单臂残疾人升旗装置

Description

本作品由旗杆、定滑轮、旗帜、绳、橡筋、桩头和三个孔绳盒、重物组成。残疾人只要单手来回拉动旗绳，利用摩擦力和橡筋弹力的原理。
只要用一只手拉动绳子下端，适合单臂残疾的学生，一紧一松，旗子就会向上升起，这是利用了静摩擦和杠杆的原理。绳子不拉时由于静摩擦力，旗子不动，拉动绳子时杠杆作用使旗子爬升。松绳时另一侧的皮筋的弹力再次利用杠杆，使旗子再次爬升。静止时绳子与圆环的三个小眼由于皮筋的弹力加大了静摩擦力，保持静止，不下滑。反反复复拉动，就能将旗帜升到顶端，最后把绳子绕在旗杆下面的桩头上固定住就可以了。
降落时，只要用一只手把绳从桩头上解开，由于三个孔绳盒中装有重物，旗子就能够自由下落。方便单臂残疾人的升旗与降旗，实用性强。

This works is made of flagpole, fixed pulley, flag, rope, elastic, pile crown and three hole twine carriers, weights. As long as disabled person's one hand pulls halyard back and forth, the principle of frictional force and elastic elastic force is utilized.
As long as pulling the sub- lower end of running rope with one, it is suitble to the student of single armed deformity, a tight pine, flag will be raised above, this is the principle that static friction and lever is utilized. Due to stiction when rope is not drawn, flag is motionless, and leverage makes flag climb when pulling rope. The elastic force of the rubber band of the other side utilizes lever again when slack rope, and flag is made to climb again. Three ommatidiums of rope and annulus increase stiction due to the elastic force of rubber band when static, remain stationary, do not glide. It again and again pulls, flag can be raised to top, finally rope is wound on fix on the pile crown below flagpole can.
When landing, as long as being unlocked from pile crown with a hand handle rope, due to being equipped with weight in three hole twine carriers, flag being capable of free-falling. Facilitate the flagraising of single armed disabled person and lowers flag, it is practical.