Scott® AV-2000/3000 SCBA Bayonet to 40MM NATO (RD40x1/7) Adapter =================================================== This prototype design for a Scott® AV-2000/3000 SCBA bayonet to 40MM NATO (RD40x1/7/DIN) gas mask thread adapter. Designed to help cross compatibility of commercial off the shelf (COTS) filters with other manufacturer’s respirators during this PPE shortage. In this particular instance an adapter for self-contained breathing apparatus, that many fire departments use, can now be compatible with any RD40x1/7 filter canisters or step down adapters to other respirator manufacturer filter cartridges.
If your fire department does not have access to 40MM (RD40x1/7) filters, you can use the following adapters to step down to COTS filter cartridges from these companies below:
40 MM NATO to 3M™ Bayonet Adapter https://www.thingiverse.com/thing:4245358
40 MM NATO to MSA® Bayonet Adapter https://www.thingiverse.com/thing:4265715
40MM NATO to MSA® Comfo Classic Adapter https://www.thingiverse.com/thing:4267676
40MM NATO to Honeywell/Honeywell North® Adapter https://www.thingiverse.com/thing:4268775
40MM NATO to AOSafety® Threaded Adapter https://www.thingiverse.com/thing:4273365
40 MM NATO to AOSafety® R5700 8051 Bayonet Adapter https://www.thingiverse.com/thing:4265538
And for our brother and sister firefighters overseas:
40MM NATO to Portwest® Bayonet Adapter https://www.thingiverse.com/thing:4273464
40MM NATO to Moldex® 7000/9000 Series EasyLock® Bayonet Adapter https://www.thingiverse.com/thing:4275446
40MM NATO to Secura BC Bayonet Adapter https://www.thingiverse.com/thing:4294187
40MM NATO to JSP® Force™8 Filter Adapter https://www.thingiverse.com/thing:4294203
Alternatively, if you your department cannot source COTS filters, search thingiverse, there are a number of other DIY filter adapters to each major manufacturer, 3M/MSA/etc. respirator's specific attachment as well.
Part Description: ============= SCOTT_AV3000_SCBA_BAYONET_TO_40MM_NATO_ADAPTER_GEN1.stl Initial model release.
SCOTT_AV3000_SCBA_BAYONET_TO_40MM_NATO_ADAPTER_INHALATION_GASKET_GEN1.stl Required inhalation gasket to adapt SCBA mask for respirator use.
SCOTT_AV3000_SCBA_BAYONET_TO_40MM_NATO_ADAPTER_BAYONET_GASKET_GEN1.stl Required bayonet gasket to ensure proper seal from adapter to SCBA mask.
40MM_NATO_GASKET_GEN1.stl Required gasket to ensure proper seal from 40MM NATO filter/adapter to interior pocket of RD40X1/7 threads.
Disclaimers/Risks: ============== 1.) Requires 40 mm OD gasket or o-ring on the interior pocket for RD40x1/7 threads. I’ve included an .STL for 40MM NATO Gasket for reference or to print with TPU.
2.) Requires inhalation gasket. I do not have a Scott AV-3000 SCBA mask, but based on pictures I did not see an inhalation gasket. Which would make sense for positive pressure system for a self contained breathing apparatus. Therefore to properly function for CBRN use, there should be an inhalation gasket. I’ve included an .STL file for the inhalation gasket to print with TPU.
3.) Requires bayonet gasket to seal adapter to SCBA mask. I’ve included an .STL to print with TPU.
4.) Adapter does not feature an SCBA locking mechanism/latch. Since I do not have a Scott AV-3000 SCBA mask for reference, I couldn’t get a good estimate for the locking notch, and conceive of a locking mechanism or interface. Therefore, be sure to continually check to ensure adapter tighten down. User maybe able to shim or stack the bayonet gasket to ensure a tighter fit.
5.) 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals. 3D printing this adapter is only a temporarily ad-hoc solution against biological threats. Once supply chain return to normal users should purchase OEM OSHA/NIOSH/EN standard approved adapters and respirator accessories.
Dev. Notes: ========= 04/16/2020 - Initial model release. In work, pending support 3D printing community for any fitment and model revisions.
Credits: ====== Thanks to rjcroghan for creating an novel Scott AV-3000 DIY filter assembly. https://www.thingiverse.com/thing:4265991
His model enabled me to pull reference the bayonet geometry to design this SCBA adapter.