Abstract: A wheel blocking device includes a pressure foot which is attached to one end of a pressure foot arm. The other end of the pressure foot arm is pivotally connected to either the frame or an axle of the vehicle. One end of an actuator is connected to the pressure foot arm and the other end is connected to either the frame or an axle of the vehicle. When the actuator actuates, the pressure foot is forced into engagement with a tire of the vehicle. The pressure foot indents the tire to a predetermined degree, thereby providing a positive mechanical lock to prevent rotation of the tire. A control system allows the vehicle's driver to actuate the wheel blocking device while seated in the vehicle's cab.

Abstract: An emergency brake system for wheeled vehicles includes a deformable brake wedge for each tire on one of the vehicle's axles. The brake wedges are constructed and arranged to transfer substantially all braking forces to the vehicle through the vehicle's tires. The system also includes releasable mechanism for allowing the brake wedges to move between inoperative and operative positions and an electrically-controlled pin for retaining the brake wedges in those positions.

Abstract: An emergency brake system for wheeled vehicles includes a deformable brake wedge for each tire on one of the vehicle's axles. The brake wedges are constructed and arranged to transfer substantially all braking forces to the vehicle through the vehicle's tires during emergency braking. The system also includes releasable device for allowing the brake wedges to move between inoperative and operative positions and electrically-controlled device for retaining the brake wedges in those positions. While the brake wedges move from the inoperative position to the operative position, a control system temporarily applies the vehicle brakes associated with the tires that engage the brake wedges during emergency braking.