US3466812A - Holders for gem stones - Google Patents

Holders for gem stones Download PDF

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Publication number
US3466812A
US3466812A US611055A US3466812DA US3466812A US 3466812 A US3466812 A US 3466812A US 611055 A US611055 A US 611055A US 3466812D A US3466812D A US 3466812DA US 3466812 A US3466812 A US 3466812A
Authority
US
United States
Prior art keywords
holder
pot
press
gem
polishing
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
US611055A
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English (en)
Inventor
Alec Leibowitz
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.)
Spectrum Diamonds Pty Ltd
Original Assignee
Spectrum Diamonds Pty 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 Spectrum Diamonds Pty Ltd filed Critical Spectrum Diamonds Pty Ltd
Application granted granted Critical
Publication of US3466812A publication Critical patent/US3466812A/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
    • 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

  • a holder for supporting a gem stone on a polishing wheel comprising an elongated metal body provided with a compartment at its front end for retaining a gem carrying press-pot, an outer polishing guide ring, and an insulating sleeve in the body for electrically insulating the outer ring from a press-pot held in the compartment.
  • This invention relates to a holder for supporting a gem stone during polishing.
  • a gem stone for example a diamond
  • a press-pot which in turn is gripped by a holder, with the holder being located in a dop.
  • the dop in turn is attached to an arm which is used to locate the gem over aifiolishing wheel, and such arm is referred to in the art as a tang.
  • press-pots which are made of suitable metal shaped in the form of an elongated pear.
  • a cavity is defined in which the gem stone is to be located and the pear is split axially from the blunt end to a point towards the sharp end so that a series of fingers are provided.
  • These fingers expand radially outwardly to permit the gem to be located in the pot or cavity and on radially inward movement of the fingers, the gem is gripped sufliciently tightly for polishing to be carried out on an underlying wheel.
  • Radially inward movement of the fingers is accomplished by pushing the press-pot axially into a bore in the leading end of the polishing holder.
  • the holder and the press-pot are normally inclined to the vertical and polishing takes place in a plane which will ultimately cause contact to be established between the leading tip of the press-pot and the wheel surface.
  • the invention is directed to a holder for supporting a gem stone during polishing, the holder comprising a compartment at its forward end adapted to hold a gem stone carrying pot inserted therein, an outer ring of electrically conducting material whose forward end can be used as a guide for terminating polishing when it contacts a polishing surface, and means for insulating the outer ring from a press pot inserted into the compartment.
  • the invention also provides a holder, as set out in the preceding paragraph, including means to adjust its effective length.
  • a cylindrical nut may be located on a threaded shank provided at the rear end of the holder and by screwing the nut axially outwardly the efiective length of the holder is increased.
  • the effective length is shortened.
  • the holder is a cylindrical piece of suitable metal which is bored centrally to provide a bore 1 through which a tool may be passed to eject a press-pot.
  • a press-pot compartment 2 is provided in the leading end of the holder and the bore 1 communicates with the compartment via a bore 9.
  • a threaded shank 3 of reduced diameter is located and a nut 4 is fitted onto the shank.
  • the nut and the holder body are of uniform diameter and the nut and rear portion of the body are adapted frictionally to engage in a bore in a dop. (The shank and threaded nut could alternatively be replaced by a suitable headed screw and threaded hole in the end of the holder.)
  • the effective length of the holder may be varied to adjust for dilferent projections of gem stones from the press-pot.
  • the compartment in the holder for the press-pot accommodates a metallic sleeve insert 5 for gripping the presspot and a nylon insulating sleeve 7 is located between the insert and outer walls 6 of the holder.
  • a metal ring 8 is frictionally fited over the cylindrical body of the holder and the metal ring is capable of axial movement into any desired position. It will be seen that when a press-pot is inserted into its compartment, the press-pot will be electrically insulated from the remainder of the holder by the insulating sleeve 7. However, it is possible to establish electrical connection between the pot and the holder through the bores 1 and 9.
  • press-pot employed is conventional and includes a metal pear-shaped body 10 which is adapted to be inserted in the compartment 2 with its blunt end projecting therefrom.
  • a cavity (not shown) is provided for the accommodation of portion of a gem stone and the sides of the press-pot are split axially to define a series of fingers a, b and c. These fingers expand radially to permit a gem to be fitted into the pot and contract to grip the gem. Radial contraction is etfected when the press-pot is pushed into the compartment in the holder.
  • the leading end of the press-pot tapers outwardly, and a slope or bevel is also provided on leading edge 11 of the ring 8 surrounding the holder body.
  • the press-pot When a stone is to be polished, the press-pot is opened to permit the back of the stone to be inserted in the cavity in the leading end of the press-pot. The press-pot is then pushed into the compartment 2 so that radial contraction of the fingers takes place with the stone firmly gripped therebetween. The ring is then advanced to ensure that during polishing, when the required depth of polish is obtained, the leading edge 11 of the ring contacts the polishing surface. An electrical circuit can then be completed between the polishing plate, ring and holder, and the operation terminated. If, during polishing, the pot contacts the polishing plate, no electrical circuit will be completed through the holder since the pot is insulated. However, if it is necessary to establish such a circuit (for example in carrying out a method according to U.S. patent application No. 690,916, filed Dec. 15, 1967), then electrical contact can be made with the pot through bores 1 and 9.
  • the essence of the invention is the provision of the ring or other suitable device insulated from the pot for use with a guide to terminate polishing and thereby provide a depth control in regard to polishing.
  • the ring need not be axially slidable, but could be fixed in a suitable position, or could comprise or form part of the walls 6.
  • a holder for supporting a gem stone during polishing comprising a body of electrically conducting material, wall means defining a cavity at a forward end of said body for gripping an elongate gem carrying press-pot, a ring of electrically conducting material mounted on an outer surface of said body, said ring having a circumferentially continuous front edge useful as a guide for terminating the polishing of each of a series of facets around said gem, and insulating means Within said body between said wall means and said outer surface for electrically insulating said presspot from said ring.
  • a holder as claimed in claim 1 in which said cavity has a walling of conducting material and said insulating means is a sleeve surrounding said walling inwardly of said ring.
  • a holder as claimed in claim 1 including means for adjusting the efiective length of said holder.
  • a holder as claimed in claim 1 having a longitudinal bore formed therethrough leading into said cavity.
  • a holder as claimed in claim 1 having a gem-carrying press-pot inserted into said cavity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Adornments (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Gripping On Spindles (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US611055A 1966-02-02 1967-01-23 Holders for gem stones Expired - Lifetime US3466812A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ZA66624 1966-02-02

