Jamming
The phenomenon of jamming occurs in a mechanical system when the configuration of this one is such as adherence prevents any movement and thus maintains balance, whatever the intensity of the external mechanical actions.
A traditional and known example of all is that of the drawer of convenient which is put slightly in skew and “wedges itself” when one wants to close again it. Each one knows that it is not while pushing more extremely than one can reach the sought-after goal. The personal experience indicates that the drawer is immobilized all the more easily as its guidance is less deep than broad, than the drawer is charged on only one side, than one does not push in the axis, etc
Many tools, mechanisms or devices, like the key of the plumber or the screw clamp of the carpenter, use the jamming to ensure the immobilization of certain elements.
The jamming can sometimes occur in a brutal way in too worn mechanisms or badly lubricated and it can appear extremely dangerous when elements of strong inertia are suddenly immobilized. The risks are decreased by using guidance by bearing rather than guidance by slip and, in addition, the experienced mechanics know that it is always necessary to substitute, when it is possible, guidance in rotation with guidance in translation; in other words, it is to always better use pivots rather than slides.
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