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Vacuum extraction cleaning machine

  • US 4,194,262 A
  • Filed: 09/29/1978
  • Issued: 03/25/1980
  • Est. Priority Date: 09/29/1978
  • Status: Expired due to Term
First Claim
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1. A vacuum extraction cleaning machine for cleaning upholstery, carpet and the like, said machine comprising:

  • cleaning tool means for spraying cleaning solution on an area to be cleaned and for vacuum extracting used cleaning solution and dirt thereby cleaning said area;

    a pressurized source of cleaning solution, said source comprising;

    a tank for containing concentrated chemical cleaner;

    injector valve means adapted to be coupled to an external pressurized fresh water source for mixing concentrated cleaning chemical with water thereby outputting said cleaning solution, said injector valve means coupled to said chemical cleaner tank thereby siphoning and diluting chemical cleaner in response to fresh water flow; and

    solenoid valve means for admitting fresh water into said injector valve means;

    flow path means extending between said cleaning solution source and said cleaning tool for delivering cleaning solution to said tool;

    means for generating vacuum during operation of said machine said vacuum generating means comprising an electrically driven motor;

    vacuum tank means coupled to said vacuum generating means for temporarily storing used cleaning solution extracted be said tool;

    hose means extending between said tool and said vacuum tank for supplying vacuum to said tool;

    timer means for electrically activating said vacuum generating means and said solenoid valve means for a predetermined time; and

    means for automatically draining said vacuum tank, said draining means comprising;

    an output drain hole defined in said vacuum tank,said hole comprising a rigid periphery; and

    flapper door means flexibly suspended from said vacuum tank and adapted to sealingly contact said periphery for plugging said drain hole in response to vacuum existing inside said vacuum tank.

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