Abstract: A system for securing a restraint system includes a retractor enclosing a spool, a sensor coupled to the spool, and a motor coupled to the spool and configured to rotate the spool about a spool rotation axis. The system also includes webbing configured to be wound and unwound from around the spool. An automatic locking retractor mode is enabled and disabled to selectively and automatically lock the retractor to prevent rotation of the spool when a predetermined length of the webbing is unwound from the spool.

Abstract: Anticipatory vehicle seat actuation, including: determining, based on sensor data capturing an environment around a vehicle, a predicted environmental state corresponding to a future time and comprising the vehicle entering a turn; determining, based on the predicted environmental state, an actuation state for one or more ECUs controlling a seat state the vehicle; and configuring the seat state of the vehicle according to the actuation state before the future time.

Abstract: The present provides a method for condition monitoring a vehicle and for alerting of irregularities/defects.

Abstract: An assembly includes a vehicle pillar elongated along an axis. The assembly includes seatbelt retractor and a webbing retractably extendable from the retractor. The seatbelt retractor is lockable from an unlocked position in which the webbing is extendable from and retractable into the retractor to a locked position in which the retractor restricts extension of the webbing from the retractor. The assembly includes a frame supported by the pillar and defining a slot elongated along the axis of the pillar. The slot has a terminal upper end. The assembly includes a seatbelt guide slideably engaged with the slot. The seatbelt retractor is below the seatbelt guide. The webbing extends upwardly from the seatbelt retractor around the seatbelt guide. The assembly includes a spring between the frame and the seatbelt guide. The spring biases the seatbelt guide against the terminal upper end of the slot.

Abstract: In this buckle device, when a second wind of a belt is pulled out from a spool, a load at which the belt is permitted to be pulled out is small, whereas slide resistance of the belt with respect to a slide face is large. When a first wind of the belt is then pulled out from the spool, the belt pull-out permitting load is large, whereas the slide resistance of the belt with respect to the slide face is small. This enables variation in a load at which extending of a buckle body is permitted to be suppressed.

Abstract: An airbag system includes a seat belt; at least one airbag disposed in at least a portion of the seat belt; and an inflator connected to the at least one airbag and supplying gas to the airbag so that the airbag is inflatable.

Abstract: A system is provided for controlling operation of an electrically controlled and magnetically actuated locking web retractor of an occupant restraint coupled to an occupant seat of a motor vehicle. A control circuit may monitor output signals produced by one or more sensors configured to produce one or more respective sensor output signals indicative of one or more corresponding sensed conditions of the motor vehicle, vehicle seat or occupant restraint, process the output signals produced by the one or more sensors to determine one or more values of the one or more sensed conditions, compare the one or more determined values of the one or more sensed conditions to one or more corresponding threshold or range values, and then provide a control signal, based on the one or more comparisons, to a magnet actuator of the web retractor to cause the web retractor to lock or unlock.

Abstract: A vehicle seatbelt device according to an embodiment includes a seatbelt that restrains a part of the body of an occupant in a host vehicle, a tension adjustment mechanism that is able to adjust a tension of the seatbelt, a recognizer that recognizes situation in the vicinity of the host vehicle, an index value deriver that derives an index value indicating an overlapping degree between a predicted traveling trajectory of another vehicle which is recognized by the recognizer and approaches the host vehicle and a predicted traveling trajectory of the host vehicle, and a tension controller that controls an operation timing of the tension adjustment mechanism on the basis of the index value derived by the index value deriver and a degree of approach of the another vehicle with respect to the host vehicle.

Abstract: An apparatus for protecting a passenger in a vehicle and a control method thereof. The apparatus includes a collision detection unit that detects a predicted collision state and a collision state of a vehicle; a seat belt driving unit that adjusts tension of a seat belt according to an operation mode; an airbag driving unit that deploys each of a plurality of airbags according to a driving signal; a capturing unit that captures images of an interior of the vehicle; an image processing unit that extracts passenger information by processing images inputted from the capturing unit; and a control unit that recognizes a passenger type and a seating position based on the passenger information, operates the seat belt driving unit by setting the operation mode, adjusts deployment time points of the plurality of airbags, and outputs the driving signal to the airbag driving unit.

