Presses – Reciprocating press construction – Fluid pressure actuation
Reexamination Certificate
1999-06-29
2001-03-06
Vo, Peter (Department: 3721)
Presses
Reciprocating press construction
Fluid pressure actuation
C100S269010, C100S269200, C092S177000, C092S255000, C277S434000
Reexamination Certificate
active
06196125
ABSTRACT:
FIELD OF INVENTION
The present invention relates to a hydraulic press, and more specifically a hydraulic press provided with a preferably rectangular hydraulic cylinder unit. The rectangular hydraulic cylinder is suitable for pressing rectangular objects. The hydraulic press according to the invention also comprises a flexible frame consisting of parallel, flat pillars. A frame of this kind is known from our co-pending Swedish Patent Application No. 9602349-4, filed on Jun. 14, 1996. The invention relates particularly to an advantageous scaling arrangement, solving the problem of leakage in rectangular hydraulic cylinders.
STATE OF THE ART
Rectangular cylinder units are known, as such, in various contexts, e.g. for presses and combustion engines.
It is not previously known, however, to utilise rectangular hydraulic cylinders in hydraulic presses comprising a frame constructed from pillar modules. The pillars support the hydraulic cylinder from two opposite sides.
SUMMARY OF THE INVENTION
The present invention thus provides a press comprising a hydraulic cylinder unit with a cylinder barrel and a piston. The unit has a cross-section shape adapted to the product to be pressed. According to the invention, the press comprises a frame having parallel, flat pillars, surrounding the hydraulic cylinder unit on two opposite sides.
A seal housing is arranged on the hydraulically pressurised side of the piston, in such a manner as to press the seal housing against the internal surface of the cylinder barrel, to provide adequate sealing.
The invention is specified in detail by the accompanying claims.
REFERENCES:
patent: 576616 (1897-02-01), Roseman
patent: 2793089 (1957-05-01), Anderson
patent: 4069747 (1978-01-01), Forry et al.
patent: 5323698 (1994-06-01), Prevost
patent: 5601017 (1997-02-01), Schoen
patent: 58-218396 (1983-12-01), None
patent: 61-74800 (1986-04-01), None
EP Technology AB
Huynh Louis
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Vo Peter
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