Vibration generator

Vibration generator, particularly for vibratory conveyors and screens, comprising a motor having a rotary output shaft whose revolutions are variable and include a range of revolutions having a lower and an upper limit;

• a first element, constituting a first imbalanced mass, fixedly mounted on said output shaft for rotation therewith and including an elongated wedge-shaped body having a tip and an end portion remote from said tip said end portion being provided with a bore in which said output shaft is received and said wedge-shaped body having flanking surfaces which converge from said end portion toward said tip;
• a second element, constituting a second imbalanced mass, proximal to said first element and being displaceable relative to the same under the influence of centrifugal forces in direction substantially radially outwardly from said shaft to a series of positions in each of which said generator produces usable vibrations of a different magnitude, said second element being of substantially C-shaped outline and formed with cut-out which straddles said output shaft and in which said first element is received with clearance;
• and elastomeric means connecting said elements with one another and operative for yieldably restraining said second element against displacement to said positions while the revolutions of said output shaft are below said lower limit.

Vibration generator, particularly for vibratory conveyors and screens, comprising a motor having a rotary output shaft whose revolutions are variable and include a range of revolutions having a lower and an upper limit;

• a first element, constituting a first imbalanced mass, fixedly mounted on said output shaft for rotation therewith;
• a second element, constituting a second imbalanced mass, formed with the cutout in which said first element is substantially received so as to be straddled by said second element proximal thereto and being displaceable relative to said first element under the influence of centrifugal forces in direction substantially radially outwardly from said shaft to a series of positions in each of which said generator produces usable vibrations of a different magnitude;
• and elastomeric means substantially received in said cutout and straddled by said second element and operative for connecting said elements with one another and for yieldably restraining said second element against displacement to said positions while the revolutions of said output shaft are below said lower limit, said elastomeric means having an edge region located at an open side of said cutout and formed with at least one kerf of semi-circular cross section which extends substantially paralle to the axis of rotation of said shaft.

Vibration generator, particularly for vibratory conveyors and screens, comprising a motor having a rotary output shaft whose revolutions are variable and include a range of revolutions having a lower and an upper limit;

• a first element, constituting a first imbalanced mass, fixedly mounted on said output shaft for rotation therewith;
• a second element, constituting a second imbalanced mass, proximal to said first element and being displaceable relative to the same under the influence of centrifugal forces in direction substantially radially outwardly from said shaft to a series of positions in each of which said generator produces vibrations of a different magnitude, said second element having a center of gravity outwardly spaced from said shaft;
• and elastomeric means connecting said elements which one another and operative for yieldably restraining said second element against displacement to said positions while the revolution of said output shaft are below said lower limit, said elastomeric means also having a center of gravity coinciding with said center of gravity of said second element when said shaft is standing still.