WO2020200859A1 - Scie circulaire - Google Patents

Scie circulaire Download PDF

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Publication number
WO2020200859A1
WO2020200859A1 PCT/EP2020/057910 EP2020057910W WO2020200859A1 WO 2020200859 A1 WO2020200859 A1 WO 2020200859A1 EP 2020057910 W EP2020057910 W EP 2020057910W WO 2020200859 A1 WO2020200859 A1 WO 2020200859A1
Authority
WO
WIPO (PCT)
Prior art keywords
saw blade
saw
circular
blade guard
mounting ring
Prior art date
Application number
PCT/EP2020/057910
Other languages
English (en)
Inventor
See Seng Chai JACK
Alex KOH
Heaven ZHU
Zhi Lin
Original Assignee
Hilti Aktiengesellschaft
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 Hilti Aktiengesellschaft filed Critical Hilti Aktiengesellschaft
Publication of WO2020200859A1 publication Critical patent/WO2020200859A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/006—Accessories specially designed for sawing machines or sawing devices for removing or collecting chips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/16—Hand-held sawing devices with circular saw blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/08—Protective coverings for parts of machine tools; Splash guards
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws

Definitions

  • the present invention relates to an electric tool, in particular to a handheld circular saw.
  • Circular saws are widely used for cutting workpieces, such as wood, metal and many other materials.
  • a circular saw generally comprises a rotating saw blade assembly and a drive unit which are disposed in a housing, a handle disposed on the housing, and a base or support plate which comes into contact with a workpiece during a cutting operation, as well as an upper protective cover and a moveable saw blade guard.
  • the upper protective cover and the moveable saw blade guard generally cover the entire periphery of a saw blade, except for a front end which initially contacts the workpiece to be cut.
  • the saw blade of the circular saw is mounted on a saw blade shaft in a fixed manner by means of a mounting flange, a clamping flange and clamping screws.
  • the drive unit drives the saw blade shaft to rotate, and the saw blade rotates with the saw blade shaft, thereby cutting the workpiece.
  • the saw blade guard is generally used to protect a user from being hurt by the saw blade. In a non-operational state of the circular saw, the saw blade guard is in a closed position, and almost surrounds a lower half periphery of the saw blade, thereby avoiding accidental harm due to a sharp edge of the saw blade coming into contact with the user.
  • the saw blade guard In an operational state of the circular saw, the saw blade guard is biased towards the closed position around a lower part of the saw blade by means of a tensile elastic element or torsional elastic element.
  • a tensile elastic element or torsional elastic element When the user pushes the circular saw forwards to perform cutting, the workpiece comes into contact with a front edge of the saw blade guard, thereby generating a torque that is opposite to and greater than the torque of the tensile elastic element or torsional elastic element, which causes the saw blade guard to rotate towards an open position; thus, in the process of the workpiece being cut by the saw blade, the saw blade guard can prevent a rear side of the saw blade rotating at high speed from accidentally coming into contact with the user, and at the same time protects the user from being hurt by chips scattered from the workpiece due to the cutting of the saw blade.
  • the saw blade guard is pivotably mounted to a bearing cover of the saw blade shaft of the circular saw by means of a mounting ring, and when the saw blade guard moves from the closed position to the open position, the mounting ring pivots around the bearing cover; there is an appropriate gap, not a tight fit, between an inner diameter of the mounting ring and an outer diameter of the bearing cover.
  • the saw blade produces large amounts of flying chips and dust in a cutting toolprocess; thus, although many circular saws are equipped with dust accumulation means, a small amount of dust or flying chips will still fall into the gap between the mounting ring of the saw blade guard and an outer peripheral face of the bearing cover, and this will result in a safety hazard, as dust, once accumulated to a certain degree, will affect the normal rebound of the saw blade guard or the biasing thereof to the closed position.
  • the present invention has been created in view of the above situation, with the objective of providing a handheld circular saw, comprising a housing, a drive unit, a saw blade shaft connected to the drive unit and a bearing cover surrounding the saw blade shaft, and a saw blade guard, the saw blade shaft being constructed so as to be capable of supporting a saw blade for the circular saw and defining a rotation axis, the saw blade guard comprising a mounting ring, the mounting ring defining a circular opening and surrounding the bearing cover, and the saw blade guard being capable of rotating around the rotation axis between a closed position and an open position; an inner side of the circular opening of the mounting ring of the saw blade guard is provided with at least one slot.
  • multiple said slots are provided, arranged at uniform intervals on an inner peripheral face of the circular opening.
  • the slot is substantially a radial cutout extending in the circumferential direction of the circular opening on the inner peripheral face of the circular opening.
  • a cross section of the cutout is substantially a rectangle or parallelogram.
  • the rectangular or parallelogram shaped slots arranged uniformly on the peripheral face of the circular opening can be machined and formed simply and conveniently, facilitating manufacture.
  • the slot is a narrow slot arranged obliquely on the inner peripheral face of the circular opening.
  • the oblique narrow slot is more helpful in expelling chips.
  • the narrow slot may be in the form of a straight line, or a curved line, or a bent line.
  • a handheld circular saw comprises a housing, a drive unit, a saw blade shaft connected to the drive unit and a bearing cover surrounding the saw blade shaft, and a saw blade guard, the saw blade shaft being constructed so as to be capable of supporting a saw blade for the circular saw and defining a rotation axis, the saw blade guard comprising a mounting ring, the mounting ring defining a circular opening and surrounding the bearing cover, the saw blade guard being capable of rotating around the rotation axis between a closed position and an open position, and a number of protrusions being provided in the circular opening of the mounting ring of the saw blade guard.
