Background Art As generally known in the art, various methods have been utilized in absorbing vibration of a saw for cutting stone, concrete, asphalt, tile, lumber, refractory material, etc.

For example, in conventional saws capable of cutting an object simultaneously while absorbing vibration as shown in FIGs. 1A and 1B, grooves 12 having various shapes are formed outside of an assembling hole 11.

That is, in the conventional saws as described above, the grooves 12 intercept the vibration generated when various materials are cut by cutting tips 130 provided at the conventional saws 10.

Further, in another conventional saw shown in FIG.

1C, a copper plate C is interposed between two saw bodies 100, so that the saw has a sandwich form, which

can reduce the noise by the cutting vibration.

However, in the case of the conventional saw shown in FIG. 1C, the saw bodies laminated in the sandwich form may be separated from the copper plate by the cutting vibration, so that the cutting tips or the saw bodies may be broken.

Further, the locally formed grooves can partially intercept the cutting vibration but cannot intercept the vibration generated over the entire saw, so that generation of metallic noise cannot be completely prevented.

Moreover, the noise as described above makes it nearly impossible to perform the cutting work by the conventional saws in the nighttime. Even when the cutting work is urgently carried out due to some unavoidable circumstances, the noise as described above may provoke enmity of people and cause civil appeals to stop the cutting work, thereby disturbing further progress of a construction work requiring the cutting work.

Disclosure of the Invention Therefore, the present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an anti-noise saw equipped with vibration-proof material, in which at least a vibration-proof member is integrated with a saw body or between two saw bodies, so that the vibration- proof member can absorb vibration generated from cutting tips, thereby originally intercepting generation of noise.

It is another object of the present invention to provide an anti-noise saw equipped with vibration-proof

material, in which the noise can be originally intercepted, so that the cutting work can be carried out even in the nighttime and in a closed space, that is, the cutting work can be easily carried out regardless of the time and place, thereby providing reliability for workers.

It is another object of the present invention to provide an anti-noise saw equipped with vibration-proof material, in which a saw body made from metal is integrated with nonmetallic material in a good condition, so as to not only eliminate noise but also maximize the vibration-proof performance.

According to an aspect of the present invention, there is provided an anti-noise saw equipped with vibration-proof material, the anti-noise saw comprising: two saw bodies opposed to each other, each of which has an assembling hole formed at a center of each of the saw bodies, the assembling hole enabling the anti-noise saw to be assembled with a cutting apparatus for cutting stone, concrete, asphalt, tile, lumber, and refractory material, each of the saw bodies having at least a groove formed outside of the assembling hole on an inner surface of each of the saw bodies, the inner surfaces of the two saw bodies being opposed to each other, so that the grooves formed on the inner surfaces are opposed to each other; a plurality of cutting tips fixed to edges of cutting blades formed along the circumference of outer surfaces of the saw bodies ; and a vibration-proof member inserted between the two grooves, so as to absorb vibration generated from the cutting tips when cutting is carried out by the anti-noise saw.

Brief Description of the Drawings The foregoing and other objects, features and advantages of the present invention will become more

apparent from the following detailed description when taken in conjunction with the accompanying drawings in which: FIGs. 1A to 1C are perspective and sectional views of a conventional saw for cutting stone or concrete having a vibration-proof member; FIG. 2A is an exploded perspective view of an anti-noise saw equipped with vibration-proof material according to an embodiment of the present invention ; FIG. 2B is a perspective view of the anti-noise saw of FIG. 2A in an assembled state ; FIGs. 3A to 3C are perspective views of various anti-noise saws equipped with vibration-proof material according to other embodiments of the present invention ; FIGs. 4A is a sectional view of the anti-noise saw of FIG. 2A, taken along line A-A in FIG. 2B; FIG. 4B is a sectional view of the anti-noise saw equipped with vibration-proof material according to another embodiment of the present invention, in which vibration-proof members are disposed in parallel ; FIGs. 5A and 5B are perspective views of anti- noise saws equipped with vibration-proof material according to other embodiments of the present invention, in which grooves having various shapes other than an annular shape are arranged around an assembling hole ; and FIGs. 6A and 6B are sectional views of the anti- noise saws equipped with vibration-proof material, taken along line B-B in FIG. 5A.

