System for changing and cleaning blowing plates in core blowing machines

A system for changing and cleaning blowing plates in core blowing machines, comprising a fixed support;

• a lower platform which is vertically displaceable with respect to said fixed support by means of a pair of vertical guides mounted to said support, a top platform which is laterally pivotally connected to the lower platform at one of its marginal areas so as to swing between a first horizontal position in which said top and lower platforms are superposed, and a second position in which said top platform is pivoted away from said lower platform, said top platform when in said horizontal position resting on a shock absorbent abutment provided on said lower platform;
• a double catch pivotally connected to said lower platform in an area opposite to said one of its marginal areas for blocking said top and lower platform to each other, said top platform having a bottom base provided with a first abutment, said fixed support being provided with a second abutment, means for actuating said double catch to pivot between two operating positions one of which is a blocking position for blocking said top and lower platform with one another and in which said double catch engages with said first abutment, and another position in which said catch is released from said first abutment and engages with said second abutment so as to permit said top platform to swing with respect to said lower platform, said swinging of said top platform being effected by a single driving hydraulic cylinder positioned between said fixed support and said top platform and extending through said lower platform towards said top platform, said hydraulic cylinder causing said top and lower platform to rise and descend together when said double catch blocks said platforms together and causing said swinging of said top platform when said double catch releases said top platform and engages said lower platform.