File:USArmy240mmTrenchMortarDetailedFiringMechanismMarch1918.jpg
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See Also
- 240 mm (9.45 inch) Mortar Breech Mechanism, December 1917
- 240 mm (9.45 inch) Trench Mortar Cartridge Case diagram, March 1918
- 240 mm Trench Mortar
| 240 mm Trench Mortar Detailed Firing Mechanism | ||||
| Symbol | Quan- tity |
Name of part | Material | Location and purpose |
| 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) |
| 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 |
Summary
| Description | Detailed Cross-sectional view of firing mechanism for the 240 mm Trench Mortar as adopted by the US Army, March 1918. |
| Date | |
| Source |
Based on Figure 2 in "Manual for Trench Artillery, United States Army, Part IV, 240 mm Trench Mortar".
http://cgsc.cdmhost.com/u?/p4013coll9,252 |
| Author | Rcbutcher |
Licensing
|
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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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | ||
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:22, 11 September 2007 | | 656 × 357 (138 KB) | Rcbutcher | |
| 14:33, 10 September 2007 |  | 656 × 357 (136 KB) | Rcbutcher | ||
| 14:31, 10 September 2007 |  | 1,443 × 498 (295 KB) | Rcbutcher | ||
| 14:13, 10 September 2007 |  | 656 × 357 (135 KB) | Rcbutcher | {{Information |Description=Detailed diagram of firing mechanism for the US Army 240 mm Trench Mortar, March 1918. |Source=Based on Figure 2 in "Manual for Trench Artillery, United States Army, Part IV, 240 mm Trench Mortar". Prepared at Headquarters, Amer |
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