FLOOR CLEANING MACHINE

Abstract: A cleaning machine, especially for professional cleaning, comprises two parallel and cylindrical brushes (2) driven reversedly about a horizontal axis, the brushes being placed so closely together that the ends of the brushes in the plane defined by the rotational axes of the brushes almost join, touch one another or just overlap. Above said plane one or more sweepers (8) in the form of bars, pipes, stretched wires or the like are arranged in the longitudinal direction of the brushes and which are extending into the course of rotation of the brush ends. There is a shield (4) above the brushes for collecting the dirt that is thrown off these when meeting the sweepers. At the exterior of the brushes the shield ends in collecting conduits (6) from which the collected dirt may pass to a collecting tank. This design proves capable of performing a simultaneous sweeping and washing of a floor. At the same time the construction is sufficiently compact to accomodate a per se known polishing unit such that a simultaneous polishing of the floor is possible.

Description: Floor cleaning machine The present invention relates to a cleaning machine, especially for professional cleaning and having two parallel and cylindrical brushes driven reversedly about a horizontal axis. In commercial cleaning of large floor spaces as e.g. in super markets, sales rooms, schools, sports centres, nursing homes, hospitals and industrial pre¬ mises having a solid flooring such as linoleum, marble tiles, wood, an initial mopping is carried out to remove loose dirt from the floor. This is typically carried out manually by using mops. Then a mechanical washing of the floor is carried out and if required a polishing of the floor can finish the job. This is also performed mechan¬ ically, but the polishing cannot begin until the floor has dried after washing. Such a cleaning demands three individual workings of the floor at the same time wait¬ ing for the floor to dry before the polishing can be initiated. The type of floor washers found most frequently is based on rotating brush roundels, typically two or three. The cleaning agent is dosed in the centre of the roundels. In some cases at the front. After the roundels comes a suction foot consisting of two closely set rub¬ ber lips from which surplus water left after the roundels is sucked up into a collecting tank. The floor is left sufficiently dry for it to be walked on, but not sufficiently dry to be polished immediately. Certain large automotive models of floor washers have a rotating cylindrical horizontal brush intended to sweep the floor in front of the roundels. The brush, however, sweeps the dirt forwardly into a funnel situated in front and raised above floor level, which is not particularly effective. This type of floor washer is also unable to function when close to walls or racks. Another type of floor washers that has come on the market comprises a rotating, cylindrical, horizontal brush at either side of a collecting tank. A vertical rubber belt is placed between the brushes and the tank. The brushes sweep the dirty detergent towards the rubber belts, it is led upwardly and is scraped off at the upper edge of the collecting tank and falls down into this. The washer has the advantage over the other type that it can come closer to walls and racks and that dirt that has not been collected at one brush can be col¬ lected by " the reversed rotation of the other one. Despite its virtues this floor washer, too, is only capable of performing a washing of the floor. The present invention introduces a completely dif¬ ferent and new principle rendering it possible to con¬ struct a cleaning machine such that it can sweep, wash and polish the floor simultaneously. According to the invention the cleaning machine comprises at least two parallel and cylindrical brushes driven reversedly about a horizontal axis, where these are placed so closely together that the ends of the brushes in the plane de¬ fined by the rotational axes of the brushes almost join, touch one another or just overlap, and that above this plane one or more sweepers in the form of bars, pipes, stretched wires or the like is/are arranged in the long¬ itudinal direction of the brushes and which are extend¬ ing into the course of rotation of the brush ends and that above the brushes there is a shield for collecting the dirt that is thrown off these when meeting the sweepers, and where the shield at the end of the brushes ends in collecting conduits running in the longitudinal direction to the brushes, wherefrom the collected dirt may pass to a collecting tank. It is found that a single set of brushes can per¬ form a sweeping and a washing of the floor and leave it sufficiently dry to be walked on. By the close placing of the brushes a comparatively heavy suction effect arises in the wedge area facing the floor between the two closely set brushes sucking up the dirt which is transported on along, between and up onto the upper sides of the brushes. When the brushes meet the sweepers they are bent backwardly and the instant they leave the sweepers the dirt is thrown out onto the lower side of the shield and respectively falls or runs down into the collecting conduits. The best effect so far has been noted in segment brushes, i.e. brushes where the indi¬ vidual tufts are placed in rows and of a water-repellent material such as polypropylene. Preferably two sweepers per brush are arranged, one before the summit and one after the summit. With this combination the brushes are completely clean and dry before they again come into contact with the floor and the cleaning agent. The sweepers are either bars or pipes placed axially paral¬ lel to the brushes, but stretched wires could be used. The cross sections of the sweepers are in fact of secon¬ dary importance as long as they do not have sharp edges that can break or cut the tips of the brushes. The ex¬ tension range of the sweepers into the course of the brush ends can be adjusted for achieving the maximum effect and compensation for wear of the brushes. The construction