US 7,537,065 B2
Angle grinder
William Gallagher, Shrewsbury, Pa. (US); David W. Weiford, Parkville, Md. (US); William Goddard, Shrewsbury, Pa. (US); and Eric Hatfield, Owings Mills, Md. (US)
Assigned to Black & Decker Inc., Newark, Del. (US)
Filed on Jan. 09, 2003, as Appl. No. 10/339,634.
Claims priority of provisional application 60/347426, filed on Jan. 10, 2002.
Prior Publication US 2003/0190877 A1, Oct. 09, 2003
Int. Cl. B23B 45/02 (2006.01)
U.S. Cl. 173—170  [173/216; 173/217] 6 Claims
OG exemplary drawing
 
1. A gear case for a power tool, comprising:
a housing portion including an inner wall and an outer wall, said inner wall defining a gear well portion adapted for receiving a drive gear and a driven gear therein, said inner wall being disposed between said outer wall and said gear well portion and said inner and outer walls defining an air flow cavity therebetween;
a wheel spindle cavity disposed in said inner wall on an opposite side from said air flow cavity, said wheel spindle cavity being adapted to receive a spindle of the driven gear therein;
an air bleed hole disposed in said inner wall connected between said wheel spindle cavity and said air flow cavity, said air bleed hole being substantially conical in shape with a narrow end thereof opening into said air flow cavity and a wide end thereof opening into said wheel spindle cavity.