EP3638471A1 - Improved handheld motorized cutting device and relative accessory - Google Patents

Improved handheld motorized cutting device and relative accessory

Info

Publication number
EP3638471A1
EP3638471A1 EP18727424.6A EP18727424A EP3638471A1 EP 3638471 A1 EP3638471 A1 EP 3638471A1 EP 18727424 A EP18727424 A EP 18727424A EP 3638471 A1 EP3638471 A1 EP 3638471A1
Authority
EP
European Patent Office
Prior art keywords
motor shaft
accessory equipment
hub
cutting
support ring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18727424.6A
Other languages
German (de)
French (fr)
Other versions
EP3638471B1 (en
Inventor
Vincenzo Montoli
Luigi Casartelli
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Brevetti Montolit SpA
Original Assignee
Brevetti Montolit SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Brevetti Montolit SpA filed Critical Brevetti Montolit SpA
Publication of EP3638471A1 publication Critical patent/EP3638471A1/en
Application granted granted Critical
Publication of EP3638471B1 publication Critical patent/EP3638471B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B9/00—Portable power-driven circular saws for manual operation
    • B27B9/02—Arrangements for adjusting the cutting depth or the amount of tilting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle

Definitions

  • the present invention relates to a handheld motorized cutting device or tool, in particular a device with a rotat ⁇ ing cutting blade, provided with an auxiliary accessory.
  • motor rotating blade cutting devices of the handheld type.
  • these devices comprise a freehand gripping motor unit, which carries at its end a free circular blade, gen ⁇ erally a thin diamond disc, brought into rotation by the motor unit .
  • the motor unit is inserted into a casing, provided ex ⁇ ternally with on/off switches, with handles to improve the retention by the operator and possibly with a safety blade protective shield.
  • This device is light and not bulky, which is much appre ⁇ ciated because it promotes portability and does not tire the operator. Since it is very easy to use, however, this type of cutting tool lends itself to incorrect use, especially in the precarious conditions of a construction site.
  • the tile or stone slab is fixed cantilevered on a support, for example by means of a clamp (or sometimes simply by the pressure of a foot), and then the operator performs cutting by starting the electric motor and bringing the rotating diamond disc to make the cut in the cantilevered part of the material.
  • the problem presented here - particularly when the cut is longer than a few centimetres - is that the guide of the motorized device, for example along a line previously drawn on the tile surface, is difficult and leads to a not per ⁇ fectly straight cut.
  • the difficulty is inherent in the fact that the device is relatively light compared to the stresses that are transferred by the rotating blade, it must be sup- ported freehand moving with the whole body and keeping it at a correct distance from the material plane to cut through the whole depth of the slab, but without abutting the surface of the material (because it could cause damage) . Without lateral guidance and without the possibility of support, it is difficult to perform perfectly controlled cuts.
  • Cutting devices operated freehand by the operator, which provide a support on the surface to be cut, are already available on the market: these are the disc saws for cutting small-thickness timber. These devices include, especially for safety reasons, a cage which - mounted on the casing of the drive motor, centred on the shaft of the toothed disc saw - is provided with an adjustable flat frame, intended to rest on the surface of the wood plane to be cut. This frame, which comprises a cutout through which the disc saw passes, is adjustable in position, so as to predetermine the height of the cutting disc with respect to the material plane.
  • an accessory for a motorized and handheld cutting tool, comprising a hub to be coupled to a motor body of said tool, coaxially to a motor shaft, and a supporting surface suitable for resting on a surface of a material to be cut, wherein said hub is integral with an inner ring of a rotating bearing having a central hole adapted to be in ⁇ serted coaxially on said motor shaft of said motorized cut ⁇ ting tool, and said supporting surface is constituted by a support ring which is integral in rotation to an outer ring of said rotating bearing.
