Concrete block molding machine having continuously driven vibrating shaft mechanism which can be programmably vibrated and method of programmably vibrating such machines
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United States of America Patent
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Dec 18, 1990
Issued Date -
N/A
app pub date -
Feb 12, 1990
filing date -
Aug 1, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A concrete block molding machine has a vibratible mold box incorporating at least one molding cavity for a cement mixture which is to be densified in the cavity. A continuously driven shaft assembly mounts an eccentric fixed portion and a circumferentially adjustable balancing mass. The shaft assembly has a cylinder with a piston therein, connected to the mass to produce rotary motion of the mass relative to the fixed eccentric portion. A spring of predetermined rate opposes this. The pressure of the fluid introduced is varied to change the amplitude of the vibration imparted during each cycle.
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