DE1596491A1 - Method and device for bending glass panes - Google Patents

Description

H. SEILER, J. PFENNINO ■, «« «<,« ■ March 9, 1966

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PA T EN TAN Wj, L T E

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LlBBET- OWEiMS - FOHD GLASS COMPlNY, oil 1 Madison Avenue, Toledo, Ohio (USA).

Method and device for bending glass panes

Me invention relates to an improved method as well as a device for bending glass sheets into certain Curvatures. *

Curved glass panes of the kind that the invention relates in particular to are generally used as glazing in vehicles or the like. In using them for this purpose, the sheets of glass are cut to size and within tight tolerances of a preselected outline and shape. due to the size of the opening to be glazed and the overall construction of the vehicle on which they are to be used, bent to the prescribed curvature. Usually, after the curved panes have been bent, they are heat treated, either by annealing them to remove internal stresses present in the glass panes. removed or hardened to increase the strength of the glass panes and to change the fracture properties of the glass. 109810/04 90 -2-

The Dautldian Patantcmwaltittammar, - G.rlttitiitand IQr performance and payment ι Bariin-Chailoltanburg applies to the order warrant Gaipiddia am Faintpradiar has no «raditsvarblndlidia effect, Bnnkkontoi Berliner Bank A -Q, Berlin 13, Dep-Kaaae 44, current account No. O7 230 / PoatBOheokkonto: Berlin WSOaÖ

BATH ORIGINAL

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Usually curved ones are economical to manufacture Sheeting of glass using one or the other of two fairly common basic methods. In general the first known as press bending Process, the glass panes are heated to the softening point of glass and then between matching, i.e., complementary mold surfaces are formed on cooperating molds. A very essential one The disadvantage of the press-forming process is that that the main surfaces of the glass panes touched by the shaping surfaces present on the molded parts and through they are subjected to pressure while they are in a heated, softened state, which is what it is makes it difficult to maintain the original smoothness of these surfaces. It stands to reason that any damage or distortion of the main parts of the vehicle window panes Or the like. Provided glass panes is harmful, if this damage or distortion is considerable enough that it can render the disks completely unusable for their intended purpose.

The other basic method by which sheets of glass are bent is to hold a flat sheet of glass on a mold which has shaping surfaces' conforming to the desired curvature of the sheet when bent and, while it is so held ,

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exposed to a heated atmosphere to raise its temperature to the softening point of glass, so that see the disc under the action of gravity can lower or bend against the shaping surfaces of the mold. In this so-called "gravity bending ver- ■ drive "- (" gravity bending "procedure) become the main areas of visibility the heat-softened pane did not attempt to damage or distort the glass surfaces Pressing exposed. Furthermore, by using a Skeletal or circumferential shape with one only against the Eand sections the shaping surface that rests on the glass pane makes contact between the viewing areas of the pane and the shape can be completely eliminated or avoided.

It is clear that when bending sheets of glass with the help of the gravity bending process, the extent of the lowering or sagging of the glass pane and thus the the curvature assumed by it depends on the temperature to which it is heated and on "the length of time, during which the glass is kept at this temperature. During production, it is important to ensure that each one Number of panes of glass consistently in the same curvature is bent and that this curvature is within the prescribed Tolerances, a very precise control of the heating of the panes is required. Sometimes kick Difficulty in maintaining this precise control however, any deviation from the optimal conditions in a production series can lead to some rejects.

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BATH ORIGINAL

The object underlying the invention is therefore to create an improved method as well a device for precisely bending glass panes of the aforementioned type in precisely defined curvatures, while the main areas of the panes are essentially kept free from damage or distortion.

Another object of the invention is the glass panes to bend initially by means of gravity or its own weight on a contour bending form and then to press the glass tightly against the shaping surfaces formed on the bending mold.

