FIELD OF INVENTION

This invention relates to circular chain saws and more particularly to improved circular chain saws for cutting hard materials such as concrete and reinforced concrete, bricks, stone and building materials, including chains that can be replaced on site.

BACKGROUND OF THE INVENTION AND PRIOR ART

A power saw, such as a concrete cutting diamond saw blade, has several concerns, whereas one of the main concerns is the durability of the cutting elements. Concrete cutting blades are typically high power saws, which endure high cutting resistance whereby the cutting element endure high deterioration rate due to abrasion. Concrete cutting generates a vast amount of wear due to the grinding process and the heat and abrasive dust generated. Typically, after deterioration of the diamond based cutting elements the whole blade is replaced. Concrete cutting diamond saw blades, which are commonly used in the field, have typically diamond based cutting elements. Figure 1 and Figure 2 illustrate prior art circular saw blades 20 and 30, respectively, for cutting hard materials, such as stone, concrete and reinforced concrete. Circular saw blade 20 and 30 include a main body core 22/32, a central bore 21 /31 with respect to an axis of rotation, a plurality of teeth 24/34 extending outwardly from the circumference of plate 22/32 and diamond impregnated elements 26/36 attached onto the external surface 28/38 of each tooth 24/34. Diamond impregnated elements 26/36 serves as the cutting elements. Typically, the core (22 /32) of a saw blade can be reused for several replacements of the diamond impregnated elements 26/36, until core 22 /32 is being damaged due to wear, crack formation or deformation.

In both cutting blades 20 and 30, once respective diamond impregnated elements 26 and 36 are worn out, cutting blades 20 and 30 can be taken to a service shop to be replaced with new diamond impregnated elements 26 and 36, either by silver blazing or laser welding. The replacement procedure is expensive both in money and time spend. Replacement of the whole cutti ng blade 20 and 30 is expensive as well.

There are also prior art circular saw blades with chains, designated to cut wood and other relatively soft materials, and is not suitable to cut hard and abrasives materials such as concrete and reinforced concrete, bricks, stone and building materials. US patent 5 ,048,389, given to Raymond Carlton, providi ng a cutting chain having links therein, including anchor links and cutter links. Each anchor link has an anchor portion which extends to one side of the chain. Opposed side links join the anchor links. Certain of the side l inks are cutter links. A disc having alternating sprocket teeth and gullies extending about the periphery thereof is provided. The chain is secured about the periphery of the disc with the anchor portions received i n the gullies. Side links in the chain straddle the sprocket teeth and serve to hold the chain from lateral displacement on the disc. An aspect of the present invention is to introduce a chain saw, preferably a diamond chain saw, or any other hard and durable element which comprises two novel and significant steps to overcome above disadvantages, by providing circular chain saws for cutting hard materials such as concrete and reinforced concrete, bricks, stone and building materials, including chains carrying the diamond or any other hard and durable impregnated elements, which elements can be replaced on site in a simple procedure.

The term "segment" as used herein refers to cutting segments, such as diamond or any other hard and durable impregnated elements, rigidly affixed (typically laser welded) to a pair of chain links, being a part of a chain for a power circular chain saw.

The terms "disc" and "blade" are used herein interchangeably.

There are also prior art milling/grinding tools in which the circular saw blades are concatenated side-by-side to form a powerful grinding tool to grind hard surfaces of stones, floors, concrete, asphalt and the like. Reference is made to Figure 1 3, which illustrates a milling roller 40 for a milling machine. Milling roller 40 is formed from side-by-side concatenation of circular saw blades, whereas the individual saw blades are similar in structure and operation to cutting blades 20 and 30.

Typically, milling roller 40 includes a main body core 42, a central bore 41 with respect to an axis of rotation, a plurality of diamond or any other hard and durable impregnated elements 46 attached onto the circumferential surface 48 of core 42. Diamond or any other hard and durable impregnated elements 46 serve as the cutting elements. Typically, core 42 can be reused for several replacements of the diamond or any other hard and durable impregnated elements 46, until core 42 is being damaged due to wear, crack formation or deformation.

An aspect of the present invention is to introduce a milling roller, preferably a diamond milling roller, or any other hard and durable milling roller which overcomes the above disadvantages, by providing a milling roller for grinding surfaces of hard materials such as concrete and reinforced concrete, stone, asphalt and building materials. The rollers including chains carrying the diamond or any other hard and durable impregnated elements that can be replaced on site in a simple procedure.

