Cab of construction machinery

Abstract

PROBLEM TO BE SOLVED: To protect an operator inside a cab with a sufficient rigidity by suppressing the deformation of a rear space in the cab when a vehicle is turned over. SOLUTION: Left and right upper pillars 27 and 28 positioned on the ceiling side of a cab frame 12 are formed of left and right upper extension members 29 and 30 installed extendedly from the upper end side to the rear side of the left and right front pillars 22 and 23 and left and right connection members 31 and 32 connecting the rear end sides of the upper extension members 29 and 30 to the upper end sides of left and right rear pillars 24 and 25. Left and right connection members 31 and 32 are formed in solid beam members by a casting or forging means. Also, beam members 33 and 34 apart a distance in the longitudinal direction and extending in the lateral direction and having both ends joined to the connection members 31 and 32 by welding are installed between the connection members 31 and 32. COPYRIGHT: (C)2006,JPO&NCIPI

Description

technical field [0001] The present invention relates to a construction machine operator's cab suitable for forming an operator's cabin of, for example, a hydraulic excavator, a hydraulic crane, and the like. Background technique [0002] Generally, a construction machine such as a hydraulic excavator has a structure in which a cab is provided on an upper revolving body rotatably mounted on a lower traveling body, and the cab constitutes an operator's cab for boarding and disembarking operators. [0003] Such a prior art cab for a construction machine is formed into a substantially square box shape by the upper part, the front part, the rear part, and the left and right side parts. And, for example, the left and right side parts, etc., have a structure in which inner plates and outer plates made of, for example, steel sheets are joined in a superimposed state to form a space portion constituting a column portion inside (for example, refer to Patent Document 1-Japanese Patent ...

AI Technical Summary

Problems solved by technology

[0010] However, in this case, since it is only a structure in which a cab for a construction machine constituting a skeleton structure is assembled by connecting a plurality of pipes to each other using joints, a large external force is applied, for example, when the vehicle is overturned. There is a possibility of damage to the driver's cab, and there is a problem that it is necessary to fully implement safety measures to protect the operators inside.

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