GB813062A - Ventilating fan - Google Patents

Abstract

813,062. Axial-flow fans. BYRN, G. F., [trading as BYRN CO., G.]. July 12, 1957 [July 13,1956], No. 21788/56. Class 110 (1). [Also in Group X] In a ventilating fan for mounting in an opening in a window or panel, the glass or panel is clamped between an outer element and an intermediate ring which are secured together by three or more screws passing through the opening, and an inner element detachably connected to the intermediate ring comprises a hollow rim supporting a central boss, an electric driving motor being supported by and partially within the boss, and an adjustable iris diaphragm is disposed between the inner element and the intermediate ring and arranged so that it closely surrounds the boss when closed. The fan shown in Fig. 2 comprises an outer element 10 including horizontal louvres 11 and an annular rim which is connected by screws 15 to an intermediate ring 13 so as to clamp the fan to a window glass 12 around a circular opening in the glass, a rubber ring 14 being interposed. An innner element 16 is detachably connected to the ring 13 by three screws 32, Fig. 3, each of which is threaded into a corresponding member 30 which is pivoted at one end to the ring 13 on a tangential axis. Preferably, the members 30 are spring- loaded so that they spring outwardly on removal of the screws 32. A central boss 19 and concentric baffle rings 18 are supported from the rim of the inner element 16 by a single hollow strut 17 through which pass the supply leads of an electric motor 20. The motor 20 is flexibly mounted within the boss 19 on three or more rubber blocks 34. The impeller hub 37 is shaped to form a continuation of the boss 19, the latter having a detachable cover 45. Switch 42, which preferably provides two speeds, is operated by a pull cord 43. An iris diaphragm comprises leaves (not shown) between annular plates 21, 22 and connected to the plates by pins and slots. Plate 21 is detachably secured to the inner element 16 by a number of spring bolts 23, Fig. 6, each engaging a pair of lugs 24 on the plate 21 and a hole in the element 16. The iris diaphragm is opened or closed by rotating the plate 22 by means of pull cords (not shown) attached to a lug 25 on the plate: Specification 724,894 is referred to.