SUMMARY OF THE INVENTION

The principal intentions of the present invention include providing a circular saw blade with chain for cutting hard materials such as concrete and reinforced concrete. Once the segments are worn off, the chain can be replaced on site in a simple procedure, using the same core.

According to the teachings of the present invention there is provided a circular saw blade with a diamond chain for cutting hard materials such as concrete cutting and reinforced concrete. The circular saw blade of the present invention includes: (a) a disc like core body having alternating sprocket teeth and gullies extending about the circumference thereof; and (b) a chain having pairs of interconnected links secured about the circumference of the disc. Diamond or any other hard and durable impregnated segments are affixed onto the circumferential surface of the pairs of links, typically, with no limitations on other affixing procedures, by laser welding.

The pairs of links in the chain straddle the sprocket teeth and serve to hold the chain from lateral displacement on the disc. To harness the chain onto the disc circumference, an open chain is cut to fit the disc dimensions; the cut chain is wrapped about the disc circumference, wherein each pair of links is coupled with a sprocket; and closing the two open ends of the chain by a locking pin, a rivet or any other method (hereinafter referred to as "rivet").

The circular saw with chain of the present invention exhibit some major advantages:

1 . Ability to replace the chain in the field, on site, in a few minutes with no need to send to a service shop.

2. Reusing the circular blade both for wet and dry cutting procedures.

3. Ability to produce saws in any diameter, including in stone production lines, without having to halt production line for a lengthy period of time.

4. Circular saws with chains are quieter than circular saw blades.

5. Logistics and economic advantage: no need to store a variety of saw blade of different sizes - a single long open chain replaces them all. It should be noted that the term "diamond chain" as used herein refers to a chain including "segments", that are diamond impregnated elements, but not limited to diamond impregnated elements, and any other hard and durable elements can be used.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become fully understood from the detailed description given herein below and the accompanying drawings, which are given by way of illustration and example only and thus not limitative of the present invention, and wherein:

FIG. 1 (prior art) illustrates a prior art concrete cutting saw blade;

FIG. 2 (prior art) illustrates another prior art concrete cutting circular saw blade;

FIG. 3 illustrates a circular saw with a diamond chain, according to some embodiments of the present invention;

FIG. 4a illustrates a portion of the chain of a circular saw with a diamond chain, as shown in Figure 3, including cross section AA';

FIG. 4b illustrates a portion of the circular disc with sprockets, to be used with the diamond chain shown in Figure 4a, including cross section BB';

FIG. 4c illustrates the portion of the chain shown in Figure 4a, assembled onto the portion of the circular disc with sprockets, shown in Figure 4b, including cross section CC; FIG. 5 is a perspective view illustration of a portion of an assembled circular saw with a diamond chain, as shown in Figure 3;

FIG. 6 illustrates circular saw with a diamond chain, according to other embodiments of the present invention;

FIG. 7a illustrates a portion of the chain of a circular saw with a diamond chain, as shown in Figure 6, including cross section DD';

FIG. 7b illustrates a portion of the circular disc with sprockets, to be used with the diamond chain shown in Figure 7a, including cross section EE';

FIG. 7c illustrates the portion of the chain shown in Figure 7a, assembled onto the portion of the circular disc with sprockets, shown in Figure 7b, including cross section FF';

FIG. 8 illustrates the circular disc of the saw with a diamond chain, a portion of which is shown in Figure 7b;

FIG. 9 is a perspective view of the window G as shown in Figure 8;

FIG. 1 0a shows the operative positioning of a sprocket with respect to the corresponding carrying link and adjacent driving links, in the circular saw with a diamond chain as shown in Figure 7c, the front link being removed for illustrative purposes only;

FIG. 1 0b is a partially perspective side view illustration of the chain shown in Figure 7c, with a segment carrying link and driving link removed for illustration purposes only, the front link shown as being transparent, for illustrative purposes only; FIG. 1 1 a shows the operative positioning of a sprocket with respect to the corresponding carrying link and adjacent driving links, in the circular saw with a diamond chain as shown in Figure 7c;

FIG. l i b is a partially perspective side view illustration of the chain shown in Figure 7c, with a segment carrying link removed for illustration purposes only;

FIG. 1 1 c is a partially perspective side view illustration of the chain shown in Figure 7b, just before closing the chain over the disc;

FIG. l i d is a partially perspective side view illustration of the chain shown in Figure 7c, assembled onto the disc;

