Patent GB-371795-A (GB)
Title: Improvements relating to a method of and apparatus for treating the edges of laminated glass
IPC: B32B17/10
Filed: 1930-10-20
Abstract: 371,795. Compound glass. GREGG, B. L., Forest Hill Gardens, New York, U.S.A.-(Assignee of Campbell, F. N. and Myatt, J. ; 424, High Street, East Haven, and Gregg, F. M.; Marlin Arms Building, New Haven, both in Connecticut, U.S.A.) Oct. 20, 1930, No. 31390. Convention date, March 13. Void [Published under Sect. 91 of the Acts]. Addition to 355,541. [Class 140.] Apparatus for burning away the narrow strip of binding material from between the edges of laminated glass sheets, as described in the parent Specification, comprises a heated rotatable disc or discs adapted to engage at an angle with the sides of adjacent laminations. A thin sheet metal disc 29, Fig. 2, is secured between two members 48, 49, which are heat conductors but electrical insulators and which are clamped between members 50, 51 which are heat and electrical insulators. Heating coils 31, 31<1> are mounted between the members 48, 50 and 49, 51 and the whole assembly is clamped on a shaft 30 between a collar 36 and a nut 37. Current is supplied to the heating coils 31, 31<1> by spring-controlled brushes 32, 321 contacting with slip rings 33, 331, mounted on a stationary insulator 35 and connected to leading-in wires 34, 34<1>. The disc may also be heated by flames, as in Fig. 3. The disc 29 may be mounted in a plane not at right-angles to the axis of the shaft 30, so that the disc, rotates with an oscillating motion. Alternately a pair of discs 38, 38<1>, Fig. 3, may be mounted on shafts 39, 40 the axes of which are inclined at an angle. After forming the groove by means of the rotating disc 11, Fig. 1, loose or charred particles are removed therefrom by rotating wire brushes 12, 14, 15 supplied with steam, water, or other solvent pipes 13, 16. The solvents are then removed by a brush 18 and a hot air blast from a nozzle 19 and sealing layers 20, 22 are applied by means of receptacles 21, 23 provided with plungers operated by levers 45 to force the composition through heated nozzles into the groove. Excess of the sealing composition is removed by a scraper 24, after which the sealed edge is polished by a buffing wheel 25. Where a single sealing layer is used mixtures of pitch, asphalt or rubber with paraffin or glycerine, or sodium silicate or thread impregnated with moisture-proof material or a rubber band, vulcanized before or after application, may be used. Where a double or triple seal is used, the inner layer is preferably made of materials which remain plastic at low temperatures and may comprise mixtures of viscous materials such as grease, glycerine, paraffin, linseed oil, and castor oil with whiting, terra alba, litharge, rubber, asphalt or kieselguhr. The outer layer preferably consists of materials which remain hard at comparatively high temperatures and may comprise any of the above-mentioned compositions containing smaller quantities of the viscous fluids or oils, or thread or fabric strip impregnated with oil or vulcanized in rubber or a rubber band. A suitable combination is block paraffin for the inner layer and a mixture of asphalt and besswax for the outer layer.