IMPROVEMENTS IN APPARATUS FOR TRIMMING OR FINISHