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    • 1. 发明申请
    • PIPE CUTTER
    • 管道切割机
    • US20140182137A1
    • 2014-07-03
    • US13393149
    • 2009-08-28
    • Zheng Wei LiuKe Hui TangRong ChenMichael NaughtonJohn Scott
    • Zheng Wei LiuKe Hui TangRong ChenMichael NaughtonJohn Scott
    • B23D21/10
    • B23D21/10B23D17/02B23D21/00B23D21/06B23D29/02B25F3/00B25F5/02
    • A power tool includes a pipe holder, a knife pivotally coupled to the pipe holder, and a drive mechanism coupled to at least one of the pipe holder and the knife. The knife includes a cutting edge having a first portion, a second portion, and an included angle, such as an obtuse angle, between the first portion and the second portion. The first portion of the cutting edge has a first length, and the second portion of the cutting edge has a second length. The drive mechanism is operable to move the at least one of the pipe holder and the knife relative to the other of the pipe holder and the knife. The power tool also includes a motor coupled to the drive mechanism and a power supply electrically coupled to the motor to selectively power the motor for operating the drive mechanism.
    • 电动工具包括管支架,可枢转地联接到管保持器的刀和连接到管支架和刀的至少一个的驱动机构。 刀包括在第一部分和第二部分之间具有第一部分,第二部分和诸如钝角的夹角的切割刃。 切削刃的第一部分具有第一长度,并且切削刃的第二部分具有第二长度。 驱动机构可操作以相对于管支架和刀的另一个移动管支架和刀中的至少一个。 电动工具还包括耦合到驱动机构的电动机和电耦合到电动机的电源,以选择性地为电动机供电以操作驱动机构。
    • 5. 发明申请
    • Wideband Frequency Tunable Ring Resonator
    • 宽带可调谐振铃谐振器
    • US20120256710A1
    • 2012-10-11
    • US13239426
    • 2011-09-22
    • Jian Xin CHENLi Heng ZhouHui TangZhi Hua BaoYong Jie YangQuan Xue
    • Jian Xin CHENLi Heng ZhouHui TangZhi Hua BaoYong Jie YangQuan Xue
    • H01P7/08
    • H01P7/088
    • The present invention provides a wideband frequency tunable ring resonator, wherein, comprises a closed λg/2 transmission line and two variable capacitors with tunable capacitance, the λg/2 transmission line is axisymmetric around a central line, first ends of the two variable capacitors are respectively connected to two intersection points of the λg/2 transmission line and the central line, the second ends of the two variable capacitors are respectively grounded. By implementing the technical solution of present invention, following technical effects are obtained. The fundamental resonant frequency (ffund) can be shifted up and down by controlling the respective values of the two loading capacitors, resulting in a bi-directional tuning of ffund. As a result, the tuning range of this invention can be approximately doubled as compared with the conventional tunable ring resonator.
    • 本发明提供一种宽带频率可调环形谐振器,其中包括一个闭合的λg/ 2传输线和两个具有可调电容的可变电容器,λg/ 2传输线围绕中心线是轴对称的,两个可变电容器的第一端 分别连接到λg/ 2传输线和中心线的两个交点,两个可变电容器的第二端分别接地。 通过实施本发明的技术方案,获得以下技术效果。 通过控制两个负载电容器的相应值,基本谐振频率(ffund)可以上下移动,从而导致ffund的双向调谐。 结果,与传统的可调环谐振器相比,本发明的调谐范围可以大致加倍。