US2809479A - Apparatus for grinding the bottom surface of a ribbon of glass - Google Patents

Apparatus for grinding the bottom surface of a ribbon of glass Download PDF

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Publication number
US2809479A
US2809479A US505727A US50572755A US2809479A US 2809479 A US2809479 A US 2809479A US 505727 A US505727 A US 505727A US 50572755 A US50572755 A US 50572755A US 2809479 A US2809479 A US 2809479A
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US
United States
Prior art keywords
glass
ribbon
grinding
disc
central cavity
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
US505727A
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English (en)
Inventor
Lamesch Armand
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.)
Compagnie de Saint Gobain SA
Original Assignee
Compagnie de Saint Gobain SA
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 Compagnie de Saint Gobain SA filed Critical Compagnie de Saint Gobain SA
Application granted granted Critical
Publication of US2809479A publication Critical patent/US2809479A/en
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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
    • B24B57/00—Devices for feeding, applying, grading or recovering grinding, polishing or lapping agents
    • 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
    • B24B7/00—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor
    • B24B7/20—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground
    • B24B7/22—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain
    • B24B7/24—Machines or devices designed for grinding plane surfaces on work, including polishing plane glass surfaces; Accessories therefor characterised by a special design with respect to properties of the material of non-metallic articles to be ground for grinding inorganic material, e.g. stone, ceramics, porcelain for grinding or polishing glass

Definitions

  • the present invention relates to apparatus for simultaneously grinding both surfaces of a ribbon of glass.
  • a well known form of apparatus for simultaneously grinding the two surfaces of a ribbon of glass comprises coaxial tools each including circular grinding discs mounted to rotate around vertical axes and arranged in coaxial pairs one towards each face of the ribbon, the pairs being arranged longitudinally along the path of movement of the ribbon and the ribbon of glass being continually advanced between pairs of opposed discs which engage and grind the two surfaces of the ribbon.
  • coaxial tools each including circular grinding discs mounted to rotate around vertical axes and arranged in coaxial pairs one towards each face of the ribbon, the pairs being arranged longitudinally along the path of movement of the ribbon and the ribbon of glass being continually advanced between pairs of opposed discs which engage and grind the two surfaces of the ribbon.
  • the present invention concerns the lower tools, i. e. those including grinding discs operating against the lower surface of the ribbon of glass.
  • the grinding surface of these grinder discs comprises an annulus of nogs separated like islands by intersecting channels, the annulus surrounding a central cavity of the tool which cavity is somewhat in the form of a basin.
  • a liquid suspension of abrasive is fed to this basin through the coaxial hollow shaft which drives the disc. From the basin the abrasive suspension passes into the channels which separate the nogs opening into the central cavity, and due to the hydrostatic head and centrifugal forces developed swirls up into the channels and finally engages between the faces of the nogs and the ribbon of glass.
  • the main object of the present invention is to devise a means of feeding the abrasive fluid to the lower grinding discs in apparatus of the kind referred to and to devise means of preventing cullet accumulation in the central cavity of the disc whereby the aforesaid disadvantages are avoided and furthermore to create other advantages which will appear from the following description.
  • the present invention consists in conducting the suspension of abrasive from the hollow driving shaft of a bottom grinding disc through conduits into the inner end channels in the disc which separate the nogs, in contradistinction to present practice in which the suspension is supplied to the channels from the central cavity itself, the wall of the central cavity being formed with apertures through which cullet may escape during operation of the machine.
  • conduits which I thus feed the suspension of abrasive to the channels may open into a trough formed near the wall of the central Patented Oct. 15, 1957 cavity, the trough being formed to direct the suspension received from the conduits towards the channels opening into the central cavity.
  • the apertures formed in the wall of the central cavity in accordance with the present invention provide the further advantage of putting the latter into communication with the atmosphere and of thus eliminating the creation of a vacuum which would tend to be created under the ribbon of glass with the usual tools with an airtight central cavity, at the moment of starting up, which vacuum is represented by a suction likely to cause such a deflection of the glass into the cavity as to lead to breakage of the ribbon of glass.
  • Fig. 1 is a vertical central section of a lower tool of a coaxial pair intended to operate simultaneously on a ribbon of glass advanced between them.
  • the upper tool is not shown as it forms no part of the present invention, and
  • Pig. 2 is a fragmentary plan showing the conduits for the liquid abrasive, leading from the hollow driving shaft of the disc to a trough, and from the trough into the inner ends of the channels in the grinder surface.
  • the ribbon of glass 1 to be ground is shown resting on the lower tool which comprises a grinder disc 2 and a backing plate 3 assembled in known manner at the periphery of a plate 4, which forms the floor of the central cavity of the disc, the plate, in accordance with the invention, comprising openings 5 distributed regularly about the axis of the tool to permit evacuation of used abrasive liquid and fragments of glass.
  • the plate 4 is fixed in usual manner by bolts on to a collar 6 which is firmly fastened to a coaxial hollow driving shaft 7 which imparts the desired rotary movement of the tool.
  • a junction box 8 is superimposed on the driving shaft '7 and is connected in a water-tight manner on the driving shaft 7 to connect the interior of the box with the bore 9 of the driving shaft, as an extension thereof, by which bore the liquid abrasive is fed directly into the box 3.
  • From the box 8 emanate a group of radial tubes 10 through which the abrasive liquid reaching the box 8 is thrown towards the grinder disc by centrifugal force.
  • the liquid pours from the tubes 10 into a circular trough 11 adjacent the wall of the central cavity, whence it moves on into the inner ends of the channels separating the nogs and which merge into the central cavity.
  • the trough 11 is formed from sheet metal, the lower part of which is, for example, clamped in a water-tight manner between plate 4 and backing plate 3 and the upper part of the trough is shaped so that its edge 12 is in proximity with the internal wall of the disc at about the height of the base of the channels.
  • the form of the troughs is such that very little if any fragments of glass can get into them.
  • the invention also comprises the provision of an annular collecting tank 13 located under the tool.
  • the tank may be secured to the usual framework 14 at the sides of the apparatus and on the floor 15 of the factory, the tank being disposed to receive any fragments of glass and liquid escaping through the apertures of the plate, as it does in practice. 7
  • trough 11 may be. constituted by awallemanating from the backingplate 4.as anintegralpartthereofhand its form modifiedwithout departing fromztlieinvention defined in the appendedclaims. a
  • Alower grinding discs for 118133111 anapparatus for simultaneously grinding both surfaces of a ribbon of glass asit is advanced inva horizontal plane from the lehr, comprising anrannular grinding surface defining a central cavity member including a floor fixed to a hollow driving shaft for the disc, saidgrinding, surface being intersected by distributing,channelsrextending from the central cavity outwardly of the disc, ,bytwhich channels abrasive fluid fed through the bore of the, hollow diivingshaft reaches the grinding, surface of the disc, and. a group.
  • Alower grinding disc according to claim 2 comprising a boxtmounted coaxially on the hollow driving shaft, the. group ofco'nduitsiemanating from, the box and the interior of, the box cornmunicating with the bore ofthe driving shaft as an extension, thereof.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
US505727A 1954-05-22 1955-05-03 Apparatus for grinding the bottom surface of a ribbon of glass Expired - Lifetime US2809479A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR769938X 1954-05-22
FR2809479X 1954-05-22

