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51. 外观设计

USD371427S Vapor recovery fuel nozzle deflector 失效
公开(公告)号：USD371427S
公开(公告)日：1996-07-02
申请号：US35517
申请日：1995-03-01
申请人： David J. Harris , Thomas L. Claussen , John J. VanDaele
设计人： David J. Harris , Thomas L. Claussen , John J. VanDaele

52. 发明授权

US4506176A Comparator circuit 失效
标题翻译：比较器电路
公开(公告)号：US4506176A
公开(公告)日：1985-03-19
申请号：US382279
申请日：1982-05-26
申请人： David J. Harris
发明人： David J. Harris
IPC分类号： H03K19/0175 , G05B1/01 , H03K5/08 , H03K17/0412 , H03K17/60 , G06G7/12
CPC分类号： H03K17/603 , H03K17/04126
摘要： A comparator circuit is provided for producing a voltage across the base and collector electrodes of an output transistor to drive the output transistor to either a conducting condition, or a nonconducting condition, selectively in accordance with an input signal. A switching circuit, responsive to the input signal, is coupled between a current source and the base electrode of the output transistor for electrically coupling the current source to the base electrode of the output transistor when the output transistor is driving from the conducting condition to the nonconducting condition and for electrically decoupling the current source from the base electrode of the output transistor when such output transistor is driving from the nonconducting condition to the conducting condition. With such arrangement, when the switching circuit couples the current source to the base electrode of the output transistor, the current source provides a discharge circuit for base charge in the output transistor. Further, when the switching circuit decouples the current source from the base electrode of the output transistor, such current source is coupled to a resistor coupled between a voltage source and the base electrode of an active pull-up transistor. With such arrangement, the resistance of such resistor may be reduced thereby reducing the time constant associated with such resistor and the inherent capacitance of such active pull-up transistor.
摘要翻译：提供比较器电路，用于产生输出晶体管的基极和集电极两端的电压，以根据输入信号有选择地将输出晶体管驱动到导通条件或非导通条件。响应于输入信号的开关电路耦合在输出晶体管的电流源和基极之间，用于当输出晶体管从导通条件驱动时将电流源电耦合到输出晶体管的基极，当这种输出晶体管从非导通状态驱动到导通条件时，电流源与输出晶体管的基极电耦合。通过这种布置，当开关电路将电流源耦合到输出晶体管的基极时，电流源为输出晶体管中的基极电荷提供放电电路。此外，当开关电路将电流源与输出晶体管的基极分离时，该电流源耦合到耦合在电压源与有源上拉晶体管的基极之间的电阻。通过这种布置，可以减小这种电阻器的电阻，从而减少与这种电阻器相关联的时间常数和这种有源上拉晶体管的固有电容。

53. 发明授权

US4019832A Platform for a turbomachinery blade 失效
标题翻译：涡轮机叶片平台
公开(公告)号：US4019832A
公开(公告)日：1977-04-26
申请号：US661968
申请日：1976-02-27
申请人： Charles T. Salemme , Richard Ravenhall , David J. Harris
发明人： Charles T. Salemme , Richard Ravenhall , David J. Harris
IPC分类号： F01D5/30 , F01D11/00 , B64C11/06 , F01D7/00
CPC分类号： F01D11/008 , F01D5/30
摘要： A turbomachinery blade platform comprising a pair of complementary platform halves, each having an outer flow path defining shroud adapted to extend generally laterally of the blade. An inner flange on each platform half, also extending generally laterally of the blade, is retained in a cooperating slot formed within the support structure retaining the blade. A structural member extending between the shroud and the flange is contoured to conform to an overlapping wedging surface disposed about the blade airfoil surface. The platform is thus provided with redundant retention by both the blade and by the blade support structure.
摘要翻译：一种涡轮机械刀片平台，包括一对互补的平台半部，每个具有限定护罩的外部流动路径，所述外部流动路径适于大致横向延伸。每个平台一半上的内凸缘也大致横向延伸，保持在形成在保持叶片的支撑结构内的配合槽中。在护罩和凸缘之间延伸的结构构件成形为符合设置在叶片翼面表面周围的重叠楔形表面。因此，该平台由叶片和叶片支撑结构两者提供冗余的保持。

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