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    • 6. 发明授权
    • Squirrel proof bird feeder
    • 松鼠饲养机
    • US07347162B2
    • 2008-03-25
    • US11137633
    • 2005-05-25
    • Mark ZieffJohn StoneDouglas F. Melville, Jr.
    • Mark ZieffJohn StoneDouglas F. Melville, Jr.
    • A01K61/02
    • A01K39/0113
    • A bird feeder provides a feed container extending downwardly, a limited support surface positioned around the feed container at a lower end thereof and having one or more feeding ports, the limited support surface being adapted for supporting a feeding animal in proximity to the one or more feeding ports, a biasing mechanism adapted for supporting the limited support surface at a lower end of the feed container and for allowing a limited amount of vertical movement of the limited support surface, and one or more portal shields affixed to the biasing mechanism and adapted to open and close the feeding ports, wherein the biasing mechanism is further adapted to open and close the feeding ports with the portal shields in response to the limited amount of vertical movement upwardly and downwardly, respectively, of the limited support surface.
    • 鸟饲料器提供向下延伸的进料容器,在其下端定位在进料容器周围的有限支撑表面,并且具有一个或多个进料口,该有限支撑表面适于将饲养动物支撑在靠近该一个或多个 馈送端口,偏置机构,其适于在所述进料容器的下端处支撑所述有限的支撑表面,并且用于允许所述受限支撑表面的有限量的垂直运动,以及固定到所述偏置机构的一个或多个门禁屏蔽件, 打开和关闭馈送端口,其中偏置机构还适于响应于有限支撑表面的向上和向下的有限的垂直运动量,利用门禁屏蔽来打开和关闭馈送端口。
    • 10. 发明授权
    • Control circuitry for viscosity sensors
    • 粘度传感器控制电路
    • US5054313A
    • 1991-10-08
    • US554285
    • 1990-07-17
    • John V. FitzgeraldTeresa M. WalshFrank J. MatusikJohn StoneEdmond DoughertyJohn Batton
    • John V. FitzgeraldTeresa M. WalshFrank J. MatusikJohn StoneEdmond DoughertyJohn Batton
    • G01N11/00G01N11/16
    • G01N11/16G01N2011/0006
    • Electronic control circuitry for obtaining precise inline process control data as to viscosity of fluids over a wide viscosity range, with high tolerance of ambient noise and vibration. An electromechanical transducer with an oscillating sensor is immersed in a flowing liquid, with the power required to sustain predetermined oscillation parameters being a measure of viscosity-density product. The gain of a variable gain amplifier which provides positive feedback to sustain oscillation is controlled in response to the integrated error signal output of a comparator which compares a DC value corresponding to the RMS amplitude of mechanical oscillation with a DC reference value. The monitoring of RMS amplitude rather than peak amplitude (as is done by a phase-sensitive sample-and-hold arrangement in the prior art), coupled integration of the error signal, results in a great improvement in immunity to ambient noise and vibration. Other features includes automatic calibration and temperature compensation whereby viscosity at a desired temperature can be determined even though the measurement is made at different temperature.
    • 电子控制电路,用于获得精确的在线过程控制数据,用于在宽粘度范围内具有高粘度的环境噪声和振动。 将具有振荡传感器的机电换能器浸入流动的液体中,以维持预定振荡参数所需的功率为粘度密度乘积的量度。 响应于将对应于机械振荡的RMS幅度的DC值与DC参考值进行比较的比较器的积分误差信号输出来控制提供正反馈以维持振荡的可变增益放大器的增益。 RMS振幅的监测而不是峰值幅度(如现有技术中的相敏采样保持装置所做的),误差信号的耦合积分导致对环境噪声和振动的抗扰度的极大改进。 其他特征包括自动校准和温度补偿,由此即使在不同温度下进行测量,也可以确定所需温度下的粘度。