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Apparatus for controlling the activation and de-activation of a vacuum assembly connected to a conduit system

  • US 4,225,272 A
  • Filed: 02/08/1979
  • Issued: 09/30/1980
  • Est. Priority Date: 02/22/1978
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling the activation and de-activation of a vacuum assembly (3) which is connected to a conduit system (1), such as a suction conveyance system for a central cleaning system, in order to maintain a partial vacuum in the conduit system, said system being provided with suction sockets (4) which may be opened for coupling in vacuum-driven appliances (4a) and which are self-closing when said vacuum-driven appliances are disconnected, comprising a first sensing means (5, 7, 8, 9) operative to sense that state in which all of said suction sockets (4) are closed, in order to emit a stop signal to the vacuum assembly (3), and a second sensing means (11, 15, 16, 17) operative to sense the opening of one or more suction sockets (4) in order to emit a start signal to said vacuum assembly (3), said second sensing means (11, 15, 16, 17) including a fan unit (17) which is disposed to receive, as its start signal, the stop signal emitted to said vacuum assembly (3) in order, when said vacuum assembly (3) is closed, to maintain a certain partial vacuum in said conduit system (1), and an air-flow sensing device (11) which is operative to sense the air flow in said conduit system (1), which occurs when one or more suction sockets (4) in said conduit system (1) are opened, in order to actuate a switch (16) disposed in an electric circuit (15) in such a manner that a start signal is emitted to said vacuum assembly (3), said fan unit (17) being disposed to receive, as its stop signal, the start signal emitted to said vacuum assembly (3).

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