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Topic: Breechblock

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	CHAPTER-9-B (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		As the breechblock moves to battery position, the breechblock slides and slide key carry the firing pin forward, causing its tip to protrude from the breechblock bolt and fire the round.
		The breechblock and extractor move backward until the tip of the fired case strikes the stationary ejector prongs, pivoting the empty case out of a hole in the bottom of the receiver and out of the gun.
		The breechblock lock seats against the breechblock-locking key in the receiver, and is held by the rear lower surface of the breech-block slides.
	www.eugeneleeslover.com.cob-web.org:8888 /USNAVY/CHAPTER-9-B.html (3479 words)

	CHAPTER-9-D
		The breechblock is a vertical sliding-wedge type, similar in principle to that of the 5”/38.
		When the gun is in battery and the breechblock is in its held-down position, the hold-down lever bears on the hold-down arm of the breech operating shaft, preventing rotation of the shaft and closing of the breech.
		The breech interlock latch lever, the first mechanism in the chain of linkages from the breech face to the loader control lever, is pivoted in the shell-lock carrier next to the shell lock and extends down the breech face, partially in front of the breech opening.
	www.eugeneleeslover.com /USNAVY/CHAPTER-9-D.html (2966 words)

	FM 23-11 Chptr 2 Mechanical Training
		When the lockring is rotated to the unlocked position and the breechblock is swung to the open position, it pivots on the hinge pin (4, fig.
		A tooth on the inner hinge portion of the breechblock engaged in a recess on the extractor link (6, fig.
		As the breechblock is swung to the closed position, the tooth on the inner hinge portion of the breechblock retracts the extractor link (6, fig.
	www.globalsecurity.org /military/library/policy/army/fm/23-11/Ch2.htm (4746 words)

	Breechblock for automatic firing weapon - Patent 3969983
		A breechblock or breechblock arrangement for an automatic firing weapon with a breechblock carrier in which there is rotatably and axially displaceably mounted a substantially cylindrical breechblock body, a control bolt arranged transversely with respect to the breechblock body axis and which penetrates through the breechblock body.
		Owing to the gas pressure the breechblock carrier 6 is displaced in conventional manner towards the rear and specifically initially by the retracting weapon barrel 1 and subsequently by a not particularly illustrated plunger, whereby the breechblock carrier 6 carries out a relative movement with respect to the breechblock body 8.
		The relative movement between the breechblock body 8 and the breechblock carrier 6 occurs initially when the breechblock body has reached its forwardmost position and the teeth 10 of the breechblock body 8 are located in the peripheral groove 5 of the weapon barrel 1.
	www.freepatentsonline.com /3969983.html (1201 words)

	Class Definition for Class 42 - FIREARMS
		The breechblock turns about a central fixed axis, which is perpendicular to the longitudinal axis of the barrel like a faucet valve, to open and close the breech.
		The barrel, to open the breech, is made to swing to one side on a pivot, or axis parallel to the length or axis of the barrel.
		The breechblock, in opening the breech, is made to slide rearward substantially in line with the barrel.
	www.uspto.gov /web/patents/classification/uspc042/defs042.htm (2897 words)

	Firearms Primer: Rifles - Americans for Gun Safety (AGS) Foundation
		The lever action rifle's breechblock, an oblong steel block carrying the extractor and firing pin, is locked and unlocked by the action of the operating lever.
		When all factors are in proper balance, the effect of the gases on the breechblock will cause the breechblock to be sent on its rearward journey after the bullet has exited the bore and the sideways pressure forcing the cartridge case tightly against the receiver walls has subsided.
		Once the barrel's motion is halted, a cam unlocks the breechblock from the barrel, allowing it to continue traveling to the rear, during which time it extracts and ejects the cartridge case, cocks the hammer, and compresses the recoil spring.
	w3.agsfoundation.com /safety/p_rifles.html (1800 words)

