JP3661298B2 - Electric lift for nursing care - Google Patents

Description

[0001]
BACKGROUND 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]
[Prior art]
4 and 5 are a perspective view and a side view of a main part of a conventional electric lift for nursing care, where 1 is a rail provided at a high place in a room, 2 is a main body provided on a rail 1 so as to be able to run, 3 Is a belt wound around the drum 4 in the main body 2, and 5 is a hanger connected to the lower end of the belt 3 through a connecting portion 5 a and supports a cared person. Reference numeral 6 denotes a brake, and 7 denotes an operation unit suspended from the main body 2. Reference numeral 8 denotes an upper limit position detection plate sewn on the side of the belt 3 connected to the hanger 5, and a lower limit position detection plate 25 is also sewn to the side of the belt 3 connected to the drum 4. Reference numeral 9 denotes a proximity sensor provided in the main body 2.
[0003]
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 cared person is lifted through 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 to the case where the lower limit position detection plate 25 approaches the proximity sensor 9 when the belt 3 is lowered.
[0004]
FIG. 6 shows an operation circuit diagram of another conventional electric lift for nursing care. Between the power lines 10 and 11, there are a hoisting switch 12, an upper limit switch 13 and a hoisting drive relay 14 provided in the operating section 7. A lowering switch 15, a lower limit switch 16 and a lowering drive relay 17 provided in the operation unit 7 are connected in series between the power lines 10 and 11.
[0005]
In the operation circuit, when the winding switch 12 is turned on, the winding drive relay 14 is excited, the motor is driven, and the belt 3 is wound up. When the upper limit position is reached, the upper limit switch 13 is mechanically operated, and the driving of the motor is stopped. When the lowering switch 15 is turned on, the lowering drive relay 17 is excited to drive the motor, and the belt 3 is lowered. When it reaches the lower limit position, the lower limit switch 16 is mechanically operated to stop driving the motor.
[0006]
[Problems to be solved by the invention]
However, in the conventional electric lift for nursing care shown in FIGS. 4 and 5, when the hanger 5 is intentionally lifted after the motor stops due to the upper limit position detection plate 8 approaching the proximity sensor 9 at the upper limit position. The upper limit position detection plate 8 passes through the proximity sensor 9 and is positioned further upward. When the hoisting 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 detection plate 8 is mistaken as the lower limit position detection plate 25, the proximity sensor 9 operates, and the motor stops. Therefore, the lowering operation was stopped at about 5 cm and became virtually impossible.
[0007]
Further, in the case shown in FIG. 6, the limit switches 13 and 16 are mechanically operated. However, it is difficult to adjust the dog that operates the limit switches 13 and 16, and the stopping accuracy of the upper and lower limit positions is difficult. When the cared person is lifted diagonally, the operation of the limit switches 13 and 16 is particularly poor.
[0008]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an electric lift for care that can improve the stopping accuracy at the upper and lower limit positions with a simple configuration.
[0009]
[Means for Solving the Problems]
The electric lift for care according to claim 1 is provided with a lower limit position detection plate on the connection portion side with the drum of the belt, an upper limit position detection plate on the connection portion side with the hanger of the belt, and a lower limit position on the main body portion. Providing a proximity sensor that operates when the detection plate or upper limit position detection plate comes close, providing a winding drive relay that is excited by turning on the winding switch to drive the motor in the winding direction, and turning on the lowering switch is energized provided lowering driving relay for driving in a direction lowering winding motor, the lowering for latching relay is excited by turning on the switch down winding and winding-up latching relay is excited by turning on the winding-up switch also provided, the power supply and proximity sensor through the switch by further excitation of the winding-up latching relay Are connected, and the winding-up limit relay to de-energize the winding-up drive relay during operation of the proximity sensor, is connected to the power supply and proximity sensor through the switch by the exciting of the latching relay lowered winding, winding during operation of the proximity sensor A lowering limit relay is provided in which the lowering drive relay is not excited.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1
Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a front view and a side view of main parts of an electric lift for nursing care according to Embodiment 1 of the present invention. Reference numeral 18 denotes a motor for driving the drum 4, and reference numeral 19 denotes a drum by reducing the speed of the motor 18. 4 is a speed reduction part to be transmitted to 4.
[0011]
