US2597150A - Knife blade sharpener - Google Patents

Description

My 20,'1952 y J. J. KILIAN f 2,597,150

KNIFE BLADE: SHARPENER Filed June 16, 1948 2 SHEETS- SHEET 1 /lg J2 46 9' May 20, 1952 J, 1 KlLlAN 2,597,150

KNIFE BLADE SHARPENER Filed June 16, 1948 2 SHEETS-SHEET 2 Patented May 20, 1952 UNITED STATES @FFICE KNIFEBLADE SHARPENEAR JeromeJ. Kilian, Minneapolis, Minn.

lllllcatitm June 16, 194.8, SeliaIYNo, 33,363

(CIA, 51-30) 3 Claims.. 1,

This-,invention relates to grinding. machines and more Vparticularly to machines for grinding bladessuc'h as knife blades,

1t ,isan object of the invention to provide a knifesharpener or the like which includes a pair of, grinding wheel units having diagonal or frusto-conical peripheral grinding surfaces, wherein means is provided for urging the surface of one wheel into contact with the surface ofV the, other so that the two wheel units will remain in frictional contact as the peripheral grinding surfaces wear so that a drive relationship is maintained between thel peripheral surfaces at all` times.

Another object of the invention is to provide a compactly arranged and conveniently construeted power driven unit of the type mentioned above.,-

further object of the invention is to provide a knife Sharpener including grinding wheels which are adapted to be run in oil and also to provide efficient means for encasing the wheels.

The above and other objects and advantages of, theinvention will more fully appear from the following description made in connection with the accompanying drawings, wherein like reference,` characters refer to the same parts throughout the views, and, in which:

Figure 1 is a front elevational view with a part of the casingbroken away;

Figurer 2 is a side elevational view with a part of the casingY broken away;

Figure, is a top plan view;

Figure 4. is a perspective view ofthe cup in which;v the shiftable support for oneof thegrind.- ing wheel' spindles is mounted;

Figure 5 is a longitudinal vertical sectional view through the shiftable spindle support;

Figurel 6 is an enlarged sectional view through the combinedY oil guard and wiper;

Figure 7 is an enlarged horizontal sectional View through. the grinding wheel units and their mountings;

Figurel is an enlarged section takenL approx; iinately on theline 8-.8 of` Figure '7;

Figure 9 isan enlarged section taken approximately on the line 9-9 of Figure 7;

Figure 10 is an enlarged section taken approximately on the line I U-Iil of Figure '7;

Figure 11 is an enlarged section'taken approximately on the line I I-II of Figure 7; and

Figure 12 is an enlarged` section taken approximately on the line I2-I2 of Figure 7.

The Vapparatus includes ak casing I3 supported by legs I4` and havinga pan I5 in its upper por- Y The pan I5.has a wall portion I6Y shown inthe lower left corner of Figure 7 which supports. a bearing memberl Il by means of attachment bolts I8v as shown in Figure 11. Mountedin the bearing member-Il is a bearing sleeve I9 which is held by a set screw shown in Figures 'l and 11. Rotatably in the bearing sleeve I9 is a spindle 2l which has a pulley 22 on its outer end as shown in Figure '7. Referring toFigure 1, the pulley 22 is connected by means of a belt 23. toa pulley 24 on a cross shaft 25 in the lower part of the casing I3, The cross shaft 25 is supportedI by a motor 26 to which it is connected by a belt 21 as shown inFigure 1.

The spindle 2| extends intoy the pan I5v and hasv a cup 28 mounted thereon. The cup 28 is connected to the spindle 2l by means, of a set screw 29 whose inner end lies in a keyway 30- in the spindle. The cup. 28 has a grinding wheel 3| mounted thereon, said grinding wheel having a sleeve 32 which isY fitted to thecup 28. A retaining disc 33, of larger diameter than the cup 28 is connected tothecup by a short bolt 34 and overlies a part ofthe grinding wheel 3| to holdit on the cup.

The spindle2 I has an internally threaded` bore unit 35 which contains a threaded stem 36 adapted to bear against the inner bottom portion of the cup 28 to limit the inward position of the grinding wheel 3| on` the spindle 2I.

At the right hand sideV of the, pan I5 is mounted a bearing cap y3'! which isy cylindrical and into this is fitted a cupv 38. A cup shaped` spindle support 3Q is slidable into the cup 38v as shown. in Figure '7, the bottoms of the cupsY being in opposed relationship and a compression spring 40 being located in the two cups and pressed against the inner bottom portion of each. A set screw il is threaded through the wall of the cup 38 and its inner endrides in a keyway 412r in the.. cup:- shaped spindle support 39,:

The cup 38 is keyed to the. bearing cap 3l by means of a key 43 shown in` Figure 12 sothat the cup 3S and the cup-shaped spindle support 39. cannot rotate relativeto the bearing cap 31.

The cup-shaped spindle support 39 has a di.- agonal opening 38a through one end thereof as shown in Figure '7. Relatively tightly tted. in the opening 39a is a spindle 44 which, supports a pair of cooperating grinding wheely elements 45 and 46, in theA following manner..

'I'he grinding wheel element 46 has a bushing 4l lining its central aperture. This bushing is rotatable on a sleeve 48 which is in turn rotatable on the spindle 44. A set screw 49 is threaded through the sleeve 48 and its inner end rides in a circumferential groove 50 approximately midway of the ends of the spindle 44.

The grinding wheel element 45 is provided with bushings 5I and 52, the inner bushing 52 being iitted on the end of the sleeve 48. A disk 53 is held against the outer face of the bushing 5| by means of a bolt 54 which connects said grinding wheel element to the sleeve 48. 'I'he grinding wheel element 45 is free to rotate relative to the spindle but cannot move longitudinally thereof since it is connected to the sleeve 48 and the sleeve is connected to the spindle by the set screw 49.

