Terminal fitting

Abstract

To provide a terminal fitting which enables work to be performed without fail easily in a short time without causing noise from a compressor etc. and depending on skills of a worker.SOLUTION: A terminal fitting 1 according to the invention includes a body member 100 and a cotter member 200 configured to engage with the body member 100. A hard aluminum strand wire 10 is fixed between the body member 100 and the cotter member 200 without using bolts. The cotter member 200 is provided with a connection through hole 250. The body member 100 and the cotter member 200 are formed of aluminum alloy.SELECTED DRAWING: Figure 11

Description

[Technical field]

[0001] The present invention relates to a fastener that fastens a hard aluminum stranded wire in a boltless manner and fastens the hard aluminum stranded wire. [Background technology]

[0002] As a dead-end fitting used when fastening one end of a feeder cable to a pole or the like, conventionally, a dead-end fitting that fastens the feeder cable by the tightening force of multiple bolts, or a dead-end fitting that grips the cable with a sleeve and fastens the cable by compressing the sleeve, has been used (see Non-Patent Document 1). [Non-Patent Document 1] https: / / www.tekki.co.jp / products / list / train / product_train07 / Summary of the Invention [Problem to be solved by the invention]

[0003] The former type of fastening, which relies on the fastening force of the bolt, has the problem that it takes time to tighten the bolt evenly.

[0004] On the other hand, the latter fastener using compression has problems such as the effort required to operate the compressor at high altitudes, the noise from the compressor, and the skill required to operate the compressor.

[0005] Regardless of which of the above dead-end fasteners was used, if the worker had low technical skills, there was a risk that the feeder wire would be pulled out of the dead-end fastener when tension was applied to the feeder wire after it was secured with the dead-end fastener.

[0006] In addition, until now, there have been boltless dead-end fittings that secure power feeders without relying on the fastening force of a bolt or the compressive force applied to a sleeve as described above. However, such dead-end fittings use copper alloys and could not be applied to power feeders made of hard aluminum stranded wires whose main components are dissimilar metals. [Means for solving the problem]

[0007] In order to solve the above problems, the present invention provides a fastener comprising a main body member and a cotter member that engages with the main body member, wherein a hard aluminum strand is fixed in a boltless manner between the main body member and the cotter member, and a connecting through hole is provided in the cotter member, The main body member and the cotter member are made of an aluminum alloy.

[0008] The fastener according to the present invention is characterized in that the aluminum alloy is AC4C or AC4CH as specified in JISH5202.

[0009] The fastening fitting according to the present invention is characterized in that the connecting through hole is provided in the bifurcated structure.

[0010] In addition, the fastening fitting according to the present invention is characterized in that the cotter member is provided with a thin-walled portion.

[0011] Furthermore, the end fastener according to the present invention is characterized in that, when the hard aluminum strand is fixed between the main body member and the cotter member, the angle θ formed by a line segment OP and the central axis of the hard aluminum strand is 5° or more and 11° or less, where P is the point where the central axis of the hard aluminum strand intersects with the start-side opening of the main body member, and O is the point where the hole center of the connecting through hole intersects with a plane that includes the central axis of the hard aluminum strand and is perpendicular to the hole center.

[0012] The fastening fitting according to the present invention is characterized in that the distance d between a vertical plane relative to the central axis of the hard aluminum strand, which includes the end of the concave surface of the cotter member that holds the hard aluminum strand, and a vertical plane parallel to the vertical plane, which includes the center of the connecting through hole, is 100 mm or more and 150 mm or less. Effect of the Invention

