Construction machine

Abstract

A construction machine which comprises an undercarriage, an upper structure rotatably mounted on a top of the undercarriage, and a work equipment movably supported at a front of the upper structure, in which within a frame assembly that forms a base of the upper structure, at least following components are produced by casting a weldable material: a work equipment support that supports the work equipment; a right vertical rib and a left vertical rib, a distance therebetween widening gradually as they extend backwards from the work equipment support; a bottom plate that extends towards inside, adjoining bottom edges of the work equipment support, the right vertical rib and the left vertical rib.

1 . A construction machine comprising an undercarriage, an upper structure rotatably mounted on a top of the undercarriage, and a work equipment movably supported at a front of the upper structure, wherein within a frame assembly that forms a base of the upper structure, at least following components are produced by casting a weldable material: a work equipment support that supports the work equipment; a right vertical rib and a left vertical rib, a distance therebetween widening gradually as they extend backwards from the work equipment support; a bottom plate that extends towards inside, adjoining bottom edges of the work equipment support, the right vertical rib and the left vertical rib.  
   
   
       2 . The construction machine according to  claim 1 , wherein within the frame assembly a rear vertical rib that adjoins back edges of the right vertical rib and the left vertical rib is produced by casting together with the work equipment support, the right vertical rib, the left vertical rib, and the bottom plate.  
   
   
       3 . The construction machine according to  claim 1 , wherein the material used in the casting is cast steel.  
   
   
       4 . The construction machine according to  claim 2 , wherein the material used in the casting is cast steel.