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Anderson Expansive Bit

B

Boringgeoff

Seedling
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On March 20th 1889 Robert J. Anderson of Liverpool was granted the patent for this Expansive bit. In simple terms, he attached a swinging cutter to a pre-existing centre bit to allow it to cut varying diameter holes in wood. Thanks to researcher and Auger bit enthusiast, Eric Brown, for sending me a copy of the patent which I'm passing on with his permission.
Cheers,
Geoff.
 

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I think we've discussed this one before, Geoff. On the evidence of this specimen, I'd say it was a bit too flimsy if actually used for boring holes!
IMG_20241212_082440855.jpgIMG_20241212_082528977.jpg
 
Yes, we have discussed this previously Andy, I'd be pretty careful about giving it a go, my three specimens are all missing their spur. Either broken or sharpened off.
 
That does look a bit more robust;)

I wonder if the spur started out that tiny?
 
Thank you Geoff, yes, very close with the tiny spur and the fact the adjustment slot is open ended.
I'd wonder if the Boker was another add on to a standard centre bit whereas the Ibbotson is specifcally forged with a recess for the pivoting wing.
I had a go at making the adjustment earlier but realised after giving the screw as much torsion as I dare that the exposed end of the thread looks like it has been hammered. Perhaps the locking into position was fraught with failure.
Check out those lovely cone shaped screw heads.
By the way please do mention to Eric that he may use my pictures for making an entry to his list if he wishes.
If they need to be better I'll sort it.
Cheers, Andy
 
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