US Patent: 9,817X
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Sheaves
Sheaves for Blocks
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Patentee:
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| Cyrus Alger (exact or similar names) - Boston, Suffolk County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jul. 01, 1836 |
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Joel Havens
Wikipedia entry for Cyrus Alger
Alger's Gun Works
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Description: |
| Most of the patents prior to 1836 were lost in the Dec. 1836 fire. Only about 2,000 of the almost 10,000 documents were recovered. Little is known about this patent. There are no patent drawings available. This patent is in the database for reference only.
"Specification of a Patent for an improvement in the manufacturing of Cast Iron Sheeves. Granted to Cyrus Alger, Boston, Massachusetts, July 1, 1836. To all whom it may concern, be it known, that I, Cyrus Alger, of Boston, in the county of Suffolk, and State of Massachusetts, have invented a new and useful mode of manufacturing cast-iron sheeves, for blocks for vessels, and for other purposes where sheeves or pulleys are used, and I do hereby declare that the following is a full and exact description thereof.
I cast these sheeves in the ordinary way of casting such articles, but of a lighter pattern than usual, as, after being cast they are annealed, and rendered malleable. The eye, or hole in the centre, through which the pin is to pass, I make three-eighths of an inch, or more, larger than the pin, for the purpose of bushing it with case hardened iron. The bush I also make of castiron, which is to be annealed, turned true, and then case hardened, by the usual process of case hardening, by which means it is rendered perfectly hard upon the surface, whilst it is at the same time so tough as to obviate the danger of breaking from heavy pressure, or sudden jerks. This bush is fixed in its place by means of a set punch.
I tin these sheeves after annealing them, which effectually preserves them from rust, and they may also be coated with japan varnish
I do not claim the making of sheeves, or pulleys, of cast-iron, nor the annealing of such articles, as of my invention; nor indeed any part of the above described process taken separately; but what I do claim as my invention, or discovery, is the combination of an annealed cast-iron sheeve, with an annealed and case hardened bush of cast-iron, as herein set forth. CYRUS ALGER."
Journal of the Franklin Institute, Volume 19, Jan. 1837, pg. 31 |
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