EP0459697B1 - Powered tool with improved locking flange - Google Patents

Powered tool with improved locking flange Download PDF

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Publication number
EP0459697B1
EP0459697B1 EP19910304641 EP91304641A EP0459697B1 EP 0459697 B1 EP0459697 B1 EP 0459697B1 EP 19910304641 EP19910304641 EP 19910304641 EP 91304641 A EP91304641 A EP 91304641A EP 0459697 B1 EP0459697 B1 EP 0459697B1
Authority
EP
European Patent Office
Prior art keywords
collar
shaft
ring nut
machine tool
accordance
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
EP19910304641
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0459697A1 (en
Inventor
Guiseppe L. Cuneo
Sergio Bonacina
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0459697A1 publication Critical patent/EP0459697A1/en
Application granted granted Critical
Publication of EP0459697B1 publication Critical patent/EP0459697B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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 ring nut is generally screwed onto the threaded end of said shaft so as to clamp the tool between a surface thereof and a complementary surface projecting radially from the shaft. Because of the resistance to rotation exerted on the periphery of the tool during use and sudden changes of peripheral speed, e.g. upon starting, the ring nut tends to tighten progressively and this requires a relatively strong force to unscrew it subsequently but this is made difficult by the idling rotation of the shaft when the machine is turned off.
  • EP-A-231500 is disclosed a machine tool of the type comprising a threaded end projecting from a powered shaft to fasten coaxially to the shaft a rotating tool by tightening of a ring nut on said threaded end and a collar is mounted on the shaft resting axially on a radial projection of the shaft.
  • a roller bearing is interposed between the collar and radial projection and the ring nut is on the threaded end to clamp the tool against the front surface of the collar.
  • a machine tool comprises a threaded end projecting from a powered shaft to fasten coaxially to the shaft a rotating tool by tightening of a ring nut on said threaded end and a collar is mounted on the shaft resting axially on a radial projection of the shaft, and a roller bearing interposed between said collar and radial projection, the ring nut being screwed to the threaded end to clamp the tool against the front surface of the collar, characterised in that coupling means are placed between the ring nut and the collar and between the collar and the shaft there are means of unidirectional constraint upon rotation for free rotation of the collar in the direction of loosening the ring nut, and there also being provided manual control means for deactivation of the unidirectional constraint means.
  • FIG. 1 a portable machine tool (shown only partially since the rest belongs to the known art) in accordance with the invention which comprises a casing 21 from which projects a threaded end 10 of a powered shaft 22 supported in a rotating manner by a bearing 23 and comprising a device indicated generally by reference number 24 for intentional facilitated loosening and locking against accidental loosening of a ring nut 18 which fastens a tool 20.
  • the device 10 comprises a collar 16 positioned coaxially with the shaft 22 and in contact therewith through a roller bearing 17 opposite a projection radial to the shaft.
  • the end 10 of the shaft 22 is axially drilled and receives in a sliding manner a control rod 11 having at the top a control end in the form of a pushbutton and the opposite end 25 rounded to constitute a thrust surface for two pins 12 sliding in a direction radial to the shaft to act against two levers 13 directed virtually in a direction tangent to the collar and moving on pivots under the effect of springs 14 to engage with a toothed surface 15 internally circumferential to the collar 16 as may be seen in Figure 2.
  • a thrust spring 29 holds the rod 11 normally in the raised position so that the pins 12 do not thrust the levers 13, which, being thrust by the respective springs 14, maintain their opposite ends engaged with the teeth 15.
  • the ring nut 18 has at the bottom teeth 19 engaging in corresponding seats 26 (well shown in Figure 3 in which is seen a plan view of the part 24 of the device) in a plate element 30 sliding axially in the collar 16.
  • the plate 30 has radial tongues 31 sliding in grooves 32 under the thrust of springs 33.
  • a stop ring 34 prevents the plate 30 from coming out of the collar 16.
  • the collar can rotate freely in the direction of tightening of the ring nut, the levers 13 being arranged so as to slide with their free end on the teeth 15 in said direction. Contrarily, an attempt to rotate in the opposite direction, loosening the ring nut, is prevented by the engagement under the thrust of the springs 14 of the end of each lever 13 in a tooth of the toothed surface 15, as may be readily imagined by those skilled in the art.
  • the collar 16 becomes free to rotate even in the direction of loosening of the ring nut.
  • the ring nut can thus be easily loosened thanks to the presence of the roller bearing 17 which supports the axial thrust resulting from even extreme tightening of the ring nut caused by the forces in play during use of the machine.
  • control rod 11 is shown in the drawings with the operating pushbuttom emerging from the threaded end 10 of the shaft 22. But it is easy to imagine the possibility of placing said control rod 11 directed in the opposite direction along the shaft 22 so that the control button appears on the side of the machine opposite the threaded end 10.
  • the invention can be employed to fasten to a machine tool any type of rotating element, e.g. an abrasive or polishing disc, a grind stone, a circular saw, etc.
  • a machine tool any type of rotating element, e.g. an abrasive or polishing disc, a grind stone, a circular saw, etc.

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)
  • Clamps And Clips (AREA)
EP19910304641 1990-05-25 1991-05-21 Powered tool with improved locking flange Expired - Lifetime EP0459697B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2125490U 1990-05-25
IT2125490U IT219695Z2 (it) 1990-05-25 1990-05-25 Utensile motorizzato con flangia perfezionata di bloccaggio

Publications (2)

Publication Number Publication Date
EP0459697A1 EP0459697A1 (en) 1991-12-04
EP0459697B1 true EP0459697B1 (en) 1994-09-14

Family

ID=11179096

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910304641 Expired - Lifetime EP0459697B1 (en) 1990-05-25 1991-05-21 Powered tool with improved locking flange

Country Status (3)

Country Link
EP (1) EP0459697B1 (it)
DE (1) DE69103960T2 (it)
IT (1) IT219695Z2 (it)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10205848C2 (de) * 2002-02-13 2003-12-04 Metabowerke Gmbh Spannmutter zum Fixieren eines scheibenförmigen Werkzeugs
DE102014102705B4 (de) 2014-02-28 2020-06-18 Metabowerke Gmbh Spannmutter
KR20180098559A (ko) * 2015-12-25 2018-09-04 뉴 레지스톤 가부시키가이샤 연삭 장치 및 연삭 장치용 연삭구

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729038A (en) * 1953-10-30 1956-01-03 Alma A Hutchins Rotary abrading machine heads
US2800751A (en) * 1956-04-04 1957-07-30 Black & Decker Mfg Co Feather edger
DE3603384A1 (de) * 1986-02-05 1987-08-06 Bosch Gmbh Robert Vorrichtung zum loesbaren befestigen eines scheibenfoermigen werkzeugs
DE3903767A1 (de) * 1989-02-09 1990-08-16 Licentia Gmbh Einrichtung zum manuellen einspannen und entlasten scheibenfoermiger bearbeitungswerkzeuge fuer elektrowerkzeuge
DE3903765A1 (de) * 1989-02-09 1990-08-16 Licentia Gmbh Schnellspanneinrichtung fuer scheibenfoermige bearbeitungswerkzeuge von elektrowerkzeugen

Also Published As

Publication number Publication date
DE69103960T2 (de) 1995-02-09
IT9021254V0 (it) 1990-05-25
DE69103960D1 (de) 1994-10-20
EP0459697A1 (en) 1991-12-04
IT9021254U1 (it) 1991-11-26
IT219695Z2 (it) 1993-04-26

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