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
  • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
  • B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
• • 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
  • B24B13/00—Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor
  • B24B13/01—Specific tools, e.g. bowl-like; Production, dressing or fastening of these 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
  • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B24—GRINDING; POLISHING
  • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
  • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
  • B24D7/16—Bushings; Mountings

Definitions

• Polishing tool comprising a drive plate and a removable pad for finishing an ophthalmic lens
• the invention relates to the field of polishing ophthalmic lenses.
• a rotary polishing tool for such a lens, this tool being intended to be mounted on the spindle of a polishing machine.
• the manufacture of an ophthalmic lens requires a polishing operation in which a rotating abrasive disc is held against the surface of the lens and sweeps the surface, the lens being itself driven. in rotation. It is therefore necessary to provide steps in which this abrasive disk is replaced by a new disc or a disc of a different grain.
• Polishing tools or the like are known to facilitate the replacement of an abrasive disc without having to disassemble the tool from the spindle of the polishing machine.
• Document DE 44 44 496 describes a rotary tool comprising a drive plate which rotates a member through a cross-shaped projection fitting into a recess complementary to the member. The body is held against the drive plate by magnets.
• the document WO 01/36157 describes a cutting tool whose cutting element is caught between two fastening members held against each other by means of an elastic ring which is integral with one of the fastening members. fastener and which is held against a shoulder provided on the other fastener.
• Document US Pat. No. 5,931,724 describes a polishing tool comprising a drive plate adapted to drive an abrasive disc in rotation by means of three projecting pinions of the drive plate which fit into three complementary orifices of the abrasive disc and thanks to three pivoting locking members adapted to maintain the abrasive disc against the drive member.
• WO 01/96067 discloses a polishing tool comprising a drive plate on which is removably mounted an abrasive disc with elastic tabs.
• the object of the invention is to improve this type of polishing tool which comprises a drive plate on which can be mounted removably an abrasive disc.
• the invention provides a polishing tool for finishing an ophthalmic lens, comprising: - a drive plate provided with mounting means on the spindle of a polishing machine;
• a removable polishing pad adapted to be rotated by the drive plate; characterized in that it further comprises - positioning means ensuring a radial immobilization of said pad relative to said plate and allowing axial sliding of the pad relative to the plate;
• - Retaining means limiting the axial sliding of the pad relative to the plate to a predetermined sliding range;
• Rotation stop means comprising at least one tooth adapted to engage in a notch of corresponding shape, the tooth and the notch being arranged one on the plate and the other on the pad.
• Such a polishing tool makes it possible to decouple the setting in position of the polishing pad and its rotation drive.
• the implementation of the polishing pad is facilitated by the fact that the intervention of the user is limited to the engagement of the polishing pad in the retaining means. It is in fact taken advantage of the force exerted by the spindle of the polishing machine on the ophthalmic lens to lock in rotation the polishing pad by means of stopping rotation.
• the polishing pad slides freely along the predetermined sliding range and only when the polishing pad is supported on the ophthalmic lens and start of rotation of the spindle that the tooth engages in the notch, at the moment when the tooth and the notch are placed opposite each other at the end of a relative rotation of the drive plate relative to to the polishing pad.
• the user is exempted from having to orient the pad angularly relative to the plate since the engagement of the tooth in the notch is done automatically.
• the polishing tool according to the invention may further comprise the following features, alone or in combination: the positioning means comprise a groove in which engages an elastic fixing lug, the groove and the fixing lug being arranged one on the plate and the other on the pad; the groove is circular and the fixing lugs are arranged in a circle so as to materialize a cylinder adapted to engage in the groove; the retaining means comprise a flange disposed in the groove, and a boss disposed on the bracket; the rotation stop means comprise a plurality of notches arranged in a circle and distributed regularly; - The rotation stop means comprise a plurality of teeth arranged in a circle and distributed regularly; the rotation stop means comprise as many notches as teeth; a surface is provided between the notches, this surface being adapted to allow the sliding of the teeth against this surface.
• FIG. 1 is a perspective view of a polishing tool according to the invention
• FIG. 2 is an exploded view of the polishing tool of FIG.
• FIG. 3 is a perspective view of the drive plate of the polishing tool of Figures 1 and 2;
• FIG. 4 is a perspective view of the polishing pad of the tool of FIGS. 1 and 2;
• FIG. 5 is a perspective view of the polishing tool of Figure 1 in a diametral section
