JP3664887B2 - Cab-over type vehicle entry / exit device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is used in automobiles. The present invention is used as an auxiliary device that is convenient for a driver to get on and off a driver's seat of a cab-over type vehicle. The present invention relates to a device suitable for use by mildly handicapped persons.
[0002]
[Prior art]
An auxiliary device for this type of driver to get on and off the cab-over type vehicle is disclosed in Japanese Patent Application No. 10-53859. This is a device as illustrated in FIG. 2, and is an auxiliary device for raising and lowering for a driver to get on and off a driver seat at a high position. That is, in general, in order to get on and off a large cab-over type vehicle, it is necessary to perform a physical motion such that a handle provided at the driver's seat entrance / exit is strongly held and the body is lifted to the driver's seat by the force of the arm. For this purpose, arm strength to support weight, particularly suspension force is required. Furthermore, it is necessary to perform an exercise motion that skillfully twists the body according to the movement of the legs and arms while grasping this handle.
[0003]
On the other hand, in recent years, there are many drivers who have become mildly disabled due to traffic accidents and other causes, with slight disabilities on the arms and waist. Some of these people say that it is inconvenient to get on and off the driver seat of a large vehicle, although there is no obstacle to driving a large vehicle physically and skillfully. For this reason, there are those who have to give up their occupations that have been experienced so far. For this purpose, an apparatus as illustrated in FIG. 2 has been developed and provided.
[0004]
This device is a small-sized lifting device for loading and unloading cargo on a lorry so that it is suitable for a person to go up and down. An electric lifting device is provided outside the driver's seat 20. Step 3 moves up and down electrically according to the button operation.
[0005]
That is, a driver who uses this approaches the driver's seat from the outside, opens the passenger door 30 by the force of his arm, and operates the first switch 11 to descend. Thereby, step 3 is projected from the storage position to the lowering position shown in the figure. When the driver changes to Step 3 and operates the second switch 12 to raise, Step 3 slowly rises. During this time, the driver holds the handrail 55 with the left hand and the grip 37 with the right hand. When step 3 rises to the highest position, step 3 automatically stops. As a result, the driver can change to the driver's seat without taking a complicated posture. Thereafter, step 3 can be returned to the storage position by operating the third switch 13 provided on the instrument panel 38 of the cab illustrated in FIG.
[0006]
When exiting from the driver's seat 20, the third switch 13 is operated to move step 3 to the raised position, the driver moves to step 3, and the second switch 12 is operated to lower step 3. When the descent position is reached, the driver can get off the road surface. Thereafter, when the first switch 11 is operated to be raised, the step 3 is stored in a storage position that does not hinder travel. By using this device, the driver can easily get on and off the driver's seat without lifting his / her body weight with his / her arm force and without moving his body.
[0007]
[Problems to be solved by the invention]
The inventors of the present application repeated the test of the apparatus as shown in FIG. When the control circuit of the step elevating device breaks down for some reason, it was decided to consider the possibility that the step would remain lowered or raised and the vehicle would be virtually impossible to travel. The control circuit of the step elevating device is constituted by a large number of semiconductor circuits or relay circuits and software, and it is impossible to completely eliminate the failure of what is designed and manufactured so that there is no failure.
[0008]
The present invention is made in such a background, and even if a failure occurs in the control circuit of the step lifting device, the control circuit is bypassed by emergency operation and the step of the lifting device is accommodated in the storage position. It is an object of the present invention to provide an apparatus that can do this. It is an object of the present invention to provide a device that takes into consideration that a vehicle does not become unable to travel on the road due to a failure of the lifting device.
[0009]
[Means for Solving the Problems]
The present invention is provided with circuit means for temporarily storing the vehicle by the operation and allowing the vehicle to run when the step of the step lifting device mounted on the cab over type vehicle is protruding and becomes unstorable. It is characterized by.
