Overpressure-assisted gravity bending method and device suitable therefor
First Claim
1. A device for bending at least one glass pane, comprising:
- a gravity bending mould with a supporting surface, which is suitable for arranging at least one glass pane thereon; and
an upper shaping tool arranged opposite the supporting surface, the upper shaping tool being suitable for producing an overpressure on a first surface of the at least one glass pane arranged on the supporting surface, the first surface facing away from the supporting surface, wherein the upper shaping tool has a cover that forms a hollow space open in a direction of the gravity bending mould and comprises a flexible sealing lip disposed between the cover and the first surface when contacting the first surface, the flexible sealing lip comprising a first portion contacting an edge section of the cover on a side of the edge section facing the hollow space and a second portion, integral with the first portion, distanced and extending apart from the edge section of the cover towards a region interior to the hollow space for making contact with the first surface, the second portion containing a weighting belt, and wherein the upper shaping tool is equipped with means for introducing a gas into the hollow space in order to produce the overpressure.
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Accused Products
Abstract
The present invention relates to a device and method for bending at least one glass pane. The device includes: a gravity bending mould with a supporting surface, which is suitable for arranging at least one glass pane thereon; an upper shaping tool arranged opposite the supporting surface, the upper shaping tool being suitable for producing an overpressure on a surface of the at least one glass pane arranged on the supporting surface, and the surface of the at least one glass pane faces away from the supporting surface. The shaping tool has a cover that forms a hollow space open in the direction of the gravity bending mould and is equipped with a sealing lip arranged on an edge section of the cover for making contact with the surface of the at least one glass pane, and the shaping tool is equipped with means for introducing a gas into the hollow space in order to produce the overpressure.
101 Citations
20 Claims
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1. A device for bending at least one glass pane, comprising:
- a gravity bending mould with a supporting surface, which is suitable for arranging at least one glass pane thereon; and
an upper shaping tool arranged opposite the supporting surface, the upper shaping tool being suitable for producing an overpressure on a first surface of the at least one glass pane arranged on the supporting surface, the first surface facing away from the supporting surface, wherein the upper shaping tool has a cover that forms a hollow space open in a direction of the gravity bending mould and comprises a flexible sealing lip disposed between the cover and the first surface when contacting the first surface, the flexible sealing lip comprising a first portion contacting an edge section of the cover on a side of the edge section facing the hollow space and a second portion, integral with the first portion, distanced and extending apart from the edge section of the cover towards a region interior to the hollow space for making contact with the first surface, the second portion containing a weighting belt, and wherein the upper shaping tool is equipped with means for introducing a gas into the hollow space in order to produce the overpressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- a gravity bending mould with a supporting surface, which is suitable for arranging at least one glass pane thereon; and
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12. A method for bending at least one glass pane, comprising:
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arranging at least one glass pane on a supporting surface of a gravity bending mould; heating the at least one glass pane to at least its softening temperature; producing an overpressure on a first surface of the at least one glass pane facing away from the supporting surface using an upper shaping tool that has a cover that forms a hollow space open in the direction of the gravity bending mould and comprises a flexible sealing lip disposed between the cover and the first surface and contacting the first surface, the flexible sealing lip comprising a first portion contacting an edge section of the cover on a side of the edge section facing the hollow space and a second portion, integral with the first portion, distanced and extending apart from the edge section of the cover towards a region interior to the hollow space for making contact with the first surface, the second portion containing a weighting belt, wherein the overpressure is produced by introducing a gas into the hollow space; and cooling the glass pane. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method of using an upper shaping tool that has a cover that forms a hollow space open in the direction of the gravity bending mould and comprises a flexible sealing lip arranged on an edge section of the cover, for assisting a gravity bending process, wherein, with the upper shaping tool, an overpressure is produced on the first surface of a glass pane facing away from a gravity bending mould, by disposing the flexible sealing lip between the cover and a first surface of the glass pane, the flexible sealing lip comprising a first portion contacting the edge section of the cover on a side of the edge section facing the hollow space and a second portion, integral with the first portion, distanced and extending apart from the edge section of the cover towards a region interior to the hollow space for making contact with the first surface, the second portion containing a weighting belt, bringing the sealing lip into contact with the first surface and introducing a gas into the hollow space.
Specification