Boringgeoff
Plastic
- Joined
- May 12, 2019
Hi all, I've got this unbranded chain drill which I hope someone can enlighten me about. The chuck looks very similar to the Russell anti friction chuck (US Pat 1,018, 008 Feb 20 1912) based purely on the shape of the jaws. The chuck is quite large, a tad under 2" in diameter and 2 1/2" long and takes up to 1/2" bits.
Two gears on the shaft can be locked together or held apart, the gear nearest the chuck has an internal thread that matches the shaft while the other gear is smooth inside and keyed to the shaft. When the two are locked together by the small gear above them the shaft cannot advance or retract. The flat washer under the knurled nut has a flat machined on one side to allow the keyed cog to be moved and held in or out of gear.
I'm sorry if I haven't explained it very well.
Cheers,
Geoff.
Two gears on the shaft can be locked together or held apart, the gear nearest the chuck has an internal thread that matches the shaft while the other gear is smooth inside and keyed to the shaft. When the two are locked together by the small gear above them the shaft cannot advance or retract. The flat washer under the knurled nut has a flat machined on one side to allow the keyed cog to be moved and held in or out of gear.
I'm sorry if I haven't explained it very well.
Cheers,
Geoff.