DE1168022B - Method and bending form for bending glass panes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Boarding school KL: C 03 b

German class : 32 a - 23/02

Number: 1 168 022

File number: L 30418 VI b / 32 a

Filing date: May 14, 1958

Opening day: April 16, 1964

The invention relates to a method and a bending mold for bending glass panes, the except the normal deflection should receive a twist at the end sections. The overlay such a twist over the normal bending process brings with it very great difficulties. This is all the more true, the sharper the bend and the longer the panes to be bent.

So far, attempts have been made to overcome this problem by removing the end sections of the Hinged joint bending forms in a special way, so that they overall the rotational movement to be communicated to the disk carried out. This required specially designed joints, swivel axes, which can be used in at a certain angle to the main axes of the form, etc., all facts that are not just the Make the shape complicated, but also have repercussions on the normal bending process.

In contrast, the invention consists in that the end portion of a pane of glass while he is with one corner is held at the level of the initial support, from the other corner progressing with its shaping rail is brought into contact.

With the help of the invention one can use very simple ² S joint bending forms, in particular those whose joint axes are parallel to the transverse center line of the form. There is therefore no need for a complicated hanging mechanism for the end sections. The end sections only need to be adapted to the twisted disk end section in the closed position of the mold; in the open mold position, on the other hand, only one corner of the mold frame needs to be level with the support surface of the flat disc. The rigid support point at the opposite corner of the pane is completely sufficient, as has been shown, to ensure that the pane is properly held during bending. It is particularly advantageous that the shaping end rail gradually comes into contact with the front edge of the disc end section progressing from one corner, because this distributes the rotational movement imparted to the disc over a larger area in terms of time and space.

A bending mold to carry out this process with at least two articulated mold frame sections that can be moved from an open position for receiving the flat disc into a closed position in which the frame corresponds to the curvature of the finished disc is characterized according to the invention by a for Horizontal inclined end shaping process and bending mold for bending
Panes of glass

Applicant:

Libbey-Owens-Ford Glass Company, Toledo,

Ohio (V. St. A.)

Representative:

Dipl.-Ing. H. Seiler,

Berlin 19, Oldenburgallee 10,

and Dipl.-Ing. H. Stehmann, Nuremberg 2,

Patent attorneys

Named as inventor:

Frank Lacob Carson,

Herbert Archie Leflet Jr., Toledo, Ohio

(V. St. A.)

Claimed priority:

V. St. v. America May 14, 1957 (658 982)

Rail on a movable mold section, the upper end of which in the open mold position determines the support height of the flat parts determined and the disc end supported at one corner, and by one Fixed boom, the top of which is also at the support height, and the end of the disc supported at its other corner, with the entire shaping surface in the closed mold position the end rail is above the top of the boom.

The features of the invention emerge from the description of exemplary embodiments in context with the drawing. It shows

F i g. 1 shows a three-dimensional representation of a pane of glass produced according to the method and the device has been bent according to the invention,

Fig. 2 is a plan view of a multiple section bending mold according to the invention in the closed position,

F i g. 3 is a side view of the FIG. 2 shape shown,

F i g. 4 shows a partial longitudinal section along the line 4-4 of FIG. 2,

F i g. 5 is a side view of the FIG. 2 when in the open position,

409 559/132

F i g. 6 is an end view of the FIG. 2, viewed from the right side,

F i g. 7 shows a three-dimensional representation of a two-piece glass unit, similar to that in FIG. 1,

F i g. 8 is a side view of a pair of molds used to make the one shown in FIG. 7 unit shown can be used, with the left shape in the closed position and the right shape in the open position is shown,

F i g. 9 is a plan view of the FIG. 8 shapes shown,

FIG. 10 shows the shape in the open position in an end view similar to FIG. 6,

FIG. 11 is an end view of the mold shown in FIG the right side of Fig. 8,

Fig. 12 is a partial plan view of a modified embodiment of the invention and

13 is a partial side view of the modified Embodiment of the invention.

