Buckle retractor
AssigneeKabushiki Kaisha Tokai Rika Denki Seisakusho
InventorsYasutaka Watanabe, Kenji Matsui, Hideki Tanaka
Life of this patent
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Abstract
When gas is generated in an emergency situation of a vehicle and a cylinder is driven, one of wires rotates a pulley via a small diameter portion of the pulley. For this reason, the other wire connected to a large diameter portion of the pulley has a length wound around the large diameter portion, which is longer than that of the one wire. A drive stroke of the cylinder is increased and transmitted to a seat belt buckle. As a result, even if the cylinder is of a small size, a long pulling stroke is applied to a seat belt.
Claims17
A tensioner which applies tension to a seat belt at a time of a sudden deceleration of a vehicle, comprising:
- (a) a drive source for generating a drive stroke to apply a drive force at a time of a sudden deceleration of the vehicle;
- (b) transmission means including an elongated member for transmitting said driving force of said drive source to a portion of the seat belt so as to apply a pulling tension to the seat belt;
- and
- (c) a stroke increasing means provided in said transmission means for increasing said drive stroke from said drive source such that the scat belt is pulled by a drive stroke longer than the drive stroke of said drive source, including a small diameter pulley connected to said drive source by said elongated member and a large diameter pulley connected to a portion of said sent belt by said elongated member, wherein the width of said large pulley is substantially the same as the width of said elongated member.
A seat belt buckle retractor comprising:
- (a) a drive source which is mounted on a vehicle body and which generates a drive stroke at a time of a sudden deceleration of a vehicle to create a driving force;
- (b) transmission means including an elongated member for transmitting said driving force of said drive source to a portion of a seat belt so as to apply a pulling tension to the seat belt, and
- (c) stroke increasing means provided in said transmission means for increasing said drive stroke of said drive source and pulling a seat belt buckle so as to apply tension to a seat belt wherein the width of both said pulleys is substantially the same as said flexible member, said flexible member being wound around said small and large diameter pulleys no more than once, and
- (d) reversion preventing means which prevents movement of said seat belt buckle in a direction opposite to said direction in which said seat belt buckle is pulled.
A buckle retractor which pulls a seat belt buckle at the time of a sudden deceleration of a vehicle and applies tension to a seat belt, comprising:
- (a) a gas generator actuated at the time of a sudden deceleration of the vehicle;
- (b) a cylinder which, when the generated gas is supplied to the cylinder, drives a piston;
- (c) a first wire of which one end is connected to the piston so as to receive tension therefrom;
- (d) a small diameter pulley on which said first wire is wound;
- (c) a large diameter pulley connected to said small diameter pulley;
- and
- (f) a second wire of which one end is connected to said large diameter pulley and to which a pulling stroke of said first wire is increased and transmitted in an emergency situation of a vehicle, and another end of said second wire moving largely the seat belt buckle so as to apply tension to the seat belt, wherein the width of said small and large diameter pulley is substantially the same as said first and second wires. respectively.
Dependencies are inferred from the claim text.