US20210252656A1 - A Protection Arrangement for a Power Tool - Google Patents

A Protection Arrangement for a Power Tool Download PDF

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Publication number
US20210252656A1
US20210252656A1 US17/251,966 US201817251966A US2021252656A1 US 20210252656 A1 US20210252656 A1 US 20210252656A1 US 201817251966 A US201817251966 A US 201817251966A US 2021252656 A1 US2021252656 A1 US 2021252656A1
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US
United States
Prior art keywords
blade guard
cover part
power tool
holding means
hand
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.)
Pending
Application number
US17/251,966
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English (en)
Inventor
Mats Lawenius
Anders Reuterberg
Niklas Sundberg
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Priority to US17/124,049 priority Critical patent/US20210101239A1/en
Assigned to HUSQVARNA AB reassignment HUSQVARNA AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LEWENIUS, MATS, REUTERBERG, ANDERS, SUNDBERG, NIKLAS
Publication of US20210252656A1 publication Critical patent/US20210252656A1/en
Pending legal-status Critical Current

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Classifications

    • 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
    • B23Q11/06—Safety devices for circular cutters
    • 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
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28D—WORKING STONE OR STONE-LIKE MATERIALS
    • B28D1/00—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor
    • B28D1/02—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing
    • B28D1/04—Working stone or stone-like materials, e.g. brick, concrete or glass, not provided for elsewhere; Machines, devices, tools therefor by sawing with circular or cylindrical saw-blades or saw-discs
    • B28D1/045—Sawing grooves in walls; sawing stones from rocks; sawing machines movable on the stones to be cut

