EP0322626B1 - Power grinder with an adjustable protecting hood - Google Patents

Power grinder with an adjustable protecting hood Download PDF

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Publication number
EP0322626B1
EP0322626B1 EP19880120765 EP88120765A EP0322626B1 EP 0322626 B1 EP0322626 B1 EP 0322626B1 EP 19880120765 EP19880120765 EP 19880120765 EP 88120765 A EP88120765 A EP 88120765A EP 0322626 B1 EP0322626 B1 EP 0322626B1
Authority
EP
European Patent Office
Prior art keywords
locking
holding
protective hood
ring
grinder
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
EP19880120765
Other languages
German (de)
French (fr)
Other versions
EP0322626A2 (en
EP0322626B2 (en
EP0322626A3 (en
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
Family has litigation
Priority to DE3744219 priority Critical
Priority to DE19873744219 priority patent/DE3744219C2/de
Application filed by C&E Fein GmbH and Co filed Critical C&E Fein GmbH and Co
Publication of EP0322626A2 publication Critical patent/EP0322626A2/en
Publication of EP0322626A3 publication Critical patent/EP0322626A3/en
Application granted granted Critical
Publication of EP0322626B1 publication Critical patent/EP0322626B1/en
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6343692&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0322626(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EP0322626B2 publication Critical patent/EP0322626B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00Safety 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
    • B24B55/04Protective covers for the grinding wheel
    • B24B55/05Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools

Description

  • The invention relates to a hand grinder with a grinder housing, in which a grinding spindle is rotatably mounted, with a protective hood for a tool, which is rotatably mounted on a clamping neck by means of a holding part and can be fixed thereon.
  • From DE-A-31 35 820 a hand grinder is known in which the protective hood is rotatably mounted on the clamping neck and is held with axial play, whereby to compensate for this play a resilient element biased in the axial direction is used, which against a fastening ring of the protective hood a shoulder surface on the neck presses. As a result, the protective hood is secured against rotation by friction.
  • The disadvantage of this device is the fact that the protective hood can be adjusted unintentionally, especially when you think that such grinding machines are often used in confusing places, the user must be sure that the protective hood is in the correct position and also remains in this.
  • From EP-A-143 251 a hand grinder of the type mentioned is known, in which the protective cover is releasably attached to the spindle neck of the gear housing by means of a clamp and a fastening screw. In order to prevent the protective hood from unintentionally moving from the gear housing in the axial direction to the grinding wheel, a securing element is provided in the region of the end face of the spindle neck, which protrudes beyond the outside diameter of the spindle neck and the inside diameter of the clamping clamp. This securing element can be designed as a flat disk and fastened with a screw on the end face of the spindle neck. Furthermore, the securing element can be designed as a spring-loaded lever and can be pivotably mounted on the spindle neck.
  • From US-A-3 811 233 a stationary machine tool is also known, in which a protective hood for a rotating tool is provided, which can be fixed to a rear plate of the machine housing via a ring rigidly connected thereto. Various circumferential recesses of the ring are used for the connection, through which bolts can be inserted into the rear plate. In order to secure the ring against twisting, a spring-loaded pin is provided, which can be snapped into one of the recesses on the circumference of the ring.
  • The invention has for its object to improve a grinding machine of the generic type such that an unintentional adjustment of the protective hood, for example by lateral pressure, is no longer possible.
  • This object is achieved according to the invention in a grinding machine of the type described in the introduction in that the fixing part is held in a rotationally fixed manner in the area of the clamping neck, that the fixing part or the holding part has at least one and the other part has several locking elements which can be locked together and are loaded by a spring member, which are detachable from each other against the spring force, that the fixing part and the holding part can be tilted relative to one another, and that the fixing part has a lever for tilting, which extends between the protective hood and the grinding machine housing.
  • According to the proposals of the invention, the locking elements, which can be locked together, provide a positive and non-rotatable connection between the holding part and the grinding machine housing, so that the protective hood can no longer twist and that this connection can only be released against the spring force. The fact that the locking part and the holding part can be tilted relative to one another results in a structurally particularly simple solution. Since a lever is provided for actuating the locking part, which extends between the protective hood and the grinding machine housing, simple and ergonomically advantageous actuation is ensured.
  • A particularly advantageous embodiment provides that the locking elements are locking recesses provided on one part and locking bodies provided on the other part, in which case the locking bodies can engage in the locking recesses. In the simplest case, the latching depressions are bores, while in the simplest case the latching body is a pin that engages in these bores. A very easy to implement implementation of the invention provides that a locking body and several locking recesses are provided, the single locking body is then arranged on the holding or locking part and the locking recesses on the other part.
  • It has proven to be particularly expedient if the holding part is designed as a ring surrounding the clamping neck, which is preferably integrally formed on the protective hood.
  • Likewise, the locking part can be a ring enclosing the clamping neck.
  • With regard to a tiltable mounting of the locking part in relation to the clamping neck, it would be conceivable to mount the locking part on it with play and to place it against a shoulder, for example by means of a spring. But it is also conceivable that the locking part is made of resilient material and thus with one end firmly on the instep is arranged neck or on the grinder housing and creates by its own spring action the possibility that the locking part is so deformable that the locking body can be disengaged from the locking recesses.
  • If the tiltable mounting of either the holding part or the locking part takes place in particular on the clamping neck, it is provided in an advantageous further development that the spring member is an annular element enclosing the clamping neck, with which the respective tiltable part is placed against a shoulder.
  • Further features and advantages are the subject of the following description and the drawing of some exemplary embodiments. Show it:
    • Figure 1 is a side view of a front part of a first embodiment of a hand grinder according to the invention with a protective hood shown in section.
    • Fig. 2 is a partial view similar to Fig. 1 of a second embodiment and
    • Fig. 3 shows a partial cross section through a clamping neck of a third embodiment in plan view of the protective hood.
  • An angle grinder shown in FIG. 1, designated as a whole by 1, shows a motor housing 2 and a gear housing 3. A grinding spindle 4 protrudes from the gear housing 3 and carries a clamping flange 5 at its end. A grinding wheel 6 is placed on this clamping flange 5 and clamped against the clamping flange 5 by a counter flange 7 of a screw that can be screwed into the grinding spindle 4.
  • The grinding wheel 6 is partially covered by a protective hood designated as a whole, which is rotatably mounted on a clamping neck 9 surrounding the grinding spindle 4 between the counter flange 5 and the gear housing 3 and mounted on the gear housing 3.
  • Starting from the gear housing 3, the clamping neck 9 is subdivided into a total of three sections 10 to 12, which are coaxial with the grinding spindle 4 and with a successively smaller outside diameter starting from the gear housing. Between these circular-cylindrical sections 10 to 12, annular contact surfaces 13 and 14 are thereby formed in planes perpendicular to the axis of rotation of the grinding spindle 4.
