Abstract: A door checker which can be advantageously utilized for driving automotive equipment such as a seat belt reacher system in synchronization with the opening and closing action of the vehicle door. By appropriate arrangement of a spring and a taper in the door checker member, the force required to open and close the door is not unduly increased. By proper arrangement of the spring, the side thrust from the door checker member is always directed in one direction, whereby the structure for supporting the side thrust is simplified.

Abstract: A seat belt tightening device for removing slack in a seat belt when the seat belt is required to positively restrain a passenger, comprising clamp members for clamping a part of the seat belt paid out from a retractor device; a winding member for winding thereonto a portion of the seat belt that is located ahead of the part clamped by the clamp means by a rotary motion; and a drive source for causing a rotational motion of the winding member. The winding member may be either integral with one of the clamp members or separate from both of them.

Abstract: Disclosed is a seat belt forwarding system having a rotary arm carrying an end of a seat belt at its free end. The rotary arm is driven by a tension cable by way of a rotary unit having three transmitting members which are coaxially arranged and supported in a freely rotatable manner. By advantageous arrangement of the transmitting members, even when motion of the rotary arm is obstructed, spring means advantageously absorb the resultant force and no excessive force will be produced in the rotary unit. The first spring means biases the second transmitting member in a rearward direction while the second spring means is engaged between the second and the third transmitting members. The transmitting of force between the transmitting members is achieved by projections provided in the opposing surfaces of the transmitting members, in addition to the transmission of force between the second and the third transmitting members by the second spring means.

Abstract: A process for polymerizing an olefin comprises effecting said polymerization in contact with a catalyst of a combination of a first solid component prepared by treating a mixture of (a) a titanium tetrahalide, (b) a vanadyl alcoholate and (c) a vanadyl trihalide, with an organoaluminum compound, and a second component of an organoaluminum compound.