JPS6310583Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an elevating device for disposing electrical appliances such as lighting equipment so that they can be raised and lowered.

[Background technology]

Conventionally, as shown in FIG. 1, this type of lifting device includes a lifting section 2 to which an electric appliance 1 such as a lighting device is attached, and a winding means for winding a wire rope 3 that suspends the lifting section 2. 4, and a fixed part 5 having a fixed part 5, and a power supply for operating the electric appliance 1 was supplied from the fixed part 5 to the elevating part 2. By the way, in such a conventional example, when a ground fault occurs in the lifting section 2, that is, when the non-grounded side of the power supply contacts the housing of the lifting section 2, the ground fault current I
There is a problem in that the wire rope 3 flows through the housing wire rope 3 of the lifting section 2 and the housing of the fixed section 5 to the ground wire 6, and the wire rope 3 is fused and the lifting section 2 falls, which is dangerous.

[Purpose of invention]

The present invention was developed in view of the above points, and its purpose is to provide a safe lifting device in which the wire rope will not melt even if a ground fault occurs in the lifting section. It is about providing.

[Disclosure of invention]

(Embodiment) FIGS. 2 to 4 show an embodiment of the present invention, and the schematic structure is the same as that of the conventional example shown in FIG. In the figure, 7a to 7d are power terminals provided on the upper surface of the lifting part 2, 8a to 8d are power contacts provided on the lower surface of the fixed part 5, and the power terminals 7a to 7d are connected to the power contact 8.
By making contact with a to 8d, power supply AC for operating electric appliances is supplied from the fixed part 5 to the elevating part 2. In addition, in the example, four pairs are provided, but two of them are used to connect the power source.
AC is supplied. 9 is a ground contact provided on the lower surface of the fixed part 5 and connected to the ground wire 6;
When the power terminals 7a to 7d contact the power contacts 8a to 8d, the ground contact 9 comes into elastic contact with the housing 10 of the elevating section 2, which is made of zinc die casting. 18 and 19 are elastic coil springs;
The contact pressure of contacts 8a, 8b, and 9 is approximately 500 g. 12 is a wire fixing means for fixing one end of the wire rope 3 to the housing 11 of the fixed part 5; 13;
A and 13b are connected to the wire rope 3 and are connected to the lifting section 2.
A pulley 14 is pivotally supported by the housing 10 and is a pulley for introducing the other end of the wire rope 3 into the winding means 4, and the winding means 4 winds up the other end of the wire rope 3 with one end fixed. By this, the elevating part 2 is raised, and by unwinding, the elevating part 2 is lowered. However, the wire fixing means 12,
The pulleys 13a, 13b, 14 are made of metal, and the housings 10, 11 are electrically connected via the wire rope 3. 15 is a power supply terminal to which a power line from a power source AC is connected, and 16 is a connection terminal to which a power line of an electric appliance 1 such as a lighting fixture is connected.

Now, when the wire rope 3 is wound up and the elevating part 2 rises to the position where it fits into the recess 17 of the housing 11 of the fixed part 5, the power terminals 7a of the elevating part 2,
Immediately before or at the same time as 7b comes into elastic contact with the power contacts 8a and 8b of the fixed part 5, the ground contact 9 comes into elastic contact with the housing 10 of the lifting part 2, and the housing 1
0 will be grounded via ground contact 9 and ground wire 6. Therefore, when the non-grounded side of the power supply AC comes into contact with the housing 10 of the lifting section 2 and a ground fault occurs, the ground fault current mainly flows through the ground contact 9, and the ground fault current flows through the wire rope 3. Since the short circuit current is almost eliminated, there is no possibility that the wire rope 3 will melt due to the ground fault current and the electric appliance 1 and the lifting section 2 will fall, and safety can be sufficiently ensured.

[Effect of idea]

The present invention is constructed as described above, and a ground contact connected to the ground wire is provided on the lower surface of the fixed part, and when the power terminal of the lifting part comes into contact with the power contact of the fixed part, the ground contact of the lifting part Because it comes into elastic contact with the housing, if a ground fault occurs due to the ungrounded side of the power supply coming into contact with the housing of the lifting section, the ground fault current will flow through the ground contact, and the This has the effect that the rope will not be fused by ground fault current, and a safe lifting device can be provided.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a conventional example, FIG. 2 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 3 is a sectional view of the same.
FIG. 4 is a schematic top view of the main parts same as above. 1 is an electric appliance, 2 is a lifting part, 3 is a wire rope, 4 is a winding means, 5 is a fixed part, 6 is a ground wire, 7a, 7b are power terminals, 8a, 8b are power contacts, 9 is a ground contact, 10 is a housing.

Claims (1)

[Scope of utility model registration request] It consists of an elevating section to which electrical equipment such as lighting equipment is attached, and a fixed section having winding means for winding the wire rope that suspends the elevating section. In a lifting device configured to supply power for operating an electric appliance from a fixed part to a lifting part by contacting a power contact provided on the lower surface, a ground contact connected to a ground wire is provided on the lower surface of the fixed part, A lifting/lowering device configured such that when a power supply terminal contacts a power supply contact, the ground contact comes into elastic contact with a housing of a lifting/lowering section.