The disclosure features material separators for screening excavated material (e.g., rocks from soil.) In some implementations the materials separators include (a) a supporting frame; (b) a screening surface mounted at an incline on the supporting frame, the screening surface comprising a plurality of fixed bars that are attached to the frame in a manner to resist upward movement, and a plurality of shift bars that are attached to the frame at their upper and lower ends, in a manner to allow upward movement; and (c) a shift bar actuator, positioned between the upper and lower ends of the shift bars, the shift bar actuator being configured to impart a two-stage movement to the shift bars, whereby during a first stage the upper ends are first displaced vertically, and during a second stage the lower ends pivot upward about the upper ends.

The disclosure features material separators for screening excavated material (e.g., rocks from soil.) In some implementations the materials separators include (a) a supporting frame; (b) a screening surface mounted at an incline on the supporting frame, the screening surface comprising a plurality of fixed bars that are attached to the frame in a manner to resist upward movement, and a plurality of shift bars that are attached to the frame at their upper and lower ends, in a manner to allow upward movement; and (c) a shift bar actuator, positioned between the upper and lower ends of the shift bars, the shift bar actuator being configured to impart a two-stage movement to the shift bars, whereby during a first stage the upper ends are first displaced vertically, and during a second stage the lower ends pivot upward about the upper ends.

A sediment classification system enables the screening of material that enters a backhoe bucket. Material that enters the bucket exits through a duct with an opening at the back of the bucket. The material is screened by passing between a first set of bars and a second set of bars. The bars have spacers between them attached to one of the sets of bars. The second set of bars is pined to the first set and is able to move to clear material wedged between the bars.

A sediment classification system enables the screening of material that enters a backhoe bucket. Material that enters the bucket exits through a duct with an opening at the back of the bucket. The material is screened by passing between a first set of bars and a second set of bars. The bars have spacers between them attached to one of the sets of bars. The second set of bars is pined to the first set and is able to move to clear material wedged between the bars.

An apparatus for producing a construction material for use in the building industry is disclosed. The apparatus comprises a hopper (10) which includes a trough (11) having a base section and an open top to allow material to be added to the hopper. The base section of the hopper includes a grinding array (24). A separation array (152) is deployed above the open top with the separation array comprising a plurality of elongate tines (151), each having a first end and a second end, mounted parallel to each other, and secured at least at one end to a support means.

An apparatus for producing a construction material for use in the building industry is disclosed. The apparatus comprises a hopper (10) which includes a trough (11) having a base section and an open top to allow material to be added to the hopper. The base section of the hopper includes a grinding array (24). A separation array (152) is deployed above the open top with the separation array comprising a plurality of elongate tines (151), each having a first end and a second end, mounted parallel to each other, and secured at least at one end to a support means.

A bucket for crushing inert material comprises an outer casing, an inlet section for the entry of the material to be crushed into the casing and crushing unit arranged in the casing for crushing the material and a screening device for screening the material to be crushed disposed in a position intermediate between the inlet aperture and the crushing unit. The screening device comprises at least one rotating member, the partial rotation of which is suitable for performing a screening of parts of material to be crushed which are of a size below a predetermined dimension.

A bucket for crushing inert material comprises an outer casing, an inlet section for the entry of the material to be crushed into the casing and crushing unit arranged in the casing for crushing the material and a screening device for screening the material to be crushed disposed in a position intermediate between the inlet aperture and the crushing unit. The screening device comprises at least one rotating member, the partial rotation of which is suitable for performing a screening of parts of material to be crushed which are of a size below a predetermined dimension.

An apparatus for producing a construction material for use in the building industry is disclosed. The apparatus comprises a hopper (10) which includes a trough (11) having a base section and an open top to allow material to be added to the hopper. The base section of the hopper includes a grinding array (24). A separation array (152) is deployed above the open top with the separation array comprising a plurality of elongate tines (151), each having a first end and a second end, mounted parallel to each other, and secured at least at one end to a support means.

An apparatus for producing a construction material for use in the building industry is disclosed. The apparatus comprises a hopper (10) which includes a trough (11) having a base section and an open top to allow material to be added to the hopper. The base section of the hopper includes a grinding array (24). A separation array (152) is deployed above the open top with the separation array comprising a plurality of elongate tines (151), each having a first end and a second end, mounted parallel to each other, and secured at least at one end to a support means.