24-10-1935 дата публикации
Номер: GB437123A
Автор:
437,123. Tempering glass sheets. PILKINGTON BROS., Ltd., Tower Building, Water Street, Liverpool, and WILSON, J., 23, Meadow Hill Road, King's Norton, Birming- ham. April 28, 1934, No. 12878. [Class 56] A process for making tempered glass sheets consists in forming molten glass into a continuous strip by drawing or rolling, cutting the strip into sheets while the glass is still plastic, and then cooling the cut and unannealed sheets rapidly to temper them. Fig. 1 shows an apparatus in which the glass strip 1, drawn vertically upwards from a bath of molten glass, passes between chains 3 which hang from chain wheels 4 driven in unison with one another. A stamping die 9 is pivoted to . each link of the chains, and pairs of dies cooperate with one another to stamp a sheet out of the strip. Each die consists of a casing 15, Fig. 3, containing a massive plate 16, one plate being sunk in its casing while the other protrudes from its casing. Thus when the plates are pressed together, they cut a sheet out of the glass strip. Further, the sheet so cut out is rapidly chilled and tempered by contact with the plates 16 which have been cooled by water sprays from pipes 14, Fig. 1. The dies are pressed together by pneumatic cylinders 27 which are suspended by chains 23. The glass strip may also be formed by rolling, the sheets cut out of the strip being cooled by air blasts in the usual way. The strip travels over a bed and passes between a pair of rollers, one of which has end flanges which trim off the edges of the strip. Transverse cuts are then made by a knife which descends and presses a narrow strip of the glass into a slot in a member arranged in a gap in the bed. The slotted member is pivoted on its support and is caused to swing by cams, so that its upper surface moves with the glass strip while a cut is being made. The sheets cut off the strip are suspended by tongs and carried between blowing- frames of the usual kind.
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