초록 ▼

Building materials such as concrete, mortar and plaster are placed in a bag which is suspended in a bottomless drum. A handle is used to move a plunger 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 ba

Building materials such as concrete, mortar and plaster are placed in a bag which is suspended in a bottomless drum. A handle is used to move a plunger 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 is rotationally indexed with reciprocal movements of the plunger, which also moves laterally. The plunger has an interchangeable head having a leading face which is inclined with respect to the direction of lateral movement on the upward stroke, and at least one inclined downwardly-facing facet.

대표청구항 ▼

1. A method of preparing a homogeneous mixture of two or more materials which comprises:placing the materials to be mixed into a bag (12) formed of flexible material; suspending three bag from an upper region thereof above a plunger (4); and producing relative up-and-down movement between the bag an

1. A method of preparing a homogeneous mixture of two or more materials which comprises:placing the materials to be mixed into a bag (12) formed of flexible material; suspending three bag from an upper region thereof above a plunger (4); and producing relative up-and-down movement between the bag and plunger such that the plunger repeatedly moves part of the bag upwardly through the materials contained in the bag to cause mixing thereof; characterised byrelative lateral movement (B) between the plunger and the bag during such relative up-and-down movement, and by relative rotational indexing between the plunger and the bag with reciprocation of the plunger.