US2508276A - Method and apparatus for polishing glass - Google Patents

Method and apparatus for polishing glass Download PDF

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Publication number
US2508276A
US2508276A US18636A US1863648A US2508276A US 2508276 A US2508276 A US 2508276A US 18636 A US18636 A US 18636A US 1863648 A US1863648 A US 1863648A US 2508276 A US2508276 A US 2508276A
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US
United States
Prior art keywords
glass
polishing
ribbon
tools
tool
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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US18636A
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English (en)
Inventor
Lecron Albert
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.)
Pilkington Group Ltd
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Pilkington Brothers Ltd
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Publication date
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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
    • 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
    • B24B7/26—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 for simultaneously grinding or polishing opposite faces of continuously travelling sheets or bands
    • 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

  • This invention relates to the polishing of glass, in which the glass, in the form of a continuous ribbon, is moved horizontally between polishing tools set in pairs, one tool of each pair being adapted to operate on one surface of the glass and the second tool of said pair being adapted to operate, simultaneously with said first tool, on the opposite surface of the glass.
  • polishing of .glass is generally done by tools faced with felt which is fed with the polishing agent, and is moved rapidly across the surface of the glass under a certain pressure.
  • the tools working one surface or the other consist of discs called pads which can rotate on vertical spindles attached to arms of the framework, itself rotating about a principal vertical axis.
  • the pads themselves on their spindles acquire a rotating motion.
  • the effect of this double rotary movement i that the paths of the various points on the felt pads intersect in all directions, which tends to produce a high standard of polish.
  • Polishing tools of this type are grouped in pairs, the tools in one pair being arranged opposite to each other on the same main axis. They rub, one on each side of the glass, the pressure being exercised by the upper tool only, whilst the lower one supports the glass and resists the pressure.
  • the most simple method is to work the tools forming a pair, each from a separate motor. Under this arrangement, as a general rule, the pads of one polishing tool of a pair are only momentarly opposite the pads of the other.
  • the present invention overcomes this difliculty whilst allowing the correct pressure to be applied without risk of breakage, and, as a. result, produces a satisfactory polish using fewer tools.
  • the method comprised in this invention consists of making a pair of polishing tools, to work one on each surface of the glass, but constructed differently from each other, the one made in the ordinary way, of several small units, the other consisting of a single large unit.
  • the pressure should be applied by the tool made of several small elements, which must therefore be mobile upon its axis, whilst the function of the tool made in a large single unit is to resist the pressure and to see that the ribbon of glass is maintained at a certain level which can be regulated.
  • the large-sized tool is big enough to allow the working area of the small-sized polishers, projected upon the plane of the glass, always to lie well within the working area of the large tool, projected on the same plane.
  • the large-size polishing tool is circular, with a diameter at least equal to the width of the ribbon of glass.
  • Fig. 1 is an elevation of one section of the polishing apparatus according to the invention, showing two adjacent pairs of polishing heads.
  • Fig. 2 is a plan of the same section of the apparatus.
  • Fig. 3 is a plan of the large-size polishing head.
  • Fig. 4 is a cross-section on the line AB inFig. 3.
  • the ribbon l of glass to be polished is moved in the direction of the arrow between the polishing heads by means not shown.
  • the pair of tools shown on the left in Figs. 1 and 2 consists of a lower tool 2, circular in shape, and slightly larger in diameter than the width of the ribbon of glass; and an upper tool composed of several discs 3, t and 5 of smaller diameter and turning on vertical axes 6, l and 8 attached to the frame 9.
  • the lower and upper tools are, respectively, the large, single unit and the one with smaller polishing surfaces.
  • each pair of tools can be rotated in the direction opposite to that of the following pair of the same type.
  • the next pair of polishing tools is identical with the preceding one, but in an inverted position, i. e. the large single tool is placed above the glass, whilst the smaller one works upon the under-surface of the glass. In this case it is the upper tool which resists the pressure of the lower, and controls the level of the glass.
  • the shape is circular. It consists of a plate I integral with the rotating shaft It. To this plate is attached a felt IS with a circular hollow I! in the centre, with a diameter at least equal to that of the circle not covered by the polishing surfaces 3, 4 and 5.
