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Safety device for a seat occupant

  • US 3,178,225 A
  • Filed: 02/01/1963
  • Issued: 04/13/1965
  • Est. Priority Date: 02/01/1963
  • Status: Expired due to Term
First Claim
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1. A SAFETY DEVICE FOR A SEAT OCCUPANT COMPRISING A HOUSING, A REEL CARRIED BY SAID HOUSING FOR ROTATIONAL MOVEMENT IN OPPOSITE DIRECTIONS, A FLEXIBLE ELONGATED ELEMENT CONNECTED AT ONE END TO SAID REEL SO AS TO BE WOUND UP ON SAID REEL IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID REEL IN ONE DIRECTION, RESILIENT MEANS ACTING BETWEEN SAID HOUSING AND SAID REEL FOR RESILIENTLY URGING SAID REEL TOWARD A LIMITING POSITION IN SAID ONE DIRECTION OF ROTATIONAL MOVEMENT WHEREIN A MAXIMUM AMOUNT OF SAID ELONGATED ELEMENT IS WOUND AROUND SAID REEL, THE OPPOSITE END OF SAID ELONGATED ELEMENT BEING ARRANGED TO BE OPERATIVELY CONNECTED WITH THE SEAT OCCUPANT SO AS TO PAY OUT FROM SAID REEL AND EFFECT ROTATIONAL MOVEMENT OF SAID REEL IN THE OPPOSITE DIRECTION AGAINST THE ACTION OF SAID RESILIENT MEANS IN RESPONSE TO MOVEMENTS OF THE SEAT OCCUPANT IN A DIRECTION AWAY FROM A NORMAL ERECT POSITION WITH RESPECT TO THE SEAT, MEANS CONFINING A BODY OF HYDRAULIC FLUID, MEANS OPERATIVELY CONNECTED WITH SAID REEL FOR APPLYING PRESSURE TO SAID BODY OF HYDRAULIC FLUID IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID REEL IN SAID OPPOSITE DIRECTION AND FOR APPLYING A BRAKING ACTION TENDING TO PREVENT ROTATION OF SAID REEL IN SAID OPPOSITE DIRECTION IN RESPONSE TO A PREDETERMINED ELEVATED PRESSURE CONDITION IN SAID BODY OF HYDRAULIC FLUID, AND MEANS DEFINING FLOW PATH MEANS FOR SAID BODY OF HYDRAULIC FLUID PROVIDING FOR A RELATIVELY UNRESTRICTED FLOW IN SAID BODY OF HYDRAULIC FLUID AT ROTATIONAL SPEEDS OF SAID REEL IN SAID OPPOSITE DIRECTION BELOW A PREDETERMINED VALUE WHICH CORRESPONDS WITH A SPEED GREATER THAN THOSE IMPARTED THERETO BY NORMAL OCCUPANT MOVEMENTS BUT LESS THAN THOSE IMPARTED THERETO BY ABNORMAL OCCUPANT MOVEMENTS SO THAT SUCH NORMAL MOVEMENTS CAN TAKE PLACE WITHOUT THE PRESSURE OF SAID HYDRAULIC FLUID BODY REACHING SAID PREDETERMINED PRESSURE CONDITION AND HENCE WITHOUT APPLYING SAID BRAKING ACTION ON SAID REEL AND PROVIDING FOR RESTRICTION TO THE FLOW OF HYDRAULIC FLUID AT ROTATIONAL SPEEDS OF SAID REEL IN SAID OPPOSITE DIRECTION ABOVE SAID PREDETERMINED VALUE SO AS TO CAUSE THE PRESSURE IN SAID HYDRAULIC FLUID BODY TO REACH SAID PREDETERMINED PRESSURE CONDITION AND HENCE SAID BRAKING ACTION TO BE APPLIED.

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