  • the axial size of said support ring is lower than the axial size of at least one of said inner ring of the rotating bearing.
  • the axial size is less than 1 cm, preferably less than 0.8 cm.
  • the support ring has at least said peripheral surface made of either an anti-abra ⁇ sion material or a high-friction soft material.
  • the hub has an axial threaded hole and at one end thereof it is provided a cir- cular centring protrusion for a cutting disc.
  • a clamping flange consisting of a cylindrical centring body and a flat head flange, crossed centrally by a threaded hole.
  • a handheld motorized cut- ting tool assembly comprising a hand-held casing containing an electric motor provided with a motor shaft, projecting to the outside of the casing, provided with a base abutment surface and a threaded end portion, a cutting disc and a clamping flange being closely locked on said motor shaft, characterized in that an accessory as described above is also closely locked between said clamping flange and said abutment surface.
  • the clamping flange consists of a cylindrical centring body and a flat head flange, crossed centrally by a threaded hole.
  • an outer diameter of the cylindrical centring body is equal to the one of a central hole of said cutting blade.
  • fig. 1 is an overall perspective view of a motorized cutting tool provided with the accessory according to a first embodiment of the invention, without a cutting disc;
  • fig. 2 is a view similar to Fig. 1, with a mounted cutting disc;
  • fig. 3 is a view similar to that of fig. 2 according to a different perspective;
  • fig. 4A is a perspective exploded view of the embodiment of fig . 2 ;
  • fig. 4B is a view similar to that of fig. 4A of a different embodiment of the invention.
  • fig. 5 is a perspective exploded view of the accessory according to the invention.
  • an accessory according to the invention is well represented in its entirety applied to a cutting device which, as it is known per se, is not illus ⁇ trated in each single detail.
  • a rotary blade handheld cutting device comprises, in a per se known manner, a casing 1, inside which an electric drive motor (not shown in the drawings) is ar ⁇ ranged which ends with a motor shaft la, on which standard tools are applied.
  • the end of the motor shaft la which protrudes out of the casing 1 has a calibrated cylindrical section on which a stop flange is fit, integral in rotation, provided with a cylindrical protrusion which acts as a coupling and centring means for a central hole 2a of a cutting disc 2 (for example a diamond disc) ;
  • the shaft la then terminates with a standard threaded portion, on which a clamping flange lb adapted to hold the cutting disc 2 against the abutment flange is designed to be engaged, so as to prevent any rel ⁇ ative movement between the disc and the shaft la.
  • a support accessory on the motor shaft la, which provides a ring idle with respect to the shaft la, which acts as a support on a surface of the material to be cut.
  • the support accessory consists of a bear ⁇ ing body 4 on whose ring or outer track a support ring or wheel 5 is integral.
  • the bearing 4 is dimensioned in such a way that it can be fit centred on the shaft la.
  • the inner ring or track of the bearing 4 is integral with a hub 6 provided with a central hole, designed to house the threaded end portion of the motor shaft la.
  • This central hub 6 is coupled to the inner ring of the bearing 4, for example, on one side, with an abutment surface 6a and, on the other, by a Seeger TM circlip 6b.
  • the hub 6 has a threaded central hole 6c of a diameter equal to the nominal diameter of the motor shaft la. At one end of the hub 6, manoeuvring holes 6' are also provided.
  • the hub 6 has a circular protrusion 6r (visible only in fig. 1) on which the central hole 2a of the cutting disc 2 is centred, typically the hole 2a being of diameter greater than the diameter of the motor shaft la.
  • the abutment flange (supplied as stand ⁇ ard equipment of the tool) is removed from the motorized device and, using an appropriate tool (not shown) to act on the holes 6', the hub 6 is tightened strongly against the abutment surface of the motor shaft la.
