GLASS BENDING MOLD

Abstract: Glass bending mold, which consists of two or more vertical template plates (6) mounted in frame of the oven, bars (8) and fixtures (9) for exact positioning of template plates (6) and over the template plates laid pipes (7) and means for moving the pipes (7). Template plates defining form of glass being bent have in their upper edge holes (15), which holes are affording to each of pipes (7) exact supported position and which holes keep pipes (7) apart from each other. At least other ends of pipes (7) are led out of the oven (1) through special plates (4). Pipes (7) are alternated back and forth with lever system (10, 11, 12) while glass (14) is lowered over pipes.

Description: GLASS BENDING MOLD The present invention relates to the glass bending mold , which is located in the oven , which is heated for softening glass sheets so , that it as laid in horizontal position over the mold can with assistance of gravity be bend against the mold and be formed in curvature according the mold. The mold is formed about side by side located-pipe-like members , which are rotated alternately back and forth. In US-patent publication n:o 2,223,124 is presented a method for bending glass sheets , in which in the bending in horizon¬ tal position being glass sheet is on in the beginning horizon¬ tal runway ; rolls are separately supported and spaced apart from each other. When glass is heated these rolls are lowered and while lowering the rolls are defining desired curvature to which the glass sheet is to be bent. Different ways to guide lowering rolls are giving different curvatures in bending. To prevent soft glass sheet to bend down between horizontal rolls , runway is rotated alternately back and forth during heating and bending and glass sheet is moving back and forth along the runway. In construction presented in US-publication n:o 2,223,124 is difficulty in guiding of lowering rolls , which is a difficult operation and has to be done inside the bending oven. Because of construction of roller runway it is also impossible in any simple way to make size of the mold smaller in case of bending smaller sizes of glass sheets. Rotating device is making roller runway even more complex. Mold system according to present invention is providing a significant improvement in earlier mentioned difficulties. Characteristics of present invention are presented in claim 1. As a major benefit of device according to preβent invention can be mentioned , that pipe-like elements can easily be rotated back and forth because of light construction of pipe- like elements. In following the invention will be examined more closely referring to drawings enclosed , in which Fig. 1 shows bending mold , which is located in the oven. Fig. 2 shows form plate defining bending form. In fig. 1 is shown with insulator (16) insulated with wheels equipped lower part (1) of the glass bending oven , upper part of the oven is laid on lower part's top on joint surface (3). Glass bending mold consist horizontal pipes (7) , which are laid on template plates (6) . Template plates are in vertical position and they are laid between fixtures (9) mounted in the frame of the mold , fixtures are forming in between them precise plane , bar (8) is positioning template plates in perpendicular direction. Ends of pipes (7) are led out of the oven through special plate (4) . This plate is equipped with lift eyes (5) . Ends of pipes (7) , which are led out of the oven are equipped with levers (10) , which are joined together with members (11) located between joint points. Device (13) is causing movement of the levers (10) back and forth with assistance of rod (12). In fig. 2 is shown a form plate (6) and over t laying mold pipe (7), which is located in one of formed pipe holes (15) , which holes are constructed to hold each pipe (7) in its position during oscillating back and forth , which is caused with levers to pipe. Purpose of back and forth oscillating movement is to prevent marks in lower surface of glass (14) possibly caused by line-like touching in lower surface of glass , when glass has lowered over the pipes and chilling is starting. Most advantageous movement of the glass is about 2- 20 mm. Movement is started , when chilling of the glass is so far , that mold is no more causing marks in the surface of the glass. Different kinds of bending forms can be made with same mold pipes (7) , different forms just need change of template plates (6) according to form desired. Hole (17) in lower edge of template plate is guiding template plates in exact mutual position. Especially should be observed , that template plates can be replaced with balks carried in the ends , which balks have formed surfaces and pipes (7) are supported and separated from each other with middle members. While only one embodiment of the present invention has been described in detail herein , various modifications and changes may be applied without departing from the scope of the inventi¬ on.

Claims: CLAIMS 1. Glass bending mold , which consist two or more vertical template plates (6) mounted in frame of the oven , bars (8) and fixtures (9) for exact positioning of template plates (6) and over the template plates laid pipes (7) and means for moving the pipes (7) , template plates defining form of glass being bend have in their upper edge holes (15) , which holes are affording to each of pipes (7) exact supported position and which holes keep pipes (7) apart from each other c h a r a c t e r i z e d in , that at least other ends of pipes (7) are led out of the oven (1) through special plates (4) and pipes (7) are alternated back and forth with lever system (10,11,12) while glass (14) is lowered over pipes. 2. Glass bending mold according to claim 1 c h a r a c t e¬ r i z e d in , that with lever system (10,11) caused alterna¬ ting movement back and forth is moving the glass (14) at the most 20 mm. 3. Glass bending mold according to claims 1 and 2 c h a¬ r a c t e r i z e d in , that lever system (10,11) and device (13) causing movement of the levers (10) are located out of the oven. 4. Glass bending mold according to claims 1-3 c h a r a c¬ t e r i z e d in , that special plate (4) is heat insulated and can be removed from the oven with mold pipes (7) .

Inventors: REUNAMAEKI PAULI TAPANI, REUNAMAEKI, PAULI, TAPANI
Applicants: GLAMEC OY
Application year: 1989
Main classification: C03B23
IPC codes: C03B23