Best Mode for Carrying Out the Invention Hereinafter, several preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description and drawings, the same reference numerals are used to

designate the same or similar components, and so repetition of the description on the same or similar components will be omitted.

FIGs. 2A to 3C show the construction of an anti- noise saw 10 equipped with vibration-proof material according to an embodiment of the present invention. In the following description and drawings, the same elements as those in the conventional saw will be numbered and named the same.

As shown, the anti-noise saw 10 equipped with vibration-proof material according to the first embodiment of the present invention includes two saw bodies 100 opposed to each other, each of which has an assembling hole 11 formed at the center of each saw body 100. By means of the assembling holes 11, the anti-noise saw 10 can be assembled with a general cutting apparatus for cutting stone, concrete, asphalt, tile, lumber, refractory material, etc.

The saw bodies 100 have annular grooves 110 formed outside of the assembling holes 11 on inner surfaces of the saw bodies 100, which are opposed to each other, so that the grooves 110 are also opposed to each other.

Hereinafter, the construction of only one saw body 100 will be described, since the two saw bodies 100 have the same construction.

In the meantime, a vibration-proof member 200 is inserted between the two annular grooves 110, and the saw bodies 100 are placed one upon another in such a manner that the inner surfaces of the saw bodies 100 are in contact with each other, and then flat portions of

the inner surfaces other than the annular grooves 110 receiving the vibration-proof member 200 are fixedly attached to each other by a spot welding.

In this case, the spot welding is one of the known welding methods, in which, large current is applied to two welding preforms attached to each other, so that the two welding preforms are melted by heat generated due to contact resistance at the contact portion between the two preforms, and then the two melted preforms are pressed to each other by two electrodes disposed above and under the two preforms, so that they are fixedly attached to each other.

Moreover, a plurality of cutting segments or cutting tips 130 (hereinafter, referred to as"cutting tips") are fixed to edges of cutting blades 120 formed along the circumference of an outer surface of each saw body 100. The cutting tips 130 are tungsten carbide tools or tools for cutting diamond, which is made by properly mixing and then sintering diamond with metal powder. In attaching the cutting tips 130 to the edges of the cutting blades 120, the cutting tips 130 are placed at and then welded to the edges of the cutting blades 120. In this case, as a method for welding the cutting tips 130 to the edges of the cutting blades 120, various methods known in the art, such as silver soldering or brazing, and a laser welding, may be employed.

In the laser welding as mentioned above, the laser beam has characteristics of straightforwardness and indirectness and can be focused on a fine point, to

produce energy with a very high density on the point.

When the laser beam is shed on a material, the material is locally heated and melted, so that a melted portion of the material enables the laser welding.

In the laser welding, no separate welding flux such as a welding rod is necessary between two welding preforms, so that no slag or welding defect, which may be found in other welding method, is found.

Further, stone powder discharge holes 121 are formed at center portions of the cutting blades 120 to which the cutting tips 130 are attached, so as to prevent the cutting blades 120 of the saw body 100 from being worn off by chips or powder of concrete or asphalt produced when the concrete or asphalt is cut by the cutting tips 130.

That is, as shown in FIG. 2B, in the case where the saw performs the cutting while coming into a surface of a cutting subject such as stone and concrete, stone powder or chips of the cutting subject resulting from the cutting are firstly introduced into the stone powder discharge holes 121, and then the chips are discharged out of and spattered from the stone powder discharge holes 121 when the corresponding stone powder discharge hole 121 containing the chips comes out of the cutting subject. Therefore, both sides of the cutting blades 120 provided with the cutting tips 130 are prevented from being worn off by the chips.

Although each of the shown stone powder discharge holes 121 has a shape of an elongated hole, the saw of the present invention may employ various shapes for the

stone powder discharge holes 121. For example, each of the stone powder discharge holes 121 may have any shapes, including semi-ellipsoidal shape, a shape of a teardrop, etc., whose circumferential edge is necessarily open, so as to enable the chips introduced in the hole 121 to be discharged.

