Tool for cleaning surfaces

The present invention relates to a tool for cleaning surfaces, in particular indoor and outdoor floors. As is known, tools for cleaning surfaces, in particular floors, such as, for example, brooms, may consist of a plate that supports a plurality of bristles and of a handle fixed at an end to the aforesaid plate. The bristles may consist of threads made of plastics, or other material, for example at a maximum tilt of 30° in relation to the supporting plate and with a maximum axial length of 15 centimetres. This tilt is made along the longitudinal axis of the supporting plate. The main drawback, which is encountered above all in brooms ^' for cleaning large surfaces, consists of the great stress to which the user is subject when he uses the broom. In fact, in use, the iiser grips the handle with both hands and to these all the mechanical stress is transmitted that arises from the friction between the bristles and the floor affected by cleaning.

A further drawback that is found in the aforesaid brooms; derives from the system for fixing the handle to the- aforesaid plate. In many cases, the end portion of the handle- intended to be fixed to the plate is . deformed so as to take on a substantially flat configuration. It appears obvious that such a deformation operation is not only expensive but causes less mechanical resistance of the handle with a consequent great risk of breakage of the . handle at the deformed end.

From the state of the art brooms are known that comprise a supporting element of the bristles and a handle connected to said supporting element by damping means suitable for damping mechanical stress transmitted along said handle. Brooms are further known that comprise: a supporting element of the bristles, a coupling element that extends from a surface of the supporting element, and a handle connected to the coupling element, with an axial end portion of said handle that is associated with connecting means suitable for

connecting said axial end portion of said handle to said coupling element.

The position of the handle in relation to the supporting plate of the bristles is substantially fixed, which makes the use of the tool inconvenient, in particular when portions of surfaces have to be cleaned that, in order to be reached easily, would require the tilt of the handle to be modified in relation to the supporting plate of the bristles .

Tools are also known for cleaning surfaces in which it is possible to vary the tilt of the handle in relation to the supporting plate of the bristles, but this operation is generally complex and not easy to perform, in addition there is no absolute guarantee of the tilted position of the handle being maintained in relation to the supporting plate of the bristles.

Lastly, replacing the supporting plate of the bristles is complex and requires a considerable outlay of time.

The present invention intends to remedy the aforesaid drawbacks .

According to the present invention a tool is provided for cleaning surfaces comprising a supporting element that holds a plurality of bristles, or groups of bristles and a handle for gripping and manoeuvring said tool, characterised in that it further comprises a coupling element that can be connected removably to said supporting element and to which said handle (106) can be removably connected.

The tool according to the invention enables the supporting element of the bristles to be replaced simply and rapidly when the latter are worn.

According to an advantageous embodiment of the present invention, between said coupling element and said handle there is provided an attachment element, to which said handle is fixable in a movable manner, said attachment element having an angular position that is adjustable in relation to said coupling element.

This enables the tilt of the handle of the tool to be adjusted so as to optimise the manageability of the tool according to the invention substantially in any condition of use.

According to a further advantageous embodiment of the present invention, damping means is provided between said handle and said attachment element, to damp and/or absorb possible anomalous stress, arising, for example, from blows of the supporting element of the bristles against obstacles whilst the tool is used.

Certain methods of implementing the invention will be disclosed below by way of non-limiting example with reference to the attached drawings, in which:

Figure 1 is a perspective view of a supporting element of the bristles of a tool for cleaning surfaces according to the invention;

Figure 2 is a side view of the supporting element in Figure l;

Figure 3 is a top view of the supporting element in Figure

1;

Figure 4 is a bottom view of the support in Figure 1;

Figure 5 is a raised view of a first embodiment of a coupling element for coupling a handle with the supporting element of the bristles;

Figure 6 is a top view of the coupling element in Figure 5;

Figure 7 is a perspective view of the coupling element in

Figure 5 ;

Figure 8 is a raised view of a second embodiment of a coupling element for coupling a handle with the supporting element of the bristles; ^" .