Definitions

  • the present disclosure relates to a hand-held power tool comprising a rotatable work tool with a center and a circumference, and being adapted to rotate in a direction of rotation.
  • the power tool further comprises a blade guard arrangement that is arranged to shield a variable part of the rotatable work tool.
  • Many power tools such as power cutters have saw blades in the form of cutting discs which may be circular or ring-shaped.
  • Such a cutting machine may be used for cutting hard materials such as concrete or rock, where the cutting disc is partially covered by a blade guard.
  • a so-called kick-back can occur, where the cutting disc moves both upwards and backwards, towards the user, where the force that causes this movement originates from a locking contact between the cutting disc and a working object in combination with the energy that is stored in the cutting disc's inertia.
  • Such a kick-back can cause injury to a user since the thin and probably rotating cutting disc can hit the user.
  • U.S. Pat. No. 8,413,340 discloses a safety guard assembly for a handheld power saw with a saw blade where, in a kick-back situation, a weight at the safety guard enhances a moment of inertia such that the safety guard is released from a spring-biased locking mechanism.
  • the safety guard consists of two parts that move on opposite sides of the saw blade, away from a central part of the saw blade towards the periphery of the saw blade, by pivoting around a pivot pin. However, the cutting edge of the saw blade will not be covered by the safety guard due to its construction of two parts that move on opposite sides of the saw blade.
  • An object of the present disclosure is to provide a hand-held power cutter comprising a rotatable work tool, where the power tool is adapted for a more flexible use by means of an enhanced protection arrangement. Another object is to provide an improved blade guard arrangement.
  • a hand-held power tool comprising a rotatable work tool with a center and a circumference and being adapted to rotate in a certain direction of rotation.
  • the power tool further comprises a blade guard arrangement that is arranged to shield a variable part of the rotatable work tool and comprises a blade guard and a swiveling cover part that is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • the swiveling cover part In a first position, the swiveling cover part is positioned such that a first arc of a circle is covered, where the first arc of a circle follows the blade guard and runs an angular distance along the circumference after the blade guard, in the direction of rotation.
  • the cover part is moveable between the first position and a second position where a cutting operation of the rotatable work tool along the first arc of a circle is allowed.
  • the cover part is biased in the direction of rotation, towards the first position by means of a biasing member.
  • This provides user protection along that part first arc of a circle that is not comprised I a work object in, which is an advantage. This is advantageous in the case of a kick-back condition. This also enables a more flexible use by means of an enhanced protection arrangement.
  • a second arc of a circle is adjacent to the first arc of a circle and runs an angular distance along the circumference after the first arc of a circle in the direction of rotation.
  • the second arc of a circle is uncovered in the first position such that initial cutting is allowed along the second arc of a circle.
  • the blade guard arrangement comprises a continuously running delimiting contact part against which a work object at least partly can rest during cutting of the work object.
  • the cover part can move between the first position and the second position by means of pressure from the work object against said contact part, the pressure working against the biasing.
  • the contact part is either comprised in the cover part or comprised in a part connecting the cover part to the blade guard.
  • This provides a safe support for the work object that can move the cover part during cutting in a reliable manner.
  • each holding means is pivotably attached to the swiveling cover part and the blade guard at its respective ends, and adapted to move relative the blade guard when the cover part is moved between the first position and the second position.
  • the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • Each holding means is in the form of a guide attached to the blade guard and is adapted to run in a corresponding arcuate slot in the cover part.
  • the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • Each holding means is in the form of a pivot pin attached to the blade guard where the cover part is adapted to pivot around the pivot pin.
  • the cover part is connected to the blade guard such that it is moveable along a path between the first position and the second position, where the path mainly follows the circumference such that a part of the blade guard is radially positioned between the circumference and the cover part in the second position.
  • the cover part adjusts to the present work procedure in a discrete manner, enabling versatile work.
  • the swiveling cover part is spring-biased towards the first position along at least a part of the path, the spring bias being accomplished by means of at least one spring element that constitutes said biasing means.
  • each spring element is attached to the blade guard and a corresponding holding means end, and the holding means end is attached to the blade guard by means of a pivot pin.
  • the spring element is biased such that the cover part strives towards the first position along at least a part of the path.
  • the bias is accomplished in a reliable and uncomplicated manner.
  • the spring element has a winding part and two arm parts which are attached to the blade guard and the corresponding holding means end at corresponding arm attachments.
  • a first line passing the arm attachments never passes a second line, where the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the first position along the path.
  • the spring element has a winding part and two arm parts which are attached to the blade guard and the corresponding holding means end at corresponding arm attachments.
  • a first line passing the arm attachments passes a second line when brought to the second position, where the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the second position along a part of the path.
  • the winding part is adapted to move when the cover part is moved between the first position and the second position such that the force needed to move the cover part is reduced from the first position to the second position.
  • This provides a smooth movement from the first position to the second position.
  • the spring element comprises a spiral spring that is attached to the blade guard and the corresponding holding means end at corresponding spring attachments.
  • a first line passing the spring attachments passes a second line when brought to the second position.
  • the second line is parallel to the first line and runs via the pivot pin, such that the cover part is spring-biased towards the second position along a part of the path.
  • the cover part comprises a handle that admits a user to move the cover part between the first position and the second position.
  • the blade guard comprises a lock part that is adapted for releasably locking the cover part in the second position.
  • the blade guard is adapted to rotate in the direction of rotation, where the rotation is caused by the mass of the blade guard in combination with an acceleration.
  • the blade guard comprises a weight
  • the cover part comprises a wheel that is adapted to be in rotatable contact with a work object during cutting.
  • This provides easy cutting, when the cover part is moved by means of the work object.
  • the cover part at least partly is made as a see-through structure.