  • The first circular cylindrical section lying adjacent to the gear housing 3 is surrounded by a spring element 15, which is supported on the one hand on a surface 16 formed by the transmission housing 3 and perpendicular to the axis of rotation of the grinding spindle 4 and on the other hand on a ring also surrounding the first circular cylindrical section 10 17 of a locking element designated as a whole by 18. which also has a lever arm 19 molded onto the ring 17, which extends in a space between the protective hood 8 and the motor housing 2. The ring 17 is pressed by the spring element 15 against an intermediate ring 20 seated on the second circular-cylindrical section 11, which in turn bears against the contact surface 13 between the circular-cylindrical section 10 and the smaller-diameter circular-cylindrical section 11. The intermediate ring 20 is in turn held by a fixing ring 21, which sits on the third circular cylindrical section 12 and bears against the contact surface 14. This fixing ring 21 is held by a snap ring 22, which engages in a circumferential groove 23, machined into the third circular-cylindrical section 12.
  • To mount the protective hood 8, the intermediate ring 20 is provided on its side facing the fixing ring 21 with a radially outward opening and an annular recess 24 open to the fixing ring 21, in which an annular holding part 25 of the protective hood 8 can be rotated coaxially to the grinding spindle 4, but in is axially fixed. This holding part 25 has holes 26 arranged at the same angular distance on a circular arc segment. One of these bores 26 engages with a pin 27 arranged on the fixing part 18 in the region of the transition between the ring 17 and the lever arm 19, which extends from the fixing part 18 through a recess 28 in the intermediate ring 20 to the holding part 25.
  • The ring 17 is held on the first circular-cylindrical section 10 with play so that it can be displaced in the direction of the gear housing 3 in the axial direction of the grinding spindle 4 against the action of the spring element 15, which is, for example, a wave spring or a rubber ring . By actuating the locking part 18 in the region of the lever arm 19, the ring 17 as a whole is tilted so far relative to the clamping neck 9 that the transition between the ring 17 and the lever 19 of the locking part 18 approaches the surface 16 of the gear housing 3 and thus the in this area arranged pin 27 is moved out of the bore 26 in the holding part 15, in which he has engaged. In this case, the protective hood 8, which is rotatably mounted with the holding part 25 in the intermediate ring 20, can be freely rotated around the clamping neck 9. After releasing the lever arm 19, the pin 27 is moved again in the direction of the holding part 25 by the spring element 15, so that he now comes into engagement with the opposite bore 26 and the holding part 25 with the protective cover 8 rotatably fixed on the collar 9. This is done in that the pin 27 is non-rotatably fixed on the clamping neck 9 through the recess 28.
  • Advantageously, the walls of the bores 26 are shaped so that the pin 27 cannot jump out of the bores 26 even when there is strong lateral pressure on the protective hood 8. Furthermore, in order to be able to lock the protective hood 8 in all conceivable rotational positions, it is provided that the bores 26 are provided on the holding part 25 in a large circumferential area, all of which are centered on a circular path segment concentric with the clamping neck 9.
  • A second exemplary embodiment, shown in FIG. 2, shows a protective hood 8 which is likewise rotatable about the clamping neck 9 by the intermediate ring 20 and the fixing ring 21 with their holding part 25.
  • Insofar as the same parts are provided as in the first exemplary embodiment, the same reference symbols are also used, with regard to the explanation of which reference is made to the above statements.
  • In contrast to the first exemplary embodiment, the holding part 25 is not provided with bores 26 arranged coaxially to the grinding spindle 4, but with recesses 30 which extend in the radial direction from an outside of the holding part 25 in the direction of the clamping neck 9, which are preferably in the peripheral region of the holding part 25 are provided, which does not merge into the protective hood 8.
  • A pin 31 aligned in the radial direction of the clamping neck 9 engages in these recesses 30 and is held on a lever 32 made of resilient material which extends parallel to an axial direction of the clamping neck 9 on an outer side thereof so that the pin 31 protrudes from this lever 32 in the direction of the holding part 25. The lever 32 is preferably made of resilient material and held on the gear housing 3, for example by means of a screw 33. By bending the lever 32 with respect to the clamping neck 9 in the radial direction to the outside, the pin 31 can be disengaged from the recess 30, as a result of which the protective hood 8 can be rotated on the clamping neck. To actuate the lever 32, the latter is preferably provided with a tongue 34 which extends beyond the pin 31 and forms a front end of the same and which permits simple actuation of the lever 32.
  • In contrast to the first exemplary embodiment, the lever 32 thus forms the locking part and replaces the lever 18 of the first exemplary embodiment.
  • In a third exemplary embodiment, shown in FIG. 3, the holding part is of identical design to that in the second exemplary embodiment and likewise has recesses 30 which extend in the radial direction towards the clamping neck 9 and are open to the outside.
  • In contrast to the second exemplary embodiment, however, a rocker arm 40 is provided, which is mounted rotatably about an axis 41, parallel to the axis of rotation of the grinding spindle 4, on the transmission housing 3. A first lever arm 42 arranged on one side of the axis of rotation 41 bears against a spring 43 which is supported on its opposite side on the transmission housing 3 and thereby acts on the first lever arm 42 away from the transmission housing. As a result, a second lever arm 44, which is opposite the first lever arm 42 with respect to the axis of rotation 41, is acted upon in the direction of the clamping flange 9, so that a pin 45 arranged at the front end of the locking part 25 of the holding part 25 is held in engagement with one of the recesses 30 becomes. In order to arrange the pin 45 in engagement with the recesses 30, the lever arm 44 must be bent in the axial direction of the clamping neck 9.
  • The lever 40 is preferably provided at a rear end of the first lever arm 42 opposite the axis of rotation 41 with a pressure surface 47, which allows the same to be acted upon and thus the pin to be disengaged from the recesses 30. Thus, after the pressure surface 47 has been acted upon, the protective hood 8 can be rotated and, after the pressure surface 47 has been released, the pin 45 can snap back into one of the recesses 30 in order to lock the protective hood 8 in a rotationally fixed manner.

