Work stage apparatus

Abstract

A work stage apparatus includes a backspan having a rear extremity and an opposed front extremity, and a frame having a stage extending outward from a base mounted to the front extremity for selective movement of the frame between a raised position in which the base extends upright from the front extremity to the stage extending rearward above the backspan and a lowered position in which the base extends downward from the front extremity to the stage extending forward from the base, the stage for supporting a worker at an elevated location when the frame is in the lowered position.

1 . A work stage apparatus, comprising:
 a backspan including a rear extremity and an opposed front extremity; and   a frame including a stage extending outward from a base mounted to the front extremity for selective movement of the frame between a lowered position in which the base extends downward from the front extremity to the stage extending forward from the base a raised position in which the base extends upright from the front extremity to the stage extending rearward above the backspan from the base, the stage for supporting a worker at an elevated location when the frame is in the lowered position.   
     
     
         2 . The work stage apparatus according to  claim 1 , further comprising a tensile stay coupled between the base and the stage. 
     
     
         3 . The work stage apparatus according to  claim 1 , further comprising a lift mechanism coupled between the backspan and the frame, the lift mechanism configured to lift and lower the frame out of and into the lowered position. 
     
     
         4 . The work stage apparatus according to  claim 3 , wherein the lift mechanism comprises a winch. 
     
     
         5 . The work stage apparatus according to  claim 1 , further wheeled trucks each comprising a wheel mounted to a frame swiveled to a fixture mounted to the backspan for movement into and out of a lowered surface engaging position of the wheel extending below the backspan. 
     
     
         6 . The work stage apparatus according to  claim 5 , further comprising:
 a lock assembly;   the fixture enabled for moving into and out of the lowered surface engaging position of the wheel when the lock assembly is in an unlocked position; and   the fixture disabled from moving out of the lowered surface engaging position of the wheel when the lock assembly is in a locked position.   
     
     
         7 . The work stage apparatus according to  claim 1 , further comprising an extensible and retractable brace extending upright from the rear extremity of the backspan. 
     
     
         8 . The work stage apparatus according to  claim 7 , the brace comprising:
 a lower member;   an upper member;   the lower member extends upright from the rear extremity of the back span to the upper member;   the upper member extends upright from the lower member to a head, the lower member and the upper member joined reciprocally; and   an adjustment member rotated to the lower member, the adjustment member operatively coupled between the lower member and the upper member in which rotation of the adjustment member in opposite directions reciprocates the upper member relative to the lower member.   
     
     
         9 . A work stage apparatus, comprising:
 a backspan including a rear extremity and an opposed front extremity;   a stage assembly comprising a frame, including a base and an inner stage, and an outer stage, the inner stage extending outward from the base to the outer stage mounted to the inner stage for selective movement between a folded position in juxtaposition with the inner stage and an unfolded position extending outward from the inner stage, the stage assembly closed when the outer stage is in the folded position and open when the outer stage is in the unfolded position;   the base mounted to the front extremity for selective movement of the stage assembly when closed between a lowered position in which the base extends downward from the front extremity to the inner stage extending forward from the base to the outer stage in the folded position and a raised position in which the base extends upright from the front extremity to the inner stage extending rearward above the backspan from the base and the outer stage in the folded position; and   the inner stage and the outer stage for supporting a worker at an elevated location when the frame is in the lowered position and the outer stage is in the unfolded position.   
     
     
         10 . The work stage apparatus according to  claim 9 , further comprising a tensile stay coupled between the base and the inner stage. 
     
     
         11 . The work stage apparatus according to  claim 1 , further comprising a lift mechanism coupled between the backspan and frame, the lift mechanism configured to lift and lower the stage assembly when closed out of and into the lowered position. 
     
     
         12 . The work stage apparatus according to  claim 11 , wherein the lift mechanism comprises a winch. 
     
     
         13 . The work stage apparatus according to  claim 9 , further wheeled trucks each comprising a wheel mounted to a frame swiveled to a fixture mounted to the backspan for movement into and out of a lowered surface engaging position of the wheel extending below the backspan. 
     
     
         14 . The work stage apparatus according to  claim 13 , further comprising:
 a lock assembly;   the fixture enabled for moving into and out of the lowered surface engaging position of the wheel when the lock assembly is in an unlocked position; and   the fixture disabled from moving out of the lowered surface engaging position of the wheel when the lock assembly is in a locked position.   
     
     
         15 . The work stage apparatus according to  claim 9 , further comprising an extensible and retractable brace extending upright from the rear extremity of the backspan. 
     
     
         16 . The work stage apparatus according to  claim 15 , the brace comprising:
 a lower member;   an upper member;   the lower member extends upright from the rear extremity of the back span to the upper member;   the upper member extends upright from the lower member to a head, the lower member and the upper member joined reciprocally; and   an adjustment member rotated to the lower member, the adjustment member operatively coupled between the lower member and the upper member in which rotation of the adjustment member in opposite directions reciprocates the upper member relative to the lower member.