US3794314A - Vacuum chuck for ophthalmic lens finishing machinery - Google Patents

Vacuum chuck for ophthalmic lens finishing machinery Download PDF

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Publication number
US3794314A
US3794314A US00217469A US3794314DA US3794314A US 3794314 A US3794314 A US 3794314A US 00217469 A US00217469 A US 00217469A US 3794314D A US3794314D A US 3794314DA US 3794314 A US3794314 A US 3794314A
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United States
Prior art keywords
lens
vacuum source
vacuum
lens blank
gasket
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
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US00217469A
Inventor
O Coburn
J Stith
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Gerber Coburn Optical Inc
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Coburn Optical Industries Inc
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Publication date
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Publication of US3794314A publication Critical patent/US3794314A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B11/00—Work holders not covered by any preceding group in the subclass, e.g. magnetic work holders, vacuum work holders
    • B25B11/005—Vacuum work holders
    • B25B11/007—Vacuum work holders portable, e.g. handheld
    • 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
    • B24B13/005—Blocking means, chucks or the like; Alignment devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T279/00—Chucks or sockets
    • Y10T279/11—Vacuum

Definitions

  • a principal objective of this invention is to overcome the disadvantages of the prior-art blocking methods by securing the lens to a block by way of a vacuum.
  • the block itself is provided with means for orienting the lens therewith and is equipped with all other features common to and considered necessary for a lens block.
  • Another important objective of this invention is to provide a vacuum system for securing lens blanks which is readily used with fining, polishing, beveling and generating equipment now on the marketplace.
  • Another important objective of this invention is to provide a lens block having a flexible opening-adapted to receive one surface of a lens blank wherein this surface becomes a wall of a vacuum-cavity which is used to secure the lens to the block.
  • a still further objective of this invention is to provide a lens blocking system in which a lens block is provided having hardened steel inserts for lens equipment drive pins and vacuum drawn via flexible tubing so that the apparatus for the vacuum source will not hamper or otherwise interfere with the movement necessary to lens fining, polishing, and surface generation.
  • Another objective of this invention' is to provide a blocking system which does not require separate blocking equipment or the requirement for melting pitch or alloy.
  • a still further objective of the invention is to provide a blocking system which utilizes a vacuum source of a type which is oftentimes already available in a lens finishing laboratory.
  • FIG. 1 is an elevation view partially in section of a prior art block
  • FIG. 2 is a bottom plan view of the unit as shown in FIG. 1;
  • FIG. 3 is a plan view of a first embodiment of this in- 4 vention
  • a lens L is secured to a block 10 by way of an adhesive 12.
  • the member 10 can be steel or a formed-in-place metallic or plastic block.
  • the block is circular for ready reception in chucking equipment.
  • One of the surfaces is formed with detents or depressions l6 and 18 and oftentimes with a center detent 20. These detents oftentimes receive steel-hardened inserts to increase the longevity of the block.
  • FIGS. 3 through 7 A first embodiment of a block of this invention is shown in FIGS. 3 through 7.
  • the blank will again be indicated by the letter L.
  • a steel block 30 is provided having a circular boss or orienting protrusion 32 along one surface thereof. Its exterior cylindrical surface is indicated by the numeral 33.
  • the other surface of the block is formed with a dishshaped depression 34 which is circumscribed by a rim 36.
  • the rim 36 immediately below its top edge 38, is formed with an inwardly tapered edge 40.which receives the lens blank L.
  • the tapered edge 40 provides a shoulder for the lens blank.
  • an annular depression 42 receives a resilient plastic or rubber gasket member 44.
  • the gasket 44 together with the lens blank L and the depression 34 provides a sealed vacuum chamber 46.
  • a fitting 48 extends outwardly from the peripheral surface 33 and leads to a vacuum source 50 via a flexible tubing 52.
  • the block member 30 is formed with a passageway 54 leading to the vacuum source via fitting 48 and the flexible tubing 52.
  • the upper surface 38 of the rim 36 has indicia or alignment marks 56 and 58. These alignment marks are matched with indicia previously applied to the lens blank L. The marks'are so placed onthe lens blank by conventional means such as a marking pen or layout marker. 8
  • an equipment operator places the lens L as shown in FIG. 6 while orienting the alignment marks.
  • a switch activates the vacuum source 50 which causes chamber 46 to become a sealed vacuum holder.
  • the axial position of the lens is accurately .determined because the lens blank will engage the surface 40.
  • the rim 36 is notched at 56 for alignment with the lens generating chucking equipment.
  • FIGS. 7 and 8 A second embodiment of the invention is shownin FIGS. 7 and 8.
  • the blocking member has the vacuum source fitting 74 entering the center of the depression with hardened steel inlets and 72'for drive pins.
  • the rim 38 has indicia marks for alignment with the base curve of the lens. The center positioning of fitting 74 reduces vibrations when the block is used with polishing and fining machines of the type mentioned in assignee's co-pending application, Ser. No. 169,224, filed Aug. 5, 1971, entitled POLISHER- FINER MACHINE.
  • conduit system communicating said vacuum source with said cavity
  • said conduit system including a bore through said chucking member
  • a flexible hose communicating said bore and said vacuum source, whereby when a lens blank is placed in engagement with said gasket and said vacuum source draws a vacuum in said enclosed cavity, said lens blank seals against said gasket and is securely held to said chucking member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)