The invention is explained in more detail below with reference to the accompanying drawings. Show it:

Pig. 1 is a side view of a bending and hardening device with the novel features of the invention,

Pig. 2 shows a partial section through the bending device with the representation of the glass pane against the shaping device Surface of the form pressed! «Age,

Pig. 3 is an end view of the bending device after Pig. 1,

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4 shows a perspective partial view of the bending device, illustrating the pressing part and FIG the shaping rail of the mold, and

Pig. 5 one the actuation ^ - and the control mechanism for the bending device according to the invention illustrative schematic representation*

According to the invention, a method for bending glass panes is disclosed around its two main axes in proposal, in which a sheet of glass to be bent on a bending form is held, which has a shaping surface, against which only the edge sections of the pane rest 'and which forms an anticlastic curvature in the glass pane bent in accordance with it, characterized in that the pane is down to the softening point of the glass is heated to allow it to sag or bend to effect against the shaping surface and up to a partially shaped state, whereupon you put pressure on the disc exercises to fit them tightly with the shaping surface To press touch.

According to the invention, there is also a device for bending of glass panes around their two main axes · proposed with an outline bending mold, which is a shaping Has face for forming an anticlastic curve in a sheet of glass bent in accordance with it,

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characterized by means for heating a flat pane of glass held above the shaping surface in order to raise the temperature of the pane to the softening point of the glass, so that it sags or sags in the direction of the shaping surface and into a partially shaped state, wherein Means are provided which bring the partially formed disc into snug contact with the forming surface
press to shape the scüe disc into the preselected anticlastic curvature.

For the purpose of illustration, the invention has been shown in the drawings in conjunction with apparatus 10 suitable for use in the economical manufacture of bent glass sheets in accordance with common practice today. In these bending practices, a sheet of glass 11 to be bent is held on a form 12 carried by a frame 13 and is passed through an oven 14 to the sheet of glass up to
to warm to the softening point of glass, whereupon
they are curved on one formed on the shape
After the glass sheet has been bent and is still held on the mold, it is passed through a cooling device 15, which can bring about the reduction in the temperature of the glass in a controlled manner.

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In business establishments one uses a number together essentially matching bending shapes, which are successively passed through the furnace and through the cooling device be passed through in order to continuously bend and heat treat a sheet of glass.

The illustrated shape 12 is a skeletal or oversized shape and has a continuous shaping rail 16, which consists of two longitudinally extending side parts 16a and two transversely extending iJndteile 16b, which are connected to one another by curved corner sections 16c so that they one uilden closed ring. As from the I ¹ Ig. 2 and 4, the shaping rail 16 of the mold can have the shape of a casting surrounded by a stiffening rail 17 which is connected to the shaping rail by transverse webs or spacers 19 inserted between the shaping rail and the stiffening rail is to increase the rigidity of form. On the upward-facing side of the shaping rail there is formed a shaping surface 20 which corresponds in its outline and elevation to the desired outline and the curvature of the bent glass pane and which receives the pane when it is lowered onto the mold. Strut or cross members 21, which are made of extending across the shape, with their

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opposite ends of the stiffening and the shaping rail attached rods, stiffen the rails to form a rigid unitary component.

In the illustrated shape, the shaping rail 16 delimits a substantially rectangular outline ab and the parts of the shaping surface of the side parts 16a are in a side view to a convex curvature formed, while the parts of the shaping surface of the end portions extending in the transverse direction are formed into a concave curvature in a side view are so bent in one in accordance with them Glass pane creates an anticlastic curvature. It should be noted here, however, that the outline shape of the shaping rail and the curvature of the shaping surface solely depends on the size, the shape and are dependent on the curvature of the curved G-I as disc * In addition, the structure of the form is to a certain extent prescribed by the special curvature to be given to the glass pane. Thus, in the production of flat bends as usual in the present case a so-called "Vollringform" ("solid ring" mold) of the type illustrated here is used, while for more complex bending forms a so-called "hinge shape" ("hinged" mold) is used, the shaping rail in a number of articulated sections,

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is split between an open and move towards each other in a closed position or can be adjusted.

