Abrading – Frame or mount – For hanging rigid – rotary abrading tool
Patent
1995-02-21
1997-11-18
Smith, James G.
Abrading
Frame or mount
For hanging rigid, rotary abrading tool
279 20, 279157, 173210, 408 59, B24B 4100
Patent
active
056881630
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a vibration dampening grinding cup for handheld grinding machines for grinding hard metal buttons on button bits, comprising a grinding head and a shaft made with a common axial channel, and a holder for such a grinding cup.
In handheld grinding machines one has hitherto used a conventional clamping sleeve, so-called chuck; as holder for grinding cups for the clamping of the grinding cup. Through the stationary direct, contact between the grinding cup and the clamping sleeve this connection becomes stiff and vibrations generated in the grinding cup will thus easily be transferred to the handle of the grinding machine and thus to the hands and arms of the operator, which at longer exposure may lead to white fingers, which is a contraction of the blood-vessels restricting the blood circulation in the fingers, and also to nerve damage in the hands.
The aim with the present invention is to prevent that vibrations of the grinding cup are transferred to the hands of the operator and thus prevent that white fingers and nerve damages in the hands arise.
This goal is achieved with the vibration dampening grinding cup and holder for this according to the invention, whereby the grinding cup is distinguished in that the shaft is formed with a driver part at its free end and an annular groove between this part and the grinding head, and that a bushing of rubber is arranged on the shaft adjacent to the grinding head, and the holder with a substantially circular socket with a through channel, whose one end is connected with the rotor of the handheld grinding machine and through the other end of which the shaft of the grinding cup is intended to be inserted for installing the driver part of the shaft in a correspondingly formed driving part of the channel of the socket and to be fastened through introduction of bails situated in holes in the wall of the socket at the other end of the socket into the annular groove in the shaft at the inner edge of the groove by means of a between two stops axially movable sleeve arranged about the socket and biassed towards the other end of the socket by a spring, whereby the bushing with fastened grinding cup elastically bears against the socket and against the grinding head.
Through this coordination of the constructive design of the grinding cup and the holder one obtains, instead of the earlier stationary stiff connection between grinding cup and clamping sleeve, a flexible and through the bushing at the same time vibration dampening connection between grinding cup and holder.
Preferably the bushing has a number of bosses at its side turned towards the grinding head and the form of a truncated cone at its side turned away from the grinding head.
The invention will be better understood and objects other than those set than those set forth above will become apparent when consideration is given to the following detailed description thereof. Such description makes reference to the annexed drawings wherein.
FIG. 1 is a cross-sectional view of the preferred embodiment of the grinding cup and holder connected, FIG. 2 is a cross-sectional view of the holder, and
FIG. 3 is a cross-sectional view of the grinding cup.
The invention is described more in detail below with reference to the accompanying drawing in which FIG. 1 schematically and partly in longitudinal section shows a grinding cup and a holder therefor according to the invention connected, FIG. 2 the holder in FIG. 1 separately and FIG. 3 the grinding cup in FIG. 1 separately.
As is shown in the drawing, particularly FIG. 3, the grinding cup 1 according to the present invention comprises a grinding head 2 and a shaft 3 which are made with a common channel 4 for cooling medium, e.g. water or air. In contrast to the shafts of hitherto used grinding cups, in which the shaft is made as a pin with even thickness and circular cross section for fastening in a conventional clamping sleeve of a handheld grinding machine, the shaft 3 of the grinding cup 1 according to the invention is formed with a driver part 5 at its
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Atlas Copco Rock Tools-Published Aug. 1992.
Edwards Dona C.
Smith James G.
Stone Mark P.
Uniroc AB
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