| 摘要 |
<p>A hole saw and drive includes a cup-shaped saw body (52) having a closed end (47) and a plurality of cutting teeth (48). A left-hand threaded collar (63) is secured to the closed end and defines one or more drive tabs (72) extending into the saw body interior. A left-hand threaded mandrel (51) is received within the threaded collar (63) and includes a pilot drill (56) and intermediate outwardly extending flange (60). An additional set of one or more drive tabs (71) extend upwardly toward the threaded collar from the flange. The drive tabs (71, 72) cooperate to couple rotational power from the mandrel (51) to the saw body (52). The left-hand threads (53, 81) on the mandrel and collar cooperate to permit the reverse rotational operation or the mandrel (51) to expel a cutting plug from the saw body interior.</p> |
