A powder chamber, especially for or of a dental powder jet apparatus, including at least one conductive region, which is electrically conductive, where the at least one conductive region includes a contact surface, which is formed within the powder chamber.

The invention relates to a method and an apparatus for producing three-dimensional models by layering technology, using a core cleaning station.

An air wash abrasive particle separator apparatus which separates contaminants from previously-used abrasive particles contained in a contaminated abrasive particle mixture such that the abrasive particles may be re-used multiple times, the apparatus being in combination a contaminated abrasive particle mixture delivery device, an accumulator hopper assembly, a volume sensing device, an automatic flow control valve, a separator assembly and an air transfer device.

A system and method for selectively filtering abrasive particles for a cutting machine serves to filter variously shaped and dimensioned abrasive particles into a hopper through use of multiple, interchangeable screens. Each screen forms multiple openings defined by a shape and dimension, and each screen has a unique shape and dimension. A pneumatic variable speed motor vibrates the screens at variable speeds, depending on intensity of air flow through an air inlet. The sieve subassembly has a main base and containment ring. A two-piece split clamp ring sandwich the perimeter region of screens. From the hopper, a flow of high-pressure air carries the filtered abrasive particles to a waterjet cutting machine. The filtered abrasive particles are mixed with high pressure water to cut a workpiece. The shape and dimension of the abrasive particle is determinative of the type of workpiece to be cut.

A system and method for selectively filtering abrasive particles for a cutting machine serves to filter variously shaped and dimensioned abrasive particles into a hopper through use of multiple, interchangeable screens. Each screen forms multiple openings defined by a shape and dimension, and each screen has a unique shape and dimension. A pneumatic variable speed motor vibrates the screens at variable speeds, depending on intensity of air flow through an air inlet. The sieve subassembly has a main base and containment ring. A two-piece split clamp ring sandwich the perimeter region of screens. From the hopper, a flow of high-pressure air carries the filtered abrasive particles to a waterjet cutting machine. The filtered abrasive particles are mixed with high pressure water to cut a workpiece. The shape and dimension of the abrasive particle is determinative of the type of workpiece to be cut.

The subject of the invention is an abrasive blast machine for surfaces of large-scale workpieces comprising a housing (O) constituting a working chamber, a kinematic mechanism for moving the effector, an abrasive recirculation system, an effector feeding system with recirculated abrasive, characterized in that the kinematic mechanism is a multipart kinematic mechanism (MK) with at least four-axis, and in that, the effector is an impact turbine (T), which produces the treatment tool and directs it to the workpiece.

An abrasive blast cabinet uses a space frame to support panels defining an enclosed volume. One of the panels defines a view port and access ports. Illumination devices positioned on the one panel adjacent to and/or surrounding the view port illuminate the enclosed volume without significant shadowing, glare or reflections. The illumination devices are captured between a frame and the one panel and are protected from the blast environment by channel members which are covered by a transparent plate overlying the view port.

An abrasive blast cabinet uses a space frame to support panels defining an enclosed volume. One of the panels defines a view port and access ports. Illumination devices positioned on the one panel adjacent to and/or surrounding the view port illuminate the enclosed volume without significant shadowing, glare or reflections. The illumination devices are captured between a frame and the one panel and are protected from the blast environment by channel members which are covered by a transparent plate overlying the view port.

The invention relates to increasing a concentration of particles (92) in a circumferentially enclosed stream (90) of a fluid mixed with the particles in a target area (90ct) of a cross-section (90c) of the stream transverse to a flow direction (90f) of the stream. Deflecting surfaces (31.1, 31.2, 31.3) are arranged in the stream to extend over respective angular zones (30α1, 30α2, 30α3) with respect to an axis (la) through the target part. The deflecting surfaces slant in the flow direction in a direction from the circumference of the stream towards the target area, and define angularly in between them multiple bypass openings (32.1, 32.2, 32.3) which extend over angular zones complementary (30β1, 30β2, 30β3) to the angular zones over which the deflecting surfaces extend, and which are larger than the particles. The deflecting surfaces deflect at least a part of the particles inwardly towards the axis. A target part (90t) of the stream with the target cross-section around the axis is discharged through an outlet (20), and a remaining part (90r) is discharged through the openings, between the target part and the circumference of the stream, such as to discharge the stream as composed of the target part and the remaining part. The invention relates to an assembly comprising a circumferential enclosure and a particle concentrating device, a particle concentrating device, a concentrator element, a method for increasing a concentration of particles, a method for directional drilling and the use of the assembly.

The invention relates to increasing a concentration of particles (92) in a circumferentially enclosed stream (90) of a fluid mixed with the particles in a target area (90ct) of a cross-section (90c) of the stream transverse to a flow direction (90f) of the stream. Deflecting surfaces (31.1, 31.2, 31.3) are arranged in the stream to extend over respective angular zones (30α1, 30α2, 30α3) with respect to an axis (la) through the target part. The deflecting surfaces slant in the flow direction in a direction from the circumference of the stream towards the target area, and define angularly in between them multiple bypass openings (32.1, 32.2, 32.3) which extend over angular zones complementary (30β1, 30β2, 30β3) to the angular zones over which the deflecting surfaces extend, and which are larger than the particles. The deflecting surfaces deflect at least a part of the particles inwardly towards the axis. A target part (90t) of the stream with the target cross-section around the axis is discharged through an outlet (20), and a remaining part (90r) is discharged through the openings, between the target part and the circumference of the stream, such as to discharge the stream as composed of the target part and the remaining part. The invention relates to an assembly comprising a circumferential enclosure and a particle concentrating device, a particle concentrating device, a concentrator element, a method for increasing a concentration of particles, a method for directional drilling and the use of the assembly.