Cutting of glass
AssigneeSaint-Gobain Industries
InventorJean Guissard
Life of this patent
Estimating the term…
Abstract
A process for automatically removing edge portions from a glass sheet comprises scoring a line of cut on a first surface of the sheet between the edge portion and the remainder of the sheet, hammering the second surface of the sheet along a path opposite the score line to initiate breakage and applying a bending force transverse to this line to the sheet at a predetermined distance from one of its ends to initiate breakage. The process is applicable to long ribbons of glass or to glass volumes having a given length and edge portions of inferior quality may be removed simultaneously from both sides of the sheet.
Claims8
An automatic method of recovering glass of good quality from a longitudinal glass ribbon having a central part of good quality and edge portions of inferior quality which comprises the steps of:
- scoring merely a line of cut on a first surface of the ribbon between the central part and the edge portion,
- hammering a second surface of the glass along a path opposite the score line to initiate breakage, the glass being subject to pressure exerted on both surfaces at points facing each other and at the point where the glass is hammered,
- bending the glass by lifting the central part of the glass adjacent the score line and rebating the edge portions to bring the surfaces of the central portion and said edge portion to predetermined angular positions to complete breakage,
- dividing the ribbon to give a sheet of the required length, and
- removing the edge portion from the central portion.
An automatic method of recovering glass of good quality from a longitudinal glass ribbon having a central part of good quality and edge portions of inferior quality which comprises the steps of:
- dividing the ribbon to gave a sheet of the required length,
- scoring merely a line of cut on a first surface of the sheet between the central portion and the edge portion,
- hammering a second surface of the glass along a path opposite the score line to initiate breakage, the glass being subjected to pressure on both surfaces facing each other and at the point where the glass is hammered,
- bending the glass by lifting the central part of the glass adjacent the score line and rebating the edge portion to bring the surfaces of the central portion and said edge portion to predetermined angular positions to complete breakage, and
- removing the edge portion from the central portion.
Dependencies are inferred from the claim text.