Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
186 words
An extrusion machine for making elongated articles of concrete by forcing the concrete through a mold, the article having a relatively large core, the machine being moved forwardly by reaction as the concrete is forced against the molded concrete, comprising a rotatable spiral conveyor (20, 22) in and extending longitudinally of the mold (26) for moving the concrete through the mold (26), and a non-rotatable forming element (28, 30, 32) for forming the internal cavity, which forming element is positioned in the mold (26) immediately following the downstream end of the conveyor (20, 22), with its lower edge positioned so that not more than 10% of the height of the forming element (28,30,32) is below the lower edge of the conveyor (20, 22), and its longitudinal center line is higher than the center line of the conveyor, the forming element being formed with a ramp (34) extending upwardly from the downstream end of the conveyor, the lower edge and lower sides of the forming element being free of any substantial ramp, and the conveyor forcing the concrete over the forming element to form the concrete article.
Claim 2
Dependent Claim
186 words
An extrusion machine for making elongated articles of concrete by forcing the concrete through a mold, the article having a relatively large core, the machine being moved forwardly by reaction as the concrete is forced against the molded concrete, comprising a rotatable spiral conveyor (20, 22) in and extending longitudinally of the mold (26) for moving the concrete through the mold (26), and a non-rotatable forming element (28, 30, 32) for forming the internal cavity, which forming element is positioned in the mold (26) immediately following the downstream end of the conveyor (20, 22), with its lower edge positioned so that not more than 10% of the height of the forming element (28,30,32) is below the lower edge of the conveyor (20, 22), and its longitudinal center line is higher than the center line of the conveyor, the forming element being formed with a ramp (34) extending upwardly from the downstream end of the conveyor, the lower edge and lower sides of the forming element being free of any substantial ramp, and the conveyor forcing the concrete over the forming element to form the concrete article.
Claim 3
Dependent Claim
16 words
A machine as claimed in Claim 1, including a vibrator (66) within the forming element (28).
Claim 4
Dependent Claim
22 words
A machine as claimed in Claim 2, including a vibrator plate (72) on top of the mold (26), above the forming element..
Claim 5
Dependent Claim
23 words
A machine as claimed in Claim 1, in which the forming element is free of any substantial ramp at its bottom upstream edge.
Claim 6
Dependent Claim
33 words
A machine as claimed in Claim 4, in which any ramp present at the bottom upstream edge of the forming element is short and does not exceed 25% of the forming element length.
Claim 7
Dependent Claim
45 words
A machine as claimed in Claim 2, in which there are a plurality of forming elements (28, 30, 32), the first element (28) formed with the vibrator (66), the subsequent elements (30, 32) being unvibrated, and with vibration damper means (64) between each forming element.
Claim 8
Dependent Claim
14 words
A machine as claimed in Claim 1, in which the forming element is removable.
Claim 9
Dependent Claim
25 words
A machine as claimed in Claim 6, in which the vibration damper means (64) is a rubber disc between and secured to adjacent forming elements.
Claim 10
Dependent Claim
36 words
A machine as claimed in Claim 1, including a plurality of screw conveyors (20, 22) and a plurality of forming elements (28, 30, 32) so that the machine is able to form wide, relatively flat articles.