| 主权项 |
1. A concrete vibrator head, which comprises:
an elongated body having a front end and a back end situated axially opposite the front end, and an outer surface situated between the front end and the back end, the outer surface having a continuously varying diameter over the axial length thereof between the front end and the back end of the elongated body, the elongated body defining an interior bore; means situated at the back end of the elongated body for connecting the elongated body to a flexible rotatable shaft; and a rotatable eccentric situated within the interior bore of the elongated body, the eccentric, when rotated, causing the elongated body to move radially and to vibrate, the elongated body, when moving radially and vibrating, transmitting shock waves into a volume of a concrete mixture into which the concrete vibrator head is placed; wherein the outer surface includes a front sloping segment having a conical shape and a back sloping segment having a conical shape and being axially adjacent the front sloping segment, the front sloping segment of the outer surface meeting the back sloping segment of the outer surface at a common circumferential line on the outer surface of the elongated member, the front sloping segment of the outer surface having a forward taper which slopes at a first fixed angle over the entire length of the front sloping segment in that the diameter of the outer surface over the front sloping segment continuously decreases linearly in diameter in a direction from the common circumferential line toward the front end of the elongated body, the back sloping segment of the outer surface having a rearward taper which slopes at a second fixed angle over the entire length of the back sloping segment in that the diameter of the outer surface over the back sloping segment continuously decreases linearly in diameter in a direction from the common circumferential line toward the back end of the elongated body; and wherein, when the concrete vibrator head is placed in the volume of the concrete mixture and the elongated body thereof is caused to vibrate, the front sloping segment of the concrete vibrator head contacts and transmits shock waves into the volume of the concrete mixture when the concrete vibrator head is moved in the concrete mixture in a first direction, and the back sloping segment of the concrete vibrator head contacts and transmits shock waves into the volume of the concrete mixture when the concrete vibrator head is moved in the concrete mixture in a second direction which is opposite the first direction. |