Figure 9 is a top view of the coupling element in Figure 8;

Figure 10 is a perspective view of the coupling element in

Figure 8 ;

Figure 11 is a raised view of a first embodiment of an attachment element for the handle that can be associated with the coupling element in Figures 8 to 10;

Figure 12 is section XII-XII in Figure 11;

Figure 13 is a perspective view of the attachment element in

Figure 11;

Figure 14 is a raised view of a set consisting of the coupling element in Figure 8, inserted into the supporting element of the bristles in Figure 1, and of the attachment element in Figures 11 to 13;

Figure 15 is a top view of Figure 14;

Figure 16 is section XVI-XVI of Figure 15;

Figures 16a and 16b illustrate a detail of Figure 16;

Figure 17 is a perspective view of the set in Figure 14;

Figure 18 is section XVIII-XVIII of Figure 14;

Figure 19 is an enlarged detail of Figure 18;

Figure 20 is a raised view of a second embodiment of the attachment element for the handle of the tool according to the invention;

Figure 21 is section XXI-XXI in Figure 20;

Figure 22 is a perspective view of the attachment element in

Figure 20;

Figure 23 is a raised view of a damping element associable with the attachment element shown in Figures 20 to 22;

Figure 24 is section XXIV-XXIV of Figure 23;

Figure 25 is a perspective view of the damping element in

Figure 23;

Figures 26 to 31 show different operating positions that the attachment element in Figure 20 can assume in relation to the coupling element;

Figure 32 shows a third embodiment of the attachment element associable with the coupling element in Figure 8;

Figure 33 is a section XXXIII-XXXIII in Figure 32;

Figures 34 and 35 show a version of the second embodiment of the attachment element, shown in Figures 20 to 31;

Figure 35a shows a detail of the version of Figures 34 and

35;

Figure 35b is a section XXXVb-XXXVb in Figure 35a;

Figure 36 is a raised view of a third embodiment of the coupling element associable with the supporting element of the bristles;

Figure 37 is a top view of Figure 36;

Figure 38 is a perspective view of Figure 36;

Figure 39 is an elevated view of a fourth embodiment of the attachment element, associable with the coupling element shown in Figures 36 to 38;

Figure 40 is section XL-XL in Figure 39;

Figure 41 is a perspective view of the attachment element in

Figure 39;

Figure 42 is a perspective view of a set consisting of the coupling element in Figures 36 to 38, associated with the supporting element of the bristles in Figure 1,. and of the attachment element in Figures 39 to 41;

Figure 43 is a top view of a mounting version of the attachment element in Figures 39 to 41 in the coupling element in Figures 36 to 38; ^■

Figure 44 is section XLIV-XLIV of Figure '43; ^•

Figures 45 to 47 show various operating positions that the attachment element in Figures 39 to 4'1 can assume in the mounting version shown in Figures 43 and-44; ^• : ^■

Figure 48 is a section like that in Figure '44, relating to the set in Figure 42;

Figure 49 is a raised view of a fifth embodiment of the attachment element, associable with the coupling element shown in Figures 36 to 38;

Figure 50 is a section XL-XL of Figure 49;

Figure 51 is a perspective view of the attachment element of

Figure 49 ;

Figure 52 is a raised view of a set consisting of the coupling element in Figures 36 to 38, inserted into the supporting element of the bristles in Figure 1, and of the attachment element in Figures 49 to 51;

Figure 53 is a longitudinal section of the set of Figure 52;

Figure 54 is a perspective view of a fourth embodiment of the coupling element, associable with the attachment element shown in Figures 39 to 41 or with the attachment element shown in Figures 49 and 51;

Figure 55 is a perspective view of an adapting element for connecting the handle to the attachment element;

Figure 56 is a top view of the adapting element in Figure

55.

Figure 57 shows a sixth, variant embodiment of the attachment element according to the invention,-

Figures 58 and 59 show the mounting of the handle of the tool according to the invention on an attachment element, respectively without and with the adapting element of

Figures 55 and 56.

In the description that follows, the elements common to the embodiments of the invention shown will be marked by the same reference numbers .

In Figures 1 to 4 there is shown a .supporting element for bristles 1 of a tool for cleaning surfaces according to the invention, which is configured to be coupled simply and rapidly with a coupling element, which will be disclosed below, intended for receiving a handle for gripping and moving the tool .

