Patent ID: 9528556
Filing Date: 2016-12-27
CPC Classification: F16D,F16F

Claim Text:
1. A multiple natural frequency coupling apparatus for rotatably connecting a rotatable driving member to a rotatable driven member of a drive line, comprising: a substantially cylindrical housing having a longitudinal axis; a substantially cylindrical rigid outer shaft coaxially aligned with said longitudinal axis and connected to said housing; a substantially cylindrical inner shaft coaxially aligned with said longitudinal axis and having a torsional stiffness about said longitudinal axis different than said outer shaft; a substantially cylindrical fluid chuck housing coaxially aligned with said longitudinal axis and connected to said inner shaft; and a substantially cylindrical collapsible sleeve coaxially aligned with said longitudinal axis and disposed between said fluid chuck housing and said outer shaft, wherein said collapsible sleeve may move between a non-actuated position, wherein said collapsible sleeve does not engage said outer shaft thereby providing a first torsional stiffness of said coupling apparatus corresponding to a first natural frequency when said inner shaft is rotatably driven, and an actuated position, wherein said collapsible sleeve engages said outer shaft thereby providing a second torsional stiffness of said coupling apparatus corresponding to a second natural frequency when said outer shaft is rotatably driven.