US3353304A - Surface treatment of glass and apparatus therefor - Google Patents

Surface treatment of glass and apparatus therefor Download PDF

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Publication number
US3353304A
US3353304A US463248A US46324865A US3353304A US 3353304 A US3353304 A US 3353304A US 463248 A US463248 A US 463248A US 46324865 A US46324865 A US 46324865A US 3353304 A US3353304 A US 3353304A
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Prior art keywords
blocks
link
frame
links
plate
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US463248A
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English (en)
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Chaumont Henri Jules
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Compagnie de Saint Gobain SA
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Compagnie de Saint Gobain SA
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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
    • B24B7/247—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 using reciprocating grinding tools

Definitions

  • the present invention relates to the grinding and polishing of sheet glass by means of pads which are positively moved relatively to the sheet while in contact therewith. More particularly the invention relates to the situation wherein the grinding or polishing is effected by pads which move in a predetermined orbital or like path while the sheet of glass moves horizontally in the direction of its length between them.
  • Another object is to provide an apparatus wherein the pad is connected with two power-driven blocks through a linking structure which provides a limited freedom of expansion or contraction between said blocks.
  • Another object is to provide an apparatus wherein the pad is connected with its power-driven operating means, through an articulated system or links which, while effecting positive movement of the pad directly in accordance with the corresponding movement of the powerdriven cranks, at the same time permits free movement of the pad toward and from the work, in a direction normal to the surface of the sheet so that force applied to the pad in the aforesaid direction is directly and fully applied to the work, resulting in uniform pressure of the pad upon the surface of the sheet.
  • a further object in accordance with that of the preceding paragraph is the provision of an apparatus wherein the pad is free to move normal to the surface of the sheet so that it remains in full surface contact therewith and engages the sheet with even and uniform pressure until the applied forces are manually or automatically changed.
  • Another object is to provide an apparatus as aforesaid which assures the precise and accurate execution of the orbital or other desired motion of the grinding or polishing pad at all times, under all conditions of use, and irrespective of the particular value of the pressure of the pad upon the sheet, while allowing free manual of surfacing machines and which accurately transmits and reproduces the motion of its power-driven mechanism to the surfacing plate or frame and the pad carried v thereby.
  • a system of three links and two cranks or other mechanical means for initiating the desired orbital movement The first or central of the three links is pivoted on a first axis to the polishing pad plate or frame.
  • the second link is articulated at one end to a corresponding end of the first link and at its other end to one of the cranks, while the third link is articulated at one end to the other end of the first link and at its other end to the other crank.
  • Other links are used to effect direct connection between the cranks and pad frame to assure that the pad accurately and positively reproduces the orbital or translatory movements of the driving means.
  • the resulting structure is indeformable in a plane parallel with the surface of the sheet, but readily permits or adapts itself automatically to movements normal to said plane.
  • the structure will further permit and adapt itself to accidental limited variations of the distance between the two power-driven means, such as would occur because of heat-expansion of the supporting frame or of a slight variation in the synchronism of these means.
  • the two cranks or other power-driven moving means impart equal forces to the linkage, so that there is no resultant force which might otherwise tend to distort or deform the same. Nor is there any resultant force developed by the linkage normal to the plane of the sheet.
  • the operation is smooth, even and uniform. Pressure is uniform over the area of the pad and can be accurately gaged to assure a superior and accurately finished surface on both faces of the sheet.
  • FIGURE 1 is a perspective view showing one embodiment of the invention
  • FIGURE 2 is a side elevation showing a construction in which the pad is arranged for surfacing the lower surface of the sheet of glass, and depicting the three interpivoted links forming an important feature of the invention
  • FIGURE 3 is a cross section in a plane identified by line ?i3, FIGURE 2, looking in the direction of the arrows;
  • FIGURE 4 is a plan view of the apparatus of FIG- URES 2 and 3, as seen from above.
  • 1 and 2 represent first and second driving elements shown in the form of rectangular or square thrust blocks each driven by a respective one of a pair of vertically-disposed crankshafts 1a and 2a.
