Manufacturing method of arm

Abstract

To provide a cross arm which can be attached to a utility pole with good workability.SOLUTION: A cross arm 1 is made of an aluminum profile, and has a plurality of projecting pieces 2 integrally provided on the side along the longitudinal direction, and a recessed portion 3 to be fitted with a utility pole 4 is formed by notching the projecting piece 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cross arm attached to a utility pole. Manufacturing method Regarding. [Background technology]

[0002] Electric poles are fitted with cross arms to carry electric wires. Conventionally, cross arms have been made of steel square pipes, and their installation can require high-altitude work. Therefore, there is a demand for a method that allows cross arms to be installed on electric poles with ease. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above-mentioned circumstances, the present invention provides a cross arm that can be easily attached to a utility pole. Manufacturing method The purpose is to provide. [Means for solving the problem]

[0004] In order to achieve the above object, the invention of claim 1 is Manufacturing method has multiple protrusions on the side of Integral along the longitudinal direction Forming aluminum extrusions By cutting out the protruding piece, a recess is formed to fit into the utility pole. do It is characterized by: [Effects of the Invention]

[0005] The arm according to the invention of claim 1 Manufacturing method has multiple protrusions on the side of Integral along the longitudinal direction Forming aluminum extrusions By cutting out the protruding piece, a recess is formed to fit into the utility pole. By doing It is lightweight, can be positioned relative to the utility pole, and does not require the attachment of positioning parts by welding or the like, so it can be attached to the utility pole with good workability. [Brief explanation of the drawings]

[0006] [Figure 1] FIG. 1 is a perspective view showing an embodiment of an arm of the present invention. [Figure 2] (a) is a plan view of the arm, and (b) is a front view of the arm. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 10 is a perspective view showing another embodiment of the bracket of the present invention. [Figure 6] FIG. 10 is a perspective view showing yet another embodiment of the bracket of the present invention. [Figure 7] FIG. 1 is a perspective view showing an example of a state in which the bracket of the present invention is used. [Figure 8] 8(a) is a plan view of the bracket shown in FIG. 7, and FIG. 8(b) is a front view of the bracket. [Figure 9] FIG. 8 is a side view of the bracket shown in FIG. 7. DETAILED DESCRIPTION OF THE INVENTION

[0007] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figures 1 to 4 show an embodiment of an arm 1 of the present invention. This arm 1 is made from an extruded aluminum alloy profile, and as shown in Figures 1 and 4, is cylindrical with a substantially square cross section, having an upper wall 5, a lower wall 6, and a pair of side walls 7, 7. Two upper and lower protrusions 2, 2 are provided along the longitudinal direction on the side of the arm 1 on the utility pole side 4. The upper and lower protrusions 2, 2 are formed flush with the upper wall 5 and the lower wall 6, respectively. This arm 1 has a trapezoidal recess 3 formed in a plan view by cutting out the upper and lower protrusions 2, 2 by press working or the like. This arm 1 can be positioned relative to the utility pole 4 by fitting the recess 3 formed in the protrusions 2, 2 into the utility pole 4, as shown in Figure 2(a). Long holes 9, 9 are formed along the longitudinal direction on the side walls 7, 7 of the arm 1, through which bolts 8, 8 are inserted to fix the arm 1 to the utility pole 4. In addition, the arm 1 is appropriately formed with mounting holes for mounting devices (not shown) such as insulators that receive electric wires.

[0008] As shown in Figures 1 and 2, this arm 1 is positioned relative to the utility pole 4 by fitting the recesses 3 formed in the protrusions 2, 2 into the utility pole 4, and then a band 10 is wrapped around the utility pole 4. Nuts 11, 11 are held at both ends of the band 10, and bolts 8, 8 are threadedly engaged with the nuts 11, 11. The bolts 8, 8 are inserted into the long holes 9, 9 of the arm 1, and nuts 12, 12 are threadedly engaged with the tips of the bolts 8, 8 and tightened, thereby fixing the arm 1 to the utility pole 4.