Briefly stated, the invention relates to a method and an apparatus in which the end sections be rotated with respect to the central portion. As described in detail later a glass sheet to be bent is held above the shaping surface of one according to the invention constructed mold having transverse molding end rails supported by movable mold end portions be worn. According to the method according to the invention, the two ends of the glass sheet to be bent are on the uppermost parts of the rail end sections and also on new support means that are part of those described here represent improved shape, supported. After the central section of the glass panel is softened by heat is, it bends or descends towards the mold, the two ends of the disc gradually engage the angled forming end rails as they move upward are raised, and they twist with respect to the disk center portion and are of him bent upwards.

Reference is now made to the drawings, and in particular to FIG. 1. The curved disc 15, which is produced according to the method and the device of the invention, has a relatively large radius of curvature in its central section A , which merges into a greatly reduced radius B on the lower side at both ends of the disc. On the upper side of the disc at both ends, the curvature of the central section merges into an even more reduced radius C. Since the radii B and C are of different sizes, it is necessary to twist the disc end portions relative to the central portion during bending, which of course greatly complicates the bending of such a disc.

In the F i g. 2-6 there is shown a flexure device 16 constructed in accordance with the invention and a frame 17 as well as a bending mold 18 which is divided into sections and which is held by the frame is. The frame 17 is formed by a pair of spaced parallel side supports 19 and 20, those at their opposite ends by end brackets 21 and 22 to form a rigid frame are connected to each other. Pairs of protrude from the rack side supports near both ends Uprights 23 and 24 which are aligned with each other in the transverse direction and on different Side supports rest. As will be described later, these carriers serve to hold the mold 18 on the To hang up frame 17. Around the frame along a roller conveyor, as in most bending ovens is used to guide is a pair of spaced parallel guide rails 25 on the Underside of the side supports 19 and 20 attached.

The mold 18 has a central portion 26 and

ίο two aligned and opposite end sections 27 which are connected to the central section in such a way that they move from an open position (FIG. 5), in which a pane of glass 28 or a pair of panes of glass is received, to a closed position ( Fig. 3), in which the glass pane or the glass pane pair is bent into the predetermined curvature on the shaping surface of the mold.
The central portion 26 of the mold consists of a pair of spaced apart, substantially parallel shaping rails 29 and 30 which have a long, changing radius of curvature and are rigidly connected to one another by spaced cross members 31.

Each of the end portions 27 of the mold has a pair of spaced parallel forming side rails 32 and 33 of unequal curvature and length which are rigidly connected at their outer ends by means of a beveled end rail 34 which slopes downward from its point of connection with rail 32 and is at an angle to the transverse axis xx of the mold. Near their inner ends are the rails

32 and 33 are connected to one another by a cross member 35. Everyone wears near their outer ends Form end portion one on the forming rail

33 fixed locking device 36, of which a part 37 extends a limited distance to the outside and extends up over the high end of the rail 34, around the sheet of glass 28 in the transverse direction to hold precisely on the form.

The upper surfaces of the various shaping rails that contact the glass are carefully machined to the desired predetermined curvature to give end portion shaping surfaces 38 and to form a midsection forming surface 39.

It is often desirable to create a flat peripheral area in the curved disk that is under compressive stress and has an outline similar to that of the trimmed disc obtained from the Disk blank 28 is cut out. For this purpose, a shaped, Stress inducing rail 40 within the perimeter of the mold and slightly below the shaping surfaces 38 and 39 arranged; it has a central portion 41 that of the cross members 31 is held, and symmetrically adapted end portions 42, which are held by the respective cross members 35 and the cross rails 34 are carried.

When the sheet moves through the lehr, which is the case when the sheet of glass 38 does not must be tempered, cools the portion of the disc above the rail 40 because of the residual heat in the rail not as fast as neighboring sections, so the neighboring sections be placed under compressive stress. After leaving the cooling furnace, the disc can then be along a

5 6

The area slightly outside of the rail 40, in which form gradually, gradually cup the rail 34 she is under compressive stress, adjusted.

