Patent ID: 8303380

Claim:
A head for an orbital abrading machine comprising: a housing; a shroud including inner and outer portions, defining a chamber between said inner and outer portions; a drive means for driving an abrading pad, said drive means at least partially enclosed by said housing and said shroud, wherein said drive means produces an exhaust which is directly vented into said chamber without leaving said head; and an exhaust cavity for receiving said exhaust from said drive means, said exhaust cavity in pneumatic communication with said chamber for enabling said exhaust to flow from said exhaust cavity and into said chamber, wherein: said chamber includes at least one opening for directing said exhaust toward said abrading pad for cooling said pad with said exhaust; said drive means comprises a pneumatically-powered rotor; said inner and outer shroud portions are engaged against said housing about an orifice with a first seal and a second seal, respectively; and, said orifice provides said pneumatic communication between said exhaust cavity and said chamber, said first and second seals for preventing leakage of said exhaust as said exhaust flows from said exhaust cavity through said orifice into said chamber.