FLOOR-TREATING MACHINE

Abstract: A floor-treating machine comprises a frame (2) with actuating means (10), a housing (3), which is attached to the frame in such a manner that it can rotate about a substantially vertical axis and in which at least three heads (7), which can each rotate about a substantially vertical axis, are mounted, which heads are provided, on their bottom surface, with treating means and/or coupling means for treating means to be coupled to, a motor (22), the shaft (28) of which is concentric with respect to the vertical axis of the frame, which shaft is in driving interaction with the housing and the heads by means of respective transmissions. The transmission for driving the housing comprises an auxiliary shaft (23) which runs parallel to and at a distance from the centre axis of the frame, which auxiliary shaft is connected, via a first auxiliary transmission (25, 26, 27), to the motor shaft and is connected, via a second auxiliary transmission (5, 13, 18), to the housing.

Description: Floor-treating machine The invention relates to a floor-treating machine, comprising a frame with actuating means, a housing, which is attached to the frame in such a manner that it can rotate about a substantially vertical axis and in which at least three heads, which can each rotate about a substantially vertical axis, are mounted, which heads are provided, on their bottom surface, with treating means and/or coupling means for treating means to be coupled to, a motor, the shaft of which is concentric with respect to the vertical axis of the frame, which shaft is in driving interaction with the housing and the heads by means of respective transmissions. A floor-treating machine of this type is known from WO-A-9408752. This known floor-treating machine has the drawback that it is difficult to operate, on account of its relatively unstable behaviour. Moreover, it is difficult to set the speed reduction between the motor and the housing at the desired level. It is an object of the invention to provide a floor-treating machine which avoids this drawback. This object is achieved by the fact that the transmission for driving the housing comprises an auxiliary shaft which runs parallel to and at a distance from the centre axis of the frame, which auxiliary shaft is connected, via a first auxiliary transmission, to the motor shaft and is connected, via a second auxiliary transmission, to the housing. The central positioning of the motor result in a very stable floor-treating machine. Moreover, the two auxiliary transmissions ensure that the centrally positioned motor can drive the housing with the desired speed reduction. A further drawback of the known floor-treating machine is that the two belt transmissions used in this machine are situated inside the housing, making these belt transmissions relatively inaccessible. This is a drawback particularly with regard to the belt transmission which drives the housing. This belt transmission has a relatively high risk of breaking, particularly if the floor-treating machine is used on an uneven floor or a floor with projections and the like. However, replacing the belt for this transmission is rather time-consuming, in view of the difficulty of gaining access thereto. According to the invention, an improvement can also be obtained in this respect, in that the transmission, such as a belt transmission, for driving the housing is situated outside the said housing. The belt transmission is quickly and easily accessible outside the housing. Consequently, the belt can be replaced without much time loss, so that the standstill time of the floor-treating machine is minimal. Preferably, the shaft of the motor bears a driving pulley situated outside the housing, and a driven pulley is attached to the frame and is connected, in such a manner that it can be driven via a belt, to the driving pulley, which driven pulley is connected to the housing. The driven pulley is connected to the housing via a speed reduction mechanism; if appropriate, it is possible to provide a speed reduction means which is connected to the housing via a further belt transmission. This further belt transmission has a belt which is stronger than the belt of the belt transmission situated outside the housing. According to a preferred embodiment, the shaft of the motor is connected via a plug or claw coupling to a journal on the housing for driving the heads, and the belt transmission for driving the housing coincides with the shaft of the motor. In connection with changing the belt, it is merely necessary to remove the motor, an operation which can be carried out relatively quickly and easily on account of the plug coupling. Then, the replacement belt can be fitted and the motor can be reinstalled. Figure 1 shows a cross section through the device according to the invention on line I-I from Figure 2. Figure 2 shows the cross section on line II-II from Figure 1. Figure 3 shows the cross section on line III-III from Figure 1. The device 1 according to the invention which is illustrated in Figure 1 has a frame 2, to which an actuating lever 16, which is only partially illustrated, is attached. The device can be advanced and steered over a surface to be treated by means of this lever 16. The frame 2 also bears a motor 22 which is connected to a drive roll 19 via a shaft 20. The housing 3 is mounted rotatably on the frame by means of bearing 8. As well as the drive roll 19 which has already been mentioned, this housing accommodates three rolls 6 which each bear a head 7. An abrasive disk, by way of example, can be coupled to each head 7 by means of coupling means (not shown). The rolls 6 are mounted in the housing 3 by means of bearings 9, 10. This housing 3 also bears a pulley 18 which is connected to the pulley 5 via the belt 13. This pulley 5 is attached to the shaft 21 which is connected, via speed reduction mechanism 14, to the auxiliary shaft 23. The belt 15 can be held at the desired tension by means of the tensioning rollers 11, 12. Dust, waste, etc. which is produced during the abrasive movement can be collected by means of the apron 17 connected to the frame 2 and if appropriate can be extracted via means which are not shown. The auxiliary shaft 23 is mounted rotatably, by means of a framework 24, on the frame 2 and bears a driven pulley 25, which is driven, via a belt 26, by the driving pulley 27 which is attached to the motor shaft 28. The motor shaft 28 is coupled to the shaft 20 by means of the plug coupling 29. To replace the belt 26, which is preferably weaker than belt 13, it is merely necessary to remove the motor 22.

