Fluid handling – With indicator – register – recorder – alarm or inspection means – Position or extent of motion indicator
Reexamination Certificate
2007-04-24
2007-04-24
Chambers, A. Michael (Department: 3753)
Fluid handling
With indicator, register, recorder, alarm or inspection means
Position or extent of motion indicator
C137S553000, C251S030010, C251S285000, C251S366000
Reexamination Certificate
active
11338695
ABSTRACT:
In a switching valve containing a valve member for opening and closing a valve seat and a piston for driving the valve member by the action of a pilot fluid pressure inside a valve housing, a magnet for positional detection is attached to the piston, two sensor attachment grooves extending in the direction of the axial line L of the switching valve and having different groove lengths in accordance with the operational position are formed in parallel on the side face of the valve housing, and magnetic sensors are attached at locations on the side of the innermost end wall in the attachment grooves.
REFERENCES:
patent: 4004258 (1977-01-01), Arnold
patent: 4341241 (1982-07-01), Baker
patent: 4478345 (1984-10-01), Edinger
patent: 5329956 (1994-07-01), Marriott et al.
patent: 6481460 (2002-11-01), Fukano et al.
patent: 1 195 528 (2002-04-01), None
patent: 2001-193845 (2001-07-01), None
patent: 2001-193846 (2001-07-01), None
Hayashi Bunya
Miyazoe Shinji
Yoshimura Shin-ichi
Chambers A. Michael
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
SMC Corporation
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