The support for bristles 1 is provided, in a first face 2 intended for receiving said coupling element, with a seat 3 intended to be coupled with said coupling element; the seat

3 is provided with a series of protrusions 4 suitable for preventing movements of the coupling element in a direction that is perpendicular to the supporting element 1.

A second face 5 of the supporting element 1 opposite the first face 2 is provided with a plurality of grooves 6 intended for receiving groups of bristles for removing dust and other solid substances from surfaces, said bristles being made, for example, of plastics or other materials, also of natural origin. The grooves 6 preferably have a circumference arc configuration.

On the bottom of the seat 3 there is provided at least a hole 7 intended for receiving a fixing element 34a (Figure 15), for example a screw, or other suitable fixing means, for fixing the coupling element to the supporting element 1. It is advantageous for the width of the supporting element 1 to increase progressively to a front end 2a thereof. This makes the tool cleaning action more effective. In Figures 5 to 8 there is shown a first embodiment of a coupling element 8 suitable for coupling with the supporting element 1; the coupling element 8 is intended for coupling with a gripping element, for example a handle, by means of which it is possible to grip and handle the tool according to the invention, to remove dust or other dirt from a surface .

The coupling element 8 comprises a body 9 provided with a base 10 suitable for being slidingly inserted into the seat 3 of the supporting element 1. The base 10 is provided peripherally with a groove 11 intended for coupling with the protrusions 4 of the supporting element 1, so that movements of the coupling element 8 are prevented in a direction that is perpendicular to the seat 3 of the supporting element 1. The coupling element 8 comprises an attachment element 12 on which said handle can be inserted and fixed. The attachment element 12 is preferably tilted by an angle α in relation to a perpendicular to the base 10, the angle α being preferably comprised between approximately 15° and approximately 30° . The attachment element 12 is provided with a shank 13 intended to be inserted into a hollow end of said handle. The shank 13 is provided with two through holes 14 and 15 intended for receiving the stem of a respective bolt for coupling and fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so as to receive the nut of the bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13 so that the handle of the tool can be mounted only on a preset angular position on the shank 13, which is particularly advantageous

in the case of a handle with an ergonomic shape, to prevent the handle being mounted in an incorrect position. In the base 10 of the body 9 there is made a hole 16, that, when the coupling element 8 is inserted into the seat 3 of the supporting element 1, is aligned with the hole 7 of said seat and is intended for receiving the fixing element 34a, to fix the coupling element 8 to the supporting element 1. In Figures 8 to 10 there is shown a second embodiment of a coupling element 8 in which the body 9 is provided with a cradle element 17 intended for coupling with an angularly movable attachment element, for example the attachment element 18 in Figure 11, which will be disclosed in detail below.

On the bottom of the cradle 17 there are provided protrusions 19, for example in the form of toothing that is intended for fixing the angular position of the angularly movable attachment element.

The cradle 17 is provided with side walls 20 in each of which there is provided a respective through hole 21 intended for receiving a pivot 22 (Figure 18) that constitutes the rotation axis of the attachment element in relation to the cradle 17. The bottom of the cradle 17 with the protrusions 19 can be made of an interchangeable insert, for example made of a material with great resistance to wear. In each of said side walls 20 a respective slot 23 is further made through which a locking element 24 can be inserted (Figure 14) that is coupled with the attachment element 18 to lock the angular position thereof in relation to the cradle 17.

In Figures 11 to 13 there is shown the attachment element 18 that comprises a body 25 provided above with a shank 13 intended for coupling with said handle . In the shank 13 two through holes 14 and 15 are made that are intended for receiving the stem of a respective bolt for fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so as to receive the nut of the

bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13 , to enable mounting of the handle in a predefined angular position in relation to the shank 13, as mentioned before .

In the body 25 there is made a through hole 26 intended for receiving the pivot 22 that constitutes the rotation axis of the attachment element 18 in relation to the cradle 17 of the coupling element 8.

