US3543447A - Apparatus to control gravitational movement of a gem stone polishing tang towards a stone polishing surface - Google Patents

Apparatus to control gravitational movement of a gem stone polishing tang towards a stone polishing surface Download PDF

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Publication number
US3543447A
US3543447A US691618A US3543447DA US3543447A US 3543447 A US3543447 A US 3543447A US 691618 A US691618 A US 691618A US 3543447D A US3543447D A US 3543447DA US 3543447 A US3543447 A US 3543447A
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US
United States
Prior art keywords
tang
dashpot
stone polishing
gem
tube
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
US691618A
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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 US3543447A publication Critical patent/US3543447A/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

Definitions

  • This invention relates to apparatus for controlling movements of a component adapted to move under gravity.
  • the invention consists in control apparatus for a component adapted to move under gravity comprising a liquid dashpot assembly for controlling gravitational movement of the component and an upstanding tube in liquid communication with the dashpot through a flexible tube connection which can be used to adjust the position of balance of the dashpot plunger by vertical movement of the upstanding tube.
  • FIG. 1 is a semi-diagrammatic perspective view
  • FIG. 2 is an enlarged sectional view of a component of the apparatus shown in FIG. 1.
  • the apparatus comprises a horizontally extending arm or tang 1, pivoted adjacent its rear end and carrying at its front end a gem stone chuck or dop 2 which, by pivoting movements of the tang, can be brouhgt into and out of polishing engagement with an underlying rotary polishing wheel 3.
  • the tank has, at an intermediate point in its length, a downwardly depending follower 4 resting on a plunger 5 of a mercury filled dashpot 6 below the tang for cushioning movements of the tang towards the wheel and for then controlling the polishing pressure by exerting a back pressure on the tang.
  • the dashpot reservoir is connected via a flexible rubber tube 7 to an upstanding partially mercury filled tube 8 mounted for automatically controlled vertical movements as will be described.
  • the flexible rubber tube is of suflicient length that when the upstanding tube is in its lowest position, the rubber tube forms a U extending below the level of the dashpot reservoir.
  • the plunger When the tang is off the dashpot plunger, the plunger will have a balanced rest position, depending on the position of the upstanding tube. It is necessary for cushioning movements of the tang on to the wheel that this rest position be such that when the tang is lowered, its follower engages the plunger before a gem in the chuck engages the wheel. Then, the weight of the tang on the plunger gradually depresses the plunger allowing the gem to contact the wheel until polishing is completed. If, however, the tang is light or counter-weighted, its pressure on the plunger may be insufiicient to move it sufliciently from its initial balanced position to enable the gem to come into contact with the wheel.
  • the mercury column when the tang has moved down onto the plunger, the mercury column is automatically lowered a predetermined amount. This causes the length of flexible tube below the dashpot to increase and accordingly lower the balance level of the plunger dashpot, since liquid flows out of the dashpot into the U-tube. It will be appreciated that the rate of descent of the mercury column influences the rate of descent of the plunger introducing a further measure of control for the tang movement.
  • An electric motor 9, having a control circuit operated by movements of the tang may be employed for automatically raising and lowering the mercury tube through a pulley and belt system .11.
  • valve means may be included in the tube leading from the dashpot reservoir to enable liquid to flow more speedily into than out of the reservoir.
  • a valve 12 may comprise a body 13 with first outlet means 14 at its reservoir end, second outlet means 15 at its mercury column end, and a movable valve member 16, such as a ball, adapted when liquid is flowing from the reservoir to be urged towards the second outlet means and limit flow therethrough, and when liquid is flowing into the reservoir to be urged towards the first outlet means but allowing a great flow therethrough.
  • a movable valve member 16 such as a ball
  • a gem stone polishing apparatus including a stone polishing surface, a stone carrying tang mounted for movement under gravity towards the polishing surface, and control means for the tang, said control means comprising a liquid-dashpot assembly for cushioning the tang during movement towards the polishing surface, an upstanding tube and a flexible tube connection providing liquid communication between the dashpot and the upstanding tube for adjusting the position of balance of the dashpot plunger by vertical movement of the upstanding tube.
  • Control apparatus to control gravitational movement of a gem stone polishing tang towards a stone polishing surface, comprising a liquid dashpot assembly for cushioning the tang during movement towards the polishing surface, an upstanding tube, a flexible tube connection providing liquid communication between the dashpot and the upstanding tube for adjusting the position of balance of the dashpot plunger by vertical movement of the upstanding tube, and automatic means for lifting the upstanding tube when the tang is lifted away from the dashpot and for lowering the upstanding tube after the tang has been lowered onto the dashpot.
  • valve means to permit liquid to flow more rapidly into the dashpot than out of the dashpot.
  • valve means comprises a valve body, a first outlet leading to the dashpot, a second outlet leading into said upstanding tube and a floating member adapted to assume a position partially blocking the second outlet when liquid flows out of the dashpot and to move away from said position when liquid flows into the dashpot.

