JPH0373497B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a trolley conductor using a metal strip that can be formed by roll forming.

[Conventional technology]

Conventional trolley conductors are made by using metal strips and bending them by roll forming.
In order to reduce costs, it has been proposed to use a steel plate for the main body, to which a highly conductive strip such as a copper plate is attached, and to form the contact surface of the current collector with the strip.
(For example, Utility Model Publication No. 53-7400, JP-A-59-
See Publication No. 164233. ) In these conductors, the main body strip material and the collector contact strip material are each bent into a predetermined shape, and both side edges extending beyond the overlap of the main body strip materials are made to protrude outward from each other. A current collector contacting band material is crimped so as to surround both of these protruding side edges so as to be integrally connected.

[Problem that the invention seeks to solve]

In the trolley conductor having the above structure, the joint between the main body band and the current collector contact band is close to the current collector contact area, and vibrations caused by repeated sliding of the brush, which is the current collector, are directly applied. , which tended to weaken the electrical and mechanical bond between the two strips.

Problems that arise due to the bonding structure of such composite strips are large, for example, since the electrical connection between the main body strip and the current collector contact strip corresponds to a predetermined electrical capacity, the bonding of both strips is difficult. Weakening of the conductor could cause heating of the conductor due to poor contact, etc., or deformation of the current collector contact surface. In addition, since the main body band material and the current collector band material are different metal materials, if the bond weakens, the bonding surfaces of both band materials will shift due to the difference in elongation due to heat and the difference in bending rigidity. In addition, the conductor was distorted in the longitudinal direction like a undulation, which could significantly reduce the product value as a trolley conductor.

Furthermore, since the two strips are caulked together near the current collector contact surface formation section, the deformation strain caused by the caulking acts directly on the current collector contact surface section, making it difficult to form a uniform surface shape in the length direction of the conductor. Irregular unevenness was often generated, making it impossible to hope for an improvement in current collection characteristics.

Conventionally, in order to solve these problems, measures have been taken to increase the bonding strength by adding unevenness to the bonding surfaces of both strips, intervening solder plating, etc. This has made manufacturing even more difficult and even worse, and even if these measures were taken, it would still be impossible to fundamentally solve the above-mentioned problems.

The present invention has been made in view of these problems in the prior art, and aims to provide a trolley conductor of this type that has stable electrical and mechanical properties, is easy to manufacture, and contributes to low cost. It is something to do.

[Means for solving problems]

The trolley conductor of the present invention, which achieves the above-mentioned objects, uses a metal strip material and continuously folds and bends it in the length direction between both longitudinal edges of the material to form an overlapping plate portion. , a plurality of folded bent parts are formed in the folded part on one side with respect to the plate part, and a band between the folded bent parts forms a current collecting contact surface, and the folded part on the other side with respect to the plate part A plurality of folded bends corresponding to the plurality of folded bends are formed on one side edge, and a side edge further extending through the folded bends is formed on the other side edge. It is made by abutting and engaging.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below with reference to the drawings.

FIG. 1 shows a typical structural example of the trolley conductor of the present invention.

The trolley conductor 1 in this example is formed by a single metal strip 2 made of copper or its alloy, and is slightly wider than 1/2 the width between both edges along the length of the strip 2. A two-piece plate (web) 3 is formed by continuously folding back and bending in the length direction at the shifted axis line portion, and at the folded portion serving as one longitudinal side edge of this plate portion 3,
By forming the two folded bent portions 4, 4 slightly inclined and protruding, two flanges 5, 5 are formed by joining two pieces together, and the band portion 6 extending between the folded bent portions 4, 4 is inwardly formed. It is concavely curved in a substantially V-shape, and this concave curved surface 7 serves as a contact surface for the current collector.

At both side edge portions of the strip material 2, which are the other longitudinal side edges of the plate portion 3, one of the side edge portions, which is largely elongated, is bent so as to correspond to the folded bend of the current collector contact surface forming portion. Two hollow flanges 9, 9 are formed by forming the two folded bent portions 8, 8 to extend substantially at right angles to the plate portion 3, and the second or last folded bent portion 8 from the plate portion 3 is formed as follows. The other side edge portion 10 is bent at a substantially right angle and overhangs.
The side edge end 11, which extends further through the folded bent portion 8, is engaged with the other side edge portion 10 so as to circumscribe the other side edge portion 10.

The trolley conductor 1 thus constructed can be continuously formed and produced using a roll-forming machine, and can be manufactured not only as a short unit conductor but also as a strip of arbitrary length using a long strip. It can also be provided as a specific trolley conductor.

In such a trolley conductor 1, its cross-sectional shape is a substantially symmetrical shape, and the plate portion 3
The flanges 5, 5, 9, and 9 on both side edges thereof each form two plate parts, and the side edges, which are most easily deformed by bending stress, are reinforced as triple layers. , the bending rigidity of each part is approximately equal.

Also, one folded bent portion 8 is connected to the other side edge 1.
Since it is inscribed so as to wrap around 0, the side edge end 11 that has passed through the folded bent part 8 is the side edge part 1.
Therefore, even if the trolley conductor is wound into a spiral with the plate portion 3 parallel to the winding axis, there will be no deformation such as opening between both side edges.

As shown in FIG. 2, such a trolley conductor 1 is constructed by covering an insulating cover 12 by extruding a synthetic resin so as to leave a contact surface 7 concave in a substantially V-shape and insulating it. can do.

Opening 1 in insulating cover 12 exposing contact surface 7
3 is preferably set by a pair of leg-shaped parts 14, 14 extending while circumscribing the two folded bent parts 4, 4.

