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A sliding block is common in artillery. A vertical sliding block rises and falls while a horizontal sliding block slides to one side. It is a strong design. The breechblock is well supported by the receiver within which it slides and the mechanisms for opening and closing the breech do not have to act to any extent against the forces generated ...
A metal cup on the front of the block, together with the pressure of the screw behind it, provided "obturation" and sealed the breech to prevent escape of gasses rearward on firing. The sliding-block was known as the "vent-piece", as the vent tube was inserted through it to fire the gun. In modern terms it was a vertical sliding-block.
Falling-block action military rifles were common in the 19th century. They were replaced for military use by the faster bolt-action rifles, which were typically reloaded from a magazine holding several cartridges. [2] A falling-block breech-loading rifle was patented in Belgium by J. F. Jobard in 1835 using a unique self-contained cartridge. [3]
In a falling block or sliding block action, a solid metal breechblock "slides" vertically in grooves cut into the breech of the firearm and actuated by a lever. Examples of firearms using the falling-block action are the Sharps rifle and Ruger No. 1 .
Falling block action (also known as a sliding-block action): A single-shot firearm action in which a solid metal breechblock slides vertically in grooves cut into the breech of the rifle and actuated by a lever. In the top position, it locks and resists recoil while sealing the chamber. In the lower position, it leaves the chamber open so the ...
The gun has a split sliding-block breech mechanism. One vertically sliding block holds a Crossley-type elastomeric obturation ring (which is necessary because the propellant charges are combustible cases or bags) and is locked for firing by a second block. When the second block falls, the first is released to open the breech. [6]
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 ...
The Brandt 60mm LR gun-mortar was developed directly from the Brandt Mle CM60A1 and retains the same falling block breech mechanism reminiscent of direct fire artillery. [2] The firing pin is automatically withdrawn when the breech is unlocked, reducing the potential for misfire. [ 2 ]