Backhoe

Abstract

A backhoe includes a boom with one end rotatably supported by a supporting structure fixed on a working vehicle, and a boom cylinder with one end rotatably supported by the supporting structure, and with another end rotatably supported by the boom, the boom cylinder that drives the boom by operating in a freely retractable manner. The boom cylinder includes a piston, a cylinder tube that contains the piston, a piston rod connected to the piston, a scale rod fixed in parallel to the piston rod and operates along the outer surface of the cylinder tube in response to an operation of the piston rod, a scale arranged on the outer surface of the cylinder tube along the scale rod, and an indicator provided on the piston rod and operates along the scale in response to the operation of the piston rod.

What is claimed is: 
     
         1 . A backhoe comprising:
 a boom with one end configured to be rotatably supported by a supporting structure fixed on a working vehicle; and   a boom cylinder with one end configured to be rotatably supported by the supporting structure, and with another end configured to be rotatably supported by the boom, the boom cylinder configured to drive the boom by operating in a freely retractable manner,   wherein the boom cylinder includes:
 a piston; 
 a cylinder tube configured to contain the piston; 
 a piston rod configured to be connected to the piston; 
 a scale rod configured to be fixed in parallel to the piston rod and configured to operate along an outer surface of the cylinder tube in response to an operation of the piston rod; 
 a scale configured to be arranged on the outer surface of the cylinder tube along the scale rod; and 
   an indicator configured to be provided on the scale rod and configured to operate along the scale in response to the operation of the piston rod.   
     
     
         2 . The backhoe according to  claim 1 , further comprising an arm with one end configured to be rotatably supported by the boom;
 an arm cylinder with one end configured to be rotatably supported by the boom, and with another end configured to be rotatably supported by the arm, the arm cylinder configured to drive the arm by operating in a freely retractable manner;   a bucket with one end configured to be rotatably supported by the arm; and   a bucket cylinder with one end configured to be rotatably supported by the arm and with another end configured to be rotatably supported by the bucket, the bucket cylinder configured to drive the bucket by operating in a freely retractable manner.