Claims (7)

1. Hand grinder with a grinder housing (2, 3), in which a grinding spindle (4) is mounted rotatably, and with a protective hood (8) for a tool (6), said protective hood being mounted rotatably on a clamping collar (9) by means of a holding part (25) and being lockable on the latter, characterised in that a locking part (18) is held fixedly in terms of rotation in the region of the clamping collar (9), in that the locking part (18) or the holding part (25), at least one and the other respective part, have a plurality of locking elements (26, 27) which are engageable with one another and are loaded by a spring member (15) and which are releasable from one another counter to the spring force, in that the locking part (18) and the holding part (25) are tiltable relative to one another, and in that the locking part (18) has a lever (19) for the tilting which extends between the protective hood (8) and the grinder housing (2, 3).
2. Hand grinder according to Claim 1, characterised in that the locking elements are catch depressions (26, 30) provided on one part and catch bodies (27, 31, 45) provided on the other part.
3. Hand grinder according to Claim 2, characterised in that one catch body (27, 31, 45) and a plurality of catch depressions (26, 30) are provided.
4. Hand grinder according to one of the preceding claims, characterised in that the holding part (25) is designed as a ring surrounding the clamping collar (9).
5. Hand grinder according to Claim 4, characterised in that the holding part (25) is formed in one piece onto the protective hood (8).
6. Hand grinder according to one of the preceding claims, characterised in that the locking part (18) has a ring surrounding the clamping collar (9).
7. Hand grinder according to one of the preceding claims, characterised in that the spring member is an annular element (15) surrounding the clamping collar (9).
EP19880120765 1987-12-24 1988-12-13 Power grinder with an adjustable protecting hood Expired - Lifetime EP0322626B2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE3744219 1987-12-24
DE19873744219 DE3744219C2 (en) 1987-12-24 1987-12-24

Publications (4)

Publication Number Publication Date
EP0322626A2 EP0322626A2 (en) 1989-07-05
EP0322626A3 EP0322626A3 (en) 1990-10-10
EP0322626B1 true EP0322626B1 (en) 1993-03-31
EP0322626B2 EP0322626B2 (en) 1996-10-30

Family

ID=6343692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880120765 Expired - Lifetime EP0322626B2 (en) 1987-12-24 1988-12-13 Power grinder with an adjustable protecting hood

Country Status (5)

Country Link
US (1) US4924635A (en)
EP (1) EP0322626B2 (en)
JP (1) JPH0579466B2 (en)
DE (1) DE3744219C2 (en)
ES (1) ES2040316T5 (en)

