Air filter condition indicator
OwnerHarry F. Slaterinventor
Life of this patent
Estimating the term…
Abstract
An air filter condition indicator which provides an indication of the degree of clogging of the air filter. The indicator has a housing which supports a cylinder. A balance assembly has a hub member supported by the housing, and a balance lever having a piston rod and piston at one end and a counter weight at the other end. An actuation weight arm extends downwardly from the balance lever and has a movable weight which adjusts the sensitivity of the device. An indicator member held by the hub member on the balance assembly as a fan pulls air through the air filter, one side of the piston is connected to the fan side of the air filter and the other side of the piston is open to ambient air. The amount of movement of the piston is shown by the indicator member.
Claims10
An air filter condition indicator which provides an indication of the degree of clogging of the air filter being checked, said air filter being mounted in an air treating apparatus of the type having an air fan with an air intake, an air volume between said air filter and said air intake of said air fan, said air filter condition indicator comprising:
- a housing having a base plate having a front surface and a back surface;
- a cylinder member held by said base plate, said cylinder having a first end and a second end;
- a balance assembly support pin held by said base plate of said housing;
- a balance assembly rotatingly held by said support pin and said balance assembly comprising:
- a hub member rotatingly supported on said balance assembly support pin;
- a generally horizontal balance lever held by said hub member, said balance lever extending away from said hub, said balance lever having a first end which supports a counterweight and a second end which supports a piston rod;
- a piston rod having a piston end and a balance lever end rotatingly supported on the second end of the generally horizontal balance lever, a piston held by the piston end of the piston rod, said piston being positioned in said cylinder member between the first end and the second end thereof;
- a counterweight mounted on the first end of the generally horizontal balance lever;
- an actuation weight held by said actuation weight arm;
- an indicator member moveable in response to rotational movement of said balance assembly;
- and
- a first air passageway to one of the first and second ends of the air cylinder, said first air passageway being connected to ambient air and a second air passageway to the other of the first and second ends of the air cylinder, said second air passageway being connected to said air volume between said air filter and said fan, whereby said piston and said balance assembly moves in response to a pressure differential across said air filter when said fan is operating.
Dependencies are inferred from the claim text.