[0010]
That is, the present invention provides a first electric motor that moves a step provided at the entrance / exit of a driver's seat horizontally to a storage position and a use position, and a second motor that moves the step vertically to a lowering position and a rising position. In a cab over type vehicle boarding / alighting device comprising: a motor of claim 1; a plurality of operation switches; and a control circuit that takes in the states of the plurality of switches and drives and controls the first motor and the second motor. Separately, first and second emergency switches are provided, one end of each of the first and second emergency switches is connected to the positive electrode of the power supply, and the other end of the first emergency switch is connected to the first emergency switch. Other than the first backflow prevention diode connected directly to the circuit that drives the motor in the retracted direction (meaning that the control circuit is bypassed, the same applies hereinafter), the second emergency switch A second backflow prevention diode that is directly connected to a circuit that drives the first motor in the retracted direction, and a circuit that drives the second motor in the upward direction at the other end of the first emergency switch. A third backflow prevention diode that is directly connected; and a fourth backflow prevention diode that directly connects the other end of the second emergency switch to a circuit that drives the second electric motor in a descending direction. It is characterized by that.
[0011]
Normally, the step moving operation is performed under the control of the control circuit. That is, the control circuit drives the first motor according to the instruction signals input from the plurality of operation switches, moves the step horizontally to the use position and the storage position, and drives the second motor to lower the step. Move up and down to position and lift position.
[0012]
When a failure occurs in the control circuit that controls the movement of such a step and the step is in the use position and cannot be stored, the first emergency switch and the second emergency switch are operated. By doing so, the protruding step is moved from the use position to the storage position, so that the vehicle can run.
[0013]
For example, if the step becomes unstorable on the descending end side, the first backflow prevention diode is connected to the circuit that drives the first motor in the storing direction of the step by operating the first emergency switch. A power supply is connected via the third, and at the same time, a power supply is connected via a third backflow prevention diode to a circuit that drives the second motor in the upward direction of the step. Since one end of the first emergency switch is connected to the positive electrode of the power source, the first electric motor and the second electric motor are driven by this, and the step protruding to the descending end side is moved to the storage position and accommodated. be able to.
[0014]
In addition, when the step becomes unstorable at the ascending end side, the second emergency switch is turned on to prevent the second backflow in the circuit that drives the first motor in the step storing direction. A power supply is connected via a diode for power supply, and at the same time, a power supply is connected via a fourth backflow prevention diode to a circuit for driving the second motor in the step-down direction. One end of this second emergency switch is also connected to the positive electrode of the power supply, so that the first motor and the second motor are driven, and the step protruding to the rising end side is moved to the storage position. Can be accommodated.
[0015]
In this way, even if a failure occurs in the control circuit of the step lifting device, the step of the lifting device can be accommodated in the storage position by bypassing the control circuit by operating the emergency switch. It is possible to avoid that the vehicle cannot travel on the road.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
[0017]
【Example】
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing a configuration of a main part of an embodiment of the present invention, FIG. 2 is a partial perspective view showing a mechanical configuration of a vehicle equipped with a boarding / alighting device according to the embodiment of the present invention, and FIG. 3 is an embodiment of the present invention. It is a fragmentary perspective view in the driver's seat of the vehicle provided with the boarding / alighting apparatus concerned.
[0018]
In the embodiment of the present invention, the first electric motor 1 that horizontally moves the step 3 provided at the entrance / exit of the driver's seat 20 to the retracted position and the use position, and the second electric motor 1 that moves the step 3 up and down to the lowered position and the raised position. The motor 2, a plurality of operation switches, and a control circuit (not shown) that takes in the states of the plurality of operation switches and drives and controls the first motor 1 and the second motor 2 are provided. The plurality of operation switches are seated on the first switch 11 provided at a position where it can be operated from outside the vehicle with the passenger door 30 opened, the second switch 12 that can be operated by a person standing in step 3, and the driver's seat 20. A third switch 13 that can be operated in the state and other switches are included.