	Single shot rifle having falling breechblock integral with stock - Patent 4128956
		The so-called falling breechblock generally comprises a breechblock assembly which is mounted for somewhat vertical movement between the barrel receiver and the stock usually in a sort of cavity or space which is defined between the receiver and the stock and sometimes covered with metal plates.
		The breechblock 40 includes an elongated flat plate portion 46 in which there is formed a large cavity 48 in which there is mounted a hammer 50 and trigger 52 which are attached by respective pivots 54, 56.
		There is a notch 62 in the face of breechblock 40 having an edge 63 which trips the extractor 28 upon downward movement of the breechblock 40 and the notch 62 operates on the tip 33 of extractor 28.
	www.freepatentsonline.com /4128956.html (1527 words)

	Blocking device for the breechblock in a gun - Patent 5058482 (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		The present invention relates to a blocking device for a wedge-type breechblock in a gun, and more particularly to a blocking device of the type which is arranged parallel to the bore axis of the gun and which includes a detector.
		The kinetic energy of the closing breechblock, which must be decelerated at once, may cause damage to the sealing system of the base ring, particularly at the contact faces of the obturating ring.
		In both embodiments, the breechblock may be blocked directly in the open breechblock position before the breechblock closing movement starts, or a beginning closing movement of the breechblock wedge may be interrupted in a known manner.
	www.freepatentsonline.com.cob-web.org:8888 /5058482.html (2868 words)

	Panzerbüchse Pz.B.38 & Pz.B 39 Anti-Tank Rifles
		Remove the trigger pistol-grip group and for one type of label used to identify ammunition for the antitank rifle breechblock from the receiver by pulling downward on the pistol grip.
		Disengage the breechblock from the trigger pistol-grip by sliding the breech out along the grooves in its sides.
		The breechblock can be stripped by pressing on the spring-loaded button and sliding the plate upward.
	efour4ever.com /panzerbuchse.htm (781 words)

	Firearms Tech Museum Glossary A
		The breech closure is achieved by longitudinal movement of the breechblock parallel to the axis of the bore.
		When the bullet is discharged the pressure of the gas starts to move the locked bolt and barrel rearward, the barrel strikes a stop that withdraws its locking device from the breechblock, slide or bolt, which in turn continues rearward to eject the fired case and prepare for the reloading motion.
		In long recoil weapons the breech and barrel remain locked for the full distance of the recoil stroke, the barrel is then unlocked and thrust forward while the bolt is retained to eject the case and reload the chamber.
	www.firearmsmuseum.org.au /Survey/Glossary/GlosA.htm (1079 words)

	Genitron.com - Glossary of Handgun Terms
		Blowback is used in comparatively low powered weapons, in which inertia of the breechblock, and cartridge wall adhesion against the chamber, are sufficient enough to retard opening until breech gas pressures have fallen to a safe level.
		A semi-automatic pistol in which the barrel and breechblock are locked together for the full distance of rearward recoil travel, after which the barrel returns forward, while the breechblock is held back.
		Refers to a semi-automatic pistol in which the barrel and breechblock are locked together for only a short distance of rearward recoil travel, at which point the two are uncoupled, the barrel is stopped and the breechblock continues rearward, extracting the spent casing from the chamber.
	www.genitron.com /Glossary.html (2288 words)

	Cutting Tool Engineering MAGAZINE (Site not responding. Last check: 2007-11-07)
		As the breechblock travels toward the back of the receiver, the shell ejector on the breechblock directs the spent shell through the hole in the floor of the receiver.
		As the slide reverses direction and moves the breechblock forward in the pump cycle, the new shell is fed into the chamber as the breechblock moves forward and locks in place.
		The receiver--the section of the shotgun housing the trigger, breechblock, shell carrier and feed-ejector slide assemblies-- is made from a 7-lb.
	www.cuttingtoolengineering.com /articles/092001/0109_repeatperform.htm (2497 words)

	Device for manually opening a wedge breechblock and gun equipped with such a device - Patent 5675108 (via CobWeb/3.1 ... (Site not responding. Last check: 2007-11-07)
		A manual breechblock opening device that actuates a breechblock lever to open a wedge breechblock of a gun against an elastic return force includes a manual control member, a drivetrain and a holder.
		The manual breechblock opening device can include a holder attached to the gun that is disposed to hold the manual control member during recoil of the gun.
		The sleeve 4 is attached in known fashion to a rear end of the gun 1 on a tube that slides in a cradle 2 and on a plate 3 that is integral with the cradle 2.
	www.freepatentsonline.com.cob-web.org:8888 /5675108.html (2300 words)

