US Patent: 1,284,439
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| Method of Making Piston Rings
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Patentees:
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| Howard A. Pedrick (exact or similar names) - Bala, Montgomery County, PA |
| George F. Kolb (exact or similar names) - Philadelphia, PA |
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Patent Dates:
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| Applied: |
Aug. 23, 1916 |
| Granted: |
Nov. 12, 1918 |
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Patent Pictures:
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Joel Havens
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Description: |
| Abstract:
As a result of considerable experiment we have found that a cast iron piston ring which throughout its periphery exerts a uniform pressure against the cylinder wall will upon release from such cylinder, assume a shape determined by the laws of beams under load. Conversely, we have found that if a ring be formed with such a shape as that above indicated, it will, when placed in an engine cylinder, exert a pressure which is uniform at all points of its periphery. Also if a split circular ring is acted on throughout its periphery by uniform outward radial pressures, the shape which it will then assume is that which a ring must possess if it is to assume a circular form when acted upon by inward radial pressures.
Claim:
The method of making a piston ring which consists in expanding a split circular ring by the application of uniform radial pressures thereto; and thereafter treating it to set the material of the ring to cause it to retain said expanded form. |
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