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Title:
Nail file construction
United States Patent 2233438
Abstract:
My invention relates to a file construction, and more particularly to such a construction for shaping finger nails. It is an object of my invention to provide a file construction for filing and shaping the free end of a finger nail without sharp edges and convex in cross-section instead of...


Inventors:
Henry, Troya
Publication Date:
03/04/1941
Assignee:
Henry, Troya
Primary Class:
International Classes:
A45D29/04
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Description:

My invention relates to a file construction, and more particularly to such a construction for shaping finger nails.

It is an object of my invention to provide a file construction for filing and shaping the free end of a finger nail without sharp edges and convex in cross-section instead of flat, thus eliminating the necessity of using an emery board or other auxiliary device after the filing action to make the nail edge convex in cross-section.

In the use of the conventional nail file, in which the filing surface is a plane surface, the teeth, burs or abrasive particles provided upon the filing surface are apt to file the finger or to slip on the nail edge so that its edge cuts the finger adjacent the nail. It is an object of my invention to provide a file construction of the class described, so formed as to eliminate all possibility of the finger adjacent or beneath the nail being abraded during the filing action, or cut by the slipping of the file on the nail edge.

In the use of the conventional flat file it is necessary that the angular relationship of the finger and the longitudinal axis of the file be continually changed as the file is drawn across the nail, in order to prevent the edge of the nail being filed into a fiat outline as contrasted with a curved outline. It is an object of my invention to eliminate this necessity by providing a file construction so shaped that as it is drawn across the nail, the angular relation of the finger and the longitudinal axis of the file being fixed, different portions of the curved edge of the nail are subjected to equal filing actions. " Another object of my invention is to provide a file construction so shaped that for a nail having a free edge of a given degree of curvature, a substantial portion, in some cases amounting to approximately one-half of the free edge of the nail, may be uniformly filed throughout its extent by drawing the file across the edge of the nail while maintaining constant the angular relationship of the finger and the longitudinal axis of the file.

Further objects and advantages of my invention will be made evident in the following specification, which may be better understood with reference to the accompanying drawing, in whichFig. 1 is an elevational view of one embodiment of my invention; Fig. 2 is a plan view of the embodiment illustrated in Fig. 1; Fig. 3 is a sectional view of a modified embodiment of my invention, illustrating its use; Fig. 4 is an enlarged sectional view taken as indicated by the line 4-4 in Fig. 2.

Referring to the drawing, which is for illustrative purposes only, the numeral I I indicates a file body which may be suitably secured in any desired handle 12. As is illustrated in Figs. 2 and 4, the file body II is curved or concave in cross-section transversely of the file body, providing a concave surface 13.

The concave surface 13 is provided with an abrasive or filing means, comprising teeth or burs integral with the file body II or abrasive particles such, for example, as particles of carborundum, emery, glass or the like, of suitable size and shape secured thereto, forming thereon an abrasive or filing surface 14. This abrasive surface 14 is not exposed on the free edges of the file body II.

As illustrated in Figs. 1 and 2, the file II may be curved longitudinally to provide one concavity 15 and one convexity 16. If the line indicated by the numeral 17 of Fig. 1, which is drawn midway between the convex and concave portions of the filing surface 14 be regarded as the longitudinal axis of this surface and parallel to the longitudinal axis of the file body I , it will be seen that the filing surface 14 includes portions sloped in opposite directions relative to this axis.

The concavity of the surface 13 is tapered adjacent the free end of the file 11 to provide a flattened end portion 18 of substantially the same thickness as the body 11, and the width of the file body II is diminished to make the end portion 18 pointed. The teeth, burs or abrasive particles are removed from this end portion 18 to provide a smooth surface thereon, indicated by the numeral 19 of Fig. 2.

In use the finger may be held stationary at an angle with the longitudinal axis of the file body 1I, with the edge of the nail in contact with the abrasive or filing surface 14, and the filing surface 14 is drawn along the nail edge. The file may be reciprocated parallel to the longitudinal axis 17, with the finger so angularly positioned relative to the longitudinal axis 17 that the portion of the concavity 15 of the file body II nearest to the handle 12, indicated by the numeral 20, will contact the edge of the nail adjacent the side of the nail. As the file body 1 is drawn across the nail, this portion of the nail edge will be filed or abraded. The angular relation of the finger and file body II remains fixed as the file is moved until that portion of the concavity 15 being more distant from the handle 12, as indicated by the numeral 21, comes in contact with and files the curved edge of the nail nearer to the center of the nail. As the travel of the file body II is continued and that portion of the file body II between the concavity 15 and the pointed end 18 contacts the edge of the nail, it will be seen that the portion of this curved edge which is contacted and therefore filed and abraded is again the portion near the side of the nail.

Thus, as the file is drawn across the edge of the nail, while the angular relation of the finger and file body I I remains constant, the portion of the nail edge being subjected to the filing action is constantly changing, with the result that a substantial portion of the curved nail edge 13 Is subjected to a filing action with each stroke of the file and each increment of this curved portion of the nail edge is subjected to an equal filing action.

The extent of the curved portion of the nail *3 edge subjected to the filing action by one stroke of the file body across the nail edge, under the conditions described, is dependent upon the degrdes of curvature of the concavity 15 and convexity 16 of the file body I I and the filing or 5 abrasive surface 14.

As the file body II travels across the edge of the nail, in the manner described, a free edge of the file body extends between the nail and the finger. This free edge, indicated by the .3 numeral 22 of Fig. 4, is not covered by the abrasive surface 14 and Is smooth. Therefore, the finger which it engages is subjected to no filing action and all possibility of injuring the finger by filing it is eliminated. Furthermore, the reL5 ception of this free edge 22 between the nail and the finger guides the file body II and prevents it from slipping from the nail edge against the finger in a manner to injure the finger.

The curvature of the abrasive or filing surface 43 14 which contacts the nail edge, insures that the nail will be cut or filed so that it is convex in cross-section, thus preventing the formation of any sharp edge on the nail during the filing action.

4 In Fg. 3 I have shown a file body 23 of construction similar to that of the file body I , previously described, except that it is provided with a plurality of concavities 24 and convexities 25 of a greater degree of curvature than the conc3 cavities and convexities 15 and 16, previously described. Like the file body I , the file body 23 is provided with a handle 26 at one end, and has an abrasive or filing surface 27 thereon.

If the finger, indicated by the numeral 28, 53 be held in fixed angular relation with the longitudinal axis of the file body 23 and handle 26, and the abrasive or filing surface 27 be drawn across the nail edge, it will be seen that when the nail is in contact with that portion of the " filing surface which slopes upwardly, as shown in Fig. 3, a portion 29 of the nail edge adjacent its middle is subjected to a filing action; and as the nail edge contacts the filing surface, illustrated in Fig. 3 as sloping downwardly, a c5 portion 30 of the nail edge is subjected to the filing action. Thus, if desired, the abrasive or filing surface may be so formed, that approximately one-half of the free edge of the nail is subjected to the filing action during one stroke of the file body 23 across the nail.

The file body 23 may be provided with a pointed smooth end 21 like the end 18 of the file body II previously described. The pointed ends 18 and 31 may be employed to remove any foreign matter from between the nail and the finger, the absence of abrasives or filing surfaces upon these pointed ends 18 and 31 eliminating any possibility of filing the finger during this operation.

While in the embodiments of my file construction illustrated and described, I have shown the convexities and concavities as having regular degrees of curvature, the file body may be formed, with the filing surfaces sloping in opposite directions having different degrees of curvature to accommodate different shapes of nail edges. For example, the filing surface illustrated in Fig. 3 as sloping upwardly may be made with considerably greater degree of curvature than the filing surface illustrated in Fig. 3 as sloping downwardly. Likewise, if desired, the abrasive surface 14 may be eliminated upon that portion of the concave surface 13 immediately adjacent the free edges thereof.

While those embodiments of my invention illustrated in the accompanying drawing, are fully capable of performing the objects and providing the advantages primarily stated, there are various embodiments likewise capable of performing these objects and providing these advantages, including, but not restricted to those just described, and I therefore wish my invention to be understood as not restricted to those specific embodiments shown and described therein.

I claim as my invention: 1. In a finger nail file, a combination of: a file body; and abrasive means on a surface thereof, said surface comprising a longitudinally directed concavity and a longitudinally directed convexity.

2. In a finger nail file, the combination of: a file body; and abrasive means on one surface thereof, said surface being curved to provide a plurality of concavities longitudinally directed therein and a convexity connecting adjacent concavities. 3. As an article of manufacture, a file body having filing means on a surface thereof, said surface being concave in transverse cross-section and curved longitudinally to provide a plurality of concavities and a convexity connecting adjacent concavities.

4. As an article of manufacture, a file body having filing means on a surface thereof, said surface being concave in transverse cross-section to adjacent one end of said body and curved longitudinally to provide a plurality of concavities and a convexity connecting adjacent concavities, said surface being flattened and said body being pointed at said one end thereof. HENRY TROYA.