  • a hand-held power tool comprising a rotatable work tool having a center and a circumference and that is adapted to rotate in a certain direction of rotation.
  • the power tool further comprises a blade guard arrangement that at least partly is arranged to shield a part of the rotatable work tool and comprises a blade guard and a protective arrangement that is adapted to be displaced from a working position, where the protective arrangement admits normal cutting of a work object, to a displaced position.
  • the protective arrangement In the displaced position, the protective arrangement at least partly becomes positioned such that a first arc of a circle is covered, where the first arc of a circle follows the blade guard, and runs an angular distance along the circumference after the blade guard, in the direction of rotation.
  • the displacement is caused by the mass of the protective arrangement in combination with an acceleration.
  • the blade guard comprises a protective part that constitutes the protective arrangement, where the blade guard is adapted to rotate around the center in the direction of rotation.
  • the protective part comprises a weight.
  • the protective arrangement mostly covers a part of the blade guard in the working position and is adapted to be displaced to the displaced position along a path mostly following the direction of rotation.
  • the protective arrangement a swiveling cover part that is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • each holding means is pivotably attached to the swiveling cover part and the blade guard, and is adapted to move relative the blade guard when the cover part is moved between the first position and the second position.
  • the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • Each holding means is in the form of a guide attached to the blade guard and is adapted to run in a corresponding arcuate slot in the cover part.
  • the cover part is attached to the blade guard by means of at least one holding means comprised in the blade guard arrangement.
  • Each holding means is in the form of a pivot pin attached to the blade guard where the cover part is adapted to pivot around the pivot pin.
  • the cover part is connected to the blade guard such that it is moveable along a path between the first position and the second position, where the path mainly follows the circumference such that a part of the blade guard is radially positioned between the circumference and the cover part in the second position.
  • the cover part adjusts to the present work procedure in a discrete manner, enabling versatile work.
  • the swiveling cover part is spring-biased by means of at least one spring element, where each spring element is attached to the blade guard and a corresponding holding means end.
  • the holding means end is attached to the blade guard by means of a pivot pin and the spring element is biased such that the cover part strives towards the working position along a part of the path and towards the displaced position along the rest of the path.
  • the spring element has a winding part and two arm parts which are attached to the blade guard and the corresponding holding means end at corresponding arm attachments.
  • a first line passing the arm attachments passes a second line when brought to the working position, where the second line is parallel to the first line and runs via the pivot pin.
  • the winding part is adapted to move when the cover part is moved between the working position and the displaced position such that the force needed to move the cover part is reduced from the working position to the displaced position.
  • This provides a smooth movement from the first position to the second position.
  • the spring element comprises a spiral spring that is attached to the blade guard and the corresponding holding means end at corresponding spring attachments.
  • a first line passing the spring attachments passes a second line when brought to the displaced position, where the second line is parallel to the first line and runs via the pivot pin.
  • the protective arrangement comprises an airbag that is adapted to be inflated and expand to the displaced position.
  • the airbag is adapted expand from the blade guard and to partly be positioned between the circumference and the blade guard after inflation, such that the movement of the rotatable work tool is reduced.
  • FIG. 1 shows a side view of a hand-held power cutter with a protective arrangement according to a first example in a first position
  • FIG. 2 shows a side view of a hand-held power cutter with a protective arrangement according to the first example in a second position
  • FIG. 3 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the first example in the first position;
  • FIG. 4 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the first example in the second position
  • FIG. 5 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the first example in the first position
  • FIG. 6 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to a second example in the first position
  • FIG. 7 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the second example in the second position
  • FIG. 8 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to a third example in the first position
  • FIG. 9 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the third example in the second position
  • FIG. 10 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to a fourth example in the first position
  • FIG. 11 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement according to the fourth example in the second position
  • FIG. 12A shows a side view of a first type of spring element in one position
  • FIG. 12B shows a side view of the spring element in another position
  • FIG. 13 shows a side view of the spring element in two positions
  • FIG. 14 shows a side view of a hand-held power cutter with a protective arrangement according to a fifth example in a normal position
  • FIG. 15 shows a side view of a hand-held power cutter with a protective arrangement according to the fifth example in a displaced position
  • FIG. 16 shows a side view of a first type of spring element
  • FIG. 17A shows a side view of a second type of spring element in one position
  • FIG. 17B shows a side view of the spring element in another position
  • FIG. 18 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement being biased towards one position by means of the second type of spring element;
  • FIG. 19 shows a side view of a cutting disc and a blade guard arrangement with a protective arrangement being biased towards another position by means of the second type of spring element;
  • FIG. 20 shows a side view of a hand-held power cutter with a protective arrangement according to a sixth example in a displaced position
  • FIG. 21 shows a side view of a hand-held power cutter with a protective arrangement according to a seventh example in a displaced position.
  • FIG. 1 and FIG. 2 shows respective side views of a hand-held power cutter 1 according to a first example with a circularly shaped saw blade, constituting a cutting disc 2 , for example suitable to cut through concrete.
  • the cutting disc 2 has a center 16 and a circumference 17 (only schematically indicated).
  • the power cutter 1 comprises a casing 3 at least partly enclosing a combustion engine 4 , where the casing 3 in turn comprises a first handle part 5 .
  • the power cutter 1 further comprises a second handle part 7 that runs in an arcuate shape over the casing 3 , the second handle part 7 being attached to the casing 3 .
  • the power cutter 1 comprises a blade guard 8 that is arranged to shield a part of the cutting disc 2 .
  • the cutting disc 2 is adapted to rotate in a direction of rotation 19 and is connected to the engine 4 via a power transferring unit 27 that comprises a power transferring means (not shown) that is covered by a power transfer cover 10 .
  • the power transferring means is according to some aspects either in the form of an endless drive belt or a geared transmission that in turn is arranged to propel the cutting disc 2 .
