JPH0415746Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a cord reel equipped with a current collector, and particularly to a cord reel with an improved structure of the current collector.

[Prior Art] Conventionally, when performing work that requires electricity in a location far from a power outlet, a cord reel, in which a long cord is wound around a drum, has been conveniently used. . The most popular cord reel is one in which a plug is attached to the tip of a wound cord. To use this type, insert the plug at the end of the cord into a power outlet, rotate the drum and pull out the cord, move the drum body to the desired position, and extract electricity from the outlet attached to the drum. used.

However, it is difficult to use this type of cord reel when working at a high place or underground because the drum body must be carried to the working position. As a cord reel used in such a case, there is a cord reel called a reverse feeding type.

FIG. 4 shows a perspective view of a conventional reverse-feeding type cord reel. In FIG. 4, on both sides of the winding drum 2,
Side plates 3 and 4 are provided, and a winding cord 5 is wound around the winding drum 2. The winding drum 2 is rotatably supported by a shaft 7 provided on the side of the support leg 6. One end of a cord 8 is disposed within the shaft 7, and a plug 9 is attached to the other end of the cord 8. code 8
is electrically connected to the wound cord 5 by a current collector (not shown in FIG. 4) mounted on the shaft 7 within the winding drum 2.

FIG. 5 shows a sectional view taken along the - line of the conventional reverse-feeding type cord reel 1 shown in FIG. 4. As shown in FIG. In FIG. 5, a slip ring holder 11 of a current collector 10 is mounted on the shaft 7. The slip ring holder 11 is locked to the shaft 7 by a locking pin 17. On the circumferential surface of the slip ring holder 11, two slip ring electrodes 12 made of metal are arranged in parallel. Each of the slip ring electrodes 12 includes
Cord wires 8a and 8b of a cord 8 inserted into the shaft 7 are connected. A graphite brush 13 is located on the outside of the slip ring electrode 12 and is in contact therewith. The graphite brushes 13 of each of the two slip ring electrodes 12 are located on both sides of the shaft 7. The graphite brush 13 is held in a brush holder 14, and the brush holder 14 is attached to the side plate 3.
It is supported by a support member 16 attached to. A coil spring 15 is provided in the brush holder 14, and the graphite brush 13 is pressed against the slip ring electrode 12 by the coil spring 15. Brush holder 1
Cord wires 5a and 5b, which are one ends of a winding cord 5 inserted into the winding drum 2, are connected to each of the cord wires 4. Since the brush holder 14 is made of metal, it conducts electricity from the graphite brush 13.

FIG. 6 is a front view of a current collector used in the conventional back-feed type cord reel shown in FIG.
In FIG. 6, two slip ring electrodes 12
are shown as one because they overlap each other. The graphite brush 13 on the right side of FIG. 6 is in contact with the slip ring electrode 12 on the back side of the drawing, and the graphite brush 13 on the left side is in contact with the slip ring electrode 12 on the front side of the drawing.
is in contact with

Returning to FIG. 4, the method of using the reverse feeding type cord reel will be explained. In use, first insert the plug 9 of the cord 8 into a power outlet, and connect the outlet (not shown) attached to the tip of the wrapped cord 5 to the wrapped cord 5 while rotating the winding drum 2.
is pulled out and moved to a desired position, and electricity is taken out and used from the outlet at the tip of the moved wrapped cord 5.

When supplying electricity using the cord of a reverse-feeding type cord reel, there is no need to move the drum body, and only the plug at the end of the wrapped cord needs to be moved, which is convenient when working at heights, etc. be.

The operation of the current collector as the drum rotates will be explained with reference to FIG. As the wrapped cord 5 is pulled out, the winding drum 2 and side plates 3 and 4 rotate. The graphite brush 13, which is supported by a support member 16 attached to the side plate 3, slides on the slip ring electrode 12 while making contact with this rotation. Since the slip ring holder 11 is locked to the shaft 7 by the locking pin 17, it remains stationary without rotating when the drum rotates.

Even when the drum rotates, the slip ring electrode 12 and the graphite brush 13 are in contact with each other, so the electricity supplied from the cord 8 passes through the slip ring electrode 12 and the graphite brush 13 and is supplied to the winding cord 5. Ru.

[Problems to be Solved by the Invention] As described above, the back-feeding cord reel is kept energized by the contact between the slip ring electrode and the graphite brush within the current collector.

