Highly effective pre-tighter for pre-tightened safety belt

Abstract

The invention discloses a high-efficiency preloading device for preloading safety belt with simple structure, small cubage, low cost and high power transferring benefit. The invention comprise piston bar, guide head of piston bar, cylinder, gas generator, signal wire of gas generator, connecting rope, core shaft of scrolling device, power wheel, stopping claw, base and sliding way of piston bar. When vehicle impact happens sensor transfers contact signal to gas generator so as to generate blasting. Generated high-pressure gas pushes the piston bar in cylinder and the guide head of piston bar move and the connecting rope is pushed to move. The connecting rope draws the power wheel rotate. When the power wheel rotates the stopping claw is driven to move together and extrudes towards to inside. Extruded stopping claw makes the power wheel and the end of core shaft of scrolling device lock together so that the core shaft of scrolling device rotate in phase as the power wheel rotate and safety belt on it returns so as to draw crewman back and eliminate crewman gap. The preloading purpose is achieved and protecting effect of safety belt is improved.

Description

technical field

[0001] The invention relates to a pretensioning device for a safety belt, in particular to a pretensioning device for a safety belt on a driver's or a passenger's seat. Background technique

[0002] In the prior art, generally, for the comfort of the occupants, the retracting force of the seat belt cannot be too large; however, if the gap between the seat belt and the human body is too large, in the event of a collision, this existing gap will be reduced. The effective range of the seat belt is small, and the effectiveness of the seat belt is reduced. The pre-tightening seat belt uses a pre-tightening device. When the collision reaches a certain level, the pre-tightening device is activated to drive the reel mandrel to rotate in the opposite direction, shortening the seat belt webbing by a certain distance, and effectively eliminating the gap between the human body and the seat belt. The effectiveness of the seat belt is thus increased. But existing seat be...

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