An Improved Process or Means of Grinding Cutlery.
Year: 1889

page_text: Date of Application, 27th Apr., 1889
Complete Specification Left, 27th Jan., 1890-Accepted, 1st Mar., 190
PROVISIONAL, SPECIFICATION.
An Improved Process or Means of Grinding Cutlery.
I HENRY WILKINSON LATHAM of 27 Pall Mall in the County of Middlesex Engineer
do hereby declare the nature of this invention to be as follows:-
An improved process or means of grinding & polishing cutlery by the employment
of two or more grindstones emery wheels or other suitable abrading appliances which
I call laps acting on opposite sides of the work at the same time.
These laps in addition to the rotary or reciprocating motion necessary to produce
the cut may be moved or adjusted in any direction which the nature of the work may
require.
Work to be ground or polished may be held between the laps and moved by hand
as in working with a single lap but I prefer to employ a carriage or appliance capable
of guiding the work in the necessary direction.
When the work is irregular in shape or thickness I employ a dummy or former of
suitable shape preferably attached to the carriage to regulate & vary the thickness
between the laps and thus control the dimensions of work produced.
The positions and shapes of laps may be varied to suit different kinds of work and
they may be harder than the work and produce their own cut as grindstones and solid
emery wheels or a softer material may be used in conjunction with powdered emery
corundum or other abrading substance in the usual manner.
This invention is specially applicable to the grinding and polishing of Swords,
Sword Bayonets, Razors, Amputating Knives and other articles of cutlery requiring
to be hollow ground, but it may also be applied to the grinding of cutlery in
general.
1000
H. W. LATHAM.
COMPLETE SPECIFICATION.
An Improved Process or Means of Grinding Cutlery.
I, HENRY WILKINSON LATHAM, of 27, Pall Mall, in the County of Middlesex, 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:
The object of my invention is to effect the grinding of cutlery on both sides
simultaneously by the. employment of two or more grindstones, emery wheels, or
other suitable abrading appliances, which I call laps acting on opposite sides of the
work at the same time, and carried by suitable moveable and adjustable bearings and
framework. These laps in addition to the rotary or reciprocating motion necessary
to produce the cut may be moved or adjusted in any direction which the nature of
the work may require. Work to be ground or polished may be held between the laps
and moved by hand as in working with a single lap, but I prefer to employ a carriage
or appliance capable of grinding the work in the necessary direction.
When the work is irregular in shape or thickness I employ a dummy or former of
suitable shape preferably attached to the carriage to regulate and vary the thickness
between the laps and thus control the dimensions of the work produced.
The positions and shapes of laps may be varied to suit different kinds of work and
they may be harder than the work and produce their own cut as grindstones and solid
emery wheels or a softer material may be used in conjunction with powdered emery,
corundum or other abrading substance in the usual manner.

page_text: This invention is specially applicable to the grinding and polishing of swords,
sword bayonets, razors, amputating knives, and other articles of cutlery requiring to
be hollow ground, but it may also be applied to the grinding of cutlery in general.
The accompanying drawings shew apparatus suitable for carrying my improved
process of grinding into effect.
Fig. I. shews an end elevation partly in section of a machine for hollow grinding
on both sides simultaneously.
Fig. II. shews the side elevation and
Fig. III. the plan of the same.
The grinding wheels or laps a and b, carried by the spindles 1 and m, are brought to
bear on the article c which is carried on a slide d free to move longitudinally on the
guide bars e and f.
The spindles and m of the grinding wheels or laps a and b rotate in bearings
carried by the frames g and h. These frames are carried by swing bearings i and
and the grinding wheels or laps are thus capable of the opening and closing move-
ments necessary to suit various thicknesses of articles to be ground.
A former or dummy may be fixed to the carriage d to regulate the movements of
the swing frames g and h to suit the articles to be ground. The former or dummy
may act on the arms g and h and so open or close the grinding wheels or laps; or it
may act on wheels fixed on the spindles and m. The shape of former or dummy
used would be decided in each case by the shape of the article to be ground.
The grinding wheels are driven by a belt or belts acting on the pulleys n and o.
The carriage d is shewn in the drawings as moved by hand by means of the handle p,
but it may be moved by a rack and wheel, a screw or other means.
The necessary tendency to close on the article to be ground may be given to the
grinding wheels by the pull of the driving belt or belts or by pressure exerted by a
spring or springs or weighted levers.
Figs. IV. V. and VI. shew a machine having the grinding wheels or laps rotating
horizontally instead of vertically. The same letters denote similar parts throughout.
Fig. IV. is an end elevation partly in section, Fig. V. is a side elevation and Fig. VI.
a plan of a machine suited for fluting or grooving articles. The grinding wheels or
laps a and b are carried on the spindles and m; and these spindles are themselves
carried in bearings in the swing-frames g and has before; but these swing frames
are placed at right angles to their former positions as shewn, to bring the grinding
wheels or laps to the required horizontal plane of rotation.
The necessary opening and closing of the grinding wheels to suit the shape of the
article to be ground may, as before, be effected either by a former or dummy or by
the article itself according to the shape of the said article; and the needful tendency
of the grinding wheels or laps to close on the article to be ground may, as before,
be secured by the tension of the belt or by pressure from springs or weights; and
it will be understood that the slide d may be moved by hand or any suitable mechanical
means.
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:
grinding cutlery as described.
First. The improved process
Secondly. The machinery and apparatus for grinding cutlery as described and
illustrated.
Dated this 25th day of January 1800.