US20100120341A1 - Portable grinder - Google Patents

Portable grinder Download PDF

Info

Publication number
US20100120341A1
US20100120341A1 US12/451,028 US45102808A US2010120341A1 US 20100120341 A1 US20100120341 A1 US 20100120341A1 US 45102808 A US45102808 A US 45102808A US 2010120341 A1 US2010120341 A1 US 2010120341A1
Authority
US
United States
Prior art keywords
grinding head
portable grinder
grinder according
stop
grinding
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.)
Abandoned
Application number
US12/451,028
Other languages
English (en)
Inventor
Stephan Rieth
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20100120341A1 publication Critical patent/US20100120341A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • B24B23/005—Auxiliary devices used in connection with portable grinding machines, e.g. holders
    • 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
    • B24B23/028—Angle tools
    • 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
    • B24B27/033—Other grinding machines or devices for grinding a surface for cleaning purposes, e.g. for descaling or for grinding off flaws in the surface

Definitions

  • the present invention pertains to a portable grinder with a grinding head, the grinding contact zone of which can be placed against a workpiece.
  • Portable grinders of this type which can be placed against a workpiece so that the machine resists tipping in at least one direction are known from WO 2005/095052 A1. What is described here is, among other things, a grinder with a conical grinding head for grinding down edges.
  • the machine has a ring-shaped plate concentrically surrounding the grinding head by which the grinder can be set against a workpiece surface adjacent to the edge.
  • This portable grinder makes it possible to remove large amounts of the material quickly.
  • the degrees of freedom for the movement of the grinding head are limited.
  • Angle grinders with grinding heads which can be moved into any desired position are also known.
  • the invention is based on the goal of creating a novel portable grinder which combines greater flexibility with respect to the movement of the grinding head with high removal capacity and grinding quality.
  • the inventive portable grinder which achieves these goals is characterized by a stop, which is located a certain distance away from the grinding contact zone.
  • the stop forms a pivot axis for the grinding head and the fulcrum of a lever around which at least one handle can be rotated
  • the angular position of the grinding head relative to the direction toward the pivot axis is largely determined by the stop, which is located a certain distance away from the grinding contact zone. Changes to this angular position are possible only in association with the approach of the grinding head to the surface of the workpiece in the direction more-or-less perpendicular to that surface.
  • the user of the grinder can therefore, without the tilting of the grinding head in the direction just mentioned, i.e., with a high degree of grinding accuracy, exert a large amount of grinding contact force and a large amount of force in the forward-feed direction parallel to the workpiece surface.
  • two handles arranged a certain distance apart, are provided, so that the machine can be held and guided with both hands, wherein, in a projection onto the workpiece, the grinding head and/or the stop is located between the handles.
  • the stop is preferably designed so that the machine can be pressed against the workpiece without the danger of tilting in the direction of the pivot axis.
  • the user can focus to an even greater degree on the exertion of suitable grinding contact and forward-feed forces.
  • the stop is preferably rounded in a cross-sectional plane perpendicular to the pivot axis. It can be formed, for example, by a pin with a circular cross section.
  • the stop comprises a roller, which can be set on the workpiece, wherein several rollers arranged a certain distance apart can be provided.
  • the distance between the rollers is preferably adjustable.
  • the rollers can be locked in place on a shaft or can rotate on an axle.