The frame 13 on which the mold 12 is supported, consists of two side rails 22 and two end portions 23 _and which are arranged so that they have a more open. NEN, form a substantially rectangular frame within the boundaries of which the shape is arranged. The side rails 22 of the frame 13, which are curved so that they substantially match the curvature of the forming rail 16, extend along the opposite sides of the mold 12, with their opposite ends at the upper corners of the vertically arranged, substantially rectangular end parts 23 are attached. The mold is supported by the frame by means of spaced transverse bars 24, are the erstelfungsschiene under the side parts 1.6a of the shaping rail 16 and the J 17 and are attached to them and with their opposite ends to the side rails 22 of the rack 13 are attached.

In operation, the flat glass pane 11 after it has been placed in the correct position on form 12, with the aid of the frame 13 on a roller conveyor 25 extending through the furnace through the furnace

BATH ORIGINAL

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worn, wherein the glass panes soften and lower in the direction of the shaping surface 20 of the mold ^. To that of the disc during the bending process To use the supplied heat for heat treatment of the glass, the curved glass panes are when exiting the exit of the furnace carried by the mold into and through the cooling device 15. in which the temperature of the glass panes is lowered in a controlled manner. To do this, a stand out from the exit of the furnace to the outside and through the cooling device extending additional conveyor 27 is provided to to form a continuous, substantially straight path of movement on which the molds are advanced.

The device shown as an example is particularly suitable for the production of curved, hardened Glass panes, namely because the glass panes 11 after they are bent and on the forming surface 20 of the form 12 rest when leaving the exit of the Furnace 14 are exposed to a quenching atmosphere in order to keep them from the elevated bending temperature up to a To cool down or quench the temperature below the cooling range of glass. For this purpose, the Discs passed between oppositely arranged blow heads 28, the flows ratio- * can direct massive amounts of cool air from both sides against the panes. As shown in Figs. 1 and 3, have the

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Blow heads 2b above and below the path of movement of the molds 12 arranged air chambers 29 and elongated, in the transverse direction arranged, apertured ribs 30 that are curved to match the curvature of the Adapt the shape and the glass panes resting on it, projecting inwardly from each of the air chambers towards the mold and the pressurized one Direct cooling air from the air chambers 29 against the top and bottom of the panes. the inner ends of the opposing ribs 30 are sufficiently separated from each other to allow the shapes to pass between them.

According to the embodiment shown, the conveyor 27 has two endless chains 31 parallel to one another, which extend in the longitudinal direction along the movement path and the front parts 23 of the frame 13 can accommodate. The chains are driven around sprockets 32, which are firmly connected to shafts 33 which are mounted on U-parts 34 which are held by supports 35 arranged separately from one another along the path of movement will. To ensure perfect alignment each runs between the mold and the die Chain 31 on the bottom of an upwardly open track 36, so that the front parts of the frame 13 be guided through the side walls of the track 36. As can be seen from Fig. 1, is in the illustrated embodiment

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guide example the trace from one along the Movement path extending and attached to the U-parts 34 TJ part 37 formed. . ■

As discussed above, the fact is whether the pane of glass assumes the desired curvature or not, depending on whether the disc is up to its contact with the shaping surfaces around all the edges of the hand around the disc or not. This in turn is dependent on the temperature of the heated atmosphere in the furnace and on the length of time during which the pane is exposed to this heated atmosphere. With In other words, the pane must be heated up to a temperature at which the glass softens and it loses its rigidity so that it can lower itself against the shaping surface 20. Since the fprmgeenden Surface only touches the edge sections of the pane, is the extent of the curvature between the marginal edges lying portions of the disc depends on how much the disc descends further after the edge edges rest against the shaping surfaces.