Abstract

A vacuum chucking system for securing and holding an ophthalmic lens blank without the requirement of forming a block to a surface thereof.

Description

United States Patent 1 1 v .1 1 3,794,314
, [73] Assignee: Coburn Optical Industries, Inc.,
Coburn et a1. 1 Feb. 26, 1974 [5 1 VACUUM CHUCK FOR OPHTHALMIC 1,503,390 7/1924 Tenney 269/21 x S FINISHING MACHINERY 2,688,220 9/1954 Boutell 51/235 3,015,196 1/1962 Campbell 51/284 [75] Inventors: Orin W. Coburn; Joe D. Stith, both 3,461,622 8/1969 Rayford 51 235 X ofMuskogee, Okla. 2,545,448 4/1951 Clement 51/284 X F APPLl Muskogee, Okla QREIGN PATENTS 0R CATIONS 1,014,564 6/1952 France 279/3 22 I Filed: Jan. 13, 1972 v 1 1211 Appl. No: 217,469 Primary Examiner James L. Jones, Jr. Assistant'Examiner-J. T; Zatarga 52 us. c1. ..,.....'269/21, 51/216 LP, 51/217 L, AmmeY, Byme 51/235, 51 /284, 279/3 51 1m.c1 B25b 11/00 [58] Field 0fSearch..269/2l; 51/235, 216 LP, 217 L, 1 1 RA A vacuum chucking system for securing and holding an ophthalmic lens blank without the requir er'nent of, 1 5 ,Reterenc-esvclted I forming a block to a surface thereof.
' UNITED STATES PATENTS 904,679 11/1908 Bruto'n 279/3 1 Claim, 8 Drawing Figures I I I I 1 1 Y 5 I y 44 r 42 34 VACUUM CHUCK FOR OPI-ITHALMICLENS FINISHING MACHINERY of pitch or the like. Another common method is forming a metallic block of a low-melting point alloy. In each of these methods, of course, the lens blank must be oriented with respect to the'block and after finishing 7 common lens blocking techniques of the prior art. In
the block must be removed and the lens cleaned. The
pitch or alloy must be recovered for economic reasons.
A principal objective of this invention is to overcome the disadvantages of the prior-art blocking methods by securing the lens to a block by way of a vacuum. The block itself is provided with means for orienting the lens therewith and is equipped with all other features common to and considered necessary for a lens block.
Another important objective of this invention is to provide a vacuum system for securing lens blanks which is readily used with fining, polishing, beveling and generating equipment now on the marketplace.
Another important objective of this invention is to provide a lens block having a flexible opening-adapted to receive one surface of a lens blank wherein this surface becomes a wall of a vacuum-cavity which is used to secure the lens to the block.
A still further objective of this invention is to provide a lens blocking system in which a lens block is provided having hardened steel inserts for lens equipment drive pins and vacuum drawn via flexible tubing so that the apparatus for the vacuum source will not hamper or otherwise interfere with the movement necessary to lens fining, polishing, and surface generation.
Another objective of this invention'is to provide a blocking system which does not require separate blocking equipment or the requirement for melting pitch or alloy.
A still further objective of the invention is to provide a blocking system which utilizes a vacuum source of a type which is oftentimes already available in a lens finishing laboratory.
These and other objects of the invention will become more apparent to those skilled in the art by reference to the following detailed description when viewed in light of the accompanying drawings wherein:
FIG. 1 is an elevation view partially in section of a prior art block;
FIG. 2 is a bottom plan view of the unit as shown in FIG. 1;
FIG. 3 is a plan view of a first embodiment of this in- 4 vention;