  • the crank of shaft 1a is journaled t0 element 1 by an antifriction bearing 1b.
  • a corresponding bearing 2b connects the crank of shaft 2a to and centrally of element or block 2.
  • the cranks have equal throws and the shafts are so arranged, interconnected and driven, that their crank radii are at all times parallel.
  • Any suitable means such as gears, chain and sprockets, shafts and bevel gearing, etc, may be provided to interconnect the two shafts for synchronous rotation in the same direction.
  • FIGURES -2 and 3 there is identified a rectangular plate, beam or frame, to the under side of which, in a known way, a polishing pad 17, FIGURES -2 and 3, may be attached.
  • a U-shaped bracket 9 has its central or bight portion secured at 10a centrally to the face of frame 10 opposite to that to which the pad is attached.
  • a first link 5 has aligned trunnions 5a extending from its central portion. These trunnions are pivoted at 8' in the ends of the upstanding arms of bracket 9 so that the link is pivotable about an axis parallel with frame 10 and, when the device is operating, parallel with the surface of the sheet of glass being worked.
  • a second link 3 has one end pivotally connected to element 2 at 6, and its other end pivoted to the adjacent end of link 5 at 3a.
  • a third link 4 has one ribbed for greater rigidity. Links 3 and 4 are formed with forked ends.
  • one forked end thereof embraces the contiguous end of link 5 and a pivot pin not shown, passes through aligned holes in the two links.
  • the other forked end of link 3 embraces a pierced lug 6a integrally attached to one side edge of element 2, and a second pivot pin passes through aligned holes in the lug and link.
  • Link 4 is essentially like link 3 in shape, size and effective length. Its pivotal connection with link may be a duplicate of that interconnecting links 3 and 5.
  • element 1 has a lug 1c upstanding from its top surface as viewed upon FIGURE 1, and adjacent and parallel with one side edge thereof. This lug is pierced and a pivot pin passes through and is secured in the aligned holes of the lug and forced end of the link.
  • the construction and arrangement are such that plates or elements 1 and 2 are normally coplanar despite a small angularity of link 5 with respect to the plane of frame 10.
  • links 3 and 4 While normally essentially parallel with the plane of frame '10 are at slightly different elevations thereabove.
  • the linkage thus described resists twisting of frame about a normally vertical axis, with respect to elements 1 and 2, as well as about a horizontal axis parallel with the longitudinal axis of the frame, but permits limited vertical displacements between the frame and elements without, however, varying the relation between the effective lengths of the links, that is, their lengths projected upon the plane of frame 10 or, in operation, upon the plane of the sheet of glass being surfaced.
  • a notch 1d therein receives one end of a link 11 with a pivotal connection between them about an axis parallel with the longitudinal axis of the frame.
  • a U-shaped bracket has its central bight portion rigidly attached at A to the upper surface of frame 10 adjacent one side edge thereof.
  • FIGURES 2, 3 and 4 schematically illustrate the general arrangement of parts when the apparatus is disposed to Work upon the lower surface of the sheet of glass.
  • FIGURES ,2'and 3 23 identifies generally a'base or frame of the machine and havingspaced vertically-disposed aperturesor guides 24 and 25 in which are mounted casings 26 and 27, respectively. These casings may be hollow and contain the mechanism indicated at 1a and 2a,
  • FIGURE 1 to protect the same against damage from grinding compound, moisture, dust and dirt.
  • the upper surfaces of these casings are fiat and coplanar, and each supports its block 1 and 2 for sliding on its surface'by and in response to rotation of shafts 1a and 2a. It is contemplated that antifriction thrust bearings of known construction will be provided between the upper surface of each casing and its thrust block 1 or 2, as the case may be.
  • block 1 has a pair of transversely spaced lugs fixed to its upper face
  • frame 10 has a pair of forked lugs 31, 32 fixed to its lower surface and forked to pivotally receive the ends of threaded rods 20 and 33. All axes of pivotal connection, as between 21 and 28 for example, are normal to the plane of FIGURE 3.
  • a turnbuckle 22 interconnects rods 20 and 21 so that, in the usual way, turning thereof in one direction or the other correspondingly varies the spacing of the frame with respect to the blocks.
  • rods 30 and 33 are connected by turnbuckle 34 which may be actuated to similarly increase or decrease the separation of these rods. In this way the elevation of the continguous end of frame 10 above block 1 may be varied.
  • a similar pair of rods and turnbuckles adjustably connect block 2 and the other end of frame 10. Since these are duplicates of those described in the preceding para graph, it is suflicient, referring to FIGURES 2 and 4, to identify one turnbuckle 19, rods 35 and 36 connected thereby, and forked lugs 37 and 38 fixed, respectively to block 2 and frame 10.
  • casings 26 and 27 may be made vertically adjustable each in its aperture '24, 25, with respect to frame 23. Such adjustment may be made by mechanically, pneumatically or hydraulically operated means, not shown. The adjustment thus provided for is within small limits and is compensated by a slight pivoting of links 3, 4, 5, 1-1 and '12 and which in no way affects the accuracy of operation of the invention.
