Key telephone system
    2.
    发明授权
    Key telephone system 失效
    关键电话系统

    公开(公告)号:US4572928A

    公开(公告)日:1986-02-25

    申请号:US550236

    申请日:1983-11-08

    IPC分类号: H04M9/00 H04Q5/18

    CPC分类号: H04M9/005

    摘要: In a key telephone system with a plurality of four-wire key telephone sets wherein a two-wire telephone set is connected to a main control device via a pair of speech lines so that intercom speech and office line speech are possible between the two-wire telephone set and other key telephone sets, the improvement wherein said main control device comprises a call signal generating circuit, first transfer switching means for transfer-connecting said speech lines between a pair of office speech lines and a pair of intercom speech lines, second transfer switching means for transfer-connecting said speech lines between said call signal generating circuit and said first transfer switching means, DC loop supervisory means for supervising a DC loop of said speech lines, and a control circuit inputted with an output of said DC loop supervisory means for controlling said first and second transfer switching means in accordance with the states of said office lines. Under a normal state the speech lines are connected to the intercom speech lines through the first and second transfer switching means. At the time of arrival of an office line call signal the second transfer switching means is switched to send the call signal to the speech lines. Thereafter the second transfer switching means is reset and the first transfer switching means is switched to the office line speech lines in accordance with the output of the loop supervisory means.

    摘要翻译: 在具有多个四线密钥电话机的密钥电话系统中,其中两线电话机经由一对语音线路连接到主控制装置,使得双线电话机之间可以进行对讲语音和办公线路语音 电话机和其他关键电话机,其中所述主控装置包括呼叫信号发生电路,第一传送切换装置,用于在一对办公语音线和一对对讲话音线之间传送连接所述语音线,第二传送 用于在所述呼叫信号发生电路和所述第一传送切换装置之间传送连接所述语音线路的切换装置,用于监视所述语音线路的DC环路的DC环路监控装置,以及输入所述DC循环监视装置的输出的控制电路 用于根据所述办公用线的状态来控制所述第一和第二传送切换装置。 在正常状态下,语音线路通过第一和第二传送切换装置连接到对讲语音线路。 在办公室呼叫信号到达时,切换第二传送切换装置以将呼叫信号发送到语音线路。 此后,第二传送切换装置被复位,并且第一传送切换装置根据环路监控装置的输出被切换到办公室线路语音线路。

    Golden sintered alloy for ornamental purpose
    3.
    发明授权
    Golden sintered alloy for ornamental purpose 失效
    金烧结合金用于观赏用途

    公开(公告)号:US4422874A

    公开(公告)日:1983-12-27

    申请号:US337223

    申请日:1982-01-06

    IPC分类号: C22C29/02 G04B37/22 B22F1/00

    CPC分类号: C22C29/02 G04B37/221

    摘要: The present invention relates to a method for producing golden sintered alloys for ornamental purposes and suitable for use in watches. They are mainly composed of 10-40 percent by weight of titanium nitride, 10-30 percent by weight of nickel and valanced niobium carbide. Less than 40 percent by weight of the nickel may be substituted by at least one member from the group of chromium, molybdenum, tungsten and titanium. The alloys have a high degree of hardness (Rockwell A scale), excellent corrosion resistance and a beautiful gold color.

    摘要翻译: 本发明涉及一种用于制造用于观赏用途并适用于手表的金黄色烧结合金的方法。 它们主要由10-40重量%的氮化钛,10-30重量%的镍和高价的碳化铌组成。 小于40重量%的镍可以被铬,钼,钨和钛组中的至少一个成员取代。 合金具有高硬度(Rockwell A等级),优异的耐腐蚀性和美丽的金色。