JPH0439805A - Elevating device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an elevating device, and for example, to a device for elevating and lowering lighting equipment installed at a high position such as the ceiling of a gymnasium. .

(Prior art) Generally, lighting fixtures installed at high places are suspended and supported by wire ropes connected to the lighting fixtures, and during maintenance and inspections such as lamp replacement, the wire ropes that have been wound up are suspended. It is necessary to unwind the lighting equipment so that it can be lowered, and conventionally, as shown in FIG. 4, one end of the wire rope 1 is fixed and the other end is connected to the winding drum 3 of the winding device 2. The middle part of the wire rope 1 is connected to a plurality of pulleys 5 provided on the elevating body 4 to which the lighting equipment is attached.
A structure was adopted in which the lighting device was raised and lowered by winding or unwinding the wire rope 1 of the winding device 2.

In addition, as shown in FIG. 5, both ends of the wire rope 1 are connected to the winding drum 3 of the winding device 2, and the middle part of the wire rope 1 is suspended around a plurality of pulleys 5 provided on the lighting equipment. Also known is a structure in which a lighting device is raised and lowered by winding or unwinding the wire rope 1 of the winding device 2.

(Problems to be Solved by the Invention) In the lifting device having the structure shown in FIGS. 4 and 5 above,
Cutting the wire rope 1 immediately causes the object to be lifted to fall, and since the wire rope 1 is generally formed by twisting a plurality of wire strands, when a tensile load is applied, In the structure shown in the figure, a rotational force opposite to the twisting direction is generated in the wire rope 1, making the elevating body 4 easier to rotate, and the rotation of the elevating body 4 causes kings in the wire rope 1, causing fatigue in the wire rope 1. There was a problem in that there was a risk that the wire rope 1 would be cut due to the progress of the wire rope.

Therefore, a structure can be considered in which one end of each of a plurality of independent wire ropes 1 is connected to the elevating body 4, and the other end of each wire rope 1 is wound up by a winding device 2 to suspend the elevating body 4. However, in a structure in which each independent wire rope 1 is wound by the winding device 2, winding of each wire rope 1 by the winding device 2 is performed by the winding device 2.
Since the winding state of the wire changes each time it is wound and unwinded, it is difficult to equalize the winding amount, and the hanging length of each wire rope 1 becomes the same. As shown in FIG. 2, if the hanging lengths of the wire ropes 1 wound up by the winding device 2 are different, the lighting equipment attached to the elevating body 4 will be tilted, and the weight balance on each wire rope 1 will be disrupted. However, there is a problem that the wire rope 1 is subject to overload, and the wire rope 1 is easily fatigued and cannot withstand long-term use.

The present invention was made in view of the above-mentioned problems, and it is possible to raise and lower the object to be lifted and lowered without tilting it by winding and unwinding the hanging strips that are independently connected to the object to be lifted and lowered, and the load applied to the hanging ropes. An object of the present invention is to provide a lifting device that prevents material fatigue of the hanging strips due to imbalance of the lifting rods, can withstand long-term use, and can safely suspend and support objects to be lifted and lowered.

[Structure of the invention]

(Means for Solving the Problems) The lifting device of the present invention includes a winding device that winds up the other end of a plurality of hanging strips each having one end connected to an object to be lifted and lowered, A balance maintaining means that winds a part of the hanging rod with a spring force around at least some of the hanging rods, detects the unbalanced weight applied to the hanging rod, and corrects the imbalance in the hanging length of each hanging rod. It has been established.

(Function) In the lifting device of the present invention, the object to be lifted and lowered is raised and lowered by winding or unwinding the hanging strip of the winding device.