It is often desirable for the pane of glass between cut panes to be better able to support buttocks and its ends and thus to withstand pane pressure at the edge. 5 to prevent deflection, which, depending on the length of the panel to form the shape sections 26 and 27 together, undesirably connect the bending, as could generally accelerate it in the art. For this purpose, the inner ends of the end section side number of supports 54 are provided, which heat-resistant supports 32 and 33 are designed as yokes 43 with forked ends or ceramic disk support blocks 55 in order to have the adjacent io between them, which with On the underside of the disk at the point ends of the middle section rails 29 and 30, which are equipped with about a third of the note holders, which are at a distance of 44 from the ends with the girdle length engaging in the yokes 43. In the yokes 43 and the As in F i g. 5, the upper surface of a link 44 is viewed axially aligned bores in front of each block 55 in approximately the same plane, through which pins 45 are inserted 15 arranges as the connection points of the rails 32, thus completing the articulated connections 46 and 34 and also in the level which are set by them. Disc contact surface α of the arm 52 is defined. So that the shape of the open position of the each of the blocks 55 is in a holder 56 be-F i g. 5 in the closed position of FIG. 3, which is rotatable at one end of a lever arm, each of the mold end portions 27 is supported at 20 57 in such a manner that a pair of aligned, jogging movement of the block is provided for the struts 47 and 48 to self-align of which the tang with the lower surface of the glass pane, 47, on the side rail 32 and the other, 48, can follow. The other end of the lever arm 57 is attached to the side rail 33. In the ends welded to the crossbar 49 or on other of the struts 47 and 48, axially aligned bores are rigidly attached. As will be described, stanchions are provided in which a transverse move the blocks 55 in the disc support horizontal rod 49 is rigidly received, the position of which when the mold is opened (Fig. 5), and both ends extend outwards over the side rails them Stand with the underside of the glass sheet conti-32 and 33 extend beyond. Each of the two ends in natural contact when the mold begins to close to the rod 49 which is rotatable in the lower end of a 30, and they come to rest below the lever 50 which is hinged on its forming surface 38 to rest when the mold is upper End held on a short peg 51 their in F i g. 3 is closed position shown, which has taken from the corresponding uprights 23 and. 24 extends inward. Way of working

As in Fig. 5 is when the shape in FIG

When bending a sheet of glass according to the scrap 34 inclined at an angle to the horizontal, drive according to the invention and by means of a device disclosed here and it is therefore not possible, the end of the glass device is the shape in its Support open disk, the preferred position of FIG. 1 in the cold state. 5 moves by supporting the end sections horizontally so that when it is heated around its corresponding crossbars, the force of gravity is rotated perpendicular to the disk 49, the levers 50 acting about the pin plane. Fen 51 pivot to compensate for the increase in length of the mold. According to the invention, a pair of metallic elements are to be compensated for. A pane of glass 28 or pane supports or brackets 52 is then provided, which multiple panes are placed on the mold and positioned within the rail 34 when 45 is arranged so that a longitudinal edge against the detent in the mold is in the open position and pointing towards directions 37 is present. In this position the disc will rest rods 53 which extend upward and outward at each end of the in a substantially horizontal plane by the form of the frame end supports 21 and 22 in one of the high ends of the rail 34, through the disc angles. The upper contact surfaces α of the cantilever 52 and by the or disk contact surface α of the cantilever 52 are 50 support blocks 55 held. Because of the rigidity of the, when the mold is in the open position, a sheet of glass whose weight is on the rails is in the same plane as the high end 34 acts, the mold in its open position. Then the rail 34 at its connection point with the mold with the glass side rail 32 on it, and it has passed a series of slices through a bending furnace, the incisions b arranged at a distance so that the temperature is maintained, which is sufficient to soften the surface α the glass pane on a number of different panes. If the disc touches soft to who relatively closely adjacent points, the. begins, its stiffness decreases, and this prevents the formation of "quenching cracks" under the influence of heat and gravity, it sags towards the pane of glass. As shown in FIG. 10 downwards in the direction of the forming surface of FIG. 1, each end of the glass sheet 28 is formed in front of the 60 mold. At the same time, the outer ends of the bends begin to pivot about the pivot rods 49 over a very small, near and somewhat inner-form end sections 27 first up and inwardly half-corner located piece of the rail, which move and over a considerably larger, from the opposite - move inward on the lifters 50, the inwardly extending disc end edge d (FIG. 1) from the overlying disc corner being taken along and held linearly on the boom 52. As the disk sections e on the brackets 52 will be described later, this type of stay allows.

