Patent ID: 6878049
Filing Date: 2005-04-12
Classification: B24B

Abstract:
1. A random orbital sander comprising: a manually manipulated housing having a downward opening chamber and pressurized fluid inlet and fluid outlets communicating with said chamber; a pressurized fluid operated motor including a motor casing arranged within said chamber and a counter balanced motor shaft depending from said casing and supported for driven rotation about a first axis by upper and lower casing mounted bearings incident to the introduction of pressurized fluid into said casing from said chamber; a first sealing means bridging between said motor shaft and said casing for providing a dust seal for said lower bearing; coupling means for drivingly connecting a sanding pad to said motor shaft for rotation about a second axis disposed parallel to said first axis, said coupling means including a further bearing and a balancer bearing shaft supported by said further bearing for rotation about said second axis; and a second sealing means bridging between said balancer bearing shaft and said motor shaft for providing a dust seal for said further bearing.