IMPROVEMENTS IN KNIFE CLEANING AND POLISHING MACHINES
Year: 1882

page_text: LETTERS PATENT to George Kent of 199 High Holborn in the County of
Middlesex for an Invention of "IMPROVEMENTS IN KNIFE CLEANING AND
POLISHING MACHINES,"
PROVISIONAL SPECIFICATION left by the said George Kent at the Office of
the Commissioners of Patents on the 8th July 1882.
GEORGE KENT of 199 High Holborn in the County of Middlesex
MENTS IN KNIFE CLEANING AND POLISHING MACHINES."
"IMPROVE-
This Invention has for its object improvements in knife cleaning and polishing
machines.
In the Specification of a former Patent granted to me No 100 in the year 1870
was described an improved handle rest for knife cleaning machines consisting of a
hollow standard projecting outwards from the casing of the machine at one end of
the slit through which the knife blade to be cleaned is thrust. The standard
carried at its outer end a roller of hard polished material for the knife handle to
rest against. There was also described the fixing a tongue shaped block or stop of
hard metal on the inside of the casing at the opposite end of the slit so as to
project inwards from the casing and form a stop for the back of the blade to rest
against.
I have found that if the roller is made of elastic material such as vulcanized
india rubber the handles of the knives get less worn than when the rollers are
made of hard polished material as described in the before mentioned Specification.
I have also found it advantageous to provide the face of the tongue shaped stop or
block against which the back of the blade has to rest with a projecting stud or
lump of vulcanized india rubber or other elastic material standing out from it for
the back of the knife handle to rest against. This keeps the handles of the knives
from being rubbed or injured just above the shoulder. In order also to prevent
the knives from being drawn into the machine when the revolving discs of the
machine are turned in the wrong direction I make the standard which carries the
roller support to project inwards a distance into the interior of the casing and
divide it by a longitudinal slit into two parts or prongs between which the knife
blade may pass the shoulder of the knife blade will come against these prongs if
the machine is turned in the wrong direction and they will therefore form a stop
to prevent the knives from being drawn into the machine.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said George Kent in the Great Seal Patent Office on the
8th January 1883.
GEORGE KENT of 199 High Holborn in the County of Middlesex
MENTS IN KNIFE CLEANING AND POLISHING MACHINES
"
"IMPROVE-
This Invention has for its object improvements in knife cleaning and polishing
machines.
In the Specification of a former Patent granted to me No 100 in the 1870
year
was described an improved handle rest for knife cleaning machines consisting a
hollow standard projecting outwards from the casing of the machine at one end of
the slit through which the .knife blade to be cleaned is thrust. The standard
carried at its outer end a roller of hard polished material for the knife handle to
rest against. There was also described the fixing a tongue shaped block or stop of
hard metal on the inside of the casing at the opposite end of the slit so as to
project inwards from the casing and form a stop for the back of the blade to rest
against.
I have found that if the roller is made of elastic material such as vulcanized
india rubber the handles of the knives get less worn than when the rollers are
made of hard polished material. as described in the before mentioned. Specification.
I have also found it advantageous to provide an elastic stop for the back of the :
knife handle to rest against. This keeps the handles of the knives from being
Fubbed or injured just above the shoulder. In order also to prevent the knives
from being drawn into the machine when the revolving discs of the machine are
turned in the wrong direction I make the standard which carries the roller support
to project inwards a distance into the interior of the casing and divide it by a
longitudinal slit into two parts or prongs between which the knife blade may
pass the shoulder of the knife blade will come against these prongs if the machine
is turned in the wrong direction and they will therefore form a stop to prevent the
knives from being drawn into the machine.
The improvements above described are illustrated in the drawing hereunto
annexed.