  • the protrusions are of equal height and uniformly arranged on an inner surface of the circular opening.
  • the protrusions may be in the form of bosses, or ribs, or protruding points.
  • Fig. 1 shows a perspective view of a handheld circular saw according to the present invention.
  • Fig. 2 is an exploded perspective view of the handheld circular saw according to the present invention shown in fig. 1.
  • Fig. 3 is a partial schematic diagram showing the connection and mounting of a saw blade, saw blade guard, drive unit and saw blade shaft of a circular saw of the present invention.
  • Fig. 4 shows a perspective view of a demonstrative saw blade guard of a circular saw of the present invention.
  • Fig. 5 shows a perspective view of another demonstrative saw blade guard of a circular saw of the present invention.
  • Fig. 6 shows a perspective view of a saw blade guard of another demonstrative circular saw of the present invention.
  • Fig. 7 shows an alternative schematic embodiment of a slot of a lower guard saw blade of the present invention.
  • a handheld circular saw according to an embodiment of the present invention is described below with reference to figs. 1 - 7.
  • the present invention relates to a circular saw used for forming an opening in an object being machined; the circular saw is widely used for cutting workpieces such as wood, vinyl siding and many other materials, including pieces of metal.
  • FIG. 1 An electric handheld circular saw 1 is shown in figs. 1 and 2; the handheld circular saw 1 comprises a housing 10, handles 11 and 12 for a user to grip, a housing-supported drive unit 20 in the housing 10, a support plate 15 and a saw blade 16, an upper protective cover 17, and a saw blade guard 18.
  • the housing 10 may be formed of metal or plastic, such that the housing 10 is very sturdy and lightweight.
  • the circular saw 1 comprises a front handle 11 and a rear handle 12, which are individually supported on the housing 10 and constructed so as to be grippable by a user of the circular saw 1 during a cutting operation.
  • the rear handle 12 comprises a trigger switch (not shown) which is operably connected to an electric motor.
  • the circular saw 1 may not comprise the front handle 11.
  • the upper protective cover 17 is supported by the housing 10 and is fixed in a suitable position relative to the housing 10.
  • the support plate 15 is pivotably connected to the housing 10, and constructed so as to be capable of supporting the housing 10 and the drive unit 20 above a workpiece W during a cutting operation.
  • a lower surface of the support plate 15 forms a workpiece support face; the saw blade 16 extends through a gap in the support plate 15 and is partially surrounded by the upper protective cover 17 in an arc shape.
  • the handheld circular saw 1 can be placed onto a workpiece to be machined, and guided along a surface of the workpiece. If necessary, the saw blade 16 may also be tilted relative to the support plate 11 , in order to allow oblique cutting to be carried out.
  • the arrow 19 indicates the direction of rotation of the saw blade 16.
  • the circular saw of the present invention comprises a drive unit 20, which may be powered by a battery (not shown) shown in this embodiment, but of course could also be powered through a corded power source as is well known in the art.
  • the drive unit 20 comprises a drive electric motor 201 , a drive shaft 202, a drive bearing 203 and a bearing block 204; the drive bearing 203 surrounds the drive shaft 202, and is mounted in the bearing block 204.
  • the circular saw further comprises a saw blade shaft 23, with a bearing cover 24 surrounding the saw blade shaft 23; the bearing cover 24 may be connected to the bearing block 204 in a fixed manner by means of screws, and the saw blade shaft 23 is constructed so as to be capable of supporting the saw blade 16 for the circular saw and defines a rotation axis 25.
  • the saw blade shaft 23 is connected to the drive shaft by means of a gearbox (not shown).
  • the gearbox comprises multiple gears (not shown) which are operably connected to the electric motor 20 and the saw blade shaft 23.
  • the gearbox is constructed so as to be capable of reducing a rotation speed of an output (not shown) of the electric motor to a speed suitable for turning the saw blade 16.
  • the gearbox may also comprise a worm transmission apparatus (not shown) for driving the saw blade shaft 16; in fact, the drive unit of the circular saw 1 may comprise a transmission apparatus of any type.
  • the saw blade guard 18 is rotatably mounted to the housing 10 of the circular saw 1.
  • the saw blade guard 18 is constructed so as to be capable of rotating from a closed position to an open position around a rotation axis 25.
  • the circular saw 1 further comprises a biasing member (not shown) such as a torsional elastic element; the biasing member is constructed so as to be capable of biasing the saw blade guard 18 towards the closed position.
  • the saw blade guard 18 comprises a lower wall 180 and, an inside wall 181 and an outside wall 182 individually extending from the lower wall 180.
  • the lower wall 180 has a substantially circular contour and is adapted to a periphery of the saw blade 16, thereby protecting the saw blade 16 from damage and also protecting the user from accidental contact with the saw blade 16.
  • the lower wall 180 extends from a front edge part 183 to a rear edge part 184.
  • the front edge 183 should be slightly lower than the workpiece support face when in a mounted position.
  • An inner arc-shaped side edge and an outer arc-shaped side edge of the lower wall 180 extend upwards substantially perpendicularly to form the inside wall 181 and the outside wall 182.
  • the inside wall 181 is substantially fan-shaped, and a mounting ring 185 is included at the centre of the fan shape thereof, the mounting ring 185 defining a circular opening 186; the saw blade shaft 23 and the bearing cover 24 extend through the circular opening 186.
  • a centre point 187 of the opening 186 is coincident and aligned with the rotation axis 25.
  • the saw blade guard 18 pivots around the centre point 187 from the closed position to the open position.
  • the saw blade guard 18 may be made of cast aluminium or moulded plastic, and the surface thereof is mostly flat; preferably, the surface may be covered with a wear-resistant material plate (e.g. stainless steel).
  • a wear- resistant material plate e.g. stainless steel
