Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1984-05-16
1986-01-14
Peshock, Robert
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
433165, A61C 112
Patent
active
045643547
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to an angle piece for dental purposes, comprising a tool with cylindrical tool shaft, which tool is supported in the head part transversely relative to the drive axle and is securely connected with its drive gear wheel and is interchangeable together with the latter. In addition, the invention is directed to an apparatus for locking this structural component group, particularly provided that the angle piece is an integral structural component part of the cylindrical head shaft without projecting parts.
In a known angle piece of this type, according to U.S. Pat. No. 4,268,252, a construction of the angle head is described according to which the latter forms the closure of the cylindrical head shaft and does not project over its circular cross-section of the latter. A graduated cross borehole of the head shaft forms the bearing surfaces for the drilling tool formed from the tool shaft and the drive gear wheel fastened on the latter. The end face of the gear wheel on the tool side forms a spherical cap with a radius of curvature equal to the radius of the head shaft and, when the tool is employed, closes so as to be flush with the casing surface of the head shaft. A cylindrical sleeve overlaps the head shaft and the part of the angle head, can either be rotated or axially displaced on the shaft and is provided with openings which, according to the detail shown, either free the cross borehole of the head shaft or partially cover it. as desired, in order to make it possible to introduce or hold the tool, respectively, in the working position. This construction of an angle piece head offers the possibility of a very small manner of construction without projecting parts of the head, but it also involves disadvantages. For example, because of the fact that the bearing of the driven gear wheel connected with the tool shaft is effected in the cross borehole of the angle piece shaft, the diameter of the bearing on the tool side is attached to the largest diameter of the gear wheel in order to be able to remove the drive from the head. This bearing is therefore greatly heated during operation at the high speeds usual today and, moreover, this has the result that the entire head shaft must be replaced during the necessary replacement after wear, which means costly repairs. In addition, it is disadvantageous that the gear wheel member does not have a sufficient flat bearing frontally against the tool, since its spherical end face has line contact against the wall of the locking sleeve at only two places at best and rapid wear will result at this place. A further disadvantage is to be seen in that the longitudinal or transverse slots provided for passing the tool shaft in the locking sleeve interrupts the end bearing surface of the gear wheel drive, wherein the edges of the slot act on the rotating end face of the gear wheel like scrapers and cause the highly undesirable emergence of lubricant in the direction of the tool. Finally, it must be mentioned that in order to change the tool the locking sleeve embracing the head shaft must be turned or axially displced by hand and that it can be very troublesome to handle this thin, smooth sleeve in the small dimensionings of the structural type indicated, particularly because this sleeve must be fixed in its working position by means of friction so that it can not loosen unintentionally and because, in addition, the outer casing of this sleeve serving as a hold is moistened by saliva during practical use and this makes manual handling difficult. This deficiency becomes especially clear when it is mentioned that the locking sleeve of such an angle piece has an outer diameter of 6 mm at most; that is, it is substantially thinner than a pencil.
It is the object of the present invention to avoid the disadvantages of the known angle pieces with respect to the bearing and replacement of the drilling tool, as well as the disadvantages of the locking apparatus, without restricting the possibilities of producing such an angle piece with a cylindrically smooth
REFERENCES:
patent: 2010421 (1935-08-01), Terry
patent: 2090885 (1937-08-01), Clark
patent: 4285671 (1981-08-01), Lustig et al.
Dentalwerk Buroos Gesellschaft m.b.H.
Peshock Robert
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