US PATENT SUBCLASS 15 / 362
.~.~ With nozzle carriage or mount having work-surface penetration control, e.g., differential area supporting wheels

Current as of: June, 1999
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15 /   HD   BRUSHING, SCRUBBING, AND GENERAL CLEANING

3  DF  MACHINES {11}
300.1  DF  .~ With air blast or suction {26}
362.~.~ With nozzle carriage or mount having work-surface penetration control, e.g., differential area supporting wheels

DEFINITION

Classification: 15/362

(under subclass 300) Cleaning apparatus having a nozzle supported on, and nonadjustable or fixed with respect to, a work-contacting carriage or mount, the work-contacting portion of the mount being constructed and arranged to compensate for or prevent penetration into carpet pile or other yielding surfaces to thereby maintain the nozzle at optimum or substantially uniform spacing from the top of the pile.