公开(公告)号：US4060775A

公开(公告)日：1977-11-29

申请号：US707193

申请日：1976-07-21

申请人： Philippe Marie Allemandou ,  Didier Marcel Beaudet

发明人： Philippe Marie Allemandou ,  Didier Marcel Beaudet

IPC分类号： H03H9/46 ,  H03H9/50 ,  H03H9/02 ,  H03H9/24 ,  H03H9/26

CPC分类号： H03H9/50

摘要： A band-pass electromechanical filter, comprising an input electromechanical transducer, an output electromechanical transducer and a mechanical filter disposed therebetween, said filter having, alternately disposed, p resonators and (p - 1) coupling pins, resonating all in the longitudinal mode, wherein the coupling pins have identical diameters and lengths varied according to their respective position within said mechanical filter, said length being maximum in the middle of the filter and progressively decreasing towards the ends thereof.

摘要翻译： 一种带通机电滤波器，包括输入机电换能器，输出机电换能器和设置在其间的机械滤波器，所述滤波器具有交替布置的p个谐振器和（p-1）耦合引脚，以纵向模式共振，其中 连接销具有相同的直径和长度，根据其在所述机械过滤器内的相应位置而变化，所述长度在过滤器的中间是最大的，并且朝向其端部逐渐减小。

公开(公告)号：US3605943A

公开(公告)日：1971-09-20

申请号：US3605943D

申请日：1969-10-20

申请人： MARCEL BEAUDET ,  CYRILLE BLAIS

发明人： BEAUDET MARCEL ,  BLAIS CYRILLE

IPC分类号： E06C5/04 ,  E06C5/08

CPC分类号： E06C5/04

摘要： AN AERIAL LADDER WHICH IS POWER OPERATED FOR SWINGING AND TILTING MOVEMENT WITH RESPECT OF A BASE MOUNTING, SAID BASE MOUNTING SO DESIGNED AS TO HAVE A MINIUMUM HEIGHT AND THUS A VERY LOW CENTER OF GRAVITY, SUCH THAT THE BASE MOUNTING AND LADDER ARE ESPECIALLY ADAPTED TO BE MOUNTED ON THE ROOF OF A SMALL TRUCK, WHEREBY A PERSON STANDING AT THE END OF THE EXTENDED LADDER, WITH THE LADDER ORIENTED TRANSVERSELY OF THE TRUCK WILL NOT BE ABLE TO OVERTURN THE TRUCK EVEN IF THE LATTER HAS NO GROUND ENGAGING STABILIZERS.