WO2002097298A1 - Anti-vibration unit - Google Patents

Anti-vibration unit Download PDF

Info

Publication number
WO2002097298A1
WO2002097298A1 PCT/GB2002/002195 GB0202195W WO02097298A1 WO 2002097298 A1 WO2002097298 A1 WO 2002097298A1 GB 0202195 W GB0202195 W GB 0202195W WO 02097298 A1 WO02097298 A1 WO 02097298A1
Authority
WO
WIPO (PCT)
Prior art keywords
auto
trackway
balancing
grinding wheel
central aperture
Prior art date
Application number
PCT/GB2002/002195
Other languages
French (fr)
Inventor
Donald Paul Smith
Stephen Imeson
Original Assignee
Far East Abrasives Limited
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 Far East Abrasives Limited filed Critical Far East Abrasives Limited
Publication of WO2002097298A1 publication Critical patent/WO2002097298A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/16—Bushings; Mountings
    • B24D5/165—Balancing means
    • 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
    • B24B41/042—Balancing mechanisms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/32—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels
    • F16F15/36—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved
    • F16F15/363—Correcting- or balancing-weights or equivalent means for balancing rotating bodies, e.g. vehicle wheels operating automatically, i.e. where, for a given amount of unbalance, there is movement of masses until balance is achieved using rolling bodies, e.g. balls free to move in a circumferential direction

Definitions

  • the present invention relates to the auto-balancing of angle grinders or the like.
  • Rotary systems including angle grinders, are often in a state of imbalance that leads to vibration of the machine. Operators using vibrating machines can develop a condition known as "vibration white finger" as the fingers, and particularly the nerve endings, are damaged by this vibration. Systems have therefore been developed to reduce this vibration. Typically such systems involve providing an annular trackway concentric with the rotation axis of the rotary system and providing freely rolling bodies in this trackway. When the rotary system is in operation the rolling bodies will automatically find their appropriate angular position in the trackway to compensate for the inherent imbalance of the system. Such auto-balancing devices have proved to reduce the vibration in a rotary system.
  • an auto-balancing device is properly centred around the axis of rotation to ensure maximum balancing effect and thus maximum vibration reduction.
  • auto-balancing devices are built into rotary devices. However many such devices do not incorporate these auto- balancers.
  • the object of the present invention is to provide an auto-balancing device suitable for use as a retro-fit on a rotary device.
  • an auto-balancing unit for an angle grinder or similar rotary device including a threaded shaft on the central axis of the device for receiving a grinding wheel or the like, and securing the grinding wheel to the grinder
  • the auto-balancing unit comprising:- a body having an annular trackway open from one side, for receiving and movement of spherical weights, the open edge of the trackway being formed to accept a lid; and a central aperture; a lid sized to close the body; and a clamping flange being internally threaded for securing to the threaded shaft on the central axis of angle grinder, for clamping a grinding wheel or the like and having an extension being sized to be a tight fit with the central aperture of the body.
  • weights typically ball bearings
  • body of the auto-balancer In use a number of spherical weights, typically ball bearings, are placed into the body of the auto-balancer. It has been found that five weights achieve good results, although other numbers of weights can be used. A small quantity of oil or grease is added to the weights and the body is sealed with an annular seal.
  • a grinding wheel is normally secured to the machine shaft between two mounting flanges which fit onto or over the machines central exposed drive shaft.
  • the flange furthest from the main body of the machine has a threaded aperture.
  • the flange closest to the main body has a loose fit aperture.
  • the auto- balancing unit of the present invention is designed to replace the flange closest to the body of the machine and perform the fame function as this flange in securing the wheel to the machine.
  • the aperture of the auto-balancing unit is placed over the threaded machine shaft.
  • the aperture of the grinding wheel is then fitted over the threaded machine shaft and then the grinding wheel is secured to the machine by tightening the threaded aperture onto the threaded machine shaft.
  • the auto-balancing device will be made of metal, but any other substance can be used.
  • the auto-balancing device will be made of metal, but any other substance can be used.
  • Figure 1 is a cross-sectional view of an anti-vibration unit according to the present invention.
  • Figure 2 is a top view of the anti-vibration unit of Figure 1;
  • Figure 3 is a bottom view of the anti-vibration unit.
  • Figure 4 is the anti-vibration unit of Figure 1 for securing to an angle grinder or the like.
  • the anti-vibration unit 1 thereshown comprises a circular body 2, having an annular trackway 4 machined into the body 2 and a central aperture 5.
  • the trackway 4 is sized to allow a number of ball-bearings 6 to roll around the trackway in use.
  • a lid 10 for the body is also provided in the form of a disc 12 having a central aperture.
  • a small amount of oil or grease is placed in the trackway 4.
  • the ball bearings, usually 5 or 7, are placed in the trackway 4 and the lid 10 is placed on top to seal the body 4.
  • the central aperture 5 of the anti-vibration unit 1 is of a different size and shape on one face 15 of the unit from that of the other face 16.
  • a lip 17 is provided in the aperture between the sections of differing size 15, 16.
  • a modified securing flange 24 is also provided to secure the device 1 to an angle grinder or the like.
  • the flange 24 is threaded internally 26 for connection to a central shaft of the angle grinder 30.
  • the flange 24 also has extensions 28 sized as a tight fit into one of the diameters 15 of the central aperture 5 of the unit. This ensures that the unit is fully centred on the central axis of the angle grinder or the like.
  • the flange is reversible to allow for different sizes of grinding wheel 18.
  • the anti-vibration unit 1 is fitted over a central shaft 30 of an angle grinder or the like (not shown).
  • the shaft is provided with machined flats 32 and the opening 15 of the central aperture 5 is sized and shaped to fit the machined flats 32 thus ensuring that the anti-vibration unit rotates at the same speed as the machine shaft.
  • the grinding wheel 18 is then fitted over the machine shaft 30 and onto the anti-vibration unit 1.
  • the securing flange is then fitted onto the machine shaft, the thread 26 on the flange engaging with a threaded end 34 of the machine shaft.
  • the opening 16 on the other face of the central aperture 5 of the unit 1 is sized for receiving the extension 28 of the flange 24 as a tight fit ensuring centralisation of the anti-vibration unit 1.

