JP2004195039A - Care lifter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a conventional lifter is comparatively expensive, often has a fault due to oil leakage and requires professional knowledge and apparatus for the maintenance of it since the conventional lifter vertically moves a moving part by using a hydraulic motor. <P>SOLUTION: The caring lifter is constituted to switch and connect switching switches 12 and 13 to the side of contacts 12b and 13b by manually operating the switches 12 and 13 in order to lower the moving part. Thus, a motor brake circuit 16 is energized to release braking to a DC motor 11. As the result of this, the moving part where a wheelchair in the state of loading a physically handicapped is fixed and placed starts moving down with its dead weight, and the DC motor 11 is reversely rotated with moving down of this moving part to operate as a generator. Current generated by the DC motor 11 operating as the generator at this time is thermally discharged by resistors R1 and R2. As the result of this, the velocity of moving down of the moving part is reduced. In the case of moving up, the driving motor 11 is driven to move the moving part up. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a care lifter, and more particularly, to a care lifter of a wheelchair lift car that moves with a wheelchair mounted thereon.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a wheelchair lift car capable of moving a physically handicapped person to an arbitrary place with the wheelchair mounted on a car has been known. In this wheelchair lift car, when the wheelchair is put on, the wheelchair with the disabled person is put on the nursing lifter at the ground position and fixed, then the nursing lifter is raised to a predetermined height position, and then the height is raised. The wheelchair is housed in the wheelchair lift car together with the care lifter by making a half turn at the position.
[0003]
Also, when getting off, after turning the above-mentioned care lifter fixing the wheelchair with the physically handicapped person a half turn, lower the care lifter to the ground, and release the fixation of the wheelchair from the ground to the care lifter. In addition, only a wheelchair with a physically handicapped person can be moved to an arbitrary place.
[0004]
[Problems to be solved by the invention]
However, the nursing lifter in the wheelchair lift car described above is relatively expensive because the hydraulic motor is used to move up and down conventionally using a hydraulic motor. There is a problem. In addition, maintenance of the care lifter also requires technical knowledge and equipment because the ascending / descending motor is a hydraulic motor, and there is also a problem that maintenance such as failure repair cannot be easily performed. Further, there is a problem that the sound is loud and does not operate normally in a cold region.
[0005]
The present invention has been made in view of the above points, and has as its object to provide a care lifter having a low-cost configuration.
[0006]
It is another object of the present invention to provide a care lifter that can easily perform maintenance without having a high level of specialized knowledge.
[0007]
Still another object of the present invention is to provide a care lifter that operates normally even in a cold region.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a support portion fixed at a predetermined position of a wheelchair lift car moving with a wheelchair mounted thereon, and a predetermined range along a support portion with a wheelchair mounted. A moving part that moves up and down, a DC motor that operates as a motor when the moving part rises and rises the moving part, and that operates as a generator when the moving part descends, and instructs the moving part to move up or down or stop. A manual switch and a motor brake circuit that is de-energized to apply a brake to stop the rotation of the DC motor when instructed to stop by the switch, and energized to release the brake when instructed to raise or lower by the switch; When the switch is instructed to ascend, a drive signal for rotating the DC motor in the forward direction is supplied. When the switch is instructed to descend or stop, the DC motor is driven. It constitutes a closed circuit comprising a resistor is obtained by a configuration having a switching circuit for stopping the supply of the drive signal to the DC motor.
[0009]
According to the present invention, when the lowering is instructed by the switch, the direct-current motor is rotated in a direction opposite to that at the time of ascending due to the lowering of the moving part due to the weight of the moving part to operate as a generator, and a signal generated from the generator is resistance It is characterized by lowering the descending speed by thermal discharge. When the switch is instructed to ascend, the drive signal is supplied to the DC motor to rotate the DC motor forward to raise the moving unit. Therefore, according to the present invention, the DC motor is driven only when the moving part is raised, and the DC motor is operated as a generator when the moving part is lowered. Therefore, it can be configured at a low cost and with a minimum number of circuit components. .
