초록 ▼

A portable screed for working concrete and having an elongated screed plate which has a flat bottom bearing surface and a width sufficient to permit the screed to float on the concrete while the screed is being guided by an operator. For imparting uniform vibrations to the screed plate for tamping t

A portable screed for working concrete and having an elongated screed plate which has a flat bottom bearing surface and a width sufficient to permit the screed to float on the concrete while the screed is being guided by an operator. For imparting uniform vibrations to the screed plate for tamping the concrete, the screed includes a stiffening brace extending substantially the length of the screed, a series of rigid, spaced cross supports secured to the brace, and a vibratory mechanism connected to vibrate the screed plate through the cross supports. A motor is mounted on the screed plate for operating the vibratory mechanism.

대표청구항 ▼

A portable screed for working concrete, said screed being manually operated by an operator who physically guides the screed over an area of freshly poured concrete and manually levels the screed and the concrete by raising or lowering the screed while the screed is in motion, comprising a. an elonga

A portable screed for working concrete, said screed being manually operated by an operator who physically guides the screed over an area of freshly poured concrete and manually levels the screed and the concrete by raising or lowering the screed while the screed is in motion, comprising a. an elongated, single screed plate having opposite sides and opposite ends, said screed plate having a flat bottom bearing surface and having a width sufficient to permit the screed to float on the concrete while the screed is being guided, and b. means for imparting uniform vibrations to the screed plate for tamping the concrete, comprising i. a brace extending substantially the length of said screed plate between the ends thereof and being rigidly secured thereto along one side of said screed plate, ii. a series of rigid, spaced cross supports secured to said brace, each said cross support extending transversely from said brace substantially to an opposite side of said screed plate and being rigidly secured thereto, and iii. a vibratory mechanism connected to vibrate said screed plate.