As pointed out above, since the discs within relatively close tolerances a predetermined curvature must be bent, the temperature to which the panes are heated is critical. Unless the slices are sufficient except for one

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When the temperature is heated, they do not decrease to the extent that they are with the shaping surface of the form coincide and they also have little or all of them between the marginal edge sections no curvature, on the other hand, if the panes can sink too far, too much arises Curvature. When it comes to the economical production of curved glass panes. it is extremely difficult to get an exact Control the required temperature to bring about the heated atmosphere, making it so difficult is to produce discs in which the required curvatures are consistently within the prescribed tolerances.

According to the invention, the aforementioned shortcomings and disadvantages are eliminated by pressing the heated glass panes against the shaping surface of the mold, so that it is ensured that the glass panes adopt or assume the exact curvature delimited by the shaping surface of the mold. For this purpose, according to the invention, the provision of a pressing element 38 arranged adjacent to the extension of the furnace H and between the furnace and the blow heads 28 is proposed, which brings the calibrated into contact with the top of the heated, curved glass pane resting on the contour bending mold 12 Läset to press the disc between itself and the shaping PXäOhe 20 of the mold.

BATH ORIGINAL

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According to the illustrated embodiment, the pressing part 38 is attached to a matching frame 39 attached above the movement path of the panes so that it can be moved up and down against the bending molds in relation to the frame when they move under the pressing part 38. The frame 39 consists of two posts 40 on either side of the movement path of the glass panes, which are arranged vertically and separated from one another in the longitudinal direction of the movement path and which are aligned in pairs with one another in the transverse direction of the movement path.
The upper ends of the posts 40 are through an im
essentially rectangular frame 41 connected to one another, which is provided at each corner with an opening for receiving the upper end of the post in question. The frame 41 is with the help on the upper ends of the
Post screwed and set against the top of the frame 41 abutting nuts 42 in its correct position.

The pressing part 38 is attached to the frame 39 with the aid of a substantially rectangular holder 43 arranged between the frame 41 and the conveyor 27.
Each corner of the bracket 43 has one with the bracket
One-piece eye that has a cylindrical bore 45 for receiving the relevant post
having. In the holes 45 are on the post

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Slidable sockets 46 used, which with the help of a Locking screw 47 are set in the bores, so that they the vertical displacement movement of the Guide bracket 43.

The pressing part 38 is fastened to the holder 43 by means of bolts 48 which protrude through a flange 49 provided on the pressing part and plates 50 fastened to the holder. .-

There are between the plates 50 and the pressing part 38 acting elastic means provided that the pressing part act on the bracket away and make it possible that the pressing part upwards when it touches the glass pane resting on the bending form can yield in order to avoid exerting excessive pressure on the glass panes. According to the The illustrated embodiment consist of the eiastic

see smock from the bolts 48 bypassing coil springs 51, which rest or act between the underside of the plates 50 and the upper side of the flange 49. The springy etc. yielding movements of the pressing part 38 with respect to the bracket guided by pins 52 which protrude upward from the pressing part and are attached to the bracket Sockets 52a are displaceable.

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The springs 51, together with the bolts 48, also serve to enable the position of the pressing part to be adjusted in relation to the holder 43 in order to align the pressing part precisely with the shaping surface of the mold. ^{For this purpose, nuts 53 are} screwed onto the upper ends of the bolts so that they rest against the plates, so that the aforementioned adjustment is possible by screwing the nuts onto the bolts so that the springs are compressed or relieved.

As can be seen from the above, the mold 12 when leaving the exit of the furnace 14 by the conveyor. 27 brought into position below the pressing part 38. When the mold is in place, the bracket 43 slides down the post 40 around the presser 38 to bring into contact with the pane of glass 11 and place it tightly and firmly against the forming Surface 20 of the mold 12 to be pressed. For this purpose, the pressing part 38 is provided with a shaping surface which has a to the curvature of the shaping surface of the mold 12 has matching, i.e. complementary, curvature.

