Electric drill with modified bit gripping assembly
View Patent ↗An electric drill ( 10 ) has a drive assembly ( 31, 70 ), and a pivot head ( 32 ) having first and second bit gripping assemblies ( 14, 22 ) disposed at 90 degrees to each other. The electric drill ( 10 ) also includes means for adjusting the position of the bit gripping assemblies ( 14, 22 ) relative to the drive assembly ( 31, 70 ) by pivoting the head ( 32 ) through 90 degrees, whereby a selected one of the bit gripping assemblies is operatively engaged to the drive assembly. The position adjusting means may include a movable locking sleeve ( 36 ) which, in a first position, allows the drive assembly to operatively engage the selected bit gripping assembly and, in a second position, allows the drive assembly to disengage the selected bit gripping assembly.
1. An electric drill comprising a drive assembly, a head having first and second bit gripping assemblies disposed at 90 degrees to each other, and means for adjusting the position of the bit gripping assemblies relative to the drive assembly by pivoting the head through 90 degrees, whereby a selected one of the bit gripping assemblies is operatively engaged to the drive assembly, wherein the position adjusting means includes a movable locking sleeve which, in a first position, allows the drive assembly to operatively engage the selected bit gripping assembly and, in a second position, allows the drive assembly to disengage the selected bit gripping assembly, and wherein the locking sleeve is movable by sliding reciprocatingly over a locking sleeve guide secured to a rear body of the drill.
2. The electric drill of claim 1 wherein the position adjusting means includes a harness which is secured to the locking sleeve, and a lever which is pivotally connected to the body and engaged to the harness such that pulling of the lever causes the harness to slide the locking sleeve rearwardly towards the body, thereby causing the drive assembly to disengage the selected bit gripping assembly.
3. The electric drill of claim 2 wherein the lever is adapted to be pulled by a finger of the user's hand gripping a handle.
4. The electric drill of claim 3 wherein the drive assembly includes a slideable drive shaft which is adapted to slide rearwardly in concert with the locking sleeve.
5. The electric drill of claim 4 wherein the position adjustment means includes a coil spring which, after release of the lever by the finger, causes the drive assembly to engage the selected bit gripping assembly.
6. The electric drill of claim 5 wherein the head is pivotally connected to the locking sleeve guide, and a pair of opposed pivoting assemblies for the head are received through respective guide tracks formed in the locking sleeve.
7. The electric drill of claim 1 wherein the first bit gripping assembly is a chuck for a drill bit, and the second bit gripping assembly is a bit holder for a screw bit.
8. The electric drill of claim 1 further including a battery power supply whereby the drill is portable.