EP0521259B1 - Tragbare Werkzeugmaschine - Google Patents

Tragbare Werkzeugmaschine Download PDF

Info

Publication number
EP0521259B1
EP0521259B1 EP92107613A EP92107613A EP0521259B1 EP 0521259 B1 EP0521259 B1 EP 0521259B1 EP 92107613 A EP92107613 A EP 92107613A EP 92107613 A EP92107613 A EP 92107613A EP 0521259 B1 EP0521259 B1 EP 0521259B1
Authority
EP
European Patent Office
Prior art keywords
clamping
machine tool
tool according
fork
securing element
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.)
Expired - Lifetime
Application number
EP92107613A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0521259A1 (de
Inventor
Hans Hermann Rottmerhusen
Boris Rudolf
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.)
C&E Fein GmbH and Co
Original Assignee
C&E Fein GmbH and Co
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
Priority claimed from DE19914122320 external-priority patent/DE4122320A1/de
Priority claimed from DE19914134072 external-priority patent/DE4134072A1/de
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP0521259A1 publication Critical patent/EP0521259A1/de
Application granted granted Critical
Publication of EP0521259B1 publication Critical patent/EP0521259B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B25F3/00—Associations of tools for different working operations with one portable power-drive means; Adapters 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
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools

Definitions

  • the invention relates to a portable machine tool, in particular an angle grinder, with a motor for driving a tool via an angular gear, with a hollow spindle, at one end of which the tool can be fastened between two flanges, with a clamping bolt, via which the tool can be clamped in a rotationally fixed manner, and with a securing element for the rotationally fixed securing of the tool with a manually operable clamping device which can be moved against the force of at least one elastic element between a clamping position in which the tool is clamped in the axial direction and a release position in which the tool is relieved for manual change , and wherein the elastic element is arranged between an axial fixed stop and an axially displaceable stop.
  • An angle grinder of this type is known from DE 34 05 885 C1, in which the grinding tool can be clamped in a rotationally fixed manner by means of a quick-action clamping device without the aid of an additional tool.
  • the known angle grinder is driven by a motor via an angular gear, by which a grinding spindle is driven.
  • a clamping bolt is arranged axially displaceably within the grinding spindle, which is designed as a hollow spindle, and the grinding wheel is received between two flanges at the grinding wheel end.
  • the clamping bolt can be moved axially between a clamping position and a release position against the force of spring elements via a manually operable clamping device. In the release position, the clamping bolt is axially displaced in the direction of the grinding wheel. This relieves the pressure on the outer flange, which is screwed onto a threaded pin of the clamping bolt on the grinding wheel side, so that it can be unscrewed from the threaded pin for changing the grinding wheel without the aid
  • the clamping device After changing the grinding wheel and after manually screwing the outer flange onto the threaded pin, the clamping device is brought into the clamping position by turning the clamping lever. As a result, the clamping bolt is axially displaced so that the grinding wheel is clamped in a rotationally fixed manner between the two flanges under the action of the spring elements.
  • the grinding tool is fixed on the tool side by screwing the outer flange onto the threaded pin.
  • the operator can slip easily, which can result in injuries to the sharp grinding wheel.
  • the invention is therefore based on the object of providing a portable machine tool in which the clamping of various tools is readily possible without additional aids and in which the risk of injury is reduced.
  • this object is achieved in a portable hand tool of the type mentioned in that the securing element is provided on the side of the clamping bolt facing away from the tool, and in that the securing element is acted upon by the displaceable stop in the clamping position in order to rotate the tool to secure.
  • any tools can be clamped between the two flanges without the use of an additional tool. It is also possible to use cranked tools, brush tools, etc., since the tool is only frictionally clamped between two flanges, the outer flange being provided on the tool-side end of the clamping bolt.
  • the securing element is positively secured in the clamping position.
  • the displaceable stop is sleeve-shaped and arranged coaxially on the hollow spindle.
  • the spring elements which are supported on one side on the fixed stop, are enclosed by the sleeve-shaped, displaceable stop on the other side, so that the seat of the spring elements is defined at the same time.
  • the securing element can be designed as a clamping nut which can be screwed onto a thread of the clamping bolt.
