公开(公告)号：US5543596A

公开(公告)日：1996-08-06

申请号：US291094

申请日：1994-08-16

申请人： Richard S. Jones ,  William H. Hodges, Jr. ,  Paul M. Evans

发明人： Richard S. Jones ,  William H. Hodges, Jr. ,  Paul M. Evans

IPC分类号： H01H19/62 ,  H01H3/42

CPC分类号： H01H19/62

摘要： A rotary switch operated by a cam having a lobe is disclosed. The cam is attached to a mechanism for rotation about the axis of the cam. A first switch contact member is positioned adjacent said cam and selectively makes electrical contact with a second switch contact member. The bracket attached to the first switch contact member contains a roller positioned adjacent to the cam for rotatably engaging the cam as the cam rotates. The roller is positioned with the bracket portion of the first contact such that the axis of the roller is movable from a first position to a second position as the switch changes from an open to closed or from a closed to open position. The bracket may contain an elongated slot which permits the axle of the roller to move within the slot as the switch changes modes. The slot preferably extends linearly and at an angle less than 45 degrees from a tangent line to the surface of said lobe adjacent the slope between said cam and said lobe. In preferred embodiments, 15 degree angles to the tangent are particularly advantageous. The switch is preferably operated in the main shaft in a highway crossing mechanism and is preferably used in the motor control circuit to drive the crossing arm upward.

摘要翻译： 公开了一种由具有凸角的凸轮操作的旋转开关。 凸轮附接到围绕凸轮的轴线旋转的机构。 第一开关接触构件邻近所述凸轮定位，并且选择性地与第二开关接触构件电接触。 附接到第一开关接触构件的支架包含邻近凸轮定位的辊，用于当凸轮旋转时可旋转地接合凸轮。 辊子与第一接触件的支架部分定位成使得当开关从打开状态切换到关闭状态或从关闭状态切换到打开位置时，辊子的轴线可以从第一位置移动到第二位置。 支架可能包含一个细长的槽，当开关改变模式时，允许辊的轴在槽内移动。 狭槽优选地线性地以与切线相对于所述凸角与所述凸角之间的斜面相邻的所述凸角的表面小于45度的角度延伸。 在优选实施例中，与切线成15度的角度是特别有利的。 该开关优选地在公路交叉机构的主轴上操作，并且优选地用于电动机控制电路中以向上驱动交叉臂。