Figure 1 is a vertical section through part of the circumference of the casing
of a circular knife cleaning machine where a slit is formed through which the
knife blade to be cleaned is thrust in the ordinary way. This figure shews the
hollow standard prolonged so as to project inwards into the interior of. the casing
to prevent the knife being drawn inwards should the machine be turned in the
wrong direction it also shews one form of elastic stop for the back of the knife
handle to rest against. Figure 2 is a vertical section of the standard and its flange
plate by which it is secured to the wooden casing of the machine. Figure 3 is a
plan view of the same. Figure 4 is an end view of the back stop with elastic
projection for the back of the knife handle to rest against.
In these figures A is part of the circumference of the wooden casing of the
machine. B is the hollow standard projecting out from one end of the slit in the
casing and formed as above described with an inward prolongation B¹ which has
a vertical slot formed in it as shewn at Figure 2. C is the roller of elastic
material carried at the top of the standard. Preferably I make this roller of
vulcanized india rubber-the outer circumference only of this roller needs to be
made elastic the central part may be of harder rubber and have a central hole
formed through it for the pin upon which the roller is to turn to pass through.
D is the tongue shaped stop made to project inwards from the opposite end of the
slit in the casing-a circular hole is formed into the centre of the face of the stop
and into this is inserted a small block of vulcanized india rubber E of sufficient
length to project outwards from the face of the stop and come against the back

page_text: of the knife handle as shown at Figure 1. F F are brushes placed as usual at the
two sides of the slit between which the knife blade has to be thrust.
G shows a knife thrust through the slit in the casing far enough for the blade
to be cleaned right up to the shoulder. Ha portion of one of the two revolving
discs between which the knife blade is thrust and which carry brushes or cleaners
on their inner face in the usual way. If these discs are turned in the wrong
direction the knife gets turned into the position shewn by dotted lines in Figure 1
and if it were not for the inward projection B' would get drawn inwards into the
machine-the shoulder of the knife blade however comes against and is arrested by
the projection and so the knife is prevented from being drawn inwards and injury
to the machine is avoided.
Figures 5 and 6 shew another way in which the stop D may be provided with
an elastic projection to bear against the back of the knife handle in this case the
elastic projection is formed by a small roller E of vulcanized india rubber held into
a recess in the stop D by a pin passed through its centre.
Figures 7, 8 and 9 shew another way of forming the elastic projection-it is
here formed of a strip of sheet vulcanized india rubber E doubled over and inserted
into a recessed groove formed across the face of the stop. In this case the strip
of sheet india rubber may be tied into the recess by a small wire I as shown.
At Figure 10 I have shewn that the whole of the stop might be formed of a
roller of elastic material such as vulcanized india rubber-the roller is mounted
upon a pin the ends of which are carried by two arms which project inwards from
the flange plate which also carries the standard B.
In place of forming the standard B with an inward prolongation B' to prevent
the knives being drawn inwards the knives may be prevented from being drawn
inwards by preventing the revolving discs from turning in the wrong direction
in the manner shewn at Figure 11, but to this way of preventing the knives being
drawn inwards I lay no claim.
In this figure A is part of the outer casing. H a portion of the circumference
of one of the two revolving discs which carry the brushes or cleaners. K is a
roller of vulcanized india rubber upon a pin K' which can play up and down in
slots in the side arms of a small bracket L fixed to the inside of the casing. When
the disc revolves in the direction of the arrow the roller K can revolve freely but
if the disc is revolved in the opposite direction the roller gets jammed between
the disc and casing and pressing forcibly against the circumference of the disc
prevents it from turning.
Having thus described the nature of my Invention and the manner of performing
the same I would have it understood that I claim :—
First. The construction of knife cleaning machines with rollers O of elastic
material for the knife handles to rest against whilst the blades are being cleaned
substantially as described.
Second. The construction of knife cleaning machines with a stop E of elastic
material for the back of the knife handle to rest against substantially as described.
Third. The means substantially as herein described with reference to Figures 1
and 2 for preventing knives from being drawn into rotary knife cleaning
machines should the revolving discs of the machine be turned in the wrong
direction.
In witness whereof I the said George Kent have hereunto set my hand
and seal this Sixth day of January in the year of our Lord One thousand