Support of the ends of the glass pane to be bent, Simultaneously with the movement of the end cap

that the disc during the closing movement of the cuts, the support blocks 55 lower with the aid of

7 8

maintaining contact with the pane of glass. It should be noted in this context that in

Because of their connection with the inwardly open position of the mold according to FIG

rotating rod 49. outer end of the rail 32 turns into a larger

When the mold end portions are at their descending height than the outer end of the rail 33.

5 However, the rail sections are dimensioned in such a way that,

tact at the high end of the rail 34 with the even when the disc section is in contact with it

Glass panel gradually lifted into linear contact with the high end of rail 34 first

Over approximately the entire width of the glass pane, the arc over which the rail 34 extends

increases. In particular, the originally flat moves occurs in such a way that the rail 33 with the glass-glass pane, when the high end of the rail 34 is brought into contact at about the same time

moves upwards and inwards, gradually with the becomes like the rail 32, eliminating any inclination

Rail 34 in contact and is moved by it upwards of the disc when making contact with it

raised, with the gradual contact immediate- rails to slide, reduced to a minimum

bar inside of the connection point of the rail 32.

and 34 begins and extends along the ends of the glass 15 after the twisted disc of the shaped disc has adapted in the direction of the shape in contact with the giving surface, the Locking device 37 moving longitudinal edge. Form passed through a cooling furnace in which the Since the rail 34 is slowly inclined to approximately room at an angle to the horizontal temperature of the pane, the corner of the pane of glass is lowered close to the temperature. While they are through The connection point of the rails 32 and 34 while the cooling furnace is moved, the areas of the glass trend the initial closing movement of the mold in the disk above the stress-applying rail maintained at a greater height than the corner of 40 and above the forming surface 36 of the mold Washer near the connection point of the rails is kept at a higher temperature than that 33 and 34. At the same time, the lowered central disc area between the shaping surface section of the disk that is covered by the area inside and the rail that applies tension, because these half of the blocks 55 is defined, due to the cooling because of the residual heat in them more slowly than Supporting action of these blocks essentially flat the pane of glass. This results in the or held horizontally. Thus, during the disc sections above the tension applying closing movement of the end sections of the mold on both trailing rails and the end of the shaping surface for tension the glass pane outside the blocks 55 a 30 tensions, while the pane area gradually increasing torsion is imposed, between being placed under compressive stress, because the rails 34 gradually with the glass sheet After cooling, the glass sheet is removed from the Taken at an angle to the horizontal or to the disc shape and overlaid in the correct pattern engage support level. an area trimmed to cover something

During the further closing of the mold, 35 is located outside the rail 40, the portion of the glass sheet that rests on the brackets 52, of these by the adjacent modification Section of rail that is narrow between the points

and h (Fig. 2) extends, gradually lifted off. Before the glass product shown in Fig. 7 corresponds

the contact with this portion of the rail 34 40 approximately that of FIG. 1 with the exception that

the corresponding pane of glass is divided into two parts that belong together through it at the center line

the boom is kept essentially flat, and each 58 and 59 is split.

The mold used to make these parts is in Moving the lower end of the rail 34 is illustrated by FIG. 8, with the right mold section the locking device 37 as well as by the friction 45 60 in the open position and the left mold contact of the glass with the extension arm 52 is in the closed position, section 61, changes. Thus, the gradual contact of the two forms are mounted on a frame 62, Rail 24 with the end of the glass pane ensures that it is constructed differently from that of the frame 17 perform. differs only in that the side rails 63 have been extended immediately before the final closing of the 50 and 64. The side supports are Mold sections and at about the same time as the lower at their ends by means of the end supports 65 and 66 End of the rail 34 with the glass pane in bounds.

