GB383498A - Improvements in or relating to fans, ventilators, or the like - Google Patents

Abstract

383,498. Screw fans. AKTIEBOLAGET SPONTAN, 2, Norrmalmstorg, Stockholm. Feb. 25, 1932, No. 5666. Convention date, March 3, 1931. [Class 110 (i).] In an electric fan of the table, wall bracket or like type, the driving motor is surrounded by a hub rigidly secured to the motor shaft and adapted to carry fan vanes and forming a cover independent of and easily removable from the motor. A stream-lined hub 5 is fitted with a bush 8 mounted on the conical pin 10 of the motor 4. Slots 11 in the hub are arranged obliquely to its axis and may.be curved. They extend into openings 12 which allow the insertion into the slots of flexible vanes 6, such as described in Specification 368,204, and also serve for cooling the motor. The slots 11 for each vane may be displaced relative to one another in the peripheral direction. The motor is secured to an arm 3 which is pivoted on a base 2 so that it will remain in any desired position of angular adjustment. For this purpose the base of the arm has a cylindrical surface and is connected by a spring 15, arranged to counterbalance the weight of the motor, to a stud 18. Abutments 40 limit the angular movement. Pivotal movement in more than one plane may be obtained by the provision of a ball-joint. One lead 23 of the electric supply cable 19 is connected to a rheostat 25, the other 24 is led to the motor and returns to a screw 29 mounted on a metal plate 28 connected to a sliding contact 30 engaging the contacts 34 of the rheostat and provided with a switch arm 32 by movement of which the fan may be given any of three different speeds. A rubber strip 38 of angular cross section is held against the base by a plate 36, and serve as a support for the fan. The hub 5 and other external parts may be of insulating material such as a synthetic resin.