US1821721A

US1821721A - Blade sharpener

Info

Publication number: US1821721A
Application number: US386108A
Authority: US
Inventors: David A Moyer
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-15
Filing date: 1929-08-15
Publication date: 1931-09-01
Anticipated expiration: 1948-09-01

Description

Sept '1; 1931. D. A. MQYER 1,821,721

BLADE SHARPENER Filed Aug. l5. 1929 gg u Ier.)

y mi,

Patented Sept. 1, 1931 UNITED STATES PATENT OFFICE DAVID A. MOYEB, 0F NEAR- BIRDSBGR, PENNSYLVANIA Application led August 15, 1E29.

19 ping and honing, improve the cutting edge but do not perfectly align the teeth and, consequently, do not produce as keen an edge as is desired.

It has been proposed to realign the teeth of a blade that has become dull, and thus sharpen it, by placing its edge adjacent to or in contact with the pole of a magnet or by placing t-he blade between the poles of a horseshoe magnet. The same result has also been sought by placing the edge of an already magnetized blade adjacent a piece of unmagnetized soft iron. The effect of these methods, however, is only partial alignment of the minute teeth of the blade edge.

One object of my invention is the provision of a blade sharpening device capable of sharpening a blade by the mere insertion and removal thereof from the device.

Another object of my invention is to pro vide a blade Sharpener wherein the blade is subjected both to a strong magnetic field and to the wiping action of a pair of hard true surfaces engaging one on each side of the blade edge. v 5 A further object of my invention is the provision of a blade Sharpener wherein the combined fields of two magnets are utilized to bring the minute teeth of the blade edge into alignment.

For a better understanding of my invention, refrence may now be had to the accompanying drawings, forming a part of the disclosure, wherein:

Figure 1 is a side elevational View of a preferred embodiment of my invention with a blade disposed therein in readiness for sharpening Figure 2 is a top plan View of the device shown in Figure 1 with the blade removed;

Figure 3 is a similar view with the seg- BLADE SHARPENER Serial No. 386,108.

ments separated an exaggerated distance to illustrate the normal path of the magnetic lines of force between the segments;

Figure et is a sectional view taken substantie-ily along the line i-4 of Figure 2; and

Figure 5 is an end elevational view of the device.

The embodiment of my invention illustrated in the accompanying dra-wings, broad-.i

ly considered, comprises a pair of rectangularly shaped segments 10 that are yieldingly secured together by means of a pair of tension springs 11 disposed centrally of the end portions of the two segments.

Each of the segments 10 has its ends slotted, as indicated at 12, to accommodate a spring 11, and the springs are attached to pins 13 which lie in grooves 14 cut therefor in the outer surfaces of the respective segments.

The ends of the segments are preferably beveled, as indicated at 15, to expedite assembly of the pins and springs with the segments, and are also curved, as indicated at 16, to expedite insertion of a blade between r,

the segments.

The segments l0 whichare made of iine grained tempered steel and are rhighly magnetized, constitute permanent magnets of great strength, lVhen the two segments are A further sharpening eilect is obtained by'n the continued engagement of the inner surfaces 19 of the segments with the blade as the latter is removed from the device. These surfaces are accurately machined and polished, d the central mounting of the springs 11 insures their engagement with the blade until the latter leaves the device.

To sharpen a blade, the device is preferably placed upon a table or other supporting surface in the position as shown in Figure 1 of i C the drawings. An end of the blade is first inserted between the curved portions 16 and pushed in to separate the segments, after which it may be moved to the center and into alignment with the segments without damaging the edge of the blade. Then, maint-aining the blade in alignment with the segments, it is gradually drawn up and away from the segments. As the beveled portion7 common to all razor blades adjacent the cutting edge thereof and therefore not shown, of the blade 17 is drawn from between the segments 10, the upper edges of the latter approach each other and engage the blade until it leaves the device. This action serves to wipe or burnish the edge portion of the blade and removes any loosened particles of the blade which, if permitted to remain, would cause damage to the user of the blade. Y

Thilo the blade is between the segments it has a strong unidirectional field passing through it which causes the minute teeth of its edge to move into alignment, thus sharpening the blade.

Due to the fact that the blade is a better conductor of magnetism than the air betwee the segments7 there is a concentration of lines of force at the edge of the blade as the blade is withdrawn.

Although l have illustrated only one form which my invention may assume, and have described thatform in detail, it will be apparent to those skilled in the art that the invention is not so limited but that various minor modifications may be made therein without departing from the spirit of my invention or from the scope of the appended claims.

I claim:

1. A blade sharpening device comprising a pair of similarly shaped magnets and means yieldingly maintaining the magnets in assembled relation.

2. A blade sharpening device comprising a pair of magnets yieldingly secured together.

3. A blade sharpening devi-ce comprising a pair of magnets yieldingly secured together by springs attached to the mid-points of the ends of the magnets.

4. A blade sharpening device comprisin g a pair of magnets having finished polished surfaces, means engaging the ends of the magnets to yielding maintain the magnets together with their polished surfaces in contacting relation.

5. A blade sharpening device comprising a pair of magnets each having a slot cut in each of its ends7 tension 'springs disposed in the slots, and pins attached to the ends of the springs and resting in grooves formed therefor in the surface of the magnets whereby the magnets are yieldingly maintained in assembled relation.

6. A blade sharpening device comprising` a pair of superimposed magnets formed with DAVID A. MOYER.