Platform vibration generator
A vibrator comprises an upper, lightweight, honeycomb rocker plate suspended above a rigid, lower base by a pair of triangular truss rocker arms. A pair of rigid, parallel, spaced-apart stringers within the vibrator rise upwardly from the lower base. A rocker shaft extending between the stringers pivots the rocker arms near their midpoint. A motor secured to the base within the vibrator drives a spaced-apart flywheel assembly that is mounted with a crankshaft journaled between the stringers. The motor is coupled to the flywheel assembly with a drive belt extending between suitable pulleys. The flywheel assembly crankshaft terminates in spaced apart, offset portions that reciprocate connecting rods linked to one end of the triangular truss rocker arms that vigorously vibrate the rocker plate.
1. A platform vibrator adapted to provide firm, sustained vibration, the platform vibrator comprising:
a generally planar base adapted to be disposed upon a supporting surface;
a generally planar rocker plate disposed above said generally planar base;
a pair of spaced apart, rigid triangular truss rocker arms that support said generally planar rocker plate;
a flywheel assembly;
a motor for driving said flywheel assembly to operate said vibrator;
a rocker shaft for pivoting the triangular truss rocker arms;
the triangular truss rocker arms each comprising a reinforced center boss that rotatably receives the rocker shaft;
an elongated crankshaft supporting and rotating the flywheel assembly;
connecting rod means for connecting said elongated crankshaft to said triangular truss rocker arms;
a pair of rigid, parallel stringers disposed upon said generally planar base and rising vertically therefrom; and,
wherein the rocker shaft is rotatably secured between said pair of stringers within rotation-enabling cradles defined in tops of the stringers.
2. The platform vibrator as defined in claim 1 further comprising an upright, encircling, skirt supported peripherally about the generally planar base forming an enclosure.
3. The platform vibrator as defined in claim 2 wherein the triangular truss rocker arms each have a single driven end coupled to said connecting rod means.
4. The platform vibrator as defined in claim 3 wherein each triangular truss rocker arm driven end comprises a pair of spaced-apart rocker arm hubs that pivotally receive said connecting rod means.
5. The platform vibrator as defined in claim 4 wherein the elongated crankshaft terminates at a pair of opposite ends in eccentric stubs for reciprocating the connecting rods and driving the triangular truss rocker arms.
6. The platform vibrator as defined in claim 1 wherein the generally planar rocker plate rests upon resilient strips disposed on a top of each triangular truss rocker arm.
7. The platform vibrator as defined in claim 6 wherein the rocker arms have an inverted isosceles triangle shape.
8. A platform vibrator adapted to provide firm, sustained vibration, the platform vibrator comprising:
a rigid, generally planar base adapted to be disposed upon a supporting surface;
a pair of rigid, spaced apart, parallel stringers disposed upon said generally planar base that rise vertically therefrom;
a rigid, generally planar rocker plate disposed above said pair of stringers and said generally planar base;
a pair of spaced apart, rigid triangular truss rocker arms that support said generally planar rocker plate;
a flywheel assembly;
a motor for driving said flywheel assembly to operate said vibrator;
a transversely mounted rocker shaft extending between said pair of stringers that pivots the triangular truss rocker arms;
an elongated crankshaft supporting and rotating the flywheel assembly, the crankshaft comprising integral, spaced-apart trunnions defined on each end that are rotatably supported within rotation-enabling bearings received within opposite, supporting cradles formed in said pair of stringers;
connecting rod means for connecting said elongated crankshaft to said triangular truss rocker arms; and,
wherein the crankshaft comprises eccentric stubs proximate said trunnions for reciprocating the connecting rod means and driving the triangular truss rocker arms to vibrate said generally planar rocker plate.
9. The platform vibrator as defined in claim 8 wherein:
each triangular truss rocker arm has a single driven end; and,
each triangular truss rocker arm driven end comprises a pair of spaced-apart rocker arm hubs that pivotally receive said connecting rod means.
10. The platform vibrator as defined in claim 9 wherein the triangular truss rocker arms each have a reinforced center boss that rotatably receives the rocker shaft.
11. The platform vibrator as defined in claim 10 wherein the rocker shaft is secured to said pair of stringers within rotation-enabling cradles defined in tops of the pair of stringers.
12. The platform vibrator as defined in claim 8 wherein the triangular truss rocker arms have an inverted isosceles triangle shape.