How it works - Smithsonian (patent model extractor)
Posted: Wed Sep 01, 2021 5:09 am
Looking at the sketches and reading the text of U.S. Patent no. 492212, I think, I understand an unusual structure that is quite different from the Krag mechanisms we are use to.
The bolt shown in the drawings has a bolt-face intended for a rimless cartridge.
Riding 'on' and traveling 'with' the bolt is a sliding curved-metal "Dust Cover". (#43)
The non-rotating "Dust Cover" is also the "Carrier" for the Extractor.
The long Extractor body (47) is fitted into a long dovetail, milled into the under-side surface of the Dust Cover.
The front part of the Extractor has curved-arms (#49) that partially encircle the Bolt.
When the Bolt is being rotated open, the Carrier and Extractor do not rotate.
During early-rotation, the rear of the Bolt's right Locking-Lug begins to make contact with the Extractor's right curved-arm, (starting initial extraction).
When fully rotated-open, the Bolt is pulled rearward. The right Locking-Lug pushes the Dust Cover/Carrier and Extractor to the rear, completing cartridge-case extraction.
(The other day, on another gun forum that discusses Krags, someone observed that maybe some members were no longer active, because everything had already been said on the subject of Krags ...... Secretly, I laughed and laughed)!
The bolt shown in the drawings has a bolt-face intended for a rimless cartridge.
Riding 'on' and traveling 'with' the bolt is a sliding curved-metal "Dust Cover". (#43)
The non-rotating "Dust Cover" is also the "Carrier" for the Extractor.
The long Extractor body (47) is fitted into a long dovetail, milled into the under-side surface of the Dust Cover.
The front part of the Extractor has curved-arms (#49) that partially encircle the Bolt.
When the Bolt is being rotated open, the Carrier and Extractor do not rotate.
During early-rotation, the rear of the Bolt's right Locking-Lug begins to make contact with the Extractor's right curved-arm, (starting initial extraction).
When fully rotated-open, the Bolt is pulled rearward. The right Locking-Lug pushes the Dust Cover/Carrier and Extractor to the rear, completing cartridge-case extraction.
(The other day, on another gun forum that discusses Krags, someone observed that maybe some members were no longer active, because everything had already been said on the subject of Krags ...... Secretly, I laughed and laughed)!