JP319I - Slip ring device for reels - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slip ring device provided on a reel for an electric cord. The reel for electric wire includes a rotating drum for winding the cord and a bracket which is a fixing member for supporting the shaft of the drum. Since the above-mentioned rotary drum rotates to wind the cord and unwind it, a means for maintaining electrical continuity while rotating relatively between the rotary member and the stationary member is required. Conventionally, a combination of a slip ring made of a conductor having a cylindrical surface and a brush that slides on the slip ring has been generally used as the means for maintaining conduction while rotating. However, in the above-mentioned conventional technique, when the cord is multi-core, since the same number of slip rings and brushes as the number of core wires are arranged along the rotation axis, the length in the axial direction becomes large, and the entire reel device is There was a problem that it could be closed if it was large. This problem is particularly remarkable when the number of core wires is large and the current carrying capacity is large. However, technical requirements for reels are often three cores or multiple cores, and moreover require a current carrying capacity of several amperes or more. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reel slip ring for a multi-core cord, which can carry a relatively large current and has a short axial dimension. . The basic principle of the present invention is that the rotating conductor and the stationary conductor have a relatively large sliding contact area and the axial dimension is reduced. And they are alternately laminated in a multi-plate clutch shape via electrical insulating rings. In order to achieve the above-mentioned object based on the above principle, the present invention provides a stationary shaft having a spline groove formed of an electric insulator, and a conductor made of a conductor having internal teeth fitted into the spline groove of the stationary shaft. A pair of flat plate-shaped stationary ring and a flat plate-shaped rotating ring made of a conductor having no internal teeth that fits into the spline groove of the stationary shaft are loosely fitted to the stationary shaft through plural electric insulation rings. A means for fitting and pressing these flat rings in the axial direction of the stationary shaft, a flat plate rotating ring made of a conductor without the inner teeth, and a conductive member having the inner teeth stationary with the stationary shaft. It is characterized in that the flat plate-shaped stationary ring made of a body is electrically connected for each pair. Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of the reel slip ring of this embodiment including the axial center thereof, FIG. 2 is a sectional view taken along line XX shown in FIG. 1, and FIG. 3 is a reel slip ring device of this embodiment. It is an exploded perspective view. This embodiment is an example of a reel slip ring device assembled for a three-core cord by using a member formed for a four-core cord. As shown in FIG. 3, four spline grooves 1a, 1b, 1
The stationary shaft 1 having c and 1d is formed of an electrically insulating material such as synthetic resin. Reference numeral 2 is a flange-shaped stopper integrally formed near the central portion of the stationary shaft 1, 3 is a snap ring groove, and 1e is a concentric hollow portion. A flat plate-shaped stationary ring made of a conductor having internal teeth that fits into the spline groove of the stationary shaft 1 is configured. This flat plate-shaped stationary ring may be a circular washer-shaped member with a tongue having at least one internal tooth 4 as shown in FIG. In this embodiment, a copper plate is punched into a shape in which the inner teeth are extended as shown in FIG. 5, and the inner teeth 5 are formed at the root portions by bending as shown in FIG. 6 so that the tip portions 6 can be used as conductive rods. To configure. 6a is a screw hole for connecting an electric wire. Although the notch 7 is formed in the annular portion by the above-mentioned configuration, it does not cause a functional problem when used as will be described later. In this embodiment, three flat plate-shaped stationary rings (hereinafter abbreviated as stationary rings) made of a conductor and configured as shown in FIG. 6 are provided. For the sake of convenience of description, these three stationary rings are named stationary rings 8a, 8b, and 8c, respectively. Three flat plate-shaped rotating rings made of a conductor having no internal teeth that fit into the spline grooves of the stationary shaft 1 are configured, and are named rotating rings 9a, 9b, and 9c, respectively, for convenience of description. As shown in FIG. 3, the rotating ring 9a has a circular washer shape having an inner diameter that is loosely fitted to the stationary shaft 1 and an outer diameter that is larger than that of the stationary ring 8a.
0 and four notches 11 for restraining rotation are provided, and a copper plate is punched out. 10a is a screw hole for connecting an electric wire. The rotating rings 9b and 9c have the same structure as the rotating ring 9a. Reference numeral 12 is an electrical insulating ring. An inner diameter loosely fitted to the stationary shaft 1 by an appropriate insulating material such as synthetic resin, and a stationary ring 8a.
To form a circular washer-shaped ring having an outer diameter approximately equal to. A circular washer-shaped pressure ring 13 having an outer diameter that is substantially the same as that of the rotating rings 9a to 9c is formed of an electrically insulating material such as synthetic resin, and the pressure ring 13 has the above-mentioned notches 11, 11 formed therein.
The pillars 14, 14 that engage with ... Are integrally molded. Reference numeral 15 is a coil spring, 16 is a washer, and 17 is a snap ring. Inner teeth 5 of the stationary ring 8a in the spline groove 1a of the stationary shaft 1
Are fitted to fit the stationary ring 8a onto the stationary shaft 1 and brought into contact with the stopper 2. Then, the rotating ring 9a is externally fitted to the stationary shaft 1, and then the electrically insulating ring 12 is externally fitted.
As a result, the stationary ring 8a and the rotating ring 9a come into contact with each other and are fitted onto the stationary shaft. Then, similarly to the above, the inner teeth of the stationary ring 8b are fitted into the spline groove 1b to fit the stationary ring 8b onto the stationary shaft 1, and then the rotating ring 9
b, the electrical insulating ring 12 is fitted on the stationary shaft 1 outside. Furthermore,
The stationary ring 8c and the rotating ring 9c are similarly set to the stationary shaft 1.
