Bypass-type motor protecting device for a vacuum cleaner
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United States of America Patent
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Jan 8, 2013
Grant Date -
Feb 10, 2011
app pub date -
Aug 10, 2009
filing date -
Aug 10, 2009
priority date (Note) -
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Abstract
A bypass-type motor protecting device includes: a casing fitted into a bypass opening in a body housing of a vacuum cleaner and having an inner abutment wall; a seat body having a bypass entry port; a valve body unit movable within the casing relative to the bypass entry port and including a valve disc to be engaged with and disengaged from the seat body, a plunger body having an externally accessible operated head and an axially extending threaded shank, and an abutment member threadedly engaged with the shank such that rotation of the operated head results in a change of an axial distance between the abutment member and the inner abutment wall; and a biasing member disposed to bias the abutment member and the inner abutment wall such that a biasing force thereof is varied in strength by the change of the axial distance.
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