US Patent: 3,913,451
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| Hydraulic Cylinder with Cushioning Means
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Patentee:
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| David Ian McDonald (exact or similar names) - Cincinnati, Hamilton County, OH |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Aug. 30, 1974 |
| Granted: |
Oct. 21, 1975 |
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Joel Havens
"Vintage Machinery" entry for Cincinnati Milacron, Inc.
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Description: |
| Abstract:
A hydraulic cylinder-piston combination has a cushioning means for reducing velocity at the end of a stroke and is particularly applicable to the rod end of the cylinder where radial space on the packing nut or head may be at a premium for supporting an adequate cushioning means. The present cushioning means involves a pair of grooves separated by a land (inside one end of the cylinder head) and a ring on the piston rod. The ring and land hydraulically engage to form a restriction in the form of an annular passage. The grooves are, in turn, connected by obliquely or radially extending passageways with a check means therein. The arrangement compels hydraulic fluid to pass through the annular restriction formed by the ring and land when the two latter become hydraulically engaged near one end of the stroke but permit bypassing this restriction when the motion is reversed.
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