JPS5911372Y2 - suspension lifting device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a suspended body elevating device for holding a suspended body such as a stage lighting device at a desired height from a high place using cylinders that extend successively in multiple stages.

BACKGROUND ART Conventionally, as a suspension lifting device of this type, there has been one in which a multi-stage cylindrical body is successively extended to hold a suspension body, for example, a stage lighting device, at an arbitrary height.

However, this conventional method has the disadvantage that it is complicated and expensive in structure, and that it cannot guarantee that the steps will be extended one step at a time.

In order to solve the above-mentioned drawbacks, this invention arranges an intermediate cylinder and an inner cylinder on a fixed outer cylinder so that they can move relative to each other on concentric axes, and the inner cylinder has an elastic body at its end. The elastic body has an arm that is rotatable about its free end as a fulcrum, and the arm is provided with a pressure contact at the other end that presses against the inner wall of the intermediate cylinder. It has a pressure release mechanism that detects when the cylinder has descended a predetermined distance and eliminates the pressure force of the pressure contact, and also connects the inner cylinder to the lifting drive mechanism. It is an object of the present invention to provide a suspension lifting device using a multi-stage cylindrical body in which stages extend one after another.

This invention will be explained below based on embodiments shown in the drawings.

As shown in FIG. 1, the suspension lifting device based on this invention is composed of an outer cylinder 1, an intermediate cylinder 2, and an inner cylinder 3.

These three types of cylinders are arranged on a concentric axis while maintaining a sufficient gap between them to allow relative movement.

The outer cylinder 1 is fixed to a part 5 of a structure at a high place such as a ceiling.

Furthermore, this structure is equipped with an elevating and lowering drive mechanism consisting of a motor M for hoisting the inner cylinder 3, a pulley, a rope 4, and the like.

A spring 34, which is an elastic body, is attached to the upper end of the inner cylinder 3, which has a suspended body L such as a stage lighting device at the lower end.

The upper ends of the springs are fixed to fulcrums 33 of two arms 32 extending left and right.

A roller 31 serving as a pressure contact is rotatably supported at both ends of the arm 32.

As shown in FIG. 3, the fulcrum 33 is guided by a central vertical guide groove 372 of a plate 37 fixed to the inner cylinder 3 so as to be movable up and down by the force of a spring 34.

Similarly, the shaft 36 of the roller 31 is connected to the horizontal guide groove 3 of the plate 37.
71, even if the fulcrum 33 rises, the rollers 31 move in both lateral directions without moving upward, and press against the inner wall of the intermediate cylinder 2 while moving up and down.

Here, the length of the arm 32 supporting the roller 31 is such that when the spring 34 is fully extended, the roller 31 jumps out of the inner wall of the intermediate cylinder 2 and rides on the end of the intermediate cylinder 2 to engage with it. (Figure 1).

Here, the pressure contact is not limited to the roller 31, and any shape may be used as long as it engages with the end of the intermediate cylinder when the spring is expanded and reduces friction with the intermediate cylinder when the pressure force is released. It's not a thing.

A hanging plate 35 is provided at the upper end of the inner cylinder to which the rope 4 is connected.

The rope 4 is wound up by a motor M.

Further, there is a flange portion 28 at the lower end of the inner cylinder, which prevents the intermediate cylinder from falling alone.

The intermediate cylinder 2 has a guide groove 27 in the vertical direction on its upper outer wall,
It houses a lever 21 made from a thin plate (
Figure 4).

The lever 21 has a first pawl 22 at its lower end, and rotatably supports a presser 24 via a hinge 25 at its upper end.

The pressurizer 24 includes arms 23 that protrude from both sides of the upper end of the intermediate cylinder 2.
It is rotatably supported around a shaft 26 fixed to.

Here, the lever 21 is shaped and made of a material that should have elasticity so that when it moves upward, the hinge 25 escapes outward and is pushed upward.

A second pawl 11 is provided at the lower end of the inner wall of the outer cylinder 1, and when the intermediate cylinder 2 is lowered by a predetermined distance, the first pawl 2
2 and the second claw 11 are positioned so that they engage with each other.

The presser and the pair of claws of the lever constitute a press release mechanism.

The suspended body elevating device based on this invention is not limited to three cylinders, but can be constructed with more cylinders or of any length.

In that case, a plurality of inner cylinders with different diameters are arranged on a concentric axis, and each inner cylinder has the structure of the above-mentioned inner cylinder, and the other inner cylinders except the innermost one have the above-mentioned intermediate cylinder. It is also equipped with a pressure release mechanism that has the same function as that of the above, to interlock each inner cylinder.

That is, for a certain inner cylinder, the inner cylinder located just outside it also serves as an intermediate cylinder.

Then, the innermost inner cylinder is connected to the elevating drive mechanism.

Further, each cylinder is moved smoothly relative to each other while maintaining an appropriate gap on a concentric axis by guide rollers 19 and 29, which are guides provided at the lower end of the cylinder located on the outside. do.

Of course, this guide does not need to be a roller, and the guide can be replaced by a low-friction sliding guide by combining the cylinders in a loose fit and protecting the contact surfaces with a low-friction material.

Next, the operation in the above structure will be explained.

As shown in FIG. 1, the suspension body L is initially pulled up to its upper limit by the rope 4, and both the inner cylinder 3 and the intermediate cylinder 2 are housed in the outer cylinder 1.

At this time, the spring 34 is not receiving any force from the pressure element 24, so it is in an extended state, the fulcrum 33 is located at the top, and the pressure contact 31 jumps out of the inner wall of the intermediate cylinder and rides on the end of the intermediate cylinder. ing.

