| 摘要 |
A plug ejecting hole saw includes a cylindrical saw cup provided with front cutting teeth, and an end wall having therethrough a non-circular concentric aperture; and an arbor holder removably attachable to a saw cup that includes a collar slidably holding a body including a nose piece, that has a cross-section which fits congruently within the aperture, and a pair of longitudinal grooves, which slidably hold locking tabs biased forward by springs to abut transverse ribs in the nose piece. The longitudinal grooves intersect a pair of transverse grooves blocked by the tabs. Inserting the nose piece into a cup aperture and pushing it forward causes each tab to be pushed rearward in a longitudinal groove, unblocking the transverse grooves and allowing the nose piece to be rotated relative to the saw cup, each tab springing forward to block a transverse groove and thereby lock the arbor holder to the sawcup.
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