| 摘要 |
Quick-release arbor for hole saws has a generally cylindrical shaft with a threaded end portion for a screw-fitted connection to the threaded bore of a hole saw. A collar is disposed about the shaft, includes a shank, at one end, adapted for connection to a power driven chuck and, at its other end, a pair of diametrically spaced-apart drive-pins. The collar and shaft are characterized, respectively, by inner and outer diameters which provide a clearance therebetween so that the collar and the shaft are both axially movable and rotatable relative to each other. A retainer carried by the collar and another retainer carried by the shaft for interengagement with the one retainer. The retainers are disposed for releasably retaining the collar in a retracted position and configured to enable clockwise rotation of the shaft for threading the same to a snug fit within the central bore of the hole saw and, without backing off the snug fit, to enable further rotation of the collar to align the drive pins with the drive holes. Interengagement of the retainers being such that the collar is movable axially relative to the shaft from its retracted to its extended position for manually fitting the pins into the drive holes.
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