Further, the stone powder discharge holes 121 as described above may be employed not only in the anti- noise saw 10 provided with the vibration-proof member 200 according to the present invention but also in a usual saw having cutting blades attached along an edge of a thin metal plate, so as to prevent foreign material from being caught between the cutting blades.

Moreover, although only one groove 110 is formed on the inner surface of each saw body 100 according to the present embodiment as described above, more than one, for example two or three, annular grooves may be formed around the assembling hole 11 of each saw body 100, so as to maximize the vibration-proof performance.

Furthermore, instead of the annular grooves as described above, grooves 110 having various shapes as shown in FIGs. 3A to 4B may be formed on inner surfaces of the saw bodies 100, and the vibration-proof member 200 may be disposed in the grooves 110 between two saw bodies 100, so as to maximize the vibration-proof performance.

FIGs. 5A to 6B show anti-noise saws 10 equipped with vibration-proof material according to other embodiments of the present invention, in which the vibration-proof members 200 are not interposed between the saw bodies 100 but are disposed on both surfaces of a saw body 100. In more detailed description, in the anti-noise saw 10 of the present embodiments, annular

grooves 110 are formed on both surfaces of a saw body 100, and annular vibration-proof members 200 are put in and attached to the annular grooves 110 by means of an adhesive, so that the annular vibration-proof members 200 are integrated with the saw body 100, thereby absorbing the vibration of the saw body 100. In this case, the annular grooves 200 may be formed to communicate with each other, and vibration-proof members 200 may be filled and attached in the communicating annular grooves 200 as shown in FIGs. 6A and 6B.

Further, the vibration-proof members 200 may be made from any material other than metal, which is material of the saw body 100, including synthetic resin such as phenol polypropylene (PP), polyethylene (PE), polyvinyl chloride (PVC), polyurethane, and rubber, and powder of pulp, lumber, nonferrous metal, etc.

That is, in the case of the vibration-proof members made from resin and attached to both surfaces of the saw body, the vibration-proof members reduce noise and prevent metallic thundering noise which may be generated when the cutting tips 130 come into collision with hard material, such as stone, concrete, and asphalt, simultaneously while vibration is transferred through the saw body 100, when the hard material is cut by the cutting tips 130 attached to outer edges of the cutting blades 120 formed along the circumference the saw body 100.

Also, in the case of the vibration-proof members 200 made from material such as powder of nonferrous metal, pulp, and lumber, other than the synthetic resin as described above, the vibration-proof member 200 in a powder state is filled in the groove 100, and then the powder of the vibration-proof member 200 is cured after predetermined time passes, so as to be integrated with the saw body 100.

In the conventional saw 10, noise level due to the vibration as described above is at least about 100 dB, which has a fatal effect on the hearing ability of a user of the conventional saw 10 or people in the vicinity of the conventional saw 10. Therefore, it is recommended in consideration of industrial safety that a worker with such a saw should necessarily put on not only an inner earplug inserted in the ear but also an outer earplug covering over the ear.

However, in the anti-noise saw 10 equipped with vibration-proof material according to the present invention, the vibration-proof member 200 as described above originally prevents noise due to vibration, thereby not only preventing the worker's hearing ability from being damaged, but also enabling a construction work to be carried out even in a densely populated area such as a residential area, so as to facilitate the construction work.

Industrial Applicability In an anti-noise saw equipped with vibration-proof material according to the present invention, at least a vibration-proof member is integrated with a saw body or between two saw bodies, so that the vibration-proof member can absorb vibration generated from cutting tips, thereby originally intercepting generation of noise.

Further, since the noise can be originally intercepted as described above, the cutting work can be carried out even in the nighttime and in a closed space, that is, the cutting work can be easily carried out regardless of the time and place, so that work productivity is improved.

Moreover, in an anti-noise saw equipped with vibration-proof material according to the present invention, the saw body made from metal is integrated

with nonmetallic material in a good condition, so as to not only eliminate noise but also maximize the vibration-proof performance.

While this invention has been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments and the drawings, but, on the contrary, it is intended to cover various modifications and variations within the spirit and scope of the appended claims.