Abstract

An auto-balancing device (1) for damping the vibrations produced by a grinding wheel (18) on an angle grinder (30). The device includes a body (2) having a trackway (4) allowing ball bearings (6) to distribute themselves around the trackway (4). A lid (10) holds the ball bearings (6) in the trackway (4) and the body (2) has a central aperture (5) sized to fit around the shaft (32) of an angle grinder. A clamping flange (24) is provided for securing the device to the angle grinder. The clamping flange is provided with an extension (28) for extending through the central aperture on a grinding wheel, the central aperture on the auto-balancing device, and onto the shaft of the angle grinder.

Description

Anti-Nibration Unit
The present invention relates to the auto-balancing of angle grinders or the like.
Rotary systems, including angle grinders, are often in a state of imbalance that leads to vibration of the machine. Operators using vibrating machines can develop a condition known as "vibration white finger" as the fingers, and particularly the nerve endings, are damaged by this vibration. Systems have therefore been developed to reduce this vibration. Typically such systems involve providing an annular trackway concentric with the rotation axis of the rotary system and providing freely rolling bodies in this trackway. When the rotary system is in operation the rolling bodies will automatically find their appropriate angular position in the trackway to compensate for the inherent imbalance of the system. Such auto-balancing devices have proved to reduce the vibration in a rotary system.
It is essential that an auto-balancing device is properly centred around the axis of rotation to ensure maximum balancing effect and thus maximum vibration reduction. To achieve correct centring of the device, auto-balancing devices are built into rotary devices. However many such devices do not incorporate these auto- balancers.
The object of the present invention is to provide an auto-balancing device suitable for use as a retro-fit on a rotary device.
According to the present invention there is provided an auto-balancing unit for an angle grinder or similar rotary device including a threaded shaft on the central axis of the device for receiving a grinding wheel or the like, and securing the grinding wheel to the grinder, the auto-balancing unit comprising:- a body having an annular trackway open from one side, for receiving and movement of spherical weights, the open edge of the trackway being formed to accept a lid; and a central aperture; a lid sized to close the body; and a clamping flange being internally threaded for securing to the threaded shaft on the central axis of angle grinder, for clamping a grinding wheel or the like and having an extension being sized to be a tight fit with the central aperture of the body.
In use a number of spherical weights, typically ball bearings, are placed into the body of the auto-balancer. It has been found that five weights achieve good results, although other numbers of weights can be used. A small quantity of oil or grease is added to the weights and the body is sealed with an annular seal.
In a standard angle grinder or the like a grinding wheel is normally secured to the machine shaft between two mounting flanges which fit onto or over the machines central exposed drive shaft.
The flange furthest from the main body of the machine has a threaded aperture. The flange closest to the main body has a loose fit aperture. The auto- balancing unit of the present invention is designed to replace the flange closest to the body of the machine and perform the fame function as this flange in securing the wheel to the machine.
The aperture of the auto-balancing unit is placed over the threaded machine shaft. The aperture of the grinding wheel is then fitted over the threaded machine shaft and then the grinding wheel is secured to the machine by tightening the threaded aperture onto the threaded machine shaft.
Due to a designed fit condition between a specific aperture in the auto- balancing unit and an extension to the threaded flange of the auto-balancing unit is fully centred.
