EP3849743A1 - Tronçonneuse guidée à la main - Google Patents

Tronçonneuse guidée à la main

Info

Publication number
EP3849743A1
EP3849743A1 EP19756416.4A EP19756416A EP3849743A1 EP 3849743 A1 EP3849743 A1 EP 3849743A1 EP 19756416 A EP19756416 A EP 19756416A EP 3849743 A1 EP3849743 A1 EP 3849743A1
Authority
EP
European Patent Office
Prior art keywords
spindle
bearing
arm cover
arm
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.)
Granted
Application number
EP19756416.4A
Other languages
German (de)
English (en)
Other versions
EP3849743B1 (fr
Inventor
Helmut Specht
Stefan Teufelhart
Guenther Veik
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.)
Hilti AG
Original Assignee
Hilti AG
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 AG filed Critical Hilti AG
Publication of EP3849743A1 publication Critical patent/EP3849743A1/fr
Application granted granted Critical
Publication of EP3849743B1 publication Critical patent/EP3849743B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/06—Grinders for cutting-off
    • B24B27/08—Grinders for cutting-off being portable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B41/00—Component parts such as frames, beds, carriages, headstocks
    • B24B41/04—Headstocks; Working-spindles; Features relating thereto
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles
    • B25F5/021—Construction of casings, bodies or handles with guiding devices

