JPH1080450A - Motor driven lift for nursing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the damage to a mainbody part and a malfunction and also to enhance stop precision at upper and lower limit positions by simple configuration. SOLUTION: A drum 4 for winding-up and winding-down a belt 3 and a motor 18 for driving the drum 4 are provided inside the mainbody part 2 arranged at a high place, a hanger 5 for supporting a nursed person is attached to the lower end of the belt 3 and a lower limit position detecting plate and an upper limit position detecting plate 8 are respectively provided at the upper end and the lower end of the belt 3. Besides, a proximity sensor which is operated by the proximity of the respective detecting plates 8 is provided in the main body part 2 and also an interval between the lower end of the upper limit position detecting plate 8 and the hanger 5 is lessened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lift for nursing care, and more particularly to detection of upper and lower limit positions thereof.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show a perspective view and a side view of a main part of a conventional electric lift for nursing care, wherein 1 is a rail provided at a high place in a room, and 2 is provided on a rail 1 so as to be able to travel. A main unit 3, a belt wound around a drum 4 in the main unit 2,
Reference numeral 5 denotes a hanger connected to the lower end of the belt 3 via the connecting portion 5a, and supports the care receiver. 6 is a brake, 7
Denotes an operation unit suspended from the main body 2. Reference numeral 8 denotes an upper limit position detecting plate sewn on the side of the belt 3 connected to the hanger 5, and a lower limit position detecting plate 25 is sewn on the side of the belt 3 connected to the drum 4. 9 is the main body 2
It is a proximity sensor provided inside.

In the above configuration, when a motor (not shown) is driven by the operation unit 7 to rotate the drum 4 and wind up the belt 3, the care receiver is lifted via the hanger 5. When the upper limit position detection plate 8 approaches the proximity sensor 9, the proximity sensor 9 operates and the motor stops. The same applies when the lower limit position detection plate 25 approaches the proximity sensor 9 when the belt 3 is lowered.

FIG. 6 shows an operation circuit diagram of another conventional electric lift for nursing care. A winding switch 12, an upper limit switch 13 and a winding drive provided between the power supply lines 10 and 11 are provided on an operation section 7. A relay 14 is connected in series, and a lowering switch 15, a lower limit relay 16, and a lowering drive relay 17 provided on the operation unit 7 are connected in series between the power supply lines 10 and 11.

In the operation circuit, when the winding switch 12 is turned on, the winding driving relay 14 is excited, the motor is driven, and the belt 3 is wound.
When the upper limit position is reached, the upper limit switch 13 operates mechanically, and the driving of the motor is stopped. When the lowering switch 15 is turned on, the lowering drive relay 17 is turned on.
Is excited, the motor is driven, and the belt 3 is wound down. When it reaches the lower limit position, the lower limit switch 16
Mechanically operates and the driving of the motor is stopped.

[0006]

However, in the conventional electric lift for care shown in FIGS. 4 and 5, after the motor stops due to the upper limit position detecting plate 8 approaching the proximity sensor 9 at the upper limit position. When the hanger 5 is lifted intentionally, the upper limit position detecting plate 8 passes through the proximity sensor 9 and is located further above. If the winding operation is performed again in this state, the hanger 5 further rises and collides with the main body 2, possibly damaging the main body 2.
When the lowering operation is performed thereafter, the upper limit position detecting plate 8
Is erroneously recognized as the lower limit position detection plate 25, the proximity sensor 9 operates, and the motor stops. Therefore, the lowering operation is 5 cm
And stopped, making it virtually impossible.

Further, in the case shown in FIG. 6, the limit switches 13 and 16 are operated mechanically. However, it is difficult to adjust the dog for operating the limit switches 13 and 16, and the upper and lower limit positions are set. The stopping accuracy was poor, and the operation of the limit switches 13 and 16 was particularly poor when the care receiver was lifted diagonally.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can prevent damage and malfunction of the main body, and can improve stopping accuracy at upper and lower limit positions with a simple configuration. The purpose is to obtain an electric lift for use.