In the lower part of the body 25 there is made a seat 27 intended for receiving a positioning element 28 (Figures 16a, 16b) intended for coupling with the protrusions 19 obtained on the bottom of the cradle 17 of the coupling element 8 to determine the angular position of the attachment element 18 in relation to the cradle 17. The positioning element 28 comprises a body 29 in the lower face of which there are obtained protrusions 30, for example in the shape of toothing, shaped so as to couple with the protrusions 19 of the cradle 17 to. determine the angular positioning of the attachment element 18 in the cradle 17. ^■ The body 29 can move in the seat 27 'guided by the walls of- the seat. The body 29 is provided with a slot 31 that can be used for the passage of the locking element 24, if it is present. The movement of the body 29 is contrasted by an elastic element 32, for example a coil spring wound around an upper protrusion 33 of the body 29 and compressed between the body 29 and a bottom wall 34 of the seat 27. The walls of the seat 27 enable the positioning element 28 to move in a direction substantially perpendicular ^' to the bottom of the cradle 17, so that the protrusions 30 disengage from the protrusions 19 of the cradle 17 to enable the angular position of the attachment element 18 to be modified.

In the side walls 35 of the seat 27 respective through holes 36 are obtained through which the locking element 24 can pass.

The locking element 24 is optional inasmuch as the positioning element 28 is already effective for maintaining the angular position of the attachment element 18 in the cradle, owing to the action of the spring 32. In order to vary the angle, it will be sufficient to give a thrust to the handle so as to overcome the force of the spring. The locking element 24 can consist of a screw 24a and of a nut 24b, by screwing which on the screw 24a it is possible to lock the attachment element 18 in the cradle 17 in a set angular position. In order to change the angular position of the attachment element 18, it is sufficient to loosen the nut 24b, exert on the handle connected to the attachment element 18 a thrust suitable for causing rotation of the attachment element 18 around the pivot 22, until the attachment element 18 is moved to a new angular position, finally screwing the nut 24b to lock the attachment element 18 in the new angular position.

When the nut 24b is tightened, the walls of the cradle 17 tend to become deformed in the direction of the side walls 35 of the seat 27 of the attachment element ^' 18. In order to obtain only partial locking of the attachment element 18, in each of said side walls 35, at said holes 36 there can be provided a slight recess 37 for assisting the deformation of the respective wall of the cradle 17 and prevent excessively high friction resistance developing between the attachment element 18 and the cradle 17, so that it is still possible to move angularly the attachment element 18 in relation to the cradle 17, exerting a thrust that is of appropriate intensity on the handle of the tool. In Figures 20 to 22 there is shown a second embodiment of an attachment element 38.

The attachment element 38 comprises a body 39 provided above with a shank 13 intended for coupling with said handle. In the shank 13 two through holes 14 and 15 are made that are intended for receiving the stem of a respective bolt for fixing the handle to the shank 13. A respective end 14a, 15a

of said through holes is shaped so as to receive the nut of the bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13 to enable the handle to be mounted in a preset angular position in relation to the shank 13 , as mentioned before .

In a pair of opposite side walls 39a of the body 39 respective through holes 40 are made that are aligned with one another, through which the pivot 22 passes that constitutes the rotation axis of the attachment element 38 in relation to the cradle 17 of the coupling element 8. In the lower part of the body 39 there is obtained a seat 41 intended for receiving a damping element 42 (Figures 23 to 25) the function of which will be explained in detail below. In a pair of opposite side walls 41a of said seat ^• 41 respective further through holes 41b are made that are aligned together and with the through holes 40 to enable the pivot 22 to pass through.

In Figures 23 to 25 there is shown the damping element 42, which comprises a body 43 in the top part of which, terminating above with a curved face 43a, there are obtained, on respective opposite faces 46, respective first seats 44 and second seats 45, intended for housing a respective torsion spring 50 (Figure 26) . In the lower part of said opposite faces 46 respective through holes 47 are obtained that are aligned with one another, through which the locking element 24 is intended to pass when the damping element 42 is inserted into the seat 41 of the attachment element 38.

In the upper part of the body 43 there is made a further through hole 48, that communicates at the ends with said second seats 45 and has an axis that is parallel to the axis of the through holes 47.

