Abstract: A hydrocyclone (10) is disclosed in which the inlet section (14) of the chamber (13) has a curved inner side wall surface (29) which is generally in the shape of a volute (28), for directing material received in use from the feed inlet port (17) in a rotational motion. In the embodiment shown, the volute (28) is ramped axially downward within the inlet section (14), in a direction towards the conical separating section (15), and turns through an angle of more than 270 angle degrees. The conical section has a central axis X-X, and comprises two segments 32, 34 each being of a frustoconical shape, and joined together end to end to form a generally conical separating chamber (15). An internal angle A located between an inner wall surface (50) of the so-formed conical separating chamber (15) and a line parallel to the central axis X-X is ideally less than (8) angle degrees, to provide a hydrocyclone design with beneficial operating parameters.

Abstract: The workbench includes one or more trestle units (102) having pairs of legs (104) joined to each end of a cross-piece (106) by a hinge unit (108) which allows the legs to fold flat against each other and against the cross-piece of the trestle for storage. The hinge has a stop which allows the legs to be positioned away from each other and away from the crosspiece of the trestle to form a stable trestle unit. The workbench further includes a plurality of beams (500), wherein said beams are adapted to be connected to at least one trestle so as to form a supporting framework for a work piece. A folding brace (110) between pairs of legs further stabilizes the trestle. The beams and trestles have holes (126) in their ends, and the beams and the trestles have regularly spaced holes (128) in them. Pegs can be inserted into and through the holes, and they have locking parts on them, allowing them to lock onto the trestle or beam. Pegs can have two latches for attachment to different beams or trestles.

Abstract: The workbench includes one or more trestle units (102) having pairs of legs (104) joined to each end of a cross-piece (106) by a hinge unit (108) which allows the legs to fold flat against each other and against the cross-piece of the trestle for storage. The hinge has a stop which allows the legs to be positioned away from each other and away from the crosspiece of the trestle to form a stable trestle unit. The workbench further includes a plurality of beams (500), wherein said beams are adapted to be connected to at least one trestle so as to form a supporting framework for a work piece. A folding brace (110) between pairs of legs further stabilises the trestle. The beams and trestles have holes (126) in their ends, and the beams and the trestles have regularly spaced holes (128) in them. Pegs can be inserted into and through the holes, and they have locking parts on them, allowing them to lock onto the trestle or beam. Pegs can have two latches for attachment to different beams or trestles.