  • the direction of rotation 19 runs clockwise in a side view where the cutting disc 2 is positioned at the right of the engine 4 .
  • the power cutter 1 further comprises a blade guard arrangement 8 that is arranged to shield a variable part of the cutting disc 2 , where the blade guard arrangement 8 comprises a blade guard 12 .
  • the blade guard arrangement 8 further comprises a swiveling cover part 11 that is attached to the blade guard 12 .
  • the cover part 11 In a first position, as illustrated in FIG. 1 , the cover part 11 is positioned such that a first arc A of a circle is covered, where the first arc A of a circle is adjacent to the blade guard 12 and runs an angular distance along the circumference 17 after the blade guard 12 in the direction of rotation 19 .
  • the cover part 11 is arranged moveable between the first position and a second position, as illustrated in FIG. 2 , where a cutting operation of the cutting disc 2 along the first arc A of a circle is allowed, where the cover part 11 is biased in the direction of rotation 19 , towards the first position.
  • the cover part 11 When the cover part 11 is covering the first arc A of a circle in the first position, the circumference 17 is covered, and a user U is protected from the edge of the circumference 17 where it is covered by the cover part 11 .
  • the first arc A of a circle at least follows the blade guard 12 and runs an angular distance along the circumference 17 after the blade guard 12 in the direction of rotation 19 , allowing a gap to be present between the cover part 11 and the blade guard 12 , at which gap a part of the cutting disc 2 can be visible. According to some aspects, there is no such gap.
  • a second arc B of a circle that is adjacent to the first arc A of a circle and runs an angular distance along the circumference 17 after the first arc A of a circle in the direction of rotation 19 .
  • the second arc B of a circle is uncovered in the first position such that initial cutting is allowed along the second arc B of a circle.
  • a user U is stimulated to start cutting along the second arc B of a circle, which provides a safe and preferred initial cutting.
  • the arcs A, B of a circle have the same or similar radial extension as the circumference 17 .
  • FIG. 3 showing a side view of the cutting disc 2 and the cover part 11 in the first position
  • FIG. 4 showing a side view of the cutting disc 2 and the cover part 11 in the second position.
  • the cover part 11 is attached to the blade guard 12 by means of holding rods comprised in the blade guard arrangement 8 ; a first holding rod 21 and a second holding rod 22 .
  • Each holding rod 21 , 22 is pivotably attached to the swiveling cover part 11 and the blade guard 12 at its respective ends, and is adapted to move relative the blade guard 12 when the cover part 11 is moved between the first position and the second position. In this manner, the pivoting functionality is maintained by being used every time the power cutter 1 is used, preventing dirt from obscuring the pivoting functionality.
  • the cover part 11 is connected to the blade guard 12 such that it is moveable along a path between the first position and the second position, where the path mainly follows the circumference 17 such that a part of the blade guard 12 is radially positioned between the circumference 17 and the cover part 11 , 11 ′, 11 ′′ in the second position.
  • the holding rods 21 , 22 are arranged such that the cover part 11 moves along said path, and in this example without any parts being attached at the center 16 .
  • the swiveling cover part 11 is spring-biased towards the first position along at least a part of the path, the spring bias being accomplished by means of at least one spring element 33 .
  • the spring element 33 is attached to the blade guard 12 and a corresponding holding rod end 22 a associated with the second holding rod 22 .
  • the holding rod end 22 a is attached to the blade guard 12 by means of a pivot pin 13 .
  • the spring element is biased such that the cover part 11 strives towards the first position along at least a part of the path; two different examples will be described in the following.
  • the spring element 33 has a winding part 34 and two arm parts 35 , constituting a first type of spring element, which arm parts 35 are attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding arm attachments 42 a , 42 b .
  • a first imaginary line 43 passing the arm attachments 42 a , 42 b never passes a second imaginary line 44 , where the second line 44 is parallel to the first line 43 and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the first position along the path.
  • a distance A, B between the lines 43 , 44 always exceeds zero. This means that the cover part 11 always is spring-biased towards the first position.
  • the spring element 33 has a winding part 34 and two arm parts 35 , being the first type of spring element, which arm parts 35 are attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding arm attachments 42 a ′, 42 b ′.
  • a first imaginary line 43 ′ passing the arm attachments 42 a ′, 42 b ′ passes a second imaginary line 44 ′ when brought to the second position, where the second line 44 ′ is parallel to the first line 43 ′ and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the second position along a part of the path.
  • a distance C between the lines 43 ′, 44 ′ changes sign.
  • the cover part 11 mainly is spring-biased towards the first position, but also is spring-biased towards the second position in the vicinity of the second position. This means that the cover part 11 can be set in the second position, but easily be brought back to the first position by moving it slightly away from the second position and then letting the spring force act.
  • the winding part 34 is adapted to move when the cover part 11 is moved between the first position and the second position such that the force of the spring bias is reduced the first position to the second position.
  • An example of how the spring element 33 functions is also illustrated in FIG. 1 - FIG. 4 .
  • the spring element 41 comprises a spiral spring, constituting a second type of spring element, that is attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding spring attachments 45 a , 45 b .
  • a first imaginary line 46 passing the spring attachments 45 a , 45 b passes a second imaginary line 47 when brought to the second position.
  • the second line 47 is parallel to the first line 46 and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the second position along a part of the path.
  • a distance D, E between the lines 46 , 47 changes sign.
  • the cover part 11 mainly is spring-biased towards the first position, but also is spring-biased towards the second position in the vicinity of the second position.
  • the cover part 11 can be fixedly set in the second position, but easily be brought back to the first position by moving it slightly away from the second position and then letting the spring force act.
  • FIG. 18 and FIG. 19 which mainly correspond to FIG. 4 and FIG. 3 .
  • FIG. 18 and FIG. 19 are also used for illustrating a further example of the present disclosure as will be discussed later.
  • an additional corresponding spring element attached to an additional corresponding holding rod end on the other side of the blade guard arrangement 8 , not shown in FIG. 1 - FIG. 4 , FIG. 12A , FIG. 12B , FIG. 13 , FIG. 16 , FIG. 17A , FIG. 17B , FIG. 18 and FIG. 19 .
  • FIG. 5 that corresponds to FIG. 3 , another example is shown.
  • the spring element 33 , 41 is covered by a covering plate 31 .
  • the covering plate is according to some aspects adapted to receive an incoming water supply hose 49 , and thus also adapted to cover or comprise water dispensing means (not shown) adapted to dispense water that is intended to connect to dust that is released during cutting, preventing the dust to spread.