  • links 3, 4 and 5 will pivot slightly and automatically'adjust themselves to the new distance separating blocks 1 and 2.
  • the weight of the frame may be assisted by hydraullically or pneumatically-operated means to exert a controlled downward thrust upon the frame in a manner similar to that applied by the turnbuckles of FIGURES 2, 3 and 4.
  • a plate having a planar surface to which a pad may be attached for frictional contact with the sheet glass, a pair of thrust blocks, means operable to move said blocks in unison in a predetermined path having mutually-normal components parallel to said surface, first link means between said blocks and plate to transmit one of said components of motion to said plate, and second link means between said blocks and plate to transmit the other said component of motion to said plate.
  • a grinding and polishing apparatus for sheet glass comprising, a plate having a planar surface to which a pad may be secured, and having mutually normal first and second axes in said surface, a pair of thrust blocks mounted in spaced relation along said first axis, a first link mounted on said plate for pivoting about an axis parallel with said second axis, second and third links each connected at one end to a respective one of said blocks and at its other end to a respective end of said first link, and power driven means engaging said blocks and operable to move the same and said plate in a predetermined path.
  • said last-named means comprising a pair of parallel spaced shafts each having a crank at its end journaled to a respective one of said blocks.
  • An apparatus for surfacing a sheet of glass moving in the direction of its length comprising, plate means having a planar surface over which a surfacing pad may be secured, first and second thrust blocks spaced along a first axis in said surface, a first link pivoted between its ends to said plate means, second and third links each pivoted at one end to a respective one of said blocks and at its other end to a respective end of said first link, all pivot axes of said first, second and third links being parallel with said surface and normal to said first axis, fourth and fifth links each pivoted at one end to a respective one of said blocks and at its other end to said plate means, the pivot axes of said fourth and fifth links being parallel to said first axis, and power-driven means connected with said blocks to move the same equally and in synchronism in a plane parallel with said surface.
  • said power-driven means comprising first and second shafts each mounted with its axis of rotation normal to said surface, each said shaft having a crank on its end journaled in a respective one of said thrust blocks, said shafts being rotated in synchronism with their crank radii parallel.
  • Apparatus for surfacing sheet glass comprising, a frame having a planar surface to which a surfacing pad may be attached, first and second spaced thrust blocks, a first link, means pivoting said link between its ends to said frame, second and third links each having one end pivotally connected with a respective one of said blocks and its other end pivotally connected with a respective end of said first link, all pivot axes of said first, second and third links being parallel and parallel with said surface, fourth and fifth links each pivoted at one end to a respective one of said blocks and at its other end to said frame, the pivot axes of said fourth and fifth links being parallel with said surface and normal to the pivot axes of said first, second and third links, and thrust means between said frame and blocks and operable to vary the spacing therebetween.
  • said last-named means comprising a first plurality of rods of adjustable length each pivoted at one end to said first block and at its other end to said frame, and a second plurality of rods of adjustable length each pivoted at one end to said frame and at its other end to said second block, the pivot axes of all said rods being parallel with the pivot axes of said fourth and fifth links.
  • An apparatus for surfacing sheet glass comprising, a plate having a planar surface to and over which a surfacing pad may be secured, first, second and third bracket means rigid with said plate, first and second thrust blocks spaced in a first direction parallel with said surface, a first link pivoted between its ends in said first bracket means, second and third links each pivoted at one end to a respective one of said blocks and at its other end to a respective end of said first link, fourth and fifth links each pivoted at one end in a respective one of said second and third bracket means, and at its other end to a respective one of said blocks, said first link being inclined to said surface, said second, third, fourth and fifth links being essentially parallel with said surface, the pivot axes of said first, second and third links being parallel and normal to the parallel pivot axes of said fourth and fifth links, all said pivot axes being parallel with said surface, spaced parallel vertically disposed first and second crankshafts having equal crank radii, and means journaling the crank of each said shaft in a respective one of said surface
  • a grinding and polishing apparatus for sheet glass comprising:
  • a plate having a planar surface to which a pad may be secured

