| 摘要 |
A quick-locking arbor, pilot drill, and hole saw assembly having particular utility with relatively small diameter hole saws in which one end of the pilot drill is received within a bore in the arbor, with a spring or other tension means surrounding the shank of the drill. The inserted end of the drill carries a washer and drill drive or sleeve, and the spring is trapped between the washer and a bushing which is held in the arbor body. A collar is carried on the pilot drill intermediate its ends and has camming surfaces integral therewith. The hole saw, being an elongate, hollow, cylindrical cutting member, has internal cam means which cooperate with the cam surfaces of the collar on the pilot drill so that upon relative rotation therebetween, the pilot drill is urged away from the arbor against the face of the spring or tension means, which is compressed between the washer and the end of the bushing, whereby the saw is locked between the end of the arbor and the collar. Stop means are provided on the forward end of the arbor and the rearward end of the hole saw collar to limit the degree of rotational movement between the saw and the arbor and thereby limit the axial movement of the drill upon engagement of the same. These stop means also serve as driving means for the saw. |
