JPS6330093Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] This invention relates to a device for lifting and lowering electrical appliances, such as a device for lifting and lowering electric lights in a suspended manner from the ceiling.

[Background technology]

In FIG. 1 showing a conventional example, 1 is a fixed frame on the ceiling side, 2, 2 are fixed contacts, 3 is a guide tube, 4 is a guide groove, 5 is a lamp (part), 6,
6 is a movable contact supported by springs 7, 7, 8 is a guide rod, 9 is a guide pin, and 10 is a hanging cable (wire or rope). The two sets of corresponding contacts 2, 6, 2, 6 must be in reliable contact with each other when the lamp 5 is fixed at its upper limit. In this conventional example, since the lamp 5 is suspended by a single cable 10, the lamp 5 rotates when it is suspended. A guide mechanism as shown in the figure is used to prevent this turning as it ascends and to ensure accurate positioning, but this has the problem of a complicated structure and bulky device. Since the corresponding contacts 2 and 6 are in perpendicular contact with each other, there is no effect of removing dirt from the contact surfaces, and there is a problem in that the dirt becomes worse over time and has a negative effect on the energization state. Another conventional example is Utility Model Publication No. 56-1047, but it has the same drawbacks as mentioned above.

[Purpose of invention]

The purpose of this invention is to provide a lifting device for electric appliances that can simplify the structure by eliminating the need for a guide mechanism, and can also clean the surfaces of the contacts.

[Disclosure of invention]

The elevating device for electric appliances of this invention has a fixed part having a pair of contacts on the lower surface, and a contact point on the upper surface that is suspended by a pair of cables pulled down from the fixed part and contacts the contacts when rising. In the lifting device for an electric appliance, the contact point of the fixed part and the contact point of the electric appliance are respectively disposed on a circumference centered on the center between the cables, and the contact point of the fixed part and one of the contacts of the electric appliance is a movable side, and the peripheral surface of at least one of the contacts of the fixed part and the contact of the electric appliance is formed into a tapered tip, and further, The present invention is characterized in that an insulator is provided on at least the circumference of the upper surface.

According to the structure of this invention, since the electric appliance is suspended from two points, it does not turn like in the past, and even if it sways horizontally, when it reaches the upper limit, it
Because it is a point suspension, the position of each contact on the appliance side matches the position of each contact on the fixed frame side, and even without the complicated guiding mechanism of the conventional structure, the corresponding contacts on the top and bottom can be easily connected to each other. Make precise contact. Even if the contacts do not make contact, it is safe because an insulator is provided on the appliance side. Furthermore, since one of the contacts has a tapered peripheral surface, the contacts can smoothly come into contact with each other when the electric appliance is lowered a little to bring them into contact again if they do not make contact with each other.

When the corresponding contacts on the upper and lower sides start contacting each other, the corresponding contacts on the upper and lower sides slide into contact with each other in the horizontal direction, because there is still some horizontal shaking of the electric appliance and because one pair of contacts is a movable contact. As a result, dirt is removed from both contacts (cleaning effect), and a brake is applied to prevent the electric appliance from swaying, so that both contacts are brought into pressure contact with each other in precise contact as described above.

An embodiment of this invention will be explained based on FIGS. 2 to 5. In the figure, 11 is a fixing frame of a fixing part on the ceiling side, 12 is a lamp which is an electric appliance (only a portion is shown), and 13 is a cable (wire or rope) for raising and lowering the lamp 12. This cable 13
One end 13a thereof is fixed to the fixed frame 11, and the other end is wound around the winding drum 14. The cable 13 suspends the lamp 12 at two points.
15, 15 is a pulley on the fixed frame 11 side, 16,
16 is a pulley on the lamp 12 side. 17 is the light fixture 12
A pair of fixed contacts 18, 18 are held on this insulator 17. The fixed contacts 18, 18 have peripheral edges that are tapered surfaces 18a, 18a that widen toward the end. 19 is contact 18
20 is a nut, and 21 is a lead wire.

22, 22 are insulating sockets fitted to the lower surface of the fixed frame, into which the rods 24, 24 of the movable contacts 23, 23 are slidably inserted;
25 urges the movable contacts 23, 23 to protrude. Numerals 26 and 26 are nuts, and 27 is a lead wire.

When the drum 14 is rotated and the rope 13 is wound up,
The lamp 12 moves in parallel while shaking horizontally, and as a result, the fixed contacts 18, 18 move to the movable contacts 23, 23.
Slide into contact several times. Since the fixed contacts 18, 18 have tapered surfaces 18a, 18a, the movable contacts 23, 23
Boarding is smooth. Through this sliding contact, each contact point 18, 23... is polished, while the lamp 1
Apply the brakes to prevent lateral shaking. When the cable 13 is further wound up, the lamp 12 rises with the upper and lower contacts 23, 18 facing each other, and the springs 25, 25 are compressed, so that the upper and lower contacts 23, 18, . . . are strongly pressed against each other.

In addition, even if the lamp 12 is raised while the electricity is still on, the upper end surface of the lamp 12 is entirely covered with the insulator 17, so even if the contact is shifted, a ground fault will not occur.

As another embodiment of this invention, instead of forming the tapered surface 18a on the fixed contact 18, or in addition to forming the tapered surface 18a, it is also possible to form a tapered surface on the movable contact 23. Further, instead of making the line connecting the two points suspended by the cable 13 orthogonal to the line connecting the fixed contacts 18, 18, these lines may be made parallel to each other. Also, one cable 1
3, two ropes may be used instead of hanging from two points. Furthermore, the vertical relationship between the fixed contact and the movable contact may be reversed.

[Effect of idea]

According to the device for lifting and lowering electric appliances of this invention, since the insulator is provided at least on the circumference of the upper surface of the electric appliance, the contacts on the fixed part side and the contacts on the electric appliance side do not come into contact with each other when the electric appliance rotates. Moreover, since the peripheral surface of either side of the contact is tapered, it is possible to ride the contact smoothly, and the surface of the contact can be polished by the shaking of the electric appliance when the contact connects and separates. Moreover, since the conventional guide mechanism is not required, the structure is simple.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is a schematic configuration diagram of an embodiment of this invention, Fig. 3 is a sectional view thereof, and Fig. 4 is a perspective view of a conventional example.
The figure is a perspective view, and a and b in FIG. 5 are explanatory views of the operation. DESCRIPTION OF SYMBOLS 11... Fixed frame of a fixed part, 12... Light fixture which is an electric appliance, 13... Cable, 17... Insulator, 18... Fixed contact, 18a... Tapered surface, 2
3...Movable contact.

Claims (1)

[Scope of utility model registration request] Lifting and lowering of an electrical appliance comprising a fixed part having a pair of contacts on the lower surface, and an electrical appliance having a contact on the upper surface that is suspended from a pair of cables pulled down from the fixed part and contacts the contacts when rising. In the device,
The contacts of the fixed part and the contacts of the electric appliance are respectively arranged on a circumference centered on the center between the cables, and one of the contacts of the fixed part and the contacts of the electric appliance is arranged on a movable side. and the peripheral surface of at least one of the contacts of the fixing part and the contacts of the electric appliance is formed into a tapered shape with a tapered tip, and an insulator is provided on at least the circumference of the upper surface of the electric appliance. A device for lifting and lowering electrical appliances.