Abstract: An actuator is adapted to selectively extend and retract a bumper member, the actuator is mounted at least partially within a tubular frame rail member of the motor vehicle. The main frame rail member may be of a standard length or of a shortened length. By mounting the actuator inside the tubular frame rail member, the bending stiffness is more effectively impacted by the outer tube of the actuator. An additional tubular frame rail member is optionally attached to the main tubular frame rail member. The actuator is mounted at least partially within the tubular frame rail member and at least partially within the additional tubular frame rail member. The wall thickness and cross-sectional shape of the additional tubular frame rail members may be adjusted to obtain a desired bending stiffness including the effect of the outer tube of the actuator.

Abstract: An actuator is adapted to selectively extend and retract a bumper member, the actuator is mounted at least partially within a tubular frame rail member of the motor vehicle. The main frame rail member may be of a standard length or of a shortened length. By mounting the actuator inside the tubular frame rail member, the bending stiffness is more effectively impacted by the outer tube of the actuator. An additional tubular frame rail member is optionally attached to the main tubular frame rail member. The actuator is mounted at least partially within the tubular frame rail member and at least partially within the additional tubular frame rail member. The wall thickness and cross-sectional shape of the additional tubular frame rail members may be adjusted to obtain a desired bending stiffness including the effect of the outer tube of the actuator.

Abstract: A pre-impact mode of a bumper system is provided by extending a bumper member outwardly and extending a stiffener member downwardly. Both the bumper member and the stiffener member are separately adapted to engage an object. The bumper system includes a bumper member movable between a retracted position and a laterally extended position. A stiffener member is movable between a retracted position and a downwardly extended position. An actuator mechanism is adapted to move the bumper member between the retracted and laterally extended positions and to cause the stiffener member to move between the retracted and downwardly extended positions as a result of moving the bumper member.

Abstract: If an impact occurs with an impact energy which exceeds an elastic limit of a bumper while a shock-absorbing member is in a projected position, a bumper stay is forced to move rearward along a first actuating chamber to cause the shock-absorbing member to pivot to a received position. The impact energy is primarily absorbed by an elastic force of a first spring which biases the shock-absorbing member toward the projected position. When the impact energy is not thoroughly absorbed by the first spring, the shock-absorbing member fully pivots into its received position by the bumper stay which is continuously moved rearward. At this time, a second spring which biases the shock-absorbing member forward and is prevented from being stretched forward by the shock-absorbing member, is contacted with the bumper stay via a support plate.