| 摘要 |
PURPOSE: A length adjustable sleeve is provided to carry out simple and quick installation of a sleeve structure between a pair of form panels regardless of changes and errors in the interval between the panels. CONSTITUTION: A length adjustable sleeve(100) comprises an inner tube(110) and an outer tube(130) which are arranged between a pair of form panels(P1,P2). The inner tube has a straight guide groove(112) and a spiral guide groove(114) on the exterior surface. The outer tube has a guide projection(131) of certain height on the interior surface.
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