公开(公告)号：US3983923A

公开(公告)日：1976-10-05

申请号：US564143

申请日：1975-04-01

申请人： Giovan Battista Albenga

发明人： Giovan Battista Albenga

IPC分类号： B22C15/24 ,  B22C15/22

CPC分类号： B22C15/24

摘要： A sand blowing head includes an air accumulator above a tank in which a metered quantity of sand may be charged. The tank is charged when offset from the accumulator and is movable to a blowing position in which an upper tank inlet is aligned with a downwardly extending outlet from the accumulator. A seal between the inlet and outlet is provided.

公开(公告)号：US3983922A

公开(公告)日：1976-10-05

申请号：US570704

申请日：1975-04-23

申请人： Giovan Battista Albenga

发明人： Giovan Battista Albenga

IPC分类号： B22C9/12 ,  B22C7/06 ,  B22C13/08 ,  B22C15/24 ,  B22C17/00 ,  B22C17/08

CPC分类号： B22C7/067

摘要： A moulding process includes closing a multi-part die onto hollow-forming members to produce a hollow core mould. The mould is used in the "cold" process to produce a hardened foundry core about the cavity-forming members. Parting the die causes the cavity-forming members and the hardened core to be pivoted so that the hardened core rests on a conveyor belt with the longitudinal axes of the cavity forming members aligned with the longitudinal axis of the conveyor belt and with the cavity forming members lying in respective slots in a web fixed transverse to the conveyor belt. Subsequent movement of the conveyor belt causes the web to abut the hardened core and to extract the cavity-forming member from the hardened core as the hardened core is moved on the conveyor belt. In a modification of the process, the cavity forming members are partly extracted from the hardened core before the pivoting movement takes place. The apparatus used for the process has part of the die linked by a lost-motion mechanism to a bracket which carries the cavity forming members and which is pivotally mounted on two arms which are fixed on parallel bars which are slidably supported with respect to another part of the die. The parallel bars have helical springs to aid the movement of the other part of the die away from the hollow-forming members. The lost-motion mechanism is spring-biased to return the cavity forming members to a position between the die parts as they approach each other. The cavity forming members are axially movable with respect to the bracket by means of a hydraulic jack.