US2449423A - Bezel dop and grinding device - Google Patents

Bezel dop and grinding device Download PDF

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Publication number
US2449423A
US2449423A US500775A US50077543A US2449423A US 2449423 A US2449423 A US 2449423A US 500775 A US500775 A US 500775A US 50077543 A US50077543 A US 50077543A US 2449423 A US2449423 A US 2449423A
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US
United States
Prior art keywords
stock
dop
girdle
contact
gem
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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
US500775A
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English (en)
Inventor
Spira Josef Hillel
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Individual
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Individual
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Priority to US500775A priority Critical patent/US2449423A/en
Application granted granted Critical
Publication of US2449423A publication Critical patent/US2449423A/en
Priority to BE618101A priority patent/BE618101Q/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B24B9/00—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor
    • B24B9/02—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground
    • B24B9/06—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain
    • B24B9/16—Machines or devices designed for grinding edges or bevels on work or for removing burrs; Accessories therefor characterised by a special design with respect to properties of materials specific to articles to be ground of non-metallic inorganic material, e.g. stone, ceramics, porcelain of diamonds; of jewels or the like; Diamond grinders' dops; Dop holders or tongs
    • B24B9/161—Dops, dop holders

Definitions

  • This invention relates to the field of grinding or cutting facets upon gems, and more particularly to a dop for the formation of the crown or bezel facets, and to a method of forming the crown'or bezel facets.
  • the process involves forming a bruted stock with a generally cylindrical portion axially disposed to the table forming portion of the gem, then forming the pavilion or base facets about an axial line perpendicular to the table of said stock, thereby providing an axial line of reference determined by the pavilion or base facets and the table, whereby the bezel or crown facets may then be accurately and symmetrically formed thereon.
  • my present invention is directed to animprovement of my prior invention, and has for its object the provision of a holder or dop for the formation of the crown or bezel facets, whereby the grinding of small gems is made possible more economically than heretofore attain able, with accuracy inthe formation of the crown or bezel facets, and with substantially the same accuracy in the shape and number of the facets, to secure the highest degree of brilliancy in the gem,in a manner heretofore deemed uneconomical in respect of the so-called small gems, and with unusual accuracy in the formation of the larger gems, so that the employment of unusually skilled labor is avoided.
  • Still further objects of my invention reside'in the provision of electrically controlled means for automatically signalling; the completion, of 1 a facet-forming operation, whereby polishing operations may be economically practiced.
  • Figure 1 is a longitudinal sectional view ofa workholder or dop for the formation of the crown or bezel facets, and a fraginentary portion of its mounting assembly;
  • i i 1 Figure 2 is a side elevation taken in the direction of lines- 2-2 of Figure 1;
  • p a i Figure 3 is'an end elevation taken in thedirection of lines 3-3 of Figure 1;
  • Figure 3A is a longitudinal sectional viewof Figure 1', magnifiedto show the nose portion and connection to the wiring system;
  • Figure 4 is an enlarged perspective viewof a detail showing the contacting element in' posi-. tion; i
  • Figure 5 is an enlarged perspective pavilion' engaging cone.
  • I will refer to the distance d set off by theend I91 and the gauge face 2I2 as the differential bi-apothem, which may be defined as the distance measured in the upper base of a frustum of a regular pyramid extending normally and diametrically from one side of the regular polygon there defined to the point of intersection of a plane parallel to the axis and tangential to a circle circumsc-ri'bing the regular polygon in the lower base.
  • I will now refer to the views wherein I provide a gauge holder 200 comprising a generally rectangular plate, one end of which is provided with fingers 20 I--29 I, inwardly turned to seat in orifices 203-203 formed in the sleeve I50.
  • a spring clip 204 is anchored by a screw 205 at one end.
  • the free end 206 resiliently presses down upon the holder 200, thereby permitting pivotal movement of the gauge holder I200.
  • the free end of the gauge holder 200 is provided with a bolt 201, having a riveted head 208, which clamps the L-shaped leaf 209 to the holder 200.
  • the L-shaped leaf 209 has a branch 2I0 which projects through an orifice 2
  • 0 terminates into a rectangularly shaped bearing end or gauge face I95, which is arranged to be urged by the spring clip 204 to contact the perimeter of the girdle of the stock D.
  • gauge face 2I2 will be referred to as the girdle contact and the pin end I91 will be referred to as the control contact I91.
  • the bolt 201 previously described is fixed to th plate 200 by the nut 2I3, and along the shank 2", the bolt is formed with a longitudinal slot 2I5.
  • an L-shaped fine spring steel wire 2I6, of which the shorter branch 2I1 is disposed in the slot 2I5 by first mounting a coil spring 2I8 on the shank 2I4 of the bolt, thereupon positioning a washer 2I9 and gripping the branch 2 I 1 in position by the nut 220.
