Improvements in Knife Cleaning Machines.
Year: 1898

page_text: Date of Application, 30th Sept., 1898
Complete Specification Left, 29th June, 1899 -Accepted, 5th Aug., 1899
Improvements in Knife Cleaning Machines.
We, SAMUEL BEACH COCHRANE, of 90, Geneva Road, Brixton, London, S.W.,
Engineer, and SAMUEL LEACH, of 150, Tottenham Court Road, London, Cabinet
Maker, do hereby declare the nature of this invention to be as follows:-
We use two discs of metal or other rigid material. One disc
is fastened to the driving shaft the other 19 loose upon
the shaft.
Between these discs we place two pads of any suitable material for
polishing, or we may use brushes in connection with pads fixed upon the disc or
so constructed as to revolve with them or we may use brushes only. In such
case the brushes would form part of or be fixed to disc. We employ a nut or
collar in conjunction with a spring to keep loose disc & pad in contact with the
tight disc & pad or brush. We use a crank & handle for driving, and we may
use multiplying gear to gain speed. We also use a case or guard to enclose
the disc. This shaft works in swivel bearings. We provide means for feeding
the metal polishing powder between the disc near the centre for which purpose
we provide a stoppered receptacle or pocket on the outer side of one of the discs,
said pocket having its exit on the inner side of the pad near the centre.
Dated this 30th day of September 1898.
Improvements in Knife Cleaning Machines.
We, SAMUEL BEACH COCHRANE, of 90, Geneva Road, Brixton, London, S.W.,
Engineer, and SAMUEL LEACH, of 150, Tottenham Court Road, London, Cabinet
Maker, 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;-
-
These improvements refer to knife cleaning machines in which the knife is
passed between two polishing discs mounted on a shaft one of which discs is
positively rotated by the shaft, and the other disc free to rotate by friction with
the first named disc, the object of this invention being to produce a cheap and at
the same time efficient knife cleaning machine.
On the accompanying drawing Fig. 1 is an end view, Fig. 2 a side view and
Fig. 3 a plan section of the machine. Fig. 4 is a sectional detail modification.
The positively rotated disc a is either fixed to the shaft b by a pin passed

page_text: The
The shaft
through the shaft and the boss of the disc as shewn in Fig 4 or as shewn in
Fig. 3 and as we prefer it connected thereto by a peg c and a carrier d.
other disc e is loose upon the shaft. One of the discs is bored out slightly conical
so that it can wobble on the shaft, or both may as shewn be so bored. The discs
have on their inner faces slightly projecting points f for the purpose of fixing
the pads 9 g, of felt or the like, to the discs a and e so that they cannot turn
independently of them: The discs a and e are of metal or other suitable rigid
material. Or we may use brushes in connection with the pads g; or we may
use brushes only, in which case they would form part of or be fixed to the discs.
d is a helical spring on the shaft and h is a collar (or nut) on the shaft for
keeping the pads 9 g elastically against each other and against the knife inserted
between them; i is a handle for driving; multiplying gear might be used for
increasing the speed of rotation of the shaft b but we find that the machine does
its work so well and sufficiently quickly that we can do without such gearing
for most
k is a case or guard to enclose the discs; the upper half of
purposes.
this case is hinged to the lower and is held closed by a catch for instance of the
well known form shown that is a hooked lever and a spring_m.
works in swivel bearings for the sake of cheapness in fitting up; these are simply
brass bushes having pegs o cast on which latter rest in half round recesses cast
in the lower half of the case k; the bushes are not tooled outside and rest in
recesses cast in the upper and lower halves of the case k. The lower half of the
case is made so deep as to serve for a receptacle for the used polishing powder,
the latter being thus out of reach of the discs and pads. The case is provided
with a narrow slot 2 on one side of its upper half and a wide slot q on the other
side, this latter slot being so wide that the knife can be pushed in right up to
the bolster. The foot of the case has holes so that it can be fastened to a
table by four wood screws as shown in Fig. 1. Or it may if desired be fixed by
a cramp as shown in Fig. 2. We provide means for feeding the metal polish-
ing powder between the pads near the centre for which purpose we provide a
receptacle with stopper s on the outer side of one of the discs, said pocket having
its exit on the inner side of the disc The pads do not reach quite to the shaft
so that a little space t is formed between them at this place. In Fig. 4 the discs
are shown arranged slightly different. The disc a is connected to the shaft b by
a pin which passes freely through the shaft, the disc being also bored out a
little conical, so that it can wobble. A four leaved flat spring & abutting against
a collar and against the disc e presses the two pads against each other.
By the arrangement of the discs and pads they will adapt themselves to the
wedgeshaped section of the knife and the latter will be pressed evenly over its
surfaces, and be well polished by a very few turns of the handle, with little exertion
of power and little wear on the pads.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is: -
1. The combination of two dises provided with pads or brushes on their inner
faces means for supplying polishing material thereto a shaft adapted to be rotated
and whereon the discs are so mounted that one disc is positively rotated with
the shaft and the other dise rotated by friction with the first named disc when
the machine is in operation and one or both discs being then free to wobble, a
spring to press the pads against the knife and towards each other and
enclosing divided casing wherein the shaft has its bearings the casing having
slots on two opposite sides for inserting the knife to be polished, substantially as
set forth.
an
2. The combination of a disc a or e and a stoppered receptacle r for polishing
powder arranged on the outer side of such disc, substantially as set forth.
3. The combination of discs a and e pads 9 g, space t and stoppered receptacle r
for the supply of polishing material substantially as set forth.

page_text: 4. The casing k made in two parts hinged together and provided with slots p
and substantially as set forth."
5. The casing k in combination with bearing bushes n having pegs o, the
casing having recesses to receive the said bushes and pegs, substantially as set
forth.
6. The contruction of knife cleaning machine shown on the drawing.
JENSEN & SON,
77, Chancery Lane, London, W.C.,
Patent Agents.