  • the felt is grooved with small channels l2, l3 and 14, extending from this central hollow to the edge. The purpose of these channels, which 'may be either straight or curved, is to facilitate the distribution of the polishing agent over the surface of the felt. The larger the unbroken surface area of felt, the less likelihood there is of a satisfactory distribution 01 the polishing agent.
  • the polishing agent is fed to the felt, as is known, either from the centre through the shaft It], or from the periphery of the polishing head.
  • one pair of polishing heads is, of course, enough to work on the entire width of the ribbon of glass.
  • the size of the larger single-unit polishing head is, however, limited by, amongst other things, the diificulty of manipulation and the regular feeding of the polishing agent. It follows that where the width of the ribbon of glass is greater than the diameter of the large single-unit polishing head, it would be advisable to employ two or more pairs of tools of the type according to the invention.
  • a method of simultaneously polishing both surfaces of a ribbon of glass movable continuously between pairs of polishing tools disposed along the ribbon which comprises applying a polishing action over a working area on one surface of the glass by means of one single rotatable polishing element, and simultaneously applying on the opposite surface of the glass, within a working area which, when projected on to the plane of the ribbon of glass, falls wholly within the projection on to the same plane of the working area of said single polishing element, a polishing action by means of a plurality of polishing elements.
  • an apparatus for simultaneously polishing both surfaces of a continuously movable ribbon of glass means for advancing a continuous ribbon of glass progressively through the apparatus, and pairs of co-axial rotatable polishing tools, one tool of each said pair comprising a single polishing element adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element.
  • an apparatus for simultaneously polishing both surfaces of a continuously movable ribbon of glass means for advancing a continuous ribbon of glass progressively through the apparatus, and pairs of co-axial rotatable polishing tools, one tool of each said pair comprising a single polish ing element of circular shape adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element.
  • an apparatus for simultaneously polishing both surfaces of a continuously movable ribbon of glass means for advancing a continuous ribbon of glass progressively through the apparatus, and pairs of co-axial rotatable polishing tools, one tool of each said pair comprising a single polishing element having a central recess and channels extending from said recess to the periphery of the element and adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a, working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element.
  • pairs of co-axial rotatable polishing tools one tool of each said pair comprising a single polishing element adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element, and the said pairs of tools being so arranged that in each successive pair the tool comprising the said single polishing element acts on the opposite surface of the ribbon of glass as compared with the single element of the preceding pair, and yieldable mounting means for the said tools to permit of movement of said tools perpendicularly to the plane of the ribbon of glass for the purpose of exercising a yielding pressure by the said tools on the said ribbon.
  • each said pair comprising a single polishing element of circular shape adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element, and yieldable mounting means for the said tools to permit of movement of said tools perpendicularly to the plane of the ribbon of glass for the purpose of exercising a yielding pressure by the said tools on the said ribbon.
  • pairs of co-axial rotatable polishing tools one tool of each said pair comprising a single polishing element adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element, a first spindle supporting said single polishing element, a second spindle'supporting said plurality of polishing elements, means for rotating said first spindle, and means for rotating said second spindle in a direction opposite to the direction of rotation of said first spindle.
  • pairs of co-axial rotatable polishing tools one tool of each said pair comprising a single polishing element adapted to operate on one surface of the ribbon of glass and the second tool of said pair comprising a plurality of polishing elements adapted to operate, simultaneously with said single element, on the opposite surface of said ribbon of glass within a working area which, when projected on to the plane of the ribbon of glass falls wholly within the projection on to the same plane of the working area of said single polishing element, a first spindle supporting said single polishing element, a second spindle supporting said plurality of polishing elements, means for rotating said first spindle, and means for rotating said second spindle in a direction opposite to the direction of rotation of said first spindle, and the said pairs of tools being so arranged that in each successive pair the tool comprising the said single polishing element acts on the opposite surface of the ribbon of glass as compared with