[0013] The fastener of the present invention has a main body member and a cotter member made of an aluminum alloy. With such a fastener of the present invention, the installation of the hard aluminum stranded wire can be performed easily and reliably in a short time without generating noise from a compressor or the like and regardless of the skill of the worker. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a fastener 1 according to an embodiment of the present invention. [Diagram 2] 1 is a perspective view of a main body member 100 of a fastener 1 according to an embodiment of the present invention. [Diagram 3] 1A is a top view of a main body member 100, and FIG. [Figure 4] FIG. 4 is a cross-sectional view taken along the line XX' in FIG. [Diagram 5] 1 is a perspective view of a cotter member 200 of a fastener 1 according to an embodiment of the present invention. [Figure 6] 1A is a top view and FIG. 1B is a side view of a cotter member 200. [Figure 7] 1A to 1C are diagrams showing a procedure for fixing a hard aluminum stranded wire 10 by a dead-end fitting 1 according to an embodiment of the present invention. [Figure 8] 1 is a diagram showing a state in which a hard aluminum stranded wire 10 is fixed by a dead-end fitting 1 according to an embodiment of the present invention. [Figure 9] FIG. 2 is a diagram illustrating a suitable layout for the end fastener 1 according to the embodiment of the present invention. [Figure 10] FIG. 2 is a diagram illustrating a preferred dimensional relationship for a fastener 1 according to an embodiment of the present invention. [Figure 11] 1A to 1C are diagrams showing an example of installation using a fastener 1 according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the present invention will be described with reference to the embodiments and drawings. Fig. 1 is a perspective view of a dead-end fitting 1 according to an embodiment of the present invention. The dead-end fitting 1 according to the present invention is intended to fasten and hold a hard aluminum stranded wire, and the wire material handled by the dead-end fitting 1 according to the present invention is not intended to be a hard copper stranded wire. Note that, in this embodiment, the description will be given based on the case where a hard aluminum stranded wire is used as a feeder wire, but the dead-end fitting 1 according to the present invention can be applied to any application in which the hard aluminum stranded wire is used.

[0016] The fastener 1 according to the present invention is composed of a main body member 100 and a cotter member 200 having a wedge-shaped portion that engages with the main body member 100. Because the fastener 1 according to the present invention is intended to fasten a hard aluminum stranded wire, both the main body member 100 and the cotter member 200 are made of an aluminum alloy, which is the same metal as the stranded wire. Through prototyping and the like, it has been found that the aluminum alloy used for the main body member 100 and the cotter member 200 is preferably AC4C or AC4CH as specified in JISH5202.

[0017] Here, the directions and the like mentioned in this specification are defined. The direction in which the hard aluminum stranded wire 10 (not shown in FIG. 1) fixed by the fastener 1 extends is defined as the "longitudinal direction." In addition, the side of the cotter member 200 engaged with the main body member 100 on which the connecting through hole 250 is provided is defined as the "terminal side," and the side on which the connecting through hole 250 is not provided is defined as the "starting side."

[0018] Next, the main body member 100 constituting the fastening fitting 1 will be described. Fig. 2 is a perspective view of the main body member 100 in the fastening fitting 1 according to the embodiment of the present invention. Fig. 3 shows (A) a top view and (B) a side view of the main body member 100. Fig. 4 is a cross-sectional view taken along the line X-X' in Fig. 3(A). In Fig. 3, the terms top view and side view are used, but when the fastening fitting 1 is actually used, the main body member 100 is not used with Fig. 3(A) facing upward.

[0019] The main body member 100 has, on its outer periphery, a start-end rib 113 provided near the start-end, a finish-end rib 117 provided near the finish-end, and two intermediate ribs 115 provided between them. The strength of the main body member 100 is ensured by the provision of these ribs.

[0020] In addition, the main body member 100 has a start side opening 123 and a end side opening 127 at both ends, which are perpendicular to the longitudinal direction, and through which the hard aluminum stranded wire 10 (not shown in Figures 2 to 4) and the cotter member 200 (not shown in Figures 2 to 4) are inserted.

[0021] 2, a wire insertion portion 130 and a cotter member insertion portion 140 are provided on the inner peripheral side of the main body member 100, from top to bottom. The wire insertion portion 130 is a space through which the hard aluminum stranded wire 10 is inserted, and the wire insertion portion 130 is provided with a main body-side wire holding concave surface 132 that contacts and holds the hard aluminum stranded wire 10.

