Supporting chassis for a working machine, such as a hydraulic shovel

Supporting chassis for a working machine such as a hydraulic shovel, comprising two longitudinal side-members, preferably two lateral side-members, each side-member being essentially constituted by a metal sheet which is bent in such a way that its cross-section presents a downward oriented concavity, and by a plate closing off the bent metal sheet, the lower edges of said metal sheet being secured to said plate;

• the improvement wherein said plate is monobloc and obtained by rolling and comprises a central zone of predetermined thickness,which is flanked on each one of its sides with a rim of material of thickness substantially greater than the predetermined thickness, wherein the lower edges of the said metal sheet are in contact with the upper faces of the thick rims bordering longitudinally the closing plate and wherein the two longitudinal rims are joined together in the central zone of the closing plate, thereby conferring to the inner face of said plate a downward oriented concavity permitting at least the partial housing of guiding runners of track supports of a track chassis inside the space provided by the said concavity of the closing plate and further permitting direct fastening of supports of the guiding runners on said closing plate.

Supporting chassis for a working machine such as a hydraulic shovel, comprising two longitudinal side-members, preferably two lateral side-members, each side-member being essentially constituted by a metal sheet which is bent in such a way that its cross-section presents a downward oriented concavity, and by a plate closing off the bent metal sheet, the lower edges of said metal sheet being secured to said plate;

• the improvement wherein said plate is monobloc and obtained by rolling and comprises a central zone of predetermined thickness, which is flanked on each one of its sides with a rim of material of thickness substantially greater than the predetermined thickness, wherein the lower edges of the said metal sheet are in contact with the upper faces of the thick rims bordering longitudinally the closing plate and are welded to the closing plate, and wherein the two longitudinal rims are joined together in the central zone of the closing plate, thereby conferring to the inner face of said plate a downward oriented concavity permitting at least the partial housing of guiding runners and of track supports of a track consists inside the space provided by the said concavity of the closing plate and further permitting direct fastening of supports of the guiding runners on said closing plate.