Patent GB-331559-A (GB)
Title: Improvements relating to the operation of ventilators or windows
IPC: E03D9/04
Filed: 1929-01-07
Abstract: 331,559. Nothaft, A. Jan. 7, 1929. Ventilation apparatus. - The action of opening a ventilating flap or window by means of a pull handle winds the spring of a clock mechanism which acts after a predetermined time to close the flap or window. The rotary flap 2, Fig. 1, is maintained in the closed position by a weight 3 and is adapted to be opened by means of a handle 9 on a slide acting through wires or chains 4, 5 wound on a pair of rollers 7, 8. A rack 13 on the slide 6, Fig. 2, meshes with a gear wheel 14 which is geared with the clock mechanism 17, 18 in such manner as to wind the clock spring when the slide 6 is pulled downwardly. The clock mechanism then acts through gearing 19 - - 21 meshing with a second rack 12 on the slide 6 to return the latter to its normal position and allow the weight-controlled flap 2 or window to close. The flap 2 is held in open position by a pair of spring- controlled pivoted levers 24, 25 which are adapted to engage a member 23 on the wire 5 when the latter is in its lowermost position. A projection 29 on the slide 6 disengages such locking levers when the slide is returned to its upper position, thereby permitting the flap 2 to close. If desired, when the invention is applied to the flaps or windows of lavatories the wire 5 is guided through the bore of the handle 33 of the flushing-mechanism, and, by means of a projection 34, operates such mechanism at the same time as it opens the flap as shown in Fig. 1. In a modification, the wire 5 is coiled on a grooved disc 6. as shown in Figs. 5 and 6, so as to wind the spring of a clock mechanism, the disc 6 being locked in position at the end of the winding movement by a spring-pressed lever 23 engaging a notch 37 of a disc rigid with the disc 6. When the pull-handle is pulled downwardly, the disc 6 is rotated so as to wind the clock mechanism and open the window or flap. During the latter part of the rotary movement of the disc 6 an elbow lever 40, 41 is moved against the action of a spring 42 by means of a pawl 43 engaging a notch 44 on the disc 6. This' oscillation of the lever 40, 41 also allows a sector 47 loosely mounted on the axle 46 of the clock mechanism to fall under the action of a spring 55 so that a pawl 52 on the sector is caused by the striking of a lever 53 against an arm 56, to engage a driven ratchet wheel 51 whereby the sector 47 is returned to its initial position. The elbow lever 40, 41 is then enabled to return under the action of th spring, 42, thereby allowing the locking lever 23 to release the disc 6 and the, window or flap to be automatically closed. When the sector reaches its final position, the lever 53 strikes against a stop 48 on the sector 47, and disengages the pawl 52 from the ratchet wheel 51. If desired, a spring-controlled knob may be pressed to release the lever 23 and permit the flap or window to close. The time of opening of the flap or window may be regulated by altering the angular setting of the stop lever 56. The apparatus may be adapted to control a number of flaps arranged in ventilating pipes leading from a number of lavatories to a common outlet.