JPH048567Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a lifting device in which a lifting body is raised and lowered by a main wire and is prevented from falling by an auxiliary wire. This relates to technology that easily detects cuts and increases safety.

[Prior Art] Conventionally, as shown in FIG. 9, an electric lifting device suspends and supports a lifting body 1 by a series of two main wires 2, 2 via pulleys 4, 4. hand,
Although this prevents the elevating body 1 from tilting, as shown in FIG. 10, there is a problem in that the main wires 2, 2 are twisted and rubbed during the ascent and descent, and there is a risk of wire breakage. In addition, as shown in FIG. 11, when storing the elevating body 1, the elevating body 1 can be connected to the fixed case 11 via the hook F to prevent it from falling, but the elevating body 1 is lowered and used. Sometimes there is only the main wire 2, and if the main wire 2 breaks, it will fall. As shown in FIG. 12, the elevating body 1 is suspended by the chain 5, and the power supply cord 6 connected to the elevating body 1 also falls when the chain 5 breaks. So 2
In a structure in which the elevating object 1 is suspended in a well-balanced manner by the main wires 2, 2, it is also possible to connect an auxiliary wire to the center of gravity of the elevating object 1 to prevent it from falling.

[Problem to be solved by the invention] However, when the auxiliary wire is connected to the center of gravity of the elevating object in this way, even if the main wire is cut, the elevating object is suspended in a well-balanced manner by the auxiliary wire. There is a problem in that it is not clear when the main wire is cut, and the load of the elevating body is applied directly to the auxiliary wire, causing a problem in the strength of the auxiliary wire.

[Means for solving the problem] The lifting device of the present invention connects the lifting body 1 to the main wire 2.
This is an elevating device in which an auxiliary wire 3 for preventing falling is connected to an elevating object 1, and the auxiliary wire 3 is connected away from the center of gravity G of the elevating object 1, and the drive system of the auxiliary wire 3 is connected. The system is separate from the drive system of the main wire 2, and means is provided to avoid the load of the lifting body 1 being applied to the auxiliary wire 3 when the auxiliary wire 3 is fed out and wound up by the drive system on the auxiliary wire 3 side. This is a characteristic feature.

[Function] In this way, by connecting the auxiliary wire 3 away from the center of gravity G of the elevating body 1, if the main wire 2 is unexpectedly cut, the elevating body 1 can be fixed by the auxiliary wire 3. The lifting body 1 is suspended at a position where the center of gravity G is removed, and the elevating body 1 is tilted, thereby making it possible to visually judge whether the main wire has been cut. By providing a system separate from the drive system of the main wire 2 and providing a means to avoid the load of the lifting body 1 from being applied to the auxiliary wire 3 when the auxiliary wire 3 is fed out and hoisted up by the drive system on the auxiliary wire 3 side, the main wire 2 is In order to raise and lower the elevating body 1, the drive on the auxiliary wire 3 side is performed by a separate system, so that the load of the elevating body 1 is not applied to the auxiliary wire 3, and when the main wire 2 is cut. The elevating body 1 can be securely held by the auxiliary wire 3,
This ensures sufficient safety.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

Figure 1 shows the whole, and the interior of the case 11, which is attached to the ceiling, is divided into two levels, upper and lower.
A winding motor 9 is housed in the lower part of the winding motor 9 so as to be able to drive and rotate the wire drum 12. The main wire 2 hanging from the case 11 connects to a pair of pulleys 15, 1 provided inside the elevating body 1.
5, the upper end of which is fixed, and by driving the motor 9, the main wire 2 can be wound around the wire drum 12 and unwound to raise and lower the elevating body 1. be. The motor 9 is a brake motor equipped with a brake, and when the power to the motor 9 is cut off, the brake is activated, the rotation of the motor 9 is stopped, and the elevating body 1 is of a free-set type that maintains the desired elevating position. It is set as.

