the locking member application_number US 5595679 A description referring first to fig1 to 5 showing a first embodiment of the invention a locking device used in the buckle assembly for vehicle seat belt according to the invention is generally designated by 1 the locking device 1 has an lower cover 2 and an upper cover 3 in a somewhat rectangular form when assembled together the two cover members 2 and 3 form a box like case in which there is defined a hollow room or chamber 5 to receive various elements as hereinafter described the cover members have cutouts 7a and 6a provided in the walls 7 and 6 respectively at the foreside left hand side as viewed in fig1 of the covers when the two covers are assembled these cutouts 7a and 6a together form a tongue inserting opening 8 fig4 which is in communication with the above mentioned room 5 two long side walls of the cover 3 are designated by 3a and 3b and two long side walls of the cover 2 are designated by 2a and 2b of which the long side walls 3b and 2b have cutouts 10a and 9a respectively the two mating cutouts 10a and 9a together form an opening 11 fig5 for receiving a push button at the insides.