File:9.45inchTrenchMortarBreechDiagram.jpg

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9.45inchTrenchMortarBreechDiagram.jpg ‎(793 × 506 pixels, file size: 138 KB, MIME type: image/jpeg)

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Description

Cross-section of right-side Elevation, and Plan views of 9.45 inch (240 mm) Trench Mortar Breech and Firing mechanism as adopted by the US Army, December 1917.

Nomenclature of 9.45-inch trench mortar matériel.
BARREL, BREECH, AND FIRING MECHANISM.
Symbol Quan-
tity.		 Name of part Material Location and purpose
4A 1 Barrel Gun steel Screwed onto breech (4B)
4B 1 Breech Gun steel Screwed into barrel (4A)
4C 1 Breech slide Forged steel Fits into vertical recess (6.75 long x 2.34 inch wide) in breech (4B). Holds cartridge in place
4D 1 Locking-pin housing Forged steel Fastened to breech (4B). Contains locking pin (4F)
4E 1 Locking-pin spring Spring-steel wire Fits over pin (4F). Forces pin into hole in slide (4C)
4F 1 Locking-pin Forged steel Fastened to housing (4D). Holds breech slide (4C) open or closed
4G 1 Locking-pin nut Steel Screwed and riveted to end of pin (4F)
4H 1 Locking-pin ring Cold-rolled steel Fastened to nut (4G). Provides handle to pull out pin (4F)
4K 1 Locking-pin housing cover Steel Fastened to locking-pin housing (4D), and holds pin (4F) and spring (4E) in place
4L 2 Breech-slide stops Tool steel Fastened to breech slide (4C). Stop slide in proper position
4M 4 Fillister-head screws Steel Fasten locking-pin housing (4D) to breech (4B)
4N 1 Headless set screw Steel Locks barrel (4A) and breech (4B) together
4P 2 Countersunk-head screws Steel Fasten locking-pin housing cover (4K) to locking-pin housing (4D)
4Q 4 Countersunk-head screws Steel Fasten breech-slide stops (4L) to breech slide (4C)
4R 1 Lanyard cord Braided sash cord 6 inch long. Through plug (4S) and plunger (4W). Means of pulling back plunger
4S 1 Plug Forged steel Screws into end of housing (4U). Cover for firing mechanism
4T 1 Lanyard eye Spring-steel wire Attached to end of lanyard cord (4R)
4U 1 Housing Forged steel Screws into hole in breech slide (4C). Contains firing mechanism
4V 1 Lanyard Braided sash cord Attached to lanyard hook (4AD). Operates firing mechanism
4W 1 Plunger Forged steel Fits inside housing (4U). Delivers blow to anvil (4Y)
4X 1 Lanyard washer Steel Fits over end of lanyard cord (4R), preventing it from pulling through the plunger (4W)
4Y 1 Anvil Tool steel Fits inside housing (4U). Drives striker (4AA)
4Z 1 Striker spring Spring-steel wire Fits inside housing (4U). Returns striker (4AA) to position
4AA 1 Striker Tool steel Fits inside housing (4U). Strikes percussion cap of cartridge
4AB 1 Vent bushing Forged steel Screws into end of housing (4U)
4AC 1 Plunger spring Spring-steel wire Fits inside plunger (4W) and over plug (4S). Drives plunger
4AD 1 Lanyard hook Steel Catches in lanyard eye (4T) attaching lanyard (4V)
4AE 1 Lifting band key Steel Locks lifting band in place
4AF 1 Rope thimble Steel Fits into lanyard hook (4AD). Protects lanyard (4V)
4AG 1 Sight plug Steel A hollow cylinder (2.795 inch long x 1.75 inch at large end, 1.417 inch at small end). Fits into breech slide (4C) when aligning sight
Date
Source Based on Plate 1 and Page 63 in "Handbook of the 9.45 inch Trench Mortar Matériel", Ordnance Department, U.S.A, December 4 1917.
Author Rcbutcher

Licensing[edit]

Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
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Date/TimeThumbnailDimensionsUserComment
current02:48, 24 September 2007Thumbnail for version as of 02:48, 24 September 2007793 × 506 (138 KB)Rcbutcher (talk | contribs)
05:28, 11 September 2007Thumbnail for version as of 05:28, 11 September 2007793 × 506 (171 KB)Rcbutcher (talk | contribs)
13:56, 10 September 2007Thumbnail for version as of 13:56, 10 September 2007793 × 506 (167 KB)Rcbutcher (talk | contribs)
13:52, 10 September 2007Thumbnail for version as of 13:52, 10 September 2007800 × 405 (206 KB)Rcbutcher (talk | contribs)
13:33, 10 September 2007Thumbnail for version as of 13:33, 10 September 20071,443 × 498 (295 KB)Rcbutcher (talk | contribs)
14:59, 8 September 2007Thumbnail for version as of 14:59, 8 September 20071,165 × 497 (218 KB)Rcbutcher (talk | contribs)
11:25, 8 September 2007Thumbnail for version as of 11:25, 8 September 2007800 × 499 (169 KB)Rcbutcher (talk | contribs){{Information |Description=Diagram of 9.45 inch Trench Mortar Breech and Firing mechanism |Source=Based on diagram in "Handbook of the 9.45 inch Trench Mortar Materiel", Ordnance Department, U.S.A, December, 1917. |Date=September 8 2007 |Author= |Permissi

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