• FIG. 6 is a front view of the section of Figure 5;
• Figure 1 shows the polishing tool 1 ready to be mounted on the rotating spindle of a polishing machine.
• the type of polishing machine for which the tool 1 is provided is adapted to impart a rotational movement to a tool mounted on its spindle while exerting a pressure force on the tool, during its rotation, against the surface of the lens ophthalmic to polish.
• This pressure force is generally exerted by a pressure agent such as compressed air.
• FIG. 2 The exploded view of FIG. 2 makes it possible to distinguish the constituents of the polishing tool 1.
• the tool 1 comprises indeed a ball joint 2 having a threaded bore
• a drive plate 4 is fixed to the ball 2 and a polishing pad 5 is attached to the drive plate 4.
• a polishing pad 6 is further fixed on the polishing pad 5.
• the polishing pad has an abrasive surface 7 providing the effective polishing operation by contacting the surface of the lens to be polished.
• FIG. 3 shows in perspective the driving plate 4, viewed from below with respect to its position in FIG. 2.
• the drive plate 4 is in the form of a cylinder which has a groove 8 on its periphery.
• the driving plate 4 also comprises, on its visible face in FIG. 3 (that is to say on its face opposite to the ball 2), a circular groove 9 extending in the same direction as the cylinder forming the drive plate 4.
• the inner edges of this groove 9 comprise a flange 10 projecting transversely to the groove 9 at the surface of the drive plate 4.
• Six teeth 11 of rectangular section are further disposed around the periphery of this surface of the drive plate 4.
• the circular groove 9 delimits a central abutment 12 flush with the same level as the teeth 11.
• FIG. 4 shows in perspective the polishing pad 5 intended to cooperate with the drive plate 4, the polishing pad 5 being in the position which is its position in FIG. 2.
• the polishing pad 5 is a rigid disk comprising resiliently deformable and transversely protruding fixing tabs 13 disposed all around the pad 5 so as to materialize a cylinder adapted to engage in the circular groove 9 of the drive plate 4.
• Each of the fastening lugs 13 has a boss 14 facing inwards.
• the polishing pad 5 also has notches 15 disposed over the entire circumference of the pad 5, outside the cylinder materialized by the fastening tabs 13. These notches 15 are adapted to the engagement of the teeth 11 of the drive plate 4 and have a depth at least equal to the height of the teeth 11.
• FIGS. 5 and 6 show the cooperation of the patella 2, the plate 4 and the polishing pad 5.
• the drive plate 4 is thus fixed on the ball 2 by any known means, the ball 2 receiving a circular seal 17 engaging in the groove 8 of the drive plate 4.
• the fixing lugs 13 of the polishing pad 5 are engaged in the circular groove 9 of the drive plate 4 so that the plate 4 is immobilized radially relative to the shoe 5 but can slide axially along a sliding range which is limited by the abutment bosses 14 against the flange 10.
• the polishing tool 1 is used in the following manner.
• the drive plate 4 and its ball 2 are first mounted on the spindle of the polishing machine. These elements are intended to remain stationary on the spindle of the machine, only the change of the polishing pad 5 is necessary to replace a used polishing pad 6 or to change the polishing characteristics.
• the polishing pad 5 is then engaged in the drive plate 4 so that the fastening tabs 13 deform so that the bosses can penetrate into the groove 9 by passing through the collar 10 without taking into account the relative position of the teeth 11 and notches 15.
• the intervention of the user is limited to this commitment.
• the polishing pad 5, although retained in the groove 9 can not be rotated at this stage.
• the polishing tool 1 is then placed in position against the surface of the ophthalmic lens to be machined and the rotation of the spindle is activated simultaneously or subsequently.
• the teeth 11 then slide on the pad 5 until they engage automatically in the notches 15.
• the rotation drive of the pad 5 starts and the polishing operation is continued in a conventional manner.
• the polishing pad 5 can be used directly, without polishing pad, it then itself comprises an abrasive surface.
• the teeth 11 and the notches 15 may have a different form from that described here, it is sufficient that their mutual commitment is allowed.
• the position of the teeth 11 and notches 15 can be further inverted so that the teeth 11 are attached to the pad 5 and the notches 15 are formed on the plate 4. The same is true for the groove 9 and the tabs 13 .

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Polishing Bodies And Polishing Tools (AREA)
• Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
• Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=34948072

Family Applications (1)

Country Status (7)

Families Citing this family (11)

Family Cites Families (27)

• 2004
  • 2004-09-10 FR FR0409636A patent/FR2875155B1/fr not_active Expired - Fee Related
• 2005
  • 2005-09-01 EP EP05800555A patent/EP1796874B1/de active Active
  • 2005-09-01 US US11/662,075 patent/US8029341B2/en active Active
  • 2005-09-01 AT AT05800555T patent/ATE396830T1/de not_active IP Right Cessation
  • 2005-09-01 JP JP2007530734A patent/JP4814884B2/ja not_active Expired - Fee Related
  • 2005-09-01 WO PCT/FR2005/002182 patent/WO2006030091A1/fr active IP Right Grant
  • 2005-09-01 DE DE602005007259T patent/DE602005007259D1/de active Active

Non-Patent Citations (1)

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