Improvements in Grinding and Sharpening Apparatus.
Year: 1897

page_text: Date of Application, 8th July, 1897-Accepted, 21st Aug., 1897
COMPLETE SPECIFICATION.
Improvements in Grinding and Sharpening Apparatus.
I JOHANN WILHELM CARL KLEEBERG of 27 Bei dem Hühnerposten, Hamburg, in
the Empire of Germany, Barber, do hereby declare the nature of this invention.
and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
The present invention relates to improvements in grinding and sharpening
apparatus for grinding and sharpening razors, knives and other edged tools.
In grinding apparatus hitherto known and mainly consisting of two grinding
rollers revolved in opposite directions; the angle between the said two grinding
rollers, which angle determines the angle of the sloping edges of the edge tool to
be sharpened, remain always constant. All edge tools operated with such an.
apparatus or machine will therefore receive the same angular form of the cutting
edge. Apparatus of this kind are therefore particularly qualified for grinding edge
tools of the same kind or class that is to say for edge tools having the same or nearly:
the same form of the sloping edges..
..
But if there is the question to grind- knives or edge tools the cutting edges of
which are different in slope, shape and size, that is to say, have a more obtuse or
more acute angular form, it is necessary to replace the grinding rollers by substitute.
rollers having a corresponding smaller or greater diameter or to use another machine,
the grinding rollers of which are of the proper size and are applicable for the.
special case.
The object of the improvements is to provide means whereby the above mentioned
inconvenience is avoided, and which permit that one and the same grinding
machine is adapted to be used for grinding and sharpening all kinds of knives,
edge tools etc.
I attain this object by the means illustrated in the accompanying sheet of drawings
in which
Fig. 1, is a side elevation, Fig. 2, an end view and Fig. 3, a plan of the improved
grinding and sharpening apparatus; Figures 4, 5, and 6, are detailed views.
Similar numerals refer to similar parts throughout the several views.
Upon a supporting plate 2, which may be secured to a table or the like by means
of a thumb screw 1, are mounted two bearings or brackets 3 and two brackets or.
bearings 4. Between and in the bearings 4, is journalled the main shaft 5; upon
the latter is mounted an arch-piece or frame 6, capable of being turned on the said.
main shaft and provided at its free ends with suitable slots adapted to receive the
The shaft 9, of the other
journals of the shaft 8, carrying the grinding roller 7.
grinding roller 10, is lodged in and between the bearings 3.
The grinding and sharpening rollers 7 and 10, are furnished each with annular.
grooves 7*, or 10* respectively. The grooves 7*, and 10* are alternating with each
other so that the annular ribs or collars formed by the remaining portions of the one
roller may be put into the grooves of the other roller and vice-versa. By bringing
the annular portions 7, and 10, in line or contact (Fig. 4) or by putting their
alternately grooved grinding rollers partly into each other (Fig. 5) the angle.

page_text: between the said grinding rollers may be changed in order to give the tool to be
ground or sharpened the required longer or shorter sloping edges, as shown, for
instance, by the knife blades 11 or 12, respectively.
The relative position.of the grinding rollers 7 and 10, to each other is adjusted
by the following means. Between the bearings 3, is mounted a suitable traverse
or cross-bar 13 carrying a screw spindle 14, fixed to the said cross-bar so as to be
slightly movable in a vertical plane.
The other screw threaded end of the spindle 14, is passed through an oblong
slot of a lug 15, of the movable frame piece 6, and provided with a nut 16.
Between the cross-bar 13, and the lug 15, the spindle 14, is surrounded by a
suitable spiral spring 17.
- By screwing the nut 16, in one or the other direction upon the spindle 14, the
frame piece 6, is turned on the main shaft 5, accordingly, that is to say, the
grinding roller 7, is moved towards the grinding roller 10, or drawn back from
the latter respectively as will be clearly understood without further description.
The mechanism for adjusting the position of the grinding rollers may also be
replaced by any other suitable adjusting means adapted for the said purpose.
Also a movable bearing frame similar to the frame-piece 6, may be provided for the
grinding roller 10, without departing from the nature of this invention.
The grinding rollers 7 and 10 receive their rotation in opposite direction from the
main shaft 5, by means of a toothed wheel 19, upon the shaft 8, directly and a toothed
wheel 20, upon the other roller shaft 9, by means of an intervening wheel 21. The
latter is keyed on a shaft 22, mounted also in the bearings, 3.
Motion is imparted to the main shaft 5, by means of a crank wheel 23,
arranged at about an angle of 45° to the axis of the grinding rollers. Rigidly
connected with the crank wheel 23, is a bevel wheel 24, engaging a bevel wheel 25,
on the main shaft 5. The stud or pivot bolt 27, carrying the crank wheel 23, and
bevel wheel 24, is supported by a suitable bracket or block 26, mounted on the base
plate 2.
By the oblique position of the crank wheel and the grinding rollers a more
convenient position is obtained for the hands and arms of the person which uses the
said apparatus for the grinding operation.
In order to prevent the knife or tool from overturning or capsizing when the
grinding rollers revolve, suitable guides 28 (Fig. 6) may be attached to the frame
piece 6, in which guides the knife blade or tool is to be inserted.
The grinding rollers may be made of any suitable material instead of making the
grooved grinding rollers in one picce each roller may also be composed of a series
of separate grinding discs held to the proper distance apart by washers or discs of
smaller diameter.
The grinding or sharpening is effected in the following manner. The edge tool
to be ground is inserted into the guides 28, so that it rests with its cutting edge
upon the line of contact of the properly adjusted grinding rollers where upon the
latter are revolved in opposite direction by turning around the crank wheel. By
moving the said edge tool a few times to and fro between the grinding rollers, the
said edge tool will be ground or sharpened in a perfect manner, the operation
requiring only a few seconds.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A grinding and sharpening apparatus in which oppositely revolving grinding
rollers are provided with annular grooves or are composed of a series of separate
grinding discs, held the proper distance apart by suitable washers of a smaller
diameter, in such manner that one or both of the rollers, by means of movable
bearings may be put or placed more or less into each other in order to regulate
by this adjustinent the relative position of the said rollers and thereby the angle
formed by them, which angle is dependent upon the sloping.edges of the edge tool,

page_text: or the angular section of the cutting edge to be given to the latter, substantially in
and for the purpose set forth.
2. In grinding and sharpening apparatus or machines, the combination of
grinding rollers, provided with annular grooves of suitable bearings for the said
grooved grinding rollers, one or both the bearings being movable of a suitable frame
carrying the bearings of means for adjusting the relative position of the bearings
or grinding rollers respectively, and of means for rotating the grooved grinding
rollers in opposite direction, all arranged and operating as and for the purpose
specified.
Dated 8th July 1897.
For the Applicant,
WALTER A. BARLOW,
306 High Holborn, London, W.C., Consulting Engineer and Patent Expert.