A motor 21 and a drum 22 for winding up the auxiliary wire 3 are housed in the upper part of the case 11, and the auxiliary wire 3 hanging down via a roller 23 is connected to the elevating body 1 and connected to the main wire 2. It has a double safety structure with the auxiliary wire 3. The motor 21 on the side of the auxiliary wire 3 is also equipped with a brake, and when the motor 21 is not driven to rotate, the brake is activated to prevent the drum 22 from rotating. Then, connect the auxiliary wire 3 to the center of gravity G of the lifting body 1.
By removing the auxiliary wire 3 from the center of gravity G of the elevating object 1 in this way, if the main wire 2 is accidentally cut, the elevating object 1 can be moved to its center of gravity using the auxiliary wire 3. When suspended at the position where G is removed, the elevating body position is tilted as shown in FIG. 3, thereby making it possible to visually judge whether the main wire 2 has been cut.

The winding speed on the main wire 2 side is set to twice the winding speed on the auxiliary wire 3 side. The winding and unwinding speeds of the auxiliary wire 3, which is one wire attached to the elevating body 1, are set to be approximately equal. Such tuning of the winding speed is performed by selecting the gear ratio when the drum diameters are the same. In other words, the gear ratio on the main wire 2 side should be twice the gear ratio on the auxiliary wire 3 side.

By the way, the length of the main wire 2 for two wires is required to be twice the length of the auxiliary wire 3 for one wire. diameter drum 12,2
2, the winding diameter of the winding drum 12 on the main wire 2 side grows rapidly, which may cause slack on the auxiliary wire 3 side, or conversely, when unwinding the auxiliary wire 3 side, an elevating body is placed on the auxiliary wire 3 side. 1 load may be applied directly. In such a case, the auxiliary wire 3 may be damaged or its durability may be reduced. Therefore, in the present invention, the auxiliary wire 3 may be loosened more than necessary, or the load of the elevating body 1 may be directly applied to the auxiliary wire 3. I made it so that it wouldn't hang. In other words, when the auxiliary wire 3 is fed out and rolled up by the drive system on the auxiliary wire 3 side, the elevating body 1 is attached to the auxiliary wire 3.
Means is provided to avoid this load.
The configuration will be explained in detail below.

As shown in FIG. 4, the roller 23 that changes the path of the auxiliary wire 3 is pulled by a spring 24, and the drum 22 is held by a holding case 23 that holds the drum 22.
It is arranged to be drawn to the right in FIG. 4 within the range of the elongated hole 26 of No. 5. A microswitch 27 is disposed near the drum 22 to control power supply to the motor 21.

According to such a configuration, when the elevating body 1 is lowered, the micro switch 27 is switched so that the switch configuration becomes a normally off circuit configuration, and the winding of the main wire 2 side is performed in the state shown in FIG. 7a. Along with the motor 9, the motor 21 on the auxiliary wire 3 side
is driven, and the main wire 2 and the auxiliary wire 3 are fed out. In such a case, the state shown in FIG. 7b is reached. When the elevating body 1 is descending, the auxiliary wire 3 is let out longer than the main wire 2 due to the difference in gear ratio, etc., and when the auxiliary wire 3 becomes slack, the roller 23 is moved as shown in FIG. 7c. It is pulled to the right by the spring 24, turns off the micro switch 27, stops the rotation of the motor 21, stops feeding out the auxiliary wire 3, and eliminates the slack of the auxiliary wire 3 in the descending elevating body 1. Next, the slack in the auxiliary wire 3 is eliminated, and the roller 23 is moved by the spring 24.
When pulled against this, the micro switch 27 is turned on, as shown in FIG. 7d, the motor 21 is rotated, and the auxiliary wire 3 is fed out.

