Dentistry – Apparatus – Having motor or means to transmit motion from motor to tool
Patent
1985-01-11
1986-06-17
Wilson, John J.
Dentistry
Apparatus
Having motor or means to transmit motion from motor to tool
433127, 279 83, A61C 114
Patent
active
045953627
DESCRIPTION:
BRIEF SUMMARY
The present invention is directed to a handle, particularly but not exclusively for use in dentistry, made up of a rotor, namely a shaft mounted on at least two antifriction bearing means, with the rear end of the shaft being provided with a connection for any kind of transmission and the opposite end thereof comprising a cylindrical socket wherein an also cylindrical sleeve is fitted in which, at least partly, at least one longitudinal slot is provided thoroughly penetrating the sleeve, said sleeve being intended to receive the cylindrical shank of a round tool of any kind, as well as of a tripartite body forming a shell of the rotor, with the first part thereof comprising an at least partly cylindrical nosepiece in which the rotor is suspended through its antifriction bearing means, the second part comprising a grooved ring embracing with sliding friction the cylindrical portion of the nosepiece, and the third part comprising a rear member which is secured to the rear portion of the nosepiece.
In handles of this kind used at the present time particularly in dentistry, a known problem is the difficulty of retaining in the sleeve the cylindrical shank of any round tool. In fact, the problem is to ensure a firm hold of two cylindrical elements which are non-slidably fitted together, and intended to be driven by the same rotary drive and of which one, the tool, is in addition to be subjected at the end of its shank to a frictional force. In other words, the cylindrical shank of a frictional force. In other words, the cylindrical shank of a rotary tool fitted with non-sliding friction in an also cylindrical sleeve is to be fixed in this sleeve in a way such that if a strong axial torque is imparted to the sleeve and the tool (grinding disc, milling cutter) has to overcome a frictional force, the cylindrical shank will not slip in the sleeve.
Handles employed in dentistry may, quite generally, be classified in two groups, depending on their purpose or use: a first group including handles for practicing dentists and having a tool shank receiving caliber varying between 1.60 and 2.35 mm, and a second group including laboratories' handles having the same calibers varying between 2.35 and 3.17 mm. Nevertheless, irrespective of their destination or use, these handles have basically the same technical properties relating to the manner of holding fast a cylindrical shank-type tool. They are all provided with a cylindrical sleeve in which the shank of the tool is received with a non-sliding fit and which has at least one longitudinal slot penetrating through the sleeve along at least a part of the extension thereof. Two, or even four, such slots may be provided, depending on the design. To fix and hold the cylindrical tool shank in the sleeve, the flexibility due to the above mentioned properties thereof is utilized. If the sleeve itself is also cylindrical, the tool shank holding force is to be exerted perpendicularly to the axis thereof, which may be embodied by a cam, a lever, by an kind of spring or spring washers, or even by balls or rollers acting on any member of complementary shape. If the sleeve is conically tapered or of a combined cylindrical and conical shape, the force for holding the tool shank may also be exerted perpendicularly to the axis thereof by means such as just mentioned, however, in most instances, it will be exerted lengthwise by means of a tightening member, with the conical portion of the sleeve being compressed by a part of complementary shape.
Prior art means for holding the tool shank fast in the sleeve, as provided particularly in dentistry handles, have proved not quite effective, i.e., since mainly laboratories' handles were concerned which are used for rough trimming, thus exposed to considerable frictional forces, it was observed that the tool shank had the tendency of advancing or of slipping in the sleeve.
The invention intends to eliminate these drawbacks while still preserving simplicity in manipulation of the handle.
This is achieved by the features set forth in the claims.
The
REFERENCES:
patent: 310467 (1885-01-01), Ross
patent: 610483 (1898-09-01), Fritz
patent: 2938698 (1960-05-01), Johnson
patent: 4199160 (1980-04-01), Bent
Mosimann David
Wilson John J.
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