Definitions

  • the present invention relates to a hand-held power cutter according to the preamble of claim 1.
  • Cut-off machines are hand-held tool devices with a processing tool that is designed in the form of a rotating cutting disc.
  • the essential components of a cut-off machine include a motor housing with a drive unit and a bracket with a support arm and an arm cover, which is fastened to the support arm via fastening elements.
  • the support arm is fixed to the motor housing with a first end and the spindle is fixed to a second end of the support arm by means of a bearing element.
  • the spindle is connected to the drive unit via a transmission device designed as a belt drive.
  • DE 103 25 663 A1 discloses such a hand-held cut-off machine.
  • EP 3 173 188 A1 describes a hand-held cut-off machine that can achieve an increased depth of cut.
  • the support arm must be so compact and in the area of its second end be filigree as possible.
  • a compact and filigree support arm also has the disadvantage that the stability and rigidity of the support arm is reduced. Forces that occur on the cutting disc as a result of machining with the hand-held cut-off machine are transferred to the support arm via the spindle and its bearing elements. The greater the forces that occur on the cutting disc during machining, the greater the load on the support arm.
  • the object of the present invention is to further develop a hand-held cut-off machine in such a way that a compact and filigree support arm can withstand high forces. Damage to the support arm should not occur even with high forces.
  • the hand-held cut-off machine is characterized in that a stop element is provided in the arm cover for the spindle, the stop element limiting the movement of the spindle in a plane perpendicular to the axis of rotation during operation.
  • the stop element makes it possible to divert at least some of the forces that occur into the arm cover during operation of the hand-held cut-off machine and to reduce the load on the support arm in the region of its second end.
  • the spindle moves, which is guided over one or more bearing elements in the support arm.
  • the higher the forces that occur the greater the movement of the spindle in a plane perpendicular to the axis of rotation of the cutting disc, which coincides with the axis of rotation of the spindle.
  • the spindle strikes the stop element, at least some of the forces that occur are transmitted from the spindle to the stop element and passed on from the stop element into the arm cover. Since the arm cover is fastened to the support arm via the fastening elements, the forces are again transmitted from the arm cover to the support arm via the fastening elements.
  • the fastening elements are preferably arranged in robust areas of the arm cover and the support arm.
  • the stop element for the spindle can be integrated in the arm cover or can be designed as a separate insert element which is fitted into a bearing seat in the arm cover or as a bearing element which is fitted into a bearing seat in the arm cover.
  • the bearing seat for the separate insert element and the bearing seat for the bearing element are preferably integrated into the arm cover.
  • the arm cover is preferably made as a casting from a Meta II material. Bearing seats, reinforcing struts and other functional elements can be easily integrated into castings.
  • the support arm has a first bearing seat and a second bearing seat in the region of the second end, a first bearing element being arranged in the first bearing seat and a second bearing element being arranged in the second bearing seat.
  • the spindle is mounted on the support arm via the first bearing element and the second bearing element, which are arranged spaced apart on the support arm.
  • the bearing of the spindle over two spaced apart bearing elements has the advantage over a single bearing element that the tilting moment of the spindle is lower. The greater the distance between the first and second bearing elements, the lower the tilting moment of the spindle.
  • the arm cover is preferably made of a Meta II material.
  • An arm cover made of a Meta II material has the advantage over conventional arm covers made of plastics that, due to the higher modulus of elasticity, forces occurring can be transmitted from the arm cover without the arm cover being damaged.
  • the arm cover is particularly preferably made of a light metal material.
  • Aluminum and magnesium, for example, are suitable as light metal materials.
  • Light metal materials reduce the weight of the arm cover compared to metal materials such as steel.
  • the stop element is designed in the form of an insert element, the insert element being arranged in a bearing seat which is formed in the arm cover.
  • the bearing seat in the arm cover is preferably integrated in the arm cover.
  • the stop element is designed in the form of a further bearing element, the further bearing element being arranged in a bearing seat which is formed in the arm cover.
  • the bearing seat in the arm cover is preferably integrated in the arm cover.
  • the spindle is mounted in the support arm via the first and second bearing element and in the arm cover via a further bearing element.
  • the further bearing element in the arm cover can derive forces from the support arm via the spindle during operation of the hand-held power cutter as a stop element.
  • the first bearing element is particularly preferably designed as a fixed bearing and the further bearing element as a floating bearing for the spindle.
  • the formation of the further bearing element in the arm cover as a floating bearing prevents geometrical over-determination for the spindle in the idle state.
  • the other bearing element is fitted into the bearing seat in the arm cover (press fit) and the arm cover can be pushed onto the spindle with the other bearing element.
  • the arm cover is then attached to the support arm using the fastening elements.
  • FIGN. 1 A, B a hand-held cut-off machine according to the invention with a cutting disc, a motor housing and a boom with a mounted arm cover (FIG. 1A) and a dismantled arm cover (FIG. 1 B);
  • FIGN. 2A, B the arm cover of the boom of FIG. 1A in a view of the inside with a stop element which is designed as an insert element (FIG. 2A) or as a bearing element (FIG. 2B); and
  • FIG. 3 the boom of the in FIG. 1A shown hand-held cut-off machine in a section along the section line A-A in FIG. 1A.
  • FIGN. 1A, B show a hand-held tool device 10 according to the invention, which is designed in the form of a hand-held cut-off machine.
  • the hand-held cut-off machine 10 has a machining tool designed as a cutting disc 11, which is arranged on a spindle 12 and can be rotated about an axis of rotation 13.
  • the hand-held grinder 10 includes a motor housing 14 with a drive unit 15 and a boom 16 with a support arm 17 and an arm cover 18.
  • the arm cover 18 is attached to the fastening elements 19, which can be designed as screws Support arm 17 attached.
  • FIG. 1A shows the hand-held grinder 10 with the arm cover 18
  • FIG. 1B shows the hand-held cut-off machine 10 without the arm cover 18.
  • the cutting disc 11 is driven by the drive unit 15, a transmission device 21 arranged in the arm 16, which in the exemplary embodiment shown is designed as a belt drive, and the spindle 12. All the drive components are summarized under the term “drive unit” which are arranged in the motor housing 14. Arranged in the motor housing 14 is a drive motor (not shown), which in the exemplary embodiment shown is an internal combustion engine, but can also be an electric motor. A centrifugal clutch can be arranged between the drive motor and the belt drive 21, which ensures that the cutting disc 11 does not rotate at low speeds, such as when idling or when starting the hand-held cut-off machine 10; In addition, further transmission components can be arranged between the drive motor and the transmission device 21.
