US 2597525 A
Description (OCR text may contain errors)
y 1952 M. KESSLER 2,597,525
POWER-DRIVEN MANICURING DEVICE Filed June 15, 1948 672/5 /7f/6 J J4 Patented May 20, 1952 POWER DRIVEN MANICURING DEVICE Merrill Kessler, Oakland,
Calif., assignor to Aristocrat Manicuring Company, a corporation of Nevada Application June 15, 1948, Serial No. 33,077
The invention relates to devices for manicuring finger-nails and more particularly to rotary manicuring instruments which are arranged for attachment to a motor shaft for power driven operation.
An object of the invention is to provide a manicuring device of the character described which is designed and constructed for insertion under the lateral fold of skin at the side edge of a finger-nail to be manicured for rapid, safe and precise trimming the nail from the joinder of the nail and its bed or quick at the side edge of the nail uniformly and smoothly outwardly to the extended central portion of the nail.
Another object of the invention is to provide a manicuring instrument of the character described in the form of a thin rotary disc formed on one side thereof with a coating of fine abrasive particles of predetermined size to afiord proper and readily controlled cutting of a finger-nail without any accompanying burning sensation or other discomflture and which is so formed and constructed as to positively confine the cutting or abrasive action of the disc to the nail with the adjoining flesh of the finger at all times fully protected against abrasive contact or injury.
A further object of the invention is to provide in a manicuring instrument of the character described a new and improved construction for adhering abrasive particles to a metal disc.
The invention possesses other objects and features of advantage, some of which, with the foregoing, will be set forth in the following description of the preferred form of the invention which is illustrated in the drawing accompanying and forming part of the specification. It is to be understood, however, that variations in the showing made by the said drawing and description may be adopted within the scope of the invention as set forth in the claims.
Referring to said drawing:
Figure 1 is a perspective view of a manicuring device constructed in accordance with the present invention.
Figure 2 is a longitudinal cross-sectional view of the device on an enlarged scale.
Figure 3 is a fragmentary longitudinal sectional view of a part of the device on a still further enlarged scale.
The manicuring device of the present invention consists of a handle member 6 formed at one end 1 for detachable connection to an end 8 of a flexible drive 9 having an internal torsional drive element ll terminating within the end 8 in flattened tongue I 2. Journaled for rotation within the member 6 and mounted substantially axially therethrough is a shaft part l3, retained against longitudinal displacement forwardly of the handle by engaged lateral annular shoulders 2 l4 and IE on the part l3 and within the internal bearing bore of the member 6.
Preferably, the end 1 of the hand piece 6 is reduced in diameter and threaded externally for engagement with a threaded interior wall I! provided in the end 8 of the flexible drive concentric to and spaced from the drive tongue l2. The drive connection is effected by the provision in one end I8 of the shaft part 13 of a cross slot l9 opening to the end of the part for receiving the tongue I 2 and joining the tongue and part for joint rotation upon threading the hand piece 6 into the attachment 8. Preferably, and by reason of the stepped down arrangement of end IS, the external walls 2| and 22 of the end 8 and hand piece 6, contiguous to their point of attachment, are of the same diameter and provide a smooth continuous external surface for the engagement in the hand of the user. If desired and as here shown portions of the adjoining surfaces 2| and 22 may be knurled to facilitate holding.
The opposite end 23 of shaft part I3 is extended to the adjacent end 24 of the hand piece 6 and is formed with an internally threaded bore 26 for receipt of a threaded axially extended stem 21 of a manicuring instrument 28 so as to join parts 13 and 28 for joint rotation. The opposite end 29 of the member 28 is formed as an enlarged disc shaped head having a circular front face 3| arranged concentric to the axis of rotation and in a plane substantially perpendicular thereto. Desirably, the exterior surface 32 of the instrument 28 is tapered forwardly, that is toward the head 29, to a reduced neck portion 30 adjoining the rear face 33 of the head 29. Also as here shown, the forward end 34 of the hand piece 6 is likewise tapered in conformity with the taper of surface 32 whereby a continuous tapered surface is provided from the neck 30 to approximately the mid-point of the hand piece 6.
As will be best seen from Figure 3, the front face 3! of the instrument 28 is recessed slightly Within a surrounding peripheral head 35. The latter as will be seen from this figure is desirably rounded for smoothness and is reduced to a very thin cross section by tapering to the bead 35, the outer portions 31 of the rear side 33 of the disc. Desirably, the full thickness of the bead 36, as denoted by dimension a in Figure 3, is held to approximately 3 2 so as to permit the ready insertion of the disc periphery under the fingernail to be manicured and particularly under the lateral fold of skin at the edge of a finger-nail adjacent to the quick. The depth of the recess of face 3|, as denoted by dimension is in Figure 3, is preferably held to approximately and this recess is filled with abrasive particles 38 ad- 3 hered to the face 3| and extending therefrom to the front plane 39 of the bead 36. I have found for a disc of the size, and rotated at the speeds herein described, that the sizeof .theparticles 38 should be carefully held to between 0.003" .and 0.010". Particle sizes smaller than this range manifest a decided tendency to cause a burning sensation on the nail of the user. Particle sizes larger than the range indicated produce: -.too
course and too rapid cutting ofthenail taprovide a precise, smooth and.,r.e :a;d.ilyv controlled trimming of the nail. Particles held closely to 0.007" have found to produce optimum results. Emery particles are satisfactory for *present purposes.
