This is the basic removable Elrod mold, not present in the "nozzle" design of the basic Elrod patent 1,438,951 filed 1917 (issued 1922). It also specified a number of important changes in operational details.
There are now three heaters, as in later practice.
There is still no Sealing Valve. The process described for removing air from the mold chamber differs from later practice. Air is supposed to be forced out past the mold during the sealing process, just before the seal is accomplished.
The original Elrod patent specified an oiler which was a pressure device driven mechanically by a ratchet and screw. Here, this has been changed to one in which the oiler operates by suction from the main plunger (creating a partial vacuum on its upstroke), not by pressure. Because of this, it still has a ball check valve as in the original Elrod patent (to keep the oil from being forced backwards through the oiler). However, it now also has a packing material as in later pratice, in what is very much like the later Diffusion Tube. (In later practice the oiler once again became a pressure device, weight driven, without a ball check valve but with packing in the Diffusion Tube.) Here, the "Diffusion Tube" (oiler outlet) is shown a small distance from the Mold, not lightly touching it as in later practice. The lubricant is specified simply as "heavy oil" in "minute quantities."
The water supply system is substantially the same as later practice, flowing into a sight-glass which is itself open to the atmosphere.
There is no Sealing Plate (such as later part AEC1019 for the Model E or AEC1069 for the Model F) or Mold Cover (later part AEC1328C). There is, however, a "guard plate" (part 42 in the patent drawings) which fits over the mold much like the Mold Cover. It seems intended, though, to hold the mold itself in, whereas the Mold Cover has a slide which is intended to shut off the outflow of typemetal should the strip being cast break.
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US patent documents are in the public domain. The PDF and PNG versions of them here are similarly in the public domain; I assert no additional rights on these versions.
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