JPH059831Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a slip-spooling device for a cord winding reel, which is equipped with a rotating drum for winding a multi-core cord, for example, a six-core electric cord.

[Conventional technology]

A cord winding reel used to supply a relatively large current to an electrical load includes a rotating drum for winding a multicore electrical cord, and a drum support that pivotally supports the rotating drum. Since the drum rotates to wind in and unwind the electrical cord, a slip ring device is provided that maintains electrical continuity between the rotating member and the stationary member while rotating relative to each other.

Conventionally, as a slippling device for a cord take-up reel as described above, a flat plate is provided with a stationary reel shaft made of an electrical insulator with a spline groove formed therein, and a terminal piece extending in the axial direction that fits into the spline groove. A plurality of pairs of a conductive stationary ring shaped like a conductive stationary ring and a conductive rotating ring that is in surface contact with the conductive stationary ring are externally fitted through an electrically insulating ring, and a member (conductive stationary ring and conductive rotating ring) externally fitted to the reel shaft is a ring, an electrically insulating ring, etc.) in the axial direction of the reel shaft by the spring force of a coil spring, and a means for restraining the rotation of the rotary ring relative to the drum; A technique disclosed in Japanese Utility Model Publication No. 63-9115 is known in which a fixed conductive stationary ring fitted in a groove and a conductive rotary ring rotating together with the drum are configured to be electrically connected to each other in each pair.

[The problem that the idea attempts to solve]

The conventional slip ring device for a reel clamps members (a plurality of sets of conductive stationary rings, conductive rotating rings, and electrically insulating rings) that are fitted onto the reel shaft in the axial direction of the reel shaft using a coil spring. Therefore, if there is some play between the reel shaft and the external fitting member, and a tensile force is applied to the cord connection part of the conductive rotating ring in the direction of the reel axis (the drum take-up cord does not rotate The inner end of the winding on the drum is inserted through the drum hole and connected to the terminal of the conductive rotating ring, so if you forcefully pull the drum winding cord with it pulled out to the end,
A tensile force that scoops the conductive rotating ring in the direction of the reel axis is applied to the cord connection part of the conductive rotating ring at the position where it receives the tensile force). A short circuit problem occurs between the slip rings in which the conductive stationary ring tilts in the direction of the reel axis and comes into contact with an adjacent non-tilting rotating ring of another set.

Further, such a problem also occurs when a tensile force is applied to the extending terminal piece of the conductive stationary ring so as to lift the terminal piece from the spline groove of the reel shaft. That is, the conductive stationary ring, the conductive rotating ring, and the electrically insulating ring are fitted onto the reel shaft as a pair adjacent to each other, and the extending terminal piece of the stationary ring is connected to the conductive ring of the other pair located on the front side in the adjacent direction. Since it is inserted into the spline groove of the reel shaft so as to pass through the inside of the stationary ring and the conductive rotating ring, the tensile force of the power cord connected to the extending terminal piece of the conductive stationary ring (impact on the cord take-up reel) When the terminal piece is bent from the base side so as to lift up from the spline groove of the reel shaft, this terminal piece will be bent from the other stationary ring and the other rotating ring. A short circuit problem occurs between the slip rings as they touch the inner edges.

Furthermore, the conventional slip-ring device requires a coil spring to bias the off-axis fitting member, which increases the assembly dimension of the entire device in the axial direction, and the spring force of the spring is strong. However, the slip rings (conductive stationary ring and conductive rotating ring) have poor rotatability and wear problems.

The object of this invention is to provide a slip-spooling device for a cord winding reel that solves the above-mentioned conventional problems.

[Means to solve the problem]

In order to achieve the above object, the slip ring device of the present invention has a plurality of spline grooves 8a, 8.
a reel shaft 2 made of an electrical insulator and fixed to the drum support 1; a center hole 11 rotatably fitted on the outside of the reel shaft 2; and a center hole 11 having a diameter larger than the center hole. a plurality of ring holders 10 formed of an electrical insulator having a circular recess 12 concentric with the center hole 11 and an end face notched groove 13 communicating with the circular recess and opening on the outer periphery; a holder coupling means 15 for fastening and fixing the ring holder 10 so that the ring holder 10 is adjacent to the end surface in the axial direction of the reel shaft 2, and for restraining the ring holder 10 to the rotating drum 4 so as to rotate together with the drum; It has an axially extending terminal piece 25a that fits into the spline grooves 8a, 8b, 8c, . A plurality of conductive stationary rings 2 each having a flat plate shape.
5, a spring-forced bulging ring portion 27 that is pressed against the flat plate surface of the conductive stationary ring 25, and a radially extending terminal piece 28 that projects outward from the ring portion.
A circular recess 12 of each ring holder 10 is formed so that the ring portion 27 comes into elastic contact with both flat plate surfaces of the conductive stationary ring 25 and the terminal piece 28 projects outward from the holder through the holder notch groove 13. a fixed conductive stationary ring 25 that is groove-fitted to the reel shaft 2; Due to the elastic sliding contact with the conductive rotating ring 26 rotating together with the drum 4 and the ring holder 10, the external power supplied to the conductive stationary ring 25 is connected to the extending terminal piece 28 of the conductive rotating ring 26.
It is characterized in that it is electrically connected to the drum winding cord 5 connected to the drum winding cord 5.

