POTENCY OF A BIKE THAT CAN BE RELEASED IN ALL OR PART OF ITS DIRECTIONAL POWER

摘要

The invention relates to a bicycle handlebar stem, which can be folded in line with the front wheel of the bicycle to allow including storage and / or transport in a reduced width, possibly said gallows is made crazy for anti-theft. This stem (1) comprises in fact a unique control means (lever, lever, bonnet ...) unlocking (3) of the stem body (4) facing the core (2) which is secured to the fork pivot , this unlocking control means (3) acts on at least one pair of almost radial keys (5) (preferably never perfectly radial, in order to be automatically totally self-locking with respect to each other, it is that is, without any directional clearance between the handlebars and the wheel), which thus locks the body of the stem (4) with the core (2). The stem according to the invention is particularly intended for the storage and transport of bicycles, and possibly to serve as a lock.