FIG. 1 2 is a perspective view illustration of a portion of an assembled circular saw with a diamond chain, according to embodiments of the present invention;

FIG. 1 3 (prior art) illustrates a prior art concrete milling roller;

FIG. 1 4 illustrates a milling roller with a diamond chain, according to embodiments of the present invention;

FIG. 1 5 is a perspective view illustration of the body core of the milling roller with diamond chain, as shown in Figure 1 4;

FIG. 1 6 is a front view, partial cross section HH' illustration of the body core of the milling roller with diamond chain, as shown in Figure 1 5 ;

FIG. 1 6a is a front view, partial cross section HH' illustration of the body core of the milling roller with diamond chain where a spiral groove is formed on the circumferential surface of core from which two chains are extended, one wrapped rightward to right spiral, its connecting point located on one point on the middle of the circumferential surface of core, whereas the second chain is wrapped leftward to left spiral,

FIG. 1 7 is a side view, partial cross section illustration of the milling roller with diamond chain, as shown in Figure 1 4;

FIG. 1 7a is a side view, partial cross section illustration of the milling roller with diamond chain where few additional springs are added on the circumferential surface of core, for keeping the chain constantly stretched.

FIG. 1 8 is a front view, partial cross section illustration of the milling roller with diamond chain, as shown in Figure 1 4;

FIG. 1 9 is a detailed enlargement of the window M, as shown in Figure 1 8;

FIG. 20 is a detailed enlargement of the window N, as shown in Figure 1 4;

FIG. 21 is a front view, partial cross section illustration of the milling roller with diamond chain, according to embodiments of the present invention, having a cone-like profile; and

FIGs. 22a-22d are front view, partial cross section illustrations of profiling milling rollers with diamond chain, according to embodiments of the present invention, each having a different non-linear profile. DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided, so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art, to which this invention belongs. The methods and examples provided herein are illustrative only and not intended to be limiting.

By way of introduction, the principal intentions of the present invention include providing a circular saw blade with chain for cutting hard materials such as concrete cutting and reinforced concrete. Upon wearing of the cutting segments, the chain can be replaced on site in a simple procedure.

Reference is now made to the drawings. Figure 3 illustrates circular saw with chain 1 00, according to embodiments of the present invention. Circular saw with chain 1 00 includes a disc 1 1 0 and a chain 1 20. Circular disc 1 1 0 includes a central bore 1 1 8, operatively designed to provide an axis of rotation to circular saw 1 00, formed substantially at the center of disc 1 1 0.

Reference is also now made to Figure 4a, which illustrates a portion of chain 1 20 of a circular saw 1 00, according to embodiments of the present invention, including cross section AA'. Reference is also now made to Figure 4b, which illustrates a portion of circular disc 1 1 0 with sprockets 1 1 4 of a circular saw 1 00, according to embodiments of the present invention, including cross section BB'. Reference is also now made to Figure 4c, which illustrates a portion of chain 1 20 assembled onto the portion of the circular disc 1 1 0 with sprockets 1 1 4, according to embodiments of the present invention, including cross section CC.

Circular disc 1 1 0 includes disc like body 1 1 2 having alternating sprocket teeth 1 1 4 and gullies 1 1 5 extending about the circumference thereof. Typically, circular disc 1 1 0 is made of abrasion enduring materials, for example metals such as low-medium carbon steel (0.3-0.8 %C) heat treated and hardened to 30-45 HRc.

Chain 1 20 of a circular saw 1 00 includes segment carrying links 1 22 and driving links 1 30. Each carrying link 1 22 includes two symmetrical links 1 22a and 1 22b pivotely joint on each end to a driving links 1 30 by a rivet 1 26. Driving link 1 30 is shape to allow pivotal motion with respect to a joint chain link 1 22. Driving link 1 30 further includes a driving tooth 1 34, fittingly shaped to be fittingly retained inside a corresponding gully 1 1 5. Driving tooth 1 34 extends towards the axis of rotation of circular disc 1 1 0, when operatively assembled. Each pair of carrying links 1 22 forms a gap between links 1 22a and 1 22b, sized by the width of driving links 1 30 pivotely attached thereto, one driving link 1 30 at each end of carrying links 1 22.