Next, when raising the elevating body 1,
As shown, the switch configuration of the micro switch 27 is switched to be normally on, and even if the main wire 2 is wound up by the driving rotation of the winding motor 9, the motor 21 on the auxiliary wire 3 side is stopped.
In this winding state of the main wire 2 [in such a case, it is in the state shown in FIG. 8b], if slack occurs on the auxiliary wire 3 side, the drum 22 is moved by the spring 24 as shown in FIG. 8c. When pulled to the right, the micro switch 27 is turned off, the motor 21 is activated, and the auxiliary wire 3 is wound onto the drum 22 to take up the slack. When the slack is removed, the drum 22 is pulled to the left by the auxiliary wire 3 as shown in FIG. 8d, and the micro switch 27 is turned on to stop the motor 21. Also, auxiliary wire 3
In the middle of winding, the auxiliary wire 3 is wound faster than the main wire 2 due to the difference in gear ratio, but
Main wire 2 is stretched, micro switch 27
is turned on, and the motor 21 is stopped. In this way, winding and unwinding are performed.

In addition, the upper part of the case 11 includes a power supply drum 2.
The power supply drum 28 has a built-in spring such as a spiral spring, and a cord 6 that is supplied with power via a power supply unit such as a slip ring is led out from the power supply drum 28. The cord 6 is wound around the drum surface of the power supply drum 28 with a spring and biased. The cord 6 is then suspended via a guide roll, connected to the elevating body 1, and
It is arranged so that electric power can be supplied to the elevating body 1.

[Effects of the invention] In summary, the present invention is an elevating device in which an elevating object is suspended by a main wire and an auxiliary wire is connected to the elevating object to prevent falling, and the auxiliary wire is separated from the center of gravity of the elevating object. If the main wire is accidentally cut, the lifting body will be suspended by the auxiliary wire at a position off its center of gravity, causing the lifting body to tilt. , it has the advantage of being able to visually determine whether the main wire has been cut. Moreover, since the auxiliary wire is located away from the center of gravity of the lifting body, it can suppress twisting of the lifting body and prevent the main wire from breaking.
Moreover, the drive system for the auxiliary wire is made separate from the drive system for the main wire, and a means is provided to avoid the load of the lifting body from being applied to the auxiliary wire when the auxiliary wire is fed out and wound up by the drive system on the auxiliary wire side. Therefore, even though the main wire is used to raise and lower the elevating object, the auxiliary wire side is driven by a separate system, so that the load of the elevating object is not applied to the auxiliary wire, and if the main wire is cut. This has the advantage of being able to securely hold the elevating body using the auxiliary wire, ensuring sufficient safety.

In other words, in the present invention, when the main wire is accidentally cut, the lifting object is reliably suspended by the auxiliary wire, which avoids the load and does not have the risk of being cut unexpectedly. In the lowered state, the lifting body is hung diagonally,
It is unique in that it warns when the main wire is cut.

[Brief explanation of the drawing]

Figure 1 is an overall front view of one embodiment of the present invention;
The figure is a partial perspective view of the same as the above, FIG. 3 is a front view showing the effect of the same as the above, FIG. 4 is a partially enlarged front sectional view of the same as the above,
Figure 5 is a partial front view of the same as the above, Figure 6 is a side view of the same as the above, Figure 7 a, b, c, and d are explanatory diagrams of the operation during unwinding of the same as the above, Figure 8 a, b, c, d. 9 is a front view of the conventional example, FIG. 10 is a front view showing the problem of the same as the above, FIG. 11 is a front view of another conventional example of the same, and FIG. The figure is a side view of yet another conventional example, in which 1 is an elevating body, 2 is a main wire, and 3 is an auxiliary wire.

Claims (1)

[Scope of utility model registration request] This is a lifting device in which an elevating object is suspended by a main wire and an auxiliary wire is connected to the elevating object to prevent it from falling. An elevating device that is separate from the wire drive system and is provided with means for avoiding the load of the elevating body being applied to the auxiliary wire when the auxiliary wire is fed out and wound up by the auxiliary wire drive system.