Improvements in Knife Cleaning Machines.
Year: 1892

page_text: Date of Application, 13th Jan., 1892
Complete Specification Left, 20th Feb., 1892-Accepted, 26th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in Knife Cleaning Machines.
I, THOMAS LONGTHORN of 44, Ripon Street, Otley Road, Bradford in the
County of York, Whitesmith, do hereby declare the nature of this invention to be
as follows:-
:-
This invention relates to improvements in that class of machines for cleaning
table knives in which rotary discs are employed and the knife or knives are
introduced between them. And the object of the invention is to provide a durable
machine of cheap and simple construction provided with more efficient means for
distributing the emery or other abradant or polishing powder.
For this purpose I preferably employ a light metal case having central bearings
for the arbor carrying the polishing discs which may be adjusted in relation to
each other and rotated in the ordinary way. Said discs may be made of hard
wood or other suitable material and have a number of radial grooves cut in their
inner faces radiating from a central hollow or depression. The inner faces of said
discs are covered with a number of segments of buff leather or other suitable
material secured by their inner edges turned in at right angles to the face and
secured in said grooves. In this manner each segment forms a more or less springy
and rounded polishing pad with channels between them to allow the polishing
powder to pass from the centre to the periphery.
The said central hollows or depressions are fed by a scoop or scoops fixed
close to the outer peripheries of the discs and communicating with the central
depressions by a passage or passages.
In machines of small diameter an opening is made in the case to allow the point
of a carving knife to pass completely through which opening also serves for
introducing the polishing powder.
Dated this 12th day of January 1892.
DRACUP & NOWELL,
Bradford, Agents.
COMPLETE SPECIFICATION.
Improvements in Knife Cleaning Machines.
I, THOMAS LONGTHORN, of 44, Ripon Street, Otley Road, Bradford in the
County of York, Whitesmith, 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 :—
This invention relates to improvements in that class of machines for cleaning
table knives in which rotary discs are employed and the knife or knives are
introduced between them. And the object of the invention is to provide a
durable machine of cheap and simple construction provided with more efficient
means for distributing the emery or other abradant or polishing powder.
For this purpose i preferably employ a light metal case having central bearings
for the arbor carrying the polishing discs which may be adjusted in relation to
each other and rotated in the ordinary way. Said discs may be made of hard
wood or other suitable material and have a number of radial grooves cut in
their inner faces radiating from a central hollow or depression. The inner faces
of said discs are covered with a number of segments of buff leather or other
suitable material secured by their inner edges turned in at right angles to the
face and secured in said grooves. In this manner the segments form a more or
Pred]
.

page_text: less springy and rounded polishing pad with channels between them to allow the
polishing powder to pass from the centre to the periphery.
To fully describe my invention reference is made to the accompanying drawing
forming a part of this Specification in which similar letters of reference indicate
corresponding parts in each of the figures.
Figure 1, is a side elevation of a knife cleaning machine constructed in
accordance with my improvements.
Figure 2, represents a diametrical section of the case with the cleaning discs
shown in full.
Figure 3, is a sectional side elevation showing the inner face of one of the
cleaning discs.
Figure 4, is a diametrical section through both the case and the discs on the
broken line a Figure 3, and
Figure 5, is a separate view of the spindle or arbor,
The metal case is formed in halves A and A' each half having a central
bearing B for the arbor C on which the discs D and D' are mounted. These discs
are preferably formed of hard wood and are secured to the metal backs d d which
are formed with keyways to fit the keys a a secured to the arbor C. The arbor C
has a collare formed solid with it and the nut F keeps such collar closely against
the inner face of A. The pressure between the two discs is regulated by means of
the nut bearing against the sleeve H which revolves with and forms the spindle
journal at that side and is pressed against the flat spring J bearing upon d. The
Ꭻ
handle K screws on to the reduced end of the spindle C. The halves A, A' of
the case are secured together by the lugs & and c. The lugsform a knife guide
for the aperture g by which the knife is inserted. The polishing powder is intro-
duced at the opening S covered. by the lid T carried by the pin t. The opening S
is so situated in relation to the aperture that the point of a long knife may project
there whilst the portion close to the handle is cleaned.
The disc D and D' have each a number of radial grooves cut in its inner face
and the turned in edges m of the leather segments L are tightly pressed and glued
in such grooves. This method of attachment makes the segmental faces L rounded
and springy and leaves radial channels between them for the polishing material.
The polishing material is lifted and passed to the centre of the discs in the usual
manner by means of a scoop O projecting from the back of the disc D which lifts
up the. polishing material from the bottom of the case as the discs are rotated and
the passage allows such material to fall to the central opening P₁ to feed the
channels radiating therefrom.
It is obvious that the machine may be made larger in diameter to adapt it to
clean more than one knife at a time.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the said is to be performed, I declare what I
claim is:
1. In a knife cleaning machine, facing the polishing discs with segmental pieces
of leather or other suitable material the edges of which are secured in radial
grooves formed in such discs, substantially as herein shown and described.
2. In a knife cleaning machine, an opening S so arranged in relation to the
knife aperture that the point of a long knife may be allowed to project there-
from, substantially as herein shown and described and for the purpose specified.
3. A knife cleaning machine having a metal case formed with central bearings
in combination with an arbor or spindle provided with a collar or shoulder to
bear against one side of the case and an adjustable sleeve forming the journal
for the other side, substantially as herein shown and described.
Dated this 19th day of February 1892.
DRACUP & NOWELL,
Bradford, Agents.