  • the rollers can be locked in place on the shaft at the desired distance from each other.
  • two rollers are provided, and the sides of these roller which face each other comprise slanted rolling surfaces, by which the guide stop makes contact with two different workpiece surfaces, which come together at an angle.
  • a guide stop of this type with rolling surfaces beveled at a 45° angle can, for example, be set against two surfaces of a workpiece which come together at a right angle in order to grind a 45° bevel on the edge formed by the meeting surfaces.
  • the rolling surfaces can be beveled to different angles. For example, one can have a 30° angle, the other a 60° angle, so that a 30° bevel is produced.
  • a belt grinder head for example, can be used as the grinding head
  • a rotating grinding head is used in the preferred embodiment of the invention, wherein the pivot axis formed by the guide stop extends in a tangential direction relative to the rotational axis of the grinding head.
  • the pivot axis formed by the guide stop is also preferably parallel to the surface ground by the grinding head.
  • the guide stop can preferably be pivoted toward the rotational axis of the grinding head and locked in place in a desired position.
  • the position can be adjusted in correspondence with the inclination of the slanted ring-shaped grinding surfaces attached to the end surface of the grinding disk.
  • the machine has an elongated housing, which encloses a drive motor for the grinding head, wherein a drive shaft for the grinding head projects, preferably at an angle, from the housing.
  • a handle can be provided a certain distance away from the pivot axis, especially at each of the two longitudinal ends of the housing, as a result of which the length of the lever extending to the pivot axis becomes quite long. This makes it possible in turn to exert a large amount of pressure on the workpiece and thus also to exert high grinding forces. It is advisable here for the lengthwise dimension of the handle near the grinding head to be parallel to the pivot axis.
  • the guide device is a component of a unit which comprises the grinding head and which can be connected to the housing.
  • the housing of a standard commercial angle grinder can be used, and the angle grinder can be converted into the inventive device.
  • the grinding head comprises a multi-layer grinding disk, especially with a wire backing plate, so that high contact forces can be absorbed. It is advisable to provide a hexagonal socket, for example, to prevent normal grinding heads from being used in such grinders.
  • FIG. 1 shows a perspective view of a first exemplary embodiment of an inventive portable grinder
  • FIG. 2 shows the portable grinder of FIG. 1 in a perspective view rotated 90° from that of FIG. 1 ,
  • FIG. 3 shows a detail of the portable grinder of FIG. 1 .
  • FIG. 4 shows an exploded perspective view of the portable grinder of FIG. 1 , which comprises a unit which can be connected to a standard commercial angle grinder,
  • FIG. 5 shows a cross-sectional side view of the unit of FIG. 4 in isolation
  • FIG. 6 shows a partial perspective view of the unit of FIG. 4 .
  • FIGS. 7-9 show various perspective views of another exemplary embodiment of an inventive portable grinder.
  • a portable grinder comprises an elongated housing 1 with a handle 2 at one end and another handle 3 , designed as a U-shaped bracket, at the opposite end.
  • a drive shaft 4 projects from the side of the housing 1 .
  • This shaft is in drive connection with a motor/gear assembly (not shown) installed in the housing 1 .
  • the drive shaft 4 drives a grinding head 5 with a grinding disk 6 .
  • the grinding disk 6 comprises, on the side facing the workpiece 7 , a ring-shaped surface 8 ( FIG. 3 ), which is at a certain angle to the grinding plane and which is in grinding contact with the workpiece 7 .
  • the grinding head 5 is a component of an assembly 9 , shown separately in FIG. 4 , which comprises a cylindrical connecting piece 10 , which can be clamped to a shoulder 11 on the housing 1 . When this clamping connection is established, the drive shaft 4 is brought into drive connection with the grinding head 5 .