[0022] The cotter member insertion portion 140 is a space through which the cotter member 200 is inserted, and is provided with two inclined step portions 150 that engage with the cotter portions 220 provided at two locations on both sides of the cotter member 200. The inclined step portion 150 has an inclined surface that slopes continuously from an inclined step start end 153 to an inclined step end 157. As shown in FIG. 4, the inclined step portion 150 has a thickness of the inclined step end 157 (the length in the vertical direction as viewed in FIG. 4) that is thicker than the thickness of the inclined step start end 153.

[0023] Next, a description will be given of the cotter member 200 constituting the fastening fitting 1. Fig. 5 is a perspective view of the cotter member 200 in the fastening fitting 1 according to the embodiment of the present invention. Fig. 6 shows (A) a top view and (B) a side view of the cotter member 200.

[0024] The cotter member 200 has a filament holding base 210 and an arm 230 extending from the filament holding base 210. The filament holding base 210 is provided with a cotter-side filament holding concave surface 212 that contacts the hard aluminum stranded wire 10 (not shown in Figs. 5 and 6) and clamps and fixes it between the main body-side filament holding concave surface 132 of the main body member 100. The cotter-side filament holding concave surface 212 has a cotter-side filament holding concave surface start end 213 and a cotter-side filament holding concave surface end 217 at both ends, and it is particularly preferable that the positional relationship between the cotter-side filament holding concave surface end end 217 and the connection through-hole 250 (more specifically, the hole center 251) is specified. Details will be described later.

[0025] The filament retaining base 210 of the cotter member 200 has wedge-shaped cotter portions 220 provided at two locations on either side of the cotter-side filament retaining concave surface 212. The cotter portion 220 has an inclined surface that slopes continuously from the cotter portion start end 223 to the cotter portion end 227, and the inclined surface is adapted to engage with the inclined step portion 150. As shown in FIG. 6(B), the thickness of the cotter portion start end 223 of the cotter portion 220 (the length in the vertical direction as viewed in FIG. 6(B)) is made thicker than the thickness of the cotter portion end 227.

[0026] The filament holding base 210 of the cotter member 200 is provided with a mark 228. In this embodiment, the mark 228 is an arrow-shaped mark, but the mark of the mark 228 may be any mark. When the hard aluminum stranded wire 10 is fixed by the dead-end fitting 1, the cotter member 200 is pushed into the main body member 100 until the tip of the arrow-shaped mark of the mark 228 reaches the main body member 100. This allows the worker to reliably fix the hard aluminum stranded wire 10 by the dead-end fitting 1. In this embodiment, the mark 228 is provided on the side of the filament holding base 210, but the mark 228 may be provided at any position on the cotter member 200 as long as the relative positional relationship between the main body member 100 and the cotter member 200 can be grasped.

[0027] 6(B), arm portion 230 extends downward from wire holding base 210. Arm portion 230 has thin portion 236 that is thinner than other portions of arm portion 230, thereby reducing the weight of fastener 1 as a whole.

[0028] At the end of the arm portion 230, a connecting through hole 250 is provided, which is used when connecting the dead-end fitting 1 to which the hard aluminum stranded wire 10 is fixed to an insulator or the like (not shown in Figs. 5 and 6). The end of the arm portion 230 is a bifurcated structure 240 (see Fig. 6(A)), and the connecting through hole 250 is provided so as to penetrate both sides of the bifurcated structure 240. When the connecting through hole 250 is viewed as a circle in Fig. 6(B), its center is defined as a hole core 251 (see also Fig. 6(A)).

[0029] 7 is a diagram showing a procedure for fixing a hard aluminum stranded wire 10 with a dead-end fitting 1 according to an embodiment of the present invention. When fixing a hard aluminum stranded wire 10 with a dead-end fitting 1, first, the hard aluminum stranded wire 10 is inserted into the main body-side wire retaining concave surface 132 of the main body member 100. Next, while inserting the terminal end of the cotter member 200 from the starting end opening 123 of the main body member 100 holding the hard aluminum stranded wire 10, the cotter member 200 is pushed into the main body member 100 until the tip of the arrow-shaped mark of the identifying portion 228 approaches the main body member 100.

