These two patents cover a general revision of most of the implementation details of the Elrod. The principles remain the same as those of the basic patent of 1917/1922, but the machine described here closely resembles the modern Elrod in most of its details. These patents were filed as one and then split. In general, the first of them covers the machine left-to-right from the crucible to the puller, and the second continues to the material stacker.
The primary difference between the machine specified here and later Elrods is the oiler. The basic Elrod patent of 1917/1922 (1,438,951) specified a pressure oiler without a Diffusion Tube or packing which was actuated by a ratchet and screw. Subsequent mold patents specified a different oiler operating by suction rather than pressure. One of these (1,567,363) specified something like a Diffusion Tube, with packing Here, in the "revised" machine of 1929, the oiler remains a suction oiler, but no packing is specified for the Diffusion Tube.
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Although the drawings and description of the second patent (the second division of the original filing) cover the entire machine, the claims relate primarily to the cutter. Perhaps this is because, as Hess indicated, there were difficulties with Monotype over cutter patents?
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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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