When the hanging length of the hanging strip by the winding device becomes unbalanced, if the hanging strip to which the balance maintaining means is connected has a shorter hanging length than other hanging strips, then When an overload is applied to the suspension line, the suspension line that has been wound up by the spring force of the balance-holding means is unwound against the spring force, and the suspension line becomes longer, and the suspension line to which the balance-holding means is connected is If the hanging length is longer than that of the hanging rod, the load applied to the hanging rod will be reduced, and the hanging rod will be wound up by the spring force of the balance maintaining means, and the hanging rod will be shortened and the object to be lifted or lowered will be It is held horizontally, no overload is applied to the hanging strip for a long period of time, there is little fatigue due to the material of the hanging strip, and the object to be lifted and lowered can be safely supported for a long period of time.

(Embodiment) The structure of an embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Reference numeral 10 denotes an elevating body on which objects to be lifted and lowered, such as lighting equipment, are removably attached.This elevating object 10 has a plurality of suspensions such as wire ropes and chains installed at appropriate locations in consideration of the position of the center of gravity of the object to be lifted and lowered. One end of each of the strips 11 is connected, and the other end of each of the plurality of hanging strips 11 is fixed to each winding drum 13 of a winding device 12 that winds up each of these hanging strips 11.

The winding drums 13 are coaxially arranged in parallel, and the winding device 12 equipped with the winding drums 13 is attached to a fixed part at a high place such as the ceiling of a structure. And each of these hangings! The middle part of the kidney frame 1 is guided by a guide pulley 14 provided at a fixed part.

Further, reference numeral 15 denotes a balance maintaining means for detecting the unbalanced weight applied to the hanging strips 11 and correcting the imbalance in hanging length of each hanging strip 11, which is provided at the connecting portion of the hanging strips 11 of the lifting body 10. It is being Each of the balance holding means 15 is attached to a support shaft 16 projecting from the side surface of the elevating body 10, and a support shaft 16 that is rotatably supported on the support shaft 16 and has a suspension rope winding part 17 on the outer peripheral surface.
It is composed of a pulley-shaped rotating body 18 having a shape formed therein, and a spiral spring 19 that biases the hanging strip 11, which is locked at both ends to the support shaft 16 and the rotating body 18, in a direction to wind it. The support shaft 16 has a thread groove formed on the outer periphery of a small-diameter portion 21 formed through the proximal step portion 20, and this small-diameter portion 21 is formed with a threaded groove.
1 is inserted through the insertion hole 22 in the side surface of the elevating body 10, and the side surface is clamped and fixed between the nut 23 and the stepped portion 20, which are screwed into the threaded groove. The tension is adjusted to maintain the load balance so that the elevating body 10 is held horizontally.

In addition, identification sections of different colors or identification marks are formed at predetermined locations on the portion of the hanging strip 11 that is wound around the balance maintaining means I5, and the hanging strips 11 pulled out from the equilibrium maintaining means 15 are marked with different colors or identification marks at predetermined locations. By determining the length, it is possible to judge whether the load on the object to be lifted or lowered is overload or within the standard.

In addition, when a wire rope is used for the hanging strip 11, the pair of wire ropes whose twist directions are different from each other cancels out the rotational properties of each wire rope, thereby preventing rotation of the object to be lifted and lowered.

Next, the operation of this embodiment will be explained.

The winding drum 13 of the winding device 12 is rotated in either forward or reverse direction by the drive of an electric motor, and by winding or unwinding the hanging strip It, the lifting body 10 to which the lifting object is attached is raised and lowered. When the hanging length of the hanging strip 11 by the winding device 12 becomes unbalanced, and when the hanging strip 11 to which the balance maintaining means 15 is connected has a shorter hanging length than the other hanging strips 11, In this case, an overload was applied to the hanging strip 11, and the hanging strip 11 was wound up by the spring force of the spring 19 of the balance maintaining means 15.
The rotating body I8, which is wound up with When a hanging strip 11 has a longer hanging length than other hanging strips 11, the load applied to that hanging strip 11 is small (the rotating body 18 is rotated by the spring force of the balance maintaining means 15, and the hanging strip 11 is rotated by the spring force). The hanging length of the hanging strip 11 is shortened, the object to be lifted and lowered is held horizontally, no overload is applied to the hanging strip 11 for a long period of time, and the material of the hanging strip 11 is Fatigue can be prevented.

