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An Improved Visible Signalling Device applicable to the Mechanical Signalling Apparatus used in Mines and other Places.
An Improved Visible Signalling Device applicable to the Mechanical Signalling Apparatus used in Mines and other Places.
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机译:一种改进的可见信号装置,适用于矿山和其他地方的机械信号装置。
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摘要
104,967. Bell, W., and Briggs, R. May 23, 1916. Mechanical telegraphs; bell signals.- Relates to visible signalling-devices of the type comprising a marked dial over which moves a pointer operated by a toothed wheel which is rotated in a forward direction by a pawl actuated simultaneously with the audible signalling- apparatus, a second or retaining pawl controlled by a dash-pot or other timelag device being provided to prevent return of the toothed wheel when there is only a brief interval between two consecutive raps, but allowing return when the interval exceeds a certain amount. Both the pawl f actuating the wheel e of the pointer c, and the lever v actuating the dash-pot u are directly connected to a tail-piece or like member h on the pivot pin j of the usual rapper a. A " men " signal is provided, comprising a slide 6 adapted to register with an opening 7 in the dial b when three raps are given, the actuation being by an arm 10, on the pointer shaft d, which contacts with a lever 9 connected with the slide by a link 8. A spring- pressed catch 11 holds the lever 9 and slide 6 in the raised position till withdrawn by a contact arrangement as the cage passes certain points.
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