JP3574441B2 - DV wire anchor made of synthetic resin - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin DV wire anchor for mooring a drop wire such as an electric wire into a house or the like when mooring the drop wire.
[0002]
[Prior art]
A DV wire anchor used for drawing an electric wire into a house or the like is known as disclosed in Japanese Patent Application Laid-Open Nos. 7-298466, 9-224320, and 9-308066. A screw shaft is integrally formed at an end of the main body, a through hole is formed at a tip end of the screw shaft so that a fastener can be inserted, and a plurality of shafts around which electric wires are wound on both side surfaces of the fastener main body. The shaft is integrally formed, and a flange formed at the tip of the shaft protrudes on both sides of the base of the screw shaft. The wire is pinched by screwing a tightening nut screwed onto the screw shaft. The body and the tightening nut of the DV wire anchor are conventionally formed of a synthetic resin such as an ABS resin.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned tightening nut has a problem that if the tightening force is weak, it may be loosened by vibration or the like, and if the tightening force is too strong, there is a problem that the vinyl coating of the electric wire may be peeled off.
In view of the above, the present invention is to provide a DV wire anchoring device that prevents excessive tightening of a tightening nut such as damaging an electric wire, and at the same time eliminates the possibility of loosening the tightening nut due to vibration or the like. Is what you do.
[0004]
[Means for Solving the Problems]
For this purpose, the DV wire anchor according to the present invention has a screw shaft integrally formed at an end of the fastener main body, and a through-hole through which a fastener can be inserted is formed at a tip end of the screw shaft. A plurality of shaft portions around which an electric wire is wound are integrally formed on both side surfaces of the shaft, and a flange portion is formed at a tip of the shaft portion so as to protrude on both sides of the base of the screw shaft, and is fastened to the screw shaft. In the DV wire anchoring device in which the attached nut is screwed, a recess is formed at the base of the screw shaft, an elastic rib is projected from the inner bottom surface of the recess, and the tightening nut is screwed when tightened. By tightening the nut against the elastic rib, the tightening nut is prevented from being loosened, and the electric wire wound around the shaft portion is immovably surrounded by the flange portion and the tightening nut. Features.
Further, the present invention is characterized in that in the DV wire anchoring device, a recess is formed at a position symmetrical on both sides of the base of the screw shaft, and an elastic rib is protruded from the inner bottom surface of the recess.
Further, the present invention is characterized in that in the DV wire anchoring device, the elastic rib is formed in a thin plate shape that is long in the axial direction.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a DV wire fastener according to the present invention, FIG. 2 is an exploded perspective view of a fastening nut 2 and a fastener body 3, FIG. 3 is a perspective view showing a use state, and FIG. FIG. 5 is a vertical sectional view of the DV line anchoring tool shown in FIG. The fastener body 3 is made of ABS resin having a screw shaft 4 integrally formed at an end thereof, and a long hole-shaped through hole 6 through which a fastener 5 can be inserted is formed at the tip of the screw shaft 4. ing. A pair of shafts 8, 8 and a pair of shafts 9, 9 and a pair of shafts 10, 10 around which the electric wire 7 is wound are formed at symmetrical positions on both side surfaces of the fastener body 3, respectively. A flange 8 ', 8', a flange 9 ', 9', and a flange 10 ', 10' are formed at the tip of each shaft. The flanges of the shafts 10, 10 formed near the screw shaft 4 are formed. The parts 10 ′, 10 ′ project on both sides of the base of the screw shaft 4.
[0006]
The recesses 11, 11 are formed at positions symmetrical on both sides of the base of the screw shaft so as to be continuous with the through holes 6, and elastic ribs 12, 12 project from the inner bottom surface of the recess. The elastic ribs 12, 12 are formed in a thin plate shape (wing shape) having a thickness of about 2 mm and a height of about 7 mm, and have the required elasticity and strength from this shape.
Further, the tightening nut 2 is made of ABS resin having a screw groove formed on an inner peripheral surface thereof which can be screwed into the screw shaft 4. By screwing this to the screw shaft 4, the end surface of the tightening nut 2 is formed. The elastic ribs 12 can be elastically deformed by being pressed against the elastic ribs 12.
[0007]