[0010]
Further, in order to achieve the above object, the present invention detects that the moving section has risen to a predetermined first height position, configures a switching circuit to form a closed circuit at the time of the detection, and configures a motor brake circuit. An upper end detection limit switch for de-energizing, and a lower end detection limit switch for de-energizing the motor brake circuit upon detecting that the moving section has dropped to the predetermined second height position and detecting the lowering. It is characterized by having.
[0011]
According to the present invention, even if the switch is not manually stopped, when the moving portion has risen to the predetermined first height position, the upper end detection limit switch operates to supply the drive signal to the DC motor. At the same time as stopping, the DC motor can be automatically stopped by applying a brake to the DC motor by the motor brake circuit, and the lower end detection limit switch operates when the moving part descends to the predetermined second height position. Then, the DC motor can be automatically braked by the motor brake circuit.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an electric circuit diagram of an embodiment of a main part of a care lifter according to the present invention. In FIG. 1, a DC motor 11 is a moving unit lifting motor with a motor brake MB that operates on a DC power supply 12V. The changeover switches 12 and 13 are manual changeover switches that are switched in conjunction with each other. The changeover switches 12 and 13 are connected to the contacts 12a and 13a when the care lifter is raised, and are connected to the contacts 12b and 13b when the care lifter is lowered. It is in the neutral position shown, not connected to any of the contacts 12a, 12b, 13a and 13b. When the switches 12 and 13 are released, they automatically return to the neutral position.
[0013]
The changeover switch 12 has a contact 12a connected to one end of each of the relay coils CR1, CR2, and CR3 via the upper end detection limit switch 14, and a common contact of the changeover switch 13. It is connected to a motor brake circuit 16 via a lower end detection limit switch 15. The upper end detection limit switch 14 is a normally closed switch that is turned off when the care lifter rises to a predetermined upper end position. On the other hand, the lower end detection limit switch 16 is configured so that the care lifter reaches the predetermined lower end position. It is a normally closed switch that is turned off when it descends.
[0014]
Also, during the period when the relay coil CR1 is energized, the relay switch SCR1 is switched and connected to the contact side indicated by a white circle. Similarly, during the period when the relay coil CR2 is energized, the relay switch SCR2 is switched and connected to the contact side indicated by a white circle, and during the period when the relay coil CR3 is energized, the relay switch SCR3 is switched to the contact side indicated by a white circle. Is switched and connected. The motor brake circuit 16 applies a brake to the DC motor 11 only during the non-energized period to stop the rotation.
[0015]
Further, one of the two drive terminals of the DC motor 11 is connected to the common contact of the relay switch SCR3, the normally closed contact (shown by a black circle), the common contact of the relay switch SCR1 and the relay switch SCR2 via the resistor R2 and the resistor R1 in series. It is connected to a normally closed contact (shown by a black circle) and a normally open contact (shown by a white circle) of the relay switch SCR3. The other drive terminal of the DC motor 11 is connected to a common contact of the relay switch SCR2. The normally open contact (shown by a white circle) of the relay switch SCR2 and the common contact of the changeover switch 12 are connected to a +12 V power supply terminal via a fuse F, and the normally open contact of the relay switch SCR1 is connected to each of the relay coils CR1, CR2 and CR3. The other end is connected to the ground terminal L.
[0016]
The electric circuit of FIG. 1 is mounted as shown in FIG. 2. On the substrate 21, the above-mentioned resistors R1 and R2 are arranged side by side, and the relay switches SCR1, SCR2 and SCR3 are arranged. The DC motor 11 has, for example, a configuration shown in a partially cutaway sectional view of FIG. 3 and is basically the same configuration as a conventional DC motor, but is a large-scale speed control system for the future. The point that a semiconductor integrated circuit (LSI) 25 is provided is different from the conventional one.
