Riser sleeve
1. Field of the Invention A riser sleeve has a sleeve body and an evaporative pattern fit into the sleeve body to pass through a side wall thereof. The evaporative pattern is shaped to enable the casting, integrally with the riser cast by the sleeve body, of a projecting portion capable of receiving...
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| Format: | Patent |
| Sprache: | eng |
| Online-Zugang: | Volltext bestellen |
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| Zusammenfassung: | 1. Field of the Invention
A riser sleeve has a sleeve body and an evaporative pattern fit into the sleeve body to pass through a side wall thereof. The evaporative pattern is shaped to enable the casting, integrally with the riser cast by the sleeve body, of a projecting portion capable of receiving a wedge blade of an openable wedge blade type riser breaker. Even a top riser can therefore be broken off of the main casting at a neck portion by an opening force applied to the wedge blades of the riser breaker without the use of a special jig. |
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