At this time, the fulcrum 33 is located slightly above the center position of the roller 31.

Next, in order to set the suspension body L at a predetermined position, the inner cylinder 3 supporting the suspension body L is lowered.

This is done by letting out the rope 4 by the motor M.

The roller 31 at the upper end of the inner cylinder 3 rests on the upper end of the intermediate cylinder 2, and the fulcrum 33 is located slightly above the center of the roller 31, so when the inner cylinder 3 descends, the roller 31 is pushed down. The intermediate cylinder 2 also descends together with the force.

Here, since there is a flange portion 28 at the lower end of the inner cylinder 3, only the intermediate cylinder 2 does not descend.

Of course, this is not limited to the flange; for example, if the pressurizer 24 at the top of the intermediate cylinder is allowed to freely rotate downwards and a stopper is provided above at a certain rotational position,
The pressurizing element 24 engages with the fulcrum 33, and the intermediate cylinder 2 can be lowered together with the inner cylinder 3.

If the desired descending distance is shorter than the length of the inner cylinder 3, the suspended body is suspended with the intermediate cylinder 2 and the inner cylinder 3 integrated when the motor is stopped.

Next, when it is desired to further lower the suspension body, the rope 4 is let out by the motor.

When the intermediate cylinder 2 integrated with the inner cylinder 3 descends until the upper part of the intermediate cylinder 2 reaches the lower part of the outer cylinder 1, the first pawl 22 provided on the outer wall of the intermediate cylinder 2 engages the outer cylinder. 1 (FIG. 2).

Then, the lever 21 is pushed upward, and the pressurizing element 24 is rotated downward around the shaft 26 to push down the fulcrum 33.

When the fulcrum 33 is pushed down, the roller 31 attached to the tip of the arm 32 is drawn inward along the horizontal guide groove, enters the intermediate cylinder from the end of the intermediate cylinder, and rolls on the inner wall of the intermediate cylinder 2. The inner cylinder 3 descends independently inside the intermediate cylinder 2.

Then, the motor is stopped at a predetermined position to set and maintain the position of the suspended body.

Moreover, when it is desired to move the suspension body upward or to return it to the initial position, the above-mentioned process may be performed in reverse.

As described above, this idea is that the intermediate cylinder and the inner cylinder will surely descend as one unit because the roller rides on the end of the intermediate cylinder, and when the intermediate cylinder that is integrated with the inner cylinder descends a certain distance, the pair will be separated. Since the roller is reliably released by the presser by the operation of the pawl, the inner cylinder descends smoothly and independently within the intermediate cylinder.

As described above, although the suspended body elevating device according to the present invention has an extremely simple structure, it is possible to reliably send out the cylinders of each stage one after another and smoothly move the tubes up and down.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, and Figure 1 shows the inner cylinder,
A cross-sectional view of the intermediate cylinder when it is housed in the outer shell, Fig. 2 is a cross-sectional view of the part showing the operating state of the pressure contact, Fig. 3 is an enlarged cross-sectional view of the pressure contact part, and Fig. 4 is the release of the pressure contact of the intermediate cylinder. It is a perspective view showing a mechanism. DESCRIPTION OF SYMBOLS 1... Outer cylinder, 11... Second claw, 19... Roller, 2... Intermediate cylinder, 21... Lever, 22... First claw, 23... Arm, 24...pressure element, 25...
Hinge, 26... Shaft, 27... Guide groove, 29...
Guide roller, 3... Inner cylinder, 31... Roller, 3
2... Arm, 33... Fulcrum, 34... Spring, 35...
・Hanging board, 36... Axis, 37... Board, 371...
・Horizontal guide groove, 372... Vertical guide groove, 4... Rope,
5... Part of structure, M... Motor, L... Suspension body.

Claims (1)

[Claims for Utility Model Registration] 1. An intermediate cylinder and an inner cylinder are arranged within a fixed outer cylinder so as to maintain a gap that allows relative movement on a concentric axis, and an elastic body is attached to the end of the inner cylinder. The elastic body has an arm that is rotatable about its free end as a fulcrum, and the arm has a pressure contact at the other end that presses against the inner wall of the intermediate cylinder. This girl descended a certain distance inside: :,! A suspension lifting device characterized by having a pressure for releasing the pressure contact force of the pressure contact, and having an inner cylinder connected to a lifting drive mechanism. 2 A plurality of inner cylinders with different diameters are arranged on a concentric axis, and a pressure release mechanism is provided between each of the inner cylinders except for the innermost one among the plurality of inner cylinders, and the innermost cylinder is A suspended body elevating device according to claim 1, which is connected to an elevating drive mechanism. 3. The pressure release mechanism has a lever on the upper part of the intermediate cylinder outer wall that is guided in the vertical direction along the intermediate cylinder outer wall, and has a first claw at the lower end of the lever, and has a lever that is guided vertically along the intermediate cylinder outer wall, and has a first pawl at the lower end of the lever, and has a lever that is guided vertically along the intermediate cylinder outer wall. A pressurizer is provided at the upper end of the lever to interlock and apply a pressure release force to the elastic body, and the pressurizer engages with the first pawl at a position where the intermediate cylinder has descended within the outer cylinder by a predetermined distance to release the lever. The suspended body elevating device according to claim 1 or 2, characterized in that the lower end of the inner wall of the outer cylinder has a second claw for pushing upward. 4. The suspended body elevating device according to claim 1, 2, or 3 of the utility model registration claim, in which a guide is arranged between each cylinder to maintain a gap. 5. The suspended body elevating device according to claim 4 of the utility model registration claim, in which the guide element is a roller.