Patent GB-187936-A (GB)
Title: Improvements in latches
IPC: E05B65/22
Filed: 1921-12-23
Abstract: 187,936. Ottinger, L. Oct. 24, 1921, [Convention date]. Latches, sliding; preventing operation of. - Latch fastenings, particularly adapted for automobila doors, are designed so that the occupant of a car can lock the latches of all doors except one from the interior and then after leaving the car lock the remaining door from the exterior by key-operated means. A spring-pressed latch 11, Fig. 1, is operated from the exterior by a follower 14 acting on an arm 12 and from the inside by a curved lever 16 acting on a lug 17. Pivoted to the follower 14 is a spring-controlled bar 18, the other end of which is movable in an opening in a lug 19 on the casting 12. A stud 25 on the base-plate 10 slides in a slot 23, with notches 24 at each end, in the lever 16 to allow vertical movement of the lever, the stud 25 being retained in the upper notch 24 when the lever is in its normal position by the spring-pressed pin 31. Fixed in a lug on the lever 16 is a transverse pin 28 one end of which is normally movable in a slot 29 in the base-plate 10. On pulling the lever 16 upwardly, however, this end of the pin 28 will move into the extension 30 of the slot 29 so as to prevent operation of the lever 16, whilst the other end of the pin 28 blocks the rod 18 against movement and thereby prevents actuation of the latch by the outside handle. When in its raised position the visible upper part of the lever is inclined to the vertical. In a modification, Fig. 3, one end of a spring-controlled, two-armed pivoted lever 34 normally engages in a notch 33 in the lever 16<1> so that when the lever 16' is raised the other end of the lever 34 blocks the movement of the follower 14. In a further modification, Fig. 4, a pin 50 on the lever 16<c> is adapted when the lever is raised to come against the wall 49 of the specially shaped slot 47 in the latch 11 so as to prevent operation of the latch either by the exterior handle or bv the lever. The inside handle may be of the type shown in Fig. 9, in which a rotatable vertical rod 67 is provided with a cam 68 which engages a lug 69 on the latch. A sleeve 71 having a bayonet-slot connection with the rod 67 has a projection 72, which, when engaged in a recess 73 in the rod 18', prevents the operation of both the inside and outside handles. The projection 72 is released by raising the sleeve 71 and turning it so that its pin 74 lies in the horizontal portion of the slot 75. In a modification, the sleeve 71 is dispensed with and the rod 67 itself is raised by a wedge member sliding on the.window sill so that a projection on the rod blocks the movement of the rod 18', the cam 68 at the same time moving into a recess in the casting 12 so as to prevent rotation of the rod 67. The key-operated means for moving the inside handle from outside the door comprises a plate 99, Fig. 11, pivoted at 100 and having an arcuate groove 101 in which a stud 102 on the lever 16 engages. The plate 99 is operated to move the lever 16 upwards or downwards by a cylnder lock 104, an arm 105 on the inner end of the cylinder being connected by a rod 106 to an arm 103 on the plate 99. The Specification as open to inspection under Sect. 91 (3) (a) comprises also the modification, Fig. 14 (Cancelled), in which the lever 16d in returning to its normal position after retracting the latch is raised automatically into the locking position by causing one end of the pin 28<1> to move in the slot 29<1> of the shape shown. A modified method of mounting the lever 16 against accidental movement is shown in Fig. 2<a> (Cancelled), in which a plate 40, having one end fixed to the stud 25<1> is provided with a resilient arm 42 acted on by the pin 31 and having a lug 43 adapted to engage in one or other of the notches 44 in the lever. In a further modification, Fig. 9 (Cancelled), the outside and inside followers 14<1>, 54 act on a spring-pressed carriage 56 loosely embracing the follower 54. A spring 59 on the spindle 53 normally holds the follower 54 in a recess 61 in the base-plate so that operation of the latch from the outside is prevented until the inside handle 52 is pressed in to free the follower 54. This subject-matter does not appear in the Specification as accepted.