| 摘要 |
<p>An orbital vibrator (12) comprises a rotatable shaft (14) with a crank (28) attached thereto, a bearing (31) mounted on said crank, a reaction mass (30) mounted on said crank by means of said bearing and, by virtue of said mounting, orbitally oscillating about said crank in response to the rotation of said shaft in order to induce avibratory motion.</p> |