  • the clamping nut can be screwed onto the thread without the aid of a tool, whereupon the clamping device is brought into the clamping position, whereby the tool is clamped in a rotationally fixed manner.
  • the clamping device is brought back into the release position.
  • the clamping nut can now be unscrewed from the thread of the clamping bolt and the clamping bolt can be pulled out of the hollow spindle so that the tool can be removed.
  • the clamping bolt is put through its central opening again and fastened at its other end by screwing on the clamping nut. Then the Bring the clamping device into the clamping position, whereby the tool is clamped in a rotationally fixed manner between the two flanges and at the same time the clamping nut is positively secured in the clamping position.
  • the form-fitting securing can be achieved in a simple manner in that the displaceable stop and the securing element have a spur toothing, whereby the securing element is positively secured when it rests on the displaceable stop.
  • the securing element can be positively secured to the clamping bolt by means of a bayonet catch.
  • the bayonet lock can be locked in various axial positions.
  • the axial locking positions are expediently matched to the different tool thicknesses specified by standardization.
  • bayonet pitch grooves are provided on the clamping bolt, which are connected for locking by a locking pin via an axial groove.
  • the securing element can be designed in a simple manner as a knurled knob, from which the locking pin protrudes radially.
  • the tensioning device has a tension fork which is rotatably mounted about a fixed axis of rotation and which acts with its free fork ends on the displaceable stop for axial displacement.
  • the displaceable stop which is preferably arranged coaxially on the hollow spindle, can be axially displaced in a simple manner by rotating the clamping fork.
  • the clamping device can have a clamping fork which is rotatably mounted on its two fork ends on a fixed axis of rotation and acts with its central region on the displaceable stop for axial displacement.
  • relief of the securing element is achieved when the common end of the clamping fork opposite the two fork ends is displaced in the direction of the tool.
  • the relief of the securing element takes place in the aforementioned embodiment when the common end of the tension fork is moved in the opposite direction.
  • rolling elements for reducing friction are provided on the contact surface between the clamping fork and the displaceable stop.
  • a clamping lever can be provided, by means of which the common end of the clamping fork facing away from the axis of rotation can be displaced in the axial direction.
  • the clamping lever can have a long lever end for actuation, which is rotatably mounted on the housing via a pin and is connected to a short lever end, via which the common end of the clamping fork can be displaced when the clamping lever is actuated.
  • the clamping lever is rotatably attached to the housing via an eccentric, which acts on the common end of the clamping fork via an axially movable pressure piece for axial displacement.
  • the clamping fork is additionally lifted from the displaceable stop by a spring in the clamping position.
  • the clamping lever in the second embodiment can be stored outside the housing, since the clamping lever is actuated by the eccentric of the clamping lever via the axially displaceable pressure piece becomes.
  • the storage of the tension lever outside the housing has the advantage that sealing problems when sealing the gearbox to the outside are reduced.
  • the sealing of the transmission housing to the outside is improved in that a seal is arranged between the fixed stop and the housing.
  • the clamping device is expediently designed so that the axial displacement path between the clamping position and the release position is at least so large that when the frictional connection between the tool and the flanges in the release position is removed, the stroke of the form-fitting securing of the securing element can also be overcome.
  • the positive locking preferably has a stroke that is as short as possible, for which purpose a fine ribbing can be provided, for example, in the case of a spur toothing, for example a 64 division.
  • the clamping lever can be locked with its free end on the housing in the clamping position.
  • This measure has the advantage that accidental actuation or release of the tensioning lever is reliably avoided.
  • the free end of the tensioning lever is designed to protrude outward from the housing.
  • This measure has the advantage that the tensioning lever can be better gripped at its free end in the tensioning position in which the tensioning lever is folded against the housing.
  • the clamping device ensures a non-rotatable clamping of the tool in the clamping position via friction.
  • a positive locking of the clamping bolt on the hollow spindle can be provided.
  • clamping bolt has a polygonal section, e.g. in the form of a triangle, which engages positively in the flange at the outer end of the hollow spindle.
  • FIGS. 1 and 2 As the first embodiment of a machine tool according to the invention, an angle grinder is shown in FIGS. 1 and 2, which is designated overall by the number 10.
