FI89584B - Anordning Foer boejning av glasskivor - Google Patents

Description

Equipment for bending glass sheets. - Anordning för böjning av glasskivor.

1 89584

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 with the bending furnaces described in U.S. Patents 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 techniques.

The object of the invention is to further develop this type of equipment so that with a simple equipment solution, additional heating can optionally be applied to awkward 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 a side view of an apparatus according to the invention; 2 89584 Fig. 2 shows an essential part of the apparatus on the other side of the bending section as seen in the longitudinal direction of the furnace; 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. The roof of the bending section shown in Fig. 1 has an electric resistance field 26 with which the glass sheet 2 is heated to the final bending temperature.

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 mounted with 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 section has a lifting device provided with a horizontal bracket 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 carriage, along which the mold carriage 3 with its bent and cooled glass sheets 2 can be returned to the loading end of the furnace. The furnace compartments are located to the right of the bending compartment shown in Figure 1. In order to lower the mold carriage 3a and 1, the lifting carriage brackets 3 are slightly raised so that the rollers 22 can be pulled to the side, whereby the rails 21 are released and pass down the ends of the rollers 22.

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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 worm gear 10.

Attached to one or both of the horizontal brackets 4 is a connection box 13e 13 through which four bolts 24 are passed, the upper ends 14 of which act as coupling pins. Between the connecting piece 13 and the ends 14 are springs 25 which allow a spring-loaded movement of the coupling pins 4 towards the connecting piece 13. The bolts 24 are connected by conductors 12 to an electrical source. The conductors 12 can be, for example, inside the heritic tubes 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 is driven to a predetermined position and the horizontal brackets 4 are driven up. Thus, 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 the mold carriage 3 in a predetermined position from below. The bolts 17 are connected by conductors 18 to 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 transmit electrical power to the two coupling pins 11a by means of four coupling pins11a. It is clear that the number or placement of the splitting resistors 19 is not limited in any way. One or more additional resistors 19 may optionally be enabled by switching its electrical power on or off by switches between the conductors 12 and the electrical source B9584 (not shown).

To a computer program that controls the bending of a glass plate, which e.g. determines the distribution and resistance time of the resistance field 26, the addition can be made, which controls when each additional resistor 19 is on and for how long. The program can also take care of which carriages 1 the additional resistors 19 are switched on.

Thus, it has been realized in the invention that a lifting device previously used only to move the mold carriage 3 from the upper track to the lower track can now be used to supply and connect electric power to the local heating resistors which, when attached to the mold carriage or mold, can be placed close to the glass plate. precisely to the desired points in terms of area of influence and heat output.

Claims (5)

5,89584 An apparatus for bending glass sheets, the apparatus comprising an edge mold (1) supporting the heated glass sheet (2) during bending, a movable mold carriage (3) supporting the mold (1), and a lifting device (4-11) for supporting the mold carriage (3). and for moving vertically, characterized in that the mold (1) or carriage (3) has heating resistors (19) for local heating of the glass sheet (2) and the mold (1) or carriage (3) has heating resistors (19) with conductors (18) associated lifting pins (15), and the lifting device (4-11) has connecting pins (14) connected to the power supply by conductors (12) adapted to collide with the carriage or mold coupling pins (15) when the mold carriage (3) is at least partially 11) supported or when the mold carriage (3) in a predetermined position is approached from below by a lifting device (4-11). Apparatus according to Claim 1, characterized in that the coupling pins (14) of the lifting device (4-11) are mounted on the horizontal bracket (4) of the lifting device, on which the carriage (3) 1 disengages. Apparatus according to Claim 1 or 2, characterized in that one of the coupling pins (14) of each pair of coupling pins (14, 15) is retractable against the spring force (25). ____ Apparatus according to one of Claims 1 to 3, characterized in that the connecting pins (14, 15) are the ends of bolts (17, 24) which are guided through the connecting pieces (13, 16). Apparatus according to claim 1, characterized in that the computer program controlling the bending controls 6 89584 when each additional resistor (19) is connected and for how long. 7 89584