  • the cylindrical connecting piece 10 of the assembly 9 is attached to a U-shaped retaining part 12 with side pieces 13 and 14 , which thus form the sides of the U.
  • a U-shaped sheet metal part 15 is hinged to these side pieces by screwed connections. A certain distance away from each of these screwed connections, another screwed connection is provided, wherein the screw of each these connections passes through a slot 16 in the associated side piece of the U-shaped sheet-metal part 15 .
  • a spark shield 22 is screwed to one side of the U-shaped sheet-metal part 15 .
  • a shaft 18 which is rotatably supported in shaft bearings 21 on the side pieces and on which two rollers 19 , 20 are seated, which can be connected nonrotatably to the shaft by clamping screws.
  • the shaft it would also be possible to provide an axle pin, connected rigidly to the U-shaped sheet-metal part 15 , on which the rollers are free to rotate independently of each other.
  • a rotating part 26 of the grinding head 5 which can be connected to the grinding disk 6 , is supported rotatably by a ball bearing 27 in a bushing part 28 .
  • the bushing part 28 is connected to the connecting piece 10 .
  • the drive shaft 4 engages in a bore 29 in the rotating part 26 , wherein a clutch 30 establishes the drive connection with the rotating part 26 .
  • the grinding contact zone 26 of the grinder is pressed with the help of the two handles 2 and 3 against the workpiece 7 and with the help of the rollers 19 , 20 , wherein, in particular, by suitably distributing the load, the user can generate the desired grinding pressure perpendicular to the workpiece surface and also the desired forward-feed in the longitudinal direction of the weld 23 .
  • the rotational axis of the shaft 18 forms a fulcrum for the rotation of the handles and a pivot axis 27 for the grinding head 5 .
  • the distance of the axis from the handle 2 is approximately 300 mm, the distance to the handle 3 about 150 mm.
  • the rollers or wheels 19 and 20 roll over the workpieces surface. Because of the distance between the rollers, which is adjustable, the grinder is unable to tilt in the direction of the rotational axis of the shaft 18 , that is, perpendicular to the forward-feed direction.
  • the grinder sits on the surface of the workpiece 7 with 3 -point support.
  • the guidance by the shaft 18 with the rollers 19 and 20 makes it possible for the user of the grinder to focus fully on the exertion of the correct pressing and forward-feed forces.
  • the rollers 19 and 20 mounted nonrotatably on the shaft 18 , furthermore, make it much easier to guide the grinder straight along the weld 23 .
  • rollers 19 a and 20 a seated nonrotatably on a shaft 18 a , comprise ring-shaped surfaces 24 , 25 , oriented at an angle of 45° to the axis of the shaft, on their facing sides.
  • the portable grinder according to FIGS. 5-7 can therefore be set against the surfaces of a workpiece 7 a which come together at a right angle and thus be used as a bevel grinder.
  • the machine cannot tip in the direction perpendicular to the longitudinal direction of the bevel. The grinding of flat bevels is thus facilitated even more.
  • the assembly 9 or 9 a of the previously described bevel grinder can be locked in place in the desired position relative to the rotational axis of the grinding head 5 , wherein this position depends on the angle of inclination of the ring-shaped surface 8 on the grinding disk 7 .
  • the setting is accomplished in such a way that the surface line of the ring-shaped surface 8 is parallel to the workpiece surface in the forward-feed direction.
  • axle or shaft it can be advantageous for only an axle or shaft to rest directly on an edge.
  • the shaft can be profiled, so that it cannot slide off laterally.
  • rollers can be pushed all the way to the ends of the shaft and locked in place there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US12/451,028 2007-04-26 2008-04-25 Portable grinder Abandoned US20100120341A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007020199.2 2007-04-26
DE102007020199A DE102007020199A1 (de) 2007-04-26 2007-04-26 Handschleifmaschine
PCT/DE2008/000724 WO2008131748A2 (de) 2007-04-26 2008-04-25 Handschleifmaschine

