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Pneumatic tube stop device and terminal

  • US 4,971,481 A
  • Filed: 02/10/1989
  • Issued: 11/20/1990
  • Est. Priority Date: 02/10/1989
  • Status: Expired due to Fees
First Claim
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1. A terminal for use in a pneumatic transmission system, said terminal comprising:

  • a pneumatic tube capable of transmitting a carrier using a stream of air produced by a pneumatic source, and said tube having an exhaust aperture and a shutoff aperture along its length, said exhaust aperture being positioned beyond said shutoff aperture along a designated path of travel for the carrier;

    a switch connected to the pneumatic source;

    sensing means in fluid communication with said shutoff aperture for sensing a pressure change in said aperture caused by the carrier'"'"'s movement past the shutoff aperture and activating said switch to shutoff the stream of air from the pneumatic source;

    a door defined within a portion of said tube;

    an end stop positioned within said tube at least one carrier'"'"'s length beyond said shutoff aperture; and

    catch means engaged with said sensing means for catching the carrier after the carrier'"'"'s impact with the end stop.

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