| 摘要 |
<p>An improved drum for a lorry-based concrete mixer is described. The drum comprises a drum body having an edge defining an aperture for permitting access to a drum body interior and a manhole cover hingedly attached to the drum body, the manhole cover being movable from an aperture dosed position, in which the aperture is sealed, to an aperture open position, in which the aperture is open and the drum body interior may be accessed. The drum further comprises at least one locking mechanism adapted to lock the manhole cover In the aperture dosed position, an edge of the manhole cover being trapped between the/each locking mechanism and the drum edge in the aperture closed position. The at least one locking mechanism is adapted to support the manhole cover in a retained position between the aperture dosed position and the aperture open position.</p> |
