Vibration system for concrete pipe making machines

A vibration system for machines for making concrete products such as concrete pipes and the like, which machines utilize a mold that includes an outer mold and an inner mold that provide an annular space into which concrete is introduced to form the concrete product, said vibration system comprising:

• an inner mold having an inner surface that defines an interior space having a longitudinal axis;
• upper and lower bearing mounting plates spaced apart along the longitudinal axis of the interior space and secured to the inner mold;
• a coupling shaft bearing mounted on each of the bearing mounting plates;
• a coupling shaft supported by and turnable in the coupling shaft bearings and having upper and lower ends extending beyond the upper and lower mounting plates;
• a coupling hub fixed to each of the upper and lower ends of the coupling shaft;
• upper and lower vibrator mounting plates secured to the inner mold beyond the upper and lower ends, respectively, of the coupling shaft;
• an upper vibrator assembly that includes a drive motor mounted on the upper vibrator mounting plate and a lower vibrator assembly that includes a drive motor mounted on the lower vibrator mounting plate the upper and lower vibrator assemblies being positioned within the interior space of the inner mold;
• and
• upper and lower vibrator coupling hubs engageable with the respective coupling hubs at the upper and lower ends of the coupling shaft whereby the vibrator assemblies can be properly synchronized to run at the same speed and in the same direction.