Vacuum appliance filter condition indicator
First Claim
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1. A filter condition indicator for a vacuum appliance having a filter, the filter condition indicator comprising:
- a housing;
a diaphragm dividing the housing into first and second chambers, the first chamber receiving a pressure indication from inside the filter, the second chamber receiving a pressure indication from outside the filter; and
an indicator device activated by movement of the diaphragm in response to a pressure differential between the first and second chambers;
a rack and display pinion arrangement that moves in response to movement of the diaphragm; and
a spring that biases the indicator device so as to maintain the position of the indicator device when the appliance is off.
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Abstract
A filter condition indicator for a vacuum appliance having a filter includes a housing with a diaphragm dividing the housing into first and second chambers. One chamber receives a pressure indication from inside the filter, and the other chamber receives a pressure indication from outside the filter. An indicator device is activated by movement of the diaphragm in response to a pressure differential between the first and second chambers.
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Citations
8 Claims
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1. A filter condition indicator for a vacuum appliance having a filter, the filter condition indicator comprising:
- a housing;
a diaphragm dividing the housing into first and second chambers, the first chamber receiving a pressure indication from inside the filter, the second chamber receiving a pressure indication from outside the filter; and
an indicator device activated by movement of the diaphragm in response to a pressure differential between the first and second chambers;
a rack and display pinion arrangement that moves in response to movement of the diaphragm; and
a spring that biases the indicator device so as to maintain the position of the indicator device when the appliance is off. - View Dependent Claims (2, 3, 4)
- a housing;
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5. A wet-dry vacuum appliance comprising:
- a collection drum;
a powerhead operably connected to the drum to selectively create a suction within the drum;
a filter connected to the powerhead and situated in the drum, the filter comprising;
a housing;
a diaphragm dividing the housing into first and second chambers, the first chamber receiving a pressure indication from inside the filter, the second chamber receiving a pressure indication form outside the filter; and
an indicator device activated by movement of the diaphragm in response to a pressure differential between the first and second chambers;
a rack and display pinion arrangement that moves in response to movement of the diaphragm; and
a spring that biases the indicator device so as to maintain the position of the indicator device when the appliance is off. - View Dependent Claims (6, 7, 8)
- a collection drum;
Specification