JPH0453731B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite conductor for a large-capacity trolley, which is used for collecting current to mobile equipment that has a large diameter and requires a large current.

[Problems to be solved by conventional technology/invention]

This kind of conductor for trolleys that has been commonly used in the past was made of a single copper conductor made of extruded copper material as shown in Figure 4, but the larger the capacity, the worse the heat dissipation becomes. As the allowable current density decreases, the cross-sectional area of the conductor must be made larger than necessary, and the weight also increases, worsening transport and installation workability, and further increases the cost due to the increased number of work steps. was. Note that i is an insulating cover.

On the other hand, as an alternative to the copper conductor mentioned above, the conductor body is made of extruded aluminum, which is known as a light metal material, and the sliding surface of the collector is replaced with stainless steel, which is known as a wear-resistant metal material. A so-called aluminum-stainless steel composite conductor has been proposed.

FIG. 5 shows an example of the structure of a conventionally proposed composite conductor for large-capacity trolleys, in which a stainless steel band member SUS is bent and coated on the side surface of the conductor body Al, which is an extruded aluminum material.
A roughly V-shaped concave part is formed on the side surface of the conductor body Al, and the stainless steel band member SUS is
It was attached by being bent to have a substantially W-shaped cross section so as to wrap around the recessed portion and the side surfaces on both sides thereof, and the recessed V-shaped surface in the middle was used as a sliding surface.

The purpose of forming the sliding surface in a so-called V-shape as described above is to obtain so-called centering in which the current collector brush always slides on the center of the sliding surface, that is, the bottom of the recess.

However, if a band member that is harder than the band member is simply wrapped around the conductor body as described above, the spring back caused by bending the band member will always work to separate it from the conductor body. Reliability in bonding with the band member, particularly in electrical continuity, tends to decrease, and since the sliding surface is approximately V-shaped, the current collector brush has the drawback of being prone to uneven wear.

In view of the problems of the prior art described above, the present invention has been made to
This type of large-scale construction allows for secure attachment of the band member made of wear-resistant metal to the conductor body made of highly conductive metal by bending it, contributing to improved electrical reliability, and providing stable current collection. It is an object to provide a composite conductor for a capacitive trolley.

[Means to solve the problem]

The composite conductor for a large-capacity trolley provided by the present invention is characterized in that the conductor body has a pair of protrusions on the side opposite to the head, and a recess is formed between the pair of protrusions; is bent into a substantially inverted U-shape in cross section, has a base in the center that receives the contact pressure of the current collector, has leg-like parts on both sides, and further bulges inward at the middle of the pair of leg-like parts. The band member has an arcuate portion formed as shown in FIG. The conductor body is fitted along the inner surface of the protrusion, and the intermediate portion of the pair of leg-like portions of the conductor body is crimped from the outer surface so that the middle portion of the conductor body is fitted along the outer side of the arc-shaped portion of the pair of leg-like portions of the band member. It is characterized in that it is integrally press-fitted into the small recessed part, and that the end edges of the leg-like parts further extending from the press-fitted integral part are left open.

〔Example〕

FIG. 1 shows an embodiment of a large-capacity trolley using a composite conductor according to the present invention.

The conductor main body designated by reference numeral 1 has a head 11 with a polygonal cross section and a pair of protrusions 13, 13 that are bifurcated on the opposite side of the head 11 with a thin and long body 12 in between. It has a recess 131.

On the other hand, the cross section of the band member 2 has an approximately inverted U shape.
A base portion 21 is bent in the shape of a square and has a flat surface in the center, and leg portions 22, 22 on both sides.
The leg portions 22, 22 have arcuate portions 221, 221 formed to bulge inward in the middle.

The band member 2 shaped as described above has the base 21 on the inner bottom surface of the recess 131 of the conductor main body 1, and the leg-shaped parts 22, 22 on both sides are connected to the pair of protrusions 13, 13. The pair of protrusions 13, 13 are fitted along the inner surface of the
The middle part of the arc-shaped parts 221, 221 in the leg-like parts 22, 22 on both sides are tightened from the outer surface.
It is press-fitted and integrated into a small outer recess of the press-fitted integral part, and the end edge of the leg-like part further extending from the press-fitted integrated part is left open.

As mentioned above, since the abrasion-resistant, that is, hard, band member is fitted into the recess of the conductor body including the bent portion, the elastic return or spring back of the leg portions 22, 22 caused by the bending of the band member is caused by the bending. is always generated outward, and by tightening the intermediate portions of the projections 13, 13 of the conductor main body from the direction opposite to the direction in which the elastic return occurs, the projections 13, 13 Since the spring action of the leg parts 22, 22, which can elastically return outwards while the extended edge of the part itself is kept open, is press-fitted into the outer small recess of the leg part. , dissimilar metal contact between the conductor main body 1 and the band member 2 can be achieved with sufficient elastic pressure contact, and electrical continuity can be made stable over a long period of time.

In particular, as mentioned above, the bonding area between the outer small recess of the arcuate portion of both legs of the band member and the intermediate portion of the protrusion of the conductor body that is press-fitted into the concave portion is equal to that of a bond made by a substantially flat surface. It is possible to achieve sufficiently stable electrical conduction with respect to large-capacity current supply.

Furthermore, a band member 2 that becomes a sliding member of the current collector brush
However, a pair of leg-shaped parts 22, 22 spaced apart from each other
The flat inner bottom surface of the base 21 facing through can be a substantial sliding surface, and the inner surfaces of the leg-shaped parts 22, 22 facing each other so as to limit the horizontal vibration of the current collector brush. Since the current collector brush is composed of a protruding arc-shaped portion, localized uneven wear of the current collector brush can be made difficult to occur.

In the figure, 3 is an insulating cover which extends from the head 11 of the conductor main body 1 to the body member 12 and the pair of protrusions 13, 13 that extend from the outer surface of the body member 12 and the pair of protrusions 13, 13. A restricted opening 31 is formed. The current collector brush is in the opening 3
1 is pressed against a predetermined portion of the band member 2 to cause sliding movement.

FIGS. 2 and 3 show other embodiments of the composite conductor for large-capacity trolleys according to the present invention,
The example shown in FIG. 2 differs from the previously described embodiment in that the head 11' of the conductor body 1 is finished in an arcuate shape. Since the other parts are substantially the same as those of the embodiment described above, the same reference numerals as in FIG. 1 are given.

The example shown in FIG. 3 differs from the above two embodiments in that the base 21' of the band member 2 is arcuate.
Since the other parts are substantially the same as those of the embodiment described above, the same reference numerals as in FIG. 1 are given. Even when the main sliding surface of the current collector brush is an arc as described above, it provides smooth sliding in the same manner as the flat sliding surface as in the embodiment described above, and uneven wear is less likely to occur.

[Action/effect of the invention]

As explained above, according to the composite conductor for large-capacity trolleys of the present invention, the sliding surface of the current collector brush consists of three surfaces surrounded by the inner upper surface and left and right side surfaces of the inverted U shape. Not only can the horizontal vibration of the electric brush be restricted by the left and right side surfaces to prevent it from coming off, but also the following functions and effects can be achieved.

(1) Since the abrasive or hard band member is fitted into the recess of the conductor body including the bent portion, the elastic return of the leg-shaped portion due to self-bending, or spring back, always occurs outward. By tightening the intermediate portion of the protrusion of the conductor body from the direction opposite to the direction in which the elastic return occurs, the protrusion can maintain the extended edge of the leg-like part of the band member free. Since it is press-fitted into the outer small recess of the leg while receiving the spring action of the leg, which can cause elastic return to the outside, the contact between the conductor body and the band member can be made with sufficient elasticity. This can be accomplished by pressure welding, and electrical continuity can be made stable over a long period of time.

(2) The flat inner bottom surface of the base of the band member, which is the sliding member of the current collecting brush, which is faced between a pair of leg-shaped parts spaced apart from each other, is used as a substantial sliding surface. In addition, since the inner surfaces of the opposing leg portions are made up of protrusions of arcuate portions so as to limit the horizontal vibration of the current collector brush, localized uneven wear of the current collector brush is less likely to occur. can.

(3) Since the intermediate portion of the protruding portion of the conductor body is tightened into the small recess on the outside of the arc-shaped portion of the leg portion of the band member, the current collector brush is used to tighten the dissimilar metal joint portion. Sufficiently stable electrical continuity can be achieved without any risk of adverse effects.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing one embodiment of the composite conductor for large-capacity trolleys according to the present invention, and FIGS. 2 and 3 show other embodiments of the composite conductor for large-capacity trolleys according to the present invention. 4 and 5 are cross-sectional explanatory views showing a conventional trolley of this type. 1 in the code is the conductor body, 11,1
1' is the head, 12 is the body, 13 is the protrusion, 131
2 is a concave portion, 2 is a band member, 21, 21' is a base, 22
221 is a leg-shaped portion, and 221 is an arc-shaped portion.

Claims (1)

[Claims] 1. A conductor body comprising a highly conductive conductor body and a wear-resistant band member, wherein the conductor body has a pair of protrusions on a side opposite to the head, and the pair of protrusions A concave portion is formed between the protrusions of the strip, and one of the strip members is bent to have an approximately inverted U-shape in cross section, and has a base portion in the center that receives the contact pressure of the current collector, and leg-like portions on both sides. Furthermore, the band member has an arcuate portion formed to bulge inward between the pair of leg-like portions, so that the base of the band member is located in the recessed portion of the conductor main body. The leg-like portions on both sides of the band member are fitted into the inner bottom surface and along the inner surfaces of the pair of protrusions, and the intermediate portions of the pair of protrusions of the conductor body are crimped from the outer surface to tighten the band member. A large-capacity trolley, characterized in that the pair of legs are integrally press-fitted into the outer small recesses of the arcuate portions, and the edges of the legs further extending from the press-fitted integral portions are left open. Composite conductor.