US1956781A - Glass grinding apparatus - Google Patents

Glass grinding apparatus Download PDF

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Publication number
US1956781A
US1956781A US690449A US69044933A US1956781A US 1956781 A US1956781 A US 1956781A US 690449 A US690449 A US 690449A US 69044933 A US69044933 A US 69044933A US 1956781 A US1956781 A US 1956781A
Authority
US
United States
Prior art keywords
grooves
operative surface
grinding apparatus
glass
abrasive
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
US690449A
Other languages
English (en)
Inventor
Waldron Frederic Barnes
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
Original Assignee
Pilkington Brothers 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 Pilkington Brothers Ltd filed Critical Pilkington Brothers Ltd
Application granted granted Critical
Publication of US1956781A publication Critical patent/US1956781A/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
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B24D7/04—Wheels in one piece with reinforcing means
    • 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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece

Definitions

  • This invention relates to glass grinding apparatus and has for its object means for forcing the abrasive towards the glass.
  • the grinding tool commonly used is a rotating disc provided with nogs or blocks of cast iron generally of rectangular form.
  • each block has its leading face inclined to the radius forwardly (in reference to the direction of rotation) and outwardly, and also forwardly away from its operative surface.
  • Figure 2 is a section thereof along the line 22 of Figure 1;
  • Figure 3 is a section along the crooked line 3-3 of Figure 1;
  • Figure 4 is a diagrammatic plan showing a single block
  • Figure 5 is a perspective view of Figure 1, looking down at an angle of to the horizontal.
  • the circular disc 1 with operative surface 2, commonly made in cast iron, is attached to the flange 3 of the tool.
  • the disc 1 has a central aperture 4, surrounding which, is an annular channel 5 with an approximately central web 11. Outside this channel 5, is the operative surface 2, which is divided into three rings by two circular grooves 6. Of these three rings, the two inner ones are divided up into blocks or-nogs 7 by grooves 8, while the outer ring has similar grooves 8 which do not, however, extend tothe periphery of the disc 1.
  • grooves 8 are inclmed to the radii outwardy and forwardly in the direction of rotation, as seen in Figurel.” 'rFur-ther, the grooves are inclined to the surface oi' gthe disc, as shown in Figure 3, the
  • Abrasive (commonly sand and water) is supplied through the hole 9 to the central aperture 4 65 and passes below the inner wall 10 of the channel 5.
  • Apertures 12 in the web 11 (only one such aperture is represented in Figure 1) permit the abrasive to rise into the upper part of the channel 5, and from this the abrasive is forced outwardly along the grooves 8 by centrifugal force.
  • the particle in fact, will tend to move along a path such as CF, in which its motion is not accelerated, and this path brings it from the bot- 35 tom of the groove to the operative surface.
  • each block '7 having its leading face 13 inclined to the radius outwardly and forwardly and forwardly away from its operative surface.
  • the leading faces 13 are shown shaded in Figure 5.
  • the tool described above gives blocks of this form and can be conveniently manufactured from a disc of cast iron.
  • the tool may be constructed by bolting blocks on to a fiat disc.
  • the circular grooves 6 do not form an essential part of the invention, but it is preferable for the sake of better distribution, that the inclined grooves 8 should be connected by cross grooves.
  • the circular grooves 6 or other cross grooves may be so inclined, that the inner face of each block is inclined inwardly away from the operative surface, so that the centrifugal force acting on the abrasive against the inner faces, tends to move it towards the operative surface.
  • the abrasive is not, however, so readily engaged between the operative surface and the glass, as when it is brought to the surface at the leading faces of the blocks. 1
  • the inclination of the leading faces of the blocks to the radii is preferably made greater, the greater the distance of the block from the centre.
  • the invention is particularly applicable to glass grinding apparatus operating on the underside of the glass, when gravity tends to keep the abrasive the leading face of each block being inclined both to the radius and to the operative surface, the inclination to the radius being such that as the radius increases the face extends from the radius in the direction of rotation and the-inclination to the operative plane being such that portions away from the operative surface are further forward than portions nearer to the operative surface.
  • a grinding runner having its operative surface formed into blocks by grooves in a disc adapted to lead the abrasive outwardly and cross-connecting grooves, the first mentioned grooves being inclined to the radii forwardly and outwardly and also inclined to the operative surface in a direction forwardly away from the surface.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
US690449A 1932-09-22 1933-09-21 Glass grinding apparatus Expired - Lifetime US1956781A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB26382/32A GB407407A (en) 1932-09-22 1932-09-22 Improvements in glass grinding apparatus

Publications (1)

Publication Number Publication Date
US1956781A true US1956781A (en) 1934-05-01

Family

ID=10242765

Family Applications (1)

Application Number Title Priority Date Filing Date
US690449A Expired - Lifetime US1956781A (en) 1932-09-22 1933-09-21 Glass grinding apparatus

Country Status (5)

Country Link
US (1) US1956781A (fr)
BE (1) BE398709A (fr)
DE (1) DE660280C (fr)
FR (1) FR760986A (fr)
GB (1) GB407407A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597187A (en) * 1949-02-26 1952-05-20 Crane Packing Co Adjustable lap
US3111791A (en) * 1962-07-27 1963-11-26 Harry J Harris Automatic lapping machines
US5681216A (en) * 1996-02-06 1997-10-28 Elantec, Inc. High precision polishing tool

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL91439C (fr) * 1952-03-20
DE1195632B (de) * 1954-09-08 1965-06-24 Glaceries De La Sambre Sa Einrichtung zur Foerderung und Verteilung des Bearbeitungsmittels fuer ein Werkzeug zum Bearbeiten eines Glasbandes
US2859565A (en) * 1955-01-31 1958-11-11 Pilkington Brothers Ltd Apparatus for grinding flat glass on both faces simultaneously
GB2344302B (en) * 1997-09-01 2002-11-06 United Microelectronics Corp Chemical-mechanical polishing machine and retainer ring thereof
GB2345255B (en) * 1998-12-29 2000-12-27 United Microelectronics Corp Chemical-Mechanical Polishing Pad
US6974372B1 (en) * 2004-06-16 2005-12-13 Rohm And Haas Electronic Materials Cmp Holdings, Inc. Polishing pad having grooves configured to promote mixing wakes during polishing

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2597187A (en) * 1949-02-26 1952-05-20 Crane Packing Co Adjustable lap
US3111791A (en) * 1962-07-27 1963-11-26 Harry J Harris Automatic lapping machines
US5681216A (en) * 1996-02-06 1997-10-28 Elantec, Inc. High precision polishing tool

Also Published As

Publication number Publication date
BE398709A (fr)
DE660280C (de) 1938-05-23
FR760986A (fr) 1934-03-07
GB407407A (en) 1934-03-22

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