Abstract: Systems and methods are provided for controlling operation of a vehicle. An example system for controlling operation of a vehicle includes one or more data collection components and one or more processors. The one or more data collection components are configured to collect data representative of a physical configuration of an interior vehicle component. The one or more processors are configured to access the collected data, determine, by processing the collected data, the physical configuration of the interior vehicle component, select a manner of operation based upon the determined physical configuration of the interior vehicle component, and cause the vehicle to operate according to the manner of operation.

Abstract: A seatbelt pretensioner system for use in a seatbelt retractor assembly having a spindle includes a frame assembly having a frame and an attachment bracket adapted to be interlocked to have an inner space for receiving the spindle, a housing adapted for being mounted to the frame and having an interior cavity, a pretensioner tube having a first tube end in fluid communication with a gas generator and a second tube end in fluid communication with the interior cavity of the housing, a pinion being rotatably mounted in the housing and fixedly coupled to the spindle adapted for taking up seatbelt webbing during pretensioning, and a pretensioner rod disposed inside the pretensioner tube. Further, the pretensioner rod has a proximal end disposed towards the gas generator and a distal end disposed away from the gas generator.

Abstract: An automobile vehicle deployable cocoon airbag system includes an airbag cushion having a first side oriented in a vertical configuration in a non-deployed condition and a second side oriented substantially ninety degrees from the first side in the non-deployed condition and adapted to receive an occupant on the second side providing an occupant sleeping position. At least one retracting tether is connected to the first side and the second side and is retracted using a retraction mechanism. The retraction mechanism acts upon receipt of a signal to retract the at least one retracting tether and pull the second side toward the first side thereby enclosing the occupant between the first side and the second side in a deployed condition of the airbag cushion. At least one energy absorbing (EA) element is connected to the airbag cushion acting to restrict a fore-aft motion of the airbag cushion.

Abstract: Redundant vehicle controls based on user presence and position are disclosed herein. A method can include determining a presence and a position of a driver in a sensing zone of a vehicle using a sensor platform integrated into the vehicle. The sensing zone is associated with a primary driving interface of the vehicle. Determining when the position of the driver indicates that the driver is not in a fully-seated position relative to a driver's seat of the vehicle, and that the vehicle is in a non-seated drive mode where the driver is permitted to operate the vehicle while not being in the fully-seated position. Activating a secondary driving interface of the vehicle when the driver is not in a fully-seated position and the vehicle is in the selected driving mode. The secondary driving interface can be used in combination with the primary driving interface.

Abstract: A seatbelt pretensioner system for use in a seatbelt retractor assembly having a spindle and a frame includes a housing adapted for being mounted to the frame and having an interior cavity, a pretensioner tube having a first tube end in fluid communication with a gas generator and a second tube end in fluid communication with the interior cavity of the housing, a pinion being rotatably mounted in the housing and fixedly coupled to the spindle adapted for taking up seatbelt webbing during pretensioning, and a pretensioner rod disposed inside the pretensioner tube. Further, the pretensioner rod has a proximal end disposed towards the gas generator and a distal end disposed away from the gas generator. In addition, the housing is formed with at least two levels including an inboard portion and an outboard portion to store the pretensioner rod after pretensioning.

Abstract: A vehicle seat having at least one buckle for receiving a safety belt on a first lateral side of the seat and an attachment of the end of a pelvic strap of the safety belt on a second lateral side of the seat. The seat includes at least one safety device, each safety device having a first cable connecting the buckle or the attachment of the end of the pelvic strap to a first anchor point, and at least one second cable connecting the buckle or the attachment of the end of the pelvic strap to a second anchor point traction on the second cable resulting in a general movement of the buckle or attachment of the pelvic strap end eliminating the risk of submarining.

Abstract: A subassembly includes a belt reel for a seat belt retractor and a drive wheel on which a belt tensioner can act to drive the belt reel in a winding direction of the seat belt, wherein between the drive wheel and the belt reel there is provided an overload clutch which includes plural shear elements, especially shear pins, each of which is inserted in an opening of the belt reel and/or of the drive wheel, the opening extending in the axial direction starting from a front side of the belt reel.

Abstract: A method for determining the tension of a drive belt, wherein the drive belt is provided for transmission of a torque generated by a drive unit to a load, for example, a door leaf of a door system includes a first process step a., the load is moved from a moving state into a rest state. In a following process step b., the motor voltage is recorded during execution of process step a. and the time-resolved motor voltage curve is prepared. In step c., the motor current is determined from the recorded motor voltage or the motor voltage curve and a time-resolved motor current curve is prepared. In a last step d., the time-resolved motor current curve is evaluated and the tension of the drive belt is determined by means of selected curve features of the motor current curve.

Abstract: Disclosed is an integrated control apparatus for active and passive safety apparatuses, which includes a sensor unit comprising a plurality of sensors for detecting a driving state of a vehicle and a controller configured to process information detected through the sensor unit, determine a driving state of the vehicle based on the processed information, compare the processed information with a preset pre-safe seat belt (PSB) threshold value, and operate a PSB for each vehicle driving state based on a result of the comparison.

Abstract: An assembly includes a housing. The assembly includes a spool rotatable relative to the housing. The assembly includes a cable fixed to the spool. The assembly includes a passenger restraint fixed to the cable. The assembly includes a pyrotechnic device fixed relative to the housing and designed to rotate the spool relative to the housing. The assembly includes a ratchet-and-pawl mechanism between the housing and the spool.

Abstract: A retractor restraint system is provided for securing wheelchairs and/or people in vehicles. The system includes a housing, a retractor reel mounted to the housing rotatably in a positive and a negative direction of rotation for receiving a belt which can be coupled to a wheelchair, an arresting unit for arresting the reel to prevent rotation in the negative direction of rotation in an operating state of the retractor restraint system, a clamping unit arranged at the housing for releasably clamping fast the belt unwound from the reel, and a triggering mechanism for actuation of the clamping unit. The triggering mechanism is coupled to the arresting unit and the reel in such a way that the clamping unit is actuated when a torque acts on the reel in the negative direction of rotation and the reel is arrested by the arresting unit.

Abstract: A seat belt pretensioner of a vehicle include: a displacement generator to generate a linear displacement in a seat frame; and a webbing guide that receives the linear displacement generated by the displacement generator and pulls a webbing. In particular, the webbing extends from a retractor fixed to the seat frame to the outside of the seat.

Abstract: The invention relates to a restraint system for a vehicle seat, comprising a webbing belt element for restraining an occupant of the vehicle seat, further comprising a guide belt element which is guided continuously on a guideway, the holding element being securely connected to a first section of the guide belt element, wherein the webbing belt element is passed through a cutout of the holding element, wherein by means of a movement of the self-contained guide belt element on the guideway in a first direction of rotation the holding element is continuously adjustable within an adjustment section of the guideway from a second maximum position to a first maximum position.

Abstract: A vehicle seat safety system. The vehicle safety seat system comprises a vehicle seat configured to move between a substantially reclining position and a substantially sitting position. The vehicle seat comprises at least a seat back and a seat bottom. The system also includes an enclosure configured to store a blanket airbag in an undeployed position prior to a collision, wherein the enclosure is disposed near the head of a passenger in the vehicle seat, and wherein the blanket airbag is ejected from the enclosure to an intermediate position in the event of a collision. The system further comprises a first electromechanical restraint system associated with the seat back and coupled to the blanket airbag by a first physical coupling and a second electromechanical restraint system associated with the seat bottom and coupled to the blanket airbag by a second physical coupling.

Abstract: A vehicle with an occupant protection function includes an occupant protection device and an occupant monitoring device. The occupant protection device is provided in the vehicle and configured to perform protection operation of supporting, with a seatbelt, an occupant in the vehicle upon collision of the vehicle. The occupant monitoring device is provided in the vehicle and configured to monitor the occupant in the vehicle. The occupant monitoring device is configured to determine whether the occupant in the vehicle is aware of the collision of the vehicle. The occupant protection device is configured to, in a case where the occupant monitoring device determines that the occupant is unaware of the collision of the vehicle, increase tension of the seatbelt gradually as compared with a case where the occupant monitoring device determines that the occupant is aware of the collision.

Abstract: A vehicle seat belt device that includes: a load transmitting member that is formed in a flexible elongate shape, an end portion, at a seat rear side, of the load transmitting member being engaged with an anchor that is secured, at a seat rear side and at a seat lower side of a seat cushion, to a vehicle body or a vehicle seat, and an end portion, at a seat front side, of the load transmitting member being engaged with a pretensioner that is provided at the seat front side and at the seat lower side of the seat cushion and which, upon activation, pulls the seat front-side end portion of the load transmitting member inside the pretensioner; and a guide portion that is provided integrally with a buckle and that abuts a middle portion of the load transmitting member.

Abstract: A seat belt buckle assembly for a motor vehicle, and also to a method for installing the seat belt buckle assembly, wherein the seat belt buckle assembly has at least one seat belt buckle, a linear belt force limiter in operative connection with the at least one seat belt buckle, and a fitting, via which fitting at least the seat belt force limiter is arranged to be body-mounted. Furthermore, the seat belt force limiter is arranged such that it can rotate on the fitting and is pivotable at least between an installation position and an operating position. To install the seat belt buckle assembly, the seat belt buckle assembly is body-mounted to the motor vehicle by the fitting in the installation position of the seat belt force limiter, and the seat belt force limiter is pivoted into the operating position after the mounting of the seat belt buckle assembly.

Abstract: A restraint system for a vehicle, with which in a pre-crash phase prior to a predicted front crash time a vehicle occupant resting on a vehicle seat can be raised from a comfort position to an upright operative position by a forward displacer, in which in a crash phase a seat belt fastened on the vehicle occupant exerts a restraining effect on the vehicle occupant, in which an electromotive reversible belt pretensioner is activated to limit the restraining force exerted on the vehicle occupant to a predefined force level, namely by means of forward displacement of the vehicle occupant along a belt force limiting travel. In accordance with the invention, when raising the vehicle occupant to the operative position in the pre-crash phase, the electromotively reversible belt pretensioner generates a pre-crash belt slack so as to provide the pre-crash belt pullout travel required for raising the vehicle occupant in a restraining-force-free manner.

Abstract: A force limiting device (10) for a seat belt comprises a fitting (14), a tension transfer means (36) and a deformation member (12) directly abutting on the fitting (14), wherein the fitting (14, 114) comprises a deflection unit (20, 120) in the form of a deflection pulley for the tension transfer means (36, 136).

Abstract: An inflatable blanket for a vehicle includes a first blanket layer, a second blanket layer coupled to the first blanket layer, and an airbag disposed between the first blanket layer and the second blanket layer. The airbag has a deflated configuration and an inflated configuration to protect a vehicle occupant when the vehicle is subjected to an external force.

Abstract: A safety belt arrangement for a vehicle, with a belt force limiting unit which is constructed as a piston/cylinder assembly having a piston tube and a piston, which in the event of the belt force being limited is displaceable by a force limiting path in the piston tube, while expanding and plastically deforming the latter, whereby the belt force exerted on a vehicle occupant is limited to a predefined level of force. According to the invention, at least one tube element, which can be pushed telescopically onto the piston tube to form a double tube structure, is provided for setting the force level course over the force limiting path.

Abstract: A tensioner device for a seat belt with a tensioner block (1) cable passageway (2) in which there is formed a pressure chamber (3) and a pull cable (4) that can be connected to a compressed-gas powered piston and that can be connected to a seat belt component for providing a tensioning motion. The pull cable extends through the pressure chamber (3) and with a gas generator (5) that is attached to the tensioner block (1), wherein, when triggered, the gas exiting from the gas generator (5) flows through a feed section (6) of the tensioner block (1) into the pressure chamber (3), wherein a guide element (8) is formed in a transition area (7) of the feed section (6) in the pressure chamber (3) that extends via a bar (11) parallel relative to the pull cable (4) and thereby divides the transition area (7) into at least two openings (9).

Abstract: A vehicle seatbelt device includes: a three-point seatbelt, a tongue having a long hole through which an intermediate portion of the seatbelt is inserted, a buckle that has a buckle main body at which the tongue is anchored and a stay that extends from the buckle main body toward a vehicle lower side and is connected to the vehicle seat, a forward tilting mechanism that tilts the stay toward a seat front side at a time of a vehicle collision or at a time a vehicle collision is predicted, and a shoulder pretensioner that pulls in a shoulder belt of the seatbelt at a time of a vehicle collision, wherein a lower end portion of the buckle main body and an upper end portion of the stay are connected rotatably around an axis along a seat transverse direction.

Abstract: A seatbelt tensioner for a seat belt retractor, having a pipe (1) with a tensioner drive wheel, a gas generator (10), a piston (3), and at least one mass body (4). The mass body (4) is drivable by gas from the gas generator (10) acting on the piston (3) between the gas generator (10) and a mass body (4). The mass body drives the tensioner drive wheel. The pipe (1) has a receiving section (5) with a first inner diameter (2), in which the piston (3) in its initial state is arranged with an initial-state outer diameter (8). The pipe (1) has a guide section (6) which adjoins the receiving section (5) and which has a second inner diameter (7). The second inner diameter (7) is smaller than the first inner diameter (2) and smaller than the initial-state outer diameter (8) of the piston (3).

Abstract: A seat assembly includes a frame and a plurality of support members, each support member having ends spaced along a seat-longitudinal axis and connected to the frame. The seat assembly includes a cross-member fixed relative to the support members. The seat assembly includes a pyrotechnic device designed to move the cross-member and the plurality of support members to a downward position.

Abstract: A vehicular locking device includes a bore having first and second ends. A gas generating device is proximate the first end. A piston is movable along an interior of the bore. The vehicular locking device includes first and second plates. The second plate includes an aperture. Activation of the gas generating device accelerates the piston through the aperture and the second plate preventing displacement of the second plate.

Abstract: An assembly includes a base and a seatbelt anchor. The seatbelt anchor has a first end defining a circular hole pivotally supported by the base and a second end fixed in position relative to the first end. The assembly includes a buckle fixed in position relative to the second end. The assembly includes a pyrotechnic actuator secured to the base. The assembly includes a connector extending from the pyrotechnic actuator to the seatbelt anchor.

Abstract: The invention relates to a belt tensioner (30) for a vehicle occupant restraint system comprising a housing (32), a working chamber (34) into which the compressed gas released in the case of restraint is flowing, a pull rope (24) extending through an opening (36) within the housing (32) and a sealing bush (10) for sealing the working chamber (34) against the opening (36) between the pull rope (24) and the housing (32), with the sealing bush (10) comprising a sleeve (16) and a sealing element (12) and the sealing bush (10) being pressed onto the pull rope (24) by plastic deforming of the outer sleeve (16).

Abstract: A computer that may be programmed to: in response to receiving an indication that a vehicle is approaching a geofence boundary, retract slack in a webbing associated with a seat in the vehicle by actuating a seatbelt retractor; then receive measurement data from one or more sensors associated with the seat; using the data, determine whether an occupant occupies the seat; and when no occupant occupies the seat, then transmit an instruction to stop the vehicle.

Abstract: A restraint system includes a housing defining a cavity tapering to an end and a plug disposed in the cavity. The plug is larger than the end of the housing. A seatbelt buckle is fixed relative to one of the housing and the plug and is moveable from a first position to a second position relative to the other of the housing and the plug. The plug is moveable relative to the housing toward the end during movement from the first position to the second position. One of the housing and the plug is plastically deformable by the other of the housing and the plug during movement from the first position to the second position.

Abstract: An occupant protection apparatus includes: an airbag configured to be stored in a head rest or a seat back of a vehicle seat, and the airbag being formed as a single bag that is configured to cover a head of an occupant and including a front inflating part and a right and left pair of lateral inflating parts; a three-point seat belt device including webbing equipped with a lap belt and a shoulder belt, and a belt take-up mechanism, and the belt take-up mechanism applying tension to the webbing; and a control unit that, in the event that an impact to the vehicle has been predicted or detected, activates the belt take-up mechanism before inflating and deploying the airbag.

Abstract: Provided are a pretensioner, a retractor, and a seat belt device in which strength and slidability of a rod-shaped power transmission member may both be achieved. A pretensioner includes a ring gear on which the spool is rotatably disposed, and power transmission units for transmitting power to the ring gear in an emergency. The power transmission units includes a rod-shaped power transmission member for transmitting power to the ring gear while being plastically deformed, a tip reinforcing member disposed on a tip side of the power transmission member, a pipe for containing the power transmission member, and a gas generator disposed at an end of the pipe. The tip reinforcing member has higher strength than the power transmission member.

Abstract: A child-restraint harness is coupled to a juvenile vehicle seat and arranged to restrain a child seat in the juvenile vehicle seat. The child-restraint harness includes first and second shoulder straps.

Abstract: A restraint system includes a housing and a rotor engaged with the housing. The housing and the rotor define a cavity therebetween. A resilient material is disposed in the cavity. A helical interface is between the housing and the rotor. The rotor is moveable relative to the housing along the helical interface. A seat belt buckle is connected to and moveable relative to one of the housing and the rotor. During a vehicle impact, the seat belt buckle may cause the rotor to move along the helical interface towards the housing. In this situation, the resilient material may be compressed between the rotor and the housing.

