of special vinyl, and has a switch element in which a hardened spring material is insulated at both ends of a copper-plated conductor, and is bent into a cylindrical shape. Since the pressure sensitive switch 5 is flexible, the pressure sensitive switch 5 can be attached to the inner circumferential surface of the steering handle 2 using an adhesive, double-sided tape, formed channel, or the like. Further, when a part of the human body or another object comes into contact with a part of the pressure-sensitive switch 5, it becomes electrically conductive, and when there is no such contact, it becomes an insulator.

FIG. 4 shows an example of a circuit diagram of a resistive speed control device for an electric power carrier equipped with such a pressure-sensitive switch 5. 6 is a battery, 7 is a main switch, and a safety module 9 having an internal relay 8 and a battery 10 for driving the relay are arranged between the main switch 7 and the pressure-sensitive switch 5. 11 is a relay for forward movement, and 12 is a relay for reverse movement, which connects the direction change lever 4 to the forward switch 4.
a and a reverse switch 4b. 13 is an accelerator switch for 1st speed, 14 is an accelerator switch for 2nd speed, 15 is an accelerator switch for 3rd speed, 16 is a relay for 2nd speed, and 17 is a relay for 3rd speed. On the other hand, 19 is a DC motor,
It is composed of a field coil 18, an armature, etc. 20 indicates a speed switching resistor. This speed switching resistor 20 consists of a first speed resistor R1 and a second speed resistor R2. 16a is a 2nd speed relay contact, and 17a is a 3rd speed relay contact, which are interlocked with the 2nd speed relay 16 and the 3rd speed relay 17, respectively. Incidentally, a motor starting circuit 21 is constituted by the pressure sensitive switch 5, the safety module 9, and the internal relay 8 described above.

The operation of the device of the present invention having such a configuration will be explained below. When starting the transport vehicle, the driver first turns on the main switch 7, operates the direction change lever 4, and turns on either the forward switch 4a or the reverse switch 4b. Next, the driver manually presses the pressure-sensitive switch 5 attached to the steering wheel 2, and at the same time operates the accelerator ring 3 to turn on the 1st gear accelerator switch 13. The safety module 9 then becomes energized and the internal relay 8 turns on.

Next, operate the accelerator ring 3 to turn on the 1st speed accelerator switch 13. Now, if we consider the case where the forward switch 4a is turned on by operating the direction change lever 4, the forward relay 11a is switched in the direction of arrow A by the operation of the forward relay 11, and the current in the battery 6 is turned on. The current flows through the field coil 18 in the direction of arrow B via the first speed resistor R1, and the DC motor 19 rotates in the forward direction of the transport vehicle. Next, when the driver turns on the 2nd speed accelerator switch 14 by pressing the accelerator ring 3, the 2nd speed relay contact 16a is turned on by the operation of the 2nd speed relay 16, and the current in the battery 6 is reduced to 2. The field coil 18 is connected to the field coil 18 via the speed relay contact 16a and the second speed resistor R2.
flows in the direction of arrow B, and the rotation of the DC motor 19 increases. Similarly, by pressing the accelerator ring 3,
When the speed accelerator switch 15 is turned on, the third speed relay 17 is activated and the third speed relay contact 17 is turned on.
a is turned on, the current of the battery 6 flows directly through the field coil 18 in the direction of arrow B, and the DC motor 1
Rotation number 9 is the fastest. Next, suppose that the driver turns on the reverse switch 4b by operating the direction change lever 4, the operation of the reverse relay 12 switches the reverse relay contact 12a in the direction of arrow D, and the battery 6 is turned on. The current flows through the field coil 18
flows in the direction of arrow C, and the DC motor 19 rotates in the backward direction of the transport vehicle. Accelerator ring 3 at this time
Suppression of the speed accompanying the pushing movement is performed in the same manner as described above.

During the above operation, it is not necessary to hold the pressure-sensitive switch 5 all the time while the transport vehicle is running, and the internal relay 8 is activated by the action of the safety module 9.
Since this remains on, the transport vehicle can continue to travel only by pressing the accelerator ring 3 and rotating the operating handle 2. Furthermore, even if you stop pressing the accelerator ring 3 while driving and stop, the internal relay 8 will remain on for a predetermined period of time due to the action of the safety module 9, and when starting, the accelerator ring 3 will remain on. It is possible to perform the starting operation only by pushing the button.

