초록 ▼

A subgrading machine precisely levels and contours the subgrade within an area having first and second parallel oriented forms including parallel upper surfaces vertically spaced above the subgrade and defining a form surface plane. A grading blade extends along the front of a triangular truss frame

A subgrading machine precisely levels and contours the subgrade within an area having first and second parallel oriented forms including parallel upper surfaces vertically spaced above the subgrade and defining a form surface plane. A grading blade extends along the front of a triangular truss frame terminated by first and second end sections and having a length less than the spacing between the forms. The front and rear edges of the frame define a frame base plane. An adjustable end bracket is coupled to each frame end section and includes a form contact element for maintaining a parallel alignment between the frame base plane and the form surface plane. The form contact element is coupled at a selectable vertical position to each end bracket to vary the spacing between the frame base plane and the form surface plane to thereby determine the grading depth of the grading blade. A winch system provides a traction force having an effective horizontal force vector at approximately the same elevation as the grading blade and the subgrade.

대표청구항 ▼

A subgrading machine for precisely levelling and contouring the subgrade within an area having first and second parallel-oriented forms including parallel upper surfaces vertically spaced above the subgrade and defining a form surface plane, comprising: a. a triangular truss frame having a length le

A subgrading machine for precisely levelling and contouring the subgrade within an area having first and second parallel-oriented forms including parallel upper surfaces vertically spaced above the subgrade and defining a form surface plane, comprising: a. a triangular truss frame having a length less than the spacing between the first and second forms, a linear, load bearing front edge, and a linear, load bearing rear edge spaced apart from and oriented parallel to the front edge and defining a load bearing frame base plane, said frame being terminated by first and second end sections each having spaced apart front and rear surfaces extending vertically upward from the frame base plane; b. a rigid, load bearing grading blade mechanically secured to and extending along the load bearing front edge of said frame for engaging the subgrade, said blade including a curved blade section having an upper surface extending above the frame base plane and a lower surface protruding below the frame base plane; c. an adjustable end bracket coupled to the front and rear surfaces of each of said end sections for controlling the elevation of the frame to position the frame base plane below the form surface plane and for transferring the weight of said frame to the upper surface of said forms, including i. form contact means extending laterally outward from said end sections and having a lower surface contacting the upper surface of the adjacent forms for maintaining a parallel alignment between the frame base plane and the form surface plane; ii. a first roller assembly having first and second spaced apart cylindrical rollers rotatably coupled to the lower surface of said form contact means for establishing rolling contact between said adjustable end bracket and the upper surface of an adjacent form, wherein each of said rollers includes an axis of rotation oriented parallel to the front edge of said frame; iii. frame elevation control means for coupling said form contact means to said end section at a selectable vertical position to vary the spacing between the frame base plane and the form surface plane to thereby determine the grading depth of said grading blade with respect to the subgrade; and d. a winch system for advancing the machine into the uncontoured subgrade, including i. first and second winches coupled to the end sections of said frame for reeling in first and second winch cables to generate a traction force; ii. first and second pulleys coupled to the ends of said frame at an elevation intermediate to the upper and lower surfaces of said grading blade for lowering the elevation of the traction force exerted on said frame by said winch cables to a level in proximity to the subgrade and for causing the traction force to be distributed along the length of the load bearing front edge of said frame and through said grading blade into the subgrade to level and contour the subgrade as the machine is advanced by said winch system.