Patent ID: 8366212

Claim:
A crawler-type travel device comprising: a plurality of shoe plates; a first link section coupling the shoe plates in an endless loop shape; a rotational wheel configured to be rotated in conjunction with movement of the first link section while making contact with the first link section; and a shaft having an inner axial end and an outer axial end, and supporting the rotational wheel while allowing the rotational wheel to rotate with respect to the shaft, the first link section including a plurality of first link members with the first link members being respectively attached to the shoe plates, the first link members being coupled to each other at end portions thereof while the end portions of the first link members are overlapped when viewed in an axial direction of the shaft, and the rotational wheel including a first roller making contact with a first end portion of the first link section corresponding to an outer side part of the overlapped end portions of the first link members in the axial direction, and a second roller aligned with and disposed on an inner side of the first roller in the axial direction, the second roller being configured and arranged to rotate independently from the first roller, the second roller making contact with a second end portion of the first link section corresponding to an inner side part of the overlapped end portions of the first link members in the axial direction with the second end portion being overlapped with the first end portion when viewed in the axial direction.