The further through hole 48 is used for the passage of the pivot 22 when the damping element 42 is inserted into the seat 41 of the attachment element 38. In the lower part of

the body 43 a seat 49 is made that is intended for receiving the positioning element 28 disclosed above.

When the attachment element 38 is inserted into the cradle 17, between the damping element 42 and the walls of the cradle 17 two washers 98 are interposed (shown only in the section in Figure 21) that are used for making mechanical compression locking possible between the cradle 17 and the damping element 42. This locking, together with the downward thrust of the spring 32, means that the positioning element 28 does not disengage from the teeth 19 of the cradle 17 even if a considerable force is exerted on the handle. In this manner, by means of the locking element 24 it is possible to lock the position of the damping element 42 in relation to the cradle 17, nevertheless leaving the attachment element 38 free to oscillate around the damping element 42.

In Figures 26 to 31 various angular positions are shown that can be assumed by the attachment element 38 in relation to the coupling element 8; there is further illustrated the operation of the damping element 42.

When, during use of the tool according to the invention the supporting element 1 of the bristles 3 knocks against an obstacle, the attachment element 38, to which the handle of the tool is connected, can rotate by a few degrees around the pivot 22, in relation to the attachment element 38, the rotation being contrasted elastically by the torsion springs 50, which are mounted in the respective seats 44, 45 and elastically absorb the stress due to the impact of the supporting element 1 against an obstacle, so that said stress is not transmitted unchanged to the handle . The torsion springs are mounted so as to act in opposite directions, so as to enable rotation of the attachment element 38 to be contrasted elastically both in a clockwise and anticlockwise direction.

In Figures 32 and 33 there is shown a third embodiment of an attachment element 51 according to the invention that is associable with the coupling element 8.

The attachment element 51 comprises a body 52 provided with a shank 13 intended for coupling with a handle of the tool according to the invention. In the shank 13 two through transverse holes 14 and 15 are made to receive the stem of a respective bolt for coupling and fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so as to receive the nut of the bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13, to enable the handle to be mounted in a predefined angular position in relation to the shank 13, as mentioned before. In the body 52 there is made a through hole 26 intended for receiving the pivot 22 that constitutes the rotation axis of the attachment element 51 in relation to the cradle 17 of the coupling element 8.

On opposite faces of the body 52 respective seats 53 are made, each of which is intended to house a respective torsion spring 50.

In the lower part of the body 52, on opposite sides thereof, respective through holes 54 are made that are aligned with one another and with the slits 23 of the coupling element 8 and are intended for receiving a further pivot 55 that protrudes from both ends from the through holes 54, to engage in the slits 23, so as to act as a stroke-stop element for the rotation of the attachment element 51 in relation to the coupling element 8.

The attachment element 52 is not lockable in a fixed angular position in relation to the coupling element 8, but can rotate freely in relation thereto around the pivot 22, the rotation being elastically contrasted by the torsion springs 50 and limited by the interaction between the slits 23 and the further pivot 55: in fact, when through the effect of the rotation of the attachment element 51 the further pivot

55 knocks against the end edges of the slits 23, the rotation of the attachment element 51 stops.

The size of the rotation of the attachment element 51 obviously depends on the length of the slits.

This embodiment of the attachment element 52 is advantageously usable when it is foreseeable that the tool according to the invention has to be used in conditions that require frequent handle tilt variations to reach all the zones of the surface to be cleaned.

In Figures 34 to 35 there is illustrated a version 38a of the attachment element 38 shown in Figures 20 to 31.

In this version, the torsion springs 50 are replaced by a leaf spring 56, associated with a damping element 42a.

The leaf spring 56 is inserted between the upper curved surface 43a of the damping element 42a and the bottom of the seat 41 of the attachment element 38.

The leaf spring 56 has on both sides two notches 56a, that divide each side of the spring into a central part 56b and two side parts 56c, that diverge in relation to the central' part 56b. The side parts 56c interact with the body of the attachment element 38a to damp possible stress transmitted to the handle of the tool according to the invention by blows of the supporting element 1 against obstacles, performing the same function as the torsion springs 50 disclosed with reference to the previously disclosed attachment element 38. The central parts 56b of each side of the spring interact with respective protuberances 56d provided on opposite walls 46 of the damping element 42a to maintain the latter in position.

The leaf spring 56, in relation to the torsion springs 50, has the advantage of having greater resistance to stress and greater ease of assembly.

In Figures 36 to 38 there is illustrated a third embodiment of a coupling element 57 according to the invention.

In this third embodiment, the coupling element 57 comprises a body 58 consisting of two walls 59 parallel to one

another, partially connected by a connecting element 60, so that a space 61 between the two walls 59 remains accessible above from the outside.

The base of each wall 59 is connected to a horizontal fixing plate 62, provided with a series of holes 63 through which the fixing elements 73 (Figure 42) can pass to connect the coupling element 57 to the supporting plate 1 of the bristles. Said fixing elements 73 may, for example, be self- tapping screws .

On each of the walls 59 there is made a slot 64 substantially with a circumference configuration, a plurality of further holes 65, arranged on a circumference arc internally concentric with respect to the slot 64 and a still further hole 66 the centre of which coincides substantially with the centre of the circumferences along which are arranged the slot 64 and the further holes 65. The coupling element 57 is associable with a fourth embodiment of an attachment element- .67 according to the invention, which is shown in Figures 39 to .47.■ The attachment element 67 comprises a body 6.8 provided above with a shank 13 intended to be inserted into a hollow end of the handle of the tool according to the invention. The shank 13 is provided with two through holes 14 ^' and .15- intended for receiving the stem of a respective bolt for coupling and fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so as to' receive the nut of the bolt; the shaped ends 14a, 15a are made on. opposite sides of the shank 13, to enable a mounting of the handle in a preset angular position in relation to the shank 13, as mentioned before.

The lower part 69 of the body 68 has a shape and dimensions such as to be inserted with minimum clearance into the space 61 between the walls 59 of the coupling element 57. In said lower part 69 there is made a through, hole 70, that, when the attachment element 67 is inserted into the space 61 between the walls 59 of the coupling element 57, is intended

to be aligned with the holes 66 of said walls 59 to receive a pivot 70a (Figure 44) constituting a rotation axis of the attachment element 61 in relation to the coupling element 57. The hole 70 can be made of dimensions such as to receive a bush that is free to rotate in the hole 70, that protrudes slightly from the ends of said hole 70 and through which the pivot 70a is passed. The bush is used to prevent possible friction between the attachment element 61 and the walls 59 of the coupling element 57, which would hinder the rotation of the attachment element 61 around the pivot 70a. In the body 68 a slot 71 is further made, having a circumference arc configuration intended to be aligned with the holes 65 made in the walls 59 of the coupling element 57, when the attachment element 61 is inserted into the space 61 between the walls 59 of said coupling element 57. Said holes 65 and said slot 71 are used to define the angular excursion of the attachment element 67 in relation to the coupling element 57. In fact, by inserting a plug 72 into a pair of corresponding holes 65 of the walls 59 the latter acts as a stroke stop for the angular excursion of the attachment element 67 in relation to the coupling element 57. In fact, the plug 72 passes through the slot 71 and when, through the effect of rotation of the attachment element 67 it comes into contact with an end wall of the slot 71, it prevents further rotation of the attachment element 67 in the direction of said end wall. The body 68 has a protrusion 74 on which is fixed an end of an elastic element 75, for example a coil spring, the opposite end of which is fixed to a fixing element 76 provided on the connecting element 60.

The elastic element 75 is used to absorb and dampen stress due to blows of the supporting element 1 against possible obstacles during use of the tool according to the invention. The angular position of the attachment element 67 in relation to the coupling element 57 can be fixed by a locking element 77, for example consisting of a bolt, the

stem of which passes through the slots 64 of the walls 59 of the coupling element 57 and through a through hole 78 made in the body 68 of the attachment element 67.

Between a head 80 of the locking element 77 and the corresponding wall 59 of the coupling element 57 there is inserted a further elastic element 81, for example a coil spring, for adjusting the clamping force exerted by the locking element 77. This clamping force determines the friction resistance that develops between the walls 59 of the coupling element 57 and the body 68 of the attachment element 67 and which contrasts the rotation of the attachment element 67 in relation to the coupling element 57, so as to enable or prevent rotation movements of the attachment element 67 according to whether, during use of the tool according to the invention, a variation of the angle of the element 67 in relation to the element 57 is necessary or not.

