that if the sliding members are pried apart the flexible shafts deform and the projections remain engaged and prevent unauthorized opening of the sliding article application_number US 82136504 A description 0044 fig1 shows a catch 1 which is attached to a first member 3 and a second member 5 the second member 5 is slidable in a first sliding direction 7 relative to the first member 3 the catch 1 has a first catch member 9 and a second catch member 11 the first catch member 9 has an l shaped shaft 13 which is integral with the first sliding member 3 at one end 15 located at the other end or free end of shaft 13 is a first projection 17 which is also integral with shaft 13 similarly second catch member 11 comprises an l shaped shaft 19 and a second projection 21 the second catch member 11 is similar in construction to the first catch member 9 but is rotated through 180 degrees to the first catch member 9 the distance d between the first member 3 and the second member 5 is such that the second member 5 can freely slide in the first sliding direction 7 relative to the first member in fig1 the catch is shown in the unlocked position i e the projections 17 21 are not inter engaged with each other the catch may be moved into the locked position by a lock member 4 in this particular example lock member 4 acts to pull.