696. Soc. Anon. des Etablissements Bauche. Jan. 9, 1911, [Convention date]. Lock mechanism, change-key; locks, revolving- barrel.-The bolt is operated by pins 77 projecting from a toothed wheel 76, which is in gear with teeth 68 on a rotatable socket 67 mounted in the casing on the inside handle spindle 70. From outside, the socket 67 is actuated by projections 49 on a plunger 50 which is slidably mounted in the revolving barrel 35 and is pushed forward by the key acting on the rod 51 so that the projections 49 enter openings 66 in the socket. The barrel 35 is normally locked against rotation by means of notched bars 63 mounted therein co-operating with a baffle ring 39 screwed to the casing. The bars 63 are carried by spring - controlled sliders 54 which are mounted within recesses 37 in the barrel and have pin extensions 54<a>, on the ends of which the key acts. The bars 63 are held in position on the sliders by means of spring catches 60 pivoted to the bars and adapted to engage one of a series of teeth 58 on the sliders. The combination of the lock can be changed by altering the positions of the bars relatively to the sliders, and this can be done by means of slides 44 mounted one for each bar 63 in recesses in the baffle-ring 39, and each having a tooth 46 adapted, when the slide is moved inwards, to release the corresponding catch 60 from the teeth 58 and, while holding the bar stationary by entering the notch 64, allow the sliders 54 to spring out to their zero positions. When the new key has reset the sliders, the catches 60 are again caused to engage the racks 58 to hold the bars in their new relative positions. The slides 44 in the baffle-ring are operated from inside the door by rotating a ring 40 which has a series of inclined slots engaging pins 45 on the slides 44. When the key is inserted into the lock, it presses back a plug 32 which serves to operate the plunger 50, and can then be held in the lock by a spring catch 28. which is operable by a rotating ring 29, and takes behind a bit 23 on the key. Mechanism is provided to prevent the withdrawal of the bolt from the inside after it has been shot from outside. For this purpose a second socket 71 is mounted on the socket 67 so that it rotates therewith but can slide against the action of a spring 72, and this socket is adapted to be locked against rotation by means of a lever 93, the end 97 of which takes into a notch 98 in the rim of the socket 71. When the key is used from outside, the socket 71 is pressed back by the projections 49 sufficiently far to clear the lever 93 and enable the parts to rotate to operate the bolt, but locking the socket 71 prevents the operation of the socket 67 from the inside, a plate 100 projecting from the bolt engaging the end of the lever 93 when the bolt is shot and preventing the disengagement of this until the bolt is withdrawn by the key. In a modified form, each bar 63 carries a second bar adjustably mounted thereon and with a notch to correspond with the notch 64 of the bar 63 so that, in unlocking, the key has first to be set to bring these notches into position and to turn the barrel partly round, and then again set for the notches 64 to complete the revolution of the barrel. Keys.-The key comprises a barrel 1, Fig. 3, within slots 2 in which are slidably mounted tubes 3 which can be set into various positions to operate the pins 54 of the lock bars. The tubes are set into position by rods 8 the ends 9 of which engage in bayonet slots 10 in the tubes and which after the setting are drawn into the barrel by springs 13, and the tubes are held in their adjusted positions by spring pawls 5 engaging racks 4 on the tubes and held against disengagement by a notched ring 15, Fig. 4. The barrel 1 is surrounded by a cylindrical casing 20, and a cap piece 21 having apertures 22 for the reception of the pins 54 when the key is inserted into the lock, and a bit 23 for coacting with the spring catch 28.