Patent GB-677190-A (GB)
Title: Improvements in or relating to floor polishing or treating machines
IPC: A47L11/16
Filed: 1950-05-18
Abstract: 677,190. Floor-polishing machines; reservoir brushes. ELECTROLUX Ltd. May 18, 1950 [July 1, 1949], No. 12442/50. Classes 19 and 138 (i) A floor polishing or treating machine comprising a plurality of spaced members rotatable about vertical axes and means for rotating the members has a treating liquid tank whose discharge opening is located externally of the space between the said members so that when the machine is moved over the surface in the direction of the vertical plane through the machine handle towards liquid discharged on the surface,.the liquid will be contracted by a region of one of the said members at a point in its path of rotation such that centrifugal force produced by said member will cause the liquid to be thrown from said region toward at least one other rotating member. The machine, Fig. 2, comprises three discs 13, 14, 15, rotatable about vertical and parallel axes by an electric motor in a housing 10- A tank 20 for flow treating liquid is deta,chably mounted at the rear edge of a housing 17, Fig. 4, surrounding the discs which may be fitted with brushes 16 which in turn may be fitted with felt polishing discs (not shown). The tank 20 which comprises two parts 21 and 22 suitably interconnected is attached to the machine by means of hooks 24 and wire straps 23. The straps are supported in a swingable manner on the part 21 in sockets 25 so that when the tank is detached they may be swung into a position substantially parallel to the length of the tank. The outer ends of the straps engage in openings in bolts by which a fork 12 for a handle 11 is pivotally secured to the housing 10. The outer ends of the straps are also formed with loops which serve as handles for' detaching the tank from the machine. When the tank is. detached it can rest on a surface on three points of support formed by the hooks 24 and a stud 30. The tank has a filling opening 31 closed by a plug 32 and a base opening 35 controlled by a valve spindle 33. The spindle 33 may be lifted against the action of a spring 43, by a flexible member 40 such as a Bowden cable or chain operable from the handle of the machine. In the lifted position a groove 39, Fig. 5, in the spindle facilitates venting of the tank by placing the tank in communication with the atmosphere through a bush 34 and washer 38. Cam surfaces 37 enclosing a passage to the opening 35 serve to guide the spindle 33. As shown in Fig. 2 the valve 33 and thus the opening 35 are located adjacent a point on the path of rotation of the disc 14 where it is directed towards the disc 15 such that a tangent to the disc 14 at a point thereon nearest the valve 33 will pass through the disc 15. The opening is also located between two vertical planes parallel to the handle 11 one plane passing through the centre of the disc 14 and the other being tangential to the disc 15 at a point adjacent the disc 14. By this arrangement of the opening, when the polisher is moved to the right in Fig. 2 the liquid delivered to the floor is contacted by parts of the brushes on discs 14 and/or 13 located at points at which the centrifugal force produced by the brushes tends to throw the liquid towards the two other brushes or either one of them. Spattering of liquid by the rotating brushes over furniture or walls is thereby prevented.