[0009] Figure 5 shows another embodiment of the cross arm 1 of the present invention. This cross arm 1 has a recess 3 formed in a protrusion 2 at a position close to the end in the longitudinal direction of the cross arm 1, and a utility pole 4 is fitted into the recess 3 so that the cross arm 1 is fixed to the utility pole 4 at a position close to the end in the longitudinal direction. In this way, by changing the position of the recess 3, this arm 1 can be used for either a center-fastening installation (Fig. 1) in which the center portion in the longitudinal direction is fixed to the utility pole 4, or a one-sided installation (Fig. 5) in which the end portion in the longitudinal direction is fixed to the utility pole 4. Also, the recess 3 may be formed in two locations from the beginning: approximately in the center position in the longitudinal direction and near the end portion.

[0010] Figure 6 shows yet another embodiment of the cross arm 1 of the present invention. The cross arm 1 of this embodiment has four protrusions 2 spaced apart in the vertical direction, and each protrusion 2 is cut out to form a recess 3. By increasing the number of protrusions 2 in this way, the strength of the cross arm 1 is increased, and the cross arm 1 is more firmly positioned relative to the utility pole 4, preventing the cross arm 1 from tilting. By making the number of protrusions 2 an even number, the elongated hole 9 for inserting the bolt 8 can be formed in the vertical center of the side wall 7 without interfering with the protrusions 2.

[0011] The cross arm 1 of the present invention can be used to install electric wires and signal lines, as well as to attach various devices. Figures 7 to 9 show an example of how the cross arm 1 of the present invention is used, showing an example in which an antenna 13 serving as a base station for a fifth-generation mobile communication system (5G) is attached. The arm 1 itself is the same as that shown in Figures 1 to 4 described above, and is attached to the utility pole 4 by fitting the utility pole 4 into the recess 3 formed in the protrusion 2. As shown in Figures 8 and 9, the rear end of a bracket 14 for mounting an antenna is engaged with the arm 1 so as to be slidable longitudinally between the upper and lower protrusions 2, 2, and the bracket 14 is fixed to the arm 1 with bolts (not shown). The bracket 14 has an antenna mounting portion 15 at the front, and the antenna 13 abuts against the antenna mounting portion 15 and is fixed with screws (not shown). The bracket 14 is formed from an aluminum extrusion. In this way, by engaging and attaching the bracket 14 for attaching the antenna between the protrusions 2, 2 of the arm 1, the antenna 13 can be attached stably and easily to the arm 1. The attachment position of the antenna 13 can also be easily changed by sliding the bracket 14 in the longitudinal direction of the arm 1.

[0012] As described above, this arm 1 is made of an aluminum extrusion, with multiple protrusions 2, 2 formed integrally on the side along the longitudinal direction, and recesses 3 that fit into the utility pole 4 formed by cutting out the protrusions 2, 2, so it is lightweight and can be positioned relative to the utility pole 4, and there is no need to attach positioning parts by welding or the like, making it easy to attach to the utility pole 4. Multiple protrusions 2 are provided at intervals above and below, and by providing recesses 3 in each protrusion 2 and fitting them into the utility pole 4, it is possible to regulate the tilt of the arm 1. This arm 1 is easy to manufacture, as it can be made by simply cutting the aluminum extrusion to the specified length and forming the recesses 3 by press working. Furthermore, because the arm 1 is made of aluminum extrusions, it is lighter and easier to handle than conventional steel ones. Also, because it is made of aluminum extrusions, it has excellent weather resistance, so maintenance costs are kept down and it is cost-effective. By changing the position of the recess 3, the arm 1 can be used for both center-mounted and one-sided mounting. Furthermore, by engaging and attaching a bracket 14 for attaching equipment between the plurality of protruding pieces 2, 2, the arm 1 can stably attach equipment (antenna) 13 to the arm 1 with good workability.

[0013] The present invention is not limited to the above-described embodiments. The cross-section of the cross arm may be rectangular, trapezoidal, or the like. The shapes of the protrusions and recesses may be modified as appropriate. Utility poles include power poles and telegraph poles. The uses of the cross arm of the present invention are not particularly limited, and may be used to install electric wires and cables, as well as to attach antennas, road signs, etc. [Explanation of symbols]

[0014] 1 armor 2 protrusions 3 recess 4. Electric poles

Claims

[Claim 1] A method for manufacturing an arm, characterized by forming an aluminum extrusion having multiple protrusions integrally formed on the side along the longitudinal direction, and cutting out the protrusions to form recesses that fit into the utility pole.

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