Patent ID: 6019569
Filing Date: 2000-02-01
Classification: E02F

Abstract:
An excavation machine which comprises:a base carrier, and an upper rotary body mounted on said base carrier and having a driver's seat and a front working mechanism in positions in proximity with each other, said front working mechanism including a boom for lifting working equipment up and down, an arm pivotally operatively connected to a fore end of said boom, and a bucket pivotally operatively supported on a fore end of said arm, said boom of said front working mechanism including a lower boom pivotally supported on a boom support bracket provided on said upper rotary body at a position alongside said driver's seat and an upper boom pivotally connected to a fore end of said lower boom, and a boom operating hydraulic cylinder connected between said lower boom and said boom support bracket; andan asymmetrical single cross-link boom assembly comprising a single cross-link connected between said support bracket and said upper boom along a lateral side of said boom away from said driver's seat, said boom operating cylinder being located at a position shifted aside from an axial centerline of said lower boom by a predetermined distance in a direction away from said cross-link to thereby offset a lateral bending load imposed on said boom by said single cross-link.