FI89584C - Device for bending glass sheets - Google Patents

Description

1 89584

Equipment for bending glass sheets. - Anordning for bojning av glasskivor.

The invention relates to an apparatus for bending glass sheets, the apparatus comprising an edge mold supporting the heated glass sheet during its bending, a movable mold carriage supporting the mold, and a lifting device for supporting and moving the mold carriage vertically.

The apparatus according to the invention is particularly well suited for use in connection with the bending furnaces described in U.S. Pat. Nos. 4,497,645 and 4,986,842. However, the invention is also suitable for use in connection with bending furnaces in which the movement of the mold carriages takes place in a manner different from the above-mentioned patents.

Especially when bending vehicle glasses, there is often a need today to provide relatively complex bending shapes that cannot be achieved with conventional gravity bending and edge molding technology.

The object of the invention is to further develop this type of equipment in such a way that, with a simple device solution, additional heating can optionally be applied to difficult bending points.

This object is achieved by the apparatus according to the invention: by means of the features set out in the appended claim 1.

In the following, an embodiment of the invention will be described in more detail with reference to the accompanying drawings, in which Figure 1 shows an apparatus according to the invention seen from the side; 2 89584 Fig. 2 shows an essential part of the apparatus on the other side of the bending section in the longitudinal direction of the furnace as seen; and Figure 3 shows detail III of Figure 1 on a larger scale.

Figure 1 shows an edge mold 1, the mold surface of which substantially corresponds to the desired bending shape of the edge area of the glass sheet. The mold 1 supports a bent glass sheet 2, which has already been heated in the oven compartments preceding the bending section close to the final bending temperature 1aa. The roof of the bending section shown in Fig. 1 has an electric resistance field 26 with which the heating of the glass sheet 2 to the final bending temperature takes place.

The ring mold 1 is supported by the mold carriage 3. Attached to both sides of the mold carriage 3 are the side supports 20 shown in Fig. 2, to which rails 21 are attached, on which the carriages 3 can be moved along the path formed by the rollers 22. The sidewalls of the bending compartment and the preceding furnace compartments are thus supported by tracks formed by successive rollers 22, as described in more detail in U.S. Patent Nos. 4,497,645 and 4,983,201.

The bending compartment has a lifting device provided with horizontal consoles 11a 4, with which the mold carriage 3 can be moved vertically. In the case shown, the primary function of the lifting device is to lower the mold carriage 3 from the upper roller track to the lower roller 1 aradal 1e, along which the mold carriage 3 with its bent and cooled glass sheets 2 can be returned to the furnace loading head. The furnace compartments are located on the right side of the bending compartment shown in Figure 1. In order to lower the mold carriage 3a and 1 with the lifting brackets 4, the mold carriage 3 is slightly raised so that the rollers 22 can be pulled to the side, whereby the rails 21 are released and pass past the ends of the rollers 22 downwards.

3,89584

There are, for example, two horizontal consoles 4, one on each side of the bending compartment. The base ends of the horizontal brackets 4 are connected to a carriage 5 which is guided to move vertically along a vertical column 6. The opposite ends of the chain 7 are fixed to the carriage 5 and the chain 7 passes over the drive gear 8 and the folding wheel 9. The gear 8 can be rotated back and forth by the motor 11 via a helical gear 10.

Attached to one of the two horizontal brackets 4 is an orientation cap 13, through which four bolts 24 are guided, the upper ends 14 of which act as coupling pins. Between the connecting piece 13 and the ends 14 there are springs 25 which allow the spring-loaded movement of the coupling pins 4 towards the connecting piece 13. The bolts 24 are connected by conductors 12 to the power supply. The conductors 12 can be, for example, inside the joint pipes in the common protective tube 23.

Attached to the side support 20 of the carriage 3 is a second connecting piece 16 which also has four through bolts 17, the ends 15 of which form coupling pins which coincide with the coupling pins 14 when the carriage 3 has been driven to a predetermined position and the horizontal brackets 4 are driven. Thus, an electrical contact takes place between the coupling pins 14 and 15 when the mold carriage 3 is at least partially supported by the horizontal brackets 14 or when the horizontal brackets 4 approach from below in a predetermined manner. to mold 1. The location of the electrical resistors 19 is preselected to provide suitable additional heating to awkward bending locations. In the case shown, it is possible to pass the electrical power of the four switching pin pairs 11a to the double resistor 19. It is clear that the number or placement of the single resistors 19 is not limited in any way. One or more auxiliary resistors 19 may optionally be enabled by turning its electrical power on or off by switches (not shown) between the conductors 12 and the source of the electrical B9584.

To a computer program that controls the bending of a glass plate, which e.g. Depending on the resistance field 26 and the temperature distribution, an increase can be made to control when each additional resistor 19 is on and for how long. The program can also take care of the operation of the mile carriages with 1 resistors 19.

Thus, it has been realized in the invention that the lifting device, which was previously only used to move the mold carriage 3 from the upper track to the lower track, can now be used to supply and switch electric power to the local heating could be precisely targeted to the desired points in terms of their area of influence and thermal power.

Claims (5)

An installation for bending glass sheets, to which an installation has an edge mold (1) which carries a heated glass sheet (2) during its bending, a movable mold carriage (3) which supports the mold (1), and a lifting device (4-11) to support and guide the mold carriage (3) vertically, characterized therefrom, that the Shape (1) or the carriage (3) has heating resistor (19) for local addition heating of the glass sheet (2) and the mold (1) or the carriage (3) has coupling pins (15) connected to the heating resistors (19) by connecting pins (15), and the lifting device (4-11) has a coupling pins (14) which are adapted to meet electrically cooled by lines (12), which are adapted to occur opposite each other. -draw in line with the coupling pin (15) of the carriage or mold, when the carriage (3) is supported at least partially by the lifting device (4-11) or when the carriage (3) is approached in a predetermined lower position by the lifting device (4-11) . Installation according to claim 1, characterized in that the coupling pin (14) of the lifting device (4-11) is mounted in the horizontal bracket (4) of the lifting device, on which the carriage (3) rests. Installation according to Claim 1 or 2, characterized in that each coupling pin pair (14, 15) provides one: coupling pin (14) against a spring force (25). Installation according to any one of claims 1-3, characterized in that the coupling pins (14, 15) are constituted by the spirit of bolts (17, 24) guided through the coupling pieces (13, 16). : 5. Installation according to Claim 1, characterized by character. therefore, that a buoyancy controlling computer program controls,. ·. reaches the respective additional resistance (19) years on and how long.