Tip portion 1 1 6 of circular disc 1 1 0 is narrowed with respect to width w of body 1 1 2, thereby forming a retaining seat 1 1 7 for internal edges 1 25 of carrying links 1 22 (see section CC in Figure 4c). Figure 5 is a perspective view illustration of a portion of an assembled circular saw 1 00. When operatively assembled, tip portion 1 1 6 is disposed inside the gap formed between links 1 22a and 1 22b, whereas internal edges 1 25 of carrying links 1 22 are seated on retaining seat 1 1 7, and driving tooth 1 34 is fittingly disposed inside a corresponding gully 1 1 5.

Each pair of carrying links 1 22 has a segment 1 28 affixed to external edges 1 23, preferably laser welded thereto.

Reference is now made to Figure 6, which illustrates circular saw with chain 200, according to embodiments of the present invention. Circular saw with chain 200 includes a disc 21 0 and a chain 220. Circular disc 21 0 includes a central bore 21 8, operatively designed to provide an axis of rotation to circular saw 200, formed substantially at the center of disc 21 0.

Reference is also now made to Figure 7a, wh ich illustrates a portion of chain 220 of a circular saw 200, according to embodiments of the present invention, including cross section DD'. Reference is also now made to Figure 7b, which illustrates a portion of circular disc 21 0 with sprockets 21 4 of a circular saw 200, according to embodiments of the present invention, including cross section EE'. Reference is also now made to Figure 7c, which illustrates a portion of chain 220 assembled onto the portion of the circular disc 21 0 with sprockets 21 4, according to embodiments of the present invention, including cross section FF'.

Circular disc 21 0 includes disc like body 21 2 having alternating sprocket teeth 21 4 and gullies 21 5 extending about the circumference thereof. Typically, ci rcular disc 21 0 is made of abrasion enduri ng materials, for exam ple metals such as low-medium carbon steel (0.3-0.8 C) heat treated and hardened to 30-45 HRc.

Chain 220 of a circular saw 200 includes segment carrying links 222 and driving links 230. Each carrying link 222 includes two symmetrical links 222a and 222b pivoteiy joint on each end to a driving link 230 by a rivet 226. Driving link 230 is shape to allow pivotal motion with respect to a joint chain link 222. Driving link 230 fu rther includes a driving tooth 234, fittingly shaped to be fittingly retained inside a corresponding gully 21 5. Driving tooth 234 extends towards the axis of rotation of circular disc 21 0, when operatively assembled. Each pair of carrying links 222 forms a gap between links 222a and 222b, sized by the width of driving links 230 pivoteiy attached thereto, one driving link 230 at each end of carrying links 222.

Reference is also now made to Figure 8, which illustrates circular disc 21 0, and to Figu re 9, which is a perspective view of window C as shown in Figure 8. Tip portion 21 6 of circular disc 21 0 is narrowed with respect to width w of body 21 2, thereby forming a retaining seat 21 7 for internal edges 225 of carrying links 222 (see section FF' in Figure 7c). when operatively assembled (see Figure 7c), tip portion 21 6 is disposed inside the gap formed between links 222a and 222b, whereas internal edges 225 of carrying links 222 are seated on retaining seat 21 7, and driving tooth 234 is fittingly disposed inside a corresponding gully 21 5.

Referring is also to Figure 1 0a, which shows the operative positioning of sprocket 21 4 with respect to the corresponding carrying link 222 and adjacent d rivi ng links 230, whereas front link 222a is removed for illustrative purposes only. Referring is also to Figure 1 0b, which shows the operative positioning of sprocket 21 4 with respect to the corresponding carrying link 222 and adjacent driving links 230, whereas front link 222a is shown as being transparent, for illustrative pu rposes only. The profile of sprocket 21 4 with respect to the space formed between links 222a and 222b provides continuing cutting stability of chain 220.

Each pair of carrying links 222 has a segment 228 affixed to external edges 223, preferably laser welded thereto.

It should be noted that tip portion 21 6 are wider than tip portion 1 1 6, thereby increasi ng the cutting stability of circular saw 200 compared with circular saw 1 00. Furthermore, tip portion 21 6 is higher than tip portion 1 1 6, and retaining seat 21 7 is wider than retaining seat 1 1 7, thereby further increasing the cutting stability of circu lar saw 200 compared with circular saw 1 00.

It should be further noted that carrying links 222 are longer than carrying lin ks 1 22, facilitati ng attachment of cutting segments 21 8 with longer cutting surfaces, compared with cutting segments 1 1 8. Furthermore, the total accumulated gaps between segments 21 8, is significantly smaller than the total accumulated gaps between cutting segments 1 1 8. Thereby, the cutting surface of circular saw 200 is significantly longer compared with the cutting surface of circular saw 1 00.

