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| Keywords: USArmy240mmTrenchMortarDetailedFiringMechanismMarch1918.jpg 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 <table style text-align left; width 100 ; border 1 cellpadding 2 cellspacing 2 > <tr align center > <td colspan 5 rowspan 1 style vertical-align top; ><span style font-weight bold; >240 mm Trench Mortar Detailed Firing Mechanism</span> </td> </tr> <tr> <td style vertical-align top; font-weight bold; >Symbol</td> <td style vertical-align top; font-weight bold; >Quan-<br>tity</td> <td style vertical-align top; font-weight bold; >Name of part</td> <td style vertical-align top; font-weight bold; >Material</td> <td style vertical-align top; font-weight bold; >Location and purpose</td> </tr> <tr> <td style vertical-align top; >4R</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Lanyard cord</td> <td style vertical-align top; >Braided sash cord</td> <td style vertical-align top; >6 inch long Through plug 4S and plunger 4W Means of pulling back plunger</td> </tr> <tr> <td style vertical-align top; >4S</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Plug</td> <td style vertical-align top; >Forged steel</td> <td style vertical-align top; >Screws into end of housing 4U Cover for firing mechanism</td> </tr> <tr> <td style vertical-align top; >4T</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Lanyard eye</td> <td style vertical-align top; >Spring-steel wire</td> <td style vertical-align top; >Attached to end of lanyard cord 4R </td> </tr> <tr> <td style vertical-align top; >4U</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Housing</td> <td style vertical-align top; >Forged steel</td> <td style vertical-align top; >Screws into hole in breech slide 4C Contains firing mechanism</td> </tr> <tr> <td style vertical-align top; >4V</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Lanyard</td> <td style vertical-align top; >Braided sash cord</td> <td style vertical-align top; >Attached to lanyard hook 4AD Operates firing mechanism</td> </tr> <tr> <td style vertical-align top; >4W</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Plunger</td> <td style vertical-align top; >Forged steel</td> <td style vertical-align top; >Fits inside housing 4U Delivers blow to anvil 4Y </td> </tr> <tr> <td style vertical-align top; >4X</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Lanyard washer</td> <td style vertical-align top; >Steel</td> <td style vertical-align top; >Fits over end of lanyard cord 4R preventing it from pulling through the plunger 4W </td> </tr> <tr> <td style vertical-align top; >4Y</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Anvil</td> <td style vertical-align top; >Tool steel</td> <td style vertical-align top; >Fits inside housing 4U Drives striker 4AA </td> </tr> <tr> <td style vertical-align top; >4Z</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Striker spring</td> <td style vertical-align top; >Spring-steel wire</td> <td style vertical-align top; >Fits inside housing 4U Returns striker 4AA to position</td> </tr> <tr> <td style vertical-align top; >4AA</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Striker</td> <td style vertical-align top; >Tool steel</td> <td style vertical-align top; >Fits inside housing 4U Strikes percussion cap of cartridge</td> </tr> <tr> <td style vertical-align top; >4AB</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Vent bushing</td> <td style vertical-align top; >Forged steel</td> <td style vertical-align top; >Screws into end of housing 4U </td> </tr> <tr> <td style vertical-align top; >4AC</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Plunger spring</td> <td style vertical-align top; >Spring-steel wire</td> <td style vertical-align top; >Fits inside plunger 4W and over plug 4S Drives plunger</td> </tr> <tr> <td style vertical-align top; >4AD</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Lanyard hook</td> <td style vertical-align top; >Steel</td> <td style vertical-align top; >Catches in lanyard eye 4T attaching lanyard 4V </td> </tr> <tr> <td style vertical-align top; >4AF</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Rope thimble</td> <td style vertical-align top; >Steel</td> <td style vertical-align top; >Fits into lanyard hook 4AD Protects lanyard 4V </td> </tr> <tr> <td style vertical-align top; >4AG</td> <td style vertical-align top; >1</td> <td style vertical-align top; >Sight plug</td> <td style vertical-align top; >Steel</td> <td style vertical-align top; >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</td> </tr> </table> Detailed Cross-sectional view of firing mechanism for the 240 mm Trench Mortar as adopted by the US Army March 1918 Based on Figure 2 in Manual for Trench Artillery United States Army Part IV 240 mm Trench Mortar <br>Prepared at Headquarters American Expeditionary Force France March 1918 <br>Reprint July 1918 <br>War Department Document No 820 A E F No 519 Office of the Adjutant General <br>http //cgsc cdmhost com/u /p4013coll9 252 2007-09-11 Rcbutcher PD-USGov 240 mm Trench Mortar 1910s technical drawings | ||||