  • a hollow spindle 14 is rotatably connected to the driven gear 15 of an angular gear which is driven by an electric motor.
  • a tool 12 which is designed as a grinding wheel, is clamped between two flanges 16, 18. While the inner, machine-side flange 18 is molded onto the end of the hollow spindle 14, the outer flange 16 is formed at the end of a clamping bolt 22 which is inserted through a central opening 17 of the tool 12.
  • the hollow spindle is supported by means of two ball bearings 56, 58, which are arranged on both sides of the driven wheel 15 of the angular gear.
  • the clamping bolt 22 has at its end facing away from the tool a thread 32 which projects outwards from the hollow spindle 14 and onto which a securing element 20 in the form of a clamping nut can be screwed.
  • a fixed stop 28 in the form of an annular flange is arranged on the hollow spindle 14 and bears against the inner ring of the ball bearing 56, which faces away from the tool 12.
  • a sleeve-shaped displaceable stop 30 is also arranged on the hollow spindle 14.
  • Spring elements 26 are located between the displaceable stop 30 and the fixed stop 28 held, which are designed as disc springs and which are enclosed on the outside by the movable stop 30. The spring force is about 1000 - 5000 N.
  • the displaceable stop 30 can be displaced in the axial direction with the aid of a clamping device 24 via a clamping fork 34 which can be actuated via a clamping lever 38.
  • the sleeve-shaped stop 30 has an outer annular shoulder 31 against which two free fork ends 36 of the clamping fork 34 can be pressed.
  • the clamping fork 34 has an approximately U-shaped basic shape and is rotatably mounted on the housing 42 via two lateral pins 41.
  • the two fork ends 36 are connected via a cross piece 35, from the center of which a common fork end 37 projects, by means of which the clamping fork 34 can be pivoted about the two lateral pins 41.
  • the pins 41 are arranged offset from the fork ends 36 in the direction of the common fork end 37, the fork ends 36 protrude outward from the axis of rotation fixed by the pins 41. If the pivot fork is removed from the tool at its common end 37, this therefore leads to a pivoting of the fork ends 36 in the direction of the annular shoulder 31 of the displaceable stop 30.
  • the tensioning lever 38 is pivotably mounted with a long lever end 46 in a recess in the housing 42 by means of a pin 48. From the pin 48, the clamping lever 38 is extended via a short lever end 44, on which a roller 50 is provided, which abuts the common end 37 of the clamping fork 34.
  • the tensioning lever 38 projects laterally from the housing 42 with a cranked section 43 of its long lever end 46 and, after a short straight section, merges into an approximately trapezoidal section 45, which covers the clamping bolt 22 with the screwed-on securing element 20 from the outside in the clamping position shown.
  • the trapezoidal section 45 finally merges again into a straight section, on which the clamping lever 38 is locked on the housing 42 by means of a catch 52.
  • the clamping lever end 54 is bent laterally outwards from the housing 42 in order to make it easy to grip.
  • the displaceable stop 30 protrudes somewhat outwards from the housing surface, so that the securing element 20 screwed onto the thread 32 rests directly on the annular surface of the displaceable stop 30 and is thus acted upon by the force of the spring elements 26.
  • the two mutually facing surfaces of the securing element 20 and the displaceable stop 30 have end teeth 21, by means of which the securing element 20 is positively secured to the displaceable stop 30.
  • the clamping bolt 22 has a polygonal section in the form of a triangle with three circular segments 25 on its outer grinding wheel-side area, which are each connected via straight sections 27.
  • the polygonal section 19 engages in a form-fitting manner in a correspondingly shaped recess on the flange 18 of the hollow spindle 14.
  • the polygonal section 19 is followed by a cylindrical section 23 of the clamping bolt 22, which engages in the opening 17 of the tool 12 and to which the flange 16 is connected.
  • the tensioning lever 38 is gripped at its end 54 and pivoted away from the housing 42 to overcome the force of the locking means 52.
  • This moves the short Lever end 44 with its roller 50 in a direction opposite the tool 12, whereby the two fork ends 36 are pressed onto the annular shoulder 31 and the displaceable stop 30 is thus displaced in the direction of the tool 12.
  • the positive connection between the securing element 20 and the displaceable stop 30 is released and the securing element is relieved of the force of the spring elements 26, so that the nut can be unscrewed from the thread 32 of the clamping bolt 22 without the aid of a tool.
  • clamping bolt 22 can be pulled out of the hollow spindle 14 so that the tool 12 can be removed.
  • a new tool 12 is secured after inserting the clamping bolt 22 through its central opening 17 and then secured in a rotationally fixed manner in the reverse manner after the clamping nut has been screwed on.
