The pad is
lignum vitae.
|
Ratchet apart -
ready to rivet.
|
|
The hammer in
the background is a 4 ounce ball peen.
|
Rotating the
knob raises one or the other pawl. The pin is the old rivet.
|
It doesn't
matter which way the konb is rotated.
|
|
|
|
|
B&D-76
Price: SOLD
The
chuck follows USA Patent No. 234,517 granted November 18, 1880 and
contains both original jaws and their retainer clips. The ratchet
mechanism
is according to US Patent No. 113,6807, granted April 11, 1871. Quimby
Backus was the inventor of the chuck, but J.T. Lynam was the only known
manufacturer of braces with this ratchet mechanism.
The
ratchet springs also function as the ratchet pawls, and someone
overloaded the brace, buckling both ratchets, so the integral springs
no longer functioned. I replaced and riveted the ends of a piece of
drill rod (used to be called "cast steel") in order to secure the pawls
after straightening them over a piece of hard wood by striking them
gently with a heavy (three pounds) hammer. It took about 10,000 taps
with a four ounce ball peen hammer to upset the ends of the drill rod.
Then I trimmed the sharp edges of the rivet heads with a
bit-brace-sharpening file (safe edges).
The
brace [now] functions excellently, albeit quite noisily.
|