  • the second holding rod 22 also constitutes a continuously running delimiting contact part against which a work object 18 at least partly can rest during cutting of the work object 18 .
  • the cover part 11 can move between the first position and the second position by means of pressure from the work object 18 against the contact part of the second holding rod 22 , where this pressure works against the biasing. In this manner, the work object 18 will not be caught or stuck anywhere while pressing against the contact part and moving the cover part 11 between the first position and the second position.
  • the cover part 11 comprises a wheel 25 that is adapted to be in rotatable contact with a work object 18 during cutting.
  • an end portion of the second holding rod 22 comprises the wheel 25 that is adapted to be in rotatable contact with a work object 18 during cutting.
  • FIG. 6 shows a side view of a cutting disc 2 and a blade guard arrangement 8 ′ with a protective arrangement according to a second example in the first position
  • FIG. 7 shows a corresponding side view in the second position.
  • first holding arm 21 ′ is sandwiched between an arcuate second holding arm 22 ′ and the blade guard 12 , where the second holding arm 22 ′ in this example also constitutes a contact part according to the above, i.e. a continuously running delimiting contact part against which a work object 18 at least partly can rest during cutting of the work object 18 .
  • additional holding arms corresponding to the holding arms 21 ′, 22 ′ on the other side of the blade guard arrangement 8 ′, which holding arms are not showed in FIG. 6 and FIG. 7 .
  • FIG. 8 shows a side view of a cutting disc 2 and a blade guard arrangement 8 ′′ with a protective arrangement according to a third example in the first position
  • FIG. 9 shows a corresponding side view in the second position.
  • the cover part 11 ′′ is attached to the blade guard 12 ′′ by means of a holding pin 37 comprised in the blade guard arrangement 8 ′′.
  • the holding pin 37 is in the form of a guide attached to the blade guard 12 ′′ and is adapted to run in a corresponding arcuate slot 38 in the cover part 11 ′′.
  • the cover part 11 ′′ has a somewhat pie-shaped structure in this example and comprises a front edge 36 that constitutes a contact part according to the above, i.e. a continuously running delimiting contact part against which a work object 18 at least partly can rest during cutting of the work object 18 .
  • the front edge 36 runs on both sides of the cutting disc 2 .
  • FIG. 10 shows a side view of a cutting disc 2 and a blade guard arrangement 8 ′′′ with a protective arrangement according to a fourth example in the first position
  • FIG. 11 shows a corresponding side view in the second position.
  • the cover part 11 ′′′ is attached to the blade guard 12 ′′′ by means of at least one pivot pin 39 that is comprised in the blade guard arrangement 8 ′′′ and is attached to the blade guard 12 ′′′, where cover part 11 ′′′ is adapted to pivot around the pivot pin 39 .
  • the pivot pin is slightly offset from the center 16 . According to some aspects, there is an additional corresponding pivot pin on the other side of the blade guard arrangement 8 ′′′, not shown in FIG. 10 and FIG. 11 .
  • the examples described with reference to FIG. 8-11 can be combined such that the cover part 11 ′′ is attached to the blade guard 12 ′′ by means of a holding pin 37 comprised in the blade guard arrangement 8 ′′ and is adapted to run in a corresponding arcuate slot 38 in the cover part 11 ′′ on one side.
  • the cover part 11 ′′′ is attached to the blade guard 12 ′′′ by means of at least one pivot pin 39 that is comprised in the blade guard arrangement 8 ′′′ and is attached to the blade guard 12 ′′′, where cover part 11 ′′′ is adapted to pivot around the pivot pin 39 .
  • the cover part 11 ′′′ that has a somewhat pie-shaped structure in this example and comprises a front edge 40 that constitutes a contact part according to the above, i.e. a continuously running delimiting contact part against which a work object 18 at least partly can rest during cutting of the work object 18 .
  • the front edge 40 runs on both sides of the cutting disc 2 .
  • the cover part is spring biased by one or more spring elements; where applicable by means of spring elements similar to the ones as discussed previously.
  • the cover part 11 , 11 ′, 11 ′′, 11 ′′′ comprises a handle 30 that admits a user to move the cover part 11 between the first position and the second position.
  • the blade guard 12 comprises a lock part 48 that is adapted for releasably locking the cover part 11 in the second position, the lock part 48 for example comprising a magnet.
  • a spring-loaded member can be adapted to engage a locking member.
  • the cover part 11 , 11 ′, 11 ′′, 11 ′′′ at least partly is made as a see-through structure.
  • a see-through structure can for example be a certain material such as clear plastics.
  • Other alternatives for such a see-through structure are nets/grid structures or a material with see-through apertures or holes.
  • the previously described second position is here a working position, as shown in FIG. 14
  • the previously described first position is here a displaced position, as shown in FIG. 15 .
  • the blade guard arrangement 8 a comprises a blade guard 12 and a protective arrangement 23 that is adapted to be displaced from a working position, where the protective arrangement 23 admits normal cutting of a work object 18 , to a displaced position such that the protective arrangement 23 in the displaced position at least partly becomes positioned such that a first arc A 1 of a circle is adjacent to, or at least follows, the blade guard 12 and runs an angular distance along the circumference 17 after the blade guard 12 in the direction of rotation 19 .
  • the displacement is caused by the mass of the protective arrangement in combination with an acceleration, and can for example be initiated by means of a kick-back condition.
  • the blade guard 12 comprises a protective part 23 that constitutes the protective arrangement, where the blade guard 12 is adapted to rotate around the center 16 in the direction of rotation 19 should an acceleration according to the above occur.
  • the protective part 23 comprises a weight 24 , and thus the blade guard 12 also comprises the weight 24 .
  • the moveable blade guard can suitably be rotated in any direction around the center 16 by hand as well, and in that case by means of a handle 50 .
  • the protective part can instead, or as a complement, comprise the cover part 11 , 11 ′, 11 ′′, 11 ′′′ as discussed previously, as illustrated for a blade guard arrangement 8 b in FIG. 18 and FIG. 19 .
  • FIG. 18 shows side view of a cutting disc and a blade guard arrangement with a protective arrangement being biased towards the working position by means of the second type of spring element
  • FIG. 19 shows a corresponding side view with a protective arrangement being biased towards the displaced position by means of the second type of spring element.
  • the swiveling cover part 11 is spring-biased by means of a spring element 41 that is attached to the blade guard 12 and a corresponding holding means end 22 a , and where the holding means end 22 a is attached to the blade guard 12 by means of a pivot pin 13 .
  • the spring element is biased such that the cover part 11 strives towards the working position along a part of the path and towards the displaced position along the rest of the path, where said part of the path is shorter than the rest of the path. This allows the cover part 11 to be held in the working position while working, and to be quickly displaced to the displaced position should an acceleration according to the above occur.
  • a biasing means as previously described with reference to FIG. 16 is also conceivable since it achieves this desired functionality.
  • the blade guard arrangement 8 c , 8 d comprises a protective arrangement that in turn comprises an airbag 29 , 32 that is adapted to be inflated and expand to the displaced position.
