US1299137A - Dental tool. - Google Patents

Description

-C. H. DAVIS, DECD.

B. B. DAVIS! EXECUTRIX.

DENTAL TOOL.

APPLICATION man FEB. 2, ms.-

1,299, 1 37. Patented Apr. 1,1919.

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.CHARLES H. DAVIS, OF WORCESTER, MASSACHUSETTS; BERTHA B. DAVIS EXECUTBIX OF CHARLES H. DAVIS, DECEASED.

DENTAL TOOL.

Specification of Letters Patent.

Patented Apr. 1, 1919.

To all whom it may concern:

Be it known that I, CHARLES H. DAVIS, a citizen of the United States, residing at Worcester, in the county of Worcester, State 4 of Massachusetts, have invented a certain new and useful Improvement in Dental Tools, of which the following is a specification, reference being bad therein to the accompanying drawings.

This invention relates to dental tools, but more particularly to such as are used in cleaning, polishing or grinding teeth, and has for its object to provide a structure which is more eiiicient than any devices of a similar nature heretofore known.

In the case of tooth cleaning devices consisting wholly or partially of flexible or semi-flexible material, and particularly those having at least the central portion of rubber or other pliable or resilient material, great difliculty has been found in securing means for holding the same so that relative rotation is impossible. that such pliable or resilient centers shall not be cut by the holding means, and that freedom of action shall be obtained.

One feature of the present invention is the mandrel in which the hub of the tooth operating tool is bound by the forcing of the flexible or resilient material of such hub substantially away from the axis of the binding screw or other member performing this function. A second feature is the formation of the mandrel head with indentations or perforations therein in which the flexible material of the hub of the tooth operating tool is forced or held by the action of the binding member. Another feature is the formation upon the hub of the tooth operating tool of projections adapted to enter corresponding indentations or orifices in the mandrel, so that such tool will be rigidly'positioned and maintained therein to facilitate the insertion of the binding screw or. other similar means, and when bound therein by the action of such screw to act in conjunction with the inner or bind ing face of the mandrel to prevent relative rotation of the mandrel and tooth operating tool. A further feature of the invention is the tool having a rigid or substantially rigid operating portion and a flexible or resilient central portion or hub which will provide a firm grip upon the mandrel and will permit of freedom of action of the tool and rocking of such tool relative to the axis of the mandrel.

Many other features and advantages of the invention will be described hereinafter and included in the claims.

Referring to the drawings:

Figure 1 is a side elevation of one embodiment of the invention.

Fig. 2, central longitudinal section of the embodiment shown in Fig. 1 with the parts in their relative position for assembling.

Fig. 3, same as Fig. 2, but with the parts assembled.

Fig. 4, side elevation of the tooth operating tool detached from the mandrel, as will be fully described hereinafter.

Fig. 5, side elevation of a modified form of the invention, as will be fully described hereinafter.

Fig. 6, side elevation of the tooth operating tool in the embodiment of the invention shown in Fig. 5, as will be fully described hereinafter.

Fig. 7 central longitudinal section of a further modification of the invention, as will be fully described hereinafter.

Fig. 8, side elevation of a modified form of the tooth operating tool, as will be fully described hereinafter.

In the embodiment of the invention shown in Figs. 1 to 4 inclusive, the invention is shown to comprise a mandrel 20 formed with a shank 21 adapted to be inserted in the usual form of rotary shaft machine found in dental operating rooms. At the forward end of this shank is formed the head 22 which is adapted to receive and hold the hub of the tooth operating tool 23 here shown of the rubber cup variety. For the sake of simplicity of description this tooth operating tool will be hereinafter referred to as the tool, and while this tool is shown of the cup variety it should be clearly understood that any of the many forms of dental tools might be substitutedtherefor, provided they are constructed with a flexible, resilient or expansible hub or central portion, or the evident equivalent thereof.

