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    • 6. 发明授权
    • Alarm system
    • 警报系统
    • US4356474A
    • 1982-10-26
    • US241268
    • 1981-03-06
    • Peter HumphriesPaul Aeberli
    • Peter HumphriesPaul Aeberli
    • G08B17/00G08B29/06G08B19/00
    • G08B17/00G08B29/06
    • A digital alarm system of the type having first and second electrically conductive loops connected by an alarm switch. The alarm switch is normally open, but can be closed when an alarm state exists to electrically short one loop to the other. Currents are generated in each of the loops for use in detecting either the closing of the alarm switch or the occurrence of a fault in one of the loops. Resistors are connected to each of the loops for use in detecting the presence or absence of the currents. A first pair of transistor switches alternatingly short-circuit one resistor then the other; and a second pair of transistor switches, synchronized with the first pair, alternatingly short the ends of one loop then those of the other so that when the alarm switch is closed the first pair of transistor switches simultaneously short-circuit both resistors even if a fault occurs anywhere in one of the loops. Recording devices, such as flip-flops, coupled to the resistors, record signals indicative of a magnitude of the resistor voltage drops during intervals in which the resistors are not short-circuited. Logic circuitry is then used to process this stored information to generate signals indicating whether the alarm switch has been tripped or whether a fault has occurred.
    • 一种具有通过报警开关连接的第一和第二导电回路的数字报警系统。 报警开关是常开的,但是当有一个报警状态存在电一个回路到另一个回路时可以关闭。 在每个回路中产生电流,用于检测报警开关的关闭或其中一个回路中发生故障。 电阻器连接到每个回路以用于检测电流的存在或不存在。 第一对晶体管开关交替地使一个电阻器短路另一个; 以及与第一对同步的第二对晶体管开关交替地将一个环路的端部交替地短路,使得当报警开关闭合时,第一对晶体管开关同时使两个电阻器短路,即使是故障 发生在其中一个循环中的任何位置。 耦合到电阻器的诸如触发器的记录装置在电阻器不短路的间隔期间记录指示电阻器电压下降幅度的信号。 然后使用逻辑电路来处理该存储的信息以产生指示报警开关是否已跳闸或是否发生故障的信号。
    • 8. 发明授权
    • Process for forming tubular components
    • 用于形成管状部件的方法
    • US06651477B2
    • 2003-11-25
    • US09368775
    • 1999-08-05
    • Peter HumphriesAlexander Mark DuffSimon Jonathan Giles Griffiths
    • Peter HumphriesAlexander Mark DuffSimon Jonathan Giles Griffiths
    • B21D4102
    • B21D53/88B21D41/02B62D25/145
    • A process of producing from an elongate tube a tubular structural component having a first longitudinal section integrally connected to a second longitudinal section, the second section being located at the end of the tube and being of a desired cross-sectional shape and size, the cross-sectional size of the second section being greater than that of the first section, the process including selecting a mandrel having a cross-sectional shape and size corresponding to the second section, relatively axially feeding said end of the tube over the mandrel in order to form said second section, the choice of the size of mandrel and the rate of feed and the axial pressure applied to said tube being controlled such that the wall thickness of the second section is on average at least 70 percent of the average wall thickness of the first wall section.
    • 一种从细长管制造的管状结构部件,其具有与第二纵向部分整体连接的第一纵向部分,第二部分位于管的端部并且具有期望的横截面形状和尺寸,十字形 所述第二部分的尺寸大于所述第一部分的尺寸,所述方法包括选择具有对应于所述第二部分的横截面形状和尺寸的心轴,将所述管的所述端部相对轴向地馈送在所述心轴上,以便于 形成所述第二部分,选择心轴的尺寸以及施加到所述管的进料速率和轴向压力被控制,使得第二部分的壁厚度平均为平均壁厚的至少70% 第一个墙段。