The invention, we imagine, would likely replace the rider-operated lower-leg pressure relief valves found on 2023 Rockshox ZEB, Lyrik, and Pike forks.
? The former claimed that SRAM were infringing upon their own patent which describes the use of valves operable by the rider to equalize pressure between the ambient environment and the space inside of their fork lowers. The valves serve to relieve pressure built up inside the lowers during hard riding , or indeed any pressure differential between the two environments, as which would also arise from elevation changes, or traveling from one extreme of weather to the next with your bike.
A new SRAM patent published December 29, 2022 describes an automatic venting system for a telescopic suspension fork that eliminates the need for any rider input, aside from riding the bike as normal, that is.
In those designs, the simple telescopic movement of the stanchions relative to the lower legs during compression and rebound events would allow an exchange of air between the two spaces, equalizing any pressure differential that may exist as the main K-seal passes the dimples. Importantly, in all designs, airflow is bi-directional.
Of course, if air can be exchanged between the two environments, then it stands to reason that moisture, dirt, and oil could, too. The patent describes use of an “air permeable absorbent” material sitting just underneath the dual-lipped wiper seal that would prevent any lubrication oil inside the lower legs from escaping. This sounds much like a generic foam ring that would be found inside any modern suspension fork.
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