This invention concerns a tension screen with a screen area including screen linings stretched over machine-mounted crossbars with a camber, where the screen linings have a plastic wear layer with screen passages and wire tension cables that run across the crossbars and are braced on the machine by connecting elements at the ends.

A mud slurry cleaning method including steps of distributing a mud slurry across an inclined primary separation screen, vibrating the primary screen through selected movement, cycle and frequency to screen out the liquid and selected particles, concurrently changing the geometric shape of the openings of the primary screen through each vibration cycle to free particles as might tend to lodge while concurrently impacting the primary screen at many spaced apart impact points to loosen particles tending to lodge, cyclonically separating the screened mud into a finally cleaned slurry and a thickened slurry including particles originally included in the original slurry, mixing the thickened slurry with a portion of the screened slurry to form a liquified slurry, distributing the liquified slurry across an inclined gleaning screen, and vibrating the gleaning screen as above described to screen out liquid and desired particles while concurrently changing the geometric shape of the openings of the screen and concurrently impacting the screen to loosen particles as above described. Mixing the clean slurry from the hydrocyclone separators with the liquid coming through the gleaned screen for return for use in the wellbore. Also discloses specialized apparatus used in the method.

A screening deck is shown and described including an intermediate frame structure mountable to the screening deck in a manner similar to that of an original screen component, but providing mounting formations for attachment of a plurality of screen modules thereon. The screening deck need not be modified in order to receive the intermediate frame. The intermediate frame may be applied to either a crowned screening deck or a flat screening deck. In the crowned configuration, the intermediate frame takes a form similar to the original screen, but includes mounting rails for receiving the screen modules. In the flat screening deck configuration, individual intermediate frame components mount along the longitudinal support beams and provide formations for mounting of screen components thereon. In each illustrated embodiment, individual screen components are mounted and dismounted without separate fastening elements and enjoy support along at least two edges thereof.

A screen panel module for mounting on a screen deck frame for screening, separating and grading materials such as ores. The module comprises a stiff frame component for supporting a resiliently flexible screening surface provided by a panel component. Opposite sides of the panel component include depending flanges having ribs for seating in complementary grooves in sides of the frame component for removably mounting the panel component on the frame component. The module includes means such as ribs, grooves, beads or the like, preferable associated with both the panel and frame components for interengaging with fixing means for locating and fixing the module to a screen deck frame. Whereas the whole of a prior art screen module has to be exchanged when worn, the invention allows the exchange of one component of a module, namely the panel component, which component costs a fraction of the whole module.

In order to improve a wind stop device for convertible vehicles, comprising a wind blocker consisting of two wind blocker parts which, for their part, can be brought about a wind blocker folding axis from an extended position, in which the wind blocker extends with a maximum extension in a direction of extension, into a folded position, in which the two wind blocker parts are essentially located on top of one another, and further comprising a cover with two cover parts for a section of a passenger compartment opening, in such a manner that this is more easily manageable during folding it is suggested that the cover parts be mounted on one another so as to be pivotable about a cover folding axis and be adapted to be brought from an extended position, in which the cover extends with a maximum extension in the direction of extension, into a folded position, in which the two cover parts are essentially located on top of one another, and that in a functional position the wind blocker and the cover be connected to one another at least by a connection of one of the wind blocker parts to the one of the cover parts bordering on it.