US1589787A - Method of laying glass sheets on worktables for grinding and polishing - Google Patents
Method of laying glass sheets on worktables for grinding and polishing Download PDFInfo
- Publication number
- US1589787A US1589787A US662620A US66262023A US1589787A US 1589787 A US1589787 A US 1589787A US 662620 A US662620 A US 662620A US 66262023 A US66262023 A US 66262023A US 1589787 A US1589787 A US 1589787A
- Authority
- US
- United States
- Prior art keywords
- plaster
- plate
- grinding
- polishing
- worktables
- 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
Links
- 238000005498 polishing Methods 0.000 title description 10
- 239000011521 glass Substances 0.000 title description 8
- 238000000034 method Methods 0.000 title description 5
- 239000011505 plaster Substances 0.000 description 24
- 230000008020 evaporation Effects 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 239000005357 flat glass Substances 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000003082 abrasive agent Substances 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000707825 Argyrosomus regius Species 0.000 description 1
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Inorganic materials [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 1
- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical compound O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
- 239000011507 gypsum plaster Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
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
- 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 improvements in plate glass manufacture and more particularly to the means for plate glass grinding and polishing.
- the rough plate In the manufacture of plate glass it is customary to secure the rough plate to be ground and polished by embedding it in a thin layer of plaster of Paris or calcined gypsum on a rotating table revolving at considerable speed.
- the grinding is usually accomplished by the application of cast iron plates'on top of the plate of glass with a stream of water and sand of varying grades of fineness between them.
- the means holding the plate on the table is subject to great strains caused by the rapid rotation of the table and the pull of the grinding and polishing means as well as the tendency of centrifugal force to cause the plate to slip off the table.
- Figure 1 illustrates a fragmentary top plan view of a form of plate glass grinding and polishing table constructed in accordance with this invention with a plate of glass thereon.
- FIG. 2 is an enlarged fragmentary view in section through the table, plaster and plate thereon, taken on the line 2-2 Figure 1.
- the embodiment of this invention as illustrated includes a'grinding and polishing table 1 of cast iron with a fiat upper surface and strengthening ribs on the under side with means for supporting it for rotation.
- the plaster 2 is spread over the fiat surface and while plastic the plate 3 is laid thereon.
- the setting of the plaster bonds the plate to the table.
- the setting is caused by the evaporation of the excess moisture in the plaster which first occurs around the edge of the plate and as this is the only place air can come in contact with the moist plaster between the table and plate the process of evaporation is not only very slow but as a rule will not extend more than eighteen inches from the edges on a plate approximately six feet square, leaving the remaining plaster in a more or less moist and plastic condition without the bonding property of the set plaster.
- a plurality of apertures 4 are provi dedthrough the body of the table,.preferably tapering in form with the greatest dimensi'on at the upper surface of the table. It is preferable to arrange these apertures at regular intervals apart throughout the surface of the table. When the plaster is spread upon the table the apertures will be filled and the plastic material retained therein as the openings are frusto-co-nical in shape.
- the tables used for this purpose are of various dimensions, some with a diameter of over thirty feet and approximately one inch in thickness. In the latter size table it is preferable to make the aperture 4 five eighths of an inch in diameter on the upper surface of the table tapering to one half inch diameter on the under side and spaced one-eighth inch centers.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
Description
June 22,1926. 1,589,787
J. W. BUTLER METHOD OF LAYING GLASS SHEETS ON WORKTABLES FOR GRINDING AND POLISHING Filed Sept. 14. 1923 IN V EN TOR.
J. W BUTLER F1- 2 B I ATTORNEYS.
Patented June 22, 1926.
UNITED STATES PATENT OFFICE.
JOHN W. BUTLER. OF CHICAGO, ILLINOIS. ASSIGNOR TO UNITED STATES GYPSUM COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.
METHOD OF LAYING GLASS SHEETS 0N WORKTABLES FOR GRINDING AND POLISHING.
Application filed September 14, 1923. Serial N0. 662,620.
This invention relates to improvements in plate glass manufacture and more particularly to the means for plate glass grinding and polishing.
In the manufacture of plate glass it is customary to secure the rough plate to be ground and polished by embedding it in a thin layer of plaster of Paris or calcined gypsum on a rotating table revolving at considerable speed. The grinding is usually accomplished by the application of cast iron plates'on top of the plate of glass with a stream of water and sand of varying grades of fineness between them. After the grinding the table is usually removed and placed under a=polishing device, preferably consisting of a felt pad containing different abrasives, and again rapidly rotated. The abrasives are subsequently washed out of the pad and the finishing is done by the genera tion of heat and the use of rouge and water During the grinding and polishing, as
above described and particularly when the plate is subject to an increaseof temperature, the means holding the plate on the table is subject to great strains caused by the rapid rotation of the table and the pull of the grinding and polishing means as well as the tendency of centrifugal force to cause the plate to slip off the table.
It has been found that smaller plates ad here to the tables better than the larger ones and that in the smaller plates substantially all of the plaster bonding them to the table has set while in the larger ones the plaster near the center at a distance from the edgeremains damp. The setting or hardening of the plaster creates the bond'between the plate and table and is caused by the evaporation of the moisture present when the plaster is applied in plastic condition upon the table and the plate laid thereover.
