Presses – Plural presses – Stacked boxes or plates
Patent
1980-01-31
1982-08-10
Feldman, Peter
Presses
Plural presses
Stacked boxes or plates
100219, 100 48, 210230, B30B 700, B30B 1510
Patent
active
043432352
ABSTRACT:
A plate type filter press, which is opened and closed by at least one hydraulic piston-and-cylinder unit, has a mechanical lock to lock the press in the closed position so that it is not necessary to maintain a high hydraulic pressure to keep the press closed. The mechanical lock may be a set of claws on the hydraulic cylinder to co-operate with a locking ring on the piston rod, with a hydraulic lock cylinder to retract the claws for unlocking, or a lock gate that is introduced into or retracted out of the path of a lock collar on the piston rod by operation of a lock cylinder. The press is first closed with a predetermined high hydraulic pressure that compresses the filter press pack sufficiently for easy movement of the mechanical lock into locking position, and then operation of a lock limit switch automatically stops the hydraulic pump and energizes a bleed valve to reduce the closing pressure to a level at which the press pack compression is relaxed enough to give firm lock engagement.
REFERENCES:
patent: 942173 (1909-12-01), Heller
patent: 3667891 (1972-06-01), Gelin
patent: 4230572 (1980-10-01), Hirs
Feldman Peter
Johnson-Progress, Ltd.
Rose Howard L.
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