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The Welin breech block was a revolutionary stepped, interrupted thread design for locking artillery breeches, invented by Axel Welin in 1889 or 1890. Shortly after, Vickers acquired the British patents. Welin breech blocks provide obturation for artillery pieces which use separate loading bagged charges and projectiles. In this system the ...
Axel Welin solved this problem with his stepped interrupted screw design: the Welin breech block of 1890. This design has threads of the block and breech cut in steps of successively larger radius. For example, this allows a breechblock with four steps to allow four-fifths of the block circumference to be threaded, allowing for a much shorter ...
It weighed 102,000 kilograms (224,872 lb), including the Welin-type breech. This used the Elswick three-motion short-arm mechanism, much like the British BL 18 inch Mk I naval gun designed around the same time. Chamber volume was 467.11 litres (28,505 cu in). [1] Rear view of the gun on display at the Yamato Museum
A breechblock (or breech block) is the part of the firearm action that closes the breech of a breech loading weapon (whether small arms or artillery) before or at the moment of firing. It seals the breech and contains the pressure generated by the ignited propellant. Retracting the breechblock allows the chamber to be loaded with a cartridge.
Large caliber breech-loading artillery became practical with French development of the obturator by Charles Ragon de Bange in 1872; and speed of reloading was improved by adaptation of the interrupted screw breech plug, which was later further improved by Axel Welin in 1890 as the Welin breech block and adopted by the Swedish. [2]
The only major advance on the original de Bange system was the introduction of the stepped screw in the Welin breech block of 1889, which greatly increased the load-bearing surface of the breech, allowing them to be made shorter, simpler, more secure and faster to operate. Other block mechanisms are also used, but the de Bange obturator remains ...
United States naval gun terminology indicates the gun fired a projectile 6 inches (15 cm) in diameter, and the barrel was 53 calibers long (barrel length is 6 inch x 53 = 318 inches or 8 meters.) [2] The gun with side swing Welin breech block and Smith-Asbury mechanism weighed about 10 tonnes and used a silk bag containing 44-pounds (20 kg) of smokeless powder to give a 105-pound (47.6 kg ...
"Third year type" refers to the Welin breech block on this gun. Breech-block design began in 1914, the third year of the TaishÅ period. This breech-block design was also used on Japanese 40 cm (16 inch), 20 cm (8 inch), 15.5 cm (6 inch), 12.7 cm (5 inch), and 12 cm (4.7 inch) naval guns. [2] This gun was not mounted aboard submarines.