  • the support ring 5 integral with the outer ring of the bearing 4 has a modest thickness (axial size) , for example less than 1 cm or preferably 0.8 cm, so that the motor shaft la can pass through the hole 6c and protrude by a sufficient extent (as shown in fig. 1) to be able to still house on its axis both a cutting disc 2, centred on the protrusion 6r, and a relative clamping flange lb (figs. 2 and 3) intended to clamp closely the disc 2 against the hub 6 of the bearing 4, which in turn is integral in rotation with the motor shaft la.
  • the hub 6 of the bearing 4 preferably has a width greater than that of the outer ring and of the support ring 5 integral with it, so that the two lateral bearing surfaces of the hub - on one side against the abut- ment surface of the shaft la, on the other side against the cutting disc 2 which is in contact with it - are external to the two laying planes of the outer ring of the bearing and of the support ring 5. In this way, the support ring 5 remains free to rotate idly in close proximity to the side surface of the cutting disc 2.
  • the cutting disc 2 is in a position along the motor shaft la not too far from the original design, so as to avoid interference with the pos ⁇ sible protective shield 3.
  • the bearing 4 After fitting it on the shaft la and clamping it in place with the cutting disc 2 and the clamping ring lb, the bearing 4 is thus on one hand, with its inner ring locked between the abutment of the motor shaft and the disc 2 and, on the other hand, with its outer ring being freely rotating.
  • the accessory remains centrally locked and inte ⁇ gral with the motor shaft la, so as to adequately transmit the rotary motion to the cutting disc 2, while it has the support ring 5 in idle condition, which therefore can also remain stationary while the inner ring rotates.
  • the support ring 5 has an external radius which is smaller than the radius of the cutting disc 2 of an extent equal to the working band of the disc, for example of 2-3 cm .
  • the support ring 5 can be used as a support means on the surface of the material to be cut, by causing the blade of the disc 2 to penetrate in the material by a measure equal to the aforementioned working band .
  • the operator no longer having to make the effort to support the motorized device at a certain height, can con ⁇ centrate his intervention and his attention to guide the cutting disc along the specially arranged cutting line.
  • the outer surface of the support ring 5 must preferably have a finish such as not to cause scratches or marks on the finished surface of the material to be cut.
  • the whole support ring 5 can be made of plastic material, for example of a low-friction material such as TeflonTM, or it can be made of metallic material (for example steel or aluminum alloy) coated with a softer material.
  • the periphery of the support ring must have either an anti-abrasion material (such as TeflonTM) or a high friction material surface, so that the support ring does not ideally slide but rather tends to roll, at the advancement of the tool in the cut, without marking the surface.
  • the central hub 60 on which the bearing 4 is mounted has a central hole 61 with a larger diameter than that of the motor shaft la, in particular a hole corresponding to the standard hole of circular blades (for example, with a 22 mm diameter) .
  • the hub 60 can be centred on a standard abutment flange If of the motorized tool.
  • the support accessory according to the invention further comprises a modified clamping flange 62, consisting of a cylindrical centring body 62 ' and a flat head flange 62 ' ' , centrally crossed by a threaded hole 63 adapted to engage with the threaded portion of the motor shaft la.
  • the outer diameter of the cylindrical centring body 62 ' is equal to the central hole 2 of the circular blade 2.
  • the clamping flange 62 acts both as a centring element of the blade 2, acting from the inside of the hole 2a, and as a clamping element of the blade 2 against the hub 60.
  • the cylindrical centring body 62' has a size such that it extends inside the hole 61 of the hub 60, so as to be coupled for a significant length with the threaded portion of the shaft la.
  • the extension of the cylindrical body 62' is nevertheless less than the depth of the hole 61.
  • the support ring 5 has been shown as a separate piece from the bearing 4, it is not excluded that the support ring consists of a circular coating layer of the outer track of the bearing 4 itself.