In order to reduce wear to the body 67, .concentrically to the hole 78 there is a seat 78a into which a washer in wearproof material can be inserted.

In Figures 45 to 47 different angular stroke stops of the attachment element 67 are shown that are obtainable by inserting the plug 72 into the various holes 65 made in the walls 59 of the coupling element 57.

In Figure 48 there is illustrated a version of the coupling between the attachment element 67 and the- coupling element 57/ in which there is no elastic element 75. In this case, the damping of stress due to possible blows of the tool against an obstacle is entrusted to the friction resistance between the walls 59 of the coupling element 57 and the body 68 of the attachment element 67, which is adjustable by tightening the bolt 77 and the further spring 81 inserted onto the shaft of the bolt 77.

In Figures 49 to 51 there is illustrated a fifth embodiment of an attachment element 82 according to the invention, associable with the coupling element 57.

The attachment element 82 comprises a body 83 provided above with a shank 13 intended to be inserted into a hollow end of the handle of the tool according to the invention. The shank 13 is provided with two through holes 14 and 15 intended for receiving the stem of a respective bolt for coupling and fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so as to receive the nut of the bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13 , to enable a mounting of the handle in a preset angular position in relation to the shank 13, as mentioned before .

The lower part 84 of the body 83 has a shape and dimensions such as to be inserted with minimum clearance into the space 61 between the walls 59 of the coupling element 57. In said lower part 84 a through hole 84a is made that, when the attachment element 82 is inserted into the space 61 between the walls 59 of the coupling element 57, is intended to align itself on the holes 66 of said walls 59 to receive the pivot 70a constituting the rotation axis of the attachment element 82 in relation to the coupling element 57.

Said pivot 70a can be housed inside a bush, as already disclosed above.

In the body 83 a seat 85 is further obtained that is intended for housing an elastic element 86 (Figures 52 and 53), for example a coil spring. The seat 85 communicates at an end with a slot 87 into which a bush 88 is inserted into which the spindle of the locking element 77 disclosed above passes .

The slot 87 has a shape and dimensions such as to permit small rotations of the attachment element 82 in relation to the coupling element 57 when the locking element is in the clamping position.

These small rotations of the attachment element 82 are contrasted by the spring 86, which thus damps possible anomalous stress due to blows of the tool against obstacles,

so that said anomalous stress is not transmitted unaltered to the handle of the tool . The attachment element 82 has the advantage that the springing force provided by the spring 85 is constant in any corresponding angular position of the attachment element in relation to the coupling element . The slot 87 and the bush 88 can be dimensioned so that the bush 88 can receive the coil spring 81, to adjust the clamping force exerted by the locking element 77. In this case, the coil spring 81 is thus not visible on the outside of the coupling element, making the aesthetics thereof more appealing.

In Figures 52 and 53 there is shown the attachment element 82 mounted in the coupling element 57.

In Figure 54 there is shown a fourth embodiment of a coupling element 89 according to the invention. The coupling element 89 is suitable for coupling with the attachment elements 67, or 82.

The coupling element 8.9 is provided with a base 90 suitable for being slidingly inserted into the seat 3 of the supporting element 1. The base 90 is provided peripherally with a groove 91, intended for coupling with the protrusions 4 of the supporting element 1, so that movements of the coupling element 89 are prevented . in a direction perpendicular to the seat 3 of the supporting element 1. The coupling element 89 further comprises two walls 92 that are parallel to one another that rise from the base 90 and are substantially perpendicular thereto; the two walls 92 define a space 93 together into which the lower part 69, respectively 84, of an attachment element 67, respectively 82, is inserted.

On each of the walls 92 there is made a slot 94, with a substantially circumference arc configuration, intended for the passage of the stem of the bolt 80, to enable or prevent a possible variation of the angular position of the attachment element .