  • a seal 57 is arranged between the fixed stop 28 and the housing seat of the ball bearing 56.
  • a rolling element 39 in the form of a roller is embedded in each fork end 36, as a result of which the friction is considerably reduced and thus seizing due to incorrect operation is prevented.
  • FIGS. 4 and 5 A slightly modified embodiment is shown in FIGS. 4 and 5.
  • a hollow spindle 64 is supported by means of two ball bearings 106, 108 and driven via the driven gear 65 of an angular gear.
  • a grinding tool 62 is held in a corresponding manner between a flange 68 at the outer end of the hollow spindle 64 and a flange 66 of a clamping bolt 72 inserted into the hollow spindle 64.
  • the clamping bolt 72 is secured in a corresponding manner with the aid of a polygonal section 69 on the flange 68 of the hollow spindle 64.
  • the polygonal section 69 of the clamping bolt 64 is followed by a cylindrical section 73, which is closed off by the flange 66.
  • the clamping bolt 72 protrudes outward from the housing 92 with its end facing away from the tool 62 and is fixed at its end via a bayonet catch 82 with a securing element 70.
  • a fixed stop 78 is arranged on the hollow spindle 64, to which a displaceable stop 80 is assigned. Between the fixed stop 78 and the displaceable stop 80, spring elements 76 are provided, by means of which the sleeve-shaped, displaceable stop 80 is urged outwards against the securing element 70.
  • the securing element 70 is thus acted upon in a direction opposite to the tool 62, as a result of which the tool 62 is clamped in a rotationally fixed manner between the two flanges 66 and 68.
  • a clamping device 74 is also provided, through which the displaceable stop 80 by shifting a clamping lever 88 in the direction of the tool 62 is displaceable, whereby the securing element 70 is relieved of the force of the spring elements 76 so that it can be released from the end of the clamping bolt 72 and the clamping bolt 72 from the opening 67 of the tool 62nd can be pulled out.
  • a bayonet lock 82 is provided instead of a clamping nut in the embodiment according to FIG. 3.
  • the securing element 70 is designed as a simple knurled knob on which a radial locking pin 79 is arranged.
  • an axial groove 83 is provided, from which a plurality of oblique pitch grooves 85 extend.
  • the securing element 70 can be inserted in the release position from the end of the clamping bolt 72 through the axial groove 83 with its locking pin 79 and can be latched laterally into one of the pitch grooves 85. If a tool of a different thickness is to be fastened, the locking pin 79 can be locked in another pitch groove 85.
  • the locking pin 79 is held at the end of a slope groove 85, so that the securing element is secured in this position.
  • the clamping device 74 has a clamping fork 84 with a U-shaped basic shape, the two fork ends 86 of which are connected via a central web 96, from which a common fork end 87 protrudes.
  • the clamping fork 84 can be pivoted about an axis of rotation 90 fixed to the device by actuating the common fork end 87.
  • the tensioning fork 84 is supported on its two fork ends 86 on the housing 92 by means of laterally projecting pins 91.
  • the axis of rotation of the Tensioning fork 84 thus runs through the two fork ends 86.
  • rolling elements 89 are arranged in the form of rollers to reduce friction.
  • the contact surface between the annular shoulder 81 of the displaceable stop 80 and the clamping fork 84 is thus formed by the rolling elements 89 in the central region 93 of the clamping fork.
  • the tensioning lever 88 is pivotally mounted outside the housing 92 by means of a pin 98. At this end, the tensioning lever 88 is designed as an eccentric 95, which bears against a pressure piece 97 which is axially displaceable in the housing 92. The end of the pressure piece 97 lies against the common end 87 of the clamping fork 84. The tensioning fork 84 is urged against the pressure piece 97 by a spring 99, so that the tensioning fork 84 is lifted off the displaceable stop 80 in the tensioned position shown.
  • the tensioning lever 88 extends from the eccentric 95 with an approximately trapezoidal section 94 over the end of the tensioning bolt 72, and the securing element 70 and lies with its end with a flat section on the housing 92, from which a bent section 104 extends outwards protrudes.
  • the locking pin 79 of the securing element 70 is relieved of load, so that the locking pin 79 is moved through the gradient groove 85 to the axial groove 83 of the bayonet catch 82 can and can be pulled out through the axial groove 83 from the clamping bolt 72.
  • the tool 62 can now be changed in a known manner by pulling out the clamping bolt 72.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
EP92107613A 1991-07-05 1992-05-06 Tragbare Werkzeugmaschine Expired - Lifetime EP0521259B1 (de)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
DE19914122320 DE4122320A1 (de) 1991-07-05 1991-07-05 Werkzeugbefestigung bei elektrowerkzeuge
DE4122320 1991-07-05
DE19914134072 DE4134072A1 (de) 1991-10-15 1991-10-15 Tragbare werkzeugmaschine
DE4134072 1991-10-15
DE4134887 1991-10-23
DE4134887 1991-10-23

