| US 7,549,241 B2 | ||
| Hydraulic control device for loader | ||
| Kensuke Ioku, Kobe (Japan); Jun Nakano, Kobe (Japan); and Yasunori Hatanaka, Kobe (Japan) | ||
| Assigned to Nabtesco Corporation, Tokyo (Japan) | ||
| Filed on Jul. 07, 2006, as Appl. No. 11/483,421. | ||
| Claims priority of application No. 2005-199131 (JP), filed on Jul. 07, 2005; application No. 2005-199132 (JP), filed on Jul. 07, 2005; and application No. 2006-150048 (JP), filed on May 30, 2006. | ||
| Prior Publication US 2007/0006491 A1, Jan. 11, 2007 | ||
| Int. Cl. E02F 5/02 (2006.01); F15B 13/02 (2006.01) | ||
| U.S. Cl. 37—348 [60/421; 60/422] | 12 Claims |
| 1. A hydraulic control device for a loader, comprising:
an arm direction changeover valve that controls a supply of pressure oil to an arm cylinder;
a bucket direction changeover valve that controls a supply of pressure oil to a bucket cylinder;
a first pilot check valve provided between a first chamber of the arm cylinder and a tank; and
a second pilot check valve provided between a second chamber of the arm cylinder and the tank;
the hydraulic control device for a loader bringing an arm into a floating state by opening the first pilot check valve and
the second pilot check valve; wherein
the improvement comprises:
an arm block in which the arm direction changeover valve is provided;
a first block in which one of the first pilot check valve and the second pilot check valve is provided; and
a second block in which the other one of the first pilot check valve and the second pilot check valve is provided; wherein
the three blocks, namely, the arm block, the first block, and the second block are arranged side by side; and wherein
the first block and the second block are arranged to be contiguous to each other.
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