Step apparatus for heavy construction equipment and tree harvester having leveling system

Abstract

A step apparatus for heavy construction equipment and tree harvester having a leveling system for controlling a horizontal level of a cab and an upper frame is provided, which includes a step protector including a main body fixedly installed on one side of an upper frame, a step guide hole opened from an inside of the main body to an outside, a guide rail formed along a length direction of an inner side wall of the main body, and an insert hole formed on one side of the guide rail and open toward a vertically upward direction of the guide rail; a side step including a plurality of foot steps arranged at specified intervals on a step frame to form stairs, a step drawer formed on an upper part of the step frame and seated in the step guide hole, and a guide pin positioned adjacent to the step drawer and projected toward the side wall of the main body, wherein when the guide pin is slid along the guide rail, the step frame is seated in the main body or is drawn out from the inside of the main body; and a folding actuator including a cylinder rod coupled to the step drawer to be extended and contracted, the folding actuator drawing the step drawer to the inside of the main body of the step protector.

1 .- 9 . (canceled) 
     
     
         10 . A step apparatus for heavy construction equipment and tree harvester having a leveling system for controlling a horizontal level of a cab and an upper frame, comprising:
 a step protector including a cylinder fixing holder formed inside a protector housing, first and second fixing lugs respectively formed apart from the cylinder fixing holder along a length direction of the protector housing, and a step protection cover attached to a lower part of the protector housing and having a step receiving hole penetratingly formed thereon to communicate with an inner part of the protector housing, the step protector being fixedly installed on one side of the upper frame;   a first step frame including a first lug support flange coupled to the first fixing lug, and a plurality of step support flanges formed apart from the first lug support flange, wherein the first lug support flange and the first fixing lug are rotatably fixed to each other;   a second step frame including a second lug support flange coupled to the second fixing lug, a plurality of step support flanges formed apart from the second lug support flange, and a fixing cam formed adjacent to the second lug support flange to support a rotating force generated about a rotating shaft formed on the second lug support flange, wherein the second lug support flange and the second fixing lug are rotatably fixed to each other;   foot steps fixed to the plurality of step support flanges formed in the first step frame and the second step frame, respectively; and   a folding actuator including a rod that can be extended and contracted, and having one side connected to the cylinder fixing holder and the other side connected to the fixing cam, the folding actuator providing the rotating force to the fixing cam by a predetermined pressure.   
     
     
         11 . The step apparatus of  claim 10 , wherein at least one of the first and second step frames has a projection angle θ2 and is fixed with an inclination so that at least one of the foot steps is projected to an outside of an outer wall of the step housing when the first and second step frames are exposed to an outside of the step protector at maximum. 
     
     
         12 . The step apparatus of  claim 10 , wherein the projection angle θ2 of the step frame is in the range of 5° to 40°. 
     
     
         13 . The step apparatus of  claim 10 , wherein the fixing cam is formed in a body with the second step frame. 
     
     
         14 . The step apparatus of  claim 10 , wherein the fixing cam is formed in a body with the second lug support flange. 
     
     
         15 . The step apparatus of  claim 10 , wherein the foot step is supported on one side of a support link that is rotatably shaft-engaged with the step support flange. 
     
     
         16 . The step apparatus of  claim 10 , wherein a safety cover is installed on a lower part of the foot step. 
     
     
         17 . The step apparatus of  claim 10 , further comprising a safety lever installed inside the cab to change a present mode to a safety mode or an operation mode;
 wherein if the safety lever is in the safety mode, the second step frame is drawn out to an outside of the step protector by the driving of the folding actuator, while if the safety lever is in the operation mode, the second step frame is rotated and folded inside the step protector by the driving of the folding actuator.   
     
     
         18 . The step apparatus of  claim 10 , wherein the folding actuator comprises a hydraulic cylinder that is extended and contracted. 
     
     
         19 . The step apparatus of  claim 10 , the first step frame is installed on the step receiving hole when the second step frame is folded and fixed inside the protector housing. 
     
     
         20 . The step apparatus of  claim 10 , wherein the safety cover is installed on the step receiving hole when the second step frame is folded and fixed inside the protector housing. 
     
     
         21 . The step apparatus of  claim 11 , wherein the projection angle θ2 of the step frame is in the range of 5° to 40°. 
     
     
         22 . The step apparatus of  claim 13 , wherein the fixing cam is formed in a body with the second lug support flange. 
     
     
         23 . The step apparatus of  claim 11 , wherein the foot step is supported on one side of a support link that is rotatably shaft-engaged with the step support flange. 
     
     
         24 . The step apparatus of  claim 11 , wherein a safety cover is installed on a lower part of the foot step. 
     
     
         25 . The step apparatus of  claim 17 , wherein the folding actuator comprises a hydraulic cylinder that is extended and contracted. 
     
     
         26 . The step apparatus of  claim 17 , the first step frame is installed on the step receiving hole when the second step frame is folded and fixed inside the protector housing.