Abstract: 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.

Abstract: An improved means for locating the pilot drill of a hole saw assembly is disclosed. The assembly generally includes an arbor, which has a body and a spindle projecting from one end thereof, and a cup-shaped hole saw, with the arbor and the hole saw carrying cooperating cam and spring-loaded locking and driving means to draw one planar face of the arbor into secure flush engagement with the planar face of the base of the cup-shaped cutting member or hole saw itself. The forward face of the arbor has a recess therein, and one end of the pilot drill has a locating sleeve dimensioned so as to fit into the recess in the face of the arbor so that when the locking and driving means are utilized to draw the face of the arbor into flush contact with the face of the hole saw, the sleeve is trapped between the two faces, and the pilot drill is firmly located.