According to the illustrated embodiment, the Pressing part 38 a continuous shaping surface 54 » that can touch the entire top of the respective pane of glass. The shaping surface 54 has one to the Top of the finished bent disc matching, i.e.

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1596431

complementary, shape. The shaping surface 54 is in Side view over its entire width in the Longitudinal dimension 54a concave and over its entire length curved convexly in the transverse dimension 54b. On the other hand Way not only the edges of the disc with the shaping surfaces of the bending form in intimate, brought close contact, but also between the form-giving surfaces of the form lying sections of the disc bent into the desired anticlastic curvature.

The positioning of the mold 12 under the pressing part 38 in a perfectly aligned position is achieved with the aid of a suitable stop mechanism 55 (FIG. 1), which has a finger 56, which in its working position protrudes into the plane of the path of movement of the mold so that it with the front end of one moving on the trajectory. Frame comes into abutment and allows you to retract into a position clearing the path of frame 13, which enables the unimpeded advancement of the molds on the path of movement, and has an actuating device or an actuating cylinder 57 for adjusting the finger between its aforementioned two positions. With the help of suitable control means to be described in more detail below, the actuating device can be actuated in such a way that the finger is in its working position.

SAD ORIGINAL

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position is guided to the movement of the frame 13 to interrupt on the path of movement and to bring the mold 12 under the pressure part 38 in position. After this the pressing part has fulfilled its task, i.e. after it has been pressed down against the glass pane and has thereafter been returned to its uppermost position, the finger 56 is withdrawn to the To enable the frame 13 to be moved forward on the path of movement and between the blow heads 28.

The back and forth movement of the pressing part 38 towards and away from the path of movement of the molds is effected with the aid of a reversible actuating device 58 which acts between the holder 43 and the frame 41 in such a way that the holder 43 up and down on the post 40 slides. According to the illustrated embodiment, the actuating device 58 consists of a device comprising a piston and cylinder, wherein, as illustrated in the drawing, preferably two such devices are used, one of which is attached to each end of the holder. Each actuator 58 has a vertically displaceable in a mounted on the frame cylinder 59 double-acting piston, the driven member or piston rod is fixed to the bracket 43 60, via suitable conduits 61 is required, either at the head or at the piston-side end of the cylinder, a pressure medium

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introduced to move the piston in the cylinder. The pressure medium is introduced with the aid of conventional control means to be described in more detail below controlled.

Fig. 5 shows a suitable one in a schematic representation Control mechanism for the novel bending device according to the invention. The frame 13 is so when you leave of the furnace carried forward on the conveyor 27 on which it interrupts the light beam 62 emanating from the light source 63 of a photoelectric unit 64 exits, which in a suitable manner to the power supply lines 65 and 66 connected xat, which in turn are connected via a switch 67 to an electrical energy source. the Light receiving unit 68 of the photoelectric unit transmits a signal to a control center 69 which energizes a coil 70 of a double electromagnet 71 to a .Relay 72 to shi ess. By closing the Relay is a circuit from the line 65 via a line 73, the relay 72, a line 74, a pressure medium pump 75 and a line 76 to the line 66 is established. The. Pump 75 presses pressure medium from a container 77 through a conduit 78 into the lower end of the cylinder 57 so that the piston moves into the cylinder, so that the finger 56 attached to it moves into the path of movement of the frame 13 moving forward. The finger thus lies against the front end

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of the advancing. Frame and so interrupts its movement to the shape below the pressing part 38 properly to bring into position.

