Use of an electrified pin to detect load transfer to a secondary nut in a screw actuator
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United States of America Patent
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Apr 8, 2008
Grant Date -
Jan 27, 2005
app pub date -
Sep 11, 2003
filing date -
Sep 11, 2002
priority date (Note) -
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Abstract
The invention relates to an actuator for actuating a moving member, said actuator essentially comprising a screw and at least two nuts engaged on the screw, relative movement between the screw and the nuts generating said actuation, said actuator further comprising a pin through which an electrical link passes, a force-transmitting element placed in the path of the force between the screw and the moving member via one of the nuts, and a mechanical extension of said force-transmitting element that extends to the vicinity of the other nut, the pin passing both through the mechanical extension and through an element coupled to the other nut so that any abnormal shift in the force-transmitting element relative to the screw results in shear between its mechanical extension and the element coupled to the other nut, causing the pin to break and causing the electrical link to be broken.
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