I don't think that the 'Type 3' in the government spec is referencing a patent or version/iteration of the device. I'm sure I'll ****** up the explanation. Hoping that Lugz will jump in and help me out on this one...
Type refers literally to type, or kind. For example, in GGG-S-121a, Screwdrivers, Type 1 = Cabinet (electricians), Type II = Close-quarter, etc. There are no stud removers in the 1939 Fed Specs I have, but I would imagine for stud removers it would be something like Type 1 = Eccentric wheel grip, Type 2 = Concentric wheel grip, Type 3 = Slide grip, Type 4 = Tubular grip, etc.
All,
I really need to clean up a mess of hastiness on my part from yesterday, for which I apologize.
Snap-on first introduced the eccentric wheel grip type stud remover in 1933. It was Snap-on part number A-36. Generally speaking, that is the "type" of stud remover that Mike and I both have with a Bonney brand, a Bonney part number (2591A), and Snap-on date codes, made in the late 70's. That is also the type that Don has branded Hastings with a Snap-on date code of 1983.
With one significant caveat. A-36 is shown and described as having an enclosed housing (where the stud goes through the top of the housing, and also through the bottom of the housing, with the eccentric gripping cam wheel swiveling in a slot in the housing), just like the figure of Bonney stud remover 2591 shown in all Bonney catalogs, and just like the CV-era example that LS has.
In Mike's, mine, and Don's, the housing is open. The stud only extends through a single bore in the housing. And the eccentric cam wheel swivels and grips it in the open, at the bottom of the tool, not the middle. If I had to speculate, I would guess that is perhaps what the "A" in 2591A is designating.
Snap-on introduced a "new" stud remover, with the sliding grip, part number A-50, in 1934 (see Catalog K, page 17). No patent citation, because it was applied for (in 1933) but not yet granted. That is the type which Unaiu posted above. In Catalog N (1939), at the very bottom of page 15, they show the A-50 and the A-36 together, and the patent number is very clearly
only under the A-50 sliding type.
Snap-on continued making the eccentric wheel grip type (A-36) and the sliding grip type (A-50), and added new types (e.g., pressure grip and release jaws, etc) that we don't need to get into here.
To go back to the Snap-on date codes that opened up this whole rabbit hole to begin with, I think it's almost certain that Bonney was sourcing the 2591, at least the A type, from Snap-on in the late 70's and 80's.
Who patented the eccentric wheel type that Snap-on and Bonney were both independently using as early as 1933 remains a mystery. I will say, in an ironic twist of fate, that it's possible that Bonney was supplying Snap-on! The description for the A-36 in the 1933 catalog explicitly mentions that the wheel is made of a "new and special alloy steel"!