The signal from the light receiving unit is also a second control center 79 that after the mold 12 has been stopped in its correct position is excited a coil 80 of a double electromagnet 81, to close a relay 82 and a circuit from the line 65 via the line 73, the relay 82, a line 83 and a pressure medium pump 84 to the line 66 to manufacture. The pump 84 presses pressure medium from a container 85 via the lines 61 into the head-side End of the cylinder 59 to move the piston rods 60 downwards so that the pressing part 38 is down against the on the shaping surface of the outer circumferential shape 12 resting glass pane is pressed. After the pressing part has reached its lower end of the stroke, the control Center 79 the other coil 86 of the double electromagnet 81 to the circuit for the pressure medium pump 84 to open ", so that the supply of pressure medium into the head-side end of the cylinder 59 stops and a circuit from the line 65 via the line 73, the relay 82, a line 87 and a pressure medium pump 88 to line 66 "as shown in FIG. 5. The pump 88 presses pressure medium from the container 85

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the lines 61 in the lower end of the cylinders 59 »um retract the piston rods 66 into the cylinders and raise the pressing part · 38.

When the pressing part 38 is raised, the other Coil 89 of double electromagnet 71 energized. this causes the circuit for the pressure medium pump to open 75 and provides a circuit from line 65 via line 73> the relay. 72, a line 90, a pressure medium pump 91 and a line 92 to the line 66 ago. The pump 91 presses pressure medium out of the container 77 via a line 93 i & the head end of the cylinder 57 »in order to withdraw the stop finger 56. The frame 13 is then moved forward on the path of movement of the conveyor and removed from the pressing part, whereupon the device is ready to repeat the cycle with the approach of the next mold.

From the foregoing, it makes sense that with the help of the Method and device according to the invention glass panes fairly accurately within very close tolerances Defined curvatures can be bent. While the respective pane of glass is at its highest temperature, it is only touched at its edge so that it is guaranteed that your field of vision or vision is not damaged or distorted. After the disc a curvature very approximate to the desired curvature

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■. - BAD ORIGINAL

assumed or received, ^j it is touched by the pressing part, which ensures that the disc is brought into the desired or required curvature. Since the pane is very close to the desired or required curvature at the point in time when it is touched by the pressing part, there is only a very slight relative movement, if at all, between the pressing part and the glass pane, so that the tendency to damage to the disc is minimal. In addition, pressure is only exerted against the non-critical edge sections of the pane, since the intermediate sections of the pane can yield unhindered to the forces exerted by the pressing part.

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Claims (8)