[0019]
Further, as a feature of the present invention, a first control including a first emergency switch 21 and a second emergency switch 22, a retracting direction driving circuit 24 and a protruding direction driving circuit 27 separately from the operation switch. A relay 41 and a second control relay 42 constituted by the ascending direction driving circuit 25 and the descending direction driving circuit 26 are provided. As shown in FIG. 2, the first emergency switch 21 and the second emergency switch 22 are arranged on the side of the driver's seat 20 and are covered with a cover 28 so as not to be normally operated.
[0020]
As a circuit configuration, one end of the first emergency switch 21 and the second emergency switch 22 is connected to the positive electrode of the power source 23, and the other end of the first emergency switch 21 stores the first electric motor 1. The other back end of the first backflow prevention diode 31 and the second emergency switch 22 are connected to the storage direction drive circuit 24 by bypassing the control circuit (not shown) and directly connected to the storage direction drive circuit 24 for driving in the direction. A second backflow prevention diode 32 that is directly connected and a third backflow prevention diode that directly connects the other end of the first emergency switch 21 to a rising direction drive circuit 25 that drives the second motor 2 in the upward direction. A diode 33 and a fourth backflow prevention diode 34 that directly connects the other end of the second emergency switch 22 to a descending direction driving circuit 26 that drives the second electric motor 2 in the descending direction are provided.
[0021]
Next, the operation of the embodiment of the present invention thus configured will be described.
[0022]
When step 3 is not retractable at the lower end, the first emergency switch 21 is turned on. When the first emergency switch 21 is turned on, the power source 23 is connected to the exciting coil of the storage direction drive circuit 24 via the first backflow prevention diode 31 and the switch is switched. The power source 23 is connected to the exciting coil of the upward drive circuit 25 via the backflow prevention diode 33, and the switch is switched.
[0023]
As a result, the current from the power source 23 is supplied to the first electric motor 1 and the second electric motor 2, the first electric motor 1 is rotationally driven in the direction in which step 3 is stored, and the second electric motor 2 is step 3. It is driven to rotate in the direction of raising. Step 3 is moved up in the horizontal direction by the drive of the first electric motor 1 while being lifted up by the drive of the second electric motor 2 and is drawn into the vehicle body and stored.
[0024]
Similarly, when it becomes impossible to move at the intermediate position on the descending end side during the ascending operation of Step 3, the first emergency switch 21 is turned on, so that Step 3 drives the second electric motor 2. The first electric motor 1 is driven to move horizontally toward the storage end while being raised. In this case, since Step 3 starts to move from the intermediate position on the descending end side, there is a time lag between reaching the vertical storage position and reaching the horizontal storage end in Step 3, Since an allowable range is provided at the storage position, step 3 can move to the end in the horizontal direction within this allowable range.
[0025]
When step 3 becomes unstorable at the rising end, the second emergency switch 22 is turned on. When the second emergency switch 22 is turned on, the power source 23 is connected to the exciting coil of the retracting direction drive circuit 24 via the second backflow prevention diode 32 and the switch is switched. The power source 23 is connected to the exciting coil of the descending direction drive circuit 26 via the backflow prevention diode 34, and the switch is switched.
[0026]
As a result, the current from the power source 23 is supplied to the first electric motor 1 and the second electric motor 2, the first electric motor 1 is rotationally driven in the direction in which step 3 is stored, and the second electric motor 2 is step 3. Is driven to rotate downward. Step 3 is moved downward in the horizontal direction by the drive of the first electric motor 1 while being lowered by the drive of the second electric motor 2 and is drawn into the vehicle body and stored.
[0027]
Even when the movement becomes impossible at the intermediate position on the ascending end side during the descending operation of Step 3, by similarly turning on the second emergency switch 22, Step 3 is directed toward the storage end while descending. Move horizontally. In this case as well, since Step 3 starts moving from the intermediate position on the rising end side, there is a time lag between the arrival of the vertical storage position in Step 3 and the arrival of the horizontal storage end. It moves to the end in the horizontal direction within the allowable range set in the direction storage position and is accommodated.
