JP5061230B2 - Low wind pressure bird damage prevention device - Google Patents

Description

  The present invention relates to a low wind pressure bird damage prevention device for preventing wild birds from stopping on an aerial cable such as a power line or a communication line, and causing a flashing or dropping damage.

  The bird damage prevention devices described in the following Patent Documents 1 to 3 are arranged with a pair of left and right annular supports having a through hole in the center, and spaced apart from each other along the periphery of the support. A rotating body in the form of a bowl is formed from a plurality of bar members each fixed to the support, and the rotating body is rotated by inserting an aerial cable such as an electric wire into the through hole of the support. If a wild bird such as a crow tries to stop on the bar, the rotating body will not rotate and stop at the weight of the wild bird, and bird damage can be prevented.

  In addition, Patent Documents 4 and 5 below integrally form an arc-shaped rim at both ends and a plurality of rod-shaped portions extending between the arc-shaped rims by plastic injection molding, and a pair of the plastic molded bodies. Bird damage preventers that are attached so that they can rotate freely on the outer periphery of the aerial cable by arranging them so that the inner peripheral sides of each arc-shaped rim face each other with an aerial cable in between and using a connecting pin Is shown. Such a bird harm prevention device by integral molding of plastic has the advantage that it can be manufactured at a lower cost than the bird harm prevention device because it requires fewer parts and is easy to assemble.

Japanese Examined Patent Publication No. 4-77529 Japanese Patent Publication No. 5-86125 JP 2006-20557 A JP 2006-180818 A JP 2007-244232 A

  However, as shown in Patent Documents 3 and 4, a conventional rotary bird damage preventer by integral plastic molding has six rod-shaped portions, which are heavy and difficult to rotate. Since the portion was in the shape of a strip, there was a problem that the load on the overhead cable and the utility pole would become very large by installing the bird damage prevention device because the air resistance was large and the wind pressure was received during strong winds.

  The present invention is intended to solve the above-mentioned problem, and is a rotary bird damage prevention device in which a pair of plastic molded bodies are rotatably attached to the outer periphery of an aerial cable in a bonded state, and each plastic molded body is , A semi-arc-shaped rim at both ends, and three parallel rod-shaped portions integrally formed between the two arc-shaped rims, two of the rod-shaped portions being both end portions of the semi-arc-shaped rim The other cross section extending from the outer edge of the semi-circular rim is substantially semicircular in cross section and the other cross section extending from the outer edge of the intermediate portion of the semicircular arc rim has a substantially circular cross section. A low wind pressure characterized in that the plastic molded body is attached to the outer periphery of the aerial cable in a state where the rod-like portions having a substantially semicircular cross section are superimposed in a substantially circular cross section. Bird damage prevention device.

  Since the bird damage prevention device according to the present invention has low air resistance and can reduce the wind pressure received during strong winds, the load on the overhead cable and the utility pole is greatly reduced.

The disassembled perspective view of the low wind pressure bird harm prevention device which concerns on this invention. The perspective view in the middle of the assembly of the low wind pressure bird damage preventer according to the present invention. FIG. 3 is a sectional view taken along line AA in FIG. 2. The perspective view of the attachment state of the low wind pressure bird harm prevention device which concerns on this invention. The side view of the attachment state of the low wind pressure bird harm prevention device which concerns on this invention. BB sectional drawing of FIG. The CC sectional view taken on the line of FIG. The perspective view which shows the use condition of the low wind pressure bird damage prevention device which concerns on this invention.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a pair of plastic molded body 1a and plastic molded body 1b formed by injection molding a synthetic resin having weather resistance such as polycarbonate (PC), polycarbonate ABS (PC / ABS), and hard polyethylene (PE). Show. Since the plastic molded body 1a and the plastic molded body 1b have a portion having the same shape and a different shape, first, the same shape portion will be described. Each plastic molded body 1a, 1b is formed with semi-arc-shaped rims 2, 3 at both ends, and three rod-shaped parts 4, 5, 6 are integrally formed in parallel between both arc-shaped rims 2, 3. Molded. Of these rod-shaped portions, the two rod-shaped portions 4 and 6 are extended from the outer edges of both end portions of the semicircular arc-shaped rims 2 and 3, and as shown in FIG. It is almost semicircular. The other rod-like portion 5 is extended from the outer edge of the intermediate portion of the semicircular arc-shaped rims 2 and 3, and its cross-sectional shape is substantially circular. Further, semi-annular coupling bodies 7 to 11 connecting the rod-like portions 4, 5, 6 are integrally formed in a plane perpendicular to the rod-like portions in the longitudinal direction of the rod-like portions 4, 5, 6. is doing. Of these coupling bodies 7 to 11, the coupling bodies 7, 9, 11 are formed in a thin shaft shape having an elliptical cross section, and the coupling body 8 and the coupling body 11 are formed in a wide band shape having an elliptical cross section. Thus, the rod-like parts 4, 5, 6 are reinforced by these connecting bodies 7-11.

  Moreover, the half cylinder part 2a is integrally shape | molded on the outer surface of one circular arc-shaped rim 2, and the outward collar 2b is integrally shape | molded at the front-end | tip of this half cylinder part 2a. Further, a semi-cylindrical portion 3a having a larger diameter than the semi-cylindrical portion 2a is integrally formed on the outer surface of the other arc-shaped rim 3, and an inward flange 3b is integrally formed at the tip of the semi-cylindrical portion 3a. These are for connecting a plurality of rotary bird harm preventers to each other in the longitudinal direction. Reference numerals 2c and 3c denote long holes formed in the half cylinder part 2a and the half cylinder part 3a for both ventilation and weight reduction. The plastic molded body 1a and the plastic molded body 1b have the same shape as described above.