However, in the conventional back-feed type cord reel current collector, one slip ring electrode is supported by the shaft, and the other graphite brush is supported by the side plate. Therefore, if the side plate is deformed due to an impact, etc., the mounting position of the graphite brush will shift, creating a gap between the graphite brush and the slip ring electrode, and the graphite brush and slip ring electrode will not come into contact with each other, making it impossible to conduct electricity. This caused a problem. Further, even when the side plate is not deformed, the vibration of the side plate during rotation is transmitted to the contact area between the graphite brush and the slip ring electrode, and has an adverse effect on the current conduction state.

Furthermore, the current collector of the conventional back-feeding type cord reel uses graphite, which has a relatively high electrical resistance, and has the problem of generating heat during use. Because of this heat generation, conventional reverse-feeding type cord reels cannot be used for long periods of time, and the standard capacity that can be energized is small. Furthermore, since graphite is expensive, it also has the disadvantage of increasing manufacturing costs.

Therefore, an object of this invention is to provide a cord reel that does not deteriorate the current conduction state even if the side plate is deformed, generates almost no heat due to contact resistance during use, and can be manufactured at low cost.

[Means for Solving the Problems] The cord reel of this invention includes a winding drum around which a cord is wound, a support leg having a shaft that rotatably supports the winding drum, and a rotating part in the winding drum. A cord reel with a current collector that includes a current collector for conducting current between a stationary part, and the current collector includes a metal annular electrode, an annular electrode holder that holds the annular electrode, It has a metal brush made of an elastic metal and is provided so that its convex portion is in contact with the surface of the annular electrode, and a brush holder that holds the metal brush. A cylindrical protrusion extending substantially perpendicularly to the holding surface of the holder is formed in the center of the holder, and a fitting hole large enough to fit the cylindrical protrusion is formed in the center of the other holder. An engagement hole is formed on the outer periphery of the winding drum for loosely fitting one end of the engagement pin fixed to the side plate of the winding drum. The current collector is assembled by fitting the cylindrical protrusion into the hole, and in this assembled state, the current collector is attached to the shaft by fitting the shaft into the cylindrical protrusion and attaching it to the stationary part inside the winding drum. At the same time, one end of the engagement pin on the side plate of the winding drum is fitted into the engaging hole so that one of the annular electrode holder and the brush holder rotates with the rotation of the rotating part in the winding drum. It is characterized by being installed inside the winding drum.

[Function] The current collector used in the cord reel of this invention connects the cylindrical protrusion formed on either the annular electrode holder or the brush holder to the insertion hole formed on the other holder. They are combined by being fitted into the winding drum, and in this combined state they are installed inside the winding drum. One holder is attached to the shaft by fitting the shaft into the cylindrical projection and is fixed to a stationary part within the winding drum. Since the cylindrical protrusion of one holder is fitted into the insertion hole, the other holder is rotatable around the cylindrical protrusion on the same rotation axis as the other holder. There is. Further, one end of the engagement pin fixed to the side plate of the winding drum is loosely fitted into the engagement hole in the outer peripheral portion. For this reason, the other holder is attached to one holder so that it rotates while being combined with the other holder as the rotating part within the winding drum rotates.

In this way, the current collector in the cord reel of this invention is not attached directly to the side plate, but is attached with one end of the engagement pin loosely fitted into the engagement hole of the other holder, and both The holders are installed in combination with each other. Therefore, even if the side plate is slightly deformed or vibrates with rotation, the deformation or vibration of the side plate will not affect the current collector. Therefore, the energization state is not adversely affected by deformation or vibration of the side plate.

In addition, in the current collector device used in this invention,
Because it uses metal brushes, it has lower electrical resistance than graphite brushes and generates very little heat. Therefore, a larger amount of current can be applied than in the past, and it can be used for a long time.

