Patent GB-200245-A (GB)
Title: Improved device for fastening doors, windows and the like
IPC: E05B65/08
Filed: 1922-04-21
Abstract: 200,245. Glover, W. S. C. April 21, 1922. Latches, lift and thumb; latches, swinging. - The latch member of a fastening for doors, windows &c. is mounted in a floating condition so that after its hooked end has dropped behind the incline on the striking-plate it can be moved longitudinally to tighten it by a cam, eccentric &c. actuated by a handle or lever. The hooked end a of the spring- controlled latch A, Fig. 1, after riding up and dropping behind the inclined face e<1> of the striking-plate E, Fig. 5, is tightened against the edge e<2> by rotation of the cam D by the spindle d<1> or pivoted lever c, the cam D acting on a spring-controlled member G fulcrummed at .g in the latch A to force the latch backwards and compress the spring g<1>. A reverse rotation of the cam D first releases pressure on the spring g<1> and then the cam, acting on the face b<1> of the latch, moves the latter forward and subsequently rotates it to lift its hooked end a clear of the striking- plate F as shown in Fig. 3. The cam D is connected to the lever C by a pin d' on the projection d<2> engaging the slot c in the lever C, which is held in the vertical plane by a T-headed pin b<1> on the casing B engaging in a slot c<2> in the lever. A pin a<1> on the latch A working in a right-angled slot c<1> in the lever C prevents the lever from being moved to tighten the latch before the latter has dropped behind the inclined face e<1> of the striking-plate. To lock the latch A in its tightened position, a leaf-spring h, Fig. 9, mounted in a recess in the cam D and in the square operating spindle H is moved by rotation of a tube J with cam surface j to engage a pin h<2> with a hole h<3> in the latch. In a modification, the latch A may be of the form shown in Fig. 8, a two-armed spring g<2> replacing the members G and spring g'. In a further modification, Fig. 12, the latch A is made up of two plates connected by pins a<8>, a<9> and having a recess between the plates at the end a<2> in which works a spring K mounted at c<4> on the pivoted lever C. A pin b<6> on the casing B engages in a slot a<6> in the latch and a spring L anchored on a stud a' on the latch engages with a pin b<7> on the casing, about the pin b<6>. The latch A, Fig. 12, is moved in certain positions of the latch, to rock the latter rearwardly to tighten against the edge e<2> of the striking-plate by pressing the lever C forwards thus forcing the arms k, k' of the spring K downwards between the pin b<5> on the casing and pin a<4> on the latch. A reverse movement of the lever C moves the spring K upwardly, causing its arm k to slide at its upper end on the projection b<8> on the casing and also to contact with the pin a<5> on the latch so as to move the latter forward into Fig. 12 position. Continued movement of the lever C into the Fig. 14 position causes the arm k to clear, and move vertically past, the projection b<8> whilst it continues to act on the pin a<5> so that the latch A, not being able to move forward, is rotated about the pin b<6>, against the action of the spring L, to lift its hooked end a clear of the striking-plate E. A shoulder a<10> on the latch prevents the lever C 'being moved to tighten the latch before the latter has dropped behind the inclined face of the striking-plate.