  • the longer branch 22I extends against the face of the plate I14, which is formed with a groove 222 deeper than the wire to center the free end and provide the control contact I91 previously mentioned.
  • the branch 22I is held in the groove 222 by the branch M0, to slide freely within the groove, notwithstanding any pressure which the face I14 may exert upon the table I92 of the stock diamond D, 1 a j It will thus be seen that a variable dimension may be secured between the free end 2I2 of the leafs 209 and the contro1 contact I91 which may be extended to bear. upon the table I93 of the stock D when guided in the groove 222.
  • the contact I91 projects beyond the apex I12 of the plate I08 and therefore leads in its contact to the turn table or skeif 223.
  • the turn table or skeif .223 is usually made of cast iron upon whose face diamond dust is provided for the polishing or facetting operation. as will be understood by the worker in the art.
  • the shaft 224 thereof carries a commutator 225, making contact with the conductor 226 leading to a make and break device 221, which actuates a signalling or like device 228, then leading through the conductor 220 connected to the set screw 205 on the sleeve I50. It will be apparent that the circuit will be completed or made when the control contact I91 comes in contact, or reaches a predetermined closed circuit making position with the skelf 223.
  • the bruted stock D with the pavilion facets I already formed thereon is positioned upon the adapter'IGD to have the pavilion facets in contact with the facets of the flared seat I 93, formed in the adapter I60, exposing the table I93 and the cylindrical section G.
  • the plate I68 with the branch 22I fitted within the groove 222 is then availed of to seat the stock D in position, care being taken to nest the facets I90 and those on the flared seat I53 into contacting engage ment, and to press the surface I14 against the table forming portion I92. 1
  • the branch 22I should be free to move in the groove 222.
  • the branch 2 I 0 is then brought into contact with the bruted girdle or cylindrical perimeter I9I.
  • the thickness of the branch 200 is calculated to exceed the height or altitude of the cylindrical perimeter I9I and the layers forming the branch 2I0 may be laminated or built up, or diminished, in accordance with the height of this cylindrical perimeter.
  • the control contact I91 With the stock D so positioned, by manipulation of the nut 220, the control contact I91 is brought into the position which it is desired to have, outlined on the table forming face I92 by the regular polygonal outline P.
  • the dop is thereupon mounted on the block 56 and the angularity'of the dop is adjusted in respect of the turn table or skeif 223, to form the facet I94.
  • This angular position is one which will assure a. remnant of the circular perimeter I 9
  • the assembly gravitates or moves under pressure with the diamond in contact with the surface of the turn table or skeif 223. This operation stipulate-- sively 'bringsthe control contact I91 into closer position .in respect of theskeiflto complete the signal circuit when the proper depth of out has been reached.
  • j 1 j I j I The assembly is then convenientlyraised, and then the hand wheel I83 may be indexed preparatory to cutting the-next facet; The same operation is then repeated in accordance with the number of facets outlined .by. the regular polygonantenna 7 P, without any iother adjustment f '.:thec:conti:'ol contact.
  • this :arrangement provides :means :to :predeterminedl-y measure off the distanced'on the'diiierential bi-apothem, which :is also the major fdiametric chord intersector in reference to the 'chordal positionof the facet edge terminating inthe table I93.
  • Eccentricity due to :this type :of wear is compensated for by the controlas determined by the differential bi-apothem measurement.
  • a dopfor facetingthebezelof diamond stock having a pavilion :segment, a table and fa generally cylindrical segment 'p10Vidl1'lg ea :girdle, a mechanical dop having opposed seats for cengaging [said 1 pavilion and table including :a body portion in which oneaof :said seats is .ijourn'alled for indexing-anelectrical signalling system therefor, the combination of means to gauge the depth of .thefacet tolbeformed including aicontact arranged to lie on 'th'e' girdle ofthe diamonda carrier for said contact 'mounted on said body, including :means on the body for: resiliently maintaining the contact in engagement with-"said girdle, a Ffa'cet sedge limiting control fcontact coupled to said.
  • a guide on the holder In a diamondholderordon-a seat" against whieha diamond is held, a guide on the holder, a feed member adjustable along said guide, a contactfinger atone end of thefeed member and projecting" from saidguide, and adapted'to have its .end located ina predeterminedposition .relative to a diamond held against the seat, springmeans .engagingsaid feed'member and acting to urge the finger toward the diamond, and at least one adjusting member on the .feed member Ito determine the extent towhich theifinger. is urged by :the spring meanstoward the diamond, to indicate a point to which the diamondshall be ground.
  • bers including a portion to contact the girdle forming portion and extending tea-point indieating the extent of the differential bi-apothem whereby said point may serve to indicate the depth of cut of the facet.