[0030] The above-mentioned procedure completes the fastening of the hard aluminum stranded wire 10 by the dead-end fitting 1. Fig. 8 is a diagram showing the state in which the hard aluminum stranded wire 10 is fastened by the dead-end fitting 1 according to the embodiment of the present invention.

[0031] Next, a description will be given of a layout that prevents a load outside the allowable range from being applied to the hard aluminum stranded wire 10 when the hard aluminum stranded wire 10 is fixed by the dead-end fitting 1 and then the dead-end fitting 1 is connected to another structure such as an insulator through the connection through-hole 250. Fig. 9 is a diagram illustrating a layout suitable for the dead-end fitting 1 according to an embodiment of the present invention.

[0032] 9 shows the posture of the fastening fitting 1 when the fastening fitting 1 for fixing the hard aluminum stranded wire 10 is connected to another structure such as an insulator by the connecting through hole 250. In FIG. 9, the dashed dotted line indicates the outer periphery of the hard aluminum stranded wire 10, and the dashed two dotted line indicates the central axis of the hard aluminum stranded wire 10.

[0033] The point where the central axis (two-dot chain line) of the hard aluminum stranded wire 10 and the starting end opening 123 of the main body member 100 intersect is designated as P. The tension from the hard aluminum stranded wire 10 to the entire fastening fitting 1 can be considered to be applied to this point P.

[0034] The point where the hole center 251 of the connection through-hole 250 intersects with a plane (the plane of the paper in FIG. 9) perpendicular to the hole center 251 and including the central axis (two-dot chain line) of the hard aluminum stranded wire 10 is designated as O. The fastening fixture 1 rotates about this point O. A line segment OP is in the same direction as the tension applied to the hard aluminum stranded wire 10, and the fastening fixture 1 as a whole is tilted at an angle θ as shown in FIG.

[0035] The hard aluminum stranded wire 10 also bends at the above-mentioned angle θ at point P. In order to reduce the load on the hard aluminum stranded wire 10 due to such bending, it is preferable to set the angle θ as small as possible.

[0036] In order to set the angle θ small, a layout in which the distance d described below is lengthened or the hole core 251 is brought closer to the central axis (two-dot chain line) of the hard aluminum stranded wire 10 is preferable, but on the other hand, if the distance d is lengthened, that is, if the length of the arm portion 230 is increased, the weight of the cotter member 200 increases to ensure strength, making it heavy and difficult to handle. After extensive studies, the inventors have found through prototypes that by setting the angle θ as described above to be 5° or more and 11° or less, both the problem of bending of the hard aluminum stranded wire 10 and the problem of the strength of the cotter member 200 can be solved in a well-balanced manner.

[0037] The inventors confirmed that setting the angle θ in the numerical range of 5° or more and 11° or less is specific to an aluminum alloy fastener 1 for fixing a hard aluminum stranded wire 10, and were able to create the fastener 1 of the present invention.

[0038] Next, a preferred example of the positional relationship between the cotter-side wire retaining concave surface 212 in the cotter member 200 and the connecting through-hole 250 (more specifically, the hole core 251) will be described. Fig. 10 is a diagram for explaining a preferred dimensional relationship for the end fastener 1 according to an embodiment of the present invention. In Fig. 10, the two-dot chain line indicates the central axis of the hard aluminum stranded wire 10.

[0039] The dashed lines in the drawing indicate planes perpendicular to the paper surface. The dashed lines on the left side of the drawing indicate a plane perpendicular to the central axis of the hard aluminum strand 10, including the end (cotter-side strand holding concave end 217) of the cotter-side strand holding concave surface 212 where the cotter member 200 holds the hard aluminum strand 10.

[0040] Meanwhile, the dashed line on the right side of the figure indicates a vertical plane that is parallel to the vertical plane indicated by the dashed line on the left side of the figure and that includes the hole center 251 of the connection through-hole 250. Here, assuming that the distance between the two vertical planes is d, the inventors have confirmed that the distance d is preferably 100 mm or more and 150 mm or less. However, this is premised on the fact that the diameter of the hard aluminum stranded wire 10 that can be fixed by the dead-end fitting 1 is 22.4 mm or more and 29.4 mm or less.

[0041] The reason why it is necessary to ensure a certain degree of distance d between the two vertical surfaces will be explained with reference to Fig. 11. Fig. 11 is a diagram showing an example of installation using a dead-end fastener 1 according to an embodiment of the present invention.

[0042] The fastening fitting 1 that fixes the hard aluminum stranded wire 10 is connected to an insulator 50 or the like by a connecting through hole 250. The insulator 50 is attached to a pillar or the like, whereby the hard aluminum stranded wire 10 is fastened.

[0043] The end of the hard aluminum stranded wire 10 fixed by the fastening fitting 1 is folded back at a fold-back portion 15 and is tied to the hard aluminum stranded wire 10 at the starting end side by a fastening member 60, so that the hard aluminum stranded wire 10 does not fall off from the fastening fitting 1. In order to form the fold-back portion 15 as described above, it is preferable in terms of construction efficiency that the distance d be set to 100 mm or more and 150 mm or less.

[0044] As described above, the fastener 1 of the present invention has a main body member 100 and a cotter member 200 made of an aluminum alloy, and with such fastener 1 of the present invention, the construction of fixing the hard aluminum stranded wire 10 can be performed easily and reliably in a short time without generating noise from a compressor or the like and regardless of the skill of the worker. [Explanation of symbols]

[0045] 1... Fastening hardware 10. Hard aluminum stranded wire 15... Folded part 50···Insulator 60... Fastening member 100...Main body member 113...Start end rib 115···Middle rib 117 End rib 123...Start end opening 127...End side opening 130... Wire insertion part 132... Body side wire retaining concave surface 140... Cotter member insertion portion 150...Slope step 153...Start of inclined step 157....Sloped step end 200 ···Cotter parts 210... Linear holding base 212 Cotter side wire retaining concave surface 213... Cotter side wire retaining concave surface start 217···Cotter side wire retention concave end 220 ··· Cutter part 223 ··· Start of cutter part 227 ··· End of cutter part 228 ··· Identification part 230 ··· Arm part 236 ··· Thin part 240 ··· Fork structure part 250 ··· Connecting through-hole 251 ··· Hole core

Claims

1. A fastener comprising a main body member and a cotter member that engages with the main body member, A hard aluminum strand is fixed between the body member and the cotter member in a boltless manner; The cotter member is provided with a connecting through hole, A fastener, characterized in that the main body member and the cotter member are made of an aluminum alloy.

2. 2. The fastener according to claim 1, wherein the aluminum alloy is AC4C or AC4CH as specified in JIS H5202.

3. The fastener according to claim 1, wherein the connecting through hole is provided in a bifurcated structure.

4. 2. The fastener according to claim 1, wherein the cotter member is provided with a thinned portion.

5. When the hard aluminum strand is fixed between the body member and the cotter member, A point where the central axis of the hard aluminum strand intersects with the opening at the start end of the main body member is designated as P, If a point where a center of the connecting through hole intersects with a plane perpendicular to the center of the hole and including a central axis of the hard aluminum strand is defined as O, 2. The end fastener according to claim 1, wherein an angle θ between a line segment OP and a central axis of the hard aluminum strand is 5° or more and 11° or less.

6. a perpendicular surface relative to a central axis of the hard aluminum strand, the concave end of which is used to hold the hard aluminum strand; 2. The fastener according to claim 1, wherein a distance between the vertical plane including the center of the connecting through-hole and a vertical plane parallel to the vertical plane is 100 mm or more and 150 mm or less.

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