Abstract

It is disclosed an accessory equipment for a motorized handheld cutting device, comprising a hub to be coupled to a motor body of said device, coaxially to a motor shaft (la), and a supporting surface suitable for resting on a surface of a material to be cut, wherein said hub (6, 60) is integral with an inner ring of a rotating bearing (4) having a central hole adapted to be fitted coaxially on said motor shaft (la) of said motorized cutting device, and in that said supporting surface is constituted by a support ring (5) which is integral in rotation to an outer ring of said rotating bearing (4).

Description

IMPROVED HANDHELD MOTORIZED CUTTING DEVICE AND RELATIVE AC¬ CESSORY
DESCRIPTION
FIELD OF THE INVENTION
The present invention relates to a handheld motorized cutting device or tool, in particular a device with a rotat¬ ing cutting blade, provided with an auxiliary accessory. BACKGROUND ART
As has long been known, in cutting hard materials such as tiles and stone slabs, it is often necessary to use motor rotating blade cutting devices of the handheld type. In par¬ ticular, these devices comprise a freehand gripping motor unit, which carries at its end a free circular blade, gen¬ erally a thin diamond disc, brought into rotation by the motor unit .
The motor unit is inserted into a casing, provided ex¬ ternally with on/off switches, with handles to improve the retention by the operator and possibly with a safety blade protective shield.
This device is light and not bulky, which is much appre¬ ciated because it promotes portability and does not tire the operator. Since it is very easy to use, however, this type of cutting tool lends itself to incorrect use, especially in the precarious conditions of a construction site.
Typically, to make a cut, the tile or stone slab is fixed cantilevered on a support, for example by means of a clamp (or sometimes simply by the pressure of a foot), and then the operator performs cutting by starting the electric motor and bringing the rotating diamond disc to make the cut in the cantilevered part of the material.
The problem presented here - particularly when the cut is longer than a few centimetres - is that the guide of the motorized device, for example along a line previously drawn on the tile surface, is difficult and leads to a not per¬ fectly straight cut. The difficulty is inherent in the fact that the device is relatively light compared to the stresses that are transferred by the rotating blade, it must be sup- ported freehand moving with the whole body and keeping it at a correct distance from the material plane to cut through the whole depth of the slab, but without abutting the surface of the material (because it could cause damage) . Without lateral guidance and without the possibility of support, it is difficult to perform perfectly controlled cuts.
Cutting devices operated freehand by the operator, which provide a support on the surface to be cut, are already available on the market: these are the disc saws for cutting small-thickness timber. These devices include, especially for safety reasons, a cage which - mounted on the casing of the drive motor, centred on the shaft of the toothed disc saw - is provided with an adjustable flat frame, intended to rest on the surface of the wood plane to be cut. This frame, which comprises a cutout through which the disc saw passes, is adjustable in position, so as to predetermine the height of the cutting disc with respect to the material plane.
However, such an arrangement cannot be transferred as it is to the field of cutting of slabs of hard material, because the vibrations of the tool frame would cause unwanted micro- scratches on the finished surface of the slabs. As a conse¬ quence, the motorized tools are still used freehand, in a floating way, with the risk of making cuts that are not perfectly straight and therefore not acceptable for a good finishing job.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an accessory for a handheld, circular blade motor¬ ized cutting device which allows to obtain a considerable improvement, with respect to the prior art, in the execution of perfectly controlled cuts. This object is achieved by the features mentioned in claim 1. The dependent claims describe preferred features of the invention.
In particular, according to a first aspect of the inven¬ tion, an accessory is provided for a motorized and handheld cutting tool, comprising a hub to be coupled to a motor body of said tool, coaxially to a motor shaft, and a supporting surface suitable for resting on a surface of a material to be cut, wherein said hub is integral with an inner ring of a rotating bearing having a central hole adapted to be in¬ serted coaxially on said motor shaft of said motorized cut¬ ting tool, and said supporting surface is constituted by a support ring which is integral in rotation to an outer ring of said rotating bearing.
Advantageously, the axial size of said support ring is lower than the axial size of at least one of said inner ring of the rotating bearing. Preferably, the axial size is less than 1 cm, preferably less than 0.8 cm.
According to a singular aspect, the support ring has at least said peripheral surface made of either an anti-abra¬ sion material or a high-friction soft material.
