GB Patent: GB-181,804,245
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| Certain improvements in the steam engine
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Patentee:
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| William Church (exact or similar names) - Finsbury Square, London, England |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Granted: |
Apr. 08, 1818 |
Espacenet patent
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Jeff Joslin
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Description: |
| From Abridgments of Specifications Relating to the Steam Engine, Part I Vol. I: "The inner cylinder, or 'piston wheel' revolves; and two pistons are fixed on it, between the steam and eduction valves. Two 'slides,' or abutment valves, are moved across the steam chamber, from grooves cut through the ends of the outer cylinder. When withdrawn, the grooves are 'filled and rendered flush' for the passage of the piston, by 'narrow projections or legs.' The groove is furnished with a 'shutter' attached to a handle, by which a communication between the steam chambers, formed by the slides and pistons, may be opened. The condenser, air pump, and valves, are worked by mechanism, on the hollow axle prolonged. The steam is introduced, and discharged, through the axle, and its admission into the space between an abutment valve and piston, initiates the rotary motion."2. Describes a modification of the engine to work with high-pressure steam. Two 'piston wheels' are placed on the same hollow axle; the larger about four times the size of the smaller. Steam from the boiler enters the hollow axle, and thence between a slide and a revolving piston of the smaller wheel, and propels the piston through a portion of a circle. The action of a tappet on the slide then changing the communication, the steam rushes back through the channels by which it entered, passes in to the larger piston wheel chamber, and there, from its expansive force, propels the piston, and is then suffered to escape through the hollow axle into the atmosphere. By repetition of this process an alternate motion is obtained, first of the smaller and then of the larger piston wheels; and by the introduction of another pair of pistons to each chamber (steam wheel) alternating their motion with the former, action is kept up in both chambers, by one pair of pistons moving while one pair is at rest. The alternate motion of the piston is made to produce a regular rotation of the fly shaft by means of palls and rockets (ratchets) which are so interposed as to communicate every motion in the right direction to the shaft."3. Describes 'a piston, which, by means of certain movable 'parts and a screw, may be pressed outwards so as to compensate 'by expansion of size for the wearing of surface.'"4. Improvement in boilers by using sheet iron formed into a series of cylinders, having their edges flanged or shouldered alternately inwards and outwards, and placed with the inner flange or shoulder of one overlapping and enclosing the outer flange or shoulder of the next, and done while hot that it may be assisted by the contraction in cooling, and brazed at the joints to be secure without rivets." |
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