[Embodiment] FIG. 1 is a sectional view showing an embodiment of this invention, and corresponds to FIG. 5 of a conventional back-feeding type cord reel. In FIG. 1, the current collector 2
0 is located around the shaft 7. The annular electrode holder 23 of the current collector 20 is mounted on the shaft 7 and is locked by a locking pin 17. The annular electrode holder 23 has two
Two annular electrodes 21 are attached with grooves provided on the inside and outside, respectively. Cord wires 8a and 8b of a cord 8 inserted into the shaft 7 are connected to the annular electrode 21, respectively. A metal brush holder 24 is provided in combination opposite the annular electrode holder 23, and the metal brush holder 24 has two metal brushes 22 at positions corresponding to the annular electrodes 21. Each is attached with a groove. Cord wires 5a and 5b of the winding cord 5 inserted into the winding drum 2 are connected to the metal brush 22, respectively. Engagement part 3 of metal brush holder 24
1 includes an engaging pin 18 whose one end is fixed to the side plate 3.
has been inserted. Furthermore, in order to explain the current collector 20, FIGS. 2 and 3 are shown.

FIG. 2 shows the annular electrode holder 23 and metal brush holder 24 that constitute the current collector 20.
FIG. 3 is a front view of the superimposed parts viewed from the inside toward the outside. FIG. 3 is a sectional view taken along the - line in FIG. 2. In FIGS. 2 and 3, a cylindrical protrusion 25 is provided at the center of the annular electrode holder 23, and two annular electrodes 21 are arranged concentrically on the outside of the protrusion 25. It is installed with a groove. Holes 27 and 28 for connecting cord wires are bored in the grooves in which the two annular electrodes 21 are attached.

A fitting hole 26 is formed in the center of the metal brush holder 24 and is large enough to fit the protrusion 25 of the annular electrode holder 23 .
Two metal brushes 22 are installed around the insertion hole 26 with respective grooves facing outward. Several protrusions 22a are formed on each of the two metal brushes 22 at appropriate intervals. The convex portion 22a protrudes to a height such that it can come into contact with the annular electrode 21 when the metal brush holder 24 is fitted into the annular electrode holder 23. Holes 29 and 30 for connecting cord wires are bored in the grooves in which the two metal brushes 22 are attached, respectively. Furthermore, a metal brush holder 24
At both ends, holes are formed as engaging portions 31 into which engaging pins having one end fixed to the side plate are inserted.

When combining the current collector, the protrusion 25 of the annular electrode holder 23 is attached to the metal brush holder 2.
4 and fit into the fitting hole 26 of No. 4. With this combination, the convex portion 22a of the metal brush 22 comes into contact with the annular electrode 21, allowing electrical continuity. Furthermore, in order to maintain this contact, a coil spring 15 is used as a biasing means, as shown in FIG.
is provided so as to press the metal brush holder 24 against the annular electrode holder 23. The coil spring 15 is connected to the coil spring receiving portion 32 of the metal brush holder 24 and the groove 3 of the annular electrode holder 23.
4 (shown only in FIG. 1, not shown in FIG. 3).

The material for the annular electrode is not particularly limited as long as it is a metal used as an electrode in general electrical equipment, but brass or the like is recommended from the viewpoint of workability and cost.

The material of the metal brush is not particularly limited as long as it is elastic enough to make good contact with the annular electrode, but phosphor bronze is recommended from the viewpoint of workability and cost. Further, in this embodiment, a continuous ring-shaped metal brush is used, but it may be divided into an appropriate number of parts, as long as it has a convex part that makes effective contact with the ring-shaped electrode. , the shape is not particularly limited.

Referring back to FIG. 1, the operation of this embodiment when the drum rotates during use will be explained. As the winding cord 5 is pulled out, the winding drum 2 and the side plates 3 and 4 rotate, and due to the rotational movement of the engagement pin 18 fixed to the side plate 3, the engagement pin 18 and the engagement portion 31 are rotated. The metal brush holder 24 engaged with rotates. On the other hand, the annular electrode holder 23 has the locking pin 17
Since it is locked to the shaft 7 by , it does not rotate and remains stationary. Therefore, only the metal brush holder 24 rotates, and the convex portion 22a of the metal brush 22 attached to the metal brush holder 24 rotates while contacting the surface of the annular electrode 21. Even during this rotation,
Since the coil spring 15 serving as a biasing means appropriately presses the metal brush holder 24 against the annular electrode holder 23, the metal brush 22 and the annular electrode 21 maintain a good contact state. Due to this good contact state, the current supplied from the cord 8 passes through the annular electrode 21 and the metal brush 22 and is supplied to the wound cord 5.

