Suspension wire protection cover

Abstract

To provide a hanging wire protection cover that does not require a separate small retaining pin which is difficult to handle, and simplifies an installation and removal work at a high place.SOLUTION: A pair of split bodies 2 are so arranged as to be alternately shifted in a wire extension direction with a hanging wire interposed between the top and bottom, and semi-cylindrical parts 3 are slid, and are butted so that mutual fitting parts 6 are fitted to mutual notches 5. By pushing a fixation pin 10, which is held in such a manner that a tip thereof is inserted in a hole 71 of each split body 2, into a hole 81, the fixation pin 10 is automatically retained, and an installation work for a protection cover 1 is completed. In order to remove the protection cover 1 from the hanging wire, a snap part 102 projecting from the hole 81 is diameter-reduced by finger operation to pull out the fixation pin 10, thereby shifting the pair of split bodies 2. Since the snap part 102 of the fixation pin 10 is retained in a holding space 71b even if the split bodies 2 are separated, the fixation pin 10 does not fall during operation or storage.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a protective cover for overhead wires in electric railroad tracks, which eliminates the need to insert and remove a separate locking pin when attaching or detaching the cover to or from the overhead wire, thereby simplifying installation and removal work at high altitudes. [Background technology]

[0002] The basic form of a suspension wire protection cover is disclosed, for example, in Patent Document 1. It consists of a pair of divided bodies with a flange at one end of the semi-cylindrical part and a fitting part protruding radially at the other end, and the flanges are provided with notches into which the fitting part of the other divided body can be fitted, and the two divided bodies are slidably engaged in an alternating manner to form a spool-like shape. In the above-mentioned known example, pin holes are provided in parts of the flange and the fitting portion so as to penetrate both of them, and a split pin is inserted into these holes to prevent the split bodies from slipping out of each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 60-1634 Summary of the Invention [Problem to be solved by the invention]

[0004] Installing protective covers is a high-altitude job and often requires work at night. Inserting pins into small pin holes in the dark on a ladder or work vehicle is no easy task. It is also common for split pins to be accidentally dropped. Therefore, an object of the present invention is to provide a suspension wire protection cover that does not require a separate small anti-slip pin that is difficult to handle and that simplifies installation and removal work at high altitudes. [Means for solving the problem]

[0005] In the following description, reference will be made to the reference numerals in the accompanying drawings, but the present invention is not limited thereto. In order to solve the above problem, the suspension wire protection cover 1 of the present invention comprises a pair of divided bodies 2 each having a flange portion 4 with a notch portion 5 at one end of a semi-cylindrical portion 3 and a fitting portion 6 protruding radially at the other end, and by engaging the pair of divided bodies 2 alternately in the axial direction of the semi-cylindrical portion 3, the notch portion 5 of one divided body 2 is fitted into the fitting portion 6 of the other divided body 2, and the two bodies are assembled in the shape of a spool. Each divided body 2 is equipped with a first and second pair of locking projections 7, 8 which extend outward parallel to each other perpendicular to the flange portion 4 from the opposing edges of the cutout portion 5, and which have circular holes 71, 81 passing through between them; an engaging projection 9 which protrudes outward from the engaging portion 6 and can be fitted between the pair of locking projections 7, 8 of the other divided body 2 to be assembled, and which has a through hole 91 which communicates with the circular holes 71, 81 of the locking projections 7, 8 when fitted; and a round bar-shaped fixing pin 10 whose tip side protrudes from the second locking projection 8 when inserted from the first locking projection 7 side so as to pass through the circular holes 71, 81 and through hole 91 which communicate between the mutually fitted locking projections 7, 8 and the engaging projection 9. The fixing pin 10 has a head 101 at its base end that cannot pass through the circular hole 71 of the first locking projection 7, and an arrowhead-shaped snap portion 102 at its tip end that can be elastically contracted. The circular hole 71 of the first locking projection 7 is formed as a stepped circular hole with a small-diameter portion 71a on the outside and a large-diameter portion 71b on the inside. The small-diameter portion 71a has an inner diameter that allows the snap portion 102 to pass through when it is contracted but not when it is expanded, and the large-diameter portion 71b forms a holding space with an inner diameter that can hold the snap portion 102 when it is expanded. The through-hole 91 of the fitting projection 9 has an inner diameter that allows the snap portion 102 to pass through when it is contracted. The circular hole 81 of the second locking projection 8 has an inner diameter that allows the snap portion 102 to pass through when it is contracted but not when it is expanded. The snap portion 102 is formed so that, when it projects from the circular hole 81 of the second locking projection 8 and has an expanded diameter, it can be reduced in diameter by manual operation and passed through the circular hole 81, through the through-hole 91, and in the holding space 71b until it expands in diameter and is prevented from coming out. As a result, when the pair of segments 2 are separated, the fixing pin 10 is held by the first locking projection 7 without coming out of the segments 2. [Effects of the Invention]

