Machine for extruding cement-like material into articles

Claim 2

In an extrusion machine for making elongated articles of concrete-like material by forcing the material through a mold, said machine being moved forwardly by reaction as the material is forced against the molded portion of the article, the improvement which comprises a fixed transverse plate positioned across and closing the upstream end of the mold and having at least one elongated forming element mounted at an end thereof on the plate and supported thereby so as to extend downstream from the plate within the mold, the transverse plate being apertured adjacent to but out of line with said end of said forming element for the introduction of said concrete-like material into the mold, at least one duct disposed upstream of said transverse plate and communicating with said mold only through an aperture of said transverse plate, each duct having an inlet and including pumping means for feeding said concrete-like material from said inlet and through the associated aperture of said transverse plate into said mold and around said forming element.

Claim 3

An extrusion machine as claimed in claim 1, wherein each of said ducts has a cross-sectional configuration differing from the aperture configuration, and wherein a transition piece is provided at the downstream end of each duct, which connects said duct to an aperture of the plate.

Claim 4

An extrusion machine as claimed in claim 2 wherein said transverse plate is formed with a plurality of apertures in the form of vertically oriented slots, and wherein said ducts are of circular cross-section, with said transition pieces flaring vertically and tapering horizontally into conformity with the slot configurations.

Claim 5

An extrusion machine as claimed in claim 1, wherein said transverse plate is formed with apertures at a level above said forming means.

Claim 6

An extrusion machine as claimed in claim 1, wherein said pumping means comprises a screw conveyor mounted in each duct.

Claim 7

An extrusion machine as claimed in claim 1, wherein there are a plurality of forming elements extending in axially parallel relation from said transverse plate.

Claim 8

An extrusion machine as claimed in claim 6, wherein said forming elements each flare from a root secured to said transverse plate to a downstream end at which the cross-section is of the desired moulding configuration.

Claim 9

An extrusion machine for making elongated articles of conCrete-like moldable material forcing the material through a mold, said machine being moved forwardly by reaction as the material is forced against the molded portion of the article, said machine comprising, a track, a frame mounted for horizontal movement in said track, side and top molding plates mounted within one end of said frame for lateral and vertical adjustment respectively to selectively vary the external dimensions of the article to be molded, a transverse plate positioned across said frame at the upstream ends of said molding plates and having at least one forming element mounted at an end thereof on the plate and supported thereby so as to extend downstream from the plate within the mold, the transverse plate being formed with apertures at positions adjacent to but out of line with said ends of the forming element for the introduction of said concrete-like material into said mold, a plurality of ducts of circular cross-section disposed upstream of said transverse plate, each duct having an inlet in the region of the upstream end, and being connected to one of said apertures in said transverse plate, a plurality of screw conveyors disposed one in each duct for feeding said concrete-like material along the ducts and through said apertures into said mold, sealed bearing means axially aligned with each screw conveyor at the upstream end of each duct, and a drive shaft extending through each sealed bearing and connected for driving the screw conveyor in the respective duct.

Claim 10

An extrusion machine for making elongated articles of conCrete-like moldable material forcing the material through a mold, said machine being moved forwardly by reaction as the material is forced against the molded portion of the article, said machine comprising, a track, a frame mounted for horizontal movement in said track, side and top molding plates mounted within one end of said frame for lateral and vertical adjustment respectively to selectively vary the external dimensions of the article to be molded, a transverse plate positioned across said frame at the upstream ends of said molding plates and having at least one forming element mounted at an end thereof on the plate and supported thereby so as to extend downstream from the plate within the mold, the transverse plate being formed with apertures at positions adjacent to but out of line with said ends of the forming element for the introduction of said concrete-like material into said mold, a plurality of ducts of circular cross-section disposed upstream of said transverse plate, each duct having an inlet in the region of the upstream end, and being connected to one of said apertures in said transverse plate, a plurality of screw conveyors disposed one in each duct for feeding said concrete-like material along the ducts and through said apertures into said mold, sealed bearing means axially aligned with each screw conveyor at the upstream end of each duct, and a drive shaft extending through each sealed bearing and connected for driving the screw conveyor in the respective duct.

Claim 11

An extrusion machine as claimed in claim 8, wherein said transverse plate is formed with apertures in the form of vertical slots on each side of each forming element, the vertical slots being connected to the ducts by transition pieces.

Claim 12

An extrusion machine as claimed in claim 8, wherein each forming element flares from a root secured to said transverse plate to a downstream end at which the cross-section is of the desired moulding configuration, and wherein said transverse plate is formed with apertures at a level above said forming elements and alternating therewith.

Claim 13

An extrusion machine as claimed in claim 8, wherein each forming element flares from a root secured to said transverse plate to a downstream end at which the cross-section is of the desired moulding configuration.