[0017]
FIG. 4 shows a load characteristic diagram of the DC motor 11 at DC 12V. In the figure, I is the output, II is the rotation speed, III is the current, IV is the efficiency, V is the rating when the care lifter is raised, and VI is the rating when the care lifter is lowered. In the present embodiment, the rating of the DC motor 11 is constant during forward rotation when the care lifter is raised, while the torque is reduced from 5 kgf-m during reverse rotation when the care lifter is lowered. The feature is that it operates as a generator.
[0018]
5 and 6 are an external view as viewed from the rear side and an external view as viewed obliquely from the front when the upper end position of the embodiment of the care lifter according to the present invention is stationary, and FIG. 7 is a care lifter according to the present invention. FIG. 3 is an external view of the embodiment of the present invention as viewed obliquely from the front when the lower end position is stationary. In each of the drawings, a care lifter 30 includes a support portion 31 fixed to a predetermined position at the rear of a wheelchair lift vehicle 35, a movable portion 32 configured to be freely movable along the support portion 31, and a lower end of the movable portion 32. And a wheelchair mounting portion 33 having one end fixed thereto and moving up and down integrally with the moving portion 32. The electric circuit of FIG. 1 described above is provided in the support portion 31 together with the above-described vertical mechanism. I have.
[0019]
The wheelchair mounting unit 33 has a function of mounting a wheelchair 34 on which a physically handicapped person (not shown) is mounted and fixing the wheelchair 34 at a predetermined position. Further, the above-mentioned vertical mechanism for vertically moving the moving part 32 and the wheelchair mounting part 33 integrally moves the rotation of the motor shaft of the DC motor 11 (this is also simply referred to as the rotation of the DC motor in this specification) in a straight line. It is a rotation-to-linear conversion mechanism that converts the movement into motion and transmits it to the moving unit 32, and also a linear-rotation conversion mechanism that transmits the linear motion of the moving unit 32 to the motor shaft of the DC motor 11 when the moving unit 32 is lowered.
[0020]
Further, as shown in FIG. 5, the hatchback 36 of the wheelchair lift vehicle 35 is opened, and the wheelchair 34 on which the physically handicapped (not shown) is mounted is mounted in the rear interior 37 of the wheelchair lift vehicle 35 shown in FIG. The care lifter 30 in the state can be housed by manually rotating it half a turn with the support 31 as a support shaft, or can be pulled out as shown in FIGS. I have.
[0021]
In FIG. 5, the manual switch 38 provided at a predetermined position on the support 31 corresponds to the manual changeover switches 12 and 13 described above. When operated, the moving unit 32 is lowered, and when released, automatically returns to the center neutral position.
[0022]
Next, the operation of the present embodiment will be described with reference to FIG. 1 and FIGS. First, when the change-over switches 12 and 13 are in the neutral position, the relay coils CR1, CR2 and CR3 and the motor brake circuit 16 are de-energized, so that the relay switches SCR1, SCR2 and SCR3 are normally set as shown in FIG. The DC motor 11 is connected to the closed contact, and the DC motor 11 is braked. Thereby, the moving part 32 of the care lifter 30 maintains the stopped state.
[0023]
Next, when the moving unit 32 of the care lifter 30 is at the upper end position shown in FIG. 5 and FIG. 6, when lowering to the ground, the changeover switches 12 and 13 (the manual switch 38 in FIG. 5) are manually lowered. To operate. As a result, the changeover switches 12 and 13 are connected to the contacts 12b and 13b, respectively. The power supply terminal of + 12V, the fuse F, the changeover switch 12, the lower end detection limit switch 15, the motor brake circuit 16 and the ground terminal L are closed. , The motor brake circuit 16 is energized and the brake on the DC motor 11 is released.
[0024]
As a result, the moving unit 32 on which the wheelchair 34 with the physically handicapped is fixedly mounted starts to descend by its own weight, and the descending linear motion of the moving unit 32 is applied to the motor shaft of the DC motor 11 by the vertical mechanism. The DC motor 11 is transmitted and forcedly rotates, and the DC motor 11 rotates in the reverse direction to operate as a generator. At this time, since the relay coils CR1, CR2 and CR3 are not energized, a closed circuit of the DC motor 11-relay switch SCR3-resistor R2-resistance R1-relay switch SCR2-DC motor 11 is configured, so that the generator The current generated by the DC motor 11 that operates as described above is thermally discharged by the resistors R1 and R2, and as a result, the moving speed of the moving unit 32 is reduced.