Dr. ^ -23- ■ P.ä t e'n-t a η s ρ r ü! C h e; ' 1. Method of bending sheets of glass around their two Main axes, in which a pane of glass to be bent is held on a bending form, which is a shaping one Surface against which only the! Landab Make cuts on the disc and cut into the in Accordance with her curved pane of glass forms an ahticlastic curvature, characterized by this , "that you move the disc (11) to 'the. Softening point of the glass is heated. to lower or bend it to effect against the shaping surface (20) and up to a partially shaped state, whereupon one - exerts pressure on the disc (11) in order to bring it into close contact with the shaping surface (20) to press. ' 2. The method according to claim 1, characterized in that the pressure is exerted on substantially the entire surface of the disc (11) opposite the shaping surface (20) in order to bring the edge portions of the disc into close contact with the shaping surface (20) press and bend the inner sections of the disc into the anticlastic curve. _8AD 09810 / 049Q ; ϊϊ: ϊ _. = . -24- 3. The method of claim 1, wherein -which the bending shape one in side view convex in the longitudinal dimension has curved shaping surface which is concavely curved in the transverse dimension in side view, thereby characterized in that the pressure is exerted on the upturned side of the partially formed disc (IT) is going to make their edge sections face down with the to press the shaping surface (20) into tight contact and the inner sections of the disc (11) to bend into the anticlastic curve. 4. The method according to any one of claims 1 to 3> in which the shape and the pane to be bent that it holds along a certain path of movement through an oven are moved forward, characterized in that the glass pane (11) when it passes through the door Oven (14) heated to the softening point of the glass so that the disc (11) is in .Direction on the shaping surface (20) and lowers into a partially shaped state, whereupon the advance of the mold (12) is interrupted at a predetermined point, around the disc (11) with a pressing part (58) arranged above the movement path, to the shaping surface (20) of the mold (12) complementary shaping surface (54). for cover to bring, then the pressing part (38) with the top of the disc (11) is brought into contact ^BAD ORIGINAL or 109810/0490 * r ^L ~ & ~ the: washer (11) down against the one on the mold (1.2) to press the existing shaping surface (20) and they to bend into the anticlastic shape, after which the disc along the trajectory of the predetermined The body is moved forward and hardened by cooling air while holding it on the mold (12) directed against her * 5. Apparatus for performing the method according to claim 1 to 4 with a contour bending form that has a forming surface for forming an anticlastic curvature in accordance with her curved pane of glass, characterized by Mittelzum Heating a flat sheet of glass (11) held above the shaping surface (20) in order to Increase the temperature of the pane up to the softening point of the glass, so that it is in Direction towards the shaping surface and down to one partially formed state lowers or sags, wherein Means (38) are provided which bring the partially formed disc (11) into tight contact with it the shaping surface (20) press around the disc to shape into the preselected anticlastic curvature. 6. Apparatus according to claim 5, wherein the contour bending mold one in side view in the length dimension convexly curved and in side view in the transverse 10 98 107 04 90 bad original _ ₂₆ _ ι? dimension has a concave curved shaping surface, characterized in that the means that the partially -shaped disc (11) with the shaping Press the surface (20) into close contact, a pressing part (38) arranged above the mold (12) have, on its downward facing side a to the shaping surface (20) of the mold (12). complementary anticlastic shaping surface (54) comprising means for attaching the pressing member (38) to move it towards and from the mold away between a first position, in.which the complementary shaping surface (54) at a distance is arranged above the mold, and a second position in which the complementary shaping Area (54) is located in the .Nnah of the shaping surface (20) present on the mold (12), and Means are provided to the pressing part (38) between its first and second position back and forth to move forward. 7. The device according to claim 6, wherein the shaping Surface of the contour bending form is formed from a shaping rail, which consists of two each other opposite, separated from each other, extending in .Longitudinal direction side parts and two transversely extending, the adjacent ends of the two side parts mi together 10 9810/0490 connecting .andteile consists, the -sections of the shaping surface of the side parts are convexly curved in side view in order to form a corresponding convex curvature in the disc in the longitudinal dimension over its entire length, and the sections of the shaping surface of the Jindteile are concave in a rare view in order to form a corresponding concave curvature in the transverse dimension of the disc over its entire length, and means are provided which project the shape along a predetermined movement path, as well as an oven arranged on this movement path, which heats the disc to the softening point of the Glass brings about, characterized in that the pressing part { 38) is arranged above the movement path and'holder means (43) hold the pressing part (38) so that it is' between a first position in which the complementary shaping surface (54) in a distance above the mold (12) is arranged, and a second position ung, in which the complementary shaping surface (54) is located in the immediate height of the shaping surface (20) present on the mold (1 2), move towards and away from the bending mold (12) in relation to the path of movement leaves in order to press the glass pane (11) resting on the shaping surface (20) with the shaping surface (20) into close contact to form the anti- ORIGINAL BATHROOM -28- 109810/0490 ■ '■ · clastic curvature in the disc (11)? VvO for means of actuation that the pressing part (58) m timed relation to the movement the mold (12) along the movement path between its first and second position hm and move forward. 8. The device according to .Anspruch 7, characterized in that dc.no the complementary shaping surface (54) on the downward facing oeite of the pressing part it (;> b) in oeitenansicht m the iiängsdimension concavely curved and in side view in the ^ uerdimension is convexly curved, the holding means (43) for the .anpresteil (.3b) to move it towards the bending form (12) and away from it bring the complementary shaped surface with the top of the oche disc (11) in contact with their To press edge sections with the shape-bonded surface (20) on the bending mold (12) m close contact and to bend the inner sections of the ocheibe (11) into the predetermined anticlastic curvature. Godmother V !? Seiler and P ^r - "" ^{!: Nfr} 109810/0490