Plastic article or earthenware shaping or treating: apparatus – Control means responsive to or actuated by means sensing or... – Molding pressure control means responsive to pressure at...
Patent
1985-01-31
1986-09-02
Flint, Jr., J. Howard
Plastic article or earthenware shaping or treating: apparatus
Control means responsive to or actuated by means sensing or...
Molding pressure control means responsive to pressure at...
425432, B28B 1700
Patent
active
046093389
ABSTRACT:
A fluid operated press having opposed first and second fluid chambers is employed for compressing a mixture of desired brick ingredients in a mold. Pressurized fluid, preferably hydraulic oil, is first delivered to the first fluid chamber of the press to cause the same to exert a prescribed pressure on the mixture. Then, with this prescribed pressure maintained, the pressurized fluid is directed alternately into the first and second fluid chambers at rapid intervals, with the result that the press imparts vibratory motion to the mixture being held under pressure. In a preferred embodiment, the selective delivery of the pressurized fluid to the fluid chambers of the press is controlled by a servomechanism, constantly comparing a reference pressure signal with an actual pressure signal representative of the actual pressure being exerted by the press and actuating a servovalve so as to make the difference between the reference and actual pressure signals zero.
REFERENCES:
patent: 2959900 (1960-11-01), Wallett
patent: 4035124 (1977-07-01), Balhorn
patent: 4235580 (1980-11-01), Springs et al.
patent: 4238177 (1980-12-01), Erile et al.
patent: 4244682 (1981-01-01), Willingham
Nakamori Yoshio
Nishida Shinji
Otsuka Takashi
Sato Mitsukuni
Flint, Jr. J. Howard
Shinagawa Shirorenga Kabushiki Kaisha
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