| 摘要 |
<p>In the parent patent, a mould frane comprises a supporting base with slotted sidepieces into which an oscillating arm, serving as the second supporting element, fits. The arm has pairs of fingers or wheels jutting outwards which moved in the slots. The oscillating arm is displaced manually between high and low positions. In the addition, the limitation on size is removed by incorporating a pneumatic piston and cylinder to act between the base and the oscillating arm.</p> |