An important feature of the present invention, is themethod of and construction. for the securing "of' the abrasive ;particles"'38 in place against the endface 3| of the disc within the recessjabove noted. 1 Insofar as I am aware, 'no.satisfactory process hasbeen developed and. available inthe art for securing .emery particles directly, :to' a metal surface. ,After a. great deal of experimentation :1 have found that the emery particles'may be secured to the end face 3|. with great cohesive force in the followingmanner. The. surface3l is preferably roughened slightlyby means of ,tool marks or the like. Thereafter, a thin and con tinuous film of. glue is spread overithe face 31 and the latter is pressedfirmly into a mass 'of emery particles so as to'securely imbed: the particles into the glue. For this purpose, I prefer to .use a cylindrical cup approximately fitting the diameter of the disc .29, deposit the emery particles in, the. base of. thecup andforce. the disc face .3! into. the cup into pressure contact with the emeryparticles. .Upon removing of the disc from the cup, or after otherwiseimbedding the,
emeryparticles in the, glue film, the faceotthe tool is carefully scraped so as to. levelthe particle layer to they front plane 39 ofthe beadlBG. The bead is wiped clean of any adhering particles and the tool set aside for drying and setting up of the glue. 1 A slow dryingoperation is preferred. While. various glues maybe used for the purpose above, I havefound that. animal glue, and particularly glue made from. animal hoofs, is entirely. satisfactory.
Of importance in obtaining proper. manicuring action of the disc is its speed of rotation. De-
sirably, the flexible driveshaft is connected to an electric motorhaving a substantial constant speed of rotation within the range'of- 500 to 2,000 R. P.'M. If possible, several speeds should be available within this-range to enable the operator to selectthe. best speed. for trimming andffinishing variousf nger-nails encountered. "The size of the disc corresponding to the indicated speed range is approximately /4 to that is the diameter taken across the front plane of the disc at the head 36.
In use the operator will initially apply the face of the disc to the side edge of. the nail adjacent the quick and at the lateral skin fold. For, proper cutting, the periphery of the disc is inserted under the edge of the nail within the lateral skin fold so as to place the front face of the disc against the edge of the nail. For this purpose the. disc must be reduced to a thinness at its periphery as above indicated and. the bead .36 and the ad.- jacent rear portion 21 of the disc should be smooth and polished and without any sharp edges so as to fully protect the adjacent flesh of the finger against which the rim andbackside of the disc are pressed. The operator then moves the face of the disc along the nail in a direction generally outwardly with regard to the nail to the .approximatelmid-point.or. center. of the nail. .The' operation is-*repeated,'starting at: the opposite side of the nail and moving across the end of the nail to its center so as to produce a general convergence of the sides of the nail to the center. In allofhthesemovements of the disc across the nail, and notwithstanding the fact that the disc is power operated, at a substantial speed, the
quick'and'fleshy. part of the finger adjoining the nail is fully protected at all times against abrasive "contact or possible injury.
. layer of abrasive particles gluedto said recessed end face andextending therefrom to-the'plane of said bead thereby providing aflatabrasive surface in the'plane of said bead.
2. A manicuring instrumentfor a rotary power drivenmanicuring device comprising, a disc having a. diameter from one-quarter inch to-onehalfinchand adapted for rotation at a speed chapproximately five hundred to two thousand revolutions per ;minute, said disc having a -recessed end face bounded by a smoothly rounded peripheral bead projecting axially therefrom by a distance of approximately one sixty-fourth of an inch, the opposite end face of said disc having afiat bevelled portion adjacent said peripheral bead to permit ready insertion of the-disc peripheryand said bead underthefinger nail-to be manicured and .for support of said-recessed end facein opposed. juxtaposition to the fingernail, and a layer'of abrasive particles'gluedto said recessed end face and extending therefrom to*the planeofsaid bead thereby providing a flat abrasive surface in the plane of saidbead.
. MERRILL KESSLER.
' REFERENCES CITED The: following references are of record. in the filev of, this patent:
UNITED STATES PATENTS Number Name Date 847,012 Korper Mar; 12, 1907 7 1,700,475 ..,Eldridge Jan. "29, 1929 1,860;629 Stevenson et-al. May'31,- 1932 2,308,624 Pouech Jan-. 19, 1943 OTHER REFERENCES Grinding Wheels, Simplified Practice Recommendation B45 39, "1939, issued'b'y The Grinding Wheel Manufacturers Association, Worcester, Massachusetts. Received Scientific .Library, U. S.-Patent-Ofllce, May 28;1940. Copy available in Scientific Libraryof US. Patent Office (T. J.
1293 (38,1939). Note page 8.
Abrasives and Grinding Wheels, a Handbook for Grinding Apprentices, Norton Co.','Worcester, Mass-., copyright'194l, copyfiled in 132/76.4= (Div. 55) Note page12.