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Apparatus for monitoring sewer cleaning tool extension

  • US 5,009,242 A
  • Filed: 09/12/1989
  • Issued: 04/23/1991
  • Est. Priority Date: 09/12/1989
  • Status: Expired due to Fees
First Claim
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1. A mobile sewer cleaning machine comprising:

  • an elongated sewer cleaning tool wound upon a reel mounted in a reel compartment of the machine;

    motor means coupled to said reel for rotating said reel;

    motor control means for operating said motor means in one direction to play out said tool into a sewer by unwinding it from said reel, and in the direction opposite to said one direction to retract said tool from said sewer by rewinding said tool onto said reel;

    movement signaling means coupled to said tool for generating signals representative of play out of said tool in defined incremental lengths and retraction of said tool in defined incremental lengths, said movement signaling means comprising;

    a rotatably mounted tool sensing drum which is frictionally engaged with and rotated by said tool and including a position indicator mounted thereto,two proximity sensors positioned to sense said position indicator as said drum is rotated, andswitch means coupled to said motor control means for activating one of said proximity sensors upon rotation of said motor means in said one direction and the other of said proximity sensors upon rotation of said motor means in said opposite direction;

    electronic counter means connected to said movement signaling means and responsive to said signals for displaying a count representative of the extent of said elongated sewer cleaning tool which has been unwound from said reel and/or rewound onto said reel, said electronic counter means including input means for selecting a desired count and output means for indicating when a desired count has been reached; and

    alarm means connected to the output means of said electronic counter means connected to the output means of said electronic counter means for generating an alarm signal upon reaching said desired count.

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