this method, a lens L is secured to a block 10 by way of an adhesive 12. The member 10 can be steel or a formed-in-place metallic or plastic block. The block is circular for ready reception in chucking equipment. One of the surfaces is formed with detents or depressions l6 and 18 and oftentimes with a center detent 20. These detents oftentimes receive steel-hardened inserts to increase the longevity of the block.
A first embodiment of a block of this invention is shown in FIGS. 3 through 7. The blank will again be indicated by the letter L. As shown in FIGS. 3 and 4, a steel block 30 is provided having a circular boss or orienting protrusion 32 along one surface thereof. Its exterior cylindrical surface is indicated by the numeral 33. The other surface of the block is formed with a dishshaped depression 34 which is circumscribed by a rim 36. As shown in FIG. 3 the rim 36, immediately below its top edge 38, is formed with an inwardly tapered edge 40.which receives the lens blank L. The tapered edge 40 provides a shoulder for the lens blank. Immediately below the shoulder 40 an annular depression 42 receives a resilient plastic or rubber gasket member 44. As will be described more fully hereinafter, the gasket 44, together with the lens blank L and the depression 34 provides a sealed vacuum chamber 46.
A fitting 48 extends outwardly from the peripheral surface 33 and leads to a vacuum source 50 via a flexible tubing 52. The block member 30 is formed with a passageway 54 leading to the vacuum source via fitting 48 and the flexible tubing 52.
The upper surface 38 of the rim 36 has indicia or alignment marks 56 and 58. These alignment marks are matched with indicia previously applied to the lens blank L. The marks'are so placed onthe lens blank by conventional means such as a marking pen or layout marker. 8
In operation, an equipment operator places the lens L as shown in FIG. 6 while orienting the alignment marks. A switch activates the vacuum source 50 which causes chamber 46 to become a sealed vacuum holder. The axial position of the lens is accurately .determined because the lens blank will engage the surface 40. The rim 36 is notched at 56 for alignment with the lens generating chucking equipment. I
A second embodiment of the invention is shownin FIGS. 7 and 8. Here the blocking member has the vacuum source fitting 74 entering the center of the depression with hardened steel inlets and 72'for drive pins. Note that the rim 38 has indicia marks for alignment with the base curve of the lens. The center positioning of fitting 74 reduces vibrations when the block is used with polishing and fining machines of the type mentioned in assignee's co-pending application, Ser. No. 169,224, filed Aug. 5, 1971, entitled POLISHER- FINER MACHINE.
In a general manner, while there has been disclosed an effective and efficient embodiments of the invention, it should be well understood that the invention is not limited to such embodiments as there might be changes made in the arrangement, disposition, and form of the parts without departing from the principle of the present invention as comprehended within the optical orientation of said blank during lens finishing processing, that improvement comprising ery secured in said groove and extending inwardly to define an opening having a diameter less than the diameter of saidupper surface, a vacuum source,
conduit system communicating said vacuum source with said cavity,
said conduit system including a bore through said chucking member,
a flexible hose communicating said bore and said vacuum source, whereby when a lens blank is placed in engagement with said gasket and said vacuum source draws a vacuum in said enclosed cavity, said lens blank seals against said gasket and is securely held to said chucking member.

