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Vacuum cleaner

  • US 5,638,573 A
  • Filed: 05/30/1995
  • Issued: 06/17/1997
  • Est. Priority Date: 05/12/1994
  • Status: Expired due to Term
First Claim
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1. A vacuum cleaner comprising:

  • a body having a front end from which said body is pulled along a surface on which it rests, a rear end opposite said front end, a center of gravity between said front end and said rear end, an underside adjacent said surface, a longitudinal axis running from said front end to said rear end, a steering axis adjacent said front end and substantially perpendicular to said longitudinal axis and said surface, and a main wheel axis substantially perpendicular to said longitudinal axis, substantially parallel to said surface, and adjacent said center of gravity;

    at least two wheels mounted on said underside of said body for rotation about said main wheel axis; and

    a caster mounted on said underside of said body, adjacent said front end, for rotation about said steering axis, said caster having a caster wheel axis perpendicular to said steering axis and having a caster wheel mounted for rotation about said caster wheel axis;

    at least one additional caster mounted on said underside of said body adjacent said rear end;

    whereby;

    when said vacuum cleaner is pulled parallel to said surface in a direction oblique to said longitudinal axis, said body pivots about a pivot axis substantially parallel to said steering axis and passing through said wheel axis.

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  • 6 Assignments
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