  • the drive motor drives a drive shaft and a drive pulley 22.
  • a transmission element 23 designed as a drive belt is guided over the drive pulley 22 and an output pulley 24 mounted on the spindle 12.
  • the drive pulley 22, the drive belt 23 and the driven pulley 24 form the belt drive 21.
  • the transmission device 21 can be designed, for example, in the form of a chain drive in which the transmission element between the drive pulley 22 and the driven pulley 24 is not a drive belt , but is designed as a chain.
  • the transmission device 21, which connects the spindle 12 to the drive unit 15, is arranged in the boom 16.
  • the arm cover 18 serves, among other things, to cover the rotating components of the transfer device 21 and to reduce the risk of injury that the operator reaches into the rotating components of the transfer device 21 when the hand-held power cutter 10 is in operation.
  • the support arm 17 of the arm 16 is fixed to the motor housing 14 at a first end 25 and the spindle 12 is fixed to a second end 26 of the support arm 17 by means of a bearing element (not shown).
  • the cutting disc 11 is surrounded by a protective hood 27 which serves to protect the operator from dust particles flying around and also reduces the risk of injury that the operator reaches into the rotating cutting disc 11 when the hand-held cutter 10 is in operation.
  • a first handle 28 is provided, which is designed as a top handle and is arranged above the motor housing 14.
  • the first handle can be designed as a rear handle, which is arranged on the side of the motor housing 14 facing away from the cutting disc 11.
  • a second handle 29 is provided for guiding the hand-held cut-off machine 10 and is arranged between the cutting disc 11 and the first handle 28.
  • the second handle 29 is in the embodiment shown in FIGN. 1A,
  • B is designed as a separate handle tube or, alternatively, can be formed in one piece with the motor housing 14.
  • FIGN. 2A, B show the arm cover 18 of the boom 16 of FIG. 1A in a view of the inside with a stop element which is designed as an insert element 31 (FIG. 2A) or as a bearing element 32 (FIG. 2B).
  • the arm cover 18 is part of the arm 16 and is fastened to the support arm 17 by means of the fastening elements 19, which are designed, for example, as screws.
  • the arm cover 18 and the support arm 17 can be produced as cast parts from a metal material, for weight reasons in particular as cast parts from a light metal material.
  • the arm cover 18 has a plurality of reinforcing struts 33.
  • the arm cover In order to limit the movement of the spindle 12 in the plane perpendicular to the axis of rotation 13 during operation, the arm cover is in the region of the second end 18 a stop element is provided.
  • the stop element enables a part of the forces occurring to be diverted into the arm cover 18 during operation of the hand-held cut-off machine 10 and thereby to reduce the load on the support arm 17 in the region of its second end 26.
  • the spindle 12 strikes the stop element, at least some of the forces are transmitted from the spindle 12 to the stop element and transmitted from the stop element into the arm cover 18. Since the arm cover 18 is fastened to the support arm 17 via the fastening elements 19, the forces are transmitted from the arm cover 18 to the support arm 17 again via the fastening elements 19.
  • the arm cover 18 is fastened to the support arm 17 via the fastening elements 19.
  • the forces from the arm cover 18 are also transferred to the support arm 17 via the fastening elements 19.
  • screw domes 34 are provided on the arm cover 18, into which the Screws 19 are screwed in.
  • the screw domes 34 are in particular arranged in such a way that the forces are transferred from the arm cover 18 into robust and stable areas of the support arm 17.
  • FIG. 2A shows the arm cover 18 with a stop element which is designed as an insert element 31.
  • a bearing seat 35 is formed in the arm cover 18, into which the insert element 31 is fitted.
  • the insert element 31 has an inner contour 36, which serves as a stop surface for the spindle 12 in the operation of the hand-held cut-off machine 10 and limits the movement of the spindle 12 in a plane perpendicular to the axis of rotation 13.
  • the materials of the spindle 12 and the insert element 31 can be matched to one another. The adaptation of the materials is particularly important since the spindle 12 is moved about an axis of rotation relative to the insert element 31.
  • FIG. 2B shows the arm cover 18 with a stop element which is designed as a bearing element 32.
  • a bearing seat 37 is formed in the arm cover 18, into which the bearing element 32 is fitted.
  • the bearing element 32 for example in the form of a ball bearing, has the additional advantage that only slight relative movements occur between the spindle 12 and the inside of the ball bearing and wear is further reduced compared to the insert element 31.
  • FIG. 3 shows the arm 16 of the hand-held cut-off machine 10 of FIG. 1A in a section through the spindle 12, a stop element 41 for the spindle 12 being provided in the arm cover 18.
  • the stop element 41 is designed as a bearing element for the spindle 12 and can, for example, by the bearing element 32 of FIG. 2B to be replaced.
  • the hand-held cut-off machine 10 includes the cutting disc 11, the motor housing 14 with the drive unit 15 and the boom 16 with the support arm 17 and the arm cover 18.
  • the cutting disc 11 is fastened on the spindle 12 by means of a flange 42 and is designed to be rotatable about the axis of rotation 13 .
  • the movement of the drive unit 15 is transmitted to the spindle 12 via the drive pulley 22, the drive belt 23 and the driven pulley 24; the driven pulley 24 is arranged on the spindle 12 in a rotationally fixed manner.
  • the spindle 12 is mounted on the support arm 17 via a first bearing element 43 and a second bearing element 44.
  • the support arm 17 has a first bearing seat 45 and a second bearing seat 46 in the region of its second end 26.
  • the first bearing element 43 is fitted into the first bearing seat 45 and the second bearing element 44 into the second bearing seat 46.
  • Bearing the spindle 12 over the spaced-apart first and second bearing elements 43, 44 has the advantage over an individual bearing element that the tilting moment of the spindle 12 is lower. The greater the distance between the first and second bearing elements 43, 44, the smaller the tilting moment of the spindle 12.
  • a bearing seat 47 is provided in the arm cover 18, into which the stop element 41 is fitted.
  • the stop element 41 is designed as a further bearing element for the spindle 12 and is also referred to as a third bearing element.
  • the first bearing element 43 is designed as a fixed bearing for the spindle 12 and the third bearing element 41 is designed as a floating bearing for the spindle 12.
  • the formation of the third bearing element 41 in the arm cover 18 as a floating bearing prevents a geometrical over-determination for the spindle 12 in the idle state of the cut-off machine 10.
  • the third bearing element 41 is fitted into the bearing seat 47 in the arm cover 18 (press fit) and the arm cover 18 can be pushed onto the spindle 12 with the third bearing element 41.
  • the arm cover 18 is then fastened to the support arm 17 by means of the fastening elements 19.
  • the stop element 41 limits the movement of the spindle 12 in a plane 48 perpendicular to the axis of rotation 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sawing (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)

