IE41430L - Ventilators - Google Patents

Abstract

1510786 Operating window ventilators J H BIERLICH 18 July 1975 [19 July 1974] 32166/74 Heading E2M [Also in Division F4] A ventilator for mounting between the upper edge of glazing 1 and the upper bar 2 of a window sash comprises bars 4, 5 spaced apart and connected together by spacers 6 to define a ventilation passage, and flaps 19, 20 pivotally mounted on bars 4, 5 respectively at opposite ends of the ventilation passage, and coupled for simultaneous operation, wherein the flaps 19, 20 can be pivoted from positions in which both ends of the passage are closed to positions in which both ends are open. In the form shown, the flaps are coupled together by links 17, 18 connected to one or more crank wheels 16 coupled by a spiral spring 28 to a shaft 14 which is rotatably mounted in the spacers 6, so that the flaps are biased to their closed positions. The spacers 6 are cast or cut from a length of extruded aluminium or nylon. The bars 4, 5 and flaps 19, 20 are cut from lengths of extruded aluminium or plastics material. Alternatively each bar may comprise metal sections separated by a plastics thermally insulating material. During assembly of the venilator, the spacers 6 are slid into engagement with dovetail joints 9, 10 on bars 4, 5 and the flaps 19, 20 are slid lengthwise into engagement with recesses 23, 24 on the bars. Each flap may include an integral rib 30 to act as a handle on flap 19 and a drip strip on flap 20. A radial flow fan (35, Fig. 3) freely rotatable on the shaft 14 ensure that outgoing air is replaced by fresh in-coming air. A gauze insect screen (34) may be provided. [GB1510786A]