EP3638471B1 - Improved handheld motorized cutting device and relative accessory - Google Patents

Improved handheld motorized cutting device and relative accessory Download PDF

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Publication number
EP3638471B1
EP3638471B1 EP18727424.6A EP18727424A EP3638471B1 EP 3638471 B1 EP3638471 B1 EP 3638471B1 EP 18727424 A EP18727424 A EP 18727424A EP 3638471 B1 EP3638471 B1 EP 3638471B1
Authority
EP
European Patent Office
Prior art keywords
cutting
hub
blade
motor shaft
accessory equipment
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.)
Active
Application number
EP18727424.6A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3638471A1 (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
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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
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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 rotating 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, generally a thin diamond disc, brought into rotation by the motor unit.
  • the motor unit is inserted into a casing, provided externally 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 appreciated 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 perfectly 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 supported 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.
  • US2010/0122617 discloses a supporting arrangement for a cutting tool.
  • a cutting blade is mounted directly on a shaft, while a supporting ring is mounted with an inner ring of a rotating bearing directly fit on the same shaft.
  • a similar arrangement is disclosed in US 2005/0183562 .
  • US 2831514 discloses a supporting arrangement for a cutting tool according to the preamble of the main claim.
  • This arrangement includes a hub with an inner smooth hole to be fit on a smooth shaft; the hub is integral in rotation with an inner ring of a bearing; the cutting blade is mounted directly on the shaft.
  • 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 arranged which ends with a motor shaft 1a, on which standard tools are applied.
  • the end of the motor shaft 1a 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 1a then terminates with a standard threaded portion, on which a clamping flange 1b adapted to hold the cutting disc 2 against the abutment flange is designed to be engaged, so as to prevent any relative movement between the disc and the shaft 1a.
  • a cutting disc 2 for example a diamond disc
  • a support accessory on the motor shaft 1a, which provides a ring idle with respect to the shaft 1a, which acts as a support on a surface of the material to be cut.
  • the support accessory consists of a bearing 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 1a.
  • 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 1a.
  • 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 1a. 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 1a.
  • the abutment flange (supplied as standard 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 1a.
  • 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 1a 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 1b ( 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 1a.
  • 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 abutment surface of the shaft 1a, 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 1a not too far from the original design, so as to avoid interference with the possible protective shield 3.
  • the bearing 4 After fitting it on the shaft 1a and clamping it in place with the cutting disc 2 and the clamping ring 1b, 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. Accordingly, the accessory remains centrally locked and integral with the motor shaft 1a, 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 concentrate 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 Teflon TM , 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 Teflon TM ) 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 1a, 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 1a.
  • 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 1a.
  • 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.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
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 EP3638471A1 (en) 2020-04-22
EP3638471B1 true 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 (zh)
CN (1) CN111225775B (zh)
ES (1) ES2923386T3 (zh)
WO (1) WO2018229563A1 (zh)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115734856B (zh) * 2020-06-25 2024-04-12 费斯托工具有限责任公司 具有锁定组件的圆锯

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 (de) * 2006-01-16 2007-07-19 Robert Bosch Gmbh Spannvorrichtung zum lösbaren Befestigen eines scheibenförmigen Werkzeugs
JP2010123683A (ja) * 2008-11-18 2010-06-03 Nec Electronics Corp ダイシング装置およびダイシング装置用のアダプター
JP6108999B2 (ja) * 2013-07-18 2017-04-05 株式会社ディスコ 切削装置

Also Published As

Publication number Publication date
CN111225775A (zh) 2020-06-02
WO2018229563A1 (en) 2018-12-20
ES2923386T3 (es) 2022-09-27
CN111225775B (zh) 2021-07-13
EP3638471A1 (en) 2020-04-22

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