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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)
US463248A 1964-07-15 1965-06-11 Surface treatment of glass and apparatus therefor Expired - Lifetime US3353304A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR981719A FR1409372A (fr) 1964-07-15 1964-07-15 Perfectionnement aux dispositifs pour le doucissage ou le polissage des feuilles de verre

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5181342A (en) * 1990-08-17 1993-01-26 Haney Donald E Sander with orbiting platen and abrasive
US5321913A (en) * 1990-08-17 1994-06-21 Haney Donald E Sander with orbiting platen and abrasive
US20030124961A1 (en) * 2001-08-02 2003-07-03 Haney Donald E. Sanding machine incorporating multiple sanding motions
US7004818B1 (en) 1990-08-17 2006-02-28 Haney Donald E Sander with orbiting platen and abrasive

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2955389A (en) * 1958-09-15 1960-10-11 Saint Gobain Apparatus for grinding and polishing glass
US2984051A (en) * 1957-04-11 1961-05-16 Saint Gobain Apparatus for surfacing glass
US3263376A (en) * 1959-12-16 1966-08-02 Libbey Owens Ford Glass Co Method for surfacing glass

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984051A (en) * 1957-04-11 1961-05-16 Saint Gobain Apparatus for surfacing glass
US2955389A (en) * 1958-09-15 1960-10-11 Saint Gobain Apparatus for grinding and polishing glass
US3263376A (en) * 1959-12-16 1966-08-02 Libbey Owens Ford Glass Co Method for surfacing glass

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5181342A (en) * 1990-08-17 1993-01-26 Haney Donald E Sander with orbiting platen and abrasive
US5321913A (en) * 1990-08-17 1994-06-21 Haney Donald E Sander with orbiting platen and abrasive
US5443414A (en) * 1990-08-17 1995-08-22 Haney; Donald E. Sander with orbiting platen and abrasive
US5702287A (en) * 1990-08-17 1997-12-30 Haney; Donald E. Sander with orbiting platen and abrasive
US7004818B1 (en) 1990-08-17 2006-02-28 Haney Donald E Sander with orbiting platen and abrasive
US20030124961A1 (en) * 2001-08-02 2003-07-03 Haney Donald E. Sanding machine incorporating multiple sanding motions
US7198557B2 (en) 2001-08-02 2007-04-03 Haney Donald E Sanding machine incorporating multiple sanding motions

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Publication number Publication date
FR1409372A (fr) 1965-08-27

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