초록 ▼

When a conventional swivel working vehicle is constructed such that a real part of a swivel body is not extended beyond a traveling device in order to improve an operability at a small site, a balance weight must he significantly increased in weight so as to prevent falling and tumbling of a machine

When a conventional swivel working vehicle is constructed such that a real part of a swivel body is not extended beyond a traveling device in order to improve an operability at a small site, a balance weight must he significantly increased in weight so as to prevent falling and tumbling of a machine body. In the invention, left and right core metal projections of a crawler are laterally offset from a center line of the crawler and right and left lugs are formed on an outer peripheral surface of the crawler. The lugs are formed to assume the same shape on the right and left sides or laterally symmetrical shapes or occupy the same area on the right and left sides, and to be symmetrically shaped about a center of rotation of the swivel body between the left and right crawlers of the machine body.

대표청구항 ▼

[ What is claimed is:] [1.]1. A small radial swivel working vehicle, comprising:a pair of left and right traveling devices, each of said traveling devices including a crawler having a lateral edge and a medial edge;a plurality of laterally parallel core metal projections provided on each of said cra

[ What is claimed is:] [1.]1. A small radial swivel working vehicle, comprising:a pair of left and right traveling devices, each of said traveling devices including a crawler having a lateral edge and a medial edge;a plurality of laterally parallel core metal projections provided on each of said crawlers that are aligned in a longitudinal direction of said crawler on either side of a lateral middle line thereof;a swivel body horizontally rotatably mounted above a portion between said pair of traveling devices, a rotational center point of said swivel body being arranged at a substantially lateral middle portion between said pair of traveling devices;a balance weight provided in a portion of said swivel body having an outer surface which is circular when viewed in plan, wherein a horizontal distance between said outer surface of said swivel body and said rotational center point of said swivel body is less than a horizontal distance between said lateral edge of each of said crawlers and said rotational center point of said swivel body; anda working machine including a boom, a base end of said boom being pivoted on a pivot portion of said swivel body opposite to said balance weight with respect to said rotational center point, wherein a horizontal distance between said pivot portion of said swivel body and said rotational center point of said swivel body is substantially equal to a horizontal distance between said rotational center point of said swivel body and said lateral middle line of said core metal projections.