GB494062A - Improvements in or relating to locking devices for elevator doors - Google Patents

Abstract

494,062. Locking lift gates. MAHLKE, W. Dec. 29, 1937, No. 35954. Convention date, June 12. [Class 78 (iii)] In well-door locking-appliances, the turning of the knob on the lock to withdraw the bolt, is only effective when the cage is standing at the floor, while silent working is ensured by arranging that the cage remains clear of the locking-appliances when passing floors at which it is not desired to stop. A two-dimension break of the operating circuit for the winding- gear also is made by the unlocking and the opening of the door. The contact roller o, Figs. 3 and 8, which normally hangs clear of the contact bars l on the cage, is carried by an arm h pivoted to the locking-bar r at m. Rotation of the member a by the attendant from the inside, or by an intending passenger from the outside, moves a member d axially to operate a bar s to swing the lever h. This has'no effect on the lock unless the cage is standing at the floor, in which case the roller o abuts against the bar l and forms a fulcrum about which the lever then moves to withdraw the locking-bar r from its socket to unlock the door. The bar has an upstanding contactcarrying arm at one end so that its movement causes the sets of contacts i to be displaced laterally to break the winding circuit. The unlocked door is then opened, which movement causes a slider g to be depressed by a cam groove on the housing carrying the bolt socket. This gives the displaced contacts i a further displacement in a vertical direction to allow of which they are mounted slidably on the arm carried by the bar. Contact is re-established in the same sequence as the door is re-closed and locked. The slider g in its lowered position also moves in front of the retracted bar r and retains it in the unlocked position. On closing the door the member g is raised to unlock the bar, and the spring f first swings the lever h counterclockwise and thus slides the bar r inwards to lock the door and then swings it clockwise to restore the members s and d to their original positions.