[0028]
The first control relay 41 shown in FIG. 1 incorporates a protruding direction drive circuit 27. However, the present invention is intended for storing in step 3 where the protruding control circuit 41 has been protruded and cannot be moved. The operation by the protruding direction driving circuit 27 is not performed.
[0029]
Here, the boarding / alighting device according to the embodiment of the present invention will be described. FIG. 4 is a block diagram showing an electrical configuration of the boarding / alighting device according to the embodiment of the present invention.
[0030]
This boarding / exiting device is provided with a control circuit 6 that takes in the states of a plurality of operation switches and drives an ascending / descending mechanism and a retracting mechanism. The control circuit 6 includes a door switch 10 that detects the open state of the entrance / exit door 30, The first switch 11 provided at a position that can be operated from the outside of the vehicle with the passenger door 30 opened, the second switch 12 provided at a position that can be operated by standing in step 3, and the operation performed while sitting on the driver's seat 20 A third switch 13 that can be seated, a seat switch 14 that detects the seating of the driver, an upper limit switch 15 that detects that Step 3 has reached the rising end, and a lower limit switch that detects that Step 3 has reached the falling end 16. Position switch 17 that detects that Step 3 has reached the storage position, and a projecting switch that detects that Step 3 has protruded to the use position. Ttosuitchi 18, and Step 3 is the output of the storing limit switch 19 for detecting that it has been stored is connected.
[0031]
The first switch 11, the second switch 12, and the third switch 13 are composed of an upper button and a lower button that instruct the ascending, descending, protruding, and storing in Step 3.
[0032]
From the control circuit 6, a first control relay 41 that controls the protruding or storing of the step 3 by the first motor 1, and a second control that controls the rising or lowering of the step 3 by the second motor 2. A control signal is sent to the relay 42.
[0033]
In normal times, the control circuit 6 takes in the outputs from the plurality of operation switches, and drives the ascending / descending mechanism and the storage mechanism in accordance with the operation instructions to perform the movement of step 3.
[0034]
First, the operation when the driver gets on will be described. When the passenger door 30 is opened from the closed state, the door switch 10 is turned on. The control circuit 6 is activated by this ON signal. When the lower button of the first switch 11 is operated by the driver, the control circuit 6 switches the switch of the protruding direction drive circuit 27 of the first control relay 41, and the first switch 11 is switched. The motor 1 is driven to rotate in the direction in which step 3 protrudes.
[0035]
When the first electric motor 1 is driven and step 3 is started and the protruding limit switch 18 is turned off, the control circuit 6 stops the driving of the first electric motor 1 by this off signal, and the second control relay 42. The second electric motor 2 is rotationally driven in the direction in which the step 3 is lowered. When step 3 reaches the lowered position and the lower limit switch 16 is turned off, the control circuit 6 stops driving the second electric motor 2 by this off signal.
[0036]
Here, when the driver takes step 3 and the upper button of the second switch 12 is operated, the control circuit 6 switches the switch of the upward drive circuit 25 of the second control relay 42, and the second switch 12 is switched. The motor 2 is driven to rotate in the direction in which step 3 rises. When step 3 reaches the ascending position, the upper limit switch 15 is turned off. The control circuit 6 stops the driving of the second electric motor 2 by this off signal.
[0037]
The seat switch 14 is turned on when the driver moves to the driver's seat 20 from the step 3 that has reached the raised position and is seated. With this output, the control circuit 6 enables the third switch 13 that is seated and operated while the first switch 11 is enabled. When the lower button of the third switch 13 is operated, the control circuit 6 switches the lower direction driving circuit 26 of the second control relay 42 and the step 3 of the second motor 2 is lowered. Rotate in the direction.
