Air filter capable of visual indication of a clogged condition thereof
First Claim
1. An air filter capable of visual indication of a clogged condition thereof, comprising:
- a housing formed with an air inlet, an air outlet, and an air passage extending from said air inlet to said air outlet;
a filter unit mounted on said housing for filtering air flowing through said air passage;
a fan unit mounted in said housing for drawing air into said air passage via said air inlet and for blowing air out of said air passage via said air outlet; and
a signaling device including a flap disposed to span said air passage, a horizontal pivot pin connected securely to said flap and pivotable relative to said housing, and a pointer connected to one end of said pivot pin and rotatable with said pivot pin relative to said housing, wherein air flow through said air passage in an unclogged condition of said air filter blowing said flap to pivot and cause said pivot pin to rotate and move said pointer to a first position relative to said housing, and wherein a reduction in the air flow through said air passage attributed to a clogged condition of said air filter causing said flap to pivot and move said pointer to a second position relative to said housing so as to indicate the clogged condition of said air filter.
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Accused Products
Abstract
An air filter capable of visual indication of a clogged condition thereof includes a housing, a filter unit, a fan unit and a signaling device. The housing has an air inlet, an air outlet, and an air passage extending from the air inlet to the air outlet. The signaling device includes a flap disposed to span the air passage, a horizontal pivot pin connected securely to the flap and pivotable relative to the housing, and a pointer connected to one end of the pivot pin and rotatable with the pivot pin relative to the housing. A reduction in air flow through the air passage attributed to a clogged condition of the air filter causes the flap to pivot and move the pointer relative to the housing so as to indicate the clogged condition of the air filter.
55 Citations
8 Claims
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1. An air filter capable of visual indication of a clogged condition thereof, comprising:
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a housing formed with an air inlet, an air outlet, and an air passage extending from said air inlet to said air outlet;
a filter unit mounted on said housing for filtering air flowing through said air passage;
a fan unit mounted in said housing for drawing air into said air passage via said air inlet and for blowing air out of said air passage via said air outlet; and
a signaling device including a flap disposed to span said air passage, a horizontal pivot pin connected securely to said flap and pivotable relative to said housing, and a pointer connected to one end of said pivot pin and rotatable with said pivot pin relative to said housing, wherein air flow through said air passage in an unclogged condition of said air filter blowing said flap to pivot and cause said pivot pin to rotate and move said pointer to a first position relative to said housing, and wherein a reduction in the air flow through said air passage attributed to a clogged condition of said air filter causing said flap to pivot and move said pointer to a second position relative to said housing so as to indicate the clogged condition of said air filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification