TWI693762B - Cord and wire puller - Google Patents

Abstract

A cord is provided in the present invention, in which the cord has a diameter at a first position which is greater than its diameter at a second position. The cord includes at least two spirally twisted helical threads. At least one of the helical threads is a contiuuous thread without break, and its diameter at the first position is greater than its diameter at the second position. The tensile strength of this design can be significantly improved, and the flexibility of different positions of the cord can also be achieved.

Description

Wire and threader

The invention relates to a threader and a wire rod for passing through pipes or other narrow passages in a building body.

The threader can be used to guide cables or the like through pipes or other narrow channels in the building. When the threader needs to pass through a long narrow pipeline (for example, more than 30 meters), the threader not only needs to There is sufficient compressive and tensile strength to load the friction force from the pipeline, and the free end usually needs to maintain better flexibility.

The existing threader has, for example, three helical spirals, and the diameter of these spirals is uniform in the axial direction, that is, the tensile strength and flexibility of the threading lead are substantially the same throughout the axial direction.

In order to give different physical properties in different sections of the threader, the applicant has recently developed a threader and wire as contained in TW I549393. The first and second threading wires with different wire diameters are helically twisted in the transition section. The first and second lead wires with different wire diameters can be applied in different use occasions, so that different sections of the threader have different physical characteristics. However, due to the discontinuous breakpoint in the axial direction of the lead-through wire disclosed in TW I549393, in actual tests, when the first lead-through wire diameter is 5.0 mm and the second lead-through wire diameter is 7.0 mm, the tensile strength is only about It can reach about 200 kgw. Although it can be used normally, there is still room for further strengthening.

The main purpose of this creation is to provide a wire and a threader that can provide different physical properties in the axial direction and have high tensile strength.

In order to achieve the above and other objects, the present invention provides a wire rod having a wire diameter at a first position greater than a wire diameter at a second position of the wire rod, the wire rod including at least two helically twisted spirals, At least one of the spirals is a continuous lead-through wire with no break point and the wire diameter at the first position is larger than the wire diameter at the second position.

In order to achieve the above and other objects, the present invention provides a threader, which includes the wire as described above, and further includes a cable holder disposed at one end of the wire.

In the present invention, at least one of the spirally twisted spirals has different wire diameters at different positions in the axial direction, but the structure is continuous without break points. It is found that the tensile strength of this design can be significantly improved. Moreover, different positions of the wire can also have different flexibility, which can meet the increasingly stringent wire threading requirements.

Please refer to FIG. 1 and FIG. 2, the drawing is the first embodiment of the present invention, the wire 100 has three spirals 110, 120, 130 spirally twisted with each other, and the three spirals 110, 120, 130 are continuous without Breakthrough of the lead wire, wherein the wire diameter of the screw 110 at the first position P1 is greater than its wire diameter at the second position P2, and the wires 120, 130 have a uniform wire diameter in the axial direction, so when three strands of wire After 110, 120, and 130 are helically twisted, the wire 100 will have a larger wire diameter D1 at the first position P1, and a smaller wire diameter D2 at the second position P2, and the wire diameter of the wire will be from the first position P1 toward The second position P2 gradually becomes smaller. Therefore, the section adjacent to the first position P1 of the wire 100 has better tensile strength, and the section adjacent to the second position P2 has better flexibility. Such physical characteristics make the wire 100 of this embodiment easy to wear Long and tortuous piping.

These spirals 110, 120, and 130 can be made of resin materials. Alternative resin materials include but are not limited to polyester resins, polyolefin resins such as PP and PE, and polyamide resins such as PA and their Copolymers, these resin materials are made into spirals by extrusion molding; during the extrusion molding process, the die diameter of the extrusion molding machine can be gradually changed to make the spiral 110 as shown in Figure 1 , That is, the wire diameter of the spiral 110 can gradually decrease from the first position to the second position; relatively, during the extrusion molding process, the die diameter of the extrusion molding machine maintains a fixed value, then the 1 spirals 120 and 130 shown in the figure. The spirals 110, 120, and 130 generally have good compressive and tensile strength, and have the ability to bend in the radial direction. Preferably, after the external force disappears, they have the potential to return to their original positions and conditions.

It should be noted that the diameter of the wire with a change in the axial direction may not only have one strand. For example, in the second embodiment of the present invention shown in FIGS. 3 and 4, the wire 200 has three strands of helically twisted spirals The wires 210, 220, 230 and the three spirals 210, 220, and 230 are continuous lead wires without breaks, and the diameter of the three strands 210, 220, and 230 in the first position P1 is larger than that in the second position P2 Therefore, the wire 200 has a larger wire diameter D1 at the first position P1 and a smaller wire diameter D2 at the second position P2.

