Apparatus for collecting filtered airborne

Claim 2

Collecting apparatus for airborne solid particles comprising: a. an air duct of substantially rectangular configuration; b. means to support a substantially rectangular section of filter media in a substantially semi-cylindrical configuration crosswise of said duct; c. differential pressure means to move air to the inside surface of the media for deposit of solid particles thereon; d. a nozzle mounted for reciprocating movement about an axis concentric with the axis of the semi-cylindrical configuration and having a suction orifice extending parallel with said axis, said nozzle orifice being radially disposed at a distance from said axis not greater than the radius of the media configuration; e. means for applying suction to the nozzle to remove solid particles from said media; and f. means for reciprocally moving said nozzle about said axis over substantially the entire arcuate length of said filter media.

Claim 3

The invention according to claim 1 and further including means for automatically terminating the operation of said reciprocal moving means when the nozzle is in a mid-position of its reciprocal movement.

Claim 4

The invention according to claim 1 wherein said filter media is flexible and said means to support the media comprises a semi-cylindrical, relatively rigid sheet of perforate material disposed concentric with axis, and at a radius slightly greater than the nozzle orifice radius to flex the media away from the support means under nozzle suction.

Claim 5

The invention according to claim 3 wherein the media comprises a sheet of open cell polyurethane.

Claim 6

The invention according to claim 3 wherein said perforate material comprises expanded metal.

Claim 7

The invention according to claim 3 wherein the axis about which said nozzle moves is horizontal, and the ends of the perforate media support means are substantially tangential to the upper and lower walls of the duct.

Claim 8

The invention according to claim 6 wherein the reciprocal movement of the nozzle terminates slightly beyond the lower end of the support means.

Claim 9

The invention according to claim 6 wherein the nozzle is provided with a counter balance.

Claim 10

The invention according to claim 6 wherein the nozzle is connected to suction means by a flexible conduit capable of permitting the nozzle to oscillate through its full range.

Claim 11

The invention according to claim 6 wherein the perforate media support means is provided with a marginal channel to receive the marginal edge of a rectangular section of media disposed on the support means.

Claim 12

The invention according to claim 10 wherein said channel is provided with substantially continuous gripping means for the perimetral edge of said section of media.

Claim 13

The invention according to claim 11 wherein the channel has disposed therein an ''''F'''' section resilient extrusion having a rib and tongue for gripping the media side and end edges.

Claim 14

The invention according to claim 12 wherein resilient locking clips are disposed in the channel bearing against the extrusion rib to clamp media between the rib and tongue.

Claim 15

Collecting apparatus for airborne solid particles comprising: a. an air duct of substantially rectangular configuration; b. a frame comprising spaced parallel supports connected by spaced, substantially parallel arcuate members, a rectangular section of filter media affixed to the supports to provide a substantially semi-cylindrical surface; c. means to move air to the inside surface of the media; d. a nozzle having an elongate suction orifice extending parallel with said parallel supports and mounted to oscillate on an axis concentric with the axis of the arcuate members, said nozzle orifice being radially disposed at a distance from the axis not greater than the radius of the curved surface of said arcuate members; e. means for applying suction to the nozzle to remove solid particles from said media by suction; and f. means for oscillating said nozzle about said axis over substantially the entire arcuate length of said filter media between said supports.

Claim 16

Collecting apparatus for airborne solid particles comprising: a. an air duct of substantially rectangular configuration; b. a frame comprising spaced parallel supports connected by spaced, substantially parallel arcuate members, a rectangular section of filter media affixed to the supports to provide a substantially semi-cylindrical surface; c. means to move air to the inside surface of the media; d. a nozzle having an elongate suction orifice extending parallel with said parallel supports and mounted to oscillate on an axis concentric with the axis of the arcuate members, said nozzle orifice being radially disposed at a distance from the axis not greater than the radius of the curved surface of said arcuate members; e. means for applying suction to the nozzle to remove solid particles from said media by suction; and f. means for oscillating said nozzle about said axis over substantially the entire arcuate length of said filter media between said supports.

Claim 17

The invention according to claim 14 wherein the oscillating means includes means for automatically terminating the operation of the oscillating means when the nozzle is in a mid-position of its oscillatory movement.

Claim 18

The invention according to claim 14 wherein said media is flexible, a cylindrical, relatively rigid support of perforate sheet material is disposed over the downstream side of the media concentric with the nozzle axis, and at a radius slightly greater than the nozzle orifice radius to flex the media away from the support, in response to suction at the nozzle.