  • FIG. 20 there is a blade guard arrangement 8 c that comprises an airbag generator 51 from which an airbag 28 has been deployed, covering a certain arc A 2 of a circle.
  • the airbag 28 is intended as a protection as well as a brake, the airbag 28 being adapted to expand from the blade guard 12 and to partly be positioned between the circumference 17 and the blade guard 12 after inflation, such that the movement of the rotatable work tool 2 is reduced.
  • FIG. 21 there is a blade guard arrangement 8 d that comprises an airbag generator 52 from which an airbag 29 has been deployed, covering a certain arc A 3 of a circle.
  • the airbag 29 is mainly intended as a protection.
  • the protective arrangement 11 , 23 , 28 , 29 mostly covers a part of the blade guard 12 in the working position and is adapted to be displaced to the displaced position along a path mostly following the direction of rotation 19 .
  • the present disclosure is not limited to the above examples, but may vary freely within the scope of the appended claims.
  • a rotatable work tool such as a circular cutting disc, or a ring-shaped saw blade. Only some items of the power cutter in the example have been described, the power cutter in itself being of a well-known kind.
  • the engine 4 can either be a combustion engine or an electric motor, as well as a hydraulic or pneumatic engine/motor.
  • the blade guard 12 is adapted to rotate around the center 16 , and in particular in the direction of rotation 19 , where the rotation is caused by the mass of the blade guard 12 in combination with an acceleration.
  • the blade guard 12 comprises a weight 24 .
  • holding means The rod parts, arm parts, holding pins and pivot pins described are all generally referred to as holding means. As described, there can be one or more holding means.
  • the circumference 17 can be regarded as an imaginary circumference that follows an outer edge of the rotatable work tool 2 .
  • the blade guard arrangement 8 comprises a blade guard 12 that is adapted to partly cover said circumference 17 .
  • the power cutter is generally constituted by a power tool comprising a rotatable work tool.
  • the protective arrangement comprises a brake that is adapted to reduce the movement of the rotatable work tool 2 during certain conditions.
  • the present disclosure relates to a hand-held power tool 1 comprising a rotatable work tool 2 with a center 16 and a circumference 17 and being adapted to rotate in a certain direction of rotation 19 , where the power tool 1 further comprises a blade guard arrangement 8 that is arranged to shield a variable part of the rotatable work tool 2 .
  • the blade guard arrangement 8 comprises a blade guard 12 and a swiveling cover part 11 , 11 ′, 11 ′′ that is attached to the blade guard 12 by means of at least one holding means 21 , 22 ; 21 ′, 22 ′ comprised in the blade guard arrangement 8 , and, in a first position, the swiveling cover part 11 , 11 ′, 11 ′′ is positioned such that a first arc A of a circle is covered, where the first arc A of a circle follows the blade guard 12 , and runs an angular distance along the circumference 17 after the blade guard 12 , in the direction of rotation 19 , where the cover part 11 is moveable between the first position and a second position where a cutting operation of the rotatable work tool 2 along the first arc A of a circle is allowed, where the cover part 11 , 11 ′, 11 ′′ is biased in the direction of rotation 19 , towards the first position by means of a biasing member.
  • the present disclosure also relates to a blade guard arrangement 8 that is arranged to shield a variable part of a rotatable work tool 2 for a hand-held power tool 1 along a circumference 17 , where the blade guard arrangement 8 comprises a blade guard 12 that is adapted to partly cover said circumference 17 .
  • the blade guard arrangement 8 comprises a swiveling cover part 11 , 11 ′, 11 ′′ that is attached to the blade guard 12 by means of at least one holding means 21 , 22 ; 21 ′, 22 ′ comprised in the blade guard arrangement 8 , and, in a first position, is positioned such that a first arc A of a circle is covered, where the first arc A of a circle follows the blade guard 12 , and runs an angular distance along the circumference 17 after the blade guard 12 , in an intended direction of rotation 19 for the rotatable work tool 2 , where the cover part 11 is moveable between the first position and a second position where a cutting operation of the rotatable work tool 2 along the first arc A of a circle is allowed, where the cover part 11 , 11 ′, 11 ′′ is biased in the direction of rotation 19 , towards the first position by means of a biasing member.
  • a second arc B of a circle is adjacent to the first arc A of a circle and runs an angular distance along the circumference 17 after the first arc A of a circle in the direction of rotation 19 , where the second arc B of a circle is uncovered in the first position such that initial cutting is allowed along the second arc B of a circle.
  • the blade guard arrangement 8 , 8 ′, 8 ′′, 8 ′′′ comprises a continuously running delimiting contact part 22 , 36 , 40 against which a work object 18 at least partly can rest during cutting of the work object 18 , such that during cutting, the cover part 11 , 11 ′, 11 ′′, 11 ′′′ can move between the first position and the second position by means of pressure from the work object against said contact part 22 , 36 , 40 , the pressure working against the biasing, where the contact part either is comprised in the cover part 11 ′′, 11 ′′′ or comprised in a part 22 , 22 ′ connecting the cover part 11 , 11 ′ to the blade guard 12 .
  • each holding means 21 , 22 ; 21 ′, 22 ′ at its respective ends being pivotably attached to the swiveling cover part 11 , 11 ′ and the blade guard 12 , and adapted to move relative the blade guard 12 when the cover part 11 is moved between the first position and the second position.
  • the cover part 11 ′′ is attached to the blade guard 12 ′′ by means of at least one holding means 37 comprised in the blade guard arrangement 8 ′′, each holding means 37 being in the form of a guide attached to the blade guard 12 ′′ and being adapted to run in a corresponding arcuate slot 38 in the cover part 11 ′′.
  • the cover part 11 ′′′ is attached to the blade guard 12 ′′′ by means of at least one holding means 39 comprised in the blade guard arrangement 8 ′′′, each holding means 39 being in the form of a pivot pin attached to the blade guard 12 ′′′ where the cover part 11 ′′′ is adapted to pivot around the pivot pin 39 .
  • the cover part 11 , 11 ′, 11 ′′, 11 ′′′ is connected to the blade guard 12 such that it is moveable along a path between the first position and the second position, where the path mainly follows the circumference 17 such that a part of the blade guard 12 is radially positioned between the circumference 17 and the cover part 11 , 11 ′, 11 ′′, 11 ′′′ in the second position.
  • the swiveling cover part 11 , 11 ′, 11 ′′ is spring-biased towards the first position along at least a part of the path, the spring bias being accomplished by means of at least one spring element 33 , 41 that constitutes said biasing means.
  • each spring element 33 , 41 is attached to the blade guard 12 and a corresponding holding means end 22 a and where the holding means end 22 a is attached to the blade guard 12 by means of a pivot pin 13 , the spring element being biased such that the cover part 11 strives towards the first position along at least a part of the path.
  • the spring element 33 has a winding part 34 and two arm parts 35 which are attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding arm attachments 42 a , 42 b , where a first line 43 passing the arm attachments 42 a , 42 b never passes a second line 44 , where the second line 44 is parallel to the first line 43 and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the first position along the path.
