Improved Means of Sharpening Tools.
Year: 1897

page_text: губили пагретng 10018.
I, EDMUND JOHN PASSINGHAM, of 56, Clarence Square, Brighton, in the County
of Sussex, Photographer, do hereby declare the nature of this invention to be
as follows:--
My invention relates to improved means of sharpening chisels, planes, and
other cutting tools or instruments, and has for object to enable a much truer,
straighter, and sharper cutting edge to be obtained than by an ordinary hone.
The invention consists in the employment of a set of sharpening surfaces or
"hones" made of cast iron and whose surfaces are ground together with emery
powder and mineral oil or other suitable vehicle whereby the surfaces are con-
stantly maintained truly plane instead of being allowed to wear hollow as does
an ordinary hone at the same time that the emery itself is ground to progressive
degrees of fineness so as to afford a progressively finer sharpening medium for
producing a true and keen cutting edge on the tool.
The set of so-called hones may be two, three, or more in number each planed
or milled on the face and provided with a handle at back whereby the one may
be moved over the upturned face of the other with a circular grinding motion so
as to produce and maintain a truly plane surface and at same time grind the
enery to a progressive degree of fineness, the hones when in position for use being
fitted face uppermost in corresponding seats in a base board, the tool being
sharpened on the several hones in succession.
Dated thin 95th
100%
A. M. & WM., CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.
Improved Means of Sharpening Tools.
I, EDMUND JOHN PASSINGHAM, of 56, Clarence Square, Brighton, in the County
of Sussex, Photographer, do hereby declare the nature of this invention and in
what manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
My invention relates to improved means of sharpening chisels, plane irons,
razors, and other similar cutting tools or instruments and has for object to enable
the defect of ordinary hones, that they are liable to wear hollow, to be avoided
and to enable a much truer and straighter cutting edge to be obtained than by
an ordinary hone.
The invention consists in the employment of a set of sharpening surfaces which
Price 8d1

page_text: may be designated as "hones" but are made of cast iron, planed or milled upon
the working face, one or more of the set of "hones" being adapted to be ground
upon the other, or others, with emery powder and mineral oil or other thin
vehicle whereby the surfaces of the "hones" are maintained constantly plane
at the same time that the emery applied to the said surfaces is ground to such
degrees of fineness that the succession of sharpening surfaces will form progres-
sively finer sharpening media for producing a true and keen cutting edge on
the tool.
The invention is illustrated in the accompanying drawings forming part of
this specification wherein Figure 1 represents a set of three "hones" and Figure 2
is a cross-section of one of them.
The set of so-called "hones" may be two, three, or more in number, three being
preferred as indicated by the letters A, B, C. They are castings each of the
form shewn provided with ears f at the ends for screwing to a backing or base E,
the first one A of the set being attached to a backing D adapted to form a handle
whereby the "hone" A. may be held with its acting face a applied upon the
acting face b or c of either of the others so as to enable it to be moved over the
same with a circular grinding motion in order to produce and maintain truly
plane surfaces on both of them and at same time grind the emery which is applied
to said surfaces to a proper degree of fineness. The "hones when in position
for use for sharpening purposes are fitted face uppermost upon the base board E,
the backing D of the first "hone" A being removably fitted or secured to the
base board whilst the "hones" B and C are directly fixed thereto by their ears f.
The surfaces of the "hones" having been ground together as above described
and the emery having been likewise ground at same time so that it presents three
progressive degrees of coarseness, the tool is sharpened in the usual way by
applying it to the surfaces of the hones A, B, C, in succession, the grinding of the
hones" being repeated as often as is necessary to maintain an efficient surface.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
"6
I claim is
The herein described means of sharpening edge tools consisting of a set of two,
three, or more cast iron "hones" adapted to be ground together in combination
with emery powder suspended in mineral oil or other thin vehicle, and ground
"
hones as
to progressive degrees of fineness by the grinding together of the
described.
66
COCTIOTE
Dated this 25th day of February 1898.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.