[0025]
When the moving unit 32 is lowered to a predetermined height position near the ground as shown in FIG. 7, the lower end detection limit switch 15 of FIG. 1 is turned off, and the closed circuit including the lower end detection limit switch 15 is opened. The motor brake circuit 16 is de-energized, the DC motor 11 is braked, and the lowering of the moving unit 32 stops. In addition, even if the changeover switches 12 and 13 are set to the neutral position while the moving unit 32 is moving down, the moving unit 32 stops moving down.
[0026]
Next, an operation when the moving unit 32 of the care lifter 30 at the lower end position shown in FIG. 7 is raised will be described. At this time, the changeover switches 12 and 13 (the manual switch 38 in FIG. 5) are manually operated to the ascending side. As a result, the changeover switches 12 and 13 are connected to the contacts 12a and 13a, respectively. The power supply terminal of + 12V, the fuse F, the changeover switch 12a, the upper end detection limit switch 14, the relay coils CR1, CR2, and the CR3 ground terminal L Is closed, the relay coils CR1, CR2, and CR3 are energized, and the relay switches SCR1, SCR2, and SCR3 are each switched to the normally open contact side and connected.
[0027]
At this time, a closed circuit of the power supply terminal of +12 V, the fuse F, the changeover switch 12a, the upper end detection limit switch 14, the changeover switch 13, the motor brake circuit 16 and the ground terminal L is also configured. When the power is supplied, the brake on the DC motor 11 is released. Further, by switching the relay switches SCR1, SCR2, and SCR3 to the normally open contact side, a power supply terminal of +12 V, a fuse F, a relay switch SCR2, a DC motor 11, a relay switch SCR3, a relay switch SCR1, and a ground terminal L are connected. A closed circuit is also configured.
[0028]
As a result, the DC motor 11 is driven to rotate in the forward direction, and the rotational motion is transmitted to the moving unit 32 by the vertical mechanism, and the moving unit 32 starts to move up. When the moving part 32 continues to ascend and reaches the upper end of the predetermined height position as shown in FIGS. 5 and 6, the upper end detecting limit switch 14 is turned off, and the power supply to the relay coils CR1, CR2 and CR3 is cut off. Therefore, the relay switches SCR1, SCR2, and SCR3 are each switched to the normally closed contact side, the closed circuit including the DC motor 11 is opened, and the rotation of the DC motor 11 is stopped.
[0029]
At the same time, the power supply to the motor brake circuit 16 is also cut off, so that the DC motor 11 is braked. As a result, the moving unit 32 stops at the upper end position shown in FIGS. In addition, even if the changeover switches 12 and 13 are set to the neutral position while the moving unit 32 is being raised, the above-mentioned lifting is stopped.
[0030]
As described above, according to the present embodiment, the DC motor 11 is driven as a motor only when the moving part 32 is raised, and the DC motor is operated as a generator when the moving part 32 is lowered, and the heat is discharged by the resistors R1 and R2. In order to reduce the descending speed, the relay coils CR1, CR2 and CR3, the relay switches SCR1, SCR2 and SCR3, the motor brake circuit 16, the changeover switches 12 and 13, the limit switches 14 and 15, the resistance By using R1 and R2 and a simple circuit using extremely inexpensive components by the DC motor 11, the care lifter 30 can be configured at low cost, and the user's economical burden can be reduced. Further, in this embodiment, maintenance is possible with a small amount of electrical knowledge by eliminating the incomprehensible electrical components as much as possible, so that they can be used for a long time.
[0031]
The DC motor 11 used in the present invention is a novel motor driven by a DC power supply of +12 V. The application is not limited to the care lifter described above, and may be used as an accelerator motor such as a wind power generator. In that case, by using a 12V battery or the like and generating wind power, it can be used as an acceleration motor for a long time.
