Today’s invention is front and rear forks for eg a motorcycle, which are height-adjustable.
For people trying to cross very rough terrain, including rivers, riding a bike can be dangerous and fatiguiging.
In the diagram, the upper sections of the forks (grey) are like the telescopic sections of a crane (octagonal in section). These can be extended hydraulically to a suitable height by the rider and locked in position…perhaps whilst actually in motion.
Only the lower, yellow section is sprung -to allow for a normal range of suspension.