JPH0215217Y2 - - Google Patents

Description

[Detailed explanation of the invention] [Industrial application field] This invention allows relatively large lighting fixtures, such as fluorescent lamps and chandeliers, which are fixedly installed in the ceiling of a building by being embedded in the ceiling, to be freely raised and lowered. The present invention relates to a wire slip-out prevention mechanism that can reliably prevent a wire for suspending a lighting device from detaching from a winding groove of a reel in an electric lifting device.

[Conventional technology and its problems]

Conventionally, once this type of lighting equipment is fixed to the ceiling, etc., each time a light bulb or other parts are replaced or cleaned, a foothold such as a stepladder is required, or in some cases, the entire lighting equipment needs to be used. This required a great deal of time and effort, such as having to remove it from the ceiling.

In contrast, by connecting a lighting fixture to the end of a wire wound around a reel so that it can be suspended, and then rotating the reel forward and backward with a motor,
It may be possible to make the lighting fixtures freely go up and down, but this would prevent the wires from becoming excessive if, for example, the lighting equipment hits an obstacle such as a desk while descending and is prevented from descending. As the wire is unwound and loosened, a so-called buckling phenomenon occurs in the reel portion, and it is expected that a great deal of effort will be required to repair the wire.

Therefore, the applicant has proposed that by supporting the reel on the drive shaft of the motor via a roller clutch, if the above-mentioned inconvenience occurs, especially when the lighting equipment is lowered, the drive shaft can be immediately connected to the drive shaft using the roller clutch. We have developed a lifting device for lighting equipment, etc. that prevents crashes by stopping the feeding of the wire when the wire spins idly, and has already filed an application for registration of a utility model (Utility Model Application in 1983).
(No. 121957), if this device prevents the wire from descending midway, the wire left unwound on the reel will expand around the reel due to its own elasticity and try to come apart. Due to the combination of this force and the fact that the reel is free in the winding direction due to the roller clutch, the wire tends to become loose and often comes off from the winding groove of the reel, which remains a problem. It was hot.

[Means for solving problems]

Therefore, in the present invention, a wire presser that can be elastically inserted into the winding groove of the reel is stretched in the case of an electric lifting device using a roller clutch via a spring interposed at at least one end of the wire presser. This ensures that the wire in the winding groove does not loosen under any circumstances.

[Effect]

The present invention is configured as described, so that the wire presser always elastically presses the surface of the wire wound on the reel in the direction of its center, thereby ensuring that the wire leaves the reel's winding groove. It has a special effect of preventing this.

〔Example〕

Below, we will describe in more detail an example in which the configuration is applied to, for example, a lifting device as shown in the drawing. A drive shaft supported on one side and rotatable in forward and reverse directions by a motor M, or a reel 3 rotatably supported on one end of the drive shaft 2 via a one-way roller clutch 4, for example. Two series of winding grooves 3',
While winding the wires 5 and 5 around 3',
Each wire 5 is guided out of the case through a seat hole 8 penetrated through the bottom plate at the other end of the case via a guide ring 6 and a guide roller 7, and a lighting device that can be seated in the seat hole 8 at the end thereof. It is formed by connecting two mounting frames 9.

Furthermore, 10 is a wire holder made of a flexible wire material having a diameter corresponding to the groove width of the winding grooves 3', 3', and has both ends fixed to the inner wall of the case, and at least one end thereof. A spring 11 is interposed between the wires so that the intermediate portion thereof can always press the wire in each winding groove 3', 3' of the reel with a constant elasticity that does not affect winding and unwinding. This is what I did.

The material of the wire is not particularly limited as long as it has appropriate flexibility, such as hard plastic or metal wire.

In addition, 12 in the figure is fitted to the periphery of the seat hole 8,
A seat ring 13,1 that allows the electrode 12' and the electrode 9' on the mounting frame side to be brought into contact with and separated from each other as the mounting frame 9 moves up and down;
Reference numeral 4 indicates a worm gear on the motor shaft and a worm wheel that meshes with the worm gear, and 15 indicates a reduction gear.

Next, when using the above-mentioned lifting device, by rotating the motor M in forward and reverse directions, the wire 5 is paid out or wound up according to the amount of rotation of the motor, and the lighting equipment is raised and lowered; In addition, if the lighting equipment collides with a desk or other obstacle during its descent and is prevented from descending, the action of the roller clutch 4 immediately removes the reel 3.
As mentioned above, even in the latter case, the wire presser 10 holds the wires 5, 5 wound on the reel 3 against their expanding elasticity, Because it is always pressed with a constant pressure, regardless of the amount of winding, even when the amount of wire to be wound is large (solid line in Figure 1) or small (dotted chain line in the same figure), This makes it possible to completely prevent inconveniences such as the respective wires 5, 5 becoming loose and coming off from the winding grooves 3', 3' of the reel.

It should be noted that the above embodiment is just an example of the application of the proposed mechanism, and the present invention is not limited to use for lifting and lowering lighting equipment as mentioned at the beginning.
It goes without saying that the present invention can be widely applied to various structures in which wire rods or wires are wound on reels and can be moved up and down, such as hanging shelves installed at high places.

[Effect of idea]

As described above, according to the groove prevention mechanism of the present invention, there is no possibility that the wire will separate from the winding groove of the reel under any circumstances, and furthermore, it will not cause any hindrance to the winding and unwinding operations of the wire. In addition to ensuring stable lifting and lowering of the lighting equipment at all times, the above-mentioned wire holder does not require any special space to install and its structure is extremely simple, which improves the performance of this type of electric lifting device. It has significant practical advantages in improving

[Brief explanation of drawings]

FIG. 1 is a plan view showing a lighting equipment elevating device equipped with the proposed mechanism with the top surface of the case removed, and FIG. 2 is a vertical cross-sectional view of the main parts thereof. In the figure, 1... case, 2... drive shaft, 3...
Reel, 4...Roller clutch, 5...Wire, 10...Wire presser, 11...Spring.

Claims (1)

[Scope of utility model registration request] The reel is rotated by a roller clutch so that the wire is wound in an overlapping manner between the winding grooves of the reel, and a wire presser that is recessed into the winding groove of the reel is provided between at least one end of the wire and the case. A wire groove prevention mechanism in a lifting device such as a lighting equipment, characterized in that the wire is elastically stretched by a spring.