[0038]
When step 3 descends and reaches the storage position, the position switch 17 is turned on. At this time, since the door switch 10 and the seat switch 14 are in the ON state and the condition for storing step 3 is satisfied, the control circuit 6 stops driving the second electric motor 2 and the first control relay 41 The switch of the storage direction drive circuit 24 is switched, and the first electric motor 1 is rotationally driven in the direction in which step 3 is stored. When step 3 is stored, the storage limit switch 19 is turned off, and the control circuit 6 stops driving the first electric motor 1 by this off signal.
[0039]
When the driver gets off, the reverse operation for getting on and off is performed. When the driver opens the passenger door 30 while sitting on the driver's seat 20, the door switch 10 is turned on and the control circuit 6 is activated.
[0040]
Here, when the third switch 13 is operated, the control circuit 6 switches the switch of the protruding direction drive circuit 27 of the first control relay 41, and at the same time the step 3 is started by the first electric motor 1. The switch of the ascending direction driving circuit 25 of the second control relay 42 is switched, and step 3 is raised by the second electric motor 2.
[0041]
When the driver moves to Step 3 that has reached the ascending position and the lower button of the second switch 12 is operated, Step 3 descends and stops at the descending position. When the driver goes down from step 3 and the upper button of the first switch 11 is operated, step 3 is raised by the second electric motor 2 and stopped at the storage position, stored by the first electric motor 1, The electric motor 1 is stopped by an OFF signal of the retract limit switch 19.
[0042]
【The invention's effect】
As described above, according to the present invention, when the control circuit of the step lifting device equipped in the cab over type vehicle has failed and the step is protruding, the emergency switch is operated. Thus, the step can be moved to and stored in the storage position, and it is possible to avoid the situation where the vehicle cannot run on the road due to the failure of the lifting device.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a configuration of a main part of an embodiment of the present invention.
FIG. 2 is a partial perspective view showing a mechanical configuration of a vehicle including a boarding / alighting device according to an embodiment of the present invention.
FIG. 3 is a partial perspective view of the inside of a driver's seat of a vehicle provided with a boarding / alighting device according to an embodiment of the present invention.
FIG. 4 is a block diagram showing an electrical configuration of a boarding / alighting device according to an embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 1st motor 2 2nd motor 3 Step 5, 55 Handrail 6 Control circuit 10 Door switch 11 1st switch 12 2nd switch 13 3rd switch 14 Seat switch 15 Upper limit switch 16 Lower limit switch 17 Position Switch 18 Projection limit switch 19 Storage limit switch 20 Driver's seat 21 First emergency switch 22 Second emergency switch 23 Power supply 24 Storage direction drive circuit 25 Ascent direction drive circuit 26 Lower direction drive circuit 27 Projection direction drive circuit 28 Cover 30 Entrance door 31 First backflow prevention diode 32 Second backflow prevention diode 33 Third backflow prevention diode 34 Fourth backflow prevention diode 37 Grip 38 Instrument panel 41 First control relay 42 First Second control Lumpur relay

Claims (1)

A first electric motor (1) for moving a step provided at the entrance / exit of the driver's seat horizontally to a storage position and a use position, and a second for moving the step (3) vertically to a lowering position and an ascending position. Motor (2) , a plurality of operation switches, and a control circuit (6) that takes in the states of the plurality of operation switches and controls the driving of the first motor (1) and the second motor (2). In a cab over type vehicle boarding / exiting device,
A first emergency switch (21) and a second emergency switch (22) for operating the first electric motor and the second electric motor to move the step to the storage position when the control circuit fails. Is installed in the driver ’s seat,
When the switch is operated, the first emergency switch (21) drives the first electric motor (1) to drive the current from the power source (23) to move the step in the storage direction. Supplying the circuit (24) with current to the ascending direction driving circuit (25) for driving the second electric motor (2) to move the step in the ascending direction;
When the switch is operated, the second emergency switch (22) drives the first electric motor (1) to drive the current from the power source (23) to move the step in the storage direction. A cabover type vehicle characterized by supplying current to a descent direction drive circuit (26) that supplies the circuit (24) and drives the second electric motor (2) to move the step in the descent direction . Boarding equipment.

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