Harness pretensioning device for child safety seat

Abstract

A child safety device for a vehicle including a seat and a harness, a sensor for providing an indication of a vehicle crash, and a take up assembly linked to sensor and the webbing to take up the webbing in response to the indication from the sensor.

1 . A child safety device for a vehicle, comprising:
 (a) a seat and a harness comprising webbing for securing an occupant in the seat;   (b) a sensor for providing an indication of a vehicle crash; and   (b) a take up assembly linked to sensor and the webbing to take up the webbing in response to the indication from the sensor.   
   
   
       2 . A child safety device according to  claim 1  wherein the take up assembly is located under the seat. 
   
   
       3 . A child safety device according to  claim 1  wherein the take up assembly comprises a spring loaded pivot bar. 
   
   
       4 . A child safety device according to  claim 3  wherein the pivot bar rotates to take up the webbing. 
   
   
       5 . A child safety device according to  claim 4  further comprising a ratchet mechanism for preventing the pivot bar from returning to an original position. 
   
   
       6 . A child safety device according to  claim 1  wherein the webbing comprises an adjuster strap. 
   
   
       7 . A child safety device according to  claim 6  wherein the take up device takes up the adjuster strap. 
   
   
       8 . A child safety device according to  claim 1  wherein the sensor comprises a spring.