US2674799A - Tooth extractor - Google Patents

Description

April 13, 19 54 1 w R FRASER 2,674,799

TOOTH EXTRACTOR Filed Dec. 1, 1952 William F arquhar Fraser HVVENTUR.

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Patented Apr. 13, 1954 TOOTH EXTRACTOR William Farquhar Fraser, Armstrong, British Columbia, Canada Application December 1, 1952, Serial No. 323,456

2 Claims. 1

This invention relates to a dental instrument, and more particularly to a tooth extractor or elevator which has as its primary object to extract teeth with a minimum of pressure and effort, thus afiording a dentist greater ease and dispatch in the removal of teeth.

A further object of this invention resides in the provision of a tooth extractor which includes means for wedgedly engaging a tooth and elevating it out of its seat without cutting the gum, thus reducing trauma and ensuring a more rapid recovery of the patient.

Some of the features of the invention are the ogive-shaped blade which has herein a helical extending recess in opposition to a helically extending groove so as to form a gripping edge. It is to be noted that the groove and recess terminate in a groove extending in the reverse direction so as to ensure that the gripping edge will not contact the gum of the patient to cut the gum.

Still further objects of the invention reside in the provision of a tooth extractor that is strong, durable, highly efficient in operation, simple in construction, and which may be readily produced on a large scale for ready distribution at an inexpensive price to dentists.

These, together with the various other objects and features of the invention which will become apparent as the following description proceeds, are obtained by this tooth extractor, preferred embodiments of which have been illustrated in the accompanying drawings, by way of example only, wherein:

Figure 1 is a side elevational view of the tooth extractor comprising the present invention;

Figure 2 is another side elevational view, in an enlarged scale, showing the construction of the ogive-shaped blade;

Figure 3 is a side elevational view, similar to that as in Figure 2, but looking at the invention from a difierent direction;

Figures 4 and 5 are side elevational viewsof forms of the invention for use in forming a set of these tools when extracting the various teeth in the patients mouth, the angle formed by the blade and the shank being predetermined by the position of the tooth to be extracted;

Figure 6 is a sectional view as taken along the plane of line 6-43 in Figure 2 and showing in greatest detail the construction of the gripping edge comprising the most important feature of this present invention; and

Figure 'I is a perspective view of a portion of a patients mouth with the tool comprising the present invention in operative position.

With continuing reference to the accompanying drawings, wherein like reference numerals designate similar parts throughout the various views, reference numeral l0 generally designates a shank to which a handle I2 is secured. The handle l2 extends perpendicular to the axis of the shank l0, and is adapted to be grasped by the dentist operating on a patient using the tool. The shank I0 is provided with a portion of reduced area l4 to which the blade I6 is attached. This blade I6 is substantially ogive in shape and is provided with a helical groove l8 which terminates in a groove 20 extending in an opposed direction forming an obtuse angle with the helical groove l8.

A recess 2| as shown best in Figure 6 is formed in the ogive-shaped blade I6 and thus forms a gripping edge 22 which is adapted to seat beneath the crown of the tooth. Hence, upon the application of slight pressure and the rotation of the tool, the blade will feed inwardly and the tooth thus is lifted. The groove 20 is highly desirable since this ensures that the tool need not be rotated entirely. This prevents any of the gripping edge 22 of the blade I B from being directed at the gum of the patient. In order to properly seat under the crown of the tooth, it is necessary that this gripping edge 22 be rather sharp. Hence, if it were directed into the gum, cutting would result.

Referring now to Figures 4 and 5, it will be seen that herein there are provided tools constructed in accordance with the present invention which have shanks 3B and All respectively to which ogive- shaped blades 32 and 42 are secured respectively. These blades 32 and 42 extend at an angle so as to enable the tools to be used for the various teeth depending upon their position in the mouth of a patient.

Since from the foregoing, the construction and advantages of this tooth extractor are readily apparent, further description is believed to be unnecessary.

However, since numerous modifications will readily occur to those skilled in the art after a consideration of the foregoing specification and accompanying drawings, it is not intended to limit the invention to the precise embodiment shown and described, but all suitable modifications and equivalents may be readily resorted to which fall within the scope of the appended claims.

What is claimed as new is as follows:

1. A tooth extractor comprising a shank, an ogive-shaped blade at one end of said shank, and a substantially helical-shaped groove in said blade, said helical-shaped groove terminating in a groove extending in a differing direction.

2. A tooth extractor comprising a shank, an ogive-shaped blade at one end of said shank, and a substantially helical-shaped groove in said blade, said helical-shaped groove terminating in a groove extending in a differing direction, said blade having a recess therein forming a gripping edge, said shank having secured to its other end a handle extending substantially perpendicular to the axis of said shank.

Name Date Herrmann-Moller Apr. 19, 1938 Number

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