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AssigneeInternational Pipe Machinery Corporation
InventorsGerald R. Crawford, Brian J. Kozlowski
Estimating the term…
A packerhead, a concrete pipe making machine having said packerhead, and a method of making concrete pipe are disclosed in which twist forces on the reinforcing wire cage of the pipe and concrete voids are eliminated by rotation of the longbottom and rollerhead portions of the packerhead in opposite directions. The peripheral speed of the system is also increased over conventional systems.
In a wire reinforced concrete pipe making machine,
In a wire reinforced concrete pipe making machine,
A high speed method of making reinforced concrete pipe comprising the steps of
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Methods or machines specially adapted for the production of tubular articles: incorporating reinforcements or inserts
Using rotatable mould or core parts: using compacting heads, rollers, or the like
Shaping clay or other ceramic compositions
Term ended 21 Dec 2002 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to a method and apparatus for the production of concrete pipe by the packerhead system. It is particularly concerned with a packerhead, a concrete pipe making machine, and a method of making concrete pipe which yields greater production in a given unit of time, eliminates cage twist which is now a problem in the packerhead method of concrete pipe production, and eliminates concrete voids around the cage wire.
A packerhead for use in a concrete pipe making machine is provided which is bi-directional in operation in that the rollerhead (or wingblock frame) rotates independently, and, preferably, in the opposite direction of, the longbottom (or trowel). Specifically, the rollerhead and longbottom are rotated at different speeds in the same direction, or, preferably, in the same or different speeds in opposite directions. Further, the packing element peripheral speeds can be increased from the present practical maximum of about 12,000 inches per minute up to about 14,000 inches per minute on both small and large diameter concrete pipes, with the result that cage twist of the wires which form the reinforcing cage in the pipe is eliminated, and, simultaneously, concrete voids which are frequently if not invariably encountered in conventional systems (including dual packerhead systems) is eliminated.
The invention is illustrated more or less diagrammatically in the accompanying Figures wherein:
FIG. 1 is an elevation, with parts broken away for clarity, of a concrete pipe making machine which includes the new and unique packerhead disclosed herein;
FIG. 2 is a section through the packerhead of this invention to an enlarged scale as compared to FIG. 1;
Referring first to FIG. 1, a concrete pipe making machine is indicated generally at 10. The machine includes a generally inverted U-shaped main frame 11 which includes a horizontal platform 12 and horizontal members 13, 14, 15, and 16 and vertical members 17 and 18.
A crosshead is indicated generally at 20, the crosshead being supported from horizontal members 15 and 16 and vertical members 17 and 18 by means of clamps or U-shaped connecting members 21, 22.
A gear box is indicated at 23. A drive unit assembly which may, if desired, be an auxiliary rollerhead drive system is indicated at 24, the auxiliary roller drive system (sometimes hereafter referred to as ARDS) being bolted to and depending downwardly from the gear box 23.