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US5637035A (en) * 1995-06-28 1997-06-10 Milwaukee Electric Tool Corporation Adjustable guard arrangement for power tool
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US5765289A (en) * 1996-12-20 1998-06-16 Fiskars Inc. Rotary cutter
DE19914855B4 (en) * 1999-04-01 2004-04-22 Metabowerke Gmbh Hand grinder with a protective hood that can be adjusted in the circumferential direction
US6464573B1 (en) 2000-06-30 2002-10-15 Porter-Cable Corporation Guard attachment system with knurled clamp ring
DE20304448U1 (en) * 2003-03-19 2003-06-12 Berhalter Eberhard Hand tool
SE525836C2 (en) * 2003-03-31 2005-05-10 Atlas Copco Tools Ab Sander with guard and spindle lock
DE10336873B4 (en) * 2003-08-11 2007-09-20 Hilti Ag Guard assembly
DE10348395A1 (en) * 2003-10-17 2005-05-19 Robert Bosch Gmbh Protective cover for a power tool, power tool and system with protective hood and power tool
US7059947B2 (en) * 2004-05-12 2006-06-13 The Stanley Works Portable rail cutting apparatus
US20070117499A1 (en) * 2005-11-23 2007-05-24 Sunmatch Industrial Co., Ltd. Rotary protecting hood of a pneumatic grinder
DE102006027576A1 (en) * 2006-06-14 2007-12-20 Robert Bosch Gmbh Guard attachment device
EP1908549B1 (en) * 2006-10-07 2010-02-17 Metabowerke GmbH Power tool, especially an angle grinder, with a protective cover
DE102006053305A1 (en) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Hand tool with protective hood, in particular angle grinder
DE102006053303A1 (en) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Hand tool for a rotating tool with protective cover
DE102006053301A1 (en) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Hand tool for a rotating tool with protective cover
DE102007041840A1 (en) * 2006-11-13 2008-05-15 Robert Bosch Gmbh Hand tool with protective hood, in particular angle grinder
DE102007000845A1 (en) * 2007-10-11 2009-04-16 Hilti Aktiengesellschaft Manually operated machine for operating separating or grinding tool, has housing, drive screw for separating or grinding tool, and clamping lever mechanism that is provided with retaining spring element
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JP5684056B2 (en) * 2010-08-16 2015-03-11 株式会社マキタ Hand tool
JP5579575B2 (en) * 2010-11-02 2014-08-27 株式会社マキタ Disc grinder
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DE102012210759A1 (en) * 2012-06-25 2014-01-02 Robert Bosch Gmbh Guard device
DE202012102406U1 (en) 2012-06-29 2012-07-25 Sunmatch Industrial Co., Ltd. Cover structure of the pneumatic hand grinder
US8939816B2 (en) 2012-07-02 2015-01-27 Sunmatch Industrial Co., Ltd. Handheld pneumatic grinder with adjustable wheel guard structure
DE102012112621A1 (en) 2012-12-19 2014-06-26 C. & E. Fein Gmbh Hand tool e.g. angle grinder, has fuse elements cooperated together at actuator and clamping portion in each working position by positively locking protective cover at spindle neck movable in axial retaining element on spindle neck
US9555554B2 (en) 2013-05-06 2017-01-31 Milwaukee Electric Tool Corporation Oscillating multi-tool system
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US9475172B2 (en) * 2014-07-15 2016-10-25 Milwaukee Electric Tool Corporation Adjustable guard for power tool
USD744800S1 (en) 2014-07-16 2015-12-08 Milwaukee Electric Tool Corporation Power tool blade guard
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Also Published As

Publication number Publication date
JPH0579466B2 (en) 1993-11-02
DE3744219A1 (en) 1989-07-06
EP0322626A3 (en) 1990-10-10
US4924635A (en) 1990-05-15
JPH01281874A (en) 1989-11-13
DE3744219C2 (en) 1990-01-04
EP0322626A2 (en) 1989-07-05
ES2040316T3 (en) 1993-10-16
EP0322626B2 (en) 1996-10-30
ES2040316T5 (en) 1997-02-16

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