US2023275A - Method and means for surfacing glass - Google Patents

Method and means for surfacing glass Download PDF

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Publication number
US2023275A
US2023275A US682601A US68260133A US2023275A US 2023275 A US2023275 A US 2023275A US 682601 A US682601 A US 682601A US 68260133 A US68260133 A US 68260133A US 2023275 A US2023275 A US 2023275A
Authority
US
United States
Prior art keywords
glass
polishing
bristles
brushing
glass surface
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
US682601A
Other languages
English (en)
Inventor
Long Bernard
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 US2023275A publication Critical patent/US2023275A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/04—Hand tools or other devices for non-rotary grinding, polishing, or stropping resilient; with resiliently-mounted operative surface
    • 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
    • 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
    • B24B7/241—Methods

Definitions

  • This invention relates to a method and means for surfacing glass and refers more particularly to a method and means for polishing mirrors and other sheet glass articles.
  • the surfaces of these materials are usually first subjected to a grinding process and are then polished.
  • the grinding process consists of two steps, the coarse grinding and the fine grinding by emery.
  • the ground surfaces are still comparatively rough after the grinding process has been completed, the unevenness of these surfaces preventing the glass from being transparent.
  • the ground surfaces are 15 then polished and they become quite smooth and even only as a result of this polishing.
  • the polishing process is also usually divided into two steps, the first one being called the first polishing, or the preliminary polishing, while the second step is called the finishing, or the final polishing.
  • polishing blocks which were moved over the surface of the glass.
  • These polishing blocks have surfaces consisting of felt, cloth or even bituminous substances, such as pitch, for instance, mineral pitch, which carry abrasives, such as metallic oxides, for instance iron oxide and aluminium oxide. It was found, however, that the polishing by these blocks requires a considerable amount of time; it seldom takes less than three quarters of an hour, and in most cases it has to be continued for more than one hour.
  • the polishing surfaces made of felt must have a certain amount of moisture and the quality of the work depends largely on the amount of moisture used.
  • An object of this invention is to provide a method and means for polishing glass articles, by which the polishing operation may be completed in a relatively short time.
  • a further object is the provision of a device with which the regulation of the amount of 5 moisture contained in the polishing surface is much easier.
  • the above and other objects of this invention may be realized through the use of a method of brushing the glass surface by brushes made of a not readily corrodible metal.
  • the bristles of these brushes consist, preferably, of brass and are very thin and pliable, the diameter of the bristles being about 8/100 to 10/100 of a millimeter.
  • the ends of the bristles areimmersed into a mixture of water and metallic oxides, such as iron oxide, and are then moved over the surface of the glass.
  • This method of brushing the glass surfaces is also, preferably, divided into two steps, namely the first or preliminary brushing and the second or final brushing; it is used in combination with the grinding process and is applied after the grinding has been completed.
  • the drawing is a partial side view and vertical section of a brush applied to the surface of a glass article.
  • the brush illustrated in the drawing consists of parallel metallic holders I and thin metallic bristles 2, which are firmly connected with the holders 1.
  • the holders are fastened by bolts 3 to a circular plate 4 which is driven by a rotating shaft 5.
  • the bristles 2 are made of a not readily corrodible metal, such as brass.
  • the free ends 6 of the bristles 2 carry a mixture I, which consists of water and one or more oxides, for instance 40 iron oxide.
  • the ends 6 of the metallic bristles 2 are moved by means of the plate 4 over the surface 8 of the glass sheet 9, which is carried by a support Ill.
  • the brush is passed over the sheet 9 until the surface 8 of the sheet is made com pletely smooth and even.
  • a further advantage of these brushes is that it is easy to clean them since the water and the oxides penetrate very readily into the spaces 'between the thin bristles and can be quickly removed from them whenever necessary.
  • the brushing of the glass surfaces may be used as a substitute for both the first or preliminary polishing and for the final or second polishing.
  • the pressure which the brush exerts on the glass surface should be about 2 kgs. per sq. dcm.; the speed with which the brush is moved with respect to the glass may vary from 2 to 5 meters per second.
  • the second brushing used as a substitute for the final polishing, is carried out at a pressure of about 1 kg. per sq..dcm.
  • the velocity with which the brush is moved with respect to the glass surface is doubled and may reach as much as meters per second.
  • the brushing method which forms the subject-matter of the present invention, may be used in combination with the usual polishing method, in the course of which a polishing surface consisting of felt and pitch is used.
  • This combined brushing and polishing method is applied when the original grinding process was not successful so that the ground surface remains very rough and uneven.
  • the first step of the combined brushing and polishing process consists in surfacing the glass by means of brushes provided with metal bristles.
  • the second. step comprises the use of polishing surfaces made of felt carry- 5 ing metallic oxides.
  • the method of polishing a glass surface which comprises brushing the same with metallic bristles and a mixture of water and an abrasive 10 carried by the ends of said bristles by causing a relative movement between said bristles and the glass surface while the ends of said bristles are maintained in contact with the glass surface during the entire polishing and are pressed against the glass surface with a force which is independent of the velocity of the relative movement between the bristles and the glass surface, whereby a uniform and simultaneous action of the metallic bristles and the abrasive upon the treated glass surface is assured.
  • Means for surfacing glass comprising a plurality of metallic bristles, each of said bristles having a diameter ranging between five hundredths and fifteen hundredths of a millimeter, a mixture of water and an abrasive carried by the ends of said bristles, a support adapted to carry the glass surface to be treated, a plate extending substantially parallel to said glass surface, means for attaching said metallic bristles to said plate, and means connected with said plate for rotating the same around a central axis which is substantially perpendicular to said glass surface and which extends in substantially the same direction as that of said bristles, the last-mentioned means maintaining the ends of said bristles incontact with the glass surface during the entire polishing and pressing them against said glass surface with a force which is independent of the velocity of the movement of said bristles in re- .lation to the glass surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Surface Treatment Of Glass (AREA)
US682601A 1932-08-09 1933-07-28 Method and means for surfacing glass Expired - Lifetime US2023275A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR754303X 1932-08-09

Publications (1)

Publication Number Publication Date
US2023275A true US2023275A (en) 1935-12-03

Family

ID=32606107

Family Applications (1)

Application Number Title Priority Date Filing Date
US682601A Expired - Lifetime US2023275A (en) 1932-08-09 1933-07-28 Method and means for surfacing glass

Country Status (6)

Country Link
US (1) US2023275A (fr)
BE (1) BE397508A (fr)
DE (1) DE616641C (fr)
FR (1) FR754303A (fr)
GB (1) GB409943A (fr)
NL (1) NL37249C (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597182A (en) * 1949-03-31 1952-05-20 Libbey Owens Ford Glass Co Surfacing glass sheets or plates
US2740980A (en) * 1953-02-25 1956-04-10 Charles T Asbury Apparatus for cutting and abrading
US4734953A (en) * 1986-10-17 1988-04-05 Dodson Kenneth E Dual brush assembly for cleaning both iron and wood type golf heads

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597182A (en) * 1949-03-31 1952-05-20 Libbey Owens Ford Glass Co Surfacing glass sheets or plates
US2740980A (en) * 1953-02-25 1956-04-10 Charles T Asbury Apparatus for cutting and abrading
US4734953A (en) * 1986-10-17 1988-04-05 Dodson Kenneth E Dual brush assembly for cleaning both iron and wood type golf heads

Also Published As

Publication number Publication date
GB409943A (en) 1934-05-10
DE616641C (de) 1935-08-01
BE397508A (fr)
NL37249C (fr)
FR754303A (fr) 1933-11-06

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