Patent GB-431118-A (GB)
Title: Improvements in and relating to doors
IPC: E05D15/50
Filed: 1935-01-11
Abstract: 431,118. Hinges. NAAMLOOZE VENNOOTSCHAP MACHINERIEEN - EN APPARATEN FABRIEKEN MEAF, (formerly NAAMLOOZE VENNOOTSCHAP MACHINERIEEN-EN APPARATEN FABRIEKEN), 30, Croeselaan, Utrecht, Holland. Jan. 11, 1935, No. 1053. Convention date, Jan. 12, 1934. [Class 65 (ii)] In a pivot arrangement allowing a door to be opened about either edge and comprising spring-pressed pivot pins at each edge of the door for engagement with sockets in the upper and lower members of the door frame, each pair of pins being retractible by a separate handle on the door, the handles are connected to the pins by means of a rod extending across the door and pivotally connected to the pins at opposite sides of the door, this rod also having longitudinal motion to engage a keeper to lock one or other set of pins; means are also provided to prevent retraction of the pins when the door is open. In the form shown, the pins 3 slide in tubes 2 in the door and are pressed by springs 4 to engage holes 5 in the threshold and lintel ; the pins on the righthand side are shown in the retracted position. Two interlocking bars 7 are provided, projecting through apertures 11 in the tubes 2 and having pin-and-slot connection at both ends with the hinge pins 3 ; these bars are connected by links 10 with cranks 9 operated by the handles, so that movement of either handle draws the adjacent ends of the bars 7 towards one another and retracts the corresponding hinge pins, the apertures 11 allowing for this movement of the bars 7. In order to prevent complete detachment of the door from the frame by operating both handles together, the tubes 2 are formed with apertures 12 opposite the apertures 11 but capable of receiving the bars 7 only in their normal position ; the bars are of such length that one end is always in engagement with one of the apertures 12, and one end of each bar is bevelled at 13, this end being normally held in engagement with the aperture 12 by a spring 20 and the other end of the bar being therefore normally free. When the bars 7 are drawn towards each other by one of the handles, the one having its bevelled end on the side at which the hinge pins are being withdrawn is moved longitudinally, by engagement of the bevel with the edge of the aperture 12, to engage the aperture 12 at the other end, thus locking the hinge pin and handle at that side, (as shown for the upper bar 7), while the other bar cannot be moved by its bevel because its square end is out of line with the aperture 12. To prevent the pins on which the door is swinging from being retracted when the door is opened, a bolt 15 is pressed into a groove in the pin by a spring 17 when the door is open, the bolt being withdrawn when the door is closed by a member 16 engaging the threshold. In an alternative method of locking the hinge pin when the door is open, a member on the door is normally held clear of the pin by engagement with the hinge post of the door frame, but when the door opens this member is pressed by a spring into a groove in the pin. In a further form, a fixed member on the door frame engages a peripheral groove in the pin, and a longitudinal groove in the pin is brought into line with it when the door is closed to allow retraction of the pin. Stops may be provided on the lower edge of the door and the sill plate to limit opening about either axis.