SPRING TYPE WIRE SAW

Technical Field

The present invention relates to a diamond wire saw, on which diamond is stuck, for cutting an object being cut by winding an wire on the object being cut and rotating the wire at high speed through a driving device to remove constructions, and more particularly, to a spring type wire saw, in which springs are fixed to both sides of a bead and the beads are fit to a wire in such a way that the facing springs are coupled with each other in a spiral direction, thereby providing excellent flexibility of the springs and a good coupling performance of a screw, simultaneously.

Background Art

Presently, there are a diamond wire saw method and a wheel saw method for removing constructions or various structures. Out of them, the diamond wire saw method has been mainly used. The wire saw method is used for maintenance or removal of constructions located in a densely built-up area, maintenance of industrial construction, which might suffer a great loss if its facilities are all discontinued, and extension work of construction, which is carried out in a limited space or demands a clean cut section. In addition, the wire saw method is used for maintenance or removal of a road or an express highway, which may cause inconvenience to citizens, such as a hindrance to surrounding environments or a traffic hindrance. Moreover, the wire saw method is used for removal or maintenance of constructions, such as schools,

hospitals, and telephone offices, which is restricted in work due to noise, vibration and dust. That is, the wire saw method covers a wide scope, for example, work fields demanding to minimize the damages of surrounding environments or work fields carried out in the restricted working environment.

In the meantime, FIG. 1 illustrates an example of a method of manufacturing a wire saw according to a prior art. As shown in FIG. 1, metallic shanks 110 are longitudinally mounted on the outer peripheral surface of a metallic wire 100 at regular intervals. The shank 110 has a number of screw threads 111 formed on the inner peripheral surface thereof, so that the shank 110 is fixed to the wire 100. The shank 110 and the wire 100 are fixed to each other by filling gaps between the screw threads 111 and the wire 100 with resin. Furthermore, a bead 130, which is made by sintering diamond and metallic powder, is coupled to the outer peripheral surface of the shank 110. Additionally, a bead supporting portion 120 injection-molded of urethane resin or rubber resin for surrounding the shank 110 is formed between the beads 130.

While the outer diameter of the wire saw, which is required in a prior art, is 1 to 1.1cm, the outer diameter of the wire conventionally used is generally 5mm, and the outer diameter of the shank is generally 8mm. So, since a thickness of the bead is manufactured relatively too thin, the wire saw has a short lifespan in comparison with the complicity in manufacturing and the price.

In addition, FIG. 2 illustrates a method of manufacturing an improved wire saw according to another prior art to overcome the above problem of the prior art. As shown in FIG.

2, to solve the problems of the prior art, a method of manufacturing an improved wire saw is provided. Referring to FIG. 2, beads 210 are directed fixed to a wire 200 without any shank, and a resin 220 is covered and injection-molded on the outer peripheral surface of the wire 220. The improved wire saw according to the prior art has an advantage in that the beads 210 can be manufactured thick. However it has a problem in that a screw portion for firmly fixing the wire 200 and the beads 210 with each other cannot be formed due to the high strength of the beads 210, and the wire 200 would be cut as the beads 210 are rotated on the wire 200 during the use.

Accordingly, a spring type wire saw is demanded which can provide a firm fixing force and flexibility, simultaneously, when the beads 210 are fixed to the wire 200.

Disclosure of Invention

Technical Problem

Accordingly, the present invention has been made in an effort to solve the above-mentioned problems occurring in the prior arts, and it is an object of the present invention to provide a spring type wire saw, which sufficiently provides necessary flexibility and fixing force for fixing beads to a wire. That is, it is the object of the present invention to provide a spring type wire saw, which is simple in manufacturing and provides excellent flexibility and fixing force.

Technical Solution

To achieve the above objects, in an aspect of the present invention, the present invention provides a spring type wire saw comprising: a wire formed in such a way that a number of steel wires are twisted; beads fixed on the wire at predetermined intervals and containing diamond; a first spring coupled to a side of the bead on the: wire and a second spring coupled to the other side of the bead; and a connecting means for connecting the first spring of the bead and the second spring of the adjacent bead with each other. In addition, the connecting means fits and connects the connected first and second springs with each other in a spiral direction. Moreover, the connecting means is an auxiliary spring having an end connected to a free end of the first spring and the other end connected to a free end of the adjacent second spring.

