Patent GB-501613-A (GB)
Title: Improvements relating to door control mechanism
IPC: E05B65/32
Filed: 1937-09-27
Abstract: 501,613. Door latches; door-operating appliances; stops. SCHONITZER, R. I. Sept. 27, 1937, No. 26097. [Classes 44 and 65 (i)] [Also in Group XIV] A mechanism, for latching and initiating the opening of a door, of the kind comprising a pivoted member which is mounted on the door to co-operate with means on the door post and which is automatically movable between an operative and an operated position by manual release of a detent, has the pivoted member oscillatable in a plane parallel to the door edge. The pivoted member 12 is mounted on a shaft 31 on the other end of which is an element 35, and is urged in clockwise direction by a spring 40 acting on this element. The member 12 is held in the operative position shown, Fig. 8, by means of a detent 54 having a shoulder 56 which engages a shoulder 57 of the element 35. The shoulders 56 and 57 are designed as arcs or chords of a circle the centre of which is the pivot pin 55 so as to minimize the force required to rotate the detent 54. The element 35 can be released by operation of the outside push-button 60 acting directly on the detent 54 or by the inside push-button 74 acting through the members 87, 93, 75, 79, 80, 82. To facilitate dismantling, there is no fixed connection between the rod 75, the rod finger 79. and the member 80. On release, the pivoted member 12 rotates under the action of the spring 40 until the tip 43 of the element 35 abuts against the metal capped rubber stop 46. This movement of the member 12 is sufficient to cause the arm 11 acting on the keeper pin 18, to push the door ajar so that it may be fully opened by means of either. of the handles 128, 129, Fig. 4. If the door is now closed, the pin 18 acting on the arm 11 rotates the member 12 and the element 35 in a counterclockwise direction until the initial position is reached where it will be retained by the detent 54 which is caused to rotate back to its initial position either by gravity or by a spring 58. The arm 10 of the member 12 holds the door latched. Rubber buffers 124, Fig. 3, attached to the door frame 16 prevent strain on the mechanism during this closing movement. The member 54 and the element 35 are pivoted adjacent the plate 34, which has ribs 36 and humps 37 to reduce friction and to facilitate lubrication of the rubbing surfaces. A plate 98 having a tip 100, Figs. 5 and 8, which jambs between the leg. 59 of the detent member 54 and the latch plate side 47, may be used to prevent operation of the detent. This plate is attached to an operating arm 102 by a sliding plate 103 mounted in guides 107, 109 and retained therein by a spring 112. A spring 114 cooperating with notches 115, 116 holds the arm 102 in the extreme positions. The keeper pin 18 is attached to the door frame 16 by screws 26 which enter tapped holes in a triangular plate 27 held in a cage 28 welded or otherwise attached to the inside of the wall 23 of the frame 16. Fibrous insulating washers 30 may be used. The outside push button 60a may be locked against actuation by a pin-tumbler lock 130, Fig. 25, which controls a slidable dog 133 movable into a position behind the button. The push-button and the lock may be clamped to the outer wall 61a of the door by an unthreaded clamping ring 64a held against the outer wall by a wedge member 132. In a modification, the member 12 is mounted inside the edge wall 20 of the door which is then provided with a slot for the reception of the pin 18. This construction is further modified by making the member 12 and the element 35 in one piece. Another modification is also described in which a sliding instead of a pivoted detent is used. Two alternative means used to prevent movement of the detent 54 are also described together with an alternative way of spring loading the member 35. A further construction in which the push-button 74 is placed above the rod 75 is given. The position of the mechanism relative to the door structure may be reversed if desired, i.e. the pivoted member may be attached to the frame 16 and the pin 18 to the door 14. If the mechanism is used as a latch only, the spring 40 is made weaker, and if used as a door throwout mechanism only the arm 10 is removed.