has the further advantage that the energy consumption is comparatively low which is of special importance in machines running on accumulators. Naturally, the cleaning machine according to the invention can be substantiated ranging from a small manually operated machine for small jobs to larger auto¬ motive machines having several pairs of brushes placed next to one another. For floors that are particularly difficult to clean even further pairs of brushes may be placed after one another where the first set might ex¬ clusively perform a sweeping function. For carrying out a subsequent polishing the machine may be provided with a usual polishing unit placed after the brush section. Between the brush section and the polishing unit a suction foot may be inserted for an extra drying of the floor prior to the polishing, just like an air-drying may be arranged, preferably using the air from suction devices, which air in itself is slight¬ ly hot. Incorporating a polishing unit into the machine is rendered possible by its otherwise compact shape. The invention shall be described in further detail in the following with reference to the attached drawing, in which:- Fig. 1 illustrates the basic principle of the machine according to the invention in the form of a cross-section through the brush section. Fig. 2 illustrates the section in a direct view as seen from the front or the rear. Fig. 3 is a schematic longitudinal section of an automotive cleaning machine according to the invention. Fig. 4 is also a schematic outline of the machine, and Fig. 5 is an enlarged view of a cross-section of the brush section of the machine. The basic principle of the brush section, which is the vital part of the cleaning machine, is illustrated purely schematically and comprises two cylindrical brushes 2 driven reversedly. Above the brushes is placed a shield 4 which at either side of these ends in a col¬ lecting conduit 6 for the dirt and the dust, from which it may pass into a collection tank. Extending into the course of the brush ends are arranged two sweepers in the form of transverse round bars 8, two to each brush. One sweeper is placed before the summit of the brush and the other after the summit such that dirt and dust part¬ ly are thrown towards the shield and partly directly down into the collecting conduits. The dirt can be passed along from the collecting conduit 6 in a variety of ways; one method is by design¬ ing the conduit with a slanting bottom facing a suction inlet 10 as indicated in Fig. 2 of the drawing, illu¬ strating the machine as seen in its forward direction, whereby the airflow, which from the brushes is sent underneath the shield, is directed down along the bottom towards the suction inlet tearing the collected dirt along, just like the water can run towards the suction inlet by itself. The shown brush section is the basic element of the invention and can form basis for substantiating the invention from a simple manually operated apparatus to an automotive cleaning machine as illustrated in the following as an example. An automotive cleaning machine is shown in Figs. 3 and 4 of the drawing. The machine, which is three- wheeled, is constructed on a chassis frame 12 and is actually power operated. The front wheel 14, which is placed in the longitudinal axis of the machine, is a steering and driving wheel and is operated by a lever 16, into which various function keys and operating levers have been fitted. The driving wheel is of the same type as those used in pallet lifting trucks, i.e. a solid rubber wheel being driven directly by an electric motor. The two rear wheels 18 are placed at the sides below a battery section 20. Counted from the front of the machine a brush section is mounted which as a whole is designated 22 and is as previously described, then a suction foot 24 fol¬ lowed by a blowing rail 26 and last a polishing section 28. The brush section is mounted in an intermediate frame which again by a spring at each corner is mounted in the frame such that the brush section automatically follows the unevenness of the floor. The pressure of the brush section against the floor can be adjusted by a hydraulic cylinder mounted in the chassis and fastened to the centre of the brush section. Water is used for hydraulic liquid such that a possible leakage does not leave stains on the floor. Even a minor leakage of hydraulic oil would leave spots and stripes on the floor. The brush section is in principle constructed in the same manner as above. The entry of the sweepers 8 into the course of the brushes 8 can here be adjusted by an adjusting mechanism. The sweepers 8 are fastened at the end of a link 30 which by its other end is rotatably mounted 32 in the ends of the section. The link is further attached to a bar 34, the threaded end of which has been led up onto the upper side of the section where an adjustment nut 36 with a locking screw 38 are situ¬ ated. By turning of the adjustment nuts the sweepers can be brought to interact more or less with the ends of the brushes. The sweepers can be locked in the desired posi¬ tion by the locking screws. To lead the dirt to the central exhaust 10 a brush 40 is placed in the conduits 6 with brushes placed in a right-hand helical in one half and in a left-hand helical in the other half. The brush is driven in such a manner that the dirt from the ends of the conduits is led to the exhaust. The conduits are here straight having a circular cross-section or rather a semicircular cross-section. The two main brushes 2 and the conduit brushes 40 are driven by a mutual electric motor via a belt drive, alternatively a gear. The suction foot 24 consists of two pieces, a fixed part 42 and a sideways displaceable part 44 engaging the walls and such like vertical boundaries of the room. The sideways displaceable part 44 is mounted in a slide rail and is spring-loaded to its extended position which is limited by a fender rail at the side of the machine. The rail is by its front pivotally fastened to the machine and the maximum movement is determined by a stop, e.g. in the hinge. When the machine moves up to a wall the fender rail will cause the suction foot to retract and when the obstruction has been passed the suction foot returns to its extended position due to the spring load¬ ing. The brush section as well as the suction foot are connected to a suction apparatus. In order to avoid an out-of-balance suction, each side of the brush section has an associated suction apparatus, and likewise is the suction foot connected to an independent suction appa¬ ratus. The filtered exhaust air from the suction appa¬ ratuses is led to the blowing rail 26 for further drying of the floor. The suction foot and the blowing rail 24, 26 are as a unit mounted in the chassis frame via paral¬ lel motion bars 46, such that these also are moving along the floor surface. The polishing unit 28 is constructed on a frame which at its front is pivotally mounted in the chassis. By an electric actuator 48 fastened to the chassis and to the opposite side of the frame the polishing unit may be lowered into engaging the floor surface. The connec¬ tion between the actuator and the polishing unit is a linkage 50 where one link is rotatably mounted in the chassis. From a clean water tank 52 water is sprayed onto the floor via a nozzle arrangement placed in front of the brush section 22. In order to sweep up to walls, pillars, racks and similar vertical limitations of the room the machine is provided with a side brush 54 at its front. Otherwise the floor is swept and washed by the brush section where the dirt and the water from the conduits are led to each their waste container 56, 58 at the rear of the machine. Any surplus water is sucked up by the suction foot 24 and is led to a used water tank 60. The three tanks are placed at the rear of the machine together with the suction apparatuses that have been integrated into a unit 62. The tanks are detachable with lids 64 having incorporated edge lining and where the lid by a toggle link 66 may be squeezed down into tightening engagement with the tanks and retention of these. With three separate tanks 56, 58, 60 these are no larger than enabling one man to lift these out of the machine to be emptied. The battery section 20 is enclosed inside a glass fibre box and is standing at a roller path fastened in the chassis such that the section as a whole may be rolled sideways out of the machine and e.g. across to a truck. The battery section is thus quickly replaced by another fully charged section allowing an optimum utili¬ zation of the machine. The machine may be brought from place to place on an especially designed trailer. It will be seen that the machine distinguishes itself by having the ability of finishing the cleaning of a floor in one run, i.e. sweeping, washing, drying and polishing. The machine cleans right up to walls, pillars, racks and similar vertical limitations of the room. If, for example, only a sweeping and a washing of the floor is required, the polishing section can be disconnected by raising it.

Claims: C L A I M S : 1. A cleaning machine, especially for professional cleaning and comprising at least two parallel and cyl¬ indrical brushes (2) driven reversedly about a hori¬ zontal axis, the brushes being placed so closely to¬ gether that the ends of the brushes in the plane defined by the rotational axes of the brushes almost join, touch one another or just overlap is characterized in that above this plane one or more sweepers (8) in the form of bars, pipes, stretched wires or the like are arranged in the longitudinal direction of the brushes and which are extending into the course of rotation of the brush ends and that above the brushes there is a shield (4) for collecting the dirt that is thrown off these when meet¬ ing the sweepers, and at the exterior of the brushes the shield ends in collecting conduits (6) from which the collected dirt may pass to a collecting tank. 2. A cleaning machine according to claim 1, charac¬ terized in that for each brush two sweepers are ar¬ ranged, one placed before and one after the summit of the brush. 3. A cleaning machine according to claims 1 or 2, characterized in that the cross sectional dimension of the sweepers is several times smaller than the diameter of the brushes. 4. A cleaning machine according to claims 1, 2 or 3, characterized in that the mounting of the sweepers comprises an adjustment device (30-38) such that the sweepers may extend more or less into the course of the brushes. 5. A cleaning machine according to claims 1-4, characterized in that it comprises several sets of brushes arranged next to and/or after one another. 6. A cleaning machine according to claims 1-5, characterized in that it comprises a per se known pol¬ ishing unit (28) placed after the brushes (22) . 7. A cleaning machine according to claim 6, charac¬ terized in that in that a suction foot (24) is placed between the brushes (22) and the polishing unit (28) . 8. A cleaning machine according to claim 6, charac¬ terized in that the suction foot comprises a longitudi¬ nally displaceable part (44) extending from the side of the machine and which can engage the side contours of a room. 3. A cleaning machine according to claims 7 or 8, characterized in that an air nozzle arrangement is ar¬ ranged after the suction foot (24) , preferably in the form of a rail (26) emitting air down towards the floor for drying this preferably using the exhaust air from the suction devices. 10. A cleaning machine according to one of the claims 1-9, characterized in that the outlet (10) of the conduits of the brush section each is connected to its own suction device and the same applies to a possible suction foot, and attached to separate collection tanks (56, 58, 60). 11. A cleaning machine according to one of the claims 1 - 10, characterized in that in the conduits there is a brush (40) prefer¬ ably driven and with the brush elements arranged in helicals for transportation of the collected dirt to the outlet (10).

Inventors: ANDERSEN OLE NYGAARD, ANDERSEN, OLE, NYGAARD
Applicants: CLEAMATOOL AS, CLEAMATOOL A/S
Application year: 1993
Main classification: A47L11
IPC codes: A47L11