Abstract: A seat belt buckle (100) comprising: a frame (102) having a tongue receiving opening (170) to receive a tongue (173) as the tongue is moved in a first direction, a latch member (180) arranged to move from a latched position to an unlatched position, an ejector to eject the tongue which the latch member is in its unlatched position, an electronic sensor assembly (400) located upon the frame (102) comprising a magnetic sensor and a spaced magnet, a metal bar (260) supported on one of the latch member (180), the ejector (131) or a pivot member (500) and movable into position between the sensor and the magnet.

Abstract: A seat belt buckle (100) operable with a pretensioner (330) connected thereto for moving the buckle a determinable distance to remove slack of the seat belt about an occupant, the buckle comprising: a frame (102), adapted to be connected to the pretensioner (330), defining a tongue receiving opening (170) to receive a tongue (173) as the tongue is moved in a first direction, the frame having a first opening (126a) therein, and opposing frame sides (108a,b), each side including a latch plate slot (110) arranged generally perpendicular to the first direction and an arcuate slot (112), the arcuate slot (112) including a first portion (112a) generally parallel to the latch plate slots (110) and a second portion (113b) angled thereto, a latch plate (180), having end portions (186) movable within the latch plate slots between a locked position in engagement with an opening within the tongue and with the first opening (136a), a weight assembly pivotally connected to the end portions of the latch plate to generate a