| US 7,520,713 B2 | ||
| Boom assembly | ||
| Ryoichi Nishi, Kawachinagano (Japan); Naoki Onishi, Kawachinagano (Japan); Arinobu Ishida, Sakai (Japan); Shusaku Yamaguchi, Sennan (Japan); and Kosuke Oyama, Sakai (Japan) | ||
| Assigned to Kubota Corporation, Osaka (Japan) | ||
| Filed on Sep. 11, 2006, as Appl. No. 11/519,216. | ||
| Claims priority of application No. 2006-086356 (JP), filed on Mar. 27, 2006; and application No. 2006-092022 (JP), filed on Mar. 29, 2006. | ||
| Prior Publication US 2007/0224027 A1, Sep. 27, 2007 | ||
| Int. Cl. B66F 9/00 (2006.01) | ||
| U.S. Cl. 414—722 [29/891; 52/111] | 7 Claims |
| 1. A boom assembly bent at the center in a longitudinal direction so as to form a round shape protruding upward when seen
from the side, comprising;
a front boom sub assembly, said front boom sub assembly constituting the front of the center in the longitudinal direction
of said boom assembly; and
a rear boom sub assembly, said rear boom sub assembly constituting the rear of the center in the longitudinal direction of
said boom assembly,
wherein said front boom sub assembly and said rear boom sub assembly are symmetric to each other when seen from the side,
and portions from the midway positions in the longitudinal direction of said front boom sub assembly and said rear boom sub
assembly to the center in the longitudinal direction of the boom assembly have upper surfaces of arc shape protruding upward
when seen from the side, and portions from the middles in the longitudinal direction of said front boom sub assembly and said
rear boom sub assembly to ends in the longitudinal direction of the boom assembly have upper surfaces of linear shape when
seen from the side.
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