Pretensioner for seat belts
First Claim
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1. A seat belt pretensioner device, comprising:
- a fixed base unit defining an arcuate elongated chamber centered around a pivot center;
an arm rotatably supported by said fixed base unit so as to be rotatable around said pivot center, said arm including a free end attached to a seat belt buckle, and a projection slidably received in said elongated chamber;
a power generator adapted to produce a pressure by means of a combustion of a propellant provided at an end of said elongated chamber; and
a bladder provided at an end of said power generator from which a gas is produced, said bladder designed to receive and contain said gas therein upon activation of said power generator so that said arm may be turned in a direction to pull said seat belt buckle and increase tension in a seat belt.
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Abstract
Disclosed is a seat belt pretensioner device for moving a moveably supported seat belt buckle in a direction to increase the tension of a seat belt with a power generating device so as to automatically increase the tension of the seat belt in case of an impact situation. such as a vehicle crash. The power generator comprises a bladder-like member that can be pressurized for expansion, and a chamber defined for guiding the direction of the expansion of the bladder-like member. The buckle of the seat belt can be moved in the direction to increase the tension of the seat belt by pushing a member supporting the buckle with the bladder-like member.
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Citations
9 Claims
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1. A seat belt pretensioner device, comprising:
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a fixed base unit defining an arcuate elongated chamber centered around a pivot center;
an arm rotatably supported by said fixed base unit so as to be rotatable around said pivot center, said arm including a free end attached to a seat belt buckle, and a projection slidably received in said elongated chamber;
a power generator adapted to produce a pressure by means of a combustion of a propellant provided at an end of said elongated chamber; and
a bladder provided at an end of said power generator from which a gas is produced, said bladder designed to receive and contain said gas therein upon activation of said power generator so that said arm may be turned in a direction to pull said seat belt buckle and increase tension in a seat belt. - View Dependent Claims (2, 3, 4, 5)
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6. A seat belt pretensioner device, comprising:
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a fixed base unit defining an arcuate elongated chamber centered around a pivot center;
an arm rotatably supported by said fixed base unit so as to be rotatable around said pivot center, said arm including a free end attached to a seat belt buckle, and a projection slidably received in said elongated chamber;
a power generator adapted to produce a pressure by means of a combustion of a propellant provided at an end of said elongated chamber; and
a packing member attached to said arm to define, in cooperation with said elongated chamber of said fixed base unit and said projection of said arm, an enclosed chamber to receive and retain therein a gas produced from said power generator upon activation of said power generator so that said arm may be turned in a direction to pull said seat belt buckle and increase tension in a seat belt. - View Dependent Claims (7, 8, 9)
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Specification