Severing by tearing or breaking – Breaking or tearing apparatus – Combined with preliminary weakener or with nonbreaking cutter
Reexamination Certificate
1999-07-07
2001-08-21
Rachuba, M. (Department: 3724)
Severing by tearing or breaking
Breaking or tearing apparatus
Combined with preliminary weakener or with nonbreaking cutter
C225S094000, C225S097000, C225S103000
Reexamination Certificate
active
06276585
ABSTRACT:
This invention relates to an apparatus for separating a plurality of pre-scribed shapes from a glass sheet.
In the manufacture of, for example, rearview mirrors for vehicles, a number of mirror shapes are scribed in a sheet of glass. However, the glass sheet still has a great deal of integrity and the shapes do not simply fall out if the sheet is lifted. Current practice is therefore to break the prescribed mirror shapes out of the glass sheet by hand.
It is an object of the invention to provide an apparatus in which this process is automated.
According to the present invention there is provided an apparatus for separating a plurality of pre-scribed shapes from a glass sheet, the glass sheet having opposite parallel edges and a margin along each edge of the sheet free of the pre-scribed shapes, the apparatus comprising means for automatically breaking the glass sheet progressively along each margin to cause the glass sheet to fracture along scribe lines defining the pre-scribed shapes.
Preferably the apparatus includes a conveyor for transporting the glass sheet in a given direction parallel to its edges with the margins accessible from both sides of the sheet, and a pair of glass-cracking means located substantially directly opposite one another on opposite sides of the conveyor respectively and each arranged to bear repetitively on opposite sides of a respective margin as the sheet is conveyed therepast.
In a first embodiment of the invention each glass-cracking means comprises a pair of jaws which open and close on the respective margin as the sheet is conveyed.
In a second embodiment of the invention each glass-cracking means comprises a pair of toothed wheels between which the margin passes as the sheet is conveyed.
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Donnelly Mirrors Limited
Rachuba M.
VanDyke, Gardner, Linn & Burkhart, LLP
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