IMPROVEMENTS IN MACHINES FOR CLEANING AND POLISHING TABLE KNIVES
Year: 1884

page_text: I JOHN PINCHBECK of N° 9 Victoria Chambers Victoria St in the County of
Middlesex Civil Engineer do hereby declare the nature of my Invention for
IMPROVEMENTS IN MACHINES FOR CLEANING AND POLISHING TABLE KNIVES to be
as follows:-
In carrying out this Invention I employ certain parts of a machine for which
I obtained Provisional Protection dated July 2d 1880 and numbered 2707, and the
employment of these parts viz a bed of wood, C springs, roller, pad and emery
hopper form no part of the present invention which relates to an improved
construction of pad, roller together with a method of lifting the roller from the said
pad to enable the shanks and backs of the knives to be polished without subjecting
the pad to unnecessary wear-In the construction of the rollér I form it by
threading a series of discs or washers upon a spindle between two iron washers.
The discs are punched out of buff or other leather in sheets the object of the iron
washers being twofold.. 1st to maintain the leather dises in their true position and
2nd that their peripheries may bear upon the hard wood of which the pad is
constructed and prevent the wearing away of the roller upon the pad. The pad
itself is of a peculiar construction, hard wood or box wood being prefered The
wood is cut in narrow strips about of an inch wide and these are threaded upon
two or more steel tempered wires which allow them to adjust themselves to the
curve of the blade to be polished while at the same time it exposes a hard surface
upon which the blade of the knife travels so that a perfectly hard and at the same
time pliable pad is thereby obtained The Third improvement consists in the
employment of a wooden roller resting upon the pad at the back of the polishing
roller to cause sufficient friction on the pad and counteract the tendency of the
polishing roller to draw the blade into the machine at too rapid a rate and thereby
to prevent it being properly polished-The spindle which carries the wooden roller
is fitted with a pair of cams which act upon the C springs and causes them to
widen when turned up and so lift the polishing roller off the surface of the pad
during the polishing of the backs and shanks of the knives The carriages which
carry this spindle pass through the bed plate which is of iron and they are
provided with india rubber washers to allow a certain amount of elasticity and
allow the wood roller to adjust itself to the various thicknesses of the blades.
The spindle which carries the cleaning roller is prolongued to carry on its end a
small leather roller to clean the shanks and backs of the knives.
"

page_text: I JOHN PINCHBECK of 9 Victoria Chambers, Victoria Street in the County of
Middlesex, Civil Engineer do hereby declare the nature of my Invention for
IMPROVEMENTS IN MACHINES FOR CLEANING AND POLISHING TABLE KNIVES and in
what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
In carrying out this invention I employ certain parts of a machine for which
I obtained Provisional Protection dated July 2d 1880 Number 2707 and the
employment of these parts viz a bed plate of wood, C springs, roller and pad and
emery hopper form no part of the present Invention which relates to an improved
construction of pad & roller together with a method of lifting the roller from the
said pad to enable the shanks and backs of the knives to be cleaned without
subjecting the pad to unnecessary wear. In the construction of roller I form it by
threading a series of discs or washers upon a spindle between two iron washers.
These discs are punched out of buff or other leather in sheets, the object of the iron
washers is twofold, to maintain the leather discs in their true position, and also
that their peripheries may bear upon the hard wood of which the pad is
constructed, and prevent the wearing away of the roller upon the pad. The pad
itself is of peculiar construction, hard or boxwood being preferred The wood is
cut in narrow strips about 1 inch wide, and these are threaded upon two or more
steel tempered wires which allow them to adjust themselves to the curve of the
blade to be polished, while at the same time it exposes a hard surface upon which
the blade travels, so that a perfectly hard and at the same time pliable pad is
obtained. The third improvement consists in the employment of a wooden roller
resting upon the pad at the back of the polishing roller, to cause sufficient friction
on the pad and counteract the tendency of the polishing roller to draw the blade
into the machine at too rapid a rate, thereby preventing it being properly polished.
The spindle which carries this wooden roller is fitted with a pair of cams which
act upon the C springs, and causes them to widen when turned up, and so lift the
polishing roller off the surface of the pad during the cleaning of the backs & shanks
of the knives. The carriages which carry this spindle pass through the bed plate
which is of iron and they are provided with india rubber washers to allow a
certain amount of elasticity and enable the wood roller to adjust itself to the
various thicknesses of the blades to be polished. The spindle which carries the
polishing roller, is prolonged and carries a small leather roller to clean the backs &
shanks of the knives.
In order clearly to describe my invention I proceed to make it clear by the aid
of the accompanying drawing Fig 1 is a plan with one half of emery hopper
removed. Fig 2 is a section, Figs 8 & 4 details of the pad, Figs 5 & 6 shew a
modification of the lifting apparatus. And first as regards Figs 1 & 2 A is the
bedplate BB the springs. C the polishing roller, D the emery hopper, E the
pad, F the india rubber cushion, G the spindle carrying the roller, H the handle
for working same I the friction roller, J the spindle to carry same, K K the cams

page_text: to lift polishing roller, L L the carriages, M handle to work cams, N the knife
blade, O india rubber washer to give elasticity to cams. Figs 5 & 6 show a
modification of the lifting apparatus. in this case the cams, carriages and small
friction roller, are dispensed with, and a cross bar Q substituted which is held to
the bed by the screws R, R. A second cross bar S S is fixed to the springs by
screws T T. by turning the screw U by means of the lever V the polishing roller is
raised from the pad.
Figs 3 & 4 show the pad composed of diagonal strips of wood or metal such as
lead tin & P, P, P being the tempered steel wires which hold them together. . The
diagonal direction being to prevent a parrallel line being drawn on the knife as it
passes over them.
In liew of the small friction roller I before described I substitute a piece of buff
leather W which is held down by a brass plate X acted upon by springs Y which
in their turn are held down by the screws Z the amount of friction being regulated
by the nuts upon them-The discs of polishing roller are held together by means
of rivets a, a, a, Fig 6.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that
what I claim is
1 The peculiar construction of a wood or metal pad having a hard surface and
pliable as described.
2 The construction of a polishing roller built up of discs of leather whereby only
the cross grain is exposed to wear and which are held together by rivets or screws
as described.
3 The lifting apparatus to release the polishing roller from contact with the pad
as described.
4 The combination of the various parts above described to effect the polishing of
knives for domestic purposes.