Abrading – Frame or mount
Reexamination Certificate
2000-04-10
2001-12-18
Hail, III, Joseph J. (Department: 3723)
Abrading
Frame or mount
C451S259000, C451S350000
Reexamination Certificate
active
06331138
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to grinding machines.
2. Introduction to the Invention
U.S. Pat. No. 1,928,390 discloses a grinding machine comprising a frame having a rotary casing that bears rotary holders for grinding discs, as well as a drive motor which is mounted on the frame and interacts with the casing and the holders to drive the machine. In this machine, a drive shaft is connected to the drive motor via a gear transmission and to the casing, which can thus be brought into rotation; and the holders for the grinding discs are brought into rotation via a V-belt, which is fed around a stationary pulley on the frame, and pulleys on the shafts of the holders.
A drive system of this type has various disadvantages. For instance, it is not easy to change the relative speeds of rotation of casing and holders with respect to one another, nor is it easy to change their relative direction of rotation. Because the drive shaft is connected directly to the casing, a reduction unit has to be incorporated between drive motor and said drive shaft, since otherwise the casing would rotate too rapidly.
SUMMARY OF THE INVENTION
The aim of the invention is to provide a grinding machine which does not have these disadvantages. Said aim is achieved in that the drive motor is connected by means of a continuous flexible or articulated element to the holders for driving the latter in the direction of rotation, and in that at least one of the holders is coupled to the frame by means of a gear transmission, in order to bring the casing into rotation when said holder is driven. The word “flexible” is used in this specification in its normal dictionary sense to mean “capable of being bent without breaking”. Thus the term “flexible element” includes but is not limited to an articulated element.
With the grinding machine according to the invention the drive motor is connected to the grinding discs, which can be driven at a relatively high speed of rotation. It is therefore not necessary to provide a reduction transmission in the drive shaft: any necessary reduction in speed can easily be obtained by selecting, in a suitable manner, the diameters of the pulleys concerned.
The casing can rotate at an appreciably reduced speed of rotation, in which context the reduction in speed can be supplied by the gear transmission.
Said gear transmission can be obtained in wide variety of ways. However, an embodiment in which the frame has a sun gear that interacts with at least one satellite gear, which is rotatably connected to the casing and interacts with the at least one holder, is preferred.
In order to obtain the desired reduction in speed and/or relative direction of rotation of holders and casing, the at least one holder can have a shaft with a gear, which gear interacts with the satellite gear.
REFERENCES:
patent: 1928390 (1933-09-01), Myers
patent: 2948087 (1960-08-01), Caton
patent: 4328645 (1982-05-01), Sauer
patent: 5637032 (1997-06-01), Thysell et al.
patent: 2929479 (1981-02-01), None
Muller Joop Henk
Van Vliet Johannes Petrus
Witters Gilbert Filipe Maria
Hail III Joseph J.
Holland Industriele Diamantwerken B.V.
Shanley Daniel
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