DOOR CATCH Russian patent published in 1995 - IPC

FIELD: catching units. SUBSTANCE: door catch has case 1, cap 2, spring-loaded cross-bar 3 with two protrusions 4, control cam 5 with restrictor 6 and pusher 7, internal and external handles 9 and 8 with plates 10 and 11 and rectangular cross-section rod 12 passing through the plates. Internal handle 9 is spring-loaded by spring 13 relatively plate 11 and provided with gadget for additional catching which has rod 14 mounted onto hub of internal plate 11 in perpendicular to its axis. Rod 14 enters profiled groove onto hub of plate 11. The groove is made in form of radial groove 15 and axial groove 16 which communicates with groove 15. Axial groove 16 has profiled walls 17 and recesses 18 made on it for rod 14. The latter restricts revolution of handle provided with rod 12. Through hole 20 may be made along axis of the hub for moving rod 12 due to external influence at alarm conditions; hole 20 is made in external handle 8. Door catch may be made with rod 12 which is connected with one its end with internal handle 9. Bore is made for other end in square hole of the hub of external handle. The bore provides free motion of handle at additional catching of catch. EFFECT: improved safety. 3 dwg