Publications (1)

Publication Number Publication Date
US2809479A true US2809479A (en) 1957-10-15

Family

ID=26219792

Family Applications (1)

Application Number Title Priority Date Filing Date
US505727A Expired - Lifetime US2809479A (en) 1954-05-22 1955-05-03 Apparatus for grinding the bottom surface of a ribbon of glass

Country Status (2)

Country Link
US (1) US2809479A (enrdf_load_stackoverflow)
BE (1) BE538303A (enrdf_load_stackoverflow)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646655A (en) * 1951-05-19 1953-07-28 Glaceries Sambre Sa Feeding of abrasives to glass surfacing tools
US2673428A (en) * 1951-06-06 1954-03-30 Pilkington Brothers Ltd Apparatus for grinding flat glass on both faces simultaneously
GB729683A (en) * 1952-03-20 1955-05-11 Glaceries Sambre Sa Improvements in or relating to the feeding of abrasive composition to grinding tools

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646655A (en) * 1951-05-19 1953-07-28 Glaceries Sambre Sa Feeding of abrasives to glass surfacing tools
US2673428A (en) * 1951-06-06 1954-03-30 Pilkington Brothers Ltd Apparatus for grinding flat glass on both faces simultaneously
GB729683A (en) * 1952-03-20 1955-05-11 Glaceries Sambre Sa Improvements in or relating to the feeding of abrasive composition to grinding tools

Also Published As

Publication number Publication date
BE538303A (enrdf_load_stackoverflow)

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