Glass manufacturing – Processes – Reshaping or surface deformation of glass preform
Patent
1978-12-11
1980-05-13
Kellogg, Arthur D.
Glass manufacturing
Processes
Reshaping or surface deformation of glass preform
65107, 65114, 65268, 65273, C03B 2302
Patent
active
042026814
ABSTRACT:
A system (10) and method disclosed for use in bending glass incorporate a vacuum holder (12) having a surface (28) with spaced openings (32) in which a vacuum is drawn to support a heated sheet of glass (G) and in which pressurized gas is subsequently supplied to force the glass sheet away from the holder surface. In one embodiment, operation of a control damper (24) initially communicates a vacuum blower (20) with the holder and subsequently communicates a positive pressure air blower (22) therewith to first draw the vacuum and then supply the pressurized air to the openings in the surface which is disclosed facing downwardly. During an intermediate step, the damper is positioned so that a reduced vacuum is drawn to prevent deformation of the heated glass sheet at the spaced openings in the holder surface. In an alternative embodiment, a gas jet pump (90) is used to produce the positive and vacuum pressures used in the practice of the invention. The gas jet pump produces the desired pressure condition by developing a large quantity, secondary flow of gas in response to a primary flow of gas. The direction of the secondary flow can be selectively controlled to develop either a positive pressure or vacuum pressure.
REFERENCES:
patent: 3181563 (1965-05-01), Giffen
patent: 3468645 (1969-09-01), McMaster et al.
patent: 3778244 (1973-12-01), Nedelec et al.
patent: 3782916 (1974-01-01), Powell et al.
patent: 4059426 (1977-11-01), Starr
patent: 4059427 (1977-11-01), Starr et al.
patent: 4092141 (1978-05-01), Frank et al.
McMaster Harold A.
Nitschke John S.
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