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A typical break-action, double-barreled shotgun. A way of closing the breech or chamber is an essential part of any breech-loading weapon or firearm.Perhaps the simplest way of achieving this is a break-action, in which the barrel, forestock and breech pivot on a hinge that joins the front assembly to the rear of the firearm, incorporating the rear of the breech, the butt and usually, the ...
To prevent the rudder from rising out of the gudgeons there is often some preventer such as rudder weight or a locking device slid across the path of the pintle's removal from the upper gudgeon (also referred to as a Rudder Stop). [3] High-quality gudgeons have bushings, (plain bearing) either a solid sleeve, flanged or clenched. This will ...
As a weapon mount, a pintle mount is used with machine guns as the mounting hardware that mates the machine gun to a vehicle or tripod. Essentially, the pintle is a bracket with a cylindrical bottom and a cradle for the gun on top; the cylindrical bottom fits into a hole in the tripod while the cradle holds the gun.
Most conversions modified rather than replaced the lock mechanism of the firearm being converted [20] while lock designs in new models of longarms were largely unchanged. Some designs emerged, such as Maynard carbine [ 21 ] and the pellet feed system employed by the Sharps carbine , [ 22 ] [ 23 ] which mechanised the recharging of the primer ...
Rotating bolts are found in delayed blowback, gas-operated, recoil-operated, bolt action, lever-action, and pump-action weapon designs. In some forms of delayed blowback, the rotating bolt is used as the delay mechanism: the bolt head rotates as the firing pin strikes, locking the chamber until the gas pressure reaches a safe level to extract.
The locking bar system allows for even stress to be distributed and prevent canting of the scope mount. Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place.
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A swivel caster with a wheel lock. The vertical swivel on this type of caster cannot be locked in position. Caster central locking mechanism on an old Stryker hydraulic stretcher. Shown in the locked position with the center cam rotated downward. Common inexpensive casters may include a brake feature, which prevents the wheel from turning. This ...