[Effect]

In the slip ring device having the above configuration, the power cord 24 is connected to the extending terminal piece 25a of the conductive stationary ring 25, and the wound inner end of the drum winding cord 5 is connected to the extending terminal piece 28 of the conductive rotating ring 26. Due to the elastic sliding contact between a fixed conductive stationary ring 25 fitted in a groove on the reel shaft 2 and a conductive rotating ring 26 that rotates together with the drum 4 and ring holder 10, Conductive stationary ring 25
It becomes possible to electrically conduct an external power supply supplied to the drum winding cord 5 connected to the extending terminal piece 28 of the conductive rotating ring 26.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings. This embodiment shows a cord winding reel slip-slinging device configured for a 6-core cord. A reel shaft 4 integral with a connecting shaft 3 fixedly attached to the reel shaft 2 is a rotating drum that is rotatably supported on the drum support 1 by the reel shaft 2, and this rotating drum 4 swirls a six-core electric cord 5 It is configured to be wound around the outer periphery of the drum by the rotational driving force of a spring (not shown). The reel shaft 2 is a hollow shaft made of an electrical insulator such as synthetic resin, and has a flange-like stopper 6, a snap ring groove 7, and six spline grooves 8a to 8f extending in the axial direction on its outer periphery. They are provided as shown in FIGS. 2 and 3.

10 is 6 made of an electrical insulator such as synthetic resin.
ring holders (only two of which are shown in FIG. 3), each ring holder 10
The center hole 11 is rotatably fitted to the outside of the reel shaft 2, and the center hole 11 has a larger diameter than the center hole 11.
It has a circular recess 12 concentric with the circular recess 12, an end face notch groove 13 that communicates with the circular recess 12 and opens on the outer periphery, and notch holes 14 recessed at six locations on the outer periphery (5th
(see figure).

15 connects the plurality of ring holders 10 to the reel shaft 2
As shown in FIG. 1, the holder is fastened to the drum 4 so that the end faces of the drum 4 are adjacent to each other in the axial direction, and the holder is restrained to rotate together with the drum 4. In this embodiment, this holder coupling means 15 has a plurality of (six) pillar insertion holes 16a.
a spacer ring 16 which is externally fitted onto the reel shaft 2 and supported by a flange-shaped stopper 6 as shown in FIG. The settling ring 18 held between the snap ring groove 7
a snap ring 17 that is fitted into the set ring 17 to prevent the set ring 18 from moving in the axial direction via a round washer 19 and a Teflon washer 20; and a notched hole in the outer periphery of each ring holder 10 that projects from the set ring 18 14 and the pillar insertion hole 16a of the spacer ring 16, and a plurality of pieces (six pieces) whose tips are inserted into the side plate hole 4a of the rotating drum 4 as shown in FIG.
The ring holder 10 is screwed into the pedestal 21 of the pedestal 21 and the three pedestal screw parts 21a in the pedestal 21 and tightened in the axial direction so as to sandwich the ring holder 10 between the spacer ring 16 and the set ring 18. It is composed of three nuts 22 for fixing.

Reference numeral 25 indicates six conductive stationary rings (only two of which are shown in FIG. 3) which are assembled into the circular recess 12 of each ring holder 10 and fitted onto the reel shaft 2. The stationary ring 25 has a flat plate shape, and is connected to the spline grooves 8a to 8 of the reel shaft 2.
It has an axially extending terminal piece 25a that fits into the axially extending terminal piece 25a.

Reference numeral 26 denotes six pairs of two conductive rotating rings (only two of which are shown in FIG. 3), and each of the conductive rotating rings 26 is pressed against the flat surface of the conductive stationary ring 25. A bulging ring portion 2 with a spring force and having a bowl-shaped bulging shape as shown in FIG.
7 and a radially extending terminal piece 28 protruding outward from this bulging ring portion 27, and the ring portion 27 is arranged in line contact with both flat plate surfaces of the conductive stationary ring 25 in FIG. The circular recess 12 of each ring holder 10 is arranged such that the terminal pieces 28 are brought into elastic contact as shown in FIG.
The reel shaft 2 is assembled into the reel shaft 2 and externally fitted onto the reel shaft 2. A fixed conductive stationary ring 25 is groove-fitted on the reel shaft 12, and a conductive rotating ring 2 rotates together with the drum 4 and ring holder 10.
An external power source (conductive stationary ring 2
5) is connected to the conductive rotating ring 2.
The drum winding cord (electrical cord 5) connected to the extending terminal piece 28 of No. 6 is connected to the drum winding cord (electrical cord 5).

Although the above embodiment describes a slip ring device configured for a 6-core cord, it is also applicable to a 3-core, 4-core
It is also possible to configure it as a slip-ring device for a reel for a multi-core cord, such as a 5-core cord or a 5-core cord.

[Effect of idea]

In the cord winding reel slip-ring device according to this invention, a plurality of ring holders 10 made of an electrical insulator are fastened and fixed to the outside of the reel shaft 2 in an adjacent state of end face contact, and are integrated with the rotating drum 4. The ring holder 10 is designed to rotate, and a conductive stationary ring 25 and a pair of conductive rotating rings 26 are individually incorporated in an electrically isolated internal space (circular recess 12). This completely eliminates the problem of electrical short circuits that existed in the past.

Further, the plurality of sets of two conductive rotating rings 26 that are fitted onto the reel shaft 2 include a bulging ring portion 27 with a spring force that is pressed against the flat plate surface of the conductive stationary ring 25; The ring portion 27 is in elastic contact with both flat plate surfaces of the conductive stationary ring 25, and the terminal piece 28 extends outward from the holder through the holder notch groove 13. Since the ring holder 10 is built into the circular recess 12 of each ring holder 10 so as to protrude, the coil spring for biasing the off-axis fitting member, which was indispensable in the past, is omitted, and the By reducing the assembly dimensions, it is possible to improve the rotational performance of the slip ring device, and to solve the problem of wear.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of a cord take-up reel slip-spooling device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line - in FIG. 1, and FIG.
The figure is an exploded perspective view of the slip-ring device.
5A and 5B are explanatory views of the structure of the conductive rotating ring, and FIGS. 5A and 5B are explanatory views of the structure of the ring holder. 1...Drum support body, 2...Reel shaft, 4...
Rotating drum, 5... Drum winding cord (electrical cord), 6... Stopper, 8a to 8f... Spline groove, 10... Ring holder, 11... Center hole,
12...Circular recess, 13...End face notch groove, 14...
...Outer circumferential cutout hole, 15...Holder coupling means, 16...
...Spacer ring, 17...Snat spring, 1
8...Settling, 19...Round washer, 20...
Teflon washer, 21... pedestal, 22... nuts,
24...Power cord, 25...Conductive stationary ring,
25a...Extending terminal piece of conductive stationary ring, 26...
...Conductive rotating ring, 27...Bulging ring portion, 28
...Extended terminal piece of conductive rotating ring.

Claims (1)

[Scope of utility model registration request] A cord winding reel slip-spooling device comprising a rotating drum for winding a multicore electric cord and a drum support for pivotally supporting the rotating drum, the drum support having a plurality of spline grooves. A reel shaft made of a fixed electrical insulator, a center hole rotatably fitted to the outside of the reel shaft, a circular recess with a diameter larger than the center hole and concentric with the center hole, and the circular recess. A plurality of ring holders formed of an electrical insulator have end face notch grooves communicating with each other and opening on the outer periphery, and the plurality of ring holders are arranged adjacent to each other in the axial direction of the reel shaft with end face joints. Each ring holder has a holder coupling means for fastening and fixing and restraining the drum so as to rotate together with the drum, and a terminal piece extending in the axial direction to fit into a spline groove of the reel shaft. a plurality of flat conductive stationary rings that are assembled into a circular recess and fitted onto the reel shaft; a bulging ring portion with a spring force that is pressed against the flat plate surface of the conductive stationary rings; The terminal piece has a radially extending terminal piece that projects outward from the ring part, the ring part comes into elastic contact with both flat plate surfaces of the conductive stationary ring, and the terminal piece projects outward from the holder through the holder notch groove. a plurality of sets of two conductive rotating rings that are assembled into a circular recess of each ring holder and externally fitted onto the reel shaft; A drum in which an external power supply supplying power to the conductive stationary ring is connected to an extended terminal piece of the conductive rotary ring by resilient sliding contact between the stationary ring and a conductive rotary ring that rotates together with the drum and the ring holder. A slip-ring device for a cord take-up reel which is electrically connected to the take-up cord.