Patent ID: 11866101
Assignee: KUBOTA CORPORATION
Field: Civil engineering (Other fields)
Classification: CPC B  E | IPC B  E

Claim 4:
5. A working machine, comprising:
a traveling frame provided with a top plate having an opening;
a swivel base arranged on the traveling frame and configured to be turned about center of the opening as a turn axis; and
a swivel joint arranged at the center of the opening,
wherein the top plate includes:
a first joint support portion protruding toward the center of the opening and supporting the swivel joint; and
a second joint support portion protruding toward the center of the opening from a position opposite to, across the center, the first joint support portion and supporting the swivel joint,

wherein the first joint support portion has a first opening portion penetrating from an upper surface to a lower surface of the first joint support portion,
wherein the second joint support portion has a second opening portion penetrating from an upper surface to a lower surface of the second joint support portion,
wherein the swivel joint has a first fixing portion projecting in one direction in a horizontal direction and a second fixing portion projecting in another horizontal direction opposite to the one direction,
wherein the first joint support portion has:
a first attachment portion on which the first fixing portion is mounted; and
a first base portion gradually widening in a direction away from the first attachment portion,

the second joint support portion has:
a second attachment portion on which the second fixing portion is mounted; and
a second base portion gradually widening in a direction away from the second attachment portion,

wherein the first opening portion is provided on the first base portion and gradually widened in the direction away from the first attachment portion, and
wherein the second opening portion is provided in the second base portion and gradually widely formed in the direction away from the second attachment portion.