Patent GB-191117742-A (GB)
Title: Improvements in and relating to Draught Excluding Doors.
Inventor: CROISSETTE ALBERT DAVID LE
IPC: E06B3/90
Filed: 1911-08-04
Granted: 1912-08-06
Abstract: 17,742. Le Croissette, A. D. Aug. 4. [Cognate Application, 29,105/11.] Operating doors by springs, lever mechanism, and movement of interconnected doors.- Draught - excluding doors comprise a pair of overlapping hinged or pivoted wings combined with one or more subsidiary pairs of wings connected with the first pair in such a manner that, when the first pair is opened, a subsidiary pair takes up an overlapping position across the doorway. In the arrangement shown in Figs. 1 and 5, the door consists of three pairs of wings 2, 3, 4 hinged to a spindle 1, one of each pair of wings being provided with a pin or roller 8, which engages an angular slot 9 on the opposite wing when the pair of wings are drawn together. The subsidiary wings 3, 4 abut against members 5 projecting from the central wings 2 so that pressure on the central wings from either direction draws into the central position a subsidiary pair of wings. The wings are returned into the position shown in Fig. 1 by springs 7 attached to pins 6 on the wings 3, 4, which springs also retain the wings in the completely folded position shown in Fig. 4. The member 8 may consist of a roller mounted on a member 10 sliding in a slot 11 on the door under the action of a spring 12; and stops 56 on the wings 3, 4 engage recesses 57 in the central wings 1. In a modification, a roller mounted on a spring - controlled lever is substituted for the roller 8. In the arrangement shown in Fig. 10, pairs of wings 23, 24 at right-angles on vertical axes are linked together by the engagement of a pin or roller 26 on an arm 25 carried by one axis with a suitablyshaped groove 27 in a quadrant 28 on the other axis, a spring 31 returning the door to its original position. The pin 26 is guided past the bend in the groove 27 by the pin 29 on the arm 25 engaging with one of the members 30. The wings 23 may be connected to the wings 24 so as to yield and fold flat against the wings 24 in case of panic. In the modification shown in Fig. 14, one of each pair of wings is suitably curved, and the wings are connected together by a link 37 connecting arms on the axes of the wings. Instead of mounting the pairs of wings on common axes as shown in Figs. 10 and 14, they may be mounted at right-angles to each other on axes spaced apart in a corridor and connected by links so that when one pair of doors is open, the other pair is closed. The central pairs of wings may be held in the normal position by a pair of yielding spring stops. Figs. 16 and 19 show a modification comprising two sets of rotating overlapping wings. When the pair of wings 54 is pushed in the direction of the arrow, the left-hand wing 55 passes under the left-hand trip-member 53 carried by the upper spring-controlled bar 51 before the righthand wing 54 engages the trip-member 53 at the other end of the same bar 51, so that the right-hand wing 54, by means of the bar 51, draws around the left-hand wing 55 in front of the corresponding wing on the right-hand side. When the right-hand trip-member 53 comes to the end of the slot 65, it is tripped up, so that the door wing, with which it is engaged, is released. When the doors are rotated in the opposite direction, the lower bar 51 comes into action.