Year: 1888

page_text: 1, TWISDEN WILKINS of 3 Meredith Street, Clerkenwell in the County of Middlesex,
Mechanical Engineer do hereby declare the nature of this invention to be as
follows:-
It is an improvement on the rotary knife cleaning machine commonly known as
Kent's," so called because Mr. George Kent was the original inventor.
The chief advantages of my machine over those now in use are, First, That the
polishing faces of the two wheels, called "brushes," must always come into contact in
the exact centre of the "drum of the machine. Secondly, That both wheels are
moved closer together equally and simultaneously by screwing up one nut, instead
of two as is usual. Thirdly, That the wheels can be separated, equally and
simultaneously, by unscrewing this nut. Fourthly,-That an inexperienced person
cannot move the wheels out of the centre of the machine.
The improvements are in the spindle, the means of attaching the wheels to the
spindle, and the mechanism by which the wheels are moved closer together or further
apart as desired.
These improvements will be more easily explained by reference to the accompanying
sheet of drawings. Fig. 1. is a vertical section through the centre of the machine.
Fig. 2. is an end elevation of the metal work as seen from the back. Fig. 3. shows
the nut N and the screw F. The nut is in section.
The spindle S, S, of this machine may be tubular throughout its whole length as
shown in Fig. 1., or it may he tubular only at the end which is to the back of the
machine, and solid at the front end, that is, the end to which the handle for turning
the machine is fixed. Whether wholly or only in part tubular, the external diameter
of the spindle may be uniform throughout, as shown in Fig. 1. It has no shoulders
to bear against the inside of the frames or standards" G, G₁, as other machines
have, but is prevented from moving endways by shoulders on the nut N.
:
Instead of attaching the wheels to the spindle by "feathers," and pressing them
together by tubes and nuts as is usual, I fix the front wheel A. Fig. 1. rigidly to
the spindle by a pin as shown at C, or by any other suitable means.

page_text: The back wheel, B, is made to slide upon the spindle, and to revolve with it, by
the pin, d, which is driven tight into the wheel but works freely in a "slot," e, in
the spindle; the slot is long enough to allow for the wear on both "brushes." The
pin, d, also passes through a hole in the screw F, the other end of which has a screw
thread cut upon it to screw into the smaller part of the nut N. The end of the
spindle has also a thread cut upon it to screw into the larger part of the nut N. The
screw threads cut upon the screw, F, and the spindle, S, are of the same "pitch," or
fineness, but are cut in opposite directions; one thread (preferably that on tho
spindle) being "right-handed" and the other "left-handed."
To prevent the spindle from moving endways, I find the arrangement shown in the
drawings convenient, namely, one end of the nut, N, bears against the outside of
the frame or standard, G, at f, and a shoulder on the nut bears against the bracket, H,
ath. This arrangement allows the main body of the nut, N to project from the back
of the machine, giving good and convenient hold for a box spanner to be used when
putting on or taking off pressure. When the nut, N, is screwed up, (the handle K
being held to prevent the spindle from turning) the spindle S, S, and front wheel, A,
will be drawn towards the back of the machine; and, at the same time, the screw, F,
will be advanced, forcing the back wheel, B, towards the front, thus bringing the
wheels closer together. And, as the screw threads in the two parts of the nut, N,
are of the same pitch," the wheels will move through equal distances. To separate
the wheels it is only necessary to reverse the operation.
E, E, Fig. 1. are the two sides of the wooden drum, and D, D', are the top and
bottom of the rim of the drum.
The knives to be polished are put into "stays," as usual.
The drum is not shown in Fig. 2.
The polishing brushes are not shown in the drawings.
They would fill the space, J, Fig. 1., being fixed to the wheels as usual. A gap, L,
Fig. 2. is usually left in the rims of the wheels to allow a free flow of the emery
powder through the "dipper," which scoops it up from the bottom of the drum.
The use of the spaces M, M, Fig. 1., is to prevent any emery powder, which may
escape from the drum, from getting into the bearings of the spindle.
Dated this Sixth day of January 1888.