Preferably the auto-balancing device will be made of metal, but any other substance can be used. To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawings, in which:
Figure 1 is a cross-sectional view of an anti-vibration unit according to the present invention;
Figure 2 is a top view of the anti-vibration unit of Figure 1;
Figure 3 is a bottom view of the anti-vibration unit; and
Figure 4 is the anti-vibration unit of Figure 1 for securing to an angle grinder or the like.
Referring to Figures 1, 2 and 3 the anti-vibration unit 1 thereshown comprises a circular body 2, having an annular trackway 4 machined into the body 2 and a central aperture 5. The trackway 4 is sized to allow a number of ball-bearings 6 to roll around the trackway in use.
A lid 10 for the body is also provided in the form of a disc 12 having a central aperture. In use a small amount of oil or grease is placed in the trackway 4. The ball bearings, usually 5 or 7, are placed in the trackway 4 and the lid 10 is placed on top to seal the body 4.
The central aperture 5 of the anti-vibration unit 1 is of a different size and shape on one face 15 of the unit from that of the other face 16. A lip 17 is provided in the aperture between the sections of differing size 15, 16.
A modified securing flange 24 is also provided to secure the device 1 to an angle grinder or the like. The flange 24 is threaded internally 26 for connection to a central shaft of the angle grinder 30. The flange 24 also has extensions 28 sized as a tight fit into one of the diameters 15 of the central aperture 5 of the unit. This ensures that the unit is fully centred on the central axis of the angle grinder or the like. The flange is reversible to allow for different sizes of grinding wheel 18.
Referring now to Figure 4, in use the anti-vibration unit 1 is fitted over a central shaft 30 of an angle grinder or the like (not shown). The shaft is provided with machined flats 32 and the opening 15 of the central aperture 5 is sized and shaped to fit the machined flats 32 thus ensuring that the anti-vibration unit rotates at the same speed as the machine shaft.
The grinding wheel 18 is then fitted over the machine shaft 30 and onto the anti-vibration unit 1. The securing flange is then fitted onto the machine shaft, the thread 26 on the flange engaging with a threaded end 34 of the machine shaft. The opening 16 on the other face of the central aperture 5 of the unit 1 is sized for receiving the extension 28 of the flange 24 as a tight fit ensuring centralisation of the anti-vibration unit 1.

Claims

CLAIMS:
1. An auto-balancing unit for an angle grinder or similar rotary device including a threaded shaft on the central axis of the device for receiving a grinding wheel or the like, and securing the grinding wheel to the grinder, the auto-balancing unit comprising:-
• a body having
• an annular trackway open from one side, for receiving and movement of spherical weights, the open edge of the trackway being formed to accept a lid; and • a central aperture;
• a lid sized to close the body; and
• a clamping flange being internally threaded for securing to the threaded shaft on the central axis of angle grinder, for clamping a grinding wheel or the like and having at least one extension being sized to fit with the central aperture of the body.
2. An auto-balancing device as claimed in claim 1, further including a number of spherical weights for placement in the annular trackway.
3. An auto-balancing device as claimed in claim 2, wherein the number of spherical weights is five.
4. An auto-balancing device as claimed in claim 1, claim 2 or claim 3, wherein the clamping flange extension is sized to be a tight fit with the central aperture of the body.
5. An auto-balancing device as claimed in any preceding claim, wherein the device is made from metal.
6. An auto-balancing device substantially as hereinbefore described with reference to
Figures 1-4 of the accompanying drawings.
PCT/GB2002/002195 2001-05-25 2002-05-20 Anti-vibration unit WO2002097298A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0112744.8 2001-05-25
GB0112744A GB0112744D0 (en) 2001-05-25 2001-05-25 Anti-vibration unit

