Patent ID: 6841741

Claim:
A seat weight measuring apparatus for measuring a seat weight including the weight of a passenger sitting on a vehicle seat comprising: a base frame fixed to a vehicle floor; front and rear rail brackets which are located near front and rear ends of the base frame, respectively, and are connected to a seat rail which is slidable in the frontward and rearward directions of the vehicle; a sensor portion which is mounted on the base frame for detecting the load applied from the rail brackets to the base frame; wherein the sensor portion includes a distortion sensor fixed at the middle in the longitudinal direction of the base frame and arms which are disposed at a front portion and a rear portion of the base frame, respectively, to extend in the longitudinal direction, each arm having at its one end a press portion for transmitting force to the distortion sensor and at its other end a connecting portion relative to the rail bracket; wherein protective mechanisms are disposed around the front and rear rail brackets so that when the load applied on the rail brackets and the base frame exceeds a predetermined value, the protective mechanisms transmit the excessive load between the rail brackets and the base frame or the vehicle floor directly and not through the arms; and wherein the protective mechanism at the rear side is provided with a reinforcing member for providing reinforcement against the load in a direction in which the rail brackets are lifted upward.