page_text: торгоѵощению
I TWISDEN WILKINS of 3 Meredith Street, Clerkenwell in the County of Middlesex,
Mechanical Engineer, 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:-—
It is an improvement on the rotary knife cleaning machine commonly known
as "Kent's."
The improvements are, Firstly, in the spindle. Secondly, in the means of
attaching the wheels to the spindle. And, Thirdly, the mechanism by means of
which the wheels are moved closer together, or further apart, as desired.
wear.
In all rotary knife cleaning machines it is necessary that the "brushes," which are
fixed to the wheels, be moved closer together from time to time to compensate for
The means usually adopted for this purpose are screws, nuts or springs. I
employ only one nut of peculiar construction. Assuming that my machine has
been properly fitted up, its chief advantages are:-First, That the polishing faces
of the two brushes must always come into contact in the exact centre of the
"drum" of the machine. Secondly, That both wheels are moved closer together
equally and simultaneously by screwing up one nut, instead of two as is usual.
Thirdly, That the wheels can be separated equally and simultaneously by unscrewing
this nut. Fourthly,-That an inexperienced person cannot move the wheels out of
the centre of the "drum."
These improvements will be more easily explained and understood by reference to
the sheet of drawings left with the provisional specification.
Fig. 1. is a vertical section through the centre of the machine.
Fig. 2. is an end clevation of the inetal work as seen from the back.
Fig. 3. shows the nut N and the screw F. The nut is in section.
The spindle of this machine may be tubular throughout its whole length as shown
in Fig. 1, or it may be tubular only at the end which is to the back of the machine,
and solid at the front end, that is, the end to which the handle for turning the
machine is fixed. I prefer to use "steam" tube, which can be bought of tube makers
ready screwed at both ends and will only need finishing by the machine maker.
The handle for turning the machine can be screwed on to the spindle and a pin put
through to fix it firmly. Should the spindles be made of solid round iron, they will
need boring up from the back end to a depth sufficient to admit the central pin F,
and the handle can be fitted on by the usual method. inch diameter round iron,
or inch "steam" tube are suitable for the smallest machines, and the other sizes
can be made in proportion. Whether wholly or only in part tubular, the external
diameter of the spindle may be uniform throughout, as shown in Fig. 1. It has no
shoulders to bear against the insides of the frames or standards G. G¹, as other
machines have, but is prevented from moving end ways by shoulders on the nut N.
Instead of attaching the wheels to the spindle by "feathers," and pressing them
together by tubes and nuts as is usual, I fix the front wheel A. Fig. 1. rigidly to
the spindle by a pin as shown at C., or by other suitable means such as a key.
23

page_text: The back wheel B is made to slide upon the spindle and to revolve with it by tho
pin d., which is driven tight into the wheel but works freely in a slot e. in the spindle;
the slot is long enough to allow for the wear on both brushes.
The pin d. also passes through a hole in the screw F., the other end of which has a
screw-thread cut upon it to screw into the smaller part of the nut N.
The end of the spindle has also a thread cut upon it to screw into the larger part
of the nut N.
The screw-thrends upon the screw F. and the spindle S are of the same "pitch"
or fineness, but are cut in opposite directions; one thread, (preferably that on the
spindle) being "right-handed and the other left-handed. To prevent the spindle
from moving end ways, I find the arrangement shown in the drawings convenient,
namely, one end of the nut N. bears against the outside of the frame or standard G.
at f, and a shoulder on the nut bears against the bracket H. at h. This arrangement
allows the main body of the nut N. to project from the back of the machine, giving
good and convenient hold for a "box spanner" to be used when putting on or taking
off pressure.
When the nut N. is screwed up, (the handle K being held to prevent the spindle
from turning) the spindle S. and front wheel A. will be drawn towards the back of
the machine, and at the same time the screw F will be advanced, forcing the back
wheel B. towards the front; thus bringing the wheels closer together. And, as the
two screw-threads in the nut N. are of the same "pitch," the wheels will be moved
through equal distances. To separate the wheels it is only necessary to reverse the
operation.
E. E Fig. 1. are the two sides of the wooden drum, and D. D' are the top and
bottom of the rim of the drum. The knives to be polished are put into "stays" as
usual. The drum is not shown in Fig. 2. The polishing brushes are not shown in
the drawings they would fill the space J. Fig. 1. being fixed to the wheels as
usual. A gap L. Fig. 2. is usually left in the rims of the wheels to allow a free flow
of the emery powder through the "dipper" which scoops it up from the bottom of
the drum. The use of the spaces M. M₁ Fig. 1. is to prevent any emery powder,
which may escape from the drum, from getting into the bearings of the spindle.
These spaces are not absolutely necessary. No description of the drum, the brushes,
or the stays is needed because they are the same as in the machines now in
common use.
"
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed, 1 declare that what
I claim is.
(1.) Tho use in a rotary knife cleaning machine of a nut, substantially as herein
described, having both a right and a left-handed thread cut within or upon it. Or
its equivalent.
(2.) The employment of shoulders or bearing surfaces on this nut, as a means to
prevent "endway" motion of the spindle of the machine when in use. Which
shoulders or bearing surfaces may be either solid with the nut or a piece or pieces
of metal fixed to it.
But I do not claim as new, forcing the brushes together simply by turning one s
screw, because I am aware that this has been done before by other mechanism.
Neither do I claim any part of the mechanism other than the peculiar nut described
above, or its equivalent.