EP1714739A1 - Ponceuse portative - Google Patents

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Publication number
EP1714739A1
EP1714739A1 EP05252431A EP05252431A EP1714739A1 EP 1714739 A1 EP1714739 A1 EP 1714739A1 EP 05252431 A EP05252431 A EP 05252431A EP 05252431 A EP05252431 A EP 05252431A EP 1714739 A1 EP1714739 A1 EP 1714739A1
Authority
EP
European Patent Office
Prior art keywords
sanding
drive shaft
rotary
rotary drive
restrainable
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.)
Withdrawn
Application number
EP05252431A
Other languages
German (de)
English (en)
Inventor
Gianni Borinato
Shisong Zhang
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.)
Positec Power Tools Suzhou Co Ltd
Original Assignee
Positec Power Tools Suzhou Co Ltd
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 Positec Power Tools Suzhou Co Ltd filed Critical Positec Power Tools Suzhou Co Ltd
Priority to EP05252431A priority Critical patent/EP1714739A1/fr
Publication of EP1714739A1 publication Critical patent/EP1714739A1/fr
Withdrawn legal-status Critical Current

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    • 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
    • B24B23/03—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor the tool being driven in a combined movement
    • 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
    • B24B23/04—Portable grinding machines, e.g. hand-guided; Accessories therefor with oscillating grinding tools; Accessories therefor