Publications (1)

Publication Number Publication Date
WO2002097298A1 true WO2002097298A1 (en) 2002-12-05

Family

ID=9915273

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2002/002195 WO2002097298A1 (en) 2001-05-25 2002-05-20 Anti-vibration unit

Country Status (2)

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GB (1) GB0112744D0 (en)
WO (1) WO2002097298A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053903A2 (en) * 2003-12-06 2005-06-16 Robert Bosch Gmbh Hand grinder, flange for accommodating a grinding tool, and balancing unit
EP1738865A1 (en) * 2005-06-29 2007-01-03 August Rüggeberg GmbH & Co. KG Tool holder for rotatable tools
WO2012055642A1 (en) * 2010-10-29 2012-05-03 Robert Bosch Gmbh Runoff safety device
DE102004032177B4 (en) * 2004-07-02 2016-07-07 Robert Bosch Gmbh Vibration damping device, in particular for a power hand tool, and transmission with such a vibration damping device
CN110281102A (en) * 2019-06-24 2019-09-27 京东方科技集团股份有限公司 Wiper mechanism and cleaning method
CN111408999A (en) * 2019-01-08 2020-07-14 苏州宝时得电动工具有限公司 Pressing plate flange and angle grinder with same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950897A (en) * 1973-11-19 1976-04-20 Gebr. Hofmann Kg Multi-chambered fluid balancing apparatus
US4683681A (en) * 1986-08-12 1987-08-04 Russ Iii Peter J Grinding wheel with balancing ring
KR20010007867A (en) * 2000-10-12 2001-02-05 김종옥 Automatic balancing apparatus for grinding wheels

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3950897A (en) * 1973-11-19 1976-04-20 Gebr. Hofmann Kg Multi-chambered fluid balancing apparatus
US4683681A (en) * 1986-08-12 1987-08-04 Russ Iii Peter J Grinding wheel with balancing ring
KR20010007867A (en) * 2000-10-12 2001-02-05 김종옥 Automatic balancing apparatus for grinding wheels
WO2002030620A1 (en) * 2000-10-12 2002-04-18 Kweon, Cheong-Hyeon Wheel grinder and balancing apparatus for the same

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053903A2 (en) * 2003-12-06 2005-06-16 Robert Bosch Gmbh Hand grinder, flange for accommodating a grinding tool, and balancing unit
WO2005053903A3 (en) * 2003-12-06 2005-09-01 Bosch Gmbh Robert Hand grinder, flange for accommodating a grinding tool, and balancing unit
DE102004032177B4 (en) * 2004-07-02 2016-07-07 Robert Bosch Gmbh Vibration damping device, in particular for a power hand tool, and transmission with such a vibration damping device
EP1738865A1 (en) * 2005-06-29 2007-01-03 August Rüggeberg GmbH & Co. KG Tool holder for rotatable tools
WO2012055642A1 (en) * 2010-10-29 2012-05-03 Robert Bosch Gmbh Runoff safety device
CN103180102A (en) * 2010-10-29 2013-06-26 罗伯特·博世有限公司 Runoff safety device
US9073127B2 (en) 2010-10-29 2015-07-07 Robert Bosch Gmbh Runoff safety device
RU2587006C2 (en) * 2010-10-29 2016-06-10 Роберт Бош Гмбх Safety device for preventing spontaneous separation of clamp element and/or working tool
CN111408999A (en) * 2019-01-08 2020-07-14 苏州宝时得电动工具有限公司 Pressing plate flange and angle grinder with same
CN110281102A (en) * 2019-06-24 2019-09-27 京东方科技集团股份有限公司 Wiper mechanism and cleaning method

Also Published As

Publication number Publication date
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