The slot 94 is surrounded by respective seats 99 and 100 made respectively on the external side and on the internal side of the respective wall 94, said seats 99, 100 being suitable for housing respective wearproof elements (not shown) the object of which is to prevent progressive wear to the walls 94 through the effect of the friction that develops between the walls 94 and the attachment element when the locking element is clamped.

Each wall 92 is further provided with a hole 95 that is intended to align itself with the hole 70, respectively 84a, of the attachment element 67, respectively 82, for receiving the pivot 70a constituting the rotation axis of the attachment element 67, respectively 82, in relation to the coupling element 89.

In Figures 55 and 56 there is illustrated an adapting element 96 that is insertible in a shapingly coupled manner onto the shank 13 of an attachment element and is intended to be inserted into the hollow end of the handle of the tool. By varying the external diameter of the adapting element 96 it is possible to couple handles of various diameter with the attachment element .

The adapting element 96 is provided with holes 97 for passing fixing elements of the handle to the shank 13. The shaping coupling between the adapting element 96 and the shank 13 is made in such a manner that when the handle of the attachment element is extracted the adaptor remains fixed to the shank 13.

In Figure 57 there is illustrated a sixth embodiment of' an attachment element 101, associable with the coupling element 57, or 89. The attachment element 101 comprises a body 102 provided above with a shank 13 intended to be inserted into a hollow end of the handle of the tool according to the invention. The shank 13 is provided with two through holes 14 and 15 intended for receiving the stem of a respective bolt for coupling and fixing said handle to the shank 13. A respective end 14a, 15a of said through holes is shaped so

as to receive the nut of the bolt; the shaped ends 14a, 15a are made on opposite sides of the shank 13, to enable a mounting of the handle in a preset angular position in relation to the shank 13 , as mentioned before .

The lower part 104 of the body 102 has a shape and dimensions such as to be inserted with minimum clearance into the space 61 between the walls 59 of the coupling element 57, and the space 93 between the walls 92 of the coupling element 89.

In said lower part 104 there is made a through hole 105, that, when the attachment element 101 is inserted into the space 61 between the walls 59 of the coupling element 57, or into the space 93 between the walls 92 of the coupling element 89, is intended to be aligned with the holes 66 of said walls 59, or with the holes 95 of said walls 92, to receive the pivot 70a constituting the rotation axis of the attachment element 101 in relation to the coupling element

57, or 89.

Said pivot 70a can be housed inside a bush, as already disclosed above.

In the body 102 there is further obtained a further through hole 103 into which a bush is insertable in which the stem of the locking element 77 disclosed above passes.

The further through hole 103 and said bush can be dimensioned so that the bush can receive the coil spring 81 to adjust the clamping force exerted by the locking element

77. In this case, the coil spring 81 will thus not be visible from the outside of the coupling element, making the aesthetics thereof more appealing.

In Figures 58 and 59 there is shown the coupling between the handle 106 of the tool according to the invention and the shank 13 of an attachment element, with or without the interposition of an adapting element 96. In the Figures there is shown the coupling with an attachment element 68, but it is to be understood that the coupling between the

handle and the attachment element occurs in the same manner as for all the attachment elements disclosed above. The handle 105, at the end thereof intended to be coupled with the shank 13 of the attachment element, is provided with a first hole 107, intended to be aligned with the end of the hole 14 of the shank 13 opposite the seat 14a, and with a second hole 108, intended to be aligned with the end of the hole 15 of the shank 13 opposite the seat 15a. The arrangement of the holes 107 and 108 is such that the handle 105 can be mounted on the shank 13 in a preset angular position, that position, i.e. in which the holes 107 and 108 are aligned with the holes 14 and 15 of the shank 13, as disclosed above. This is particularly advantageous when the handle 105 has an ergonomic shape that requires a preset mounting position, inasmuch as the arrangement of the holes 107 and 108 prevents the handle being mounted in a position that is not correct, i.e. in a position other than the preset position.

In the case of mounting with the adapting element 96,.: the holes 91 of the adapting element will be aligned with the holes 107 and 108 of the handle 105 and with the holes 14 and 15 of the shank 13.

In the practical embodiment, the materials, dimensions and constructional details may be different from those indicated but be technically equivalent thereto without thereby going beyond the scope of the invention, as defined by the claims .