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发明名称
银幕收起装置
摘要
银幕收起装置,主要由筒体、空心轴和两端轴的支撑构成,筒体由铝合金挤压成内壁为圆形、外壁为正六边形、且在挤压中将正六边形的每个角挤压成凹形圆弧。本实用新型两个方案,一是用于大型银幕,在筒体的左端与空心轴连为一体装有一个可折叠的手摇把柄C。另一种方案是用于小型银幕,省掉了手摇把柄,在空心轴内装一个扭轴,其上套有弹簧,弹簧一端簧丝插在空心轴上,另一端则插在扭轴上,而扭轴是不转的,两种银幕收起装置结构紧凑,便于携带使用。
申请公布号
CN2032729U
申请公布日期
1989.02.15
申请号
CN88211654.1
申请日期
1988.04.18
申请人
无锡县东亭乡大厦银幕厂
发明人
倪海良;倪玉良;施兆忠
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
主权项
1、银幕收起装置,它包括筒体、空心轴及轴端支撑盖,其特征在于筒体14由铝合金挤压成内壁为园形而外壁成正六边形,正六边形每个顶角在挤压后呈凹形园弧22,该园弧顶点到筒体14内壁的厚度为筒体14内径的 1/45 ~ 1/55 ,并在筒体侧壁上开有一条55°~60°的切口。
地址
江苏省无锡县东亭乡大厦银幕厂
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