	Firearm October 2006: Session 3 (Site not responding. Last check: 2007-11-07)
		Breechblock is marked “1870 / eagle head over crossed arrows / US”.
		Although this rifle falls in the serial number range of the Model 1877, it retains the high arch breechblock, and thus must be considered a Model 1873.
		Replacement breechblock does not quite fit, but can be made to work.
	www.jamesdjulia.net /firearm/oct06/firearm_oct06_s3.asp (12817 words)

	Europe discovers the cartridge: the American Civil War spurs worldwide firearm development Guns Magazine - Find Articles
		The most common means of accomplishing this was through the addition of the pivoting breechblock, known in the US as the Allen conversion and readily recognizable as the Springfield-Allen.50-70s.
		The Wanzl was a pivoting breechblock conversion performed on a wide variety of Austro-Hungarian muzzleloaders from the 1840s and '50s.
		Nonetheless, the pivoting breechblock design is found in several purpose-built designs, including the Berdan I, credited to Hiram Berdan, the less than stellar Union officer behind the creation of the 1st and 2nd US Sharpshooter Regiments during the Civil War.
	www.findarticles.com /p/articles/mi_m0BQY/is_8_52/ai_n16498982 (907 words)

	Swedish m/1867-89 (Site not responding. Last check: 2007-11-07)
		In addition to new breechblocks and hammers, the older extractor was replaced with a newer design.
		The projection on breechblock is a firing pin retractor.
		When the breechblock is pulled back, the retractor forces the firing pin back into the breechblock to avoid accidental firing when the breechblock is closed.
	www.angelfire.com /in2/dutchman/SwedeRB.html (244 words)

	Reinstalling the Breechblock
		Using the heel of your hand, press on the rear of the breechblock, and at the same time slowly open the lever.
		I've found the best way is to keep pressure on the rear of the breechblock while you slowly move the operating lever up and down.
		Reinstall the breechblock split pin with a rubber or wood mallet, test for proper operation, by cocking and dry firing (preferably with a snap cap in the chamber and the weapon pointed in a safe direction).
	www.martinihenry.com /qbbr.htm (456 words)

	Browning 1900 assembly in Guns World
		Unscrew and remove the breechblock screws (5) (6), and move the slide forward off the frame (26).
		Push te extractor outward until its lug clears the side of the breechblock.
		Depress the trigger and start the breechblock assembly into the frame until resistance is felt, then release the trigger and push the breechblock fully home.
	www.gunsworld.com /assembly/browning1900_ass_us.htm (462 words)

	Trapdoor Tech page
		The action consists out a breechblock wich closed the chamber.
		In the breechblock is a drilled hole from the back to the front to hold the firingpin.
		The hammer is an external type at the side of the lockplate wich hits the firingpin at the back of the breechblock.
	members.tripod.com /Cyberdutch/tech.html (275 words)

	arty (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		The handle to the top of the breech is used to open the breechblock when it is closed.
		Once the Projectile and Propellant are inserted, the Cannoneer raises the Cam Arm and the Breechblock swings shut and turns Clockwise to engage the Interrupted Screw Lands to the locked closed position, ready for firing.
		Assuring the red igniter pad is visible the soldier then closes the breech, adds a small M82 primer, pulls closed the firing mechanism block assembly and attaches the firing lanyard.
	1how.net.cob-web.org:8888 /arty.htm (651 words)

	Blowback Operated
		The bolt is held closed by spring pressure and the mass of the breechblock.
		The bolt slide or breechblock is fairly heavy in these weapons when compared to the weight of the bullet and power of the cartridge.
		This is based on the principle of operation that the recoil force exerted on the mechanism must overcome some form of mechanical disadvantage, momentarily holding the breechblock closed until the bullet had cleared the muzzle of the weapon.
	www.tpub.com /gunners/55.htm (719 words)

