Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Proterial Ltd
Original Assignee
Hitachi Metals Ltd
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Filing date
Publication date
Application filed by Hitachi Metals LtdfiledCriticalHitachi Metals Ltd
Priority to JP16201287ApriorityCriticalpatent/JPS646559A/en
Publication of JPS646559ApublicationCriticalpatent/JPS646559A/en
PURPOSE:To reduce the weight and drastically prolong the service life by forming the teeth surface from a covering member made of erosionproof metal and integrally forming said covering member through the molding or injection using synthetic resin, in a sprocket wheel used in a sewage purification plant, etc. CONSTITUTION:A covering member 4 is made of erosionproof metal and extends between the adjacent teeth 2 and a tooth bottom 3 therebetween and is formed into a leg 4-1 having penetration holes 4-2 at both edges. The covering member 4 is prepared on the whole periphery of the cavity of a mold forming a sprocket wheel, particularly keeping a proper intervals between the adjacent covering members 4 on the tooth 2, by the injection molding of polyurethane resin. Therefore, the weight can be reduced, and the service life can be prolonged drastically, with an inexpensive structure.
COMPOSITES FOR INTERNAL DEMOLDERS, COMPOSITES CONTAINING ACTIVE HYDROGEN WITH COMPOSITES FOR INTERNAL DEMOLDERS AND A PROCESS FOR THE PREPARATION OF POLYURETHANE AND / OR MOLDED POLYURETH AND SIMILAR POLYMERS