According to a first variant, the hub has an axial threaded hole and at one end thereof it is provided a cir- cular centring protrusion for a cutting disc.
According to another variant, a clamping flange is also provided, consisting of a cylindrical centring body and a flat head flange, crossed centrally by a threaded hole.
According to another aspect, a handheld motorized cut- ting tool assembly is provided comprising a hand-held casing containing an electric motor provided with a motor shaft, projecting to the outside of the casing, provided with a base abutment surface and a threaded end portion, a cutting disc and a clamping flange being closely locked on said motor shaft, characterized in that an accessory as described above is also closely locked between said clamping flange and said abutment surface.
According to a variant, the clamping flange consists of a cylindrical centring body and a flat head flange, crossed centrally by a threaded hole. Preferably, an outer diameter of the cylindrical centring body is equal to the one of a central hole of said cutting blade.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages of the invention will anyhow be more evident from the following detailed descrip¬ tion, given by mere way of non-limiting example and illus¬ trated in the accompanying drawings, wherein:
fig. 1 is an overall perspective view of a motorized cutting tool provided with the accessory according to a first embodiment of the invention, without a cutting disc;
fig. 2 is a view similar to Fig. 1, with a mounted cutting disc;
fig. 3 is a view similar to that of fig. 2 according to a different perspective;
fig. 4A is a perspective exploded view of the embodiment of fig . 2 ;
fig. 4B is a view similar to that of fig. 4A of a different embodiment of the invention; and
fig. 5 is a perspective exploded view of the accessory according to the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In the appended figures, an accessory according to the invention is well represented in its entirety applied to a cutting device which, as it is known per se, is not illus¬ trated in each single detail.
In fact, a rotary blade handheld cutting device comprises, in a per se known manner, a casing 1, inside which an electric drive motor (not shown in the drawings) is ar¬ ranged which ends with a motor shaft la, on which standard tools are applied.
Typically, the end of the motor shaft la which protrudes out of the casing 1 has a calibrated cylindrical section on which a stop flange is fit, integral in rotation, provided with a cylindrical protrusion which acts as a coupling and centring means for a central hole 2a of a cutting disc 2 (for example a diamond disc) ; the shaft la then terminates with a standard threaded portion, on which a clamping flange lb adapted to hold the cutting disc 2 against the abutment flange is designed to be engaged, so as to prevent any rel¬ ative movement between the disc and the shaft la.
Most of the cutting disc 2 rotates freely overhanging from the motor shaft and only a protective shield 3 is pro¬ vided, on the side facing the operator, to protect against any splinters projected from the disc.
According to the present invention, it is also envisaged to install a support accessory on the motor shaft la, which provides a ring idle with respect to the shaft la, which acts as a support on a surface of the material to be cut.
In particular, the support accessory consists of a bear¬ ing body 4 on whose ring or outer track a support ring or wheel 5 is integral.
The bearing 4 is dimensioned in such a way that it can be fit centred on the shaft la. Preferably, the inner ring or track of the bearing 4 is integral with a hub 6 provided with a central hole, designed to house the threaded end portion of the motor shaft la.
This central hub 6 is coupled to the inner ring of the bearing 4, for example, on one side, with an abutment surface 6a and, on the other, by a Seeger™ circlip 6b.
According to a first embodiment of the invention (Fig. 4A) , the hub 6 has a threaded central hole 6c of a diameter equal to the nominal diameter of the motor shaft la. At one end of the hub 6, manoeuvring holes 6' are also provided.
Moreover, at the end facing the cutting disc 2, the hub 6 has a circular protrusion 6r (visible only in fig. 1) on which the central hole 2a of the cutting disc 2 is centred, typically the hole 2a being of diameter greater than the diameter of the motor shaft la.
For the assembly, the abutment flange (supplied as stand¬ ard equipment of the tool) is removed from the motorized device and, using an appropriate tool (not shown) to act on the holes 6', the hub 6 is tightened strongly against the abutment surface of the motor shaft la.
The support ring 5 integral with the outer ring of the bearing 4 has a modest thickness (axial size) , for example less than 1 cm or preferably 0.8 cm, so that the motor shaft la can pass through the hole 6c and protrude by a sufficient extent (as shown in fig. 1) to be able to still house on its axis both a cutting disc 2, centred on the protrusion 6r, and a relative clamping flange lb (figs. 2 and 3) intended to clamp closely the disc 2 against the hub 6 of the bearing 4, which in turn is integral in rotation with the motor shaft la.
