Abstract

A latch housing attachable to a side wall of a vehicle frame holds a vertically movable cradle having a spring mounted sensing roller over which a loop or bight of a shoulder harness belt passes. The cradle is also spring mounted in the latch housing. The bottom portions of the facing walls of the cradle cavity in the housing converge to define a downwardly diminishing chamber into which a latch wedge fixed to the bottom of the cradle is movable by belt motion against the cradle spring force. The harness belt extends from each each end of the bight or loop to the take-up reel fixed to the vehicle and to the conventional lap belt near the lap belt buckle. The harness belt passes between the wedge faces and the adjacent faces of the Latch housing lower slanting walls so that swift momentum forces drive the wedge surfaces into binding contact with the belt runs but slower changes in belt momentum are absorbed by the roller mount springs, which are preferably adjustable.