To fit on. The three rotating rings 9a, 9b, 9c are rotated to align the respective notches 11, and the pedestals 14 from the pressure ring 13 are engaged with these notches so that the pressure ring 13 is attached to the stationary shaft 1. Fit. The washer 16 and the coil spring 15 are externally fitted behind the pressure ring 13, and the snap ring 17 is fixed to the snap ring groove 3. As is apparent from the above configuration, the three stationary rings 8
Since the internal teeth of a, 8b, and 8c are fitted in the spline grooves, the rotation thereof is restricted by the stationary shaft 1.
Further, since the three rotating rings are engaged with the pillars 14 in the notches 11, the rotation thereof is restricted by the pressure ring 13. As described above, the stationary shaft 1 has a pair of the stationary ring 8a and the rotating ring 9a, a pair of the stationary ring 8b and the rotating ring 9b, and a pair of the stationary ring 8c and the rotating ring 9c. Is externally fitted via the electrical insulating ring 12, sandwiched by the stopper 2 and the pressure ring 13, and pressed by the coil spring 15. FIG. 1 shows a pair of the stationary ring 8b and the rotating ring 9b among the three pairs assembled to the stationary shaft 1, and omits the other two pairs. The stationary shaft 1 is fitted to the drum shaft 18 of the reel device, and the rotation stop washer 19 and the mounting screw 20 prevent the bracket 21 of the reel device from rotating. As a result, the stationary shaft 1 and the stationary rings 8a, 8b, 8c are connected to the drum shaft 18
The rotation centered around is constrained to stand still. A hole 23 provided at the drum 22 of the reel device is provided with the tip of the pedestal 14 engaged with the notch 11 of the rotating rings 9a, 9b, 9c.
To fit. As a result, the pressure ring 13 and the rotating rings 9a, 9b, 9c are restrained from rotating with respect to the drum 22, and when the drum 22 rotates, it rotates together with it. Reference numeral 24 is a cover having a shape that covers the shaft end of the stationary shaft 1, and 25 is a hole for inserting an electric cord. As shown in FIG. 3, the core wires of the three-core cord 26 wound around the drum of the reel are respectively rotated by the rotary rings 9a, 9b, 9
The core wires of the three-core cord 27 on the power supply side of the reel are connected to the tips of the conductive rod portions of the stationary rings 8a, 8b, 8c, respectively. As can be easily understood from FIG. 3, in this embodiment, the stationary shaft 1 is provided with four spline grooves, so that when a pair of a stationary ring and a rotating ring is additionally assembled, it is 4 It can be used as a slip ring device for a core cord reel. Further, by increasing the number of spline grooves provided on the stationary shaft 1, adding a pair of a stationary ring and a rotating ring, and assembling via a electrically insulating ring, it is possible to easily adapt to a multi-core cord having five or more cores. Further, since the stationary ring and the rotating ring in the present invention are flat plates, the dimension in the axial direction can be kept small even if they are constructed in a multi-pole type. In addition, the stationary ring has a large current capacity because one side of the stationary ring is in intimate contact with the rotating ring and slides against it. Further, if the diameter of the rotating ring is appropriately increased, it functions as a heat radiating fin to prevent seizure of the sliding contact surface. In this embodiment, the sliding contact area of one set of the stationary ring and the rotating ring is about 2 cm ² ,
It was confirmed that a current of 15 amperes can be safely and reliably energized. As described above in detail, when the present invention is applied, an excellent practical effect that the size of the reel slip ring device for a multi-core cord in the axial direction can be reduced and the energizing capacity can be increased can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 show one embodiment of a slip ring device for a reel of the present invention, FIG. 1 is a sectional view including an axis, and FIG. 2 is shown in FIG. XX sectional view, FIG. 3 is an exploded perspective view,
4 is an explanatory view of the shape of the stationary ring, FIG. 5 is an explanatory view of the punched shape of the stationary ring, and FIG. 6 is a perspective view of the stationary ring. 1 ... Stationary shaft 1a, 1b, 1c ... Spline shaft 2 ... Stopper, 3 ... Snap ring groove 4, 5 ... Inner teeth, 6 ... Conductive rod portion 6a ... Screw hole, 7 ... Notch 8a , 8b, 8c ... Stationary ring 9a, 9b, 9c ... Rotating ring 10 ... Projection, 10a ... Screw hole 11 ... Notch, 12 ... Electrical insulation ring 13 ... Pressure ring, 14 ... Pillar 15 ... Coil spring, 16 ... Washer 17 ... Snap ring 18 ... Reel drum shaft 19 ... Rotation washer, 20 ... Mounting screw 21 ... Bracket, 22 ... Reel drum 23, 25 ... Hole, 24 ... Cover 26, 27 ... 3-core cord

Claims (1)

[Correction specification] [Claims for utility model registration] [Claim 1] In a slip ring of an electric cord reel, a stationary shaft made of an electric insulator having a spline groove is fitted to the spline groove of the stationary shaft. A pair of a conductor-made flat plate-shaped stationary ring having internal teeth to be fitted, and a pair of a conductor-made flat plate-shaped rotating ring having no inner teeth which fits into the spline groove of the stationary shaft, through an electrically insulating ring. Means for externally fitting a plurality of sets and clamping the members fitted on the stationary shaft in the axial direction of the stationary shaft, and means for restraining rotation of the flat plate-shaped rotating ring having no internal teeth with respect to the reel drum And a flat plate-shaped rotating ring made of a conductor having no internal teeth that rotates together with the reel drum, and a flat plate-shaped stationary ring made of a conductor having internal teeth that are stationary together with the stationary shaft are provided for each pair. Special feature to do continually Reel for the slip ring device to.