As shown in fig. 1, the hub 6 of the bearing 4 preferably has a width greater than that of the outer ring and of the support ring 5 integral with it, so that the two lateral bearing surfaces of the hub - on one side against the abut- ment surface of the shaft la, on the other side against the cutting disc 2 which is in contact with it - are external to the two laying planes of the outer ring of the bearing and of the support ring 5. In this way, the support ring 5 remains free to rotate idly in close proximity to the side surface of the cutting disc 2.
Due to the modest thickness of the accessory according to the invention, once assembled, the cutting disc 2 is in a position along the motor shaft la not too far from the original design, so as to avoid interference with the pos¬ sible protective shield 3.
After fitting it on the shaft la and clamping it in place with the cutting disc 2 and the clamping ring lb, the bearing 4 is thus on one hand, with its inner ring locked between the abutment of the motor shaft and the disc 2 and, on the other hand, with its outer ring being freely rotating. Ac¬ cordingly, the accessory remains centrally locked and inte¬ gral with the motor shaft la, so as to adequately transmit the rotary motion to the cutting disc 2, while it has the support ring 5 in idle condition, which therefore can also remain stationary while the inner ring rotates.
The support ring 5 has an external radius which is smaller than the radius of the cutting disc 2 of an extent equal to the working band of the disc, for example of 2-3 cm .
With this configuration, the support ring 5 can be used as a support means on the surface of the material to be cut, by causing the blade of the disc 2 to penetrate in the material by a measure equal to the aforementioned working band .
This therefore allows the operator to work equally free¬ hand for guiding cutting, nevertheless placing the support ring 5 of the tool on the surface to be cut in close proximity to the cutting line, due to the fact that the support ring 5 remains idle with respect to the rotation of the cutting disc 2.
So, the operator, no longer having to make the effort to support the motorized device at a certain height, can con¬ centrate his intervention and his attention to guide the cutting disc along the specially arranged cutting line.
For this supporting function, at least the outer surface of the support ring 5 must preferably have a finish such as not to cause scratches or marks on the finished surface of the material to be cut. To this purpose, the whole support ring 5 can be made of plastic material, for example of a low-friction material such as Teflon™, or it can be made of metallic material (for example steel or aluminum alloy) coated with a softer material. To avoid scratching the sur¬ face of the material to be cut, the periphery of the support ring must have either an anti-abrasion material (such as Teflon™) or a high friction material surface, so that the support ring does not ideally slide but rather tends to roll, at the advancement of the tool in the cut, without marking the surface.
For some models of motorized device, in which there is a risk that the accessory according to the invention inter- feres with the protective shield 3 or with the casing 1, it is preferable to keep the standard abutment flange in posi¬ tion. In this case, the thickness of the hub 6 would end up excessively reducing the length of the threaded end of the shaft la.
Therefore, according to an alternative embodiment (fig.
4B) , the central hub 60 on which the bearing 4 is mounted has a central hole 61 with a larger diameter than that of the motor shaft la, in particular a hole corresponding to the standard hole of circular blades (for example, with a 22 mm diameter) . In this way, the hub 60 can be centred on a standard abutment flange If of the motorized tool.
In this case, the support accessory according to the invention further comprises a modified clamping flange 62, consisting of a cylindrical centring body 62 ' and a flat head flange 62 ' ' , centrally crossed by a threaded hole 63 adapted to engage with the threaded portion of the motor shaft la.
The outer diameter of the cylindrical centring body 62 ' is equal to the central hole 2 of the circular blade 2. In this way, the clamping flange 62 acts both as a centring element of the blade 2, acting from the inside of the hole 2a, and as a clamping element of the blade 2 against the hub 60.
The cylindrical centring body 62' has a size such that it extends inside the hole 61 of the hub 60, so as to be coupled for a significant length with the threaded portion of the shaft la. The extension of the cylindrical body 62' is nevertheless less than the depth of the hole 61.
It is to be understood, however, that the invention is not limited to the particular configurations illustrated above, which constitute only non-limiting examples, but that numerous variations are possible, without departing from the scope of the invention as defined by the following claims.
For example, although a cutting tool has always been shown in which the support ring is located between the motor shaft and the cutting disc, it is also possible to foresee - in some working conditions - that the operator prefers to mount the support ring 5 between the clamping flange and the cutting disc 2.
Again, although the support ring 5 has been shown as a separate piece from the bearing 4, it is not excluded that the support ring consists of a circular coating layer of the outer track of the bearing 4 itself.