  Next, a description will be given of a portion whose shape is different between the plastic molded body 1a and the plastic molded body 1b. One plastic molded body 1 a is integrally formed with four support shafts 12 at an appropriate interval in the longitudinal direction of the rod-shaped portion 4 outside the rod-shaped portion 4. Further, the other plastic molded body 1 b is integrally formed with four bearings 13 at an appropriate interval in the longitudinal direction of the rod-shaped portion 4 outside the rod-shaped portion 4. Then, by rotatably fitting the support shaft 12 into the bearing 13, as shown in FIGS. 2 and 3, the plastic molded body 1a and the plastic molded body 1b are assembled so as to be freely opened and closed like a hinge. .

  In addition, four upright pieces 14 are integrally formed on the outer side of the rod-shaped portion 6 of one plastic molded body 1a at an appropriate interval in the longitudinal direction of the rod-shaped portion 6, and a connecting pin 15 is formed integrally with the upright piece 14. The tip 16 of the connecting pin is formed into a gooseneck shape. Reference numeral 17 denotes a die punching hole necessary for integrally forming the tip portion 16 with a mold. Further, an engaging portion 18 facing each of the connecting pins 15 is formed outside the rod-like portion 6 of the other plastic molded body 1b, and a rectangular engaging hole 19 is formed in the engaging portion 18. Further, the peripheral portion of the engaging portion 18 is formed integrally with a rib 20 so as to surround the inside of the engaging hole 19, and a slit-like opening 22 is formed on the upper wall surface 21 of the rib 20. Yes.

  The plastic molded body 1a and the plastic molded body 1b are assembled so as to be freely opened and closed as described above. For the aerial cable 23 such as an electric wire shown in FIG. 8, the plastic molded body 1a and the plastic molded body 1b Then, both molded bodies are overlapped so that the aerial cable 23 is sandwiched, and a pinching tool such as a pliers or pliers is used with the distal end portion 16 of the connecting pin 15 facing the engagement hole 19 of the engagement portion 18. By sandwiching the upright piece 14 and the engaging portion 18, the distal end portion 16 of each connecting pin 15 is forcibly inserted into the engaging hole 19 of the engaging portion 18. At that time, the connecting pin 15 is once elastically bent and the tip 16 engages with the engagement hole 19 by elastic restoration when the tip 16 passes through the engagement hole 19. The fitting state shown in Fig. 2 is maintained. In this bonded state, as shown in FIG. 7, the rod-shaped portion 4 having a substantially semicircular cross section of the plastic molded body 1a and the rod-shaped portion 4 having a substantially semicircular cross section of the plastic molded body 1b have a substantially circular cross section. In this state, the rod-shaped portion 6 having a substantially semicircular cross section of the plastic molded body 1a and the rod-shaped portion 6 having a generally semicircular cross section of the plastic molded body 1b are also superimposed in a substantially circular shape. For this reason, the stick-like portions 4 and 6 of both plastic molded bodies 1a and 1b are formed into one stick-like appearance by this bonding, and the air resistance is reduced so that excessive wind pressure is not required even in strong winds. . In addition, by making the plastic molded body 1a and the plastic molded body 1b in a bonded state in this way, the half-cylindrical parts 2a and the half-cylindrical parts 2b are also bonded together to form a cylinder, The connected bodies 7 to 11 are formed into an annular shape in appearance by this bonding.

  Further, in order to connect a plurality of bird harm preventers in the longitudinal direction as shown in FIG. 8, the other half cylinder part 3a is put on the outer periphery of one half cylinder part 2a, and the outward flanges 2b and By engaging the inward-facing rod 3b, each bird damage prevention device is attached to the aerial cable 23 so as to be independently rotatable.

  In this embodiment, both plastic molded bodies can be opened and closed like a hinge by rotatably fitting a shaft molded on the other plastic molded body to a shaft supporting section molded on one plastic molded body. Although it is configured, a connecting pin may be formed integrally with a plastic molded body and may be attached by the connecting pin, or it may be attached using a connecting pin of a separate part formed separately. Also good.

  In this bird harm prevention device, the plastic molded body 1a and the plastic molded body 1b are bonded together, whereby the rod-like portions 4 and the rod-like portions 6 of the plastic molded bodies are overlapped with each other, as shown in FIG. In addition, there are four rod-shaped parts in appearance and each has a substantially circular cross section, so that the air resistance is reduced without impairing the strength, and the wind pressure received during strong winds is greatly reduced. Can be reduced. Moreover, because the four are arranged at equal intervals of 90 degrees, the balance is good, not only large wild birds, but even small wild birds with low weight, if they stop, they will rotate reliably and attract many wild birds. Can not be.

DESCRIPTION OF SYMBOLS 1a, 1b Plastic molded object 2,3 Semi-arc shaped rim | limbs 4,5,6 Rod-shaped part 7-11 Connection part 12 Support shaft 13 Bearing 14 Standing piece 15 Connection pin 16 Tip part 18 Engagement part 19 Engagement hole 23 Aerial cable

Claims (1)

  A rotary bird harm prevention device in which a pair of plastic moldings are rotatably attached to the outer periphery of an aerial cable, the plastic moldings comprising semicircular arc rims at both ends, Three parallel rod-shaped portions integrally formed between the arc-shaped rims, two of the rod-shaped portions having a substantially semicircular cross section extending from the outer edges of both end portions of the semi-arc-shaped rim. The other one rod-shaped portion has a substantially circular cross section extending from the outer edge of the intermediate portion of the semicircular arc-shaped rim, and is crossed by bringing the pair of plastic molded bodies into a joined state. A low wind pressure bird damage prevention device characterized in that each rod-like portion having a substantially semicircular surface is attached to the outer periphery of an aerial cable in a state of being overlapped in a substantially circular cross section.

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