HERMETIC SEAL FOR DEVICES WITH LIMITED ROTATION

摘要

A hermetic seal (10) for a limited rotation device (12) includes a plurality of vertical convolutes (18) bonded to a device housing (16) at their respective first ends (19). At their respective second ends (21), plurality of the vertical convolutes (18) are bonded to a plurality of horizontal convolutes (20). The plurality of horizontal convolutes (20) are bonded to a device shaft (14) at an end opposite of the plurality of vertical convolutes (18). The plurality of vertical convolutes (18) stretch in order to provide limited rotation and the horizontal convolutes (20) expand or contract to accommodate length changes of the plurality of vertical convolutes (18). The hermetic seal (10) permits limited rotation while defining a barrier (26) and preventing viscous fluid leakage to an external environment.