[0006] According to the present invention, the fixing pin 10 for connecting the pair of segments 2 is always held without coming off the segments 2, which simplifies the work and eliminates the risk of accidentally dropping the fixing pin 10 during the work of attaching or detaching it to or from the suspension wire W. Furthermore, the fixing pin 10 has a simple and robust structure, which helps prevent environmental degradation. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 2 is a perspective view of the suspension wire protection cover of the present invention. [Figure 2] FIG. 2 is an exploded perspective view of the suspension wire protection cover of FIG. 1. [Figure 3] FIG. 2 is a front view of the suspension wire protection cover of FIG. [Figure 4] FIG. 2 is a right side view of the suspension wire protection cover of FIG. [Figure 5] FIG. 2 is a plan view of the suspension wire protection cover of FIG. [Figure 6] 2A and 2B are enlarged cross-sectional views of the fixing pin insertion portion of the suspension wire protection cover of FIG. 1, where (A) shows the state in which the fixing pin has been removed, (B) is an enlarged cross-sectional view of VIB-VIB in FIG. 1, and (C) is an enlarged cross-sectional view of VIC-VIC in FIG. 2. [Figure 7] 2 is a front view of a divided body that constitutes the overhead wire protection cover of FIG. 1. FIG. [Figure 8] 2 is a right side view of a segment that constitutes the suspension wire protection cover of FIG. 1. FIG. [Figure 9] 2 is a plan view of a divided body that constitutes the overhead wire protection cover of FIG. 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. As clearly shown in Figures 1 and 2, the overhead wire protective cover 1 is made by combining a pair of segments 2 of the same shape and size. Each segment 2 is made of synthetic resin and has a semi-cylindrical portion 3, a flange 4 provided at one end thereof with a notch 5 in part, and a fitting portion 6 protruding radially from the other end. The pair of segments 2 are arranged opposite each other so as to sandwich the overhead wire W and are engaged alternately in the axial direction of the semi-cylindrical portions 3, whereby the notch 5 of one segment 2 is fitted into the fitting portion 6 of the other segment 2, and the overhead wire protective cover 1 is assembled like a spool, as shown in Figure 1.

[0009] Each divided body 2 is provided with a first and second pair of locking projections 7, 8 that extend parallel to each other outward from opposing edges of the cutout 5 and perpendicular to the flange 4. The pair of locking projections 7, 8 have circular holes 71, 81 that pass through between them.

[0010] An outwardly protruding mating piece 9 is formed on the mating portion 6. The mating piece 9 can be fitted between a pair of locking pieces 7, 8 of the other divided body 2 to be assembled, and has a through hole 91 that communicates with the circular holes 71, 81 of the locking pieces 7, 8 when fitted.

[0011] A fixing pin 10 is inserted from the first locking projection side 7 through the circular holes 71, 81 and the through hole 91 that communicate between the mutually fitted locking projections 7, 8 and the fitting projection 9, thereby joining the pair of divided bodies 2 as shown in Figures 1, 3 to 5.

[0012] The fixing pin 10 is in the shape of a round bar and has a head 101 at the base end that cannot pass through the circular hole 71 of the first locking projection 7, and an arrowhead-shaped snap portion 102 at the tip end that can be elastically contracted in diameter.

[0013] 6, the snap portion 102 has a pair of elastic legs 104 that are bifurcated by a flared slot 103 formed on the tip side of the fixing pin 10, and an arrowhead-shaped engaging portion 105 that protrudes from the outer periphery of the tip of the elastic legs 104. The diameter of the elastic legs 104 can be elastically contracted by manual finger manipulation.

[0014] 6, the circular hole 71 of the first locking projection 7 is formed as a stepped circular hole having a small diameter portion 71a on the outside and a large diameter portion 71b on the inside. The small diameter portion 71a has an inner diameter that allows the reduced diameter snap portion 102 to pass through but not the expanded diameter snap portion 102, and the large diameter portion 71b forms a holding space with an inner diameter that allows the expanded diameter of the snap portion 102 to be held (FIG. 6(C)).

[0015] The through hole 91 of the fitting projection 9 has an inner diameter that allows the reduced diameter snap portion 102 to pass through.

[0016] The circular hole 81 of the second locking projection 8 has an inner diameter that allows the snap portion 102 to pass through when reduced in diameter, but does not allow the snap portion 102 to pass through when increased in diameter.

[0017] 6(B), the snap portion 102 is prevented from coming off when it projects from the circular hole 81 of the second locking piece 8 and expands in diameter. The pair of divided bodies 2 are joined together by the fixing pin 10 in this state.