In the above configuration, the length of the upper limit position detection plate 8 is different from the conventional one. 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 distance from the lower end of the upper limit position detecting plate 8 to the upper end of the connecting portion 5a according to this embodiment (play). Min) is L ₂ , and L ₁ > L ₂ . Accordingly, when the motor 18 is driven by the operation of the operation unit 7 to rotate the drum 4 and wind up the belt 3, the cared person is lifted through 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. Since further be L ₂ is smaller lifts the hanger 5 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, the main body 2 is not damaged or cannot be lowered.
[0012]
Embodiment 2
FIG. 3 shows a circuit diagram of an operation circuit of the electric lift for nursing care according to the second embodiment, 20 is connected in parallel with the winding drive relay 14, recognizes the time of winding, latches the winding latching relay, 21 is the winding The lowering latching relays 22, 23 connected in parallel with the lowering drive relay 17 to recognize and hold and store the lowering are connected in parallel via the changeover switch 24 between the power line 10 and the proximity sensor 9. It is a connected limit relay for winding and lowering, and has contacts 22a and 23a, respectively. The changeover switch 24 is changed over by excitation of the latching relays 20 and 21. Other configurations are the same as those of the first embodiment.
[0013]
In the above configuration, when the winding switch 12 is turned on, the winding drive relay 14 is excited, the motor 18 is driven, the drum 4 rotates, and the belt 3 is wound up. When 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 line 10 and the proximity sensor 9. When the hanger 5 is wound up to the upper limit position, the proximity sensor 9 operates by the proximity of the upper limit position detection plate 8, the winding limit relay 22 is excited, and the contact 22a is opened. For this reason, 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, the changeover switch 24 is switched to the r side, and the lowering limit relay 23 is connected to the power source side. When the hanger 5 is lowered to the lower limit position, the proximity sensor 9 is operated by the proximity of the lower limit position detection plate 25, the lower limit relay 23 is excited, and the contact 23a is opened. For this reason, the excitation of the lowering drive relay 17 is released, the motor 18 is stopped, and the lowering operation is stopped.
[0014]
In the second embodiment, the proximity sensor 9 senses the upper limit position and the lower limit position to stop the motor 18, and the stop position accuracy is good, and even when the cared person is lifted diagonally, it operates without any problem. And no dog adjustment is required. In addition, it is determined whether the operation is a winding operation or a lowering operation, and limit relays 22 and 23 for stopping the motor 18 together with the proximity sensor 9 are switched, and the winding and lowering can be stopped with a simple configuration. it can.
[0015]
【The invention's effect】
As described above, according to the first aspect of 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 determining whether the winding operation or the lowering operation is being performed. Thus, the stop accuracy at the upper and lower limit positions can be increased with a simple configuration.
[Brief description of the drawings]
FIG. 1 is a front view of an essential part of an electric lift for care according to Embodiment 1 of the present invention.
FIG. 2 is a side view of the 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 nursing care electric lift.
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.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 2 ... Main-body part 3 ... Belt 4 ... Drum 5 ... Hanger 5a ... Connection part 7 ... Operation part 8 ... Upper limit position detection board 9 ... Proximity sensor 10, 11 ... Power line 12 ... Winding switch 14 ... Winding drive relay 15 ... Lowering switch 17: Driving relay 18 for lowering 18 Motor 20, 21 ... Latching relay 22, 23 ... Limit relay 24 ... Changeover switch 25 ... Lower limit position detection plate

Claims (1)

In an electric lift for nursing care in which a drum for winding and lowering a belt and a motor for driving the drum are provided in a main body portion provided at a high place, and a hanger for supporting a care recipient is attached to the lower end of the belt. A lower limit position detection plate provided on the connection portion side with the drum, an upper limit position detection plate provided on the connection portion side with the belt hanger, and a lower limit position detection plate or an upper limit position detection plate provided on the main body portion. Proximity sensor that operates when approaching, winding drive relay that is excited when the winding switch is turned on to drive the motor in the winding direction, and motor that is excited when the winding switch is turned on to drive the motor in the winding direction and lowering drive relay, and the winding-up latching relay is excited by turning on the switch hoisting, the switch down wind o And lowering a latching relay is energized by being connected to the power supply and proximity sensor through the switch by the exciting winding for the latching relay, and limit relay hoisting to non-excited winding drive relay during operation of the proximity sensor And a lowering limit relay that is connected to a power source and a proximity sensor via a change-over switch by excitation of a lowering latching relay, and de-energizes the lowering drive relay when the proximity sensor is operated. Electric lift for nursing care.

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