Publications (2)

Publication Number Publication Date
EP0521259A1 EP0521259A1 (de) 1993-01-07
EP0521259B1 true EP0521259B1 (de) 1994-07-27

Family

ID=27202689

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92107613A Expired - Lifetime EP0521259B1 (de) 1991-07-05 1992-05-06 Tragbare Werkzeugmaschine

Country Status (5)

Country Link
US (1) US5263283A (es)
EP (1) EP0521259B1 (es)
JP (1) JP2980269B2 (es)
DE (1) DE59200319D1 (es)
ES (1) ES2066512T3 (es)

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US7537065B2 (en) 2002-01-10 2009-05-26 Black & Decker Inc. Angle grinder
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

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USD832666S1 (en) 2012-07-16 2018-11-06 Black & Decker Inc. Oscillating saw blade
US9486934B2 (en) * 2012-11-23 2016-11-08 Chervon (Hk) Limited Accessory clamping mechanism and power tool having the same
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system
CN106312954B (zh) * 2015-06-26 2021-08-10 苏州宝时得电动工具有限公司 手持式工具及其夹紧装置
US10040215B2 (en) * 2015-11-09 2018-08-07 Robert Bosch Tool Corporation Blade and blade attachment system for an oscillating tool
US10011036B2 (en) * 2015-11-09 2018-07-03 Robert Bosch Tool Corporation Blade and blade attachment system for an oscillating tool
US10682736B2 (en) 2016-09-29 2020-06-16 Black & Decker Inc. Accessory clamp and spindle lock mechanism for power tool
USD814900S1 (en) 2017-01-16 2018-04-10 Black & Decker Inc. Blade for oscillating power tools
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JP7096032B2 (ja) 2018-03-28 2022-07-05 株式会社マキタ マルチツール
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US11590593B2 (en) 2019-11-28 2023-02-28 Makita Corporation Power tool
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JP7422538B2 (ja) 2019-12-26 2024-01-26 株式会社マキタ 作業工具
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US7537065B2 (en) 2002-01-10 2009-05-26 Black & Decker Inc. Angle grinder
US7722444B2 (en) 2005-05-13 2010-05-25 Black & Decker Inc. Angle grinder
US8087976B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Trigger assembly for angle grinder
US8087977B2 (en) 2005-05-13 2012-01-03 Black & Decker Inc. Angle grinder
US10818450B2 (en) 2017-06-14 2020-10-27 Black & Decker Inc. Paddle switch

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EP0521259A1 (de) 1993-01-07
DE59200319D1 (de) 1994-09-01
US5263283A (en) 1993-11-23
JPH05185363A (ja) 1993-07-27
JP2980269B2 (ja) 1999-11-22
ES2066512T3 (es) 1995-03-01

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