| 摘要 |
A safety belt buckle for insertion of a male lug designed to resist the action of a belt pretensioner, comprises a load bearing frame with a catch bolt slidingly mounted thereon and adapted to be moved between an unlocked and a locking position in which it engages the inserted male lug, a release button adapted to be operated to slide the catch bolt into its unlocked position for release of the male lug, a multiple-arm locking lever for preventing unintentional displacement of the release button, a pivot axis for the locking lever, and an inertial mass body movably mounted on the locking lever. The locking lever has a first and a second arm and being mounted on the frame for pivoting about the pivot axis. The first arm of the locking lever is pivotally coupled to the release button. Abrupt changes in velocity of the buckle in two opposite directions, appear during the belt pretensioning. The inertial mass body is so mounted in a moving manner on the second arm for transmission of its inertial force upon an abrupt change in velocity of the buckle during belt pretensioning, that during the abrupt change in velocity of the buckle in one direction the inertial mass body transmits an inertial force to the second arm and that the inertial mass body is movable with respect to the lever arm upon abrupt change of velocity in the opposite direction to interrupt the transmission of force from the inertial mass body to the lever arm. The inertial forces acting on the locking lever from the outside together with its inherent moment of inertia producing a sum moment of inertia about its pivot axis, which moment prevents an unintentional sliding of the release button during an abrupt change in velocity of the buckle during belt pretensioning. |
