US 7,246,846 B2Granted

Cab for construction machine

AssigneeKomatsu Ltd.

InventorsHiroyuki Shioji, Akihide Namura, Tatsushi Itoh

Life of this patent

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Abstract

A cab capable of easily securing rollover protection strength at low manufacturing cost is offered. Four pillars are mounted in the front and rear, and left and right of the cab. Two of them are mounted respectively in a first position at the outer side portion where it bulges outward and in a second position on the inner side portion and opposite the first position in the left-and-right direction. At least one of the pillars is formed with a pipe. A U-shaped frame is firmly mounted between the upper ends of the left and right rear pillars among the four pillars, and directed rearward to form a U-shaped rear roof frame.

Claims7

Dependent claims

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.

11 more elements

Dependencies are inferred from the claim text.

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Abstract

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.

11 more elements