AN IMPROVED KNIFE
Year: 1880

page_text: PROVISIONAL SPECIFICATION left by the said John Hunt at the Office of
the Commissioners of Patents on the 31st July 1880.
JOHN HUNT, of Bolton, in the County of Lancaster.
CLEANER."
"AN IMPROVED KNIFE
In performing my Invention I make use of a frame or casting with open sides,
and with two or more vertical grooves in each end; in each of these grooves I place
two strips of india rubber or other yielding material, which strips extend across the
frame, and are held in position by a plate or cap which is secured by screws and
winged nuts, or otherwise, and presses the bottom strips against the base plate or
bottom of the frame; between these pairs of strips a cavity is left, which I fill with
emery or other polishing powder, and I form a hopper or opening in the plate or
cap which holds the strips of india rubber in position, through which emery is
supplied to the cavity or cavities. I place spiral springs under the winged nuts to
give an adjustable pressure to the strips of india rubber. The edges of these strips
are bevilled to allow the knife to enter readily. The knife is pushed in between
the strips of india rubber and through the cavity or cavities containing the emery,
and is thoroughly cleaned by pushing it backwards and forwards a few times. I
use a clamp or screws to fix the knife cleaner in its place.

page_text: or other yielding material, which strips extend across the frame, and are held in
position by a plate or cap, which is secured by screws or otherwise, and presses the
bottom strips against the base plate or bottom of the frame; between these pairs of
strips a cavity is left which I fill with emery or other polishing powder, and I form
a hopper or opening in the plate or cap which holds the strips of india rubber in
position, through which emery is supplied to the cavity or cavities. I place a
cover above the plate or cap and secure it to the ends of the frame by screws. I
use springs to give an adjustable pressure to the strips of india rubber. The edges
of these strips are bevilled to allow the knife to enter readily.
The knife is pushed in between the strips of india rubber and through the cavity
or cavities containing the emery, and is thoroughly cleaned by pushing it backwards
and forwards a few times.
I use a clamp or screws to fix the knife cleaner in its place.
And in order that my Invention may be fully understood and readily carried
into effect, I will describe the accompanying Sheet of Drawings, reference being
had to the figures and letters marked thereon.
Fig. 1 is a front elevation; Fig. 2 is a cross section; and Fig. 3 is a plan partly
in section of my improved knife cleaner; a is the frame made, by preference, of
one casting; b is the cover secured by the two set screws c, c; d is the presser
plate or cap by which the strips of india rubber f, g, h, and i, are held in their
places; d' is a hopper formed with the plate d, and through which emery is supplied
to the chamber formed by the india rubber strips and the frame and the plate d;
e, e, are two bow springs between the presser plate and the cover, which give an
adjustable pressure to the presser plate and india rubber; a¹ is the portion of the
frame which forms the base plate, and on its upper surface are four longitudinal
ridges to retain the india rubber strips g and i in position when a knife is being
cleaned.
On the lower surface of the plate d are longitudinal projections to retain the
strips and h in position; on each end of the frame is cast a projection a² to keep
the india rubber strips from moving endwise.
There are four holes or slots k through the base plate a¹ for the emery or other
powder that escapes to fall through on to a tray which is below the frame.
The blade of the knife to be cleaned is pushed in between the strips ƒ and g and
through the polishing powder and between the strips h and i; when the knife has
been moved backwards and forwards a few times it becomes polished.
Having stated the nature of my Invention and described the manner of
performing the same, I declare that I claim,-
1. The frame a and the slots k, as shown and described.
2. The formation of a chamber to contain polishing powder by the strips of
india-rubber and the frame and the presser plate, substantially as and for the
purpose shown and described.
3. The use of the springs e, e, for imparting an adjustable pressure to the strips
of india rubber or other material, as shown and described.
In witness whereof, I, the said John Hunt, have hereunto set my hand
and seal, this Twenty seventh day of January, One thousand eight hundred
and eighty one.
JOHN HUNT. (L.S.)