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  • 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)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US691618A 1966-12-20 1967-12-18 Apparatus to control gravitational movement of a gem stone polishing tang towards a stone polishing surface Expired - Lifetime US3543447A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB56977/66A GB1209147A (en) 1966-12-20 1966-12-20 Improvements in dashpot control apparatus

Publications (1)

Publication Number Publication Date
US3543447A true US3543447A (en) 1970-12-01

Family

ID=10478027

Family Applications (1)

Application Number Title Priority Date Filing Date
US691618A Expired - Lifetime US3543447A (en) 1966-12-20 1967-12-18 Apparatus to control gravitational movement of a gem stone polishing tang towards a stone polishing surface

Country Status (8)

Country Link
US (1) US3543447A (fr)
BE (1) BE708307A (fr)
DE (1) DE1652185B1 (fr)
ES (1) ES349078A1 (fr)
FR (1) FR1548979A (fr)
GB (1) GB1209147A (fr)
IL (1) IL29139A (fr)
NL (1) NL148524B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902275A (en) * 1972-12-18 1975-09-02 American Optical Corp Knife sharpener
US3973361A (en) * 1975-07-11 1976-08-10 Sanyo Electric Co., Ltd. Stylus grinding device for video disc player
FR2309947A1 (fr) * 1975-04-30 1976-11-26 Ted Bildplatten Procede et appareil de retouche repetee d'un corps destine au guidage d'un organe de lecture ou de gravure
US20040187442A1 (en) * 2003-03-27 2004-09-30 Swf Companies, Inc. High-speed continuous action form-fill-seal apparatus
CN111843700A (zh) * 2020-06-30 2020-10-30 宁波博莱特光电科技股份有限公司 一种陶瓷插芯自动化生产装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE520607A (fr) *
US2446901A (en) * 1945-08-31 1948-08-10 Western Electric Co Article feeding apparatus
FR1084675A (fr) * 1953-06-09 1955-01-21 Perfectionnement apportés à l'installation des amortisseurs hydrauliques télescopiques

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2395952A (en) * 1945-03-03 1946-03-05 Bartnovsky Leopold Diamond holder or dop for holding diamonds
DE812159C (de) * 1948-10-02 1951-08-27 Karl Hermann Jaeger Einspannfutter fuer zu schleifende Diamanten
CH279422A (de) * 1950-04-03 1951-11-30 Surbeck Eduard Ventil.
DE950251C (de) * 1954-02-06 1956-10-04 Otto Doelling Schwimmkugelventil zum Unterbrechen des Soges an Vakuumleitungen von Melkmaschinenanlagen
US2932316A (en) * 1957-07-01 1960-04-12 Austin N Stanton Valves
DE1261421B (de) * 1963-04-22 1968-02-15 Dampex Corp Proprietary Ltd Einrichtung zum Anzeigen und Begrenzen der Schleiftiefe und des Abtrages an einer Edelsteinschleifmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE520607A (fr) *
US2446901A (en) * 1945-08-31 1948-08-10 Western Electric Co Article feeding apparatus
FR1084675A (fr) * 1953-06-09 1955-01-21 Perfectionnement apportés à l'installation des amortisseurs hydrauliques télescopiques

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902275A (en) * 1972-12-18 1975-09-02 American Optical Corp Knife sharpener
FR2309947A1 (fr) * 1975-04-30 1976-11-26 Ted Bildplatten Procede et appareil de retouche repetee d'un corps destine au guidage d'un organe de lecture ou de gravure
US3973361A (en) * 1975-07-11 1976-08-10 Sanyo Electric Co., Ltd. Stylus grinding device for video disc player
US20040187442A1 (en) * 2003-03-27 2004-09-30 Swf Companies, Inc. High-speed continuous action form-fill-seal apparatus
CN111843700A (zh) * 2020-06-30 2020-10-30 宁波博莱特光电科技股份有限公司 一种陶瓷插芯自动化生产装置

Also Published As

Publication number Publication date
IL29139A (en) 1971-02-25
NL6717194A (fr) 1968-06-21
BE708307A (fr) 1968-05-02
ES349078A1 (es) 1969-04-01
NL148524B (nl) 1976-02-16
FR1548979A (fr) 1968-12-06
DE1652185B1 (de) 1972-05-31
GB1209147A (en) 1970-10-21

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