On the other hand, when the predetermined set time elapses while the transport vehicle is stopped and loading/unloading cargo, the internal relay 8 is turned off, the motor control circuit is not configured, and only the accelerator ring 3 is pushed. Eventually, the vehicle will be unable to start. In this case, if the driver grasps the pressure-sensitive switch 5 of the steering wheel 2 again and presses the accelerator ring 3, the DC motor 19 can be restarted in the same manner as described at the time of activation. Therefore, even if the main switch 7 and the direction change lever 4 are in the ON state, the carrier vehicle will not start by simply pushing the accelerator ring 3, so that the carrier vehicle is prevented from running out of control.

Effects of the Invention As explained above, according to the runaway prevention device for a turret-type electric power carrier according to the present invention, a steering handle is rotatably mounted on the top surface of a turret mechanism that incorporates an electric motor driven by a battery. A tape-shaped pressure-sensitive switch is attached to a predetermined portion of the steering handle in a configuration in which an accelerator ring is disposed concentrically with the steering handle, and a tape-shaped pressure-sensitive switch is attached to a predetermined part of the steering handle. An internal relay between the battery and the electric motor activates the electric motor when the pressure-sensitive switch is grasped and the accelerator ring is pressed, but even if the accelerator switch is no longer pressed, any settings can be made. Since a motor starting circuit is provided, which includes a safety module that maintains the operating state of the internal relay within a certain period of time, the following effects can be obtained. That is, when starting the vehicle, the driver stands in the cab and turns on the main switch while also grasping the steering wheel, which energizes the pressure-sensitive switch and turns on the internal relay of the safety module. In addition to being able to start the DC motor, there is no need to constantly press the pressure-sensitive switch while driving due to the action of the safety module, making driving operations more complicated than before. Therefore, the transport vehicle can be easily driven. Furthermore, even if the vehicle stops during driving, the internal relay remains on for a predetermined period of time, and when the vehicle starts, the vehicle can be started simply by pressing the accelerator ring. Additionally, if a predetermined amount of time elapses while the driver is loading and unloading the vehicle, the internal relay will be turned off by the action of the safety module, allowing a third party to press the accelerator ring. Even if a load is placed on the accelerator ring, the carrier does not start, and runaway is prevented. Therefore, even if you inadvertently forget to turn off the main switch or forget to apply the handbrake when the vehicle is stopped, there is no possibility that the vehicle will run out of control.
This has the advantage of increasing safety in crowded places such as markets or campuses.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is the same side view, Figure 3 is a sectional view taken along the line - - in Figure 1, Figure 4 is a circuit diagram for rotating the motor as a power source, and Figure 5 is an example of a conventional turret type power carrier. FIG. 1... Turret mechanism, 2... Steering handle 2, 3... Accelerator ring, 4... Direction change lever, 4a... Forward switch, 4b... Reverse switch, 5... Pressure sensitive switch, 6... Battery ,7...
...Main switch, 8...Internal relay, 9...Safety module, 10...Battery, 11...
...Relay for forward movement, 12...Relay for backward movement, 13...
... Accelerator switch for 1st speed, 14... Accelerator switch for 2nd speed, 15... Accelerator switch for 3rd speed, 16... Relay for 2nd speed, 17... Relay for 3rd speed, 16a... Relay contact for 2nd speed, 17a...3
Speed relay contact, 18...Field coil, 19...
DC motor, 20...Speed switching resistor, 21...
...Motor starting circuit.

Claims (1)

[Scope of utility model registration request] A turret-type electric power system having a structure in which a steering handle is rotatably mounted on the top surface of a turret mechanism that incorporates an electric motor driven by a battery, and an accelerator ring is arranged concentrically with the steering handle. In the transport vehicle, a tape-shaped pressure-sensitive switch is attached to a predetermined portion of the steering handle, and is energized by a pressing operation by a passenger, and further between the battery and the electric motor,
When the pressure-sensitive switch is held and the accelerator switch is pressed, the internal relay is activated to start the electric motor, but even if the accelerator switch is no longer pressed, the internal relay does not activate within an arbitrary set time. A runaway prevention device for a turret-type electric power carrier, characterized by having a motor starting circuit comprising a safety module that maintains the state.