In this embodiment, the annular electrode and metal brush are mounted and supported in combination. Further, the hole serving as the engagement portion of the metal brush is considerably larger than the engagement pin fixed to the side plate, and is loosely engaged with the engagement pin. Therefore, in the current collector of this embodiment, since there is no part directly attached to the side plate, even if the side plate is slightly deformed or vibrates with rotation, the side plate will not be deformed. The energization state of the current collector will not be adversely affected by vibrations.

Further, since the current collector of this embodiment uses metal electrodes for the annular electrode and the metal brush, the electric resistance is lower than that in the case of conventional graphite, and the heat generation is extremely small. Furthermore, since it can be manufactured without using expensive materials such as graphite, it can be manufactured at low cost. In the current collector of this embodiment, the annular electrode and the metal brush can be combined and attached in one piece, so that it can be easily attached to the cord reel body, and the manufacturing process can be simplified.

Further, in this embodiment, a current collector device equipped with a coil spring as a biasing means is used to press the brush holder against the annular electrode holder.
This invention is not necessarily limited to the use of a current collector having a biasing means, but may also use a current collector that is brought into contact with the electrode only by the elasticity of a metal brush.

Although this invention can be effectively used for a back-feed type cord reel equipped with a current collector, it is not limited to only a back-feed type cord reel.
It can also be fully utilized for other general types of cord reels. Therefore, a plug may be attached to the end of the cord wound around the drum, and an outlet may be attached to the cord inside the shaft.

[Effects of the invention] The current collector in the cord reel of this invention is not directly attached to the side plate, but is attached to both holders with one end of the engagement pin loosely fitted into the engagement hole of the other holder. are installed in combination with each other. Therefore, even if the side plate is slightly deformed or vibrates with rotation, the deformation or vibration of the side plate will not be directly transmitted to the current collector. Therefore, the energization state is not adversely affected by deformation or vibration of the side plate.

Furthermore, since graphite is not used in this invention, the electrical resistance when energized is low, and the amount of heat generated is extremely small. Therefore, a larger amount of current can be passed than in the past, and it can be used for a long time.

Furthermore, this invention does not require expensive materials such as graphite, so it can be manufactured at low cost. Furthermore, since the current collectors used in this invention can be combined and installed in an integrated manner, the manufacturing process can be made simpler than in the past.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of this invention. FIG. 2 is an exploded front view of the current collector shown in FIG. 1. FIG. 3 is a sectional view taken along the - line in FIG. 2. FIG. 4 is a perspective view of a conventional reverse feeding type cord reel. FIG. 5 is an enlarged sectional view taken along the - line in FIG. 4.
FIG. 6 is a front view of the conventional current collector shown in FIG. In the figure, 2 is a winding drum, 6 is a support leg, 7 is a shaft, 15 is a coil spring, 20 is a current collector, 2
1 is a ring-shaped electrode, 22 is a metal brush, 23 is a ring-shaped electrode holder, 24 is a metal brush holder, 32 is a coil spring receiving part, and 33 is a coil spring holding part.

Claims (1)

[Claims for Utility Model Registration] Current is conducted between a winding drum around which a cord is wound, a support leg having a shaft that rotatably supports the winding drum, and a rotating part and a stationary part in the winding drum. In a cord reel with a current collector, the current collector includes: a metal annular electrode; an annular electrode holder that holds the annular electrode; and a convex portion on a surface of the annular electrode. A metal brush made of a metal having elasticity is provided so as to be in contact with the brush holder, and a brush holder holds the metal brush. , a cylindrical protrusion extending substantially perpendicularly to the holding surface of the holder is formed, a fitting hole large enough to fit the cylindrical protrusion is formed in the center of the other holder, and An engagement hole is formed in the part for loosely fitting one end of an engagement pin fixed to the side plate of the winding drum, and the annular electrode holder and the brush holder fit into the fitting hole. The current collector is assembled by fitting the cylindrical protrusion into the cylindrical protrusion, and in this assembled state, the current collector is attached to the shaft by fitting the shaft into the cylindrical protrusion of one of the holders, and the current collector is attached to the shaft within the winding drum. By fixing it to a stationary part and fitting one end of the engagement pin of the side plate of the winding drum into the engagement hole of the other holder, the annular electrode holder and the brush can be fixed together with the rotation of the rotating part in the winding drum. 1. A cord reel with a current collector, characterized in that one of the thread holders is mounted in a winding drum so that the other rotates.