Definitions

  • the present invention relates to a sanding tool capable of selectively performing regular orbital sanding or random orbital sanding.
  • an oscillating disc In a conventional random orbital sander, an oscillating disc is driven by a rotary drive element and can rotate with respect to the rotary drive shaft to perform a coarse sanding operation. In a conventional regular orbital sander, an oscillating disc is driven by a rotary drive element and can perform a fine sanding operation.
  • US-A-6132300 discloses a dual function sander with a connection means including a plurality of rigid elements and a plurality of flexible columns which are axially interengageable. Oscillating plates may be selectively mounted on the sander by the connection means to perform orbital sanding or random orbital sanding.
  • the connection means is complex to manufacture, the flexible columns are easily invalidated and high quality materials are required.
  • the connection means are exposed to torsional forces imparted by frictional torque between the bearing and the drive shaft.
  • the present invention seeks to improve the operability and longevity of a dual function sanding tool by selectively restraining a rotary sanding element in a radial plane. More particularly, the present invention relates to a sanding tool with restraining elements resiliently mounted in the radial plane between the restrainable rotary sanding element and the skirt of the housing.
  • a sanding tool comprising:
  • the housing comprises an upper housing part and a lower housing part.
  • the upper housing part generally houses the motor.
  • the lower housing part generally houses the first rotary drive shaft and the second rotary drive shaft.
  • the bearing may support the second rotary drive shaft in a fan (eg a cooling fan and/or an exhaust fan).
  • the first rotary drive shaft may be supported at an upper end by an upper bearing.
  • the skirt is a distinguishable edge of the lower housing of any suitable shape.
  • the housing (eg the lower housing part) comprises a substantially bell-shaped body terminating at its basal end in a substantially truncated square skirt bounding the mouth.
  • the or each elastic restraining element may be fixed to one of the restrainable rotary sanding element and the skirt and biased against the other of the restrainable rotary sanding element and the skirt.
  • the or each elastic restraining element may be fixed to the restrainable rotary sanding element and the skirt.
  • a first pair of internal platforms diametrically opposed relative to the second axis extend from the inner face of the skirt and a second pair of internal platforms diametrically opposed relative to the second axis extend from the inner face of the skirt.
  • a third pair of internal platforms diametrically opposed relative to the second axis extend from the inner face of the skirt and a fourth pair of internal platforms diametrically opposed relative to the second axis extend from the inner face of the skirt.
  • Each of the first, second, third and fourth pair of internal platforms may be any suitable shape.
  • Each of the first, second, third and fourth pair of internal platforms may be parallel to the skirt.
  • the first, second, third and fourth pair of internal platforms may be mutually disposed in a substantially rectangular (eg square) configuration.
  • the housing terminates at its basal end in a substantially truncated square skirt bounding the mouth and each internal platform extends from the truncated portion of the truncated square skirt partially along and substantially parallel to the non-truncated portion of the truncated square skirt.
  • the inner face of the or each internal platform defines an engagement surface for engaging an elastic restraining element and the engagement surface of the or each pair of diametrically opposed internal platforms is substantially parallel.
  • the one or more elastic restraining elements are a plurality of elastic restraining elements, preferably a plurality of pairs of elastic restraining elements, particularly preferably a plurality of pairs of elastic restraining elements diametrically opposed relative to the second axis, especially preferably two pairs of elastic restraining elements diametrically opposed relative to the second axis.
  • each elastic restraining element is adapted to undergo restrained oscillatory displacement (eg wobble) along the skirt (eg along the engagement surface).
  • the elastic restraining element is substantially orthogonal to the engagement surface.
  • each elastic restraining element comprises:
  • the elastic restraining elements comprise:
  • the or each spring is fixed at a first end to a portion (eg an upstanding portion) of the restrainable rotary sanding element and is supported within a sleeve mounted on the upper surface of the restrainable rotary sanding element, wherein a second end of the or each spring opposite to the first end is connected to a contact member which is resiliently urged into contact with the skirt.
  • the contact member is a rolling member (eg a ball).
  • each spring is fixed at or near to the perimeter of the restrainable rotary sanding element
  • each spring is fixed at a first end to a portion (or portions) of the restrainable rotary sanding element and a second end opposite to the first end is in contact with adjacent internal platforms.
  • the spring may be an elongate folded spring.
  • the first end may be fixed to a portion (or portions) of the restrainable rotary sanding element by convention fastening members (eg screws).
  • the first end may be a substantially horizontal folded end portion.
  • the second end may be a substantially vertical folded end portion.
  • the restrainable rotary sanding element has a plurality of columns extending from its upper surface, each column houses a supporting spring and the supporting spring supports a supporting member to support the housing.
  • the supporting member is a rolling supporting member (eg a supporting ball).
  • the restrainable rotary sanding element is selectively replaceable with a non-restrainable rotary sanding element free to rotate about the second axis to perform a random orbit for coarse sanding.
  • the restrainable rotary sanding element may be a sanding shoe.
  • the non-restrainable rotary sanding element may be a sanding platen.
  • the restrainable rotary sanding element may be fastened to the foot of the second rotary drive shaft using any conventional fastener.
  • a sanding sheet is typically fixed to the restrainable rotary sanding element or the non-restrainable rotary sanding element in a conventional manner.
  • the restrainable rotary sanding element and the housing have no axially interengageable (eg mating) portions.
