Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1988-02-25
1989-12-26
Peshock, Robert
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
A61C 306
Patent
active
048894893
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a device with spindle and grinding disk, in particular for dentists, as well as a method of manufacturing the grinding disk of the device.
Such devices for dentists are known, for instance, from European Patent Application No. 0,044,701 of Jan. 27, 1982.
They have the disadvantage that they do not permit maximum penetration by the peripheral region of the grinding disk into the spaces between the teeth since the free end of the drive spindle protrudes beyond the grasping disk and thus forms an obstacle.
Furthermore, the protruding spindle can damage or discolor the surface of the tooth during its rotation, particularly when plastic is concerned, such as used, for instance, also for the filling of teeth.
The device in accordance with the present invention avoids these disadvantages .
The invention will be explained below, by way of example, with reference to the drawing, in which:
FIG. 1 is a plan view of a grinding disk with its hub,
FIG. 2 is a cross section through the grinding disk along the section line II--II of FIG. 1,
FIG. 3 is a cross section along the section line III--III of FIG. 1,
FIG. 4A is a side view, partly in section, of the device with the drive spindle and the mounted grinding disk,
FIG. 4B is a cross section through the free end of the spindle according to FIG. 4A, taken in a plane perpendicular to the plane of the drawing of FIG. 4A,
FIG. 4C is a view of the free end of the spindle with the clamp to receive the grinding disk by pressure and elastic deformation,
FIG. 5 is a front view of part of FIG. 4A,
FIG. 6 is a part of the cross section along the section plane VI--VI of FIG. 4B,
FIG. 7 is a variant of a grinding disk with axial opening for reception of the hub, in star shape,
FIG. 8 is a portion of an axial section through a grinding disk placed on the end of a drive spindle in accordance with the prior art and corresponding protrusion of the free end of the spindle beyond the grinding plane of the grinding disk,
FIG. 9 is a section similar to that of FIG. 8 with a flattened disappearing spindle end, in a first embodiment,
FIGS. 10a and 10b are two different embodiments in line FIG. 9,
FIG. 11 shows another embodiment of a spindle end with flattened end and a grinding disk with hub pressed thereon,
FIG. 12 is an axial section through the grinding disk and its hub, in the embodiment shown in FIG. 11,
FIG. 13 is a plan view of the grinding disk with hub, similar to FIG. 12.
In accordance with the various FIGS. 1 to 7, the device comprises a thin grinding disk 1 with its hub 2. Both of these are preferably compression molded from plastic of the same or different kinds, particularly polyesters, there is a drive spindle 5 of metal, for instance brass, stainless steel or else a flexible rigid plastic.
The free end of the spindle is divided, in accordance with the planes 6, 6', into a number of segments, for instance in two planes which are perpendicular to each other as shown, or in three planes which are spaced 120.degree. apart from each other.
The hub has one or more projections 2', 2" which protrude into the notches 6, 6' on the free end of the spindle so as, by form lock, to prevent slippage of the disk 1 with respect to the spindle 5 even if high resistance is produced during the grinding and polishing of the teeth as a result of a high pressure of application.
The clamp 5' of the drive spindle 5 does not protrude from the hub 2, as can be clearly noted from FIGS. 4A and 4B. This has the result that no additional noticeable obstacle is created in the spaced between the teeth. Accordingly, it is possible to bring the grinding disk also to places where the spaces between the teeth are very narrow, which is not possible with the known implements.
A third feature of this device consists in the broadening 5" (FIG. 4A) of the head of the drive spindle so as thereby to create a flat resting surface 5'" against which the flat surface of the hub 2 of the grinding disk 1 comes to rest, thus assuring the completely flat application thereof. This surface is at ri
REFERENCES:
patent: 4601661 (1986-07-01), Du Be et al.
patent: 4624876 (1986-11-01), Nevin
Hawe-Neos Dental Dr. H.v. Weissenfluh AG
Peshock Robert
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