AOSafety® R5700 8051 Bayonet to 3M™ Bayonet Filter Adapter

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AOSafety® R5700 8051 Bayonet to 3M™ Bayonet Filter Adapter ================================================== A prototype design for AOSafety® R5700 8051 bayonet to 3M™ bayonet filter adapter intended to bring this old half face respirator back to life. AOSafety® was sold to 3M™ in 2007, and no longer produces this half mask respirator and filter cartridges. Was popular during time frame as many hardware stores, and some construction crews may still have them. To bring it back to life, I conceived the following bayonet to bayonet adapter to see how feasible it would be to make cartridge side female attachment as a test bed for future possible other adapters. Note due to older AOSafety® designed 5700 series bayonet, requires a LHS and RHS specific adapter, as certain 3M™ filter cartridges require clocking. Part Description: ============= AOS_R5700_8051_Cartridge_Side_Female_RHS_GEN1.stl AOS_R5700_8051_Cartridge_Side_Female_LHS_GEN1.stl Initial model release. AOS_R5700_8051_Cartridge_Side_Female_RHS_GEN2.stl AOS_R5700_8051_Cartridge_Side_Female_LHS_GEN2.stl Gen 2 features the following changes: (1) chamfers added to AOSafety bayonet to filter mating surfaces to reduce sharp edges that could result in wear on bayonet, and (2) added engraved markings on exterior periphery to ID adapter and whether LH/RH (Left Hand/Right Hand). Disclaimers/Risks: ============== 1.) Use Proper Gaskets and Shimming Height Under Bayonet Maybe Required Requires gasket/o-ring, below bayonet to ensure proper seal between cartridge and bayonet. Source some washer or O-ring that is nominal ID 31.115 mm or 1.225 in at the base to wrap around the base of the AOSafety® bayonet, and 3M™ 6895 Replacement Inhalation Port Gasket under the 3M bayonet. 2.) Perform Proper Negative Pressure Test Follow SSPs established by your institution or workplace for further guidance. But in general, don your respirator, adjust straps till taught against face, ensuring no obstructions around the periphery of the seal against face either due from hair, facial hair, or otherwise. Exhale deeply. Cover all inhalation ports. (Typically, most full face or half face respirators have two filters, so cover those intake ports with your hands. If your running only one filter, ensure the opposite port has filter cap in place.) Now inhale deeply. The mask should suck tightly against your face without any air leakages. Re-test if adjustments are required at gasket/o-ring interfaces at the adapter. 3.) Use At Own Risk – Temporarily Solution Only Until Supply Chain Normalizes 3D printing materials are not resistant to many solvents, are water soluble, and degrade when exposed to chemicals, heat, and UV/sunlight. 3D printing this adapter is only a temporarily ad-hoc solution against biological contagions. In addition to using a properly calibrated 3D printer, due to tolerances of adapters, if possible perform hot nozzle pass on all exterior surfaces, to reduce surface porosity. Highly recommended users apply a thin layer of polyurethane clear coat on all exterior surfaces, spray or dip based methods, to help resiliency and durability for repeated sterilization and to reduce fomite transmission in printed infill layers. Once supply chains return to normal, users should purchase OEM OSHA/NIOSH/EN standard approved respirators, adapters and accessories for their institution and workplaces. Dev. Notes: ========== 04/01/2020 - Initial model release. In work, working with local 3D printing community to produces prototype and make revisions as required to ensure fitment. 04/13/2020 - Update to model to include the following: (1) chamfers added to AOSafety bayonet to filter mating surfaces to reduce sharp edges that could result in wear on bayonet, and (2) added engraved markings on exterior periphery to ID adapters whether RH - right hand or LH - left hand.