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An interrupted screw has a section of thread along its axis removed. The screw is mated with a partially threaded hole in the receptacle: threadless channels in the breechblock screw line up with the threaded parts of the receptacle, and vice versa. The screw can thus be smoothly inserted all the way
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The amount of rotation required to achieve full closure depends on the number of unthreaded sectors. The minimum balanced arrangement has two sectors of 90°, and requires 1/4 turn to lock. three sectors of 60° requires 1/6 turn to lock, and the typical arrangement on a diving helmet, four sectors of
177:"dissected screw breech" with "sectional screws" "cut therein for the purpose of speedily opening the breech for swabbing, depositing the load, and readily closing it again when the gun is to be discharged". His gun was built and tested with metallic cartridges, center-primed with a
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Interrupted screws are occasionally seen in loose gunpowder rifles, as this mechanism was historically one of the few practical ways to achieve a gas-proof seal with a breech-loading firearm that does not employ metallic
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The major weakness of the original designs was that only half of the circumference of the breechblock could be threaded, hence a fairly long breechblock was still required to achieve a secure lock.
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The
History of Science and Technology: A Browser's Guide to the Great Discoveries, Inventions, and the People who Made Them, from the Dawn of Time to Today
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In the artillery application, the screw is set into the breechblock and mated with a partially threaded hole at the rear of the weapon's chamber.
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The system has also been used to close other applications, including the joint between helmet (bonnet) and breastplate (corselet) of
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into the receptacle, after which as little as one-eighth of a turn can engage the two sets of threads securely, sealing the joint.
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The system has also been used to close other devices, including the joint between helmet (bonnet) and breastplate (corselet) of
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Breech from
Russian 122 mm M1910 howitzer, modified and combined with 105 mm H37 howitzer barrel
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in 1872, and all interrupted screw breeches with this system were generally known as the De Bange type.
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of 1890. This design has threads of the block and breech cut in steps of successively larger
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recommended more developments, but the system was too expensive for the time and cheaper
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294:"Deep Sea Diving: Assembling the Deep Sea Outfit – 1963 – US Navy Training"
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American engraver
Benjamin Chambers, Sr. received a patent in 1849 for a
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solved this problem with his stepped interrupted screw design: the
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Mechanical device used to effect a closure using a partial rotation
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Bunch, Bryan; Bunch, Bryan H.; Hellemans, Alexander (2004).
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guns. It is believed to have been invented in 1845.
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80:Learn how and when to remove this message
43:This article includes a list of general
310:Hinman, Janet Evans (August 28, 2019).
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373:Interrupted Threads Used On Naval Guns
312:"Stamped in Time: The "Chambers Shop""
199:Breech sealing was improved with the
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368:Interrupted Screw Breech Mechanisms
350:Naval Armament: Pamphlet Collection
49:it lacks sufficient corresponding
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272:. Houghton Mifflin. p. 355.
163:Illustration of M109 breech plug
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240:standard diving suit
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217:Welin breech block
201:de Bange obturator
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62:introducing
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250:References
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213:Axel Welin
70:April 2023
45:references
114:artillery
207:Weakness
353:. 1874.
299:YouTube
183:US Navy
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