Reference is also now made to: Figure 1 l a, which is a partially perspective side view illustration of chain 220, with a segment carrying link 222 and a driving link 230 removed for illustration purposes only; Figure l i b, which is a partially perspective side view illustration of chain 220, with a segment carrying link 222 removed for illustration purposes only; Figure 1 l c, which is a partially perspective side view illustration of chain 220, just before closing chain 220 over disc 21 0; Figure l i d, which is a partially perspective side view illustration of chain 220, assembled onto disc 21 0; and Figure 1 2, which is a perspective view illustration of a portion of an assembled circular saw with chain 200, according to embodiments of the present invention.

A shown in Figures 1 0 and 1 0b 9, the operative positioning of sprocket 21 4 with respect to the corresponding carrying link 222 and adjacent driving links 230, is also shown in Figures 1 1 a and l i b. Also shown are the bores in carrying links 222 and driving links 230. Corresponding carrying link 222 and driving link 230 are interconnected by a rivet 260 inserted and fixed through corresponding bores 224 in a pair of carrying links 222 and bore 232 in respective driving link 230. Figure 1 1 c shows the ends of chain 220 in place, just before interconnecting by inserting and fixing a rivet through bore 224. Figure l i d shows chain 220 in place, after interconnecting by rivet 260.

Referring back to Figures 7a, 7b and 7c, an aspect of the present invention for further increasing the cutting stability of circular saw with chain 200, according, is shown. In the embodiment previously described, edges 223 and 225 of carrying link 222 are assumed to be substantially parallel. In preferred variations of the present invention, edges 223 and 225 of carrying link 222 are not parallel. External edge 223 is substantially perpendicular to the virtual radius line connecting disc bore 21 8 (see Figure 8) and axis 229 of carrying link 222. It is taken that rotational direction 205 defines direction 205 as a forward direction. Internal edge 225 is forwardly slopped, with respect to external edge 223, by a predesigned angle . Hence, the forward side of a link 222 is wider than the rear side of carrying link 222. Retaining seats 21 7 of sprockets 21 4 are fittingly slopped (see Figure 7b), whereby the surface of a retaining seat 21 7 is operatively substantially parallel to a corresponding edge 225 of the coupled carrying lin k 222.

The aforesaid non-parallel structure of carrying links 222 and fittingly sloped retaining seats 21 7 provides further cutting stability to circular saw with chain 200. The slop adds an additional driving factor to chain 220. When chain 220 grows in length due to wear, the slopes cause carrying li nks 222 of chain 220 to slip over the corresponding slopes of retaining seats 21 7, and thereby increasing the chain diameter, whereby straining the chain.

In variations of the present invention, the concept of non-parallel structure of carrying links 222 and fittingly sloped retaining seats 21 7, as embodied in chain 220 of circular saw with chain 200, can be embodied in other chains of power chain saws, including in a chain 1 20 of a circu lar saw 1 00.

Reference is now made to Figure 1 4, which illustrates a milling roller 300 with a diamond chain 320, according to embodiments of the present invention. Milling roller 300 includes a cylindrical body core 31 0 and a diamond chain 320.

Reference is also made to Figure 1 5, which is a perspective view illustration of body core 31 0, and to Figure 1 6, which is a front view, partial cross section HH' illustration of body core 31 0. Body core 31 0 includes a cylindrical hollow space 31 8 formed substantially symmetric about rotational axis 305, whereas hollow space 31 8 is used to securely mounting milling roller 300 onto a rotating mechanism.

Reference is also made to Figure 1 7, which is a side view, partial cross section illustration of assembled milling roller 300 with diamond chain 320; to Figure 1 8, which is a front view, partial cross section illustration of assembled milling roller 300 with diamond chain 320; to Figure 1 9, which is a detailed enlargement of window M, as shown in Figure 1 8; and to Figure 20, which is a detailed

enlargement of the window N, as shown in Figure 1 4.