When the wheel 3| is rotated by means of its drive connection with the motor 26, this wheel is arranged to rotate the wheel sections 45 and 4G Yby means of a frictional drive relationship. 'The wheel 3l has a frusto-conical peripheral surface 3in1. and the wheel sections 45 and 45 have complementary frusto-conical peripheral sur- , faces 45a and 46a. As the device is shown in the drawings the spindles 2 I and 44 lie at right angles to each other and on a common plane. The frusto-conical surfaces of the grinding stones are such that the lines disposed transversely of those surfaces from one face of the stone to the other are approximately 45 to the rotational axis of the stones as illustrated in Figure 7. The angle of the spindle 44 to its longitudinal slidable and spring pressed cup-shaped support 3B is such that asv tbe peripheral surfaces of the wheels wear, thereby reducing the diameters of the wheels, the spring 40 will keep the peripheral surfaces of the two wheel units in contact. Rotation of the wheels is in a direction indicated by the arrows in Figure 1.

With grinding wheels mounted in the manner shown and described there is an automatic adjustment for wear and the right hand wheel units 45 and 46 will be pressed toward the wheel 3l in a direction along a line normal to a transverse line across the frusto-conical surface Sla on the wheel 3l where the two stone assemblies contact each other. The two stone units 45 and 46 are arranged for free rotation relative to each other since this has been found to greatly facilitate maintaining of the peripheral surfaces of the wheels on the true circles and to prevent them from `becoming bumpy.

In Figure 6 there is shown a grinding wheel wiper which includes a casting 55 shown in Figures l, 3, 6 and '7. This casting has a recess 56 therein as shown in Figure 6. Extending into the recess is a metal tongue 51. Inserted into the recess between the tongue 51 and the upper inner portion of the casting 55 is a tongue 58 of fairly iiexible material such as a piece of ber. A set screw 59 is threaded through the casting 55 to permit pressure to be placed on the tongue 51 to increase or decrease the pressure of the tongue against the fiber wiper 58. As illustrated in Figures 3 and 6, the wiper 58 is adapted to bear against adjacent corners of the grinding wheel 3l and the wheel units 45 and 46. The wheels are adapted to be run in oil which is placed in the pan l5. This oil prevents the stones from becoming glazed and produces a better sharpening action.

In order to prevent splattering of the oil, the pan I5 and wheel units 3|, 45 and 46 are nearly entirely covered by shields 60 and 6l which have curved cut out portions 62 and which are spaced as at 63 so that the bight formed by the grinding wheels is rendered accessible to a knife blade.

The wheels are rotated and the blade is placed in the bight above mentioned and the wheels turned upwardly toward the blade edge, sharpening it on both sides at once. The blade is turned longitudinally backward and Vforward during the sharpening operation.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the various parts without departing from the scope of my invention.'

What I claim is 1. A knife Sharpener comprising a wheel spindle supporting structure, a pair of wheel spindles having supporting portions mounted on said supporting structure and having wheel mounting portions extendingoutwardly from said supporting structure in converging relation oneV to the other, the wheel mounting portion of one of said spindles being disposed at less than a straight angle relative to the supporting portion thereof, a pair of beveled grinding Wheels respectively mounted on the wheel mounting portions of said spindles and adapted to tangentially engage one another to define a line of contact therebetween, the supporting portion of the spindle having the wheel mounting and supporting portions thereof disposed at less than a straight angle being axially shiftable on its support along a line normal to a plane disposed tangent to both of said driving wheels through their line of contact.

2. A knife Sharpener comprising a pair of rotary grinding wheels having cooperating beveled peripheral grinding surfaces, a spindle support for each of said grinding wheels, a pair of wheel mounting spindles each having a supporting portion and a wheel mounting portion and respectively carrying said wheels on the wheel mounting portions thereof, the supporting portion of one of said spindles being held against rectilinear movement to facilitate driving thereof and the wheel mounted thereon being xed thereto to be driven thereby, the other spindle having the wheel mounting and supporting portions disposed at less than a straight angle and having the supporting portion axially shiftable on its support along a line disposed normal to the plane lying tangent to said two grinding wheels through their line of contact, said two grinding wheels tangentially engaging one another to dene a line of contact therebetween when said shiftable spindle is urged toward the other grinding wheel, and resilient means for urging said shiftable spindle toward said other grinding wheel.

3. A knife Sharpener comprising a Wheel spindle supporting structure, a pair of wheel spindles having a wheel mounting portion and a supporting portion with the supporting portions thereof respectively mounted on spaced portions of said supporting structure and having their wheel mounting portions disposed in outstanding converging relation, the wheel mounting portion of one of said spindles being disposed at deg. relative to the supporting portion to define a bend therein, a pair of rotary grinding wheels having the grinding surfaces thereof beveled at 45 degrees to the axis of rotation thereof, said wheels being respectively mounted on the wheel mounting portions of said spindles and adapted to tangentially engage one another to define a line of contact therebetween, the wheel mounting portions of said spindles being disposed at right angles one to the other, the supporting portion of the bent spindle being axially shiftable on the supporting structure and the line of shifting movement being disposed normally of a plane through the line of contact between said grinding wheels tangentially thereof, and resilient means for urging said spindle toward said plane to maintain Contact between said Wheels during the grinding operation.

JEROME J. KILIAN.

REFERENCES CITED The following references are of record in the iile of this patent:

10 Number 6 UNITED STATES PATENTS Name Date Hyatt et al Feb. 19, 1861 Millsap June 24, 1930 Harrison et al Sept. 11, 1934 Schulze Apr. 4, 1939 Kilian Nov. 14, 1944 FOREIGN PATENTS Country Date Sweden May 4, 1916

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