Abstract: In a method for applying a mortar mixture onto an application surface, a dry mortar starting mixture is prepared and conveyed by carrier air in a thin stream into a mixer arranged immediately upstream of a spray nozzle. The dry mortar starting mixture is mixed in the mixer with water to form a mortar-water mixture. The mortar-water mixture is moved in a dense stream to the spray nozzle. Compressed air is introduced into the spray nozzle and the mortar-water mixture is sprayed under the pressure of compressed air onto the application surface.

Abstract: A device for mixing a flowable or pourable medium has a container for receiving the medium and a rotatable shaft having radially projecting support arms and rotatable in a direction of rotation. Mixing elements are connected to the radially projecting support arms. The mixing elements are tubular and formed as coil-shaped spirals conically shaped at least across a partial length of the coil-shaped spirals. The coil-shaped spirals have a first end face and a second end face. The first end face points in the direction of rotation and has a cross-section greater than the cross-section of the second end face. The coil-shaped spirals have a central axis having a slant angle relative to a plane of rotation of the two mixing elements. The support arms and the coil-shaped spirals connected to the support arms, respectively, are formed of a single wire as a monolithic part, respectively.

Abstract: The invention relates to a method and a device for providing at construction sites paste-like building materials, especially mortar, being delivered in a fixedly pre-determined basic consistency. A conveying and mixing pump with an additional water supply opening is provided below the storage container for the paste-like building material. By means of the water supply opening, additional water is mixed with the mortar in order to produce the desired mortar consistency. For this purpose, a mixing portion having hedgehog-type mixing elements is provided.

Abstract: A rotary displacement pump has a stator having a base plate and two clamping plates. The base plate is clamped between the two clamping plates. A first clamping plate forms an outer wall of the pump. The base plate has an annular surface extending over a part circle or a full circle. An inlet opens into the annular surface and an outlet extends away from the annular surface. A diaphragm spans the annular surface and has edges tightly clamped to the base plate by a second one of the clamping plates. A driven rotor is arranged above the annular surface and rotates about the axis of the annular surface. The rotor has a plurality of rollers positioned at a regular spacing along the annular surface above the base plate. The rollers are freely rotatably supported in a common support. A circumferential arrangement of individually moveable pressure transmitting members is provided.

Abstract: A mortar mixing machine has a frame and a hopper supported by the frame for containing dry mortar. The hopper has an outlet with an outlet opening. A first conveying and mixing tube, connected in a working position thereof to the outlet so as to extend horizontally, has at least one water inlet and is designed for mixing the dry mortar fed into the conveying and mixing tube from the hopper with water introduced via the at least one water inlet to prepare mixed moist mortar. The first conveying and mixing tube has a removal opening for the mixed moist mortar remote from the outlet. A second conveying and mixing tube is connected to the frame for directly receiving in a working position thereof the mixed moist mortar. The second conveying and mixing tube conveys the mixed moist mortar in a direction opposite to the conveying direction of the first conveying and mixing tube. The second conveying and mixing tube has a drive and is slidably retractable into a rest position together with the drive.