Furthermore, both ends of the auxiliary spring are fit to the springs in the spiral direction, and respectively connected to the first spring and the adjacent second spring.

Additionally, the outer peripheral surfaces of the first and second springs are covered with waterproof coating layers. It is preferable that the waterproof coating layer is as thick as the bead protrudes and is exposed to the outside.

In addition, the waterproof coating layer is made of urethane or rubber. Moreover, the waterproof coating layer is formed in a state where the first spring and the second spring are compressed and closely abut thereon. The first and second springs may have a round or rectangular section.

The above and other objects, features and advantages of the present invention will be apparent from the following

detailed description of the preferred embodiments of the invention in conjunction with the accompanying drawings.

Advantageous Effects

As described above, the spring type wire saw according to the present invention can sufficiently provide necessary flexibility and fixing force for fixing the beads to the wire. In addition, the beads can be firmly fixed to the wire due to the flexibility of the springs and the coupling of the springs and the beads .

So, the spring type wire saw according to the present invention can save manpower and prices to produce wire saws since the beads are easily coupled and firmly fixed to the wire through the springs. Moreover, the spring type wire saw according to the present invention is greatly increased in its lifespan since a performance of the product is improved.

Description of the Drawings

FIG. 1 is a sectional view showing an example of a wire saw according to a prior art .

FIG. 2 is a sectional view showing an example of a wire saw, which has no shank, according to another prior art. FIG. 3 is a side view showing coupling of springs of a spring type wire saw according to a first preferred embodiment of the present invention.

FIG. 4 is a side view showing coupling of springs using an auxiliary spring of a spring type wire saw according to a second preferred embodiment of the present invention.

FIG. 5 is a side view of a spring type wire saw according to a third preferred embodiment of the present invention.

[Explanation on reference numerals of main elements in drawings] 10: wire saw

11: first spring 12: second spring

13 : bead 14 : auxiliary spring

20: wire 30: waterproof coating layer

Mode for Invention

Reference will be now made in detail to the preferred embodiment of the present invention with reference to the attached drawings. [First Embodiment]

FIG. 3 is a side view showing coupling of a spring of a spring type wire saw according to a first preferred embodiment of the present invention. As shown in FIG. 3, in the drawing, the left part shows a completely coupled state, the middle part shows a state where coupling is going on, and the right part shows a state before coupling.

Referring to FIG. 3, a wire saw 10, which is used for cutting work to remove constructions and structures, is provided according to a first preferred embodiment of the present invention. The wire saw 10 has beads 13 which contain diamond of a predetermined amount and are coupled to a wire 20 of a predetermined length at regular intervals. Moreover, a first spring 11 and a second spring 12, which are constructed of a compression coil spring type, are fixed to both sides of

the bead 13. In addition, the wire 20 is formed in such a way that a number of steel wires are twisted.

A number of the beads 13 are fit on the wire 20, and the first spring 11 and the adjacent second spring 12, which abut on each other, are respectively rotated in a spiral direction to thereby completely couple them with one another. The bead 13 is in an annular or a hollow cylindrical form, and contains diamond particles. After that, the outer peripheral surfaces of the first and second springs 11 and 12 are coated with a waterproof coating layer 30. Here, the waterproof coating layer 30 may be made of urethane or rubber.

As described above, in the spring type wire saw 10, the first and second springs 11 and 12 are fixed to both sides of the bead 13 via welding or another fixing method. Then, the wire 20 is inserted into the inner surfaces of the first and second springs 11 and 12 in such a way as to pass through the center of the bead 13.

In this instance, as an example for another fixing method, female screw threads are formed at both sides of the bead 13 in such a way that the ends of the first and second springs 11 and 12 can be fit to the female screw threads. Then, the first and second springs 11 and 12 can be fit and coupled to the female screw threads, which are formed at both sides of the bead 13 by rotating the first and second springs 11 and 12. It would be appreciated that various methods for coupling the first and second springs 11 and 12 to the bead may exist besides the above, and those skilled an the art can select one of the various methods to easily carry out.