  • At least one slot 188 is provided in the circular opening 186 of the mounting ring 185 of the saw blade guard 18. Due to the slot 188, when the circular opening 186 of the saw blade guard mounting ring is mounted on the bearing cover 24, a surface of contact between an inner surface of the circular opening 186 and an outer ring surface of the bearing cover 24 is reduced, helping to reduce wear during rotation of the saw blade guard, and at the same time, since a gap formed by the slot can form an accumulation reservoir or a dust accumulation zone, in order to temporarily accommodate dust and chips produced in the course of circular saw cutting, and the dust and chips can be expelled as the saw blade guard rotates or vibrates, the possibility of the saw blade guard being unable to normally rotate and rebound to the closed position is considerably reduced, ensuring the stability of normal operation of the circular saw and improving the safety of the circular saw in use.
  • multiple said slots 188 are provided, arranged at uniform intervals on an inner peripheral face of the circular opening 186, in order to achieve a better result in terms of clear dust accumulation.
  • the slot 188 is substantially a radial cutout extending along the circular opening on the inner peripheral face of the circular opening 186 of the mounting ring, i.e. the slot 188 is a gap formed on the inner peripheral face of the circular opening; the gap is radial in order to temporarily accommodate dust and chips produced in the course of cutting.
  • the slot extends circumferentially in the circular opening, such that the function of removal by sweeping can be realized to a certain degree during rotation of the saw blade guard, and dust and chips can be expelled from the guard as the saw blade guard rotates.
  • the slot is a narrow slot 189 arranged obliquely on the inner peripheral face of the circular opening.
  • the oblique narrow slot is more helpful in expelling chips.
  • the narrow slot may be in the form of a straight line, or a curved line, or a bent line.
  • the shape of the narrow slot is non-limiting; a suitable shape is selected mainly on the basis of overall consideration of convenience of machining and manufacture and a better dust removal result.
  • the term“slot” should not be interpreted with any restrictive meaning, i.e. the width may be quite wide, e.g. in an embodiment of the present invention, the width of the slot is substantially equal to the length of the slot, and the width of the slot may even be greater than the length of the slot, e.g. a cross section of the cutout may be substantially formed as a rectangle or parallelogram.
  • the distance between two adjacent slots may also be defined according to particular application conditions, e.g. when used in a circular saw which mainly cuts workpieces that do not produce a particularly large amount of dust, the width of the slots may be smaller, or the distance between slots may be larger, for convenience of machining.
  • the width of the slot may be designed to be larger, or the distance between adjacent slots may be smaller, in order to better realize the functions of dust accumulation and removal.
  • the term“slot” or“narrow slot” should ultimately be appropriate.
  • the slot or narrow slot may have a desired depth, e.g. 3 - 5 mm.
  • a handheld circular saw comprises a housing, a drive unit, a saw blade shaft connected to the drive unit and a bearing cover surrounding the saw blade shaft, and a saw blade guard, the saw blade shaft being constructed so as to be capable of supporting a saw blade for the circular saw and defining a rotation axis, the saw blade guard comprising a mounting ring, the mounting ring defining a circular opening and surrounding the bearing cover, the saw blade guard being capable of rotating around the rotation axis between a closed position and an open position, and a number of protrusions being provided in the circular opening of the mounting ring of the saw blade guard.
  • the protrusions have the same function as the slots; a slot is in fact formed between two adjacent protrusions, and so the solution whereby protrusions are disposed in the circular opening can similarly help to reduce wear during rotation of the saw blade guard.
  • a gap formed between the protrusions can form an accumulation reservoir or a dust accumulation zone, in order to temporarily accommodate dust and chips produced in the course of circular saw cutting, and the dust and chips can be expelled as the saw blade guard rotates or vibrates, thereby considerably reducing the possibility of the saw blade guard being unable to normally rotate and rebound to the closed position, ensuring the stability of normal operation of the circular saw and improving the safety of the circular saw in use.
  • the protrusions are of equal height and uniformly arranged on an inner surface of the circular opening.
  • the protrusions may be in the form of protruding faces, or ribs, or protruding points.
  • shape, arrangement and parameters such as height of the protrusions, these should not be interpreted with any restrictive meaning, but are defined according to particular application conditions, preferably such that machining is convenient while the functions of good dust accumulation and removal are achieved.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne une scie circulaire portative (1) qui comprend un boîtier (10), une unité d'entraînement (20), un arbre de lame de scie (16, 23) relié à l'unité d'entraînement (20) et à un couvercle de palier (24) entourant l'arbre de lame de scie (16, 23), et une protection de lame de scie (18). L'arbre de lame de scie (16, 23) est conçu de manière à pouvoir supporter une lame de scie (16) pour la scie circulaire (1) et définit un axe de rotation (25). La protection de lame de scie (18) comprend une bague de montage (185), la bague de montage (185) définissant une ouverture circulaire (186) et entourant le couvercle de palier (24). La protection de lame de scie (18) est apte à tourner autour de l'axe de rotation (25) entre une position fermée et une position ouverte. Un côté interne de l'ouverture circulaire (186) de la bague de montage (185) de la protection de lame de scie (18) est pourvu d'au moins une fente (188) ou de saillies. La présente invention aide à réduire l'usure pendant la rotation de la protection de lame de scie (18). Parallèlement, étant donné qu'un espace de la fente (188) ou des saillies peut former un réservoir d'accumulation, pour recevoir temporairement la poussière et les copeaux produits au cours de la découpe et les expulser de manière opportune, la stabilité de fonctionnement normal de la scie circulaire (1) est assurée et la sécurité de la scie circulaire (1) en cours d'utilisation est améliorée.
PCT/EP2020/057910 2019-04-04 2020-03-23 Scie circulaire WO2020200859A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910268238.5A CN111774654A (zh) 2019-04-04 2019-04-04 圆锯
CN201910268238.5 2019-04-04