Spiral groove 340 is formed on the circumferential surface 350 of core 31 0 preferably extending from one end side of core 31 0 to the other end side of core 31 0. Groove 340 is designed to fittingly retain diamond chain 320. When assembled, diamond chain 320 extends from one end side of core 31 0 to the other end side of core 31 0. Body core 31 0 further includes an attaching mechanism 360, disposed on both end sides of core 31 0 proximal to the beginning and end of groove 340, for securely affixing diamond chain 320 to body core 31 0. For example, attaching mechanism 360 includes a chain holding bolt 362 and a fitted hollow threaded cavity 31 6 (see Figure 1 5) formed on the side of body core 31 0. In variations of the present invention, as described in Figure 1 7a, For stretching the chain, 2 additional springs 380 are added on the circumferential surface 350 of core 31 0 for keeping the chain constantly stretched and no further manual stretch needed. Each spring is supported by fixing pin 381 . In variations of the present invention, as described in Figu re 1 6a, 2 Spiral grooves 340-L and 340-R are formed on the circu mferential surfaces 350-L and 350-R of core 31 0 preferably extending from the middle of core 31 0 to both sides of core 31 0. Two chains can be extended from the circu mferential surface 350 of core 31 0, one wrapped rightward to right spiral mounted on grove 340-R its connecting point located on the upper side of the circu mferential surface of core 390a, whereas the second chain can be wrapped leftward to left spiral mou nted on grove 340-L its connecting point located on the lower side of the circu mferential surface of core 390b.

Diamond chain 320, as illustrated in the drawi ngs, is shown by way of example only, and other chains the like can be used, including diamond chains 320 and 220. Diamond chain 320 includes segment carrying links 322 and driving links 330. Each carrying link 322 includes two symmetrical links 322a and 322b (see Figure 1 9) pivotely joint on each end to a driving links 330 by a rivet 326. Driving link 330 is shaped to allow pivotal motion with respect to a joint chain link 322. Driving link 330 further includes a driving tooth 334, fittingly shaped to be fittingly retained inside groove 340. Driving tooth 334 extends towards axis of rotation 305 (in direction 306) of core 31 0, when operatively assembled. Each pai r of carrying li nks 322 has a segment 328 affixed to the external edges of carrying links 322, preferably laser welded thereto.

Preferably, milling roller 300 includes a tightening mechanism, for tightening diamond chain 320 onto body core 31 0, inside groove 340. For example, milling roller 300 with a diamond chain 320 further includes straining an nuluses 370a and 370b fittingly disposed on both sides of body core 31 0 and securely attached to body core 31 0 with bolts 31 4. Straining annuluses 370 includes concentric slots 31 2, fittingly formed to accommodate corresponding bolts 31 4. The first and last links 327 of chain 320 are connect at one end to the nearest adjacent link 322 by a driving link 330. At the other open end of the first and last links 327, a threaded bore 329 is formed. Threaded bore 329 is fitted to the threads of chain holding bolt 362. When assembled, chain holding bolt 362 is screwed through bore 364 (see Figure 1 9), then through bore 329 of the pair of first and last links 327, and then through threaded cavity 31 6.

When tightening of diamond chain 320 is needed, bolts 31 4 are untied and straining annuluses 370 is turned with respect to body core 31 0, in direction 308, (see Figure 1 7) u ntil diamond chain 320 is properly strained. Bolts 31 4 are then tightened again to preserve the relative positioning of each straining annulus 370 with respect to body core 31 0. Reference is now made to Figure 21 , which illustrates a milling roller 400 with a diamond chain 420, according to embodiments of the present invention, having a cone-like profile. Milling roller 400 includes a cone-like body core 41 0 and a diamond chain 420. Generally, milling roller 400 is similar in structure to milling roller 300, except that body core 31 0 has a cylindrical form and body core 41 0 has a cone-like form. Hence, a hard material 1 0, being grinded by milling roller 400 with a diamond chain 420, obtains a form having a slope 1 2 corresponding to the slope of cone-like body core 41 0. It should be noted that Figure 2 1 further illustrates an example attaching mechanism 41 8 for attaching milling roller 400 to a rotating motor. Similar attaching mechanism can be u sed by all embodiments of the present invention. Reference is now made to Figures 22a-22d, which illustrate body cores

51 0a-5 1 0d of respective profi ling milling rollers with a diamond chain, according to embodiments of the present invention, wherein each of the body cores 51 0a- 51 0d has a different non-linear profile. Hence, a hard material 1 0, being grinded by a profiling milling roller with a diamond chain, employing respective body cores 51 0a-5 1 Od, obtains a form having a profile 1 2 corresponding to the profile of the respective body cores 51 0a-51 0d.

In variation of the present invention, milling rollers 300, 400 and 500 include more than one spiral groove.

The invention being thus described i n terms of several embodiments and examples, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art.