  • a sanding tool device comprising:
  • the present invention provides a restrainable rotary sanding element selectively fastenable to the foot of a second rotary drive shaft of a sanding tool device as defined hereinbefore, wherein the restrainable rotary sanding element is adapted so that between the restrainable rotary sanding element and the skirt are resiliently mountable one or more elastic restraining elements which in use apply a restoring torque to the second rotary drive shaft to resist the tendency of the second rotary drive shaft to rotate about the second axis so as to restrain the restrainable rotary sanding element in a regular orbit for fine sanding.
  • the sanding tool of the present invention includes generally a lower housing part 20, an upper housing part 2 and a motor (not shown) housed in the upper housing part 2.
  • the lower housing part 20 is a substantially bell-shaped body which terminates at its basal end in a substantially truncated square skirt 20a bounding a mouth.
  • the lower housing part 20 contains a first rotary drive shaft 6 and a second rotary drive shaft 12.
  • the first rotary drive shaft 6 is supported at an upper end by a first bearing 8 and is driven by the motor rotationally about a first axis 4.
  • the second rotary drive shaft 12 is supported by a second bearing 14 in a motor fan 7 which is mounted on the first rotary drive shaft 6 within the lower housing portion 20.
  • the motor fan 7 draws in air through the mouth of the lower housing portion 20.
  • the second rotary drive shaft 12 is rotational about a second axis 10 which is radially eccentric to the first axis 4.
  • a first pair of internal platforms 30a,a' diametrically opposed relative to the second axis 10 and a second pair of internal platforms 30b,b' diametrically opposed relative to the second axis 10 extend from the inner face of the truncated square skirt 20a.
  • each internal platform 30a,a',b,b' extends from the truncated portion of the truncated square skirt 20a partially along and substantially parallel to the non-truncated portion of the truncated square skirt 20a.
  • the inner face of each internal platform 30a,a',b,b' defines an engagement surface and the engagement surfaces of each pair of diametrically opposed internal platforms 30a,a' and 30b,b' are parallel.
  • a sanding shoe 22 is fastened to the foot of the second rotary drive shaft 12 by means of a pressing plate 16 and a locking screw 18.
  • a sanding sheet 24 with a plurality of holes is fixed to the basal face of the sanding shoe 22 in a conventional manner.
  • Elastic restraining elements 31a,a',b,b' mounted on the perimeter of the upper surface of the sanding shoe 22 are substantially orthogonal to and engage the respective engagement surfaces of the internal platforms 30a,a',b,b'. As described below, this engagement is capable of preventing the sanding shoe 22 from rotating about the second axis 10 so as to restrain the sanding shoe 22 in a regular orbit about the first axis 4 for fine sanding.
  • Each elastic restraining element 31 comprises a base 32 mounted on the upper surface of the sanding shoe 22 by a screw and a sleeve 36 set in the base 32. Contained in the sleeve 36 are a spring 38 fixed to the sanding shoe 22 and a ball 34 biased outwardly by the spring 38 into contact with the engagement surface.
  • the sanding shoe 22 rotates with respect to the first axis 4.
  • a frictional force is generated between the second bearing 14 and the second rotary drive shaft 12 which gives the sanding shoe 22 a tendency to rotate about the second axis 10.
  • the elastic force of the elastic restraining elements 31a,a',b,b' acting against the engagement surfaces generates the opposing torque.
  • the elastic restraining elements 31a,a',b,b' wobble against the respective engagement surfaces as they continuously equilibrate in response to the frictional torque.
  • the sanding shoe 22 has four columns 25 extending from its upper surface. Each column 25 houses a supporting spring 28 and the supporting spring 28 supports a supporting ball 26. Through the biasing action of the supporting spring 28, the supporting ball 26 serves to support the lower housing part 20.
  • a sanding shoe 22 is fastened to the foot of the second rotary drive shaft 12 by means of a pressing plate 16 and a locking screw 18.
  • a sanding sheet 24 with a plurality of holes is fixed to the basal face of the sanding shoe 22 in a conventional manner.
  • a first pair of internal platforms 30a,a' diametrically opposed relative to the second axis 10, a second pair of internal platforms 30b,b' diametrically opposed relative to the second axis 10, a third pair of internal platforms 30c,c' diametrically opposed relative to the second axis 10 and a fourth pair of internal platforms 30d,d' diametrically opposed relative to the second axis 10 extend from the inner face of the truncated square skirt 20a.
  • the first and second pair of internal platforms 30a,a',b,b' are as hereinbefore defined and the third and fourth pair of internal platforms 30c,c',d,d' are identical to the first and second pair of internal platforms 30a,a',b,b'.
  • each elastic restraining element 31a,a',b,b' comprises a long spring 50 composed of folded elastic material.
  • the springs 50 include a horizontal folding edge 40 fastened to the upper surface of the sanding shoe 22 at each end by a screw and a vertical folding edge 39 biased against adjacent internal platforms (eg 30a and 30b').
  • the frictional torque generated by the second bearing 14 and the second rotary drive shaft 12 is counterbalanced by the restoring torque applied by the elastic restraining elements 31 a,a',b,b' to the sanding shoe 22 about the second axis 10 so as to restrain the sanding shoe 22 in a regular orbit for fine sanding.
  • Figures 5 and Figure 6 illustrate an embodiment of the sanding tool device of the invention with a sanding platen 21 fastened to the foot of the second rotary drive shaft 12.
  • the sanding platen 21 is a regular circular shape.
  • the sanding platen 21 is free to rotate in an unrestrained manner about the second axis 10 to perform a random orbit for coarse sanding.
  • the elastic restraining element 31 helps to achieve a dual function with a simple structure at low cost. Because the distance between the elastic restraining element 31 and the housing 20 is small, the sanding tool exhibits little torsion. Thus the elastic restraining element 31 is less prone to invalidation and has a longer life.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP05252431A 2005-04-19 2005-04-19 Ponceuse portative Withdrawn EP1714739A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05252431A EP1714739A1 (fr) 2005-04-19 2005-04-19 Ponceuse portative

