US Patent: 5,616X
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| Working or Forging Iron by Portable Trip Hammer
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Patentee:
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| Samuel Kilburn (exact or similar names) - Sterling, Worcester County, MA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Aug. 18, 1829 |
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Patent Pictures:
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Journal of the Franklin Institute Vol. 8, Nov. 1829 pg. 335 |
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Joel Havens
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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.
“For a Portable Trip Hammer; Samuel Kilburn, Sterling, Worcester county, Massachusetts, August 18.
A fly wheel is to be turned by a crank, having upon the axis a cam wheel, with five teeth, or lifts, which are to operate upon the handle of the hammer. This machine is intended to be turned by hand, the hammer to weigh from 20 to 50 lb. and the fly wheel from 150 to 250. The part in which the merit of the machine is supposed to consist, is a combination of levers for giving motion to the crank, instead of turning it directly by hand. There are four of these levers, the first of which is moved backward and forward by hand, whilst the last of the series acts as a pitman, one end of it being attached to the crank. The claim of the patentee is to this combination of the levers, which he thinks will produce a great mechanical advantage. The sketch in the margin will serve to show the arrangement proposed. The first lever works on a fulcrum at A, being acted upon by the handle A at B; the third lever has its fulcrum at C, the fourth, or pitman, being attached to the crank D. As to any mechanical advantage E to be obtained by a combination of levers, where time and power are both taken into the account, it is a nullity. We, at one time, thought that the vibrating motion of B, might be less fatiguing than the turning of the common crank, and many years ago fixed a lever to turn the large wheel of a lathe upon this principle. Suppose the lever C, E, in the above sketch, to turn upon a fulcrum at E, the handle being at C, with the pitman and crank D, just as shown above, and our whole arrangement will be understood. It was kept in use for a considerable length of time, and those who worked it were undetermined in their opinions as respected its advantage over the crank. We mention this, because we think that the only possible benefit of Mr. Kilburn's levers, must be afforded by the application of the power of a man in a better manner than that usually followed; but even this, according to our experience, is doubtful.”
Journal of the Franklin Institute Vol. 8, Nov. 1829 pg. 335
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