Top of Site > Clamps as Things > Field Guide > Jaws
Table of Contents
There are two kinds of jaws: through and stopped. A through jaw has two threaded holes through it. A stopped jaw has two smooth holes, one goes through, and the other does not
The places on a jaw are conventionally (by me) called:
For a stopped jaw, we can also define
I hang my clamps with the middle spindle going up, the end spindle going down, nose away, and then "right" falls right out. It is a convention, and an arbitrary one at that.
Shape is the most distinctive characteristic to determine maker, but size is also useful to distinguish models when the model number is worn or marred.
Is there a distinct edge between the back and the outside face, and between the outside face and the angle?
No: a Hood , or Hood and Rice.
Yes: check the chamfering, which is
Note:
some makers always (AFAIK) used flat chamfering: Bliss, Narragansett,
Hood;
some makers always (AFAIK) used beaded chamfering: Aldrich;
some makers offered beading as an extra cost option: Chapin.
Is the chamfering flat, and uniform, along five edges? Yes: either
Narragansett (when chamfer is closer to
horizontal) or Grand Rapids ( when the chamfer is closer to
vertical)
Is the chamfering flat, and tapering down the nose, along five
edges? Yes: a Bliss company
Is the chamfering rounded, along five edges? Yes:
Sandusky or Sargent
(These appear to have identical chamfering.)
Is the chamfering "stepped", along five edges? Yes:
Dodge Manufacturing
See note about Greenfield Tool Co..
Is the chamfering flat, and tapering down the back, and down the angle, along six edges? Yes: Hood
Is the chamfering half-round, along eight edges? Yes:
Sandusky
(I have one example of this, and it might be wear!
The other examples have half-rounding on 5 edges.)
Is the chamfering half-round, along ten edges? Yes: Aldrich, or Webster and Butterfield
These clamps have a graceful curving transition from outside face to adjacent faces. Also, the chamfer starts narrow at the back, widens, is uniform along the outside, then narrows along the angle. Lastly, their top and bottom sides are not parallel.
These, including ONeil, have exactly the same chamfering.
The several known specimens by Buttrick all vary among themselves.
I have only one specimen of Stanley; John Adams is helping in the research on this maker.
I have only a few specimens of Sargent; I hate to generalize.
The illustration in the catalog of 1872 shows a flat chamfer, rather Bliss-like, but the details are obscure. I hope someone has a specimen I could examine.
See the Model pages for dimensions of jaws.
The Rhode Island companies have flat chamfers, while the eastern Massachusetts companies have more complex chamfers.
There is no Connecticut type.
last revised and validated
Copyright © 1996- Wooden Clamp Journal