JPS5910960Y2 - Electric lifting device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an electrical structure of an electric lifting device such as a lighting fixture.

FIG. 1 is a circuit diagram showing a conventional example of an electric lifting device.

In the figure, 1 is a power supply, 2 is a motor for lifting and lowering, 3 is a capacitor for its phase, and 4 is an operation switch with contacts a,
The contact pieces 5 and 6 are operated in conjunction with the contacts 1) and 1), the contact piece 5 which is switched to the contacts a and 1), and the contact piece 6 which opens and closes the contact point C.

7 is a lowering switch that opens when the ascent is completed and is closed by a solenoid 8, and 9 is a switch that opens when the lowering is completed. The downward rotation side of the motor 2 is connected through the switch 7, the switch 9, and the contact C, and the solenoid 8 is connected through the contact a.

In such a circuit, the contact piece 5 is activated by operating the operation switch 4.
When the switch is moved to contact a and contact b is closed by contact piece 6, solenoid 8 is activated and switch 7 is closed, motor 2 is connected to the downward rotation side and switch 9 is also closed, so motor 2 rotates downward. Initially, the lighting equipment and the like that are the load on the motor 2 are lowered.

Then, when the lighting equipment or the like reaches a predetermined position due to the lowering, this is detected and the switch 9 is opened, the circuit is opened, the motor 2 is stopped, and the lowering is completed.

Next, when the operation switch 4 is operated to move the contact piece 5 to the contact point b and the contact piece 6 is removed from the contact point C, the motor 2 is connected to the upward rotation side and is connected to the closed switch 7 and the contact point b. The motor 2 rotates upward and the lighting equipment etc. begin to rise.

When the lighting equipment etc. starts to rise, the switch 9 returns to the closed state due to its positional displacement, and prepares for the next lowering operation.

When the lighting equipment, etc. reaches a predetermined position, this is detected and the switch 7 is opened, the lifting is completed, and the lighting equipment, etc. is held at the raised position.

Furthermore, when you want to descend for maintenance of lighting equipment, etc.
As described above, by tilting the contact piece 5 toward the contact point a side and closing the contact point C by the contact piece 6, the solenoid 8 is actuated, the switch 7 is closed, and the motor 2 is rotated downward.
Perform the same operation.

FIG. 2 shows the wiring when operating a plurality of lifting loads using the operation switch 4 in common in such an electric lifting device. are commonly connected to one end of the power supply 1 and one end of each contact a, l), c of the operation switch 4.

In this circuit, the operation switch 4 is operated to the lower side, the contact piece 5 is brought down to the contact point a, and the contact piece 6 and the contact point C are
When closed, the motor 2 rotates downward in circuits A and B.

Then, in circuit A, when the lighting equipment etc. reaches the predetermined position during descent first and the switch 9 is opened, the capacitor 3 of circuit B
Current is supplied to the upward rotation side of motor 2 through It had the disadvantage of repeating declines and rises.

In this way, the electric lifting device shown in Fig. 1 operates normally when used alone, but if you try to operate multiple motor circuits in parallel using a common operation switch,
This is inconvenient because mutual interference occurs between the circuits, making it impossible to perform the intended operation.

The present invention has been devised in view of this point, and in the embodiment shown in FIG. 3, the operating switch 4 in the embodiment shown in FIGS. A relay 12 for preventing mutual interference is connected in parallel with the solenoid 8, its normal contact 11 is connected in series with the switch 9, and one end of the normally closed contact 10 of the relay 12 is connected to the rising end of the motor 2. The other ends of the contacts 10 and 11 are commonly wired and connected to the power source 1.

Then, it is wired to the next motor circuit B via both ends of the power supply 1 and one end of the contact a of the operation switch 4.

In the figure, K1 indicates a motor drive section, and K2 indicates a control section that controls each switch and contact of the motor drive section K1.

In such a device, when the operating piece 5 of the operating switch 4 is closed, the solenoid 8 is activated in circuits A and B, and the switch 7 is closed, and at the same time, the relay 12 is activated and its normally open contact 11 is closed and the state is closed. Motor 2 via switch 9 of
is connected to the downward rotation side, the motor 2 rotates downward, and the lighting equipment etc. descend.

When the lighting equipment, etc. is completely lowered, the circuit that was lowered first, for example switch 9 of circuit A, is opened and the motor 2
The downward rotation of stops.

At this time, the relay contact 10 on the upward rotation side of motor 2 is also open, so motor 2 of circuit A is completely separated from the circuit, and no matter what the downward rotation state of rotation B is, it will not be affected. The descent ends without being hit.

In the case of upward movement, when contact a is opened using contact piece 5 of operation switch 4, solenoid 8 and relay 12 are deactivated.
The relay contact 10 closes and the contact 11 opens, causing the motor 2 to rotate upward and the lighting equipment to rise. When the motor 2 reaches its full height, the switch 7 opens and the circuit is cut off, causing the motor 2 to stop rotating and the lighting equipment to move upward. The ascent ends.

In this state, of course, influences from other circuits are removed.

As mentioned above, the electric lifting device according to the present invention has a first switch 7 that opens upon detecting the end of the lifting (lowering) of the lifting load of the reversible motor, which is connected in series to the first switch 7 to raise (lower) the motor. Series circuit between the rotation side and the normally closed contact 10 of the rotation control relay 12 and lowering (raising) of the motor
A normally open contact 11 of the rotation control relay 12 and a second switch 9 that opens upon detecting the end of the descent (increase) of the rotation side and lifting load.
and the connection point of the normally closed contact 10 of the motor's rising (lowering) rotation side and the rotation control relay and the motor's descending (raising) rotation side and the second switch 9.
A plurality of motor drive units K1 are connected in parallel to both ends of the power supply 1, and a first switch closing solenoid 8 and a rotation control relay 12 are connected in parallel to both ends of the power supply 1. A remoter drive unit K is connected in parallel with
The present invention is characterized in that a plurality of control sections K2 for controlling the flow to the power source 1 are provided corresponding to the motor drive sections K1, and each control section K2 is connected in parallel to both ends of the power supply 1 via a common lift operation switch 4. Therefore, even if a plurality of motor circuits are wired using a common operation switch, only three wires are required, and the motor circuits can stably move up and down without mutual interference.

[Brief explanation of drawings]

Figures 1 and 2 are circuits showing a conventional electric light control device;
FIG. 3 is a circuit diagram showing an embodiment of the present invention.

Claims (1)

[Scope of utility model registration request] A first switch 7 that opens upon detecting the end of the rise (fall) of the lifting load of the reversible motor; a normally closed contact between the motor's rise (fall) rotation side and the rotation control relay 12 that is connected in series with the first switch 7; 10, and a parallel circuit of the second switch 9, which opens upon detecting the descending (ascending) rotation side of the motor and the end of the descending (ascending) of the lifting load, and the normally open contact 11 of the rotation control relay 12. The connection is connected between the connection point of the motor's upward (downward) rotation side and the normally closed contact 10 of the rotation control relay and the connection point of the motor's downward (rise) rotation side and the second switch 9. Phase capacitor 3
, a plurality of motor drive units K1 are connected in parallel to both ends of the power supply 1, and the first switch closing solenoid 8 and rotation control relay 12 are connected in parallel to allow current to flow to the motor drive unit K1. An electric lifting device characterized in that a plurality of control units K2 are provided corresponding to the motor drive unit K1, and each control unit K2 is connected in parallel to both ends of a power source 1 via a common lifting operation switch 4.