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    • 31. 发明申请
    • Radio frequency process control
    • 射频过程控制
    • US20060091878A1
    • 2006-05-04
    • US11057788
    • 2005-01-06
    • David WilsonGeorge Noyes
    • David WilsonGeorge Noyes
    • G01S3/02
    • H01J37/32183H01J37/32082
    • A method and apparatus of providing and improving process controls when using RF power sources in medical, industrial, or scientific processes. A further improvement results in sampling RF energy in the fundamental frequency and its related harmonic frequencies. The process control employs sampling, splitting, filtering and subsequently measuring differences between the fundamental frequency amplitude and a reference frequency amplitude and furthermore measuring the difference between the fundamental frequency amplitude and each related harmonic. Data is further digitized, processed by one or more microprocessors, time stamped and sent to upstream control systems to enable process control.
    • 在医疗,工业或科学过程中使用RF电源时,提供和改进过程控制的方法和装置。 进一步的改进导致对基频和其相关谐波频率的RF能量进行采样。 过程控制采用采样,分频,滤波和随后测量基频振幅和基准频率幅度之间的差异,并进一步测量基频振幅和每个相关谐波之间的差异。 数据进一步数字化,由一个或多个微处理器处理,时间戳并发送到上游控制系统以实现过程控制。
    • 37. 发明申请
    • Elevated sign system with lowering mechanism to enable ground level servicing
    • 具有降低机构的高架标志系统,以实现地面服务
    • US20050188571A1
    • 2005-09-01
    • US10786020
    • 2004-02-26
    • David Wilson
    • David Wilson
    • G09F7/00G09F15/00G09F17/00
    • G09F17/00G09F15/0025
    • A sign system is provided. The sign system has a hoisting mechanism for moving a sign between an access or servicing position near ground level and an elevated display position. The sign system includes a first set of guide members and a second set of guide members and a drive system. Each guide member is generally tubular. The guide members of each set are connected together for telescopic movement. Each set of guide members includes an outermost guide member and an innermost guide member, one of which serves as an anchor guide member and the other of which serves as a sign supporting guide member. The sign supporting guide member includes at least one connector for connecting the sign thereto. The anchor guide members of the first and second sets of guide members are fixedly connectable in a generally vertical orientation to a wall or other vertical support means in horizontally spaced relation to each other such that the first and second sets of guide members are extendible downwards to move the sign to the access position and retractable upwards to move the sign to the display position. The drive system is operatively connected to the first and second sets of guide members for selectively moving the first and second sets of guide members between the extended position and the retracted position.
    • 提供了一个标志系统。 标志系统具有用于在接近地面附近的接近或维修位置和升高的显示位置之间移动标志的提升机构。 标志系统包括第一组引导构件和第二组引导构件和驱动系统。 每个引导构件通常是管状的。 每组的引导构件连接在一起用于伸缩运动。 每组引导构件包括最外面的引导构件和最内侧的引导构件,其中一个引导构件用作锚固导向构件,另一个用作标志支撑导向构件。 符号支撑引导构件包括至少一个用于将标志连接到其上的连接器。 第一组和第二组引导构件的锚定导向构件可以以大致垂直的方向固定地连接到彼此以水平间隔开的关系的壁或其他垂直支撑装置,使得第一组和第二组导向构件向下延伸到 将标志移动到进入位置并向上伸出,将标志移动到显示位置。 驱动系统可操作地连接到第一和第二组引导构件,用于在延伸位置和缩回位置之间选择性地移动第一和第二组引导构件。
    • 38. 发明申请
    • Method of cutting carbon and alloy steel
    • US20050109176A1
    • 2005-05-26
    • US10703264
    • 2003-11-07
    • David Wilson
    • David Wilson
    • B23D47/08B23D59/00B26D1/00
    • B23D59/001B23D47/08Y02P70/187Y10T83/04Y10T83/089Y10T83/148Y10T83/7788
    • The present invention discloses a method and apparatus for controlling the load on the blade or spindle motor of a steel-cutting saw for optimizing blade life, while at the same time reducing cutting cycle time and protecting the blade, gearbox and spindle hub from stresses caused by binding and jamming of the blade while cutting into a steel member. Using a programmable logic controller (PLC) to implement the method, the load current drawn by the spindle motor is sensed and compared to a reference value representing the desired optimum operating current. As the saw cuts through a steel member, variations in hardness cause the spindle motor current to fluctuate accordingly. The blade is advanced into the steel member by an electric servomotor. The rate of advancement of the blade is controlled by the PLC. As the current on the spindle motor increases, the PLC is programmed to reduce the rate of advancement of the blade, thereby reducing the load on the blade. The blade loading and spindle current are directly proportional. The rotational speed (RPM) of the blade is also maintained constant by a variable frequency motor drive that powers the spindle motor. The PLC does not vary the RPM of the blade. The operator selects the blade speed as a value in the range from 3 to 85 RPM, which is the reference value maintained by the variable frequency drive. The feed rate is the variable that is controlled by the PLC, by which the load current of the spindle motor is maintained relatively constant. The PLC also compares the current to a preset maximum value, normally around eighty percent of full load amps of the spindle motor. Upon reaching the preset maximum, the PLC removes the run command signal to the variable frequency drive, causing the spindle motor to stop abruptly. Response time for clearing an overload condition is approximately 10 milliseconds, or one-tenth of the time required to clear the overload using conventional analog current sensing and shut-off devices.