	Reference.com/Encyclopedia/Breechblock (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		A breechblock (or "breech block") is the part of the firearm action that closes the breech of a weapon (whether small arms or artillery) at the moment of firing.
		Most modern small firearms use a rotating breechblock, better known as a bolt, first used in manually operated bolt action weapons, but later operated by the power of the cartridge in automatic weapons.
		blowback - in which the breechblock is closed by a powerful spring; a variation of this is the "Delayed blowback" found in many weapons from Heckler & Koch
	reference.com.cob-web.org:8888 /browse/wiki/Breechblock (212 words)

	Sharps Breechloader
		The invention by Christian Sharps was of a vertical sliding block at the rear end of the barrel.
		The sliding breechblock allowed the Sharps to be loaded from the back end instead of from the muzzle before the invention of metallic cartridges.
		Nearly all of the pre-War Sharps were made with the breechblock at a slight angle from perpendicular to the barrel.
	www.hackman-adams.com /guns/sharps.htm (565 words)

	Rolling block bonanza: just when you thought supplies had dried up Guns Magazine - Find Articles
		The relationship of the rotating breechblock and the rotating, locking hammer is precise and calls for close dimensional machine tool work, quality steels and proper heat treatment.
		The two main parts, the hammer and the breechblock, are massive and rotate on large pins (.455" in diameter in the case of the original No. 1 action).
		In addition, when the breechblock is back, one has unobstructed access to the chamber, bore, and breechblock for cleaning purposes.
	findarticles.com /p/articles/mi_m0BQY/is_7_51/ai_n13785369 (992 words)

	Breechblock Disassembly
		Near the center of the breechblock, you'll notice the slotted stop nut (the piece that keeps the striker spring in the block) and the slotted end of the striker itself.
		You may notice the white goo at various places on this breechblock.
		Tip the end of the breechblock downward enough for the striker to slide out the back of the block.
	www.martinihenry.com /bb.htm (458 words)

	Krag-Petersson - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		Moving the lever in a half circle counter clockwise made the breechblock – the part of the mechanism that seals the rear of the barrel – move back and down.
		the breechblock moves downwards as the mechanism is opened, actuated (operated) by the operation of the exterior hammer.
		This rising of the breechblock (by means of a powerful spring) could catch the shooter off guard, resulting in pinched skin on the thumb.
	en.wikipedia.org.cob-web.org:8888 /wiki/Krag-Petersson (2057 words)

	ED YOST SINGLE SHOT 22 RIMFIRE SCHUETZEN RIFLE. ED YOST 22 FALLING BLOCK ACTION (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		Additional: The "Striker-pin bushing" (which screws into the breechblock face) must be replaced with a newly made "rimfire" version, or it must be modified with the addition of a second hole for the rimfire pin.
		The striker bushing in the breechblock is made removable for is easy replacement if required.
		If the breechblock is modified with a striker bushing having 2 holes, it would be possible to modify the striker with a "changeable" pin in order to switch back-and-forth between rimfire and centerfire.
	www.yostaction.com.cob-web.org:8888 /yost22.html (778 words)

	breechblock (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-11-07)
		The movable piece which closes the breech of a breech-loading firearm, and resists the backward force of the discharge.
		It is withdrawn for the insertion of a cartridge, and closed again before the gun is fired.
		From WordNet r 1.6 [wn]: breechblock n : a metal block in breech-loading firearms that is withdrawn to insert a cartridge and replaced to close the breech before firing [syn: {breech closer}]
	www.beetfoundation.com.cob-web.org:8888 /words/b/breechblock.html (144 words)

	German Luger Pistol P08 Field Stripping-Assembly Disassembly in Guns World
		Toggle and breechblock assembly can now be withdrawn from the rear of receiver.
		Invert toggle and breechblock assembly and insert a screwdriver blade in slot in firing pin spring guide (24) in rear of breechblock (17).
		Extractor, (21) may be removed by holding thumb over top of breechblock and extractor out and extractor spring (20) may now be lifted out of its seat.
	www.gunsworld.com /assembly/luger_ass_us.htm (348 words)

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