[0032]
【The invention's effect】
As described above, according to the present invention, the DC motor is driven only when the moving part is raised, and the DC motor is operated as a generator when the moving part is lowered. Since it is configured by circuit components, the care lifter can be configured at low cost, the economic burden on the user can be reduced, and the spread of the care lifter can be promoted.
[0033]
Further, according to the present invention, the configuration is such that maintenance is possible if there is some electrical knowledge by eliminating as many incomprehensible electrical components as possible, so that it can be used for a long time.
[0034]
Also, according to the present invention, even if the manual switch is not stopped, when the moving unit is raised to the predetermined first height position, the upper end detection limit switch operates to automatically start the DC motor. When the moving part has descended to the predetermined second height position, the lower end detection limit switch operates to automatically apply a brake to the DC motor. Even if the user forgets to stop the operation, the moving part can be automatically stopped at the predetermined first height position or the predetermined second height position, realizing a safe and easy-to-operate care lifter. it can.
[0035]
Furthermore, according to the present invention, since the motor used is a DC motor, the noise generated is smaller than that of the hydraulic motor, the rate of failure is low, and the moving part can be reliably raised and lowered even in cold regions.
[Brief description of the drawings]
FIG. 1 is an electric circuit diagram of an embodiment of a main part of the present invention.
FIG. 2 is an explanatory view of a mounting state of a main part in FIG. 1;
FIG. 3 is a partial cross-sectional view of the DC motor in FIG. 1;
FIG. 4 is an electrical characteristic diagram of the DC motor in FIG.
FIG. 5 is an external view of the embodiment of the care lifter according to the present invention as viewed from the rear when the upper end position is in a stationary state.
FIG. 6 is an external view of the embodiment of the care lifter according to the embodiment of the present invention viewed from obliquely forward when the upper end position is stationary.
FIG. 7 is an external view of the embodiment of the care lifter of the present invention as viewed obliquely from the front when the lower end position is stationary.
[Explanation of symbols]
Reference Signs List 11 DC motor 12, 13 changeover switch 14 Upper end detection limit switch 15 Lower end detection limit switch 16 Motor brake circuit 30 Care lifter 31 Support part 32 Moving part 33 Wheelchair mounting part 34 Wheelchair 35 Wheelchair lift car 38 Manual switch CR1, CR2, CR3 Relay coil SCR1, SCR2, SCR3 Relay switch R1, R2 Resistance

Claims (2)

A pillar fixed to a predetermined position of a wheelchair lift car moving with a wheelchair mounted,
A moving unit that moves up and down within a predetermined range along the column with the wheelchair mounted,
A DC motor that operates as a motor when the moving unit is raised to move the moving unit up, and when the moving unit is lowered, operates as a generator.
A manual switch for instructing ascending or descending or stopping the moving unit,
When the stop is instructed by the switch, a brake that is de-energized and stops the rotation of the DC motor is applied, and when the switch is instructed to move up or down, a motor brake circuit that is energized and releases the brake,
When the switch is instructed to ascend, a drive signal for rotating the DC motor in the forward direction is supplied.When the switch is instructed to descend or stop, a closed circuit including the DC motor and a resistor is formed to the DC motor. And a switching circuit for stopping the supply of the drive signal, when the switch is instructed to descend, by rotating the DC motor in a direction opposite to the upward movement by the lowering of the moving unit due to its own weight of the moving unit. A care lifter which operates as a generator, and lowers a descending speed by thermally discharging a signal generated from the generator by the resistor. An upper end detection limit switch that detects that the moving unit has risen to a predetermined first height position, configures the closed circuit by the switching circuit at the time of the detection, and deenergizes the motor brake circuit; And a limit switch for detecting a lower end of the motor brake circuit, which detects that the moving section has been lowered to the second predetermined height position, and de-energizes the motor brake circuit upon the detection. The care lifter according to 1.

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