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US 5,377,375 AGranted
Stair cleaning device
AssigneeBTR plc
InventorsAndrew Holman, Graham Fairbrass
Life of this patent
Estimating the term…
Abstract
A stair cleaning device intended for cleaning the steps and risers of stairs and other confined areas comprises three heads driven by a motor and a belt and pulley system. The belt is toothed on one side and not on the other side so that some slippage can occur. The advantages of this is improved operational comfort and less likelihood of damage to the drive system.
Claims15
A stair cleaning device comprising a plurality of cleaning heads arranged to rotate;
- in a single plane, each head being mounted to rotate about an axis perpendicular to the said plane, a plurality of plain-surfaced pulleys, equal in number to the number of cleaning heads, each one of said pulleys being drivably connected to a respective cleaning head, a toothed driven pulley mounted with its axis of rotation parallel to the axes of rotation of the plain-sided pulleys and a drive belt formed with teeth on one side thereof and being plain on the opposite side, the teeth of the belt engaging with the teeth of the driven pulley and the plain side of the belt frictionally engaged with plain-surfaced pulleys thereby transmitting the drive to the cleaning heads.
Dependencies are inferred from the claim text.