ES433087A1 - Tensioning device - Google Patents

Abstract

Improvements in devices for instantaneous tensioning and deferred damping by pneumatic regulation, especially applicable to seat belts, and comprising: an external casing in which at least one piston integral with an axial connecting rod moves, topped by a union loop in which means are provided that allow gases to be released at high pressure in a reduced expansion chamber, in the initial position, at the volume located between the base of the central piston head and the anterior bottom of the device; said gases causing the displacement of the piston that exerts a traction on the stem and the union loop, or characterized by the fact that the central piston incorporates a mobile auxiliary piston maintained in the initial position by an element of weak resistance, capable of breaking when the pressure of the expansion chamber reaches a certain value corresponding to the maximum acceptable tensile stress, said auxiliary piston being permanently subjected to the effects of the pressure prevailing in the expansion chamber through at least one conduit lacking any provisional closure and the aforementioned rupture of the element of weak resistance determining a partial displacement of the auxiliary piston that activates a deferred and unidirectional immobilization element, which stops the displacement of the central piston during traction, blocking any displacement in the reverse direction until it returns to the initial position . (Machine-translation by Google Translate, not legally binding)