| 摘要 |
A hand-held grinder, e.g. an eccentric or an oscillating grinder, comprises a grinding platen (20, fig. 1) for receiving a grinding disc (40, figs. 1 and 10). The platen (20, fig. 1) has slot-shaped axial through-holes 28 for dust extraction passing right through it, the through-holes being at least twice as long as they are wide The through-holes 28 extend radially outwards from the centre of the platen (20, fig. 1) and lie perpendicularly to the platen's sole (25, fig 1). The longitudinal sides of each of the through-holes 28 may be surrounded by ribs (38 and 39, figs. 4-6). Through-holes 28 may be crossed by arcuate grooves 29 formed in the platen's sole (25, fig. 1), the grooves 29 being curved to form a spiral with the concave side of each lying in the direction of rotation of the platen (20, fig. 1). The grooves 29 each end at a blind hole 27 for dust extraction. |
