Cab for construction machinery

#This invention relates to a cab for construction machines, which can be suitably applied, for example, to hydraulic excavators, hydraulic cranes and the like.

#Generally, construction machines such as hydraulic excavators, for example, are largely constituted by a lower structure, an upper structure which is rotatably mounted on the lower structure, and a working mechanism which is provided on a front portion of the upper structure for lifting loads up and down. A cab is provided on a revolving frame of the upper structure as an operating room to be occupied by an operator at the control of the machine.

#The cabs of hydraulic excavators of this sort are usually formed in a box-like shape, from a standpoint of protecting operators. As for an example of such cabs for hydraulic excavators, there has been known a box-like cab construction, including mount bases located at four corners and each provided with an upward fitting joint projection, base link frames connecting the four mount bases in transverse and longitudinal directions, right and left front pillars erected on right front and left front mount bases, right and left rear pillars erected on right rear and left rear mount bases, right and left roof pillars connecting upper end portions of the front and rear pillars, a front tie frame connecting upper end portions of right and left front pillars, and a rear tie frame connecting upper end portions of right and left rear pillars (e.g., as disclosed in Japanese Laid-Open Patent Publication No. 2000-198469).

#In the accompanying drawings:

#FIG. 1 is a front view of a hydraulic excavator incorporating an embodiment of the present invention;

#FIG. 2 is an enlarged left-hand side view of the hydraulic excavator, with a front working mechanism omitted for the convenience of illustration;

#Hereafter, the construction machine cab according to the present invention is described more particularly by way of its preferred embodiments which are by way of example applied to a hydraulic excavator, with reference to FIGS. 1 through 13.

#In the accompanying drawings, indicated at 1 is a lower structure of the hydraulic excavator, and at 2 an upper structure which is rotatably mounted on the lower structure 1. A front working mechanism 3 is provided on a front portion of the upper structure 2 for lifting a front attachment up and down, for example, for an excavating operation.

#The upper structure 2 is largely constituted by a revolving frame 4, a cab 11 which is mounted on a left front portion of the revolving frame 4, which will be described hereinafter, an outer shield cover 5 which is provided on the revolving frame 4 and on the right and rear sides of the cab 11 as shown in FIGS. 2 and 3, a counterweight 6 which is attached to the rear end of the revolving frame 4, and an engine 7 which is mounted transversely on the revolving frame 4 at a position on the rear side of the cab 11.