초록 ▼

An apparatus and method are disclosed for pivoting a screed assembly during screeding of placed and/or poured, uncured concrete or like loose, spreadable materials to maintain proper screeding contact by the screeding assembly with the concrete or like material by counteracting the force of concrete

An apparatus and method are disclosed for pivoting a screed assembly during screeding of placed and/or poured, uncured concrete or like loose, spreadable materials to maintain proper screeding contact by the screeding assembly with the concrete or like material by counteracting the force of concrete or other like material acting against the screed assembly as it is moved along the concrete. The apparatus includes a support, preferably of the self-propelled type, a boom and boom mount, and a pivot between the boom and the screed assembly. The axis of the pivot extends generally perpendicularly to the screeding direction in which the screed sassmblyis moved. A power source, such as a pair of fluid cylinders, rotates the screed about the pivot axis, preferably in response to an electro-hydraulic leveling sensor mounted on the screed. The lateral incline of the screed perpendicular to the screeding direction may be controlled about additional pivot axes orthogonal to the first. A power operated elevation control is preferably responsive to a fixed laser beam reference plane positioned externally of the screed assembly. The boom is telescoping and has multiple sections for extending and retracting the screeding assembly with respect to the support. The screed preferably includes a vibration assembly vibrationally isolated from the remainder of the screed for smoothing the concrete.

대표청구항 ▼

An improved screeding apparatus for loose or plastic materials such as placed and/or poured, uncured concrete previously placed on the ground or another support surface, said apparatus being of the type including a support for supporting said apparatus on the ground or a support surface, a boom exte

An improved screeding apparatus for loose or plastic materials such as placed and/or poured, uncured concrete previously placed on the ground or another support surface, said apparatus being of the type including a support for supporting said apparatus on the ground or a support surface, a boom extending outwardly from said support, boom support means for mounting said boom on said support, a screed assembly, and screed mounting means for mounting said screed assembly on said boom, the improvement comprising: said screed assembly being elongated and including a striker for engaging and spreading the material, rotatable auger means for moving the material along the direction of elongation of said screed assembly, and vibration means for engaging, vibrating and smoothing the material, said striker and vibration means being spaced on opposite sides of said auger means; articulated means for pivotally mounting said screed assembly on a first pivot axis extending generally parallel to the direction of elongation of said screed assembly, said pivot axis being positioned generally in vertical alignment with said auger means; motive power means for pivoting said screed assembly about said pivot axis whereby contact of said striker and vibration means with the material may be varied and adjusted. A method of screeding material such as placed and/or poured, uncured concrete with a screed assembly comprising: providing a screed assembly having a striker for engaging and spreading the material, means for moving the material in a lateral direction across the path of travel of said screed assembly, and vibration means for engaging, vibrating and smoothing the material; moving the screed assembly through the material in a predetermined direction to spread, grade and smooth the material; pivoting the striker, means for moving the material and vibration means of the screed assembly in unison about an axis perpendicular to said predetermined direction during such movement to counteract the force of the material acting on said screed assembly and to maintain effective screeding contact of said screed assembly with the material during such movement.