Abstract

Tronçonneuse guidée à la main comprenant un disque de coupe (11), un boîtier de moteur comprenant une unité d'entraînement et une flèche (16) comprenant un bras de support (17 et une couverture de bras (18). Dans la couverture de bras (18), un élément de butée (41) est prévu pour la broche (12), qui limite le mouvement de la broche (12)) dans un plan (48) perpendiculaire à l'axe de rotation (13) durant le fonctionnement.
EP19756416.4A 2018-09-10 2019-08-28 Tronçonneuse guidée à la main Active EP3849743B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP18020443.0A EP3620262A1 (fr) 2018-09-10 2018-09-10 Tronçonneuse guidée à la main
PCT/EP2019/072899 WO2020052974A1 (fr) 2018-09-10 2019-08-28 Tronçonneuse guidée à la main

Publications (2)

Publication Number Publication Date
EP3849743A1 true EP3849743A1 (fr) 2021-07-21
EP3849743B1 EP3849743B1 (fr) 2022-07-06

Family

ID=63557199

Family Applications (2)

Application Number Title Priority Date Filing Date
EP18020443.0A Withdrawn EP3620262A1 (fr) 2018-09-10 2018-09-10 Tronçonneuse guidée à la main
EP19756416.4A Active EP3849743B1 (fr) 2018-09-10 2019-08-28 Tronçonneuse guidée à la main

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP18020443.0A Withdrawn EP3620262A1 (fr) 2018-09-10 2018-09-10 Tronçonneuse guidée à la main

Country Status (3)

Country Link
US (1) US20220048154A1 (fr)
EP (2) EP3620262A1 (fr)
WO (1) WO2020052974A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3670077B1 (fr) * 2018-12-21 2024-05-15 Hilti Aktiengesellschaft Tronçonneuse guidée à la main
EP4140647A1 (fr) * 2021-08-24 2023-03-01 Hilti Aktiengesellschaft Structure profilée pour un composant d'une machine-outil et machine-outil dotée d'une structure profilée
SE545708C2 (en) * 2022-04-04 2023-12-12 Husqvarna Ab A reinforced tool arm for a power cutter

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2367432A (en) * 1941-04-28 1945-01-16 Reprogle Frank Surgical saw
US2344262A (en) * 1943-11-10 1944-03-14 Odierna Ernest Surgical cast cutter
US4599927A (en) * 1985-05-08 1986-07-15 Emerson Electric Co. Tool elevation and bevel adjustment for direct drive power tool
JPH0540926Y2 (fr) * 1986-10-22 1993-10-18
US7121445B2 (en) * 2003-04-22 2006-10-17 Credo Technology Corporation Power tool housing
DE10325663B4 (de) 2003-06-06 2023-03-16 Andreas Stihl Ag & Co. Kg Trennschleifer
DE102004036584B4 (de) * 2004-07-28 2019-08-01 Robert Bosch Gmbh Elektrowerkzeugmaschine
JP2006289571A (ja) * 2005-04-13 2006-10-26 Hitachi Koki Co Ltd 電動工具
US7134209B1 (en) * 2005-05-23 2006-11-14 Molenaar Steven L Disc cutter
JP5760658B2 (ja) * 2011-04-29 2015-08-12 日立工機株式会社 携帯型作業機
DE102013012746A1 (de) * 2013-07-31 2015-02-05 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
JP6248705B2 (ja) * 2014-03-03 2017-12-20 日立工機株式会社 携帯用切断機
DE102014205563A1 (de) * 2014-03-26 2015-10-01 Robert Bosch Gmbh Handgeführte Werkzeugmaschine
AU2014414862B2 (en) * 2014-12-22 2020-10-22 Husqvarna Ab Fastener retention device for a guard cover
EP3173188A1 (fr) 2015-11-25 2017-05-31 HILTI Aktiengesellschaft Tronçonneuse portative manuelle

Also Published As

Publication number Publication date
EP3620262A1 (fr) 2020-03-11
EP3849743B1 (fr) 2022-07-06
US20220048154A1 (en) 2022-02-17
WO2020052974A1 (fr) 2020-03-19

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