초록 ▼

A vibratory concrete screed includes a frame and a substantially horizontal screed blade. A pair of end-mounted winches advance the screed along concrete forms into an area of unfinished plastic concrete. A concrete spreading device is translated back and forth along the length of the screed to part

A vibratory concrete screed includes a frame and a substantially horizontal screed blade. A pair of end-mounted winches advance the screed along concrete forms into an area of unfinished plastic concrete. A concrete spreading device is translated back and forth along the length of the screed to partially level the unfinished concrete before engagement by the screed blade. The concrete spreading device includes grading means having distributing means in the form of an auger and metering means in the form of a plow. The auger initially levels and redistributes the plastic concrete while the plow receives the plastic concrete from the trailing edge of the auger and regulates the level of plastic concrete discharged from the concrete spreading device and intercepted by the screed blade. A carriage maintains the grading means at a predetermined elevation in front of the screed blade and translates the spreading device along the length of the screed frame. The concrete spreading device operates on the unfinished plastic concrete to feed a partially finished, constant height charge of concrete to the screed blade.

대표청구항 ▼

A vibratory concrete screed for finishing the surface of an area of unfinished plastic concrete lying between first and second spaced apart, generally parallel forms, the spacing between the first and second forms defining the width of the plastic concrete, said screed comprising: a. a frame having

A vibratory concrete screed for finishing the surface of an area of unfinished plastic concrete lying between first and second spaced apart, generally parallel forms, the spacing between the first and second forms defining the width of the plastic concrete, said screed comprising: a. a frame having first and second ends with a length equal to or greater than the width of the plastic concrete; b. a screed blade coupled to said frame and including a substantially horizontal blade surface and a leading edge; c. means coupled to said frame for advancing said screed along the length of said forms into the unfinished plastic concrete; d. means for vibrating said screed blade; and e. concrete spreading means coupled to said screed for partially levelling the unfinished plastic concrete and for regulating the charge height of the concrete intercepted by the leading edge of said screed blade, including i. an auger having a longitudinal axis, a leading edge and a trailing edge; ii. carriage means for maintaining said auger at a predetermined elevation in front of said screed blade with the longitudinal axis of said auger inclined at an angle to said screed blade with the leading edge of said auger extending outward from said screed blade and in front of the trailing edge of said auger, for translating said auger in either a first or a second direction along said screed frame, and for rotating said auguer to laterally redistribute said plastic concrete, to displace said concrete forward and away from said screed blade and to thereby form an intermediate, partially levelled concrete surface; and iii. metering means coupled to said carriage means to maintain a gap between said metering means and said screed blade, said metering means having a lower surface maintained below the intermediate concrete surface formed by said auger and above the horizontal blade surface of said screed blade for regulating the charge height of plastic concrete fed to the leading edge of said screed blade and for moving excess height plastic concrete forward into the rotating trailing edge of said auger where said excess height concrete is intercepted and displaced forward toward the leading edge of said auger and away from said metering means and is laterally redistributed by said auger as said carriage means translates said metering means and said auger in first and second directions along the length of said screed frame.