Patent ID: 7246846

Claim:
A cab in a construction machine, comprising the cab being mounted on a turntable in a position offset from a rotational center of the turntable, the turntable being mounted on a traveling gear; a sliding door being provided at an outer side portion at a left side of the cab, the sliding door being formed to have a curved surface bulging outward, the cab comprising: four pillars in total, the four pillars including: an outer central pillar being provided at a center portion of the cab and forming the center portion on the left side of the outer side portion of the cab, the outer central pillar having a shape bulging outward within a radius of rotation of the turntable, an inner central pillar being provided at an inner side portion of the cab and located opposite to the outer central pillar, the outer central pillar and the inner central pillar respectively being provided at left and right sides of the cab, and an outer front pillar and an inner front pillar being provided at a left and a right corner portions at a front end of the cab; first and second frames extending rearward from respective middle positions of the outer central pillar and the inner central pillar, and an outer-outer casing plate and an inner-outer casing plate respectively being attached to the first and second frames, the outer-outer casing plate and the inner-outer casing plate respectively supporting the first and second frames; a third frame connecting respective end portions of the first and second frames; the first, second and third frames forming a rear portion of the cab; an upper guide rail being attached between respective upper portions of the outer central pillar and the outer front pillar; an intermediate guide rail being attached to an outer surface of the outer-outer casing plate, and a lower guide rail being attached between respective lower portions of the outer central pillar and the outer front pillar; and the sliding door engaging with the upper guide rail, the intermediate guide rail and the lower guide rail enabling the slide door to slide along an outer side surface of the cab.