Publications (1)

Publication Number Publication Date
US20100120341A1 true US20100120341A1 (en) 2010-05-13

Family

ID=39777551

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/451,028 Abandoned US20100120341A1 (en) 2007-04-26 2008-04-25 Portable grinder

Country Status (4)

Country Link
US (1) US20100120341A1 (de)
JP (1) JP2010524703A (de)
DE (1) DE102007020199A1 (de)
WO (1) WO2008131748A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105965361A (zh) * 2016-06-27 2016-09-28 镇江耐丝新型材料有限公司 除磷轮轴
US10144102B2 (en) * 2015-07-22 2018-12-04 Hugo Benoit Pipe beveling tool

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202011103202U1 (de) * 2011-06-29 2011-10-10 Janser Gmbh Handhabungsvorrichtung für ein eigenständiges und separat verwendbares Schleifgerät sowie Schleifvorrichtung
CN110328594A (zh) * 2019-06-22 2019-10-15 珠海市清新美怡居家居用品有限公司 一种铁质家具加工用除锈装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081360A (en) * 1935-05-09 1937-05-25 Mall Arthur William Rail slotter
US20020049032A1 (en) * 1999-10-29 2002-04-25 Hempel Chad C. Railroad rail support for a grinder
US20020132570A1 (en) * 2001-03-13 2002-09-19 The Boeing Company Ergonomic sander handle apparatus and method
US20050120573A1 (en) * 2003-12-05 2005-06-09 Port Kenneth L. Tool grinding jig

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19733463A1 (de) * 1996-08-07 1998-02-12 Leo Lustig Schleifmaschine
DE102004040901A1 (de) * 2004-03-31 2005-10-20 Stephan Rieth Schleifkopf für eine Schleifvorrichtung
DE102004040900A1 (de) 2004-03-31 2005-10-20 Stephan Rieth Handschleifvorrichtung
DE102006015275B4 (de) * 2006-04-01 2008-10-16 Metabowerke Gmbh Handwerkzeuggerät zur schleifenden oder schruppenden Nachbearbeitung metallischer Werkstücke

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2081360A (en) * 1935-05-09 1937-05-25 Mall Arthur William Rail slotter
US20020049032A1 (en) * 1999-10-29 2002-04-25 Hempel Chad C. Railroad rail support for a grinder
US20020049031A1 (en) * 1999-10-29 2002-04-25 Hempel Chad C. Railroad rail support for a grinder
US20020132570A1 (en) * 2001-03-13 2002-09-19 The Boeing Company Ergonomic sander handle apparatus and method
US20050120573A1 (en) * 2003-12-05 2005-06-09 Port Kenneth L. Tool grinding jig

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10144102B2 (en) * 2015-07-22 2018-12-04 Hugo Benoit Pipe beveling tool
CN105965361A (zh) * 2016-06-27 2016-09-28 镇江耐丝新型材料有限公司 除磷轮轴

Also Published As

Publication number Publication date
WO2008131748A3 (de) 2009-01-08
DE102007020199A1 (de) 2008-10-30
WO2008131748A2 (de) 2008-11-06
JP2010524703A (ja) 2010-07-22

Similar Documents

Publication Publication Date Title
US20080045126A1 (en) Manual Grinding Tool
US7137327B2 (en) Riving knife assembly for a dual bevel table saw
US20080274678A1 (en) Grinding machine and a grinding jig therefore
US20060201297A1 (en) Powered feed system for use with a machine saw table for providing guided motion along at least one axis
US20100120341A1 (en) Portable grinder
WO2004041490A2 (en) Dual bevel table saw
US9346144B2 (en) Hand-held power tool having a support device
KR102318239B1 (ko) 볼밸브용 볼 래핑장치
US11806826B2 (en) Automatic blade holder
US5810649A (en) Tool guide for sharpening woodcarving and tools
JP6438781B2 (ja) 溶接ビードの余盛部研削装置
JPH068123A (ja) 研削装置
JPH08267395A (ja) 平面切断機
JP6268064B2 (ja) レール削正装置
CA3154282A1 (en) Automatic blade holder
KR200478673Y1 (ko) 칼갈이 지그 장치
US8439727B1 (en) Drill bit sharpening tool
WO2021181631A1 (ja) ガイドレール研削装置、ガイドレールの研削方法、およびガイドレール研削装置の調整方法
GB2405608A (en) Honing apparatus
US5317808A (en) Hole cutting apparatus
US5947173A (en) Cutting apparatus for wood or the like
US4373299A (en) Tool finishing machine having improved support table
JPH1086022A (ja) クランプ装置と加工装置
JPH0890404A (ja) 手持ち式電動研削工具
JP4305877B2 (ja) ドリル刃研磨器

Legal Events

Date Code Title Description
STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION