A lock for safety belts having a lock housing secured to a surface of a vehicle and an inner housing slideably located in the lock housing and held therein by spring tension. The lock is also provided with a latch tongue, insertable into the inner housing, and with a latch positioned within the inner housing adapted to engage a depression in the latch tongue under spring loading, with the latch tongue insertable into the inner housing, preventing the withdrawal of the latch tongue therefrom. A release key located on the lock housing is operable from the outside thereof; and said lock further comprises a lever pivotable on a pivot comprising part of said lock housing and engaged by said release key. Said lever bearing upon said latch and, upon depression of said release key, disengages the latch from the depression in said latch tongue, and a displacement of said inner housing against the loading of spring means moves the point of engagement of said latch by said lever towards the fixed pivot of said lever on said lock housing.
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