| 摘要 |
A retaining collar assembly for use with a hole saw arbor assembly. The arbor assembly includes a shaft, a hole saw attached to the shaft, a drive collar retained on the shaft for engaging the hole saw and a spring retained on the shaft. The retaining collar assembly includes a retaining collar which is retained on the shaft and abuts the spring such that the spring urges the retaining collar towards the drive collar. An axial limiting area is disposed on the shaft spaced away from the collar with a retaining collar rotating area disposed therebetween. The retaining collar rotating area allows the collar to rotate about the shaft while the axial limiting area only allows axial movement and not rotary movement. Protrusions and recesses are formed on the retaining collar and drive collar to prevent rotary movement of the retaining collar and drive collar relative to one another when the retaining collar is positioned in a retaining position. The retaining collar can be disengaged from the drive collar by rotating the retaining collar an angle so that a bore extending through the retaining collar aligns with the axial limiting area allowing simultaneous axial displacement of the retaining collar and the drive collar along the shaft. When the retaining collar is axially displaced along the shaft, the drive collar is disengagable from the hole saw. When the retaining collar is urged into engagement with the drive collar, the drive collar cannot be unintentionally disengaged from the hole saw.
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