Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Positioning of a mold part to form a cavity or controlling...
Patent
1993-07-07
1995-05-23
Vargot, Mathieu D.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Positioning of a mold part to form a cavity or controlling...
264315, 264326, 425 29, 425136, 425162, 425173, B29C 3504
Patent
active
054179009
ABSTRACT:
A curing press for tires or other curable articles, has a fluid inlet line for supplying curing fluid into an inflatable elastomeric bladder mounted within the press cavity for curing a green tire or article in the cavity. The spent curing fluid is removed from the bladder after a curing operation by a pump through an exhaust line. A venturi ejector in the exhaust line causes a vacuum to be created within the bladder as the fluid is being removed during an unload cycle. A vacuum sensor is connected to the exhaust line and if a predetermined vacuum strength is not reached within a predetermined time, which indicates that leak exists, appropriate control circuitry is actuated to prevent loading of the next green tire or article into the press. The invention also incorporates the method for detecting a leak by measuring the strength of the vacuum created upon removal of the spent curing fluid after each curing cycle.
REFERENCES:
patent: 3632712 (1972-01-01), Miller
patent: 3859015 (1975-01-01), O'Brien, Jr.
patent: 3942922 (1976-03-01), Cole et al.
patent: 4222721 (1980-09-01), Gado
patent: 4502857 (1985-03-01), Hinks
patent: 4721590 (1988-01-01), Trapp
patent: 4744931 (1988-05-01), Trapp
patent: 5238643 (1993-08-01), Kobayashi
Bridgestone/Firestone Inc.
Thomas David A.
Vargot Mathieu D.
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