I do not know if anyone ever patented the side swing cyl. If they did, I would assume it was done by 1876, when Winchester was getting a patent on something in this revolver. That patent may or may not have included the side swing, but I doubt it.
As I've already said, Colt was making side swings 5 years before this patent. I doubt they would have neglected to patent the side swing if it could still be done. Colt spent a miserable 16 years when they could not make cartridge guns because of the Rollin White patent which S&W controlled!
Below this quoted patent is the last page of it with what is actually being patented outlined in red.
As promised.
Page 1
Page 2
Page 3
Page 4
Page 5
Page 6
What DB is actually getting the patent for is outlined in red. These are IMPROVEMENTS to the side swing cylinder, NOT the side swing concept itself.
He is patenting 2 items described in 8 numbered paragraphs which would be improvements to the side swing mechanism:
1-5 and 8 are about a safety mechanism which will block the trigger when the yoke is open. I do not believe it was ever used, and it is not in the Mystery Gun.
6 and 7 refer to the spring loaded center pin which snaps into the recoil shield. This IS in the Mystery Gun, and still in use today.
So, we're back to WHY was this gun built?
What could it be testing?
It is certainly not the lockwork because they had the SA down pat before they would have built this.
It is certainly not the side swing- already been proven possible years before.
It is certainly not the ratchet or hand- they'd been turning cylinders a LONG time.
These are possibilities:
Perhaps it is merely a working platform to test whatever cartridge it is chambered for.
Perhaps it a platform to test that cartridge AND the following features. Perhaps it is just for testing these features:
>The spring loaded center pin and ejector combination covered by the above patent.
>The thumb latch and bolt combination to see if it will reliably and smoothly push the center pin out of the recoil shield.
>I also see the yoke detent which holds the yoke open. I do not believe it was built to test that feature alone.
Now, we get back to timing and a logical sequence of events-
With the spring loaded center pin, the above patent dates the gun to about 1894, or LATER.
If it was built before the Model 1896, WHY doesn't the 1896 have a thumb latch?
It was probably not built after 1902 because it has no forward lock.
If it was built after 1899, why is it a SA? If it WAS built after 1899, I must assume it was built only as a cartridge test platform. With the Mod 1899, everything mechanical on this gun has already been proven. But, if it was built as a cartridge test platform, WHY? They had #3 frames in both DA and SA laying around everywhere (it took till 1913-1914 to sell them all!), and those frames were large enough and strong enough for the 44/40. I think it is safe to assume they could handle a 1 inch 41.
So, I'm still puzzled about why this gun exists.
PERHAPS it is merely for testing the true functionality of the thumb latch and the ability of the HE to eject six large, gritty cartridges????