Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Reexamination Certificate
2005-11-08
2011-10-25
Lazo, Thomas E (Department: 3745)
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
C091S445000
Reexamination Certificate
active
08042451
ABSTRACT:
A hydraulic control apparatus1includes a switch valve11, an adjustment valve12, and a valve control device13. The adjustment valve12has a fluid chamber15, a valve body14, and a back pressure chamber17. A restrictor is formed between the valve body14and a wall defining the fluid chamber15and connects the cylinder line32to the switch valve line33. The opening degree of the restrictor changes in correspondence with movement of the valve body14. When the switch valve11is located at a neutral position or a supply position, the valve control device13applies the fluid pressure in the cylinder line32to the back pressure chamber17. When the switch valve11is located at a drainage position, the valve control device13applies a pilot pressure lower than the fluid pressure in the cylinder line32to the back pressure chamber17.
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International Search Report for corresponding International PCT application No. PCT/JP2005/020776, dated Feb. 9, 2006.
Communication Pursuant to Article 94(3) EPC for application No. 05 803 468.7-1252, dated Dec. 7, 2010.
Matsuzaki Takeharu
Nakajima Shigeto
Kabushiki Kaisha Toyota Jidoshokki
Lazo Thomas E
Locke Lord Bissell & Liddell LLP
Nishina Industrial Co. Ltd.
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