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP05252431A EP1714739A1 (fr) 2005-04-19 2005-04-19 Ponceuse portative

Publications (1)

Publication Number Publication Date
EP1714739A1 true EP1714739A1 (fr) 2006-10-25

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Family Applications (1)

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EP05252431A Withdrawn EP1714739A1 (fr) 2005-04-19 2005-04-19 Ponceuse portative

Country Status (1)

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EP (1) EP1714739A1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366493A1 (fr) * 2010-03-19 2011-09-21 Festool GmbH Machine-outil manuelle dotée d'un engrenage excentrique comprenant un moyen de guidage à angle de rotation
DE102016106782A1 (de) * 2016-04-13 2017-10-19 Festool Gmbh Hand-Werkzeugmaschine mit einer Abdeckeinrichtung
US10130229B2 (en) * 2013-03-28 2018-11-20 Yale Merret Smith Efficient surface treating machine
JP2019171562A (ja) * 2018-03-21 2019-10-10 グイド ヴァレンティーニＤｒ． Ｇｕｉｄｏ ＶＡＬＥＮＴＩＮＩ ワークピースにサンディングまたはポリッシングを行うための二つの異なるタイプの作業動作を実現するよう構成される手持ち型機械工具
EP3736084A1 (fr) * 2019-05-07 2020-11-11 Guido Valentini Outil électroportatif pour le ponçage ou le polissage d'une pièce à usiner
CN114714155A (zh) * 2022-03-14 2022-07-08 淮安精英电气科技有限公司 一种电动机加工用打磨装置及方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625462A (en) * 1984-08-29 1986-12-02 Makita Electric Works, Ltd. Cordless electric finishing sander
US4729194A (en) * 1985-05-25 1988-03-08 Festo Kg Balanced orbital sander/grinder
EP0713751A1 (fr) * 1994-11-25 1996-05-29 Black & Decker Inc. Outil oscillant à main amélioré
US6132300A (en) * 1994-07-26 2000-10-17 Black & Decker Inc. Dual function oscillating tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4625462A (en) * 1984-08-29 1986-12-02 Makita Electric Works, Ltd. Cordless electric finishing sander
US4729194A (en) * 1985-05-25 1988-03-08 Festo Kg Balanced orbital sander/grinder
US6132300A (en) * 1994-07-26 2000-10-17 Black & Decker Inc. Dual function oscillating tool
EP0713751A1 (fr) * 1994-11-25 1996-05-29 Black & Decker Inc. Outil oscillant à main amélioré

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2366493A1 (fr) * 2010-03-19 2011-09-21 Festool GmbH Machine-outil manuelle dotée d'un engrenage excentrique comprenant un moyen de guidage à angle de rotation
US10130229B2 (en) * 2013-03-28 2018-11-20 Yale Merret Smith Efficient surface treating machine
DE102016106782A1 (de) * 2016-04-13 2017-10-19 Festool Gmbh Hand-Werkzeugmaschine mit einer Abdeckeinrichtung
JP2019513570A (ja) * 2016-04-13 2019-05-30 フェスツール ゲーエムベーハー 被せ具を有する可搬機械工具
JP2022050454A (ja) * 2016-04-13 2022-03-30 フェスツール ゲーエムベーハー 被せ具を有する可搬機械工具
US11878384B2 (en) 2016-04-13 2024-01-23 Festool Gmbh Portable power tool having a covering device
JP2019171562A (ja) * 2018-03-21 2019-10-10 グイド ヴァレンティーニＤｒ． Ｇｕｉｄｏ ＶＡＬＥＮＴＩＮＩ ワークピースにサンディングまたはポリッシングを行うための二つの異なるタイプの作業動作を実現するよう構成される手持ち型機械工具
JP2020146834A (ja) * 2018-03-21 2020-09-17 グイド ヴァレンティーニＤｒ． Ｇｕｉｄｏ ＶＡＬＥＮＴＩＮＩ ワークピースにサンディングまたはポリッシングを行うための二つの異なるタイプの作業動作を実現するよう構成される手持ち型機械工具
EP3736084A1 (fr) * 2019-05-07 2020-11-11 Guido Valentini Outil électroportatif pour le ponçage ou le polissage d'une pièce à usiner
CN114714155A (zh) * 2022-03-14 2022-07-08 淮安精英电气科技有限公司 一种电动机加工用打磨装置及方法

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