The Federal Reporter: With Key-Number Annotations ..., volume 30
The Federal Reporter: With Key-Number Annotations ..., volume 30
United States. Circuit Courts, United States. District Courts, District of Columbia. Court of Appeals, United States. Circuit Court of Appeals, United States. Commerce Court
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In January, 1875, a patent was granted to J. D. Shoots for an expansible bucket for chain-pumps, which showed a rubber disk upon a link between two metal buttons, and by screwing these buttons together pressure could be brought up^n the central por- tion of the rubber disk so as to expand it outwardly. Patents were also granted to Mooney and Hanlan and Van Duzer and Johnston prior to that granted to Churchill; but all of them showed the expansion to have been obtained by mere squeezing, so to s...peak, upon the central portion of a rubber disk, whereby the outer portion of it was expanded. In April, 1874, a patent was granted to M. D. Bennett for an expansible bucket, in which a rubber disk was shown working between convex and concave metal disks, whereby the outer periphery of the rubber disk was bent or curved downward, or released, so that it would spring up- ward, and thereby some degree of expansibility was obtained. There were also other expansible buckets, of which the Van Zant and Davis patents are good examples, where the expansion was obtained by a rub- ber disk carried upon a tapering spindle or link, and by means of a hole through the disk, and, by crowding or forcing this rubber disk further on the spindle, its outer periphery was to some extent expanded.
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