| 摘要 |
A device for smoothing and flattening newly laid concrete or like plastic mass. The device is of the kind comprising a beam (1) having connected thereto a rotary-type vibrator (5), intended to impart a vibratory movement to the beam when the beam is moved across a concrete surface (2) or the like. The vibrator (5) is arranged on one end of the beam (1) with its rotary axis substantially horizontal and substantially perpendicular to the longitudinal direction of the beam. To eliminate vertically acting vibrations in the beam, the vibrator is resiliently mounted in a manner such that substantially only vibrations acting in the longitudinal direction of the beam (1) are transmitted thereto, while vibrations acting in the vertical plane are substantially absorbed by the spring mounting (7, 8). Preferably the rotary axis of the vibrator (5) is located substantially on a level with a horizontal plane passing through the centre of the beam structure (1). |