  • the spring element 33 has a winding part 34 and two arm parts 35 which are attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding arm attachments 42 a ′, 42 b ′, where a first line 43 ′ passing the arm attachments 42 a ′, 42 b ′ passes a second line 44 ′ when brought to the second position, where the second line 44 ′ is parallel to the first line 43 ′ and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the second position along a part of the path.
  • the winding part 34 is adapted to move when the cover part 11 is moved between the first position and the second position such that the force needed to move the cover part 11 , 11 ′, 11 ′′ is reduced from the first position to the second position.
  • the spring element 41 comprises a spiral spring that is attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding spring attachments 45 a , 45 b , where a first line 46 passing the spring attachments 45 a , 45 b passes a second line 47 when brought to the second position, where the second line 47 is parallel to the first line 46 and runs via the pivot pin 13 , such that the cover part 11 is spring-biased towards the second position along a part of the path.
  • the cover part 11 comprises a handle 30 that admits a user to move the cover part 11 between the first position and the second position.
  • the blade guard 12 comprises a lock part 48 that is adapted for releasably locking the cover part 11 in the second position.
  • the blade guard 12 is adapted to rotate in the direction of rotation 19 , where the rotation is caused by the mass of the blade guard 12 in combination with an acceleration.
  • the blade guard 12 comprises a weight 24 .
  • the cover part 11 comprises a wheel 25 that is adapted to be in rotatable contact with a work object 18 during cutting.
  • the cover part 11 at least partly is made as a see-through structure.
  • the present disclosure also relates to a hand-held power tool 1 comprising a rotatable work tool 2 having a center 16 and a circumference 17 and being adapted to rotate in a certain direction of rotation 19 , where the power tool 1 further comprises a blade guard arrangement 8 , 8 a , 8 b , 8 c , 8 d that at least partly is arranged to shield a part of the rotatable work tool 2 .
  • the blade guard arrangement 8 comprises a blade guard 12 and a protective arrangement 11 , 23 , 28 , 29 that is adapted to be displaced from a working position, where the protective arrangement 11 , 23 , 28 , 29 admits normal cutting of a work object 18 , to a displaced position such that the protective arrangement 11 , 23 , 28 , 29 in the displaced position at least partly becomes positioned such that a first arc A 1 , A 2 , A 3 of a circle is covered, where the first arc A 1 , A 2 , A 3 of a circle follows the blade guard 12 , and runs an angular distance along the circumference 17 after the blade guard 12 , in the direction of rotation 19 .
  • the present disclosure also relates to a blade guard arrangement 8 that is arranged to shield a variable part of a rotatable work tool 2 for a hand-held power tool 1 along a circumference 17 , where the blade guard arrangement 8 comprises a blade guard 12 that is adapted to partly cover said circumference 17 .
  • the blade guard arrangement 8 comprises a protective arrangement 11 , 23 , 28 , 29 that is adapted to be displaced from a working position, where the protective arrangement 11 , 23 , 28 , 29 is adapted to admit normal cutting of a work object 18 , to a displaced position such that the protective arrangement 11 , 23 , 28 , 29 in the displaced position at least partly becomes positioned such that a first arc A 1 , A 2 , A 3 of a circle is covered, where the first arc A 1 , A 2 , A 3 of a circle follows the blade guard 12 , and runs an angular distance along the circumference 17 after the blade guard 12 , in an intended direction of rotation 19 for the rotatable work tool 2 ,
  • the displacement is caused by the mass of the protective arrangement in combination with an acceleration.
  • the blade guard 12 comprises a protective part 23 that constitutes the protective arrangement, where the blade guard 12 is adapted to rotate around the center 16 in the direction of rotation 19 .
  • the protective part 23 comprises a weight 24 .
  • the protective arrangement 11 , 23 , 28 , 29 mostly covers a part of the blade guard 12 in the working position and is adapted to be displaced to the displaced position along a path mostly following the direction of rotation 19 .
  • the protective arrangement a swiveling cover part 11 , 11 ′, 11 ′′ that is attached to the blade guard 12 by means of at least one holding means 21 , 22 ; 21 ′, 22 ′ comprised in the blade guard arrangement 8 , 8 b , wherein each holding means 21 , 22 ; 21 ′, 22 ′ at its respective ends being pivotably attached to the swiveling cover part 11 , 11 ′ and the blade guard 12 , and adapted to move relative the blade guard 12 when the cover part 11 is moved between the first position and the second position.
  • the cover part 11 ′′ is attached to the blade guard 12 ′′ by means of at least one holding means 37 comprised in the blade guard arrangement 8 ′′, each holding means 37 being in the form of a guide attached to the blade guard 12 ′′ and being adapted to run in a corresponding arcuate slot 38 in the cover part 11 ′′.
  • the cover part 11 ′′′ is attached to the blade guard 12 ′′′ by means of at least one holding means 39 comprised in the blade guard arrangement 8 ′′′, each holding means 39 being in the form of a pivot pin attached to the blade guard 12 ′′′ where the cover part 11 ′′′ is adapted to pivot around the pivot pin 39 .
  • the cover part 11 , 11 ′, 11 ′′, 11 ′′′ is connected to the blade guard 12 such that it is moveable along a path between the first position and the second position, where the path mainly follows the circumference 17 such that a part of the blade guard 12 is radially positioned between the circumference 17 and the cover part 11 , 11 ′, 11 ′′ in the second position.
  • the swiveling cover part 11 is spring-biased by means of at least one spring element 33 , 41 , where each spring element 33 , 41 is attached to the blade guard 12 and a corresponding holding means end 22 a and where the holding means end 22 a is attached to the blade guard 12 by means of a pivot pin 13 , the spring element 33 , 41 being biased such that the cover part 11 strives towards the working position along a part of the path and towards the displaced position along the rest of the path.
  • the spring element 33 has a winding part 34 and two arm parts 35 which are attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding arm attachments 42 a ′, 42 b ′, where a first line 43 ′ passing the arm attachments 42 a ′, 42 b ′ passes a second line 44 ′ when brought to the working position, where the second line 44 ′ is parallel to the first line 43 ′ and runs via the pivot pin 13 .
  • the winding part 34 is adapted to move when the cover part 11 is moved between the working position and the displaced position such that the force needed to move the cover part 11 is reduced from the working position to the displaced position.
  • the spring element 41 comprises a spiral spring that is attached to the blade guard 12 and the corresponding holding means end 22 a at corresponding spring attachments 45 a , 45 b , where a first line 46 passing the spring attachments 45 a , 45 b passes a second line 47 when brought to the displaced position, where the second line 47 is parallel to the first line 46 and runs via the pivot pin 13 .
  • the protective arrangement comprises an airbag 28 , 29 that is adapted to be inflated and expand to the displaced position.
  • the airbag 28 is adapted expand from the blade guard 12 and to partly be positioned between the circumference 17 and the blade guard 12 after inflation, such that the movement of the rotatable work tool 2 is reduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US17/251,966 2018-07-02 2018-07-02 A Protection Arrangement for a Power Tool Pending US20210252656A1 (en)