Claims (1)

1. In a vacuum chucking system for securing a lens blank of a type having indicia thereon to indicate the optical orientation of said blank during lens finishing processing, that improvement comprising a chucking member having a shallow depression defined by a base portion and a peripheral rim extending upwardly about said base and said rim having inner and outer surfaces terminated by an upper annular surface said upper surface of said peripheral rim having orienting indicia thereon, an inwardly and downwardly tapered edge extending from said inner surface a short distance from said upper surface and providing a shoulder for the lens blank an annular groove formed immediately below said tapered edge, a Flat, annular, flexible gasket having its outer periphery secured in said groove and extending inwardly to define an opening having a diameter less than the diameter of said upper surface, a vacuum source, conduit system communicating said vacuum source with said cavity, said conduit system including a bore through said chucking member, a flexible hose communicating said bore and said vacuum source, whereby when a lens blank is placed in engagement with said gasket and said vacuum source draws a vacuum in said enclosed cavity, said lens blank seals against said gasket and is securely held to said chucking member.
US00217469A 1972-01-13 1972-01-13 Vacuum chuck for ophthalmic lens finishing machinery Expired - Lifetime US3794314A (en)

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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837125A (en) * 1973-09-04 1974-09-24 Celestron Pacific Method and system for making schmidt corrector lenses
US3889431A (en) * 1973-09-04 1975-06-17 Celestron Pacific Method for making schmidt corrector lenses
US3968599A (en) * 1972-12-01 1976-07-13 Harris, Beach & Wilcox Lens blocking tools
US4089102A (en) * 1975-10-23 1978-05-16 Autoflow Engineering Limited Method of forming and using a lens holder
USRE29878E (en) * 1973-09-26 1979-01-09 Celestron Pacific Method for making replica contour block masters for producing Schmidt corrector plates
US4184292A (en) * 1978-03-24 1980-01-22 Revlon, Inc. Vacuum chuck
US4267672A (en) * 1979-06-04 1981-05-19 Cole National Corporation Lens processing method
US4841965A (en) * 1984-11-13 1989-06-27 Jacobs Deborah A Animal holding and position restoring device employing vacuum holder and mouthpiece
US4895102A (en) * 1987-10-29 1990-01-23 Techna Vision Incorporated Spin coater
US5282305A (en) * 1990-02-08 1994-02-01 Ford Motor Company Method of aligning a striker plate with a latch body of a door latch mechanism
US5335453A (en) * 1991-06-06 1994-08-09 Commissariat A L'energie Atomique Polishing machine having a taut microabrasive strip and an improved wafer support head
US5520568A (en) * 1992-07-17 1996-05-28 Minnesota Mining And Manufacturing Company Method of processing a lens and means for use in the method
US5820673A (en) * 1996-11-12 1998-10-13 Sentilles; J. Bruce Apparatus for applying coatings to lenses and curing the coatings
US6126520A (en) * 1996-10-07 2000-10-03 Raytheon Company Fixture and methodology for coupling an optical component to a machine
US6463644B1 (en) * 1996-04-29 2002-10-15 The Paslin Company Tool for aligning vehicle fender on vehicle during assembly
FR2863520A1 (en) * 2003-12-10 2005-06-17 Essilor Int Pneumatic locking support for e.g. ophthalmic lens, has locking unit with joint projecting from reception side of tray, and annular flange rotating around central axis and constituted of circular ridge bordering central cavity
WO2008022978A1 (en) * 2006-08-22 2008-02-28 Essilor International (Compagnie Generale D'optique) Process for holding an optical lens on a holder of a lens machining equipment
US20110073776A1 (en) * 2009-09-30 2011-03-31 Kyocera Corporation Attraction member, and attraction device and charged particle beam apparatus using the same
US20160052097A9 (en) * 2005-08-10 2016-02-25 Schneider Gmbh & Co. Kg Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece
US9321257B2 (en) 2013-04-04 2016-04-26 Nike, Inc. Cylinder with recessed portions for holding tubular articles for printing
US9409414B2 (en) 2013-04-04 2016-08-09 Nike, Inc. Vacuum cylinder with recessed portions for holding articles for printing
US12059768B2 (en) * 2021-01-28 2024-08-13 Carl Zeiss Vision International Gmbh Blocking piece and method for vacuum blocking a lens blank

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US904679A (en) * 1907-06-04 1908-11-24 David A Bruton Chuck.
US1503390A (en) * 1922-04-01 1924-07-29 Franklin Baker Company Paring machine
US2545448A (en) * 1947-06-27 1951-03-20 Gen Optical Company Inc Apparatus for grinding lenses
FR1014564A (en) * 1947-09-03 1952-08-19 Improvement in supports or mandrels to keep optical glasses in position during their manufacture
US2688220A (en) * 1952-04-16 1954-09-07 Eastman Kodak Co Means of chucking thin edge lenses
US3015196A (en) * 1959-12-07 1962-01-02 David L Campbell Method of making spectacle lenses
US3461622A (en) * 1966-05-05 1969-08-19 Brooks B Rayford Dop stick

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US904679A (en) * 1907-06-04 1908-11-24 David A Bruton Chuck.
US1503390A (en) * 1922-04-01 1924-07-29 Franklin Baker Company Paring machine
US2545448A (en) * 1947-06-27 1951-03-20 Gen Optical Company Inc Apparatus for grinding lenses
FR1014564A (en) * 1947-09-03 1952-08-19 Improvement in supports or mandrels to keep optical glasses in position during their manufacture
US2688220A (en) * 1952-04-16 1954-09-07 Eastman Kodak Co Means of chucking thin edge lenses
US3015196A (en) * 1959-12-07 1962-01-02 David L Campbell Method of making spectacle lenses
US3461622A (en) * 1966-05-05 1969-08-19 Brooks B Rayford Dop stick

