B - Operations – Transporting – 23 – B
Patent
B - Operations, Transporting
23
B
B23B 31/103 (2006.01) B23Q 3/12 (2006.01) B25B 15/00 (2006.01) B25B 23/00 (2006.01)
Patent
CA 2497716
A bit locking mechanism for a screwdriver having a shaft with a bit chuck formed in one end of the shaft. A slot in the shaft intersects a rearward portion of the chuck. A lever is pivotally mounted in the slot, and extends parallel to the shaft. A tab on the lever's forward end has a rearward face substantially perpendicular to the lever's longitudinal axis. A spring normally biases the tab into the chuck. The locking mechanism is used with a bit having a rearward collar with a length substantially equal to the difference between (i) the distance from the lever's pivot point to the tab's rearward face, and (ii) the distance from the lever's pivot point to the chuck's rearward end. The collar's forward face is substantially perpendicular to the bit's longitudinal axis. As the bit is inserted into the chuck, the bit's rearward end slides under the lever, overcoming the spring's bias and pivoting the lever into a bit insert/release position. When the collar's forward face moves rearwardly of the tab's rearward face, the spring pivots the lever into a closed position in which the tab protrudes into the rearward end of the chuck, with the tab's rearward face latched against the bit's forward face, preventing unintended withdrawal of the bit from the chuck.
Fruhm Hermann
Oyen Wiggs Green & Mutala Llp
LandOfFree
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