Note that if the weight of the lifted or lowered object attached to the lifting object lO is not balanced, loosen the nut 23 and rotate the support shaft 16 to adjust the spring tension of the spring 19.
By clamping and fixing the nut 23 screwed into the thread groove of the support shaft 16 and the stepped part 20, the weight balance is maintained, the load balance is maintained, and the object to be lifted and lowered attached to the lifting object 10 is tightened. Make sure it is held horizontally.

Furthermore, when the object to be lifted and lowered is attached to the lifting object 10, the hanging rod 1
The identification section or identification mark formed in 1 is the balance maintaining means 1.
The length of the hanging rod 11 pulled out from the balance maintaining means 15 can be determined based on whether or not there is a part unwound from the rotating body 18 of No. .

Further, when a wire rope is used for the hanging strip 11, by twisting the wire ropes in a pair in different directions, the rotational properties of each wire rope can be canceled out, and rotation of the object to be lifted and lowered can be prevented.

In the above embodiment, a structure in which a plurality of hanging strips 11 are connected to the elevating body 1o via the balance maintaining means 15 has been described, but some of the hanging strips 11 can be directly elevated and lowered without using the equilibrium maintaining means 15. It can also be connected to the body 10.

Further, although the balance maintaining means 15 is interposed between the suspension strip 11 and the elevating body 10, it can also be provided in the middle of the suspension strip II.

Moreover, the object to be lifted and lowered can be moved to the hanging strip 11 without intervening the lifting object 10.
A balancer 15 can also be connected to the balancer 15.

Note that the object to be lifted and lowered is not limited to lighting equipment, but can be applied to lifting devices for various types of equipment.

〔Effect of the invention〕

According to the present invention, at least some of the plurality of hanging rods each having one end connected to the object to be lifted and lowered is wound with a spring force to create an imbalance on the hanging rod. Since the balance maintaining means detects the weight and corrects the imbalance in the hanging length of each hanging strip, when the hanging length of the hanging strip by the winding device becomes unbalanced, the balancing means If the hanging length of a connected hanging rod is shorter than other hanging rods, an overload will be applied to that hanging rod, and the hanging rod that has been wound up by the spring force of the balance maintaining means will resist the spring force. The rope is unwound and the hanging strip becomes longer.
Additionally, if the suspension length to which the balance maintaining means is connected is longer than the other suspension lengths, the load applied to that suspension line will be reduced, and the spring force of the balance maintaining means will cause the suspension line to be pushed by the spring force. The hanging rod is wound up, the hanging rod is shortened, the object being lifted and lowered is held horizontally, no overload is applied to the hanging rod over a long period of time, and the fatigue of the material of the hanging rod is small, ensuring long-term safety. It is capable of supporting the object to be lifted and lowered.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an elevating device showing an embodiment of the present invention, Fig. 2 is a perspective view of the above balance maintaining means, Fig. 3 is a longitudinal cross-sectional view of a part of the above, and Figs. 4 and 5 are FIG. 6 is a perspective view of a conventional lifting device. FIG. 6 is a perspective view of a lifting device that is the premise of the present invention. 11. Hanging strip, 12. Winding device, 15. Balance holding means, 19. Spring. Third Tsukishima Works

Claims (1)

[Claims] (1) A winding device is provided for winding up the other ends of a plurality of hanging strips each having one end connected to the object to be lifted and lowered, and the winding device is provided to wind up the other end side of a plurality of hanging strips, each of which is connected at one end to the object to be lifted and lowered; 1. An elevating device characterized by being provided with a balance maintaining means that corrects an imbalance in hanging length of each hanging strip by winding a part of the hanging strip with a spring force and detecting an unbalanced weight applied to the hanging strip.