In this embodiment of the invention, the head is formed substantially cup shaped with the outer rim of the cup extending substantially parallel to the axis of the mandrel, and it has been found to be advantageous that the inner or operating face of such head should be substantially cup shaped or with its side walls projecting forwardly from the center or base of this face of the mandrel for the reasons which will be readily evident from the following description. In the inside walls of this head are here formed one or more indentations or orifices 24 to receive the hub of the tool 23, though these indentations or orifices are not essential to the construction as will be described in connection with the embodiment shown in Fig. 7 While it is in no way essential that these indentations 24 should pass through the walls of the head, it has been found that this is the easiest method of forming them. Projecting forwardly from the base of the operating face of the mandrel is preferably constructed a member 25 through which passes the threaded hole 26 concentric with the axis of the mandrel. This threaded hole is adapted to receive the binding screw 26 and the outer extremity of the member '25 forms a seat for the head of this screw to prevent such head from advancing into contact with the base of the operating face of the mandrel. This seat for the head of the screw has been found to be very advantageous in preventing the screw from advancing sufficiently to force its way entirely through the hub of a tool in which the flexible or resilient portion of the hub is larger than the diameter of the head of the screw. hen indentations or orifices 24: are formed in the head of the mandrel, it has been found to be somewhat advantageous to form corresponding projections 27 on the hub of the tool for the reason which has been stated in connection With the indentations 24, but these are not essential as will be fully explained in connection with the embodiment shown in Fig. 7

In Fig. 5 is shown a modification of the invention in which the indentations or orifices 28 in the head 29 of the mandrel 30 are oblong instead of round as was the case of the embodiment shown in Figs. 1 to 4 inclusive. Vith this form of indentations or orifices it is advantageous to use a tool having projections 31 thereon corresponding to and preferably fitting the indentations or orifices 28 as is shown in Fig. 6 of the drawings.

In the embodiment shown in Fig. 7 the structure is substantially identical with those shown in Figs. 1 to 6 inclusive with the exception that no indentations or orifices are formed in the head 32 of the mandrel 33. In this figure the tool is shown entirely composed of rubber and through the center thereof is an orifice 34 through which passes the binding screw 35 and this central orifice 34 is preferably of smaller diameter than the head 36 of the screw so that when such screw is advanced in the tapped hole in the mandrel in the usual manner, the hub is expanded by the wedging action of the head and such head advances until it becomes seated in the member 37. This expanding of the hub by the action of the head of the binding screw or pin forces the outer wall 38 of the hub against the opposing inner face of the mandrel and thus causes the tool to be bound about the periphery of such hub as well as against the base of the cup face of the mandrel. It has heretofore been common practies to bind a tool upon a mandrel with a binding screw, and no invention is claimed on this structure when broadly construed,

but it is believed that in all cases heretofore the binding has been performed by pressure exerted substantially parallel with the axis of the binding screw only. Where such material as rubber having certain adhesive or gripping qualities is used, it has been found that generally suflicient hold will be obtained on the tool to prevent relative rotation of such tool and the mandrel, but the use of an indented or perforated head gives additional holding power which insures absolute hold.

In the latter case not only are the projections upon the hub, if these are used, held within such indentations or orifices, but a certain amount of material forming the body of the gub is forced therein as will be readily evient.

In Fig. 8 of the drawings is shown a modified form of tool in which the cup shaped or operating portion 39 thereof is constructed of abrasive material and the central portion or hub 40 is of flexible or resilient material to permit of ready use in the mandrel described in Figs. 1, 2, 3, 5 and 7 In this form of tool the hub may be formed separate from the operating portion and either cemented, vulcanized or otherwise fastened thereto, or they may be formed integral and the operative portion provided with the abrasive material and vulcanized or otherwise treated to produce a rigid or semi- -rig id portion if desired.

In all the embodiments herein shown and described, it is advisable to make the head of the screw with its upper and lower faces, or particularly the lower one either conical or rounded to facilitate the hub expanding action thereof and to obviateany possibilityof the rubber or other hub material being cut by the sharp edges thereof, though it should be clearly understood that this is not essential to the construction.

What I claim as my invention and desire to secure by Letters Patent is 1. In a device of the class described, a tool provided with a projecting hub, a mandrel having a socket formed therein to receive the projecting portion of said hub, the walls of said socket being indented, and means for expanding said hub within said socket.

2. As an article of manufacture, a tool, a said face when the tool is in its bound posimandrel provided with an axial erforation, tion in the mandrel. 10 a headed pin ada ted to pass '0 rough said In testimony whereof I aflix my signature tool and have its orward portion held within the presence of two Witnesses.

in said erforation to secure said tool to said CHARLES H. DAVIS. mandre and means projecting from the Witnesses:

binding face of said mandrel for maintain- HARTLEY W. BARTIE'I'I,

ing the head of such pin at an interval from HANNAH M. KENNEDY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner 01' Iatents, Washington, D. 0.

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