US Patent: 5,527X
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Bellows Tubs
Improvement in Bellows Tubs, or Cylinders, for Furnaces, or Forges
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Patentee:
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| Andrew A. (H.) McPharin (McPhaine) (exact or similar names) - Huntingdon, Huntingdon County, PA |
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| Not known to have been produced |
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Patent Dates:
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| Granted: |
Jun. 11, 1829 |
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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.
“The specification of this patent gives but a confused description of the invention; but the drawing is pretty well executed, and from this it appears that the part called the tub is a single cylinder, having a thick diaphragm in the middle, perforated in the centre, to allow a piston rod to pass through it, and having a double valve, closing a square hole, communicating with each division of the cylinder; between these valves, in the thickness of the diaphragm, a nozzle, or wind pipe, passes out through the side of the cylinder. The piston rod is worked by a crank, connected with a pitman, below the cylinder; upon the rod which passes through the diaphragm, there are two pistons, one above, and the other below it, each piston having a valve opening inwards. It is evident, therefore, that the action of the cylinder, with its double chamber, is analogous to that of the ordinary double bellows, but that it must have the defect of an entire, though momentary, stoppage of the blast at every return stroke. To obviate this, there is upon the wind pipe, a cylindrical chamber, with a weighted piston, to serve as a reservoir for the wind; the loaded piston acting like the upper board of the double bellows. In the wind pipe, there is a damper, which may be closed, or opened, to regulate the exit of the wind.
We do not perceive the superiority of this arrangement, to that of other cylindrical bellows, and are very apprehensive that this patent, like many others, has been obtained by one who is not acquainted with what has been elsewhere done in his own business. The common plan of three separate cylinders, which keep up a continued blast, seems to us to be altogether superior to the mode here proposed.”
Journal of the Franklin Institute Vol. 6, Sept. 1829 pgs. 184-185
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