Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2006-06-27
2006-06-27
Rivell, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C251S050000
Reexamination Certificate
active
07066206
ABSTRACT:
A damper device for a hydraulic control valve includes: a valve body; a damper oil chamber to which one end surface of a spool is faced; an oil reservoir chamber which is adjacent to the damper oil chamber with a partition wall therebetween; and an orifice provided in the partition wall to allow an upper portion of the damper oil chamber to communicate with the oil reservoir chamber. The damper oil chamber and the oil reservoir chamber are disposed in the valve body. The oil reservoir chamber is constructed by closing an opening of a recessed portion formed on an undersurface of the valve body with a top surface of the support member for supporting the valve body. In order to work the orifice in the partition wall by drilling from the opening of the recessed portion, an axis of the orifice is disposed to pass through the opening of the recessed portion. Thus, it is possible to eliminate need for post-treatment after working the orifice, thereby reducing the cost.
REFERENCES:
patent: 2910089 (1959-10-01), Yarber
patent: 4669504 (1987-06-01), Fujitsugu et al.
patent: 6269827 (2001-08-01), Potter
patent: 6435213 (2002-08-01), Lou
patent: 6907901 (2005-06-01), Holmes et al.
patent: 05-306782 (1993-11-01), None
patent: 2002-130513 (2002-05-01), None
patent: 2004-360889 (2004-12-01), None
Ino Tohru
Noda Satoshi
Ryuen Shigeto
Watanabe Hidetoshi
Arent & Fox PLLC
Keihin Corporation
Rivell John
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