SWAY PREVENTION DEVICE FOR ELEVATING/LOWERING BLACKBOARD

摘要

PROBLEM TO BE SOLVED: To provide a means for surely preventing swaying incidental to writing in an overhanging part, in a side-long elevating/lowering blackboard that has a part overhanging to both right/left sides from a holding part by an elevating/lowering device.SOLUTION: An arm mounting frame 30 is fixed to an installation wall face W side opposing each right/left overhanging parts 1a of an elevating/lowering blackboard 1. In the arm mounting frame 30, a sway prevention arm 31 having at a free end part a roller 4 freely rotatable in a vertical plane, is pivoted at a base end part in a manner freely tiltable forward and backward. A locking means 5 is provided which untiltably fixes the sway prevention arm 31, in a state in which the roller 4 is in rolling contact with the rear side of the overhanging part 1a of the elevating/lowering blackboard 1.