US Patent: 336,793
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| Lifting Jack
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Patentee:
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| Thomas L. Chapman (exact or similar names) - Richmond, Henrico County, VA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Oct. 27, 1885 |
| Granted: |
Feb. 23, 1886 |
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Joel Havens
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Description: |
| Abstract:
In the drawings, A denotes the body of the jack, which is usually of a generally triangular shape from top to bottom, that is, it is larger in diameter at the base than at the top. Centrally through the upper part, A', of the body is the screw-threaded aperture, b, in which the screw C is moved, and in the lower part of the body is the chamber F, of any desired shape or size. This chamber is denominated the "grease -chamber," because it is filled with any desired lubricant, and this is preferably done through the aperture f in its base, which aperture is suitably closed by a plug, cover, or screw -cap, f', or the filling- aperture may be at the side. In some forms of construction it may be found desirable to fill this chamber through the screw-hole in the top, the chamber being otherwise closed.
Claim:
A lifting jack of otherwise ordinary construction, provided with a grease or lubricating chamber wherein the lower end of the screw works. |
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