Machine element or mechanism – Mechanical movements – Rotary to or from reciprocating or oscillating
Patent
1980-05-27
1982-09-14
Staab, Lawrence J.
Machine element or mechanism
Mechanical movements
Rotary to or from reciprocating or oscillating
74573R, F16H 3300
Patent
active
043489125
ABSTRACT:
A vibratory apparatus comprises a shaft mounted for rotation about an axis and having weight structure mounted thereon to effect vibration in response to shaft rotation. The shaft may be initially balanced or unbalanced. According to one series of embodiments, a preloaded spring means maintains a primary weight structure in the relatively reduced eccentric position until a first predetermined magnitude of rotational shaft velocity is achieved. The primary weight structure thereafter moves outwardly against the force of the spring means with the spring means also moving to an eccentric position. At a higher, second predetermined magnitude the eccentricity of the primary weight structure and spring means is maximum. Until a higher, third predetermined magnitude of rotational shaft velocity, a secondary movable weight structure is retained in the relatively reduced eccentricity position by a preloaded spring means. The eccentricity of the secondary movable weight structure and spring means is increased until the shaft is substantially counterbalanced at a higher, fourth predetermined magnitude. By selecting the spring means biasing the secondary movable weight structure in the relatively reduced position, a predetermined range of rotational velocities may be selected between the third and fourth predetermined magnitude so that the amplitude of the apparatus may be selectively varied within the predetermined range. The center of mass of the respective spring means may be positioned substantially on the axis of rotation of the apparatus when the respective weight members are in the reduced eccentricity position to reduce the rotational inertia of the apparatus.
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