| 摘要 |
<p>Building materials such as concrete, mortar and plaster are placed in a bag (12) which is suspended in a bottomless drum (1). A handle (6) is used to move a plunger (4) up-and-down through the bottom of the drum such that the plunger repeatedly moves part of the bag upwardly through the materials contained in the bag to cause mixing thereof. The drum (1) is rotationally indexed with reciprocal movements of the plunger (4), which also moves laterally. The plunger has an interchangeable head (22) having a leading face (25) which is inclined with respect to the direction of lateral movement on the upward stroke, and at least one inclined downwardly-facing facet (27).</p> |