Claims: Claims 1. Floor-treating machine, comprising a frame (2) with actuating means (10), a housing (3), which is attached to the frame (2) in such a manner that it can rotate about a substantially vertical axis and in which at least three heads (7), which can each rotate about a substantially vertical axis, are mounted, which heads (7) are provided, on their bottom surface, with treating means and/or coupling means for treating means to be coupled to, a motor (22), the shaft (28) of which is concentric with respect to the vertical axis of the frame (2), which shaft is in driving interaction with the housing (3) and the heads (7) by means of respective transmissions, characterized in that the transmission for driving the housing (3) comprises an auxiliary shaft (23) which runs parallel to and at a distance from the centre axis of the frame (2), which auxiliary shaft (23) is connected, via a first auxiliary transmission (25, 26, 27), to the motor shaft (28) and is connected, via a second auxiliary transmission (5, 13, 18), to the housing (3). 2. Floor-treating machine according to Claim 1 , in which the auxiliary transmission (25, 26, 27) is situated outside the housing (3). 3. Floor-treating machine according to Claim 1 or 2, in which the auxiliary transmissions (25, 26, 27; 5, 13, 18) are belt transmissions. 4. Floor-treating machine according to Claim 2 or 3, in which the shaft of the motor (22) bears a driving pulley situated outside the housing (3), and a driven pulley is attached to the frame (2) and is connected, in such a manner that it can be driven via a belt, to the driving pulley, which driven pulley is connected to the housing. 5. Floor-treating machine according to Claim 3, in which the said driven pulley is connected to the housing via a speed reduction mechanism. 6. Floor-treating machine according to Claim 5, in which the speed reduction mechanism is connected to the housing via a further belt transmission. 7. Floor-treating machine according to Claim 6, in which the further belt transmission has a belt which is stronger than the belt of the belt transmission situated outside the housing. 8. Floor-treating machine according to one of the preceding claims, in which the shaft of the motor is connected, via a plug or claw coupling, to a journal on the housing for driving the heads, and the belt transmission for driving the housing coincides with the shaft of the motor.

Inventors: MULLER JOOP HENK, VAN VLIET JOHANNES PETRUS, MULLER, JOOP, HENK, VAN VLIET, JOHANNES, PETRUS
Applicants: HOLLAND IND DIAMANTWERKEN BV, MULLER JOOP HENK, VLIET JOHANNES PETRUS VAN, HOLLAND INDUSTRIELE DIAMANTWERKEN B.V., MULLER, JOOP, HENK, VAN VLIET, JOHANNES, PETRUS
Application year: 2001
Main classification: B24B7
IPC codes: A47L11, B24B7, B24B45, B24B47, F16D1