Publications (1)

Publication Number Publication Date
WO2020200859A1 true WO2020200859A1 (fr) 2020-10-08

Family

ID=70058319

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2020/057910 WO2020200859A1 (fr) 2019-04-04 2020-03-23 Scie circulaire

Country Status (2)

Country Link
CN (1) CN111774654A (fr)
WO (1) WO2020200859A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2409820A1 (fr) * 2010-07-22 2012-01-25 Makita Corporation Outils de découpe dotés de structures de montage à couvercle amovible

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1908549B1 (fr) * 2006-10-07 2010-02-17 Metabowerke GmbH Outil motorisé portatif, en particulier une meuleuse d'angle, avec un capot protecteur
US20090223069A1 (en) * 2008-03-05 2009-09-10 Back & Decker Inc. Lower blade guard
US20160121513A1 (en) * 2014-10-30 2016-05-05 Robert Bosch Tool Corporation Lower Blade Guard for a Circular Saw
US11007586B2 (en) * 2016-12-28 2021-05-18 Koki Holdings Co., Ltd. Portable cutter
CN208262881U (zh) * 2018-03-09 2018-12-21 南京德朔实业有限公司 电圆锯

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2409820A1 (fr) * 2010-07-22 2012-01-25 Makita Corporation Outils de découpe dotés de structures de montage à couvercle amovible

Also Published As

Publication number Publication date
CN111774654A (zh) 2020-10-16

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