Claims

1. Accessory equipment for a motorized and handheld cutting device, comprising a hub to be coupled to a motor body of said device, coaxially to a motor shaft (la), and a supporting surface suitable for resting on a surface of a material to be cut, characterized in that said hub (6, 60) is integral with an inner ring of a rotating bearing (4) having a central hole adapted to be fitted coaxially on said motor shaft (la) of said motorized cutting device, and in that said supporting surface is constituted by a support ring (5) which is integral in rotation to an outer ring of said rotating bearing (4) .
2. Accessory equipment as in 1, wherein the axial size of said support ring (5) is lower than the axial size of at least said inner ring of the rotating bearing (4) .
3. Accessory equipment as in 2, wherein said axial size is less than 1 cm, preferably less than 0.8 cm.
4. Accessory equipment as in 1, 2 or 3, wherein said support ring (5) has at least said peripheral surface made of an anti-abrasion material or a high-friction soft mate¬ rial .
5. Accessory equipment as in any one of the preceding claims, wherein said hub (6) has an axial threaded hole (6c) and at one end thereof there is provided a circular centring protrusion (6r) .
6. Accessory equipment according to any one of claims 1-5, wherein a clamping flange (62) is also provided, con¬ sisting of a cylindrical centring body (62') and a flat head flange (62''), crossed centrally by a threaded hole (63) .
7. Handheld motorized cutting tool assembly comprising a hand-held casing (1) containing an electric motor provided with a motor shaft (la), projecting from the outside of the casing, provided with a base abutment surface and a threaded end portion, a cutting disc (2) and a clamping flange being closely locked on said motor shaft (la), characterized in that an accessory equipment as in any of the preceding claims is also locked between said clamping flange (la, 62) and said abutment surface.
8. Tool assembly as in 7, wherein said clamping flange (62) consists of a cylindrical centring body (62') and a flat head flange (62''), crossed centrally by a threaded hole (63) .
9. Tool assembly as in 8, wherein an outer diameter of said cylindrical centring body (62') is equal to a central hole (2a) of said cutting blade (2) .
EP18727424.6A 2017-06-12 2018-04-20 Improved handheld motorized cutting device and relative accessory Active EP3638471B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT201700064845 2017-06-12
PCT/IB2018/052758 WO2018229563A1 (en) 2017-06-12 2018-04-20 Improved handheld motorized cutting device and relative accessory

Publications (2)

Publication Number Publication Date
EP3638471A1 true EP3638471A1 (en) 2020-04-22
EP3638471B1 EP3638471B1 (en) 2022-06-29

Family

ID=62245366

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18727424.6A Active EP3638471B1 (en) 2017-06-12 2018-04-20 Improved handheld motorized cutting device and relative accessory