It is an object of this invention to produce a table on which all of the plaster will set irrespective of the size of the plate and form a positive bond throughout the entire extent of the surface of the plate in contact therewith.
With this and other objects inview reference is made to the accompanying sheet of drawing which illustrates an embodiment of this invention, however it is understood that minor detail changes may be made thereto without departing from the scope of the invention, wherever it is desired to hold a plate by a cementitious material upon a. fiat supporting surface.
In the drawings:
Figure 1 illustrates a fragmentary top plan view of a form of plate glass grinding and polishing table constructed in accordance with this invention with a plate of glass thereon.
Figure 2 is an enlarged fragmentary view in section through the table, plaster and plate thereon, taken on the line 2-2 Figure 1. v
The embodiment of this invention as illustrated includes a'grinding and polishing table 1 of cast iron with a fiat upper surface and strengthening ribs on the under side with means for supporting it for rotation. The plaster 2 is spread over the fiat surface and while plastic the plate 3 is laid thereon. The setting of the plaster bonds the plate to the table. The setting is caused by the evaporation of the excess moisture in the plaster which first occurs around the edge of the plate and as this is the only place air can come in contact with the moist plaster between the table and plate the process of evaporation is not only very slow but as a rule will not extend more than eighteen inches from the edges on a plate approximately six feet square, leaving the remaining plaster in a more or less moist and plastic condition without the bonding property of the set plaster. To overcome this objection and insure the complete evaporation of the moisture throughout the plaster under the plate and cause the plaster to set and bond the entire surface of the plate to the table, a plurality of apertures 4 are provi dedthrough the body of the table,.preferably tapering in form with the greatest dimensi'on at the upper surface of the table. It is preferable to arrange these apertures at regular intervals apart throughout the surface of the table. When the plaster is spread upon the table the apertures will be filled and the plastic material retained therein as the openings are frusto-co-nical in shape.
With a table constructed with these apertures no matter whether one or many plates are laid upon the plastic bed all of the covered plaster will be able to set as the excess moisture will not only evaporate at the edges of the plates but also through the plaster filled apertures, After the apertures are initially filled it isnot necessary to remove the set plaster therefrom when preparing the table to receive other plates of glass as the set plaster therein is porous and will absorb moisture from the moist plastic plaster when laid thereover, and the moisture so absorbed will evaporate through the lower opening in the table.
The tables used for this purpose are of various dimensions, some with a diameter of over thirty feet and approximately one inch in thickness. In the latter size table it is preferable to make the aperture 4 five eighths of an inch in diameter on the upper surface of the table tapering to one half inch diameter on the under side and spaced one-eighth inch centers.
What I claim is: i i
1. The method of preparing plates of glass for grinding and polishing consisting in applying upon a flat table having a pluuniformly.
meagre rality of tapered apertures therethrough a layer of plaster in a plastic condition which plaster fills the apertures and presents an even upper surface, placing the plate of glass to be treated upon the upper surface of the plastic layer and allowing the plastic 7 plastic state upon a fiat table having a plurality of holes therethrough, in placing a plate of glass upon the surface of the plaster and allowing the layer to dry and set, adhering to the table and the under side of the glass, the holes being spaced toexpose the plaster at intervals so it Will dry and set JOHN W. BUTLER.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US662620A US1589787A (en) | 1923-09-14 | 1923-09-14 | Method of laying glass sheets on worktables for grinding and polishing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US662620A US1589787A (en) | 1923-09-14 | 1923-09-14 | Method of laying glass sheets on worktables for grinding and polishing |
Publications (1)
Publication Number | Publication Date |
---|---|
US1589787A true US1589787A (en) | 1926-06-22 |
Family
ID=24658450
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US662620A Expired - Lifetime US1589787A (en) | 1923-09-14 | 1923-09-14 | Method of laying glass sheets on worktables for grinding and polishing |
Country Status (1)
Country | Link |
---|---|
US (1) | US1589787A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2699633A (en) * | 1949-02-09 | 1955-01-18 | Optron Lab | Precision supporting of articles |
US2736996A (en) * | 1951-12-19 | 1956-03-06 | Pittsburgh Plate Glass Co | Plaster applicator |
US3064401A (en) * | 1960-09-02 | 1962-11-20 | Bausch & Lomb | Method of making aspheric optical elements |
US3101576A (en) * | 1962-08-09 | 1963-08-27 | Libbey Owens Ford Glass Co | Grinding and polishing glass plates |
-
1923
- 1923-09-14 US US662620A patent/US1589787A/en not_active Expired - Lifetime
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2699633A (en) * | 1949-02-09 | 1955-01-18 | Optron Lab | Precision supporting of articles |
US2736996A (en) * | 1951-12-19 | 1956-03-06 | Pittsburgh Plate Glass Co | Plaster applicator |
US3064401A (en) * | 1960-09-02 | 1962-11-20 | Bausch & Lomb | Method of making aspheric optical elements |
US3101576A (en) * | 1962-08-09 | 1963-08-27 | Libbey Owens Ford Glass Co | Grinding and polishing glass plates |
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