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US18636A 1947-04-02 1948-04-02 Method and apparatus for polishing glass Expired - Lifetime US2508276A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR807183X 1947-04-02
FR2508276X 1947-04-02
FR637907X 1947-04-02

Publications (1)

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US2508276A true US2508276A (en) 1950-05-16

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US18636A Expired - Lifetime US2508276A (en) 1947-04-02 1948-04-02 Method and apparatus for polishing glass

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US (1) US2508276A (enrdf_load_stackoverflow)
BE (1) BE481557A (enrdf_load_stackoverflow)
DE (1) DE807183C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593465A (en) * 1968-04-01 1971-07-20 James A Krippes Concrete rail grinder
US20080280545A1 (en) * 2007-05-11 2008-11-13 Hans Weber Maschinenfabrik Gmbh Machine for dressing the edges and outer surfaces of flat workpieces

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1028458B (de) * 1951-03-14 1958-04-17 Pittsburgh Plate Glass Co Verfahren und Vorrichtung zum Polieren einer im wesentlichen fortlaufenden horizontalen Glasbahn
DE1084606B (de) * 1951-05-16 1960-06-30 Glaceries De La Sambre Sa Einrichtung zum kontinuierlichen Schleifen und bzw. oder Polieren der beiden Flaechen eines Glasbandes
DE923530C (de) * 1952-02-28 1955-02-14 Libbey Owens Ges Fuer Maschine Verfahren zum Schleifen von Flachglasscheiben
JP3793353B2 (ja) 1998-07-29 2006-07-05 本田技研工業株式会社 自動二輪車用パワーユニット

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1724703A (en) * 1923-10-29 1929-08-13 Pittsburgh Plate Glass Co Plate-glass-transfer apparatus
US1803752A (en) * 1930-02-07 1931-05-05 Ford Motor Co Glass grinding machine
US2197104A (en) * 1936-02-05 1940-04-16 Pilkington Brothers Ltd Method and apparatus for polishing traveling flat glass
US2285318A (en) * 1939-12-06 1942-06-02 Pilkington Brothers Ltd Apparatus for polishing glass
US2308976A (en) * 1942-07-04 1943-01-19 Norton Co Lapping machine
US2419926A (en) * 1944-09-13 1947-04-29 Pilkington Brothers Ltd Apparatus for simultaneously polishing both faces of a travelling strip of glass

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1724703A (en) * 1923-10-29 1929-08-13 Pittsburgh Plate Glass Co Plate-glass-transfer apparatus
US1803752A (en) * 1930-02-07 1931-05-05 Ford Motor Co Glass grinding machine
US2197104A (en) * 1936-02-05 1940-04-16 Pilkington Brothers Ltd Method and apparatus for polishing traveling flat glass
US2285318A (en) * 1939-12-06 1942-06-02 Pilkington Brothers Ltd Apparatus for polishing glass
US2308976A (en) * 1942-07-04 1943-01-19 Norton Co Lapping machine
US2419926A (en) * 1944-09-13 1947-04-29 Pilkington Brothers Ltd Apparatus for simultaneously polishing both faces of a travelling strip of glass

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593465A (en) * 1968-04-01 1971-07-20 James A Krippes Concrete rail grinder
US20080280545A1 (en) * 2007-05-11 2008-11-13 Hans Weber Maschinenfabrik Gmbh Machine for dressing the edges and outer surfaces of flat workpieces
US7775858B2 (en) * 2007-05-11 2010-08-17 Hans Weber Maschinenfabrik Gmbh Machine for dressing the edges and outer surfaces of flat workpieces

Also Published As

Publication number Publication date
BE481557A (enrdf_load_stackoverflow)
DE807183C (de) 1951-06-25

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