Method of securing a shoot bolt to a gearbox, and a gearbox therefor

摘要

The invention is embodied by a cremone gearbox which drives two shoot bolts 32 (only one shown) to lock an openable panel such as a window or door. The gearbox has a part such as rack 24 with serrations 28 that can be engaged with complementary serrations 30 on the shoot bolt and also carries a sliding member 40 that can be moved by actuation of the gearbox to secure the cooperating parts together. On assembly of the lock actuation of handle 12 (Fig 1) causes bolt 60 to project from and then move longitudinally relative to the gearbox and thereby push sliding member 40 into its operative position as shown in Fig 4. Projection 56 (Figs 5, 7) can be provided on the sliding member which locates in indentation 52 in the inoperative position and indentation 54 in the operative position.