| 摘要 |
In the case of arranging hydraulic hoses inside a boom, to make it possible for the hydraulic hoses to smoothly move along part of a hose introduction hole when the boom is vertically swung. On the inner surface side of the upper wall of the body part, an enlarged opening part gradually extending upward from the fore end side toward a forked side is formed, whereas on the outer surface side of the upper surface of the body part, a swelling part extending upward from the fore end side toward the forked side so as to correspond to the upper wall inner surface side, and skirt parts gradually extending downward from the lateral center of the top part of the swelling part toward the upper surfaces of the left and right leg parts are formed. |
| 主权项 |
1. A boom for a working machine, the boom comprising a forked base support of which a base end side is pivotally supported by a machine body and a fore end side is connected with a boom main body, wherein
the base support comprises: a body part that has a hose introduction hole for inserting a hydraulic hose from the machine body into the boom main body; and a left and right pair of leg parts that are extended in a forked shape from the body part toward the machine body, and swingably pivotally supported on a machine body side, wherein the body part includes: sidewalls that are connected with the left and right leg parts; an upper wall that connects between upper parts of the left and right sidewalls; and a lower wall that connects between lower parts of the left and right sidewalls, and a part surrounded by the left and right sidewalls, the upper wall, and the lower wall is configured as a hose introduction hole, and on an inner surface side of the upper wall of the body part, an enlarged opening part that gradually extends upward from the fore end side toward a forked side is formed, and on an outer surface side of the upper wall of the body part, a swelling part that extends upward from the fore end side toward the forked side so as to correspond to the inner surface side of the upper wall, and skirt parts that gradually extend downward from a lateral center of a top part of the swelling part toward upper surfaces of the left and right leg parts are formed. |
