Tongue assembly for use in a seat belt device

A combination of a tongue assembly and a seat belt for use in a seat belt device adapted to engage a buckle, comprising:

• said tongue assembly including:
• a tongue main body having a rear portion, an insertion portion at a side opposite to the rear portion and adapted to engage the buckle, a middle portion between the rear portion and the insertion portion, and upper and lower surfaces,
• a first slit situated in the middle portion of the main body and extending in a direction perpendicular to an inserting direction of the main body relative to the buckle,
• a first wall portion fixed to the main body, said first wall portion projecting upwardly from the upper surface of the main body and extending along the first slit at a side of the rear portion,
• a slider slidably disposed over the middle portion of the main body and having upper and lower sides,
• a second wall portion formed in the upper side of the slider, said second wall portion extending parallel to the first slit at a side of the insertion portion and having a surface opposing to the first wall portion,
• a second slit formed at the lower side of the slider, said second slit extending parallel to the first slit and disposed under the second wall portion so that a rear edge of the second slit at a side of the rear portion of the main body is situated close to the insertion portion of the main body with respect to the surface of the second wall, and
• a third slit formed in the rear portion of the main body and extending parallel to the first slit,
• said seat belt extending between the first and second wall portions, through the first and second slits, under the lower side of the slider and through the third slit so that when a tension is applied from the side of the third slit, the slider is pulled toward the rear portion of the main body to urge the second wall portion of the slider to the first wall portion to thereby strongly hold the seat belt between the first and second wall portions.