For this reason, by tightening the tightening nut 2 on the screw shaft 4, the electric wire 7 wound around the shaft portions 10, 10 as shown in the use state in FIGS. 10 'and surrounded by the end face of the fastening nut 2, falling off from the shaft portion 10 and 10 is prevented. That is, the electric wire 7, which is a DV wire, is held in a state of being wound around the shaft portions 10, 10 by being surrounded by the flange portions 10 ', 10' and the tightening nut 2 by its own shape retaining property, and falls off. Nothing. Further, the vinyl coating of the electric wire 7 is not peeled off by the tightening nut 2. Further, in this state, the fastening nut 2 is pressed against the elastic ribs 12 and 12 and always receives a reaction force from the elastic ribs, so that the electric wire 7 is stably moored for a long period of time without loosening due to vibration due to wind or the like. I can do it.
[0008]
Further, the elastic ribs 12, 12 protrude from the inner bottom surfaces of the recesses 11, 11, and have a sufficient elasticity because a required height is secured, so that the tightening nut 2 is attached to the elastic ribs 12, 11. Since it is possible to always be in a tensioned state by crimping to 12, the tightening is more difficult to be loosened.
Further, since the elastic ribs 12 and 12 are formed in the shape of a thin plate that is long in the axial direction, the frictional resistance of the pressure contact surface with the end surface of the tightening nut 2 increases, which also contributes to preventing loosening. I have.
[0009]
Incidentally, the tightening nut 2 is tightened to the elastic ribs 12, 12 with a torque of 20 kg · cm, and is vibrated in a horizontal direction and a vertical direction by a vibration tester at an amplitude of 5 mm and a frequency of 900 times / minute. As a result, the tightening nut did not loosen even after 5 hours in both the horizontal and vertical directions, and very satisfactory results were obtained.
[0010]
In addition, a tool such as a wrench is not required to tighten the tightening nut 2, and an ordinary worker always holds an appropriate tightening state by merely grasping and turning, thereby improving workability.
[0011]
【The invention's effect】
As described above, in the DV wire anchor according to the present invention, the screw shaft is integrally formed at the end of the fastener main body, and a through-hole through which a fastener can be inserted is formed at the tip of the screw shaft. A plurality of shaft portions around which the electric wire is wound are integrally formed on both side surfaces of the main body, and a flange portion is formed at the tip of the shaft portion so as to project to both sides of the base of the screw shaft. In a DV wire anchoring device in which a tightening nut is screwed , a concave portion is formed at a base of a screw shaft, and an elastic rib is protruded from an inner bottom surface of the concave portion. Since the attached nut is pressed against the elastic rib, the tightening nut is prevented from loosening, and the electric wire wound around the shaft portion is immovably surrounded by the flange portion and the fastening nut . Even if the tightening nut is tightened more than necessary, this will not damage the wire, And, since the possibility of loosening the fastening nut is eliminated by the reaction force of the elastic rib, there is a beneficial effect that may reliably anchor the wire over a long period of time.
[Brief description of the drawings]
FIG. 1 is a perspective view of a DV wire anchor according to the present invention.
FIG. 2 is an exploded perspective view of the DV wire fastening tool of FIG. 1;
FIG. 3 is a perspective view showing a use state of the DV wire anchor of FIG. 1;
FIG. 4 is a vertical cross-sectional view of the DV wire fastening tool in use.
FIG. 5 is a sectional view taken along line AA of FIG. 4;
[Explanation of symbols]
2 Tightening nut 3 Fastener body 4 Screw shaft 5 Clamp 6 Through hole 7 Electric wires 8, 9, 10 Shaft 8 ', 9', 10 'Collar 11 Recess 12 Resilient rib

Claims (3)

A screw shaft is integrally formed at an end of the fastener main body, a through-hole through which a fastener is inserted is formed at a tip end of the screw shaft, and a plurality of wires around which electric wires are wound on both side surfaces of the fastener main body. A DV wire having a shaft portion integrally formed, a flange portion formed at the tip of the shaft portion so as to protrude on both sides of the base of the screw shaft, and a tightening nut screwed onto the screw shaft. In the fastening device, a recess is formed at the base of the screw shaft, an elastic rib is protruded from the inner bottom surface of the recess, and when the tightening nut is screwed, the tightening nut is pressed against the elastic rib. A synthetic resin DV wire anchoring device, characterized in that the attached nut is prevented from being loosened and the electric wire wound around the shaft is undetachably surrounded by the flange and the fastening nut . The DV wire anchor according to claim 1, wherein a recess is formed at a position symmetrical on both sides of the base of the screw shaft, and an elastic rib is protruded from an inner bottom surface of the recess. The DV wire anchor according to claim 1, wherein the elastic rib is formed in a thin plate shape that is long in the axial direction.

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