Abstract: An object of the invention is to provide at low manufacturing cost a clamp-operated retractor including an emergency locking mechanism adapted to lock the rotation of the winding shaft in the webbing pull-out direction in an emergency such as a collision, in which a webbing clamping mechanism is simple in structure, and is able to quickly stop the webbing from being pulled out.

Abstract: An automatic take-up apparatus is used with the seat belt device of a vehicle and can cause a lock member to be engaged with a latch plate rotatable with a webbing take-up shaft to thereby automatically lock the draw-out of webbing. The lock member has its operation controlled by a control member mounted radially outwardly of the latch plate and brought into resilient contact with the latch plate, and is kept in a non-locking position during the draw-out of the webbing and is permitted to move to a locking position when some rewinding of the webbing has been sensed, thereby automatically blocking the draw-out of the webbing after mounted.

Abstract: An emergency locking retractor comprises a lock member capable of assuming a position in which it engages an engaging portion integral with a webbing take-up shaft to lock the rotation of the shaft in webbing draw-out direction and a position in which it does not engage the engaging portion. A speed change sensing member is adapted, when it senses a greater speed change of a vehicle than a predetermined value, to shift from a first condition to a second condition and thereby move the lock member to the engaging position. The retractor also includes a switch-actuated electrical system for moving the lock member independently of the sensing member.

Abstract: A safety seat belt retractor provided with an inertia sensing member capable of sensing a predetermined speed variation or tilting of a vehicle body and assuming a first position of normal state and a second position corresponding to said predetermined speed variation or tilting, the inertia sensing member being continuously displaceable from said first position to said second position to, and lock means for preventing draw-out of webbing to restrain a seat occupant when said inertia sensing member is displaced to said second position. The inertia sensing member is designed to be brought to said second position by the attraction of a magnet when said inertia sensing member has been displaced by a predetermined amount from said first position.