Whistle to signal clogged air filter

• US 4,321,070 A
• Filed: 08/22/1980
• Issued: 03/23/1982
• Est. Priority Date: 08/22/1980
• Status: Expired due to Term

• Current Assignee: Newtron Products Incorporated
• Original Assignee: BEDE Industries Incorporated
• Inventors: Bede, James D.
• Primary Examiner(s): Smith, Robert I.
• Application Number:
  US06/180,338
• Time in Patent Office: 578 Days
• Field of Search: 55/270, 55/274, 116/70
• US Class Current: 96/419
• CPC Class Codes: B01D 2273/24 Making use of acoustic waves, e.g. for measurements
• CPC Class Codes: B01D 46/0086 Filter condition indicators
• CPC Class Codes: F02M 35/09 Clogging indicators ; Diagnosis or testing of air cleaners sensors therefore F02M35/10373

Abstract

A simple two-piece reusable plastic whistle which, when installed in an air filter, emits a shrill tone to signal a predetermined clogged condition of the filter at which time the filter should be cleaned or replaced.

Claims

1. A whistle to signal a predetermined clogged condition of an air filter comprising a first part having a flange adapted to engage a minute portion of the upstream side of a filter and a cylindrical extension from said flange adapted to extend through the filter medium;

and a second part of disc-like form having snug removable interengagement with the downstream end portion of said extension and constituting a flange adapted to engage a minute portion of the downstream side of the filter and to compress the filter medium between said flanges;

said parts defining therebetween a cylindrical chamber including axially spaced apart end walls each having a central orifice therethrough operative in conjunction with said chamber to emit an audible signal upon predetermined increase in pressure drop across the filter.

2. The whistle of claim 1 wherein a tubular lip of said end portion from the end wall of said first part bounds said chamber and has such snug interengagement with a cylindrical recess in said second part of which the bottom constitutes the end wall of said second part.

3. The whistle of claim 2 wherein the end of said lip engages the bottom of said recess to determine the axial spacing of said end walls.

4. The whistle of claim 3 wherein said orifices are of diameter substantially equal to the axial spacing of said walls.

5. The whistle of claim 4 wherein said chamber is of diameter several times that of said orifices.