In the foregoing embodiment, the first position P1 is located at one end of the wire, and the second position P2 is located at the other end of the wire, so that the wire diameter at one end of the wire is greater than the other end, but the change in wire diameter is not limited to this, for example In the third embodiment of the present invention shown in FIGS. 5 and 6, the wire 300 has three spirals 310, 320, and 330 that are spirally twisted with each other. The three spirals 310, 320, and 330 are all continuous without breaks. Lead wire, and the wire diameter of the spiral 310 at the first position P1 is larger than that at the second and third positions P2 and P3, wherein the first position P1 is located between the second and third positions P2 and P3, and the first The second and third positions P2 and P3 are located at the two ends of the wire 300 respectively. When the three strands 310, 320 and 330 are twisted in a spiral, the wire 300 will have a larger wire diameter D1 at the first position P1 and the Second and third positions P2 and P3 have smaller wire diameters D2 and D3, respectively. In this way, the section of the wire 300 adjacent to the first position P1 has better tensile strength, and the section adjacent to the second and third positions P2, P3 has better flexibility. Such physical characteristics make this embodiment Both ends of the wire 300 have good flexibility, and both ends can be used as the leading end during the pipe-through operation, and when the two ends are alternately used as the leading end, it also helps to extend the service life of the wire.

Please refer to FIG. 7, the two ends of the wire 400 may be provided with cable holders 410, 420 as a threader, the cable holders 410, 420 may be used to connect cables, and the form of the cable holders 410, 420 Can be the same or different.

It should be noted that the wire of the present invention can be used in addition to the aforementioned threader. Other possible uses include but are not limited to removing or detecting foreign objects in narrow channels. In this case, the cable holder is not necessary and can be omitted. In addition, the wire diameter of the wire does not necessarily change "continuously" from the first position to the second position. For example, the wire diameter of one of the wire sections between the first position and the second position gradually changes, but in the first and second positions The wire diameter of the other wire sections between the two positions remains unchanged; the number of wire strands is not necessarily three strands, as long as there are more than two strands.

With the foregoing design, the wire of the present invention has no breakpoints in structure, the tensile strength can be greatly improved, and the different positions of the wire also have different flexibility, which can meet the increasingly stringent wire pipe requirements.

100, 200, 300, 400 ‧‧‧ wire 110, 120, 130, 210, 220, 230, 310, 320, 330 ‧‧‧ spiral 410, 420‧‧‧ cable holder P1‧‧‧First position P2‧‧‧Second position P3‧‧‧ third position D1, D2, D3 ‧‧‧ wire diameter

Fig. 1 is an exploded view of the first embodiment of the present invention, showing the state before the three-ply spiral spiral is twisted.

Fig. 2 is a side view of the first embodiment of the invention.

Fig. 3 is an exploded view of the second embodiment of the present invention, showing the state before the three-ply spiral spiral is twisted.

Fig. 4 is a side view of a second embodiment of the invention.

Fig. 5 is an exploded view of the third embodiment of the present invention, showing the state before the three-ply spiral is twisted.

Fig. 6 is a side view of a third embodiment of the invention.

Fig. 7 is a side view of a fourth embodiment of the invention.

100‧‧‧Wire

110, 120, 130 ‧‧‧ spiral

P1‧‧‧First position

P2‧‧‧Second position

D1, D2‧‧‧ Wire diameter

Claims (7)

A wire, characterized in that the wire diameter at a first position is greater than the wire diameter at a second position, the wire comprises at least two spirals twisted with each other, at least one of the spirals The latter is a continuous lead wire without breakpoints, and the wire diameter at the first position is larger than the wire diameter at the second position. The wire rod according to claim 1, wherein the first position is at one end of the wire rod, and the second position is at the other end of the wire rod. The wire rod according to claim 1, wherein the wire diameter of the wire rod gradually decreases from the first position toward the second position. The wire rod according to claim 1, wherein the wire diameter of the wire rod at the first position is greater than the wire diameter of the wire rod at the third position, the first position is between the second and third positions, and the At least one of the spirals is a continuous lead-through wire, and the wire diameter at the first position is greater than the wire diameter at the second position and the wire diameter at the third position. The wire rod according to claim 1, wherein at least one of the spiral wires is a continuous lead-through wire without breakpoints and has a uniform wire diameter in the axial direction. The wire rod according to claim 1, wherein the spiral system is made of a resin material. A threader includes the wire as described in any one of claims 1 to 6, and further includes a cable holder provided at one end of the wire.

Images