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Antique Machine Tools (Pre 1930)

Oddball Jacobs chuck key


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  #1  
Old 07-31-2019, 11:29:46 PM
Rob Charles Rob Charles is offline
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Default Oddball Jacobs chuck key

Okay here's an off the wall ? I have 2 of these chuck keys which are for very early Jacobs drill chucks. I googled the chuck no. s and came up blank. One key is for a 12&14 and the other is for a #9&11s The chucks would have a spiral gear on the sleeve instead of the usual straight gear. Anyone seen the chucks? Thanks Rob
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Old 08-01-2019, 12:22:50 AM
LCJudge LCJudge is offline
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Default Re: Oddball Jacobs chuck key

Rob,
The first, very first that is, Jacobs ball bearing chucks had the spiral cut. The angle helped keep the key engaged in the chuck rather than slipping out and leading to premature damage to the teeth on the chuck (that is for tightening the chuck.....if you overtightened it, it would slip even worse trying to loosen it). Soon thereafter better techniques were devised to harden the teeth and the spiral cut went away. Here's an early chuck that would have used your key. You see very few of these chucks. I've maybe seen 3 in all the years I've looked at this junk. Not sure I've ever seen a loose chuck key. I'd say the key would be harder to find than the chuck.
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Old 08-01-2019, 12:40:58 AM
Rob Charles Rob Charles is offline
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Default Re: Oddball Jacobs chuck key

Well I have 2 keys so I should be looking for the chucks now. I have a set of the 1902 patent plain bearing chucks. They have straight cut teeth. I have some of the keys for them. They take the same size keys as their modern cousins but are tall like the spiral teeth key I posted. Maybe I should start the "early American drill chuck collectors club" Rob
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Old 08-01-2019, 01:04:49 AM
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Photo Re: Oddball Jacobs chuck key

I dug Mine out the last time they were mentioned a few months ago and then lost track of the other thread so may as well post it here.

Don't remember if I have a chuck it fits or not.

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Old 11-04-2019, 03:31:51 PM
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Default Re: Oddball Jacobs chuck key

I have one of those spiral toothed Jacobs chucks, have never seen a key to fit it..Victor
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Old 11-04-2019, 03:48:26 PM
Rob Charles Rob Charles is offline
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Default Re: Oddball Jacobs chuck key

What no. Chuck?
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