| 摘要 |
An extensible frame having a pair of rigid end members disposed on a common axis and three articulated arms extending between the members in intersecting planes containing the common axis and hinged to the members in a manner which relative translational movement of the members toward and away from one another along the common axis and restrains the member against all other relative movement. The frame is capable of various uses such as supporting an object for horizontal or vertical movement, an adjustable instrument support, an erectable frame for a building structure, and others.
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