Publications (1)

Publication Number Publication Date
US3466812A true US3466812A (en) 1969-09-16

Family

ID=25560962

Family Applications (2)

Application Number Title Priority Date Filing Date
US611055A Expired - Lifetime US3466812A (en) 1966-02-02 1967-01-23 Holders for gem stones
US611093A Expired - Lifetime US3466813A (en) 1966-02-02 1967-01-23 Holders for gem stones

Family Applications After (1)

Application Number Title Priority Date Filing Date
US611093A Expired - Lifetime US3466813A (en) 1966-02-02 1967-01-23 Holders for gem stones

Country Status (7)

Country Link
US (2) US3466812A (fr)
JP (2) JPS4823581B1 (fr)
BE (2) BE693460A (fr)
DE (2) DE1652169C3 (fr)
GB (2) GB1171212A (fr)
IL (2) IL27310A (fr)
NL (2) NL6701285A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4365447A (en) * 1980-09-25 1982-12-28 Rca Corporation Apparatus and method for sharpening a cutting stylus

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5913945A (ja) * 1982-07-15 1984-01-24 Natl Inst For Res In Inorg Mater 超高温可変雰囲気の物質構造解析装置
DK466083A (da) * 1982-10-13 1984-04-14 Teldec Schallplatten Gmbh Holder til en rilleskaerer
DE3505444A1 (de) * 1985-02-16 1986-08-21 Heinrich Dipl.-Ing.(FH) 8133 Feldafing Landgraf Edelstein-facettiermaschine
US5931068A (en) * 1998-09-09 1999-08-03 Council, Jr.; Buford W. Method for lathing a lens

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2270420A (en) * 1941-05-01 1942-01-20 Dinhofer Julius Diamond holder
US2393939A (en) * 1941-03-31 1946-01-29 Spira Josef Hillel Apparatus for polishing or forming facets on gems, diamonds, or the like
US2513139A (en) * 1942-09-14 1950-06-27 Thomas P N Burness Mechanical gripper for diamonds
US2829472A (en) * 1953-09-22 1958-04-08 Salzer Alexander Automatic diamond cutting and polishing device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2388751A (en) * 1944-05-12 1945-11-13 Levy Baruch Diamond polishing device
US2444795A (en) * 1945-09-28 1948-07-06 Leander M Weir Faceting head
US3109268A (en) * 1960-12-06 1963-11-05 Hillard A Printz Gem cutter's dop

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2393939A (en) * 1941-03-31 1946-01-29 Spira Josef Hillel Apparatus for polishing or forming facets on gems, diamonds, or the like
US2270420A (en) * 1941-05-01 1942-01-20 Dinhofer Julius Diamond holder
US2513139A (en) * 1942-09-14 1950-06-27 Thomas P N Burness Mechanical gripper for diamonds
US2829472A (en) * 1953-09-22 1958-04-08 Salzer Alexander Automatic diamond cutting and polishing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4365447A (en) * 1980-09-25 1982-12-28 Rca Corporation Apparatus and method for sharpening a cutting stylus

Also Published As

Publication number Publication date
DE1652169A1 (de) 1970-05-06
GB1171212A (en) 1969-11-19
US3466813A (en) 1969-09-16
IL27309A (en) 1970-10-30
DE1652168A1 (de) 1970-06-25
BE693461A (fr) 1967-07-03
BE693460A (fr) 1967-07-03
DE1652169B2 (de) 1973-07-05
GB1171211A (en) 1969-11-19
JPS4818184B1 (fr) 1973-06-04
NL6701285A (fr) 1967-08-03
IL27310A (en) 1970-10-30
NL151288B (nl) 1976-11-15
DE1652169C3 (de) 1974-01-24
NL6701284A (fr) 1967-08-03
JPS4823581B1 (fr) 1973-07-14

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