Spray booth and system

Claim 2

A spray booth, comprising in combination, a body portion having walls, vertical panels on said walls being removable to thereby expose the interior at an opening for the insertion of a spray gun and product targets to be sprayed, an inverted double bottomed pyramidal hopper joining at its upper edges to the side walls of the aforesaid body, the inner bottom terminating at its upper portion in spaced relationship to the outer bottom of said doubled walled inverted pyramidal hopper thereby defining between said bottoms a chamber through which air can pass, an open vertex at the bottom portion of said inverted pyramidal double bottomed hopper, equilateral openings in the upper portion of said double bottomed hopper to thereby provide for the passage of air in a uniform curtain wall to deliver the same as well as accumulated dust to the bottom of said inverted pyramidal double bottomed hopper, a conduit positioned in pneumatically communicating cooperation with the lower portion of said inverted double bottomed pyramidal hopper to thereby, under reduced pressure, cause air to come in through the opening in the center of said inverted double bottomed pyramidal hopper as well as around the equilateral edges where the upper portion of said hopper joins the side walls, and means for securing a target for the electrostatic deposition of powder within said spray booth, whereby when the target is positioned within the spray booth a curtain wall of air is provided to flow down into the chamber defined between the double bottom of said inverted pyramidal hopper.

Claim 3

In the spray booth of claim 1 above, a T-shaped connector at the lower portion of said inverted pyramidal hopper providing a reclosable opening through which air can be blown to thereby accelerate the cleaning of spray particles therefrom when the operation of the booth is shifted from one color to another or otherwise requires intermittent cleaning.

Claim 4

In the spray booth of claim 1 above, a flow control canopy provided immediately above and in overlying relationship to the open vertex at the bottom of said inverted pyramidal double walled hopper.

Claim 5

In the spray booth of claim 3 above, said flow control canopy being pyramidal in shape, and supported above the opening at the bottom of said double walled inverted pyramidal hopper, said canopy being proportioned to define an adjustable opening between its edges and the base of the inverted pyramidal double walled hopper of approximately the thickness of the opening provided about the upper edge of the inverted pyramidal hopper.

Claim 6

In the spray booth of claim 4 above, said canopy being supported by a pair of spiders, one at the bottom and one at the top, whereby the same is held in place by gravity and easily removable.

Claim 7

A spray booth and system for use in electrostatic dry spraying comprising, in combination, a booth having a plurality of side walls, an inverted double bottomed pyramidal hopper at the lower portion of said booth having an opening at its lower portion, means communicating pneumatically with the lower portion opening of said inverted double bottomed inverted pyramidal hopper to thereby provide a curtain wall around the periphery of said inverted hopper at its upper portion, a bag extractor having a lower recovery hopper said pneumatic communicating means which communicates with the bottom of said inVerted hopper communicating directly into said recovery hopper, a plurality of porous bags removably secured to a baffle plate positioned above said recovery hopper, a plenum chamber in which said bags are located under negative pressure, a blower having an inlet and exhaust, the said inlet being at reduced pressure to thereby provide a partial vacuum, connector means in pneumatic communication with said blower inlet and the bag chamber defined above, an exhaust from said blower directed in controlled relationship to the spray booth, whereby a curtain wall of air is provided at the base of said booth in combination with the opening at the bottom portion of said inverted double bottomed pyramidal hopper to collect and deliver the unused particles of coating into the recovery hopper and on the interior surface of the bags and whereby upon shaking of said bags at a time when the booth is shut down or color is changed, the unused particles are available for collection and recycling in the electrostatic spray operation.

Claim 8

A spray booth and system for use in electrostatic dry spraying comprising, in combination, a booth having a plurality of side walls, an inverted double bottomed pyramidal hopper at the lower portion of said booth having an opening at its lower portion, means communicating pneumatically with the lower portion opening of said inverted double bottomed inverted pyramidal hopper to thereby provide a curtain wall around the periphery of said inverted hopper at its upper portion, a bag extractor having a lower recovery hopper said pneumatic communicating means which communicates with the bottom of said inVerted hopper communicating directly into said recovery hopper, a plurality of porous bags removably secured to a baffle plate positioned above said recovery hopper, a plenum chamber in which said bags are located under negative pressure, a blower having an inlet and exhaust, the said inlet being at reduced pressure to thereby provide a partial vacuum, connector means in pneumatic communication with said blower inlet and the bag chamber defined above, an exhaust from said blower directed in controlled relationship to the spray booth, whereby a curtain wall of air is provided at the base of said booth in combination with the opening at the bottom portion of said inverted double bottomed pyramidal hopper to collect and deliver the unused particles of coating into the recovery hopper and on the interior surface of the bags and whereby upon shaking of said bags at a time when the booth is shut down or color is changed, the unused particles are available for collection and recycling in the electrostatic spray operation.

Claim 9

In the spray booth system of claim 6, said plenum chamber being defined by a cell plate at the bottom, said cell plate having longitudinal bag inlets, a bag closed at the upper end by a tubular seam with the open end conforming to the longitudinal inlets in the cell plate, and a hanger at the top of the plenum chamber having a removable bar for passing through the bag seam for supporting the bag removably in the plenum chamber.

Claim 10

In the spray booth system of claim 6, a double walled hood above the double bottomed hopper, and pneumatic conduit means connecting said blower exhaust to said hood thereby creating a positive curtain wall of air.