[0018] As shown in Fig. 6(B), by manually reducing the diameter of the snap portion 102 that protrudes from the circular hole 81 and has an expanded diameter, and pulling the fixing pin 10 to the left in the figure, the fixing pin 10 can be pulled out from the circular hole 81 through the through-hole 91 to the state shown in Fig. 6(C) where the snap portion 102 has expanded in diameter in the retaining space 71b. In this state, the pair of divided bodies 2 can be separated. Even if the pair of divided bodies 2 are separated, the fixing pin 10 will not come off the divided body 2 because the snap portion 102 is prevented from coming off in the retaining space 71b.

[0019] When attaching the protective cover 1 to the overhead wire W, the pair of segments 2 are shifted alternately in the extension direction, positioned so as to sandwich the overhead wire W from above and below, and the semi-cylindrical portions 3 are slid against each other to butt together so that the mating portions 6 fit into each other's notches 5. In this state, as shown in Figure 6(C), when the fixing pin 10, whose tip is inserted and held in the circular hole 71 of the first locking projection 7 of each segment 2, is pushed into the circular hole 71 until the head 101 abuts against the first locking projection 7, the fixing pin 10 is automatically prevented from coming out, and the attachment of the protective cover 1 is completed.

[0020] To remove the protective cover 1 attached to the suspension wire W in this manner, as shown in Fig. 6(B), the snap portion 102 protruding from the circular hole 81 is manually contracted in diameter, and as shown in Fig. 6(C), the fixing pin 10 is pulled out and the pair of segments 2 is shifted in the wire extension direction. Even if the pair of segments 2 are separated, the snap portion 102 of the fixing pin 10 is prevented from coming off in the retaining space 71b, so the fixing pin 10 will not fall off during the work. [Explanation of symbols]

[0021] 1. Suspension wire protection cover 2 split body 3 Semi-cylindrical section 4 Tsuba 5 Notch 6 Fitting part 7 First locking projection 71 Round hole 71a Small diameter section 71b Large diameter part (retaining space) 8 Second locking protrusion 81 Round hole 8b Engagement protrusion 9. Mating protrusion 91 Through hole 10 fixing pin 101 Head 102 Snap part 103 Slit 104 Elastic Legs 105 Engagement part W Suspension line

Claims

1. A suspension wire protection cover is comprised of a pair of divided bodies made of synthetic resin, each of which has a semi-cylindrical portion, a flange portion with a notch provided at one end of the semi-cylindrical portion, and a fitting portion protruding radially from the other end, and which is assembled in a spool-like shape by alternately engaging the pair of divided bodies in the axial direction of the semi-cylindrical portion so that the fitting portion of one divided body fits into the notch of the other divided body, Each of the divided bodies includes a first and a second pair of locking projections extending parallel to each other outward from opposing edges of the notch, perpendicular to the flange, and having a circular hole passing therethrough; a fitting projection protruding outward from the fitting portion, capable of being fitted between a pair of locking projections of the other divided body to be assembled, and having a through hole communicating with the circular hole when fitted; a round-bar-shaped fixing pin whose tip end protrudes from the second locking projection when inserted from the first locking projection side so as to pass through the circular hole and the through-hole communicating between the mutually fitted locking projection and the fitting projection, the fixing pin has a head portion at a base end thereof that cannot pass through the circular hole of the first locking projection, and has an arrowhead-shaped snap portion at a tip end thereof that can be elastically contracted in diameter; the circular hole of the first locking projection is formed as a stepped circular hole having a small diameter portion on the outside and a large diameter portion on the inside, the small diameter portion having an inner diameter through which the reduced diameter snap portion can pass but through which the expanded diameter snap portion cannot pass, the large diameter portion forming a holding space having an inner diameter that can hold the expanded diameter snap portion, the through hole of the fitting protrusion has an inner diameter that allows the reduced diameter snap portion to pass through; the circular hole of the second locking projection has an inner diameter through which the reduced-diameter snap portion can pass but through which the expanded-diameter snap portion cannot pass; the snap portion is formed so that, in a state where it projects from the circular hole of the second locking projection and has an expanded diameter, it can be reduced in diameter by a manual operation and passed in a removal direction from the circular hole through the through hole to the holding space where it has an expanded diameter and is prevented from coming out, As a result, when the pair of divided bodies are in a separated state, the fixing pin is held by the first locking protrusion without coming off the divided bodies, thereby forming a suspension wire protection cover.

2. The suspension wire protection cover described in claim 1, characterized in that the snap portion comprises a pair of elastic legs that are bifurcated by a flared slot formed on the tip side of the fixing pin, and an arrowhead-shaped engagement portion protruding from the outer periphery of the tip of the elastic legs.

Images