[0009]

According to a first aspect of the present invention, an electric lift for nursing care is provided with a lower limit position detecting plate on the side of the belt connected to the drum and an upper limit on the side of the belt connected to the hanger. A position detection plate is provided, and a proximity sensor that operates when the lower limit position detection plate or the upper limit position detection plate approaches to stop the motor is provided in the main body, and the hanger is lifted after stopping the motor at the upper limit position In this case, the distance between the lower end of the upper limit position detection plate and the hanger is reduced so that the motor stops continuously.

According to a second aspect of the present invention, there is provided an electric lift for nursing care, wherein a lower limit position detecting plate is provided on the side of the belt connected to the drum, and an upper limit position detecting plate is provided on the side of the belt connected to the hanger. Is provided with a proximity sensor that operates when the lower limit position detection plate or the upper limit position detection plate approaches, a winding drive relay that is excited by turning on the winding switch and drives the motor in the winding direction,
A lowering drive relay, which is excited when the lowering switch is turned on and drives the motor in the lowering direction, is provided. The lowering switch also operates when the lowering switch is turned on, and the lowering relay is operated when the lowering switch is turned on. A latching relay for lowering is provided, and the operation of the lowering latching relay and the operation of the lowering latching relay, which are connected to the power supply and the proximity sensor by the operation of the winding-up latching relay and de-energize the hoisting drive relay when the proximity sensor operates, are provided. And a limit switch for unwinding, which is connected to the power supply and the proximity sensor and deenergizes the drive relay for unwinding when the proximity sensor operates.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2 show a front view and a side view of a main part of an electric lift for nursing care according to an embodiment of the present invention, wherein 18 is a motor for driving the drum 4, and 19 is a motor 18 at reduced speed. This is a deceleration unit that transmits the signal to the drum 4.

In the above configuration, what is different from the prior art is the length of the upper limit position detecting plate 8. That is, the distance (play) from the lower end of the conventional upper limit position detecting plate 8 to the upper end of the connecting portion 5a.
Is L ₁ , and the interval (play) from the lower end of the upper limit position detection plate 8 to the upper end of the connecting portion 5a is L ₂ , and L ₁ > L ₂ . Therefore, when the motor 18 is driven by operating the operation unit 7 to rotate the drum 4 and wind up the belt 3, the care receiver is lifted via the hanger 5. When the upper limit position detection plate 8 approaches the proximity sensor 9, the proximity sensor 9 operates and the motor 18 stops. here,
Further since even lifting the hanger 5 L ₂ is small is in the sensing range of the upper limit position detection plate 8 is still the proximity sensor 9, further hoisting operations are not performed. For this reason,
There is no damage to the main body 2 or the inability of the lowering operation.

Embodiment 2 FIG. 3 is a circuit diagram of an operation circuit of an electric lift for nursing care according to Embodiment 2, and reference numeral 20 is connected in parallel with a hoisting drive relay 14, and recognizes the time of hoisting, and stores and stores the hoisting time. Latching relay, 21 is lowering drive relay 1
7 is connected in parallel with the lowering latching relay 22. The lowering latching relays 22 and 23 recognize the time of the lowering and hold and store the lowering.
These are winding-up and winding-down limit relays connected in parallel via a changeover switch 24 between 0 and the proximity sensor 9, and have contact points 22a and 23a, respectively. or,
The changeover switch 24 is switched by exciting the latching relays 20 and 21. Other configurations are the same as those of the first embodiment.

In the above configuration, the hoisting switch 1
When 2 is turned on, the winding drive limit relay 14 is excited, the motor 18 is driven, the drum 4 rotates, and the belt 3 is wound. Also, the lowering switch 15
Is turned on, the lowering drive relay 17 is excited, the motor 18 is driven, the drum 4 rotates, and the belt 3 is lowered. On the other hand, when the winding switch 12 is turned on, the winding latching relay 20 is also excited, the changeover switch 24 is switched to the s side, and the winding limit relay 22 is connected between the power supply line 10 and the proximity sensor 9. When the hanger 5 is wound up to the upper limit position, the proximity sensor 9 operates due to the proximity of the upper limit position detection plate 8, the winding limit relay 22 is excited, and its contact point 22a is turned on.
Opens. Therefore, the excitation of the winding drive relay 14 is released, the motor 18 is stopped, and the winding operation is also stopped. When the lowering switch 15 is turned on, the lowering latching relay 21 is also excited, and the changeover switch 2 is turned on.
4 switches to the r side, and the lowering limit relay 23
Is connected to the power supply side. When the hanger 5 is lowered to the lower limit position, the proximity sensor 9 operates due to the proximity of the lower limit position detection plate 25, the lowering limit relay 23 is excited, and its contact 23a is opened. Therefore, the excitation of the lowering drive relay 17 is released, the motor 18 stops, and
The lowering operation is stopped.

