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    • 9. 发明授权
    • Dual frequency distance measuring system
    • 双频测距系统
    • US4283726A
    • 1981-08-11
    • US939810
    • 1978-09-05
    • Lewis C. SpenceStephen Martin
    • Lewis C. SpenceStephen Martin
    • G01S5/14G01S11/08G01S19/48G01S5/06
    • G01S5/14G01S11/08
    • A radio frequency distance measuring system and method where two continuous wave carrier signals, derived from a stable frequency source, are radiated from a known reference point. The frequency of the first continuous wave carrier signal is displaced from the frequency of the second continuous wave carrier signal by a selected difference frequency. When received at the unknown point, the two continuous wave carrier signals are mixed to provide a difference or beat frequency marker signal, delayed in arrival at the unknown point from the known point by the speed of light. A locally generated marker signal is derived from a stable frequency source at the unknown point, and has the same frequency as the difference frequency signal. The leading or trailing edge of the difference frequency signal can be compared with the locally generated marker signal, and the time difference or phase difference between them can be displayed using a phase meter or time interval indicator and corresponds to determine directly the distance between the known transmitter reference point and the unknown receiver point. Multiple known reference point transmitters, each transmitting two continuous wave carrier signals displaced in frequency by a selected difference frequency, can be used to obtain two or more distance measurements at the unknown point to determine the position of the unknown receive point with respect to the known transmitter points. A chart shows the relationship of the selected difference frequency to the distance that can be measured without ambiguity.
    • 一种射频距离测量系统和方法,其中从稳定频率源导出的两个连续波载波信号从已知参考点辐射。 第一连续波载波信号的频率从第二连续波载波信号的频率偏移选定的差频。 当在未知点被接收时,将两个连续的波载波信号混合以提供差分或拍频信号,从已知点以光速延迟到达未知点。 本地产生的标记信号从未知点的稳定频率源导出,并且具有与差分频率信号相同的频率。 可以将差频信号的前沿或后沿与本地产生的标记信号进行比较,并且可以使用相位计或时间间隔指示器显示它们之间的时间差或相位差,并且对应于直接确定已知的 发射机参考点和未知接收点。 可以使用多个已知的参考点发射机,每个发射机在频率上以选定的差频率发射两个连续波载波信号,以在未知点获得两个或更多的距离测量值,以确定未知接收点相对于已知的位置 发射点。 图表显示所选择的差异频率与可以测量的距离之间的关系,不明确。
    • 10. 发明授权
    • Steel rotor with hardened fibre collecting groove and method of
manufacture thereof
    • 具有硬化纤维集合槽的钢转子及其制造方法
    • US4167846A
    • 1979-09-18
    • US879913
    • 1978-02-22
    • Jack ShawJohn WhiteleyStephen Martin
    • Jack ShawJohn WhiteleyStephen Martin
    • D01H4/10D01H1/12C21D9/00
    • D01H4/10Y10S148/902
    • Disclosed is a method of manufacture of a rotor for the open end spinning of staple fibres into yarn which is formed of a steel and has hardened surfaces at its fiber contacting and collecting surfaces, wherein the rotor may be fashioned by machining from a block of steel or formed from sheet steel, then hardening its internal fiber contacting surfaces by induction heating or carburizing or nitriding or carbonitriding at least in the region of the rotor's maximum diameter, then quenching and thereafter stress-relieving the entire rotor. Such method provides a rotor with exceptional properties of wear resistance in the area most prone to abrasive wear which latter otherwise reduces the rotor's useful service life and substantially increases yarn processing costs.
    • 公开了一种制造转子的方法,该转子用于将短纤维开口纺丝成由钢形成的纱线,并且在其纤维接触和收集表面处具有硬化表面,其中转子可以通过来自钢块的机械加工 或由钢板形成,然后通过至少在转子最大直径的区域中的感应加热或渗碳或氮化或碳氮共渗来硬化其内部纤维接触表面,然后淬火,然后使整个转子减轻应力。 这种方法提供了转子在最容易磨损的区域中具有优异的耐磨性能,否则会降低转子的有用使用寿命并显着提高纱线加工成本。