Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
A device for spray-coating a workpiece with powder particles, comprising: a generally prismatic booth with a substantially fully open front side, a substantially fully open rear side, a pair of sidewalls, a roof and a bottom bounding a spray chamber; a powder-collecting unit having a housing detachably secured to said booth at said rear side thereof, said housing being substantially fully open toward said spray chamber and forming a recovery compartment below the level of said bottom including a strainer overlying a fluidized bed; a set of tubular filter elements with air-permeable peripheral surfaces disposed in said housing above said recovery compartment opposite said rear side for intercepting powder particles passing generally horizontally through said spray chamber; suction means communicating with the interior of said filter elements for drawing air from said spray chamber through said peripheral surfaces, thereby setting up a generally horizontal air flow traversing said spray chamber from said front side to said rear side; and conduit means extending from said recovery compartment to an electrostatic spray gun trainable through said front side upon a workpiece in said spray chamber for enabling said workpiece to be coated with particles from said powder-collecting unit.
Claim 2
Independent Claim
196 words
A device for spray-coating a workpiece with powder particles, comprising: a generally prismatic booth with a substantially fully open front side, a substantially fully open rear side, a pair of sidewalls, a roof and a bottom bounding a spray chamber; a powder-collecting unit having a housing detachably secured to said booth at said rear side thereof, said housing being substantially fully open toward said spray chamber and forming a recovery compartment below the level of said bottom including a strainer overlying a fluidized bed; a set of tubular filter elements with air-permeable peripheral surfaces disposed in said housing above said recovery compartment opposite said rear side for intercepting powder particles passing generally horizontally through said spray chamber; suction means communicating with the interior of said filter elements for drawing air from said spray chamber through said peripheral surfaces, thereby setting up a generally horizontal air flow traversing said spray chamber from said front side to said rear side; and conduit means extending from said recovery compartment to an electrostatic spray gun trainable through said front side upon a workpiece in said spray chamber for enabling said workpiece to be coated with particles from said powder-collecting unit.
Claim 3
Dependent Claim
79 words
A device as defined in claim 1 wherein said suction means comprises a clean-gas unit including an enclosure subdivided into a low-pressure compartment and a high-pressure compartment, blower means in said enclosure having an intake end communicating with said low-pressure compartment and a discharge end communicating with said high-pressure compartment, and an exit filter in an outlet of said high-pressure compartment downstream of said blower means, said low-pressure compartment being in communication with the interior of said filter elements.
Claim 4
Dependent Claim
46 words
A device as defined in claim 2 wherein said clean-gas unit includes a source of pressurized air and timer-operated control means for intermittently directing a blast of said pressurized air into different groups of said filter elements to dislodge particles adhering to the peripheral surfaces thereof.
Claim 5
Dependent Claim
22 words
A device as defined in claim 2 or 3 wherein said clean-gas unit overlies said powder-collecting unit and part of said booth.
Claim 6
Dependent Claim
23 words
A device as defined in claim 1, 2 or 3 wherein said filter elements have cores of star-shaped cross-section enveloped by paper sleeves.
Claim 7
Dependent Claim
36 words
A device as defined in claim 1, 2 or 3 wherein said filter elements are vertically suspended in said housing and extend from the level of said roof to a level near that of said bottom.
Claim 8
Dependent Claim
25 words
A device as defined in claim 6 wherein said filter elements are arrayed in two relatively staggered rows parallel to said front and rear sides.
Claim 9
Dependent Claim
19 words
A device as defined in claim 1, 2 or 3 wherein said bottom slopes down toward said rear side.
Claim 10
Dependent Claim
49 words
A device as defined in claim 8, further comprising an apertured screen extending from said roof across the major part of said open rear side and terminating slightly above said bottom, thereby leaving a gap for a free slide of powder particles along said bottom into said recovery compartment.