As described above, a number of the first and second springs 11 and 12 and a number of the beads 13 are fit on the

wire 20, and then, the first and second springs 11 and 12 and the beads 13 are rotated. Then, the ends of the first and second springs 11 and 12, which abut on each other, are fit and coupled into gaps of the springs 11 and 12 mutually in the spiral directions of the first and second springs 11 and 12.

As another method of manufacturing the spring type wire saw 10 according to the present invention, the first and second springs 11 and 12 and the beads 13 are separately assembled, and then, fit to the wire 20. To fix the first and second springs 11 and 12 with each other in a spiral coupling type, lengths of the springs 11 and 12 are equal with each other. After the first and second springs 11 and 12 are completely coupled with each other, a space formed between two adjacent beads 13 is compressed, so that the first and second springs 11 and 12 completely and closely contact with each other. Then, the wire 20 is covered with the first and second springs 11 and 12 and the beads 13, and so, is not exposed to the outside. After that, the waterproof coating layer 30 is coated on the covered wire 20. Finally, the wire 20 is not exposed to the outside due to the continuous coupling between the first and second springs 11 and 12. Furthermore, the beads 13 are also firmly fixed to the wire by virtue of the coupling between the first and second springs 11 and 12, and have excellent flexibility by elasticity of the springs. The above effects can be obtained likewise even when an auxiliary spring 14 is used, as shown in FIG. 4 illustrating a second preferred embodiment of the present invention.

In addition, since the surface of the spring is the waterproof coating layer 30, cooling water for cutting or

foreign matters, such as cutting oil, stone powder, and so on, do not enter into the wire 20. So, the wire saw can prevent abrasion of the wire 20 to thereby lengthen its lifespan. The waterproof coating layer 30 can be made of urethane or rubber as occasion demands, and it would be appreciated that those skilled in the art can change and modify the waterproof coating layer through one of various waterproof coating methods. Furthermore, the waterproof coating layer 30 is as thick as the bead 13 protrudes and is exposed outwardly a little or the waterproof coating layer 30 has the same height as the bead 13.

[Second Embodiment]

FIG. 4 is a side view of a spring type wire saw according to a second preferred embodiment of the present invention, showing a state where the auxiliary spring 14 is coupled to the spring type wire saw 10. In FIG. 4, the left part shows a completely coupled state, the middle part shows a state where coupling is going on, and the right part shows a state before coupling. As shown in FIG. 4, the auxiliary spring 14 is coupled between the first spring 11 fit to the wire 20 and the second spring 12 adjacent to the first spring 11. That is, the first spring 11 and the second spring 12 are respectively screw- coupled to both ends of the auxiliary spring 14, as shown in FIG. 3, .

In this instance, the first spring 11, the second spring 12 and the auxiliary spring 14 have: the same lead pitch and direction. So, when the first spring 11 and the second spring 12 are fit to the auxiliary spring 14, there is no gap between the springs. In this instance, ends of the first and second

springs 11 and 12 coincide with each other in such a way as not to form gaps among the ends of the first and second springs 11 and 12 and the beads 13.

When coupling between the first spring 11 and the auxiliary spring 14 and coupling between the second spring 12 and the auxiliary spring 14 are finished, the beads 13 are compressed. In the state where the springs 11, 12 and 14 are in close contact with one another, the waterproof coating layer 30 is formed. [Third Embodiment]

FIG. S is a side view of a spring type wire saw according to a third preferred embodiment of the present invention, showing coupling of springs. As shown in FIG. 5, the first spring 11 and the second spring 12 may have a rectangular or round section. A molding process of the waterproof coating layer 30 is the same as the first and second preferred embodiments described above.

Industrial Applicability

As described εibove, the spring type wire saw according to the present invention can sufficiently provide necessary flexibility and fixing force for fixing the beads to the wire. In addition, the beads can be firmly fixed to the wire due to flexibility of the springs and coupling of the springs to the beads .

So, the spring type wire saw according to the present invention can save manpower and prices to produce wire saws

since the beads are easily coupled and firmly fixed to the wire through the springs. Moreover, the spring type wire saw according to the present invention is greatly increased in its lifespan since a performance of the product is improved. While the present invention has been described with reference to the particular illustrative embodiments, it is not to be restricted by the embodiments but only by the appended claims. It is to be appreciated that those skilled in the art can change or modify the embodiments without departing from the scope and spirit of the present invention.