Locking plate for letter box flaps has Z-shaped cross-section and is mounted with its upper and lower arms vertical, one arm being bolted to box by bolts passed through name plate aperture, so that other arm locks flap

摘要

The locking plate (1) for letter box flaps (13) has a Z-shaped cross-section. It is mounted with its upper and lower arms vertical. One arm is bolted to the box by bolts (4) passed through the name plate aperture (6), so that the other arm locks the flap.