A current collector (not shown) has a pair of leg-shaped parts 14, 14.
In this case, even if the current collector tries to deviate in the width direction of the conductor,
Since the contact surface 7 undergoes a so-called centering action of returning to the bottom, which is the center of the concave curved surface, there is no fear that the current collector will wear out the leg portion 14 by rubbing it.

Such an action is effective when the contact surface 7 is laid sideways and the current collector is likely to move downward under its own weight.

The trolley conductor 1 can also be constructed using a plurality of different metal strips instead of a single metal strip as in the above embodiment.

FIG. 3 shows an example of a trolley conductor formed from two metal strips 23, 33.

This uses a metal strip 23 made of copper or its alloy, and a metal strip 33 made of iron or its alloy (stainless steel, etc.). The surfaces are laminated, and the metal strip 23, preferably made of copper or an alloy thereof, is bent and folded into the same shape as in the embodiment described above so that the metal strip 23 becomes the outer surface.

The same or equivalent parts as in Fig. 1 are indicated by the same reference numerals.
Descriptions of each part will be omitted.

In this way, by combining not only copper materials but also dissimilar metals with low conductivity and easily available metal materials, it is more economical and has various current carrying capacities than when made of copper alone. A suitable trolley conductor can be provided.

As can be seen from these examples, the trolley conductor of the present invention is not limited to a single strip material, but even when it is composed of a plurality of dissimilar metal strip materials, a highly conductive portion is provided on the entire outer surface of the trolley conductor. Therefore, a power supply connection with good electrical contact can be achieved by clamping the plate part 3 by attaching a clamp to the flanges 9, 9, which serve as reinforcing parts, excluding the current collector contact surface 7. The same thing can also be achieved in the case of an intermediate connection using a joint fitting between the terminals of trolley conductors whose lengths are specified.

FIG. 4 shows a further modified example of the trolley conductor of the present invention, and the difference from the above-mentioned embodiment shown in FIG. At both side edge portions, one of the widely extending side edges is formed with two folded bent portions 8', 8' projecting out in the same manner as on the side where the current collector contact surface 7 is formed, thereby forming two two-piece flanges 9', 9. ', and a side edge 11' extending further through the folded bent portions 8', 8' is brought into abutting engagement with the other side edge 10' which is not bent at all.

Components that are the same as those in FIG. 1 are designated by the same reference numerals, and explanations of these components will be omitted.

In this case, the portion where both side edges gather also forms a double plate portion like the other portions.

If there is a concern that separation may occur at that part, the abutting parts of the edges on both sides should be integrated by intervening solder plating and melting the solder plating, or by welding or by machining irregularities. It is also possible to add means such as applying a method to interlock the parts.

The trolley conductor of the present invention can be made into various forms by further modifying the structure of the above-described embodiment while maintaining its basic form.

For example, in the current collector contact surface 7 forming portion, two folded bent portions 4, 4 are formed to protrude approximately at right angles to the plate portion 3 to form a flange, and a band portion between the two folded bent portions 4, 4 is formed. The flat current collector contact surface 7 can be formed by using a slate.

Further, as for the concave current collector contact surface 7, instead of forming it into a substantially V-shape as in the previous example, it is also possible to form it by concave processing into a bowl shape.

〔Effect of the invention〕

As explained above, according to the trolley conductor of the present invention, the current collecting contact surface is formed by the band portion between the plurality of folded bends on the folded side of the metal strip, so that the main body is made of a composite strip as in the past. It is possible to provide a stable current collecting surface that maintains its shape without twisting or other deformation due to their bonding, which occurs when a contact member is configured, and it is possible to dramatically improve current collecting characteristics. It is something.

In addition, since the joint is not formed in the vicinity of the current collector contact part, but is joined at the part farthest from the contact part, the joining can be made simple, and it can be bent into a single strip material. Since it can be manufactured according to a specific procedure, it is extremely easy to manufacture.

Furthermore, by folding and bending one strip, a joint is formed by abutting engagement of both side edges extending to the same side of the overlapping plate parts, and a current collector contact part is formed on the opposite side. Therefore, even if the current collector is a sliding object such as a brush, the effects of vibrations caused by it are small, and unlike the conventional joining of composite metal parts, there is no possibility of relative displacement due to heat. There is no need to worry, and a stable combination of opportunities can be achieved.

As described above, it is easy to manufacture, is electrically and mechanically stable, and has a dramatic improvement in current collection characteristics, so its practical effects are truly great.

[Brief explanation of drawings]

FIG. 1 is a perspective explanatory view showing a preferred structural example of the trolley conductor of the present invention, FIG. 2 is a cross-sectional view showing an example of an insulated trolley using the same trolley conductor, and FIGS. 3 and 4 are FIG. 7 is a cross-sectional explanatory diagram showing a modification of the trolley conductor of the present invention. DESCRIPTION OF SYMBOLS 1... Trolley conductor, 2, 23, 33... Metal strip material, 3... Plate part, 4... Folded bent part, 6... Band part, 7... Current collector contact surface, 8, 8'... Folded bent part, 10, 10 '...Side edge portion, 11,11'...Side edge end.

Claims (1)

[Claims] 1. A metal strip is used and continuously folded back and bent in the length direction between both longitudinal edges of the metal strip to form an overlapping plate portion, and The folded part on one side has a plurality of folded bent parts projecting out, and the band between these folded bent parts forms a current collector contact surface, and the side edge on the other side with respect to the plate part A plurality of folded bent portions corresponding to the plurality of folded bent portions are formed projectingly on one side edge portion, and a side edge end further extending through the folded bent portions is abutted and engaged with the other side edge end. A trolley conductor characterized by: 2 Claim 1 using a single metal band material
Trolley conductor as described in section. 3. The trolley conductor according to claim 1, which uses two layers of metal strips made of different materials. 4. The trolley conductor according to claim 1, which has an abbreviated cross section.