  • a diamond or the like polishing device including a den for holding a bruted diamond stock defined by a generally cylindrical segment terminating in a table and a pavilion, said dop comprising the combination of a body portion, an axial member journ-alled therein, a seat on said member for engaging the pavilion of said diamond, an extension from said body including a plate for engaging the table of said diamond, means for supporting said dop to direct the girdle forming portion to the polishing surface, an element carried by a portion of the body contacting the girdle forming portion and having another portion extending diametrically across said gem to be polished to expose a contact portion spaced from the girdle contacting part and to contact the stock to outline the differential biapothem, and to indicate on the stock the terminal edge of a facet, signalling means, an electrical circuit for actuating said signalling means, said contact being connected in said circuit so that predetermined contact of the element wit-h the polishing wheel against which the diamond is held will actuate the signalling means
  • a diamond or like gem facet polishing device including the combination with the dop for forming the facets by holding the gem to expose the girdle portion adjacent a polishing surface of a lap and to form the facets adjacent the girdle
  • means to rotate-the gem to index it for the facets to be formed including means to mount the dop and the polishing surface with respect to each other, of a gauge having a portion for contacting the girdle of the stock, and means for mounting said gauge to yieldingly urge said portion into contact with the girdle during indexing of the gem, and another portion of the gauge to contact the stock to outline the differential bi-apothem to indicate on the stock the terminal edge of a facet and the distance to feed the stock and polishing surface with respect to each other.
  • a diamond or like gem facet polishing device including the combination with the dop for forming the facets by holding the gem to expose the girdle portion adjacent a polishing surface of a lap and to form the facets adjacent the girdle comprising means to rotate the gem to index it for the facets to be formed. including means to mount the dop and the polishing surface with respect to each other.
  • a gauge having a portion for contacting the girdle of the stock, and means for mounting said gauge to yield ngly urge said portion into contact with the girdle during indexing of the gem, and another portion of the gauge to contact the stock to outline the diff-erential bi-apothem to indicate on the stock the terminal edge of a facet and the distance to feed the stock and polishing surface with respect to each other, and signalling means to indicate when the gauged distance has been so fed.
  • a dop for a bruted gem stock having a pavilion segment, a bezel forming segment and a girdle formed thereon, said dop including means for holding the gem stock upon a seat including indexing mean for rotatively applying said gem stock upon a polishing lap surface, the combination of means to gauge the stock to indicate on the stock the terminal edge of a facet in the indexing positions of the stock, said gauging means including a portion contacting the girdle of the stock and including another portion ex tending diametrically across the gem stock and toward the facet to be formed, to have an end of the latter named portion indicate on the stock the terminal edge of the facet, a signalling device, an electrical circuit for actuating said signalling device, said portion extending diametrically across said stock being connected in said circuit of said device so that contact of the said end with the polishing lap against which the gem is held will actuate the signalling means.
  • stock holdin means comprising opposed seats on said dop, each having means for engaging the table and pavilion and including means for journalling said holding means for rota'tably mounting the stock, means for indexing said stock in accordance with the number of facets desired, the combination of gauging means having oppositely spaced por 'tions, one portion of which has a contacting area which ride on the said cylindrical segment, the other portion of which extends diarnetricalll across the stock to outline on the stock the limits of the side of a facet coincident with the differential bi-apothem which is positioned to contact grinding lap when a facet is completed, signalling means, and a connection between said signalling means and gauging means for indicating said contact.
  • a diamond holder or dop for facetlng gems including means for holding the gem against a polishing surface and axially adjustable on said dop for indexing, and with the girdle exposed to facet the gem circumferentially adjacent the girdle and to one side thereof
  • the combination comprising a gauge having a portion for contacting the girdle of the gem stock and means for mounting said gauge, yieldingly to urge said portion into contact with the girdle of the gem during the indexing of the dop and another portion of the auge to contact the stock to outline on the stock the terminal edge .of a facet and the distance to feed the stock and polishing surface with respect to each other, and signalling means to indicate when the gauged distance has been so fed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Adornments (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US500775A 1943-09-01 1943-09-01 Bezel dop and grinding device Expired - Lifetime US2449423A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US500775A US2449423A (en) 1943-09-01 1943-09-01 Bezel dop and grinding device
BE618101A BE618101Q (fr) 1943-09-01 1962-05-25 Dop pour biseau et dispositif de polissage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US500775A US2449423A (en) 1943-09-01 1943-09-01 Bezel dop and grinding device

