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公开(公告)号：USD385564S
公开(公告)日：1997-10-28
申请号：US52093
申请日：1996-03-22
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公开(公告)号：US5173715A
公开(公告)日：1992-12-22
申请号：US714192
申请日：1991-06-12
CPC分类号： H01Q21/26 , H01Q21/205
摘要： An antenna comprises a base plate forming a ground plane, a coaxial feed serving as a mast connected to the base plate and extending along an axis that is normal to the ground plane, and two orthogonal dipoles each formed of two elements. Each dipole element has a first end connected to and supported by the mast at a first location spaced apart from the ground plane by a predetermined distance and a second end closer to the ground plane and exhibits a curvature in a plane containing the mast.
摘要翻译： 天线包括形成接地平面的基板，用作连接到基板并沿着垂直于接地平面的轴延伸的桅杆的同轴馈电，以及由两个元件形成的两个正交偶极子。 每个偶极元件具有在与接地平面隔开预定距离的第一位置处连接并由桅杆支撑的第一端，并且靠近接地平面的第二端并且在包含桅杆的平面中呈现曲率。
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公开(公告)号：US6076266A
公开(公告)日：2000-06-20
申请号：US160387
申请日：1998-09-24
CPC分类号： G01C1/02 , Y10T74/19575 , Y10T74/19828
摘要： A theodolite that includes a stand, a telescope, a friction gear and a worm gear. The telescope is pivotally secured to the stand. The clutch plate is secured to the telescope for at least limited rotational movement upon pivoting of the telescope. The friction gear is mounted for rotation about substantially the same axis as rotation of the clutch plate. The worm gear is mounted to the stand and is in constant mesh with the friction gear so that rotation of the worm gear causes rotation of the friction gear. A device engages the friction gear with the clutch plate with a frictional force. The frictional force is adjustable to allow for adjustment of the telescope separately from the worm gear.
摘要翻译： 经纬仪包括一个支架，一个望远镜，一个摩擦齿轮和一个蜗轮。 望远镜枢轴固定在支架上。 当望远镜枢转时，离合器板固定到望远镜上至少有限的旋转运动。 摩擦齿轮安装成绕离合器盘的旋转大致相同的轴线旋转。 蜗轮安装到支架上，与摩擦齿轮保持一定的啮合，使得蜗轮的旋转引起摩擦齿轮的旋转。 装置以摩擦力将摩擦齿轮与离合器片接合。 摩擦力是可调节的，以允许与蜗轮分开地调节望远镜。
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