초록 ▼

A powered rotary screed provides a powered strike tube that rotates to provide a finish to wet concrete during screeding and a drive tube that provides motive power to the screed to assist with the difficult task of removing excess concrete from a poured pad, or other horizontal concrete surface. No

A powered rotary screed provides a powered strike tube that rotates to provide a finish to wet concrete during screeding and a drive tube that provides motive power to the screed to assist with the difficult task of removing excess concrete from a poured pad, or other horizontal concrete surface. No framework or other supporting structure extends between ends of the screed thereby making the screed more portable than comparable screeds having a structure that supports the roller tubes and extends the length of the screed. Handles are pivotally coupled to plates at each end of the screed to maneuver and control the screed during operation. Because the handles are pivotally mounted, they can be pivoted outward to permit the screed to maneuver close to obstacles located near the pad. Additionally, the combination of the handles, strike tube, and drive tube permit the handles to be used as levers to control the effective motive power of the drive tube, thereby providing substantial control to the screed operators.

대표청구항 ▼

1. A frameless roller screed, comprising:a) a first tube having a length terminating in a first end and a second end; b) a second tube having a length terminating in a first end and a second end; c) a first plate element rotatably coupled to the first ends of the first and second tubes so that the f

1. A frameless roller screed, comprising:a) a first tube having a length terminating in a first end and a second end; b) a second tube having a length terminating in a first end and a second end; c) a first plate element rotatably coupled to the first ends of the first and second tubes so that the first and second tubes can rotate independently of each other; d) a second plate element rotatably coupled to the second ends of the first and second tubes so that the first and second tubes can rotate independently of each other; e) a first driver coupled to the first tube that can rotate the first tube; f) a second driver coupled to the second tube that can rotate the second tube; g) having no frame and no structure extending from the first end to the second end of the first and second tube; and, h) a handle having an elongate lever portion and a handle portion, the lever portion operably secured to one of said first or second plates at a contact point between said first and second tubes such that raising or lowering the handle portion causes the screed to pivot about said first tube and thereby regulates the amount of motive force provided by said second tube.