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US2449423A true US2449423A (en) 1948-09-14

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BE (1) BE618101Q (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542704A (en) * 1947-09-25 1951-02-20 Gregor H Rakowitzky Gem holder for grinding machines
US3279127A (en) * 1961-12-13 1966-10-18 Charles L Giezentanner Cabochon polishing apparatus
US3520088A (en) * 1966-12-20 1970-07-14 Spectrum Diamonds Pty Ltd Gem stone polishing machine
US3534510A (en) * 1966-12-20 1970-10-20 Spectrum Diamonds Pty Ltd Method of faceting gem stones
US4286414A (en) * 1980-02-04 1981-09-01 Rca Corporation Work holder
US4365447A (en) * 1980-09-25 1982-12-28 Rca Corporation Apparatus and method for sharpening a cutting stylus
US4561215A (en) * 1984-03-26 1985-12-31 Rca Corporation Stylus lapping control

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE96877C (fr) *
US615083A (en) * 1898-11-29 James w
US709229A (en) * 1902-04-26 1902-09-16 Eugene Mahy Diamond-cutting tool.
US740902A (en) * 1903-01-26 1903-10-06 Henry W Oostendorp Holder for cutting precious stones.
US750449A (en) * 1904-01-26 Depth-scale
US802368A (en) * 1898-12-06 1905-10-24 Clyde Coleman Grinding or polishing gems.
US1033749A (en) * 1911-10-06 1912-07-23 Eli Charles Strong Diamond-holder.
US1166843A (en) * 1914-07-13 1916-01-04 New Diamond Polishing Tool Company Of America Inc Apparatus for grinding precious stones.
US1168858A (en) * 1912-11-25 1916-01-18 Stern Coleman Diamond Machine Company Inc Gem-polishing.
US1173173A (en) * 1912-11-25 1916-02-29 Stern Coleman Diamond Machine Company Inc Gem-polishing machine.
US1191746A (en) * 1914-04-25 1916-07-18 Paul F Thomson Diamond-holder.
US1305038A (en) * 1919-05-27 Precious stohe
US2276789A (en) * 1938-02-03 1942-03-17 Nagy Arpad Apparatus for grinding diamonds and the like
US2320376A (en) * 1941-08-23 1943-06-01 Harry Winston Inc Diamond cutting and polishing machine

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1305038A (en) * 1919-05-27 Precious stohe
US615083A (en) * 1898-11-29 James w
US750449A (en) * 1904-01-26 Depth-scale
DE96877C (fr) *
US802368A (en) * 1898-12-06 1905-10-24 Clyde Coleman Grinding or polishing gems.
US709229A (en) * 1902-04-26 1902-09-16 Eugene Mahy Diamond-cutting tool.
US740902A (en) * 1903-01-26 1903-10-06 Henry W Oostendorp Holder for cutting precious stones.
US1033749A (en) * 1911-10-06 1912-07-23 Eli Charles Strong Diamond-holder.
US1168858A (en) * 1912-11-25 1916-01-18 Stern Coleman Diamond Machine Company Inc Gem-polishing.
US1173173A (en) * 1912-11-25 1916-02-29 Stern Coleman Diamond Machine Company Inc Gem-polishing machine.
US1191746A (en) * 1914-04-25 1916-07-18 Paul F Thomson Diamond-holder.
US1166843A (en) * 1914-07-13 1916-01-04 New Diamond Polishing Tool Company Of America Inc Apparatus for grinding precious stones.
US2276789A (en) * 1938-02-03 1942-03-17 Nagy Arpad Apparatus for grinding diamonds and the like
US2320376A (en) * 1941-08-23 1943-06-01 Harry Winston Inc Diamond cutting and polishing machine

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2542704A (en) * 1947-09-25 1951-02-20 Gregor H Rakowitzky Gem holder for grinding machines
US3279127A (en) * 1961-12-13 1966-10-18 Charles L Giezentanner Cabochon polishing apparatus
US3520088A (en) * 1966-12-20 1970-07-14 Spectrum Diamonds Pty Ltd Gem stone polishing machine
US3534510A (en) * 1966-12-20 1970-10-20 Spectrum Diamonds Pty Ltd Method of faceting gem stones
US4286414A (en) * 1980-02-04 1981-09-01 Rca Corporation Work holder
US4365447A (en) * 1980-09-25 1982-12-28 Rca Corporation Apparatus and method for sharpening a cutting stylus
US4561215A (en) * 1984-03-26 1985-12-31 Rca Corporation Stylus lapping control

Also Published As

Publication number Publication date
BE618101Q (fr) 1962-09-17

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