Country Status (4)

Country Link
EP (1) EP3638471B1 (en)
CN (1) CN111225775B (en)
ES (1) ES2923386T3 (en)
WO (1) WO2018229563A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4171907A1 (en) * 2020-06-25 2023-05-03 Festool GmbH Circular saws with lock assemblies

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2831514A (en) * 1957-02-25 1958-04-22 Avard Paul Machine for slitting the bark of logs
US7156011B2 (en) * 2004-02-25 2007-01-02 The Boeing Company Depth limiting safeguard for channel machining
DE102006001986A1 (en) * 2006-01-16 2007-07-19 Robert Bosch Gmbh Clamping device for releasably securing a disc-shaped tool
JP2010123683A (en) * 2008-11-18 2010-06-03 Nec Electronics Corp Dicing apparatus and adaptor for dicing apparatus
JP6108999B2 (en) * 2013-07-18 2017-04-05 株式会社ディスコ Cutting equipment

Also Published As

Publication number Publication date
CN111225775B (en) 2021-07-13
ES2923386T3 (en) 2022-09-27
EP3638471B1 (en) 2022-06-29
WO2018229563A1 (en) 2018-12-20
CN111225775A (en) 2020-06-02

Similar Documents

Publication Publication Date Title
US4545121A (en) Hand-held power tool with circular-disk-shaped tool
US2238304A (en) Cutting tool
JP6698839B2 (en) Handheld, hand guided cutting device
JP6664484B2 (en) Hand-held, hand-guided cutting device
US6146067A (en) Pipe beveling attachment for a power tool
US20080168667A1 (en) Portable cutting device with guiding guard
US9751139B2 (en) Power tool assembly with integrated tool support fixture
EP1987916B1 (en) A grinding machine and a grinding jig therefore
JP6698840B2 (en) Handheld, hand guided cutting device
US9156182B2 (en) Spring biased base with offset pivot point
EP2753446B1 (en) Miter saw with double belt drive
ATE450351T1 (en) PORTABLE CUTTING TOOL
US4566511A (en) Sander attachment for rotary power saw
US9694508B2 (en) Base lever with release stop and lock stop
EP3638471B1 (en) Improved handheld motorized cutting device and relative accessory
US8776655B2 (en) Worktable for circular saws
US7886640B2 (en) Rotational cutting machine
US20070130782A1 (en) Saw alignment device, blade assembly, and method for cutting a workpiece
US4961287A (en) Wood jointer and planer blade sharpening holder
CA2886733A1 (en) Saw assembly with bevel gear drivetrain
RU2673255C2 (en) Tool rest with angle indicator for use with bench grinder
KR20170058016A (en) Hand type chamfer device for glass
JPH0899Y2 (en) Polishing device for mounting a portable cutting machine
US3129732A (en) Irregular curve cutting saw and edger
US20210187638A1 (en) Portable saw with circular blade

Legal Events

Date Code Title Description
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: UNKNOWN

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE INTERNATIONAL PUBLICATION HAS BEEN MADE

PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20191211

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20220224

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE PATENT HAS BEEN GRANTED

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602018037310

Country of ref document: DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 1501018

Country of ref document: AT

Kind code of ref document: T

Effective date: 20220715

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2923386

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20220927

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG9D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220929

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220930

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220929

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20220629

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 1501018

Country of ref document: AT

Kind code of ref document: T

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221031

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20221029

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602018037310

Country of ref document: DE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20230214

Year of fee payment: 6

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20230223

Year of fee payment: 6

Ref country code: IT

Payment date: 20230215

Year of fee payment: 6

26N No opposition filed

Effective date: 20230330

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230519

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20230502

Year of fee payment: 6

Ref country code: DE

Payment date: 20230214

Year of fee payment: 6

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20230420

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230420

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20230430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230420

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20220629

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230430

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230420

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230430

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20230420