Abstract
X-screw, a load-sensitive linear actuator that we have proposed, has many desirable characteristics, but one drawback is that the linear motion is much slower than a conventional lead screw. When the axial load is small, the transmission efficiency of X-screw is approximately the same as that of a lead screw since the transmitted power is low in this case. Therefore we have developed a Dual Mode version of X-screw called ""DM X-screw"". This mechanism is able to automatically switch between lead screw mode and X-screw mode in response to the axial load. This feature makes it possible to apply DM X-screw to many mechanical systems. We have used this mechanism in a pantograph jack that makes use of its dual mode loadsensitive variable transmission properties. This jack can be operated with a small input force and unlike conventional jacks, several of these jacks can be used in combination to overcome the output force limitations of normal pantograph jacks.
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