171,973. Hanotier, G. Nov. 26, 1920, [Convention date]. Lock mechanism, slider-type; permutation; night-latches; change-key mechanism; keys; keyholes; locks, cases for; sliding bolts.-The part to be locked, such as the main bolt of a lock, is blocked by a member moving at right-angles to the lock casing, which engages a catch upon the bolt unless a number of sliders are properly set by hand or by a key, and a shoulder is provided to return the parts into engagement when the bolt is shot. The catch and return shoulder may be carried by the bolt, or by the casing containing the mechanism when the latter is movable within the main case of the lock. The sliders may be interchangeable, reversible, or adjustable. In one modification, Figs. 1, 2, and 4, the bolt 1, operated by a handle follower 3, is blocked by the engagement of a catch 19 with a locking- member 15, hinged at 16 to the lock casing, unless a number of sliders 11 are arranged by a key to permit the locking-member to enter notches 14 in the sliders, the movement of which presses back a cover 9 against a spring 10. When the bolt is again shot, a bevel 27 on the bolt lifts the member 15 out of the notches 14, thereby permitting the spring 10 to restore the part 9, and with it the sliders, to their original positions. The sliders are formed with arms 11, 12 extending into passages 25, 26 into which the key is inserted in a direction parallel to the face of the door. Spacing- plates 28 may be fitted between the sliders 11. Fig. 8 shows a combined key and permutation lock, in which the key-operated sliders 55 alternate with sliders 63 which have to be set by hand to a special combination. Both sets must be properly arranged before the locking-member 42 passes out of the plane of a stop 46 on the bolt 41, and permits of its operation by the handle through rack-and-pinion gear 78, 79. The key-operated sliders are reversible and interchangeable, and the permutation sliders are adjustable, so as to permit of varied arrangements. Fig. 12 shows a permutation slider 63 formed with a rack 67, any tooth of which is engaged by a pin 66 on a bar 61 according to the desired setting. An external button 54 allows the rod 61, and hence the slider 63, to be moved into the position in which the bar 42 drops into the notch 65 to release the bolt. A spring pawl 69 retains each slider in the position to which it has been set. until, when the bolt is shot, a tappet 85 thereon moves a lever 81 which acts upon the tails 80 of all the pawls and moves them out of engagement with the slides. A spring 52 then moves the slides into a new position. The cover of the lock may be arranged to slide in guides, or be otherwise readily removable to allow the key-operated sliders to be reversed or interchanged, and the permutation sliders to be re-adjusted. Fig. 16 shows a fastening of the night-latch type. which is released from the outside by a key inserted sideways into a slit 100 so as to engage with extensions 105 of sliders 97 and arrange them all so as to permit a nose 109 on a locking-piece 88 to enter notches 104. The nose 110 is thus withdrawn from engagement with an. aperture 112 in the fixed casing 113, and a finger-piece 93 can then be operated to move the whole of the mechanism and carry the bolt with it. From the inside, the bolt can be withdrawn directly by a knob 92, compressing a spring 98 against the casing 96 enclosing the lock mechanism. The cover-plate 113 is hinged at 118, and can be swung back to give access to the mechanism by first completely withdrawing the latch, so as to clear the opening in the endplate 120. This modification may be arranged to operate with a key from each side; or the finger control may be placed alongside the casing enclosing the locking-mechanism, instead of being concentric therewith, as in Fig. 16. A further construction is shown in Figs. 21 and 22. The bolt 135 is moved by a follower 138 on a spindle 136, but is capable of being blocked by a piece 134 coming behind a shoulder 148 on the bolt. The piece 134 can be withdrawn by operating a button 145, upon either side of the door, after inserting the key to arrange the sliders 143, the whole mechanism moving upon the outer casing of the lock. The locking-member 142 normally engages a spring 146, which prevents movement until the sliders are so set by the key that the nose 153 enters the notches therein. The part 142 is then rocked upon its pivot 149, clear of the fixed blocking-spring 146. The whole mechanism is then moved by the button 145, thus releasing the bolt for operation by the handle. The parts are selfrestoring upon release. When the mechanism is drawn completely back, the inner cover 141 can be removed to give access to the interior of the lock. The key, Figs. 6 and 7, has a number of interchangeable pieces 32 enclosed in a sheath 31 and pivoted as a whole upon a pin 37 so as to be readily inserted in the key-aperture parallel to the face of the door. A pin 35 sliding in a slot 34 enables the working parts to be drawn into the cover-part 33. The keyholes, as shown at 100 in Fig. 16, are formed by extended parts of the casing bent at a. right-angle. When a keyhole is formed at both sides of the casing, one may be integral therewith or fixed thereto and the other detachably mounted in a recess so that it can be removed to give access to the sliders when the bolt is withdrawn.