In the second embodiment, the upper limit position and the lower limit position are detected by the proximity sensor 9 and the motor 18 is stopped, so that the stop position accuracy is good and the care receiver can be lifted obliquely. It works without hindrance and does not require dog adjustment. Moreover, it is determined whether the operation is a hoisting operation or a lowering operation, and the limit relays 22 and 23 for stopping the motor 18 together with the proximity sensor 9 are switched, so that the hoisting and lowering can be stopped with a simple configuration. it can.

[0016]

As described above, according to the first aspect of the present invention, the distance between the lower end of the upper limit position detecting plate and the hanger is reduced, so that the winding operation can be performed even if the hanger is lifted after the winding operation is completed. There is no restart, and there is no damage to the main unit or the inability to lower the unit.

According to the present invention, the upper limit position and the lower limit position are accurately detected by the proximity sensor, and the motor stop circuit is switched by judging whether the operation is a winding operation or a lowering operation. A simple configuration can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of an electric lift for nursing care according to Embodiment 1 of the present invention.

FIG. 2 is a side view of a main part of the electric lift for care according to the first embodiment.

FIG. 3 is a circuit diagram of an operation circuit of an electric lift for care according to a second embodiment.

FIG. 4 is a perspective view of a conventional electric lift for care.

FIG. 5 is a side view of a main part of a conventional electric lift for nursing care.

FIG. 6 is a circuit diagram of an operation circuit of another conventional electric lift for nursing care.

[Description of Signs] 2 ... Main body 3 ... Belt 4 ... Drum 5 ... Hanger 5a ... Connecting unit 7 ... Operation unit 8 ... Upper limit position detection plate 9 ... Proximity sensor 10, 11 ... Power line 12 ... Winding switch 14 ... Winding Drive relay 15 ... lowering switch 17 ... lowering drive relay 18 ... motor 20, 21 ... latching relay 22, 23 ... limit relay 24 ... changeover switch 25 ... lower limit position detection plate

Claims (2)

[Claims] An electric car for nursing care in which a drum for winding and unwinding a belt and a motor for driving the drum are provided in a main body provided at a high place, and a hanger for supporting a cared person is attached to a lower end of the belt. In the lift, a lower limit position detection plate provided on the connection portion side of the belt with the drum, an upper limit position detection plate provided on the connection portion side of the belt with the hanger, and a lower limit position detection plate provided on the main body portion Provision of a proximity sensor that operates when the upper limit position detection plate approaches and stops the motor, and stops the motor at the upper limit position and then stops the motor when the hanger is lifted so that the motor stop state continues when the hanger is lifted. An electric lift for nursing care, wherein a distance between a lower end and a hanger is reduced. 2. A nursing electric motor having a drum for winding and unwinding a belt and a motor for driving the drum in a main body provided at a high place, and a hanger for supporting a care receiver at a lower end of the belt. In the lift, a lower limit position detection plate provided on the connection portion side of the belt with the drum, an upper limit position detection plate provided on the connection portion side of the belt with the hanger, and a lower limit position detection plate provided on the main body portion A proximity sensor that operates when the upper limit position detection plate approaches,
A winding drive relay that is excited when the winding switch is turned on to drive the motor in the winding direction, a winding drive relay that is excited when the winding switch is turned on to drive the motor in the winding direction, and a winding switch Latching relay that operates when the switch is turned on, Latching relay that lowers that operates when the switch for lowering is turned on, and the power supply and proximity sensor that are connected by the operation of the latching relay for winding, and the drive for winding when the proximity sensor operates. Equipped with a hoisting limit relay that deenergizes the relay and a lowering limit relay that is connected to the power supply and proximity sensor by the operation of the lowering latching relay and that deactivates the lowering drive relay when the proximity sensor operates. An electric lift for nursing care.