Insassen-Schutzvorrichtung für ein Kraftfahrzeug

摘要

An actuator (32) of an active knee bolster (24) is provided with a drive force generation device (38) and a one way lock mechanism (40) that is disposed in the vicinity of an operation end of the drive force generation device (38). The one way lock mechanism (40) is configured such that, if attempted movement of a piston member (42) in an inward insertion direction occurs, respective engagement portions (64) are moved to a taper portion (62B) by urging force of a spring (66), whereby the engagement portions (64) are abutted against an external periphery surface of the piston member (42) such that the piston member (42) and the engagement portions (64) are fixed. Accordingly, as a result of the one way lock mechanism (40), a main body (30) of the active knee bolster (24) that has been moved to a restraining position cannot return in a vehicle forward direction, and thus it is possible to generate a substantial restraining force that restrains a lower limb (28A) of an occupant (28).