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 …

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 …

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 …

There are currently two types of breech mechanism in use: (i) Sliding wedge block mechanism and (ii) Screw type breech mechanism (shown in Fig. ...

bolt action, type of breech mechanism that was the key to the development of the truly effective repeating rifle. The mechanism combines the firing pin, a spring, and an extractor, all housed …

The interrupted-screw type of breech mechanism has its advantages. Since it has its own obturator mechanism, it can use propelling charges in silk bags which are consumed in firing, …

Breech Screw Mechanism. Breech screw mechanisms are made up of seven main parts: Breech ring, and possibly breech bush, Breech screw, Carrier, Attachment of the breech screw to the …

Sartoris’ system used an interrupted thread screw breech which could be unscrewed by twisting the barrel (see image #3). This would allow the chamber block to rise up to enable loading. …

An interrupted screw or interrupted thread is a mechanical device typically used in the breech of artillery guns. It was invented circa 1845. [1] It is a screw that has a section of thread along its …

The 4-inch Mark VI Breech Mechanism is of service de­ sign, embodying the Welin stepped-screw principle and a modifi­ cation of the Fletcher operating gear, (it is sometimes called the