Abstract: On a belt tensioner cable guide member (10) comprising a guide duct (42) for a cable of a belt tensioner and comprising a pressure duct (40) for fluid communication between an inflator and a pressure chamber to which a displacement body to be driven and being coupled to the cable is assigned, a first sealing element (44) sealing the guide duct (42) against the cable and especially enclosing the cable in the peripheral direction is provided within the guide duct (42).

Abstract: A pre-tensioner for a safety belt of vehicles is provided. The pre-tensioner for a safety belt of a vehicle that is disposed in a side sill of the vehicle and that operates to pull the safety belt by pushing a piston into a tube by a high pressure gas of a gas generator using explosive power of gunpowder that is configured at one side of a bracket in a state in which the piston is connected to the safety belt through a wire within the tube including: internal and external weldnuts that are fixed to each one side of internal and external side surfaces of the side sill, wherein by penetrating the side sill in a vehicle width direction by forming a screw at an external circumference of both end portions of the tube, the both end portions are engaged with the internal and external weldnuts, respectively.

Abstract: A device for controlling the correct operating state of a restraining harness, intended for a safety seat, including at least one retaining strap that is under tension when the harness is in the state of restraining the occupant, the device being intended to be disposed in a predefined area of the latter, the device including: at least one sensor device including an elongate flexible element that is suitable for being positioned on the strap, and in particular rigidly connected thereto in the predefined area, and that is provided with a measuring system to measure, in the predefined area, at least a level of bending and/or tilting of the strap, a device to collect values linked to the level of bending and/or tilting, and internal or external device configured to analyze the values and of communicating with a receiver for receiving information on the operating state of the retaining harness.

Abstract: Load input to an occupant from a buckle is reduced. A lift-up buckle device includes a buckle that engages with a tongue inserted through webbing worn by an occupant. The lift-up buckle device also includes wires that each include a portion configuring a first fixed portion fixed to the buckle side and another portion configuring a supported portion supported by a wire guide, and that move the buckle due to a distance between the fixed portions and the supported portions being changed. Respective locations between the fixed portions and the supported portions of the wires are displaced in a direction intersecting an engaged direction of the tongue when an external force in a direction of the engaged direction of the tongue has been input to the buckle.

Abstract: A vehicle seating assembly includes a seat having first and second retainers. A seatback includes a lower cross-member extending between the first and second retainers. An aperture is located in the lower cross-member. A single torsion bar extends between the first and second retainers and is operably coupled therewith. The torsion bar includes an intermediate portion having first and second engagement portions, which are insertably engaged with the aperture. First and second linear portions extend between the first retainer and the first engagement portion and the second retainer and the second engagement portion, respectively. First and second distal ends are configured to engage the first and second retainers, respectively, which induces a torsional resistance in the torsion bar when the seatback is displaced from a zero torsion position. The torsion bar is at the zero torsion position when the seatback is displaced rotationally forward from a design position.

Abstract: The invention relates to a pressure unit (64) for pressurizing a belt shaft (12) in a seat belt system comprising a screw (66) for fastening the pressure unit (64) to a frame (18) of the seat belt system, the screw (66) including a screw head (68) and a screw shank (70), wherein the pressure unit (64) comprises a fastening portion (72) having a screw hole (74) for inserting the screw shank (70), wherein radial play is provided between the screw hole (74) and the screw shank (70) and the fastening portion (72) on the screw head side includes mounting arms (76) for axially fixing the screw (66) in a pre-assembly position. Moreover, the invention also comprises an end fitting (11) of a seat belt system comprising such pressure unit (64).

Abstract: Disclosed are a pretensioner and a safety belt assembly including the same. The pretensioner includes an internal cylinder movably installed within an external cylinder with an outer surface thereof in contact with an inner surface of the external cylinder, a piston installed in the internal cylinder, a retracting member configured with one side connected to the piston and the other side configured to extend from the external cylinder and connected to a belt fastening a passenger, a gas generator configured to supply gas to the inside of the external cylinder to move the piston in a direction of pulling the retracting member, and a one-way restriction device configured to allow the piston to move with respect to the internal cylinder when the piston moves in the direction of pulling the retracting member and to restrict the piston to be within the internal cylinder when the piston moves in reverse direction.