An electric cutter with water-cooled disk

The present invention relates to an electric cutter with water-cooled disk.

Cutting tables for tiles or the like above which a longitudinal horizontal guide is mounted are known as electric cutters; a carriage is mounted so that it can slide along the guide, and a motor assembly, which supports a cutting disk, is associated with said carriage so as to oscillate on a horizontal transverse axis.

Work with certain materials entails the use of disks whose cutting edge must be kept constantly clean and cool by means of a jet of water; accordingly, and also in order to reduce the danger of workplace accidents, the disk is protected by a housing which is usually rigidly fixed to the casing of the motor assembly.

<patcit id="pcit0001" dnum="US2972344A"><text>US-A-2 972 344</text></patcit> discloses an electric cutter according to the preamble of claim 1.

An object of the present invention is to provide an electric cutter comprising a disk housing with a water-cooled disk cooling which is easy to assemble and not noisy in use, reduces outward water.

Another object of the present invention is to provide a structure which is simple, relatively easy to provide in practice, safe in use, effective in operation and relatively of low cost.

According to the invention, there is provided an electric cutter with a water-cooled disk as defined in claim 1.

Preferred embodiments of the invention are disclosed by the dependent claims.

Further characteristics and advantages of the present invention will become apparent from the following detailed description of a preferred but not exclusive embodiment of an electric cutter with water-cooled disk according to the invention, illustrated only by way of non-limitative example in the accompanying drawings, wherein: <ul id="ul0001" list-style="none" compact="compact"><li><figref idref="f0001">Figure 1</figref> is an exploded perspective view of a disk housing for an electric cutter with water-cooled disk;</li><li><figref idref="f0002">Figure 2</figref> is an enlarged-scale exploded perspective view of the water spray nozzle of the disk housing;</li><li><figref idref="f0003">Figure 3</figref> is a partially sectional front view of a disk housing;</li><li><figref idref="f0004">Figure 4</figref> is a side view of a disk housing with a semicircular plates removed;</li><li><figref idref="f0005">Figure 5</figref> is a top view of the nozzle of <figref idref="f0002">Figure 2</figref>;</li><li><figref idref="f0005">Figure 6</figref> is a sectional side view of the nozzle, taken along the plane VI-VI of <figref idref="f0005">Figure 5</figref>;</li><li><figref idref="f0005">Figure 7</figref> is a sectional front view of the nozzle, taken along the plane VII-VII of <figref idref="f0005">Figure 5</figref>.</li></ul>

With particular reference to the above Figures, the reference numeral 1 generally designates a disk housing for an electric cutter with water-cooled disk blade according to the invention. The disk housing 1 comprises two symmetrical semicircular plates 2, 3 which are peripherally provided with holes in mutually different positions; the first semicircular plate has three holes 4, while the second semicircular plate has two holes 5; said holes are meant for screws for fixing to the two faces of a perimetric support 6, and the semicircular plates are arranged parallel to each other and form, together with the support, a sort of flat box.

The semicircular plates 2, 3 are substantially shaped like half of a regular polygon and have, at the diagonal from which the cutting disk blade D protrudes, respective edges 7 and 8 which are folded inward: the perimetric support 6, which is advantageously formed by molding materials such as the plastics known by the trade-name Nylon, has, on its two faces, respective external ridges 9 and 10 for the interlock coupling of the polygonal edges of the semicircular plates 2, 3.

The perimetric support 6 is provided with interlock coupling means for a water supply duct 11 and for a nozzle 12 for spraying water onto the disk blade.

The nozzle 12 is substantially fork-shaped in order to wrap around the disk and has water passage openings which are directed toward the inside of its prongs. The nozzle 12 is produced by molding materials such as the plastics known by the trade-name Nylon and is constituted by two symmetrical half-shells 13 and 14 which are fork-shaped and can be coupled together by interlocking through the insertion of corresponding pins 15 in corresponding holes 16; passage ducts 17 and water spray openings 18 are formed in the mutually contacting surfaces of the half-shells 13 and 14.

The means for coupling the nozzle to the support are of the type with a tenon 19 for the base of the nozzle, which is crossed by a central hole 20 for the passage of water, and with a mortise 21 formed in the support. In order to lock the nozzle there are provided two mutually apposite pins 22 which protrude from the nozzle, one half of said pins being formed in the half-shell 13 and the other half being formed in the half-shell 14, said pins fitting in corresponding holes 23 of the semicircular plates. It is noted that the nozzle wraps around the cutting edge of the disk blade and that water is sprayed from all sides by means of three spraying points directly toward said disk blade; it is also noted that the nozzle can be easily disassembled and can then be opened, since it is formed by two half-shells, in order to rapidly clean the water passage ducts and openings.

The semicircular plate 2 is provided with means 24 for hermetic rotary coupling to the head 25 of the motor M that drives the disk blade; the coupling means 24 comprise a flared spacer 26 which is centrally crossed by a hole 27 for the passage of the driving shaft. The spacer 26 has, on one face, an annular indent 28 which snugly and rotatably fits in an opening 29 of the semicircular plate 2. The reference numeral 30 designates an annular washer which is crossed by four holes 31 which are distributed in an annular pattern and in which corresponding screws 32 can be inserted. Such screws 32 pass through corresponding holes 33 of the spacer 26 and screw into respective threaded holes of the head 25 of the motor; the coupling means 24 allow the disk blade housing assembly to oscillate about the axis A of the shaft of the motor of the tile cutter.

An articulation pivot 34 for the end 35 of a metal arm 36 is screwed into a hole 34a of the semicircular plate 2; the other end 37 of the metal arm is meant to be articulated, by means of a pivot 37a, to the elements that support the disk blade driving motor, and such arm is meant to cause a coupling of the articulated-parallelogram type in order to turn the disk blade housing when the disk blade driving motor is made to oscillate in a known manner about an axis B in order to keep the disk blade covered in a safe configuration.

The support has, at the mortise for coupling the nozzle to the support and toward the outside, a through hole 38 for the hermetic coupling of a 90° coupling 39 for connection to the duct 11. The duct 11 is controlled by a cock 40, which is advantageously fitted to the disk housing 2 by means of a U-shaped element 41 which has a small hole 42a for fixing to one of the screws of the holes 4 and a wide opening 42b for the passage of the wings of the cock 40.

In the support 6, at the regions affected by the holes 4 and 5 of the semicircular plates, there are provided thicker regions 43 which are crossed by holes 44 for the screws 45 for fixing the semicircular plates; the preferably hexagonal heads of the screws 45 are recessed in corresponding hexagonal seats formed at one of the two ends of the holes 44, while a lock nut 46, preferably of the self-locking type, is screwed at the free ends of the screws, after positioning the respective semicircular plate.

On the opposite side of the support with respect to the one where the nozzle is fixed, the thicker region continues with a portion 47 crossed by a hole 48 which is arranged radially with respect to the half-disk and is meant to accommodate a screw 49 for fixing, by means of a reinforcement plate 50 and a nut 51, a spray guard flap 52 made of a spongy material suitable to absorb sprays. Advantageously, the portion 47 has a notch 53 for the rotation-preventing coupling of the hexagonal head of the screw 49 or rather of the corresponding nut 51.

Conveniently, on the exposed surface of the support 6 there is an arrow 54 which is formed in relief and indelibly indicates the direction of rotation of the cutting disk blade.

The invention thus conceived is susceptible of numerous modifications and variations within the scope of the invention as defined by the claims.

In practice, the materials used, as well as the shapes and the dimensions, may be any according to requirements without thereby abandoning the scope of the protection of the appended claims.

Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.