Priority Applications (1)

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US17/124,049 US20210101239A1 (en) 2018-07-02 2020-12-16 Protection Arrangement for a Power Tool

Applications Claiming Priority (1)

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PCT/SE2018/050721 WO2020009625A1 (en) 2018-07-02 2018-07-02 A protection arrangement for a power tool

Related Parent Applications (1)

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PCT/SE2018/050721 A-371-Of-International WO2020009625A1 (en) 2018-07-02 2018-07-02 A protection arrangement for a power tool

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US17/124,049 Continuation US20210101239A1 (en) 2018-07-02 2020-12-16 Protection Arrangement for a Power Tool

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US (1) US20210252656A1 (de)
EP (1) EP3787825B1 (de)
JP (1) JP7128962B2 (de)
CN (1) CN112368097B (de)
AU (1) AU2018431008B2 (de)
CA (1) CA3102533A1 (de)
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CN115625800B (zh) * 2022-10-25 2023-09-26 天元建设集团有限公司 一种建筑水电安装用开槽设备

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Publication number Publication date
CN112368097A (zh) 2021-02-12
CN112368097B (zh) 2023-09-12
WO2020009625A1 (en) 2020-01-09
EP3787825B1 (de) 2024-06-12
AU2018431008B2 (en) 2021-11-18
EP3787825A4 (de) 2021-12-08
CA3102533A1 (en) 2020-01-09
AU2018431008A1 (en) 2020-12-17
JP7128962B2 (ja) 2022-08-31
JP2021529118A (ja) 2021-10-28
EP3787825A1 (de) 2021-03-10

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