公开(公告)号：US6120022A

公开(公告)日：2000-09-19

申请号：US178376

申请日：1998-10-23

申请人： William T. Stokes

发明人： William T. Stokes

IPC分类号： A63F9/00 ,  A63F11/00 ,  A63B71/00

CPC分类号： A63F11/0011 ,  A63F2011/0016

摘要： A spinner for randomly selecting a number has a very low friction bearing between a transparent spinner member and a transparent base plate. In one embodiment the base and spinner are formed of a transparent plastic such as Plexiglas, with a cone point set screw mounted in a threaded hole of the base plate and providing a narrow point for seating of the spinner member. A transparency with annularly arranged numbers may be placed at the bottom side of the transparent base plate, and different numerical arrays or symbol arrays may be selected. The spinner member has a central hole fitted with a central hub that has a recess formed into an internal cone shaped apex. The cone angle of the set screw point is steeper than that in the apex of the hub recess, so that the spinner member rests essentially only on the narrow point of the set screw. When the number selector device is placed on an overhead projector, as in a classroom setting, a gentle turn of the spinner member will generate five or ten revolutions of the spinner arrow, which gradually comes to a stop in the random selection of a number or symbol.

摘要翻译： 用于随机选择数字的旋转器在透明旋转构件和透明基板之间具有非常低的摩擦力。 在一个实施例中，基部和旋转器由诸如有机玻璃的透明塑料形成，锥形固定螺钉安装在基板的螺纹孔中，并提供用于旋转构件的放置的狭窄点。 可以在透明基板的底侧放置具有环形布置数量的透明体，并且可以选择不同的数字阵列或符号阵列。 旋转构件具有装配有中心毂的中心孔，该中心毂具有形成为内锥形顶点的凹部。 固定螺钉点的锥角比轮毂凹部顶点的锥角更陡，使得旋转体构件基本上仅在定位螺钉的狭窄位置上。 当数字选择器装置放置在高架投影仪上时，如在教室设置中，旋转器构件的平缓转动将产生五转或十转的旋转箭头，其逐渐停止在随机选择的数字或 符号。

公开(公告)号：USD588476S1

公开(公告)日：2009-03-17

申请号：US29310067

申请日：2008-07-23

申请人： James E. Wehrly

设计人： James E. Wehrly