In order to hold the molds 60 and 61, four faces of the blocks 55 are attached to the two sides of the side supports 63 and or slightly above the adjacent sections of the 55 64, with a aligning mold middle section rails 29 and 30, and with the pair of uprights 67 at one end of the frame and the last part of the mold movement, the corresponding pair of mutually aligned blocks 55 are inserted under the rails into the positions shown in FIG. 3-up stand 68 pulled at the other end of the frame indicated position. The exact dimensioning of the arranges is. Four shorter uprights rest on the lateral movement of these blocks is important as it is desirable to support 60 in aligned pairs 69 and worth that the sheet of glass cover all parts of the 70 that are spaced from their respective associated surface about the same Time removed uprights 67 and 68, namely within sets. them and parallel with spaced apart and with It is easily understood that when the blocks 55 the uprights 67 and 68 are arranged. At which the disk in the direction of the mold center section 65 underside of the side beams 63 and 64, the disk parts outside, a pair of lower of which is rails 71 attached to hold the frame in a downward direction to the upward loading roller conveyor as he move in most of the wegenden rail sections 32 and 33. Bending furnace is used.

1 168 Ö22

Forms 60 and 61 are identical with the exception that one is formed on the right and the other on the left. Both have the same distance from the center line bisecting the side beams 63 and 64. The same reference symbols are used below the same parts in the molds 60 and 61. The mold 60 or 61 has a lower movable Section 72 with a relatively flat curvature and an upper movable section

73 to each other by articulated connections

74 are connected, which are identical to the articulated connections 46, so as to be of an open Position as it occupies the mold 60 to be able to be moved into a closed position, such as it takes the form 61.

The lower mold portion 72 has a pair of forming rails 75 and 76 which are parallel and in Distance from each other between their ends by the cross bars 77 and at their lower end taken, the upper end of which is rotatably supported on a pin 97 extending from the uprights 68 extends inward.

Similar to the end rail 34 of the mold section 27, the end rail 84 of the upper Fprmabschnittes 73 is inclined at an angle to the horizontal in the open position of the mold and extends downwards and outwards towards the end near the locking device 86, so that only the high end the rail 34 is in engagement therewith prior to the bending of the disc. In order to support the portion of the disc not held by the high end of the rail 34, a bracket 98, approximately similar to the bracket 52, is provided which has a plurality of rods 99 which extend upwardly from the end rail of the frame 62 and at their upper ones Ends of a plate 100 carry, which has a flat disc contact surface b, which performs the same function as the disc contact

an end rail 78 is held which has a pair of 20 surfaces a of the boom 52.

carries spaced-apart stops 79 in order to hold the lower end of a pane of glass 80 in position, when it is placed on the mold. To fix the pane of glass in the lateral direction is a Stop 81 attached to rail 76. «5

The upper or end portion 73 of the mold is similar to the mold end portion 27 and has a pair of spaced parallel shaping rails 82 and 83 of unequal curvature and length, at its outer end by means of a downwardly sloping sloping end rail 84 and at its inner ends by means of a cross member 85 are rigidly connected. In order to fix the glass pane 80 on the upper mold section in the lateral direction, a locking device 86 is attached to the outer surface of the shaping rail 83 near its connection point with the rail 84. As shown on the mold 61 on the left-hand side of FIGS. 8 and 9, the shaping rails 75, 76, 78, 82, 83 and 84 cooperate in the closed mold position to form a substantially continuous shaping surface 87 with their upper surfaces form. Within the perimeter of the shaping surface and at a distance below that - for the purpose of supporting the glass sheet 80 between its ends when it lies on the mold, spaced lifting devices are provided which have a pair of base members 101 which are rigid at their lower end are connected to the transverse pivot rod 94 and carry on their other ends a disc contact member in the form of a block 102 which operates in the same way as the blocks 55. _;

As shown in Figure 8, in the open position of the mold, the upper edge of the rail 78, the upper surface of the blocks 102, the high end of the rail 84 and the disc contact surface b of the plate 100 lie in a common inclined plane. All of the elements mentioned serve to support the glass pane in the correct position for bending on the mold when the pane and the mold are passed through a bending furnace. As it passes through the oven and after it has softened, the disc surface rotates. 'Formendabsctaiitt 73 upwards, at the same time the blocks 102 lower the glass pane 80 in the direction of the shaping surface of the mold, and during the last part of the mold movement the blocks are lowered

From there, a tension generating rail 88 is attached- 45 lowered to the forming surface of the mold as it is which consists of the parts 89 and 90, which in the form on the left side of FIG. 8 is shown. are held by the corresponding mold sections 72 and 73.