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3968599A (en) * 1972-12-01 1976-07-13 Harris, Beach & Wilcox Lens blocking tools
US3837125A (en) * 1973-09-04 1974-09-24 Celestron Pacific Method and system for making schmidt corrector lenses
US3889431A (en) * 1973-09-04 1975-06-17 Celestron Pacific Method for making schmidt corrector lenses
USRE29878E (en) * 1973-09-26 1979-01-09 Celestron Pacific Method for making replica contour block masters for producing Schmidt corrector plates
US4089102A (en) * 1975-10-23 1978-05-16 Autoflow Engineering Limited Method of forming and using a lens holder
US4184292A (en) * 1978-03-24 1980-01-22 Revlon, Inc. Vacuum chuck
US4267672A (en) * 1979-06-04 1981-05-19 Cole National Corporation Lens processing method
US4841965A (en) * 1984-11-13 1989-06-27 Jacobs Deborah A Animal holding and position restoring device employing vacuum holder and mouthpiece
US4895102A (en) * 1987-10-29 1990-01-23 Techna Vision Incorporated Spin coater
US5282305A (en) * 1990-02-08 1994-02-01 Ford Motor Company Method of aligning a striker plate with a latch body of a door latch mechanism
US5335453A (en) * 1991-06-06 1994-08-09 Commissariat A L'energie Atomique Polishing machine having a taut microabrasive strip and an improved wafer support head
US5520568A (en) * 1992-07-17 1996-05-28 Minnesota Mining And Manufacturing Company Method of processing a lens and means for use in the method
US6463644B1 (en) * 1996-04-29 2002-10-15 The Paslin Company Tool for aligning vehicle fender on vehicle during assembly
US6126520A (en) * 1996-10-07 2000-10-03 Raytheon Company Fixture and methodology for coupling an optical component to a machine
US5820673A (en) * 1996-11-12 1998-10-13 Sentilles; J. Bruce Apparatus for applying coatings to lenses and curing the coatings
FR2863520A1 (en) * 2003-12-10 2005-06-17 Essilor Int Pneumatic locking support for e.g. ophthalmic lens, has locking unit with joint projecting from reception side of tray, and annular flange rotating around central axis and constituted of circular ridge bordering central cavity
WO2005065886A1 (en) * 2003-12-10 2005-07-21 Essilor International Pneumatic blocking support for an optical lens
US20070105490A1 (en) * 2003-12-10 2007-05-10 Armand Achy Pneumatic blocking support for an optical lens
US7500908B2 (en) 2003-12-10 2009-03-10 Essilor International Pneumatic blocking support for an optical lens
US20160052097A9 (en) * 2005-08-10 2016-02-25 Schneider Gmbh & Co. Kg Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece
US9381604B2 (en) 2005-08-10 2016-07-05 Schneider Gmbh & Co. Kg Preformed block piece with three points of support
WO2008022978A1 (en) * 2006-08-22 2008-02-28 Essilor International (Compagnie Generale D'optique) Process for holding an optical lens on a holder of a lens machining equipment
US8698099B2 (en) * 2009-09-30 2014-04-15 Kyocera Corporation Attraction member, and attraction device and charged particle beam apparatus using the same
US20110073776A1 (en) * 2009-09-30 2011-03-31 Kyocera Corporation Attraction member, and attraction device and charged particle beam apparatus using the same
US9321257B2 (en) 2013-04-04 2016-04-26 Nike, Inc. Cylinder with recessed portions for holding tubular articles for printing
US9409414B2 (en) 2013-04-04 2016-08-09 Nike, Inc. Vacuum cylinder with recessed portions for holding articles for printing
US9475309B2 (en) 2013-04-04 2016-10-25 Nike, Inc. Cylinder with recessed portions for holding tubular articles for printing
US10259241B2 (en) 2013-04-04 2019-04-16 Nike, Inc. Vacuum cylinder with recessed portions for holding articles for printing
US12059768B2 (en) * 2021-01-28 2024-08-13 Carl Zeiss Vision International Gmbh Blocking piece and method for vacuum blocking a lens blank

Also Published As

Publication number Publication date
AU471835B2 (en) 1976-05-06
AU5096073A (en) 1974-07-11

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