As already mentioned, the shaped sections 72 and 73 are shaped in this way by the articulated connections 74 movably interconnected that they move from an open to a closed position can. In order to keep the mold sections corresponding to such a movement, the lower mold section is 72 is provided with a cross bar 77 which 55 is rigidly attached to the underside of the rails 75 and 76 is. The two ends of the rod 91 protrude beyond the rails 75 and 76 and are rotatable received in the lower end of a lever 92, the upper end of which is rotatable on a pin 60 boom 103 only an approximately punctiform Be-93 that sits apart from each of the relatively small foods of the pane of glass, and for this reason NEN stand 70 extends inward. The upper section 73 is similarly suspended by means of a Crossbar 94, which is rigidly attached to the mold section with the aid of struts 95, which are held by the slide 65 82 and 83 hang down. The two ends of the rod 94 extend over the rails 82 and 83 and can be rotated in a lever 96

A modified embodiment of the cantilever device is shown in Figures 12 and 13 and can be used in conjunction with a mold for bending a full size sheet of glass as well as with a mold for bending half glass sheets. The cantilever 103 has a single rod-like member, the lower end of which is connected to the frame end rail and the upper end c is at the same level as the disc contact surfaces of the cantilevers 52 and 98 and is rounded to create a curved disc contact surface. Compared to the arms 52 and 98, the

it is normally only used if the disc is not raised to a much higher level during bending than the normal temperature is heated.

Claims (2)

Claims: method for bending glass panes, whose end sections also have a twist - • «ff SQf * · 409 559/132 to learn compared to the rest of the disc part, characterized in that each End portion while being held with a corner at the level of the initial support of the other corner is progressively brought into contact with its shaping rail. 2. Bending mold for performing the method according to claim 1 with at least two articulated interconnected mold frame sections, which can be moved from an open position for receiving the flat disc into a closed position in which the frame corresponds to the curvature of the finished disc, characterized by a Forming end rail (34 or 84) inclined to the horizontal on a movable mold section (27 or 73), the upper end of which in the open mold position determines the support height of the flat pane (28 or 80) and supports the end of the pane at a corner, and by a fixed bracket (52 or 98 or 103), the top side (α, c) of which is also at the support level and supports the end of the pane at its other corner, with the entire shaping surface (38) in the closed position the _{a5 end} rail is above the top of the jib. 3. bending form according to claim 2, characterized in that the supporting one in the projection Upper side of the jib (er, c) with the open form on the inside of the end rail (34 resp. 84) and is on the outside of the closed mold. 4. bending mold according to claim 2 or 3, characterized in that the end rail (34 or 84) is at an angle to the transverse axis (xx) of the mold. 5. bending form according to claims 2 to 4, characterized by a disk fixing device (36 or 86) attached to the lower end of the inclined end rail (34 or 84), which with an extension (37) protrudes above the support height. 6. bending form according to claims 2 to 5, characterized in that the upper side (a) of the bracket has incisions (b) so that it is in contact with the glass sheet at a number of adjacent points. 7. bending form according to claims 2 to 6 with a central section and two articulated thereon End sections, characterized in that each end section (27) has an inclined end rail (34) is equipped, which cooperates with a fixed boom (52). 8. bending form according to claims 2 to 7, characterized by intermediate supports (55) in the area of the mold section (26 or 72) adjoining the end section (27 or 73), the are held so that they are when closing the mold from a position in support height in move a position below the shaping surface (38, 39). 9. bending form according to claims 2 to 8, characterized in that the end portion (27 or 73) from the inclined end rail (34 or 84) and two rigidly connected, parallel Side rails (32, 33 or 82, 83), with the flat washer (28 or 80) at the connection point the one side rail (32 or 82) is supported by the upper end of the end rail will. 10. bending form according to claims 2 to 9, characterized in that the boom (103) consists of a single rod, the top (c) of which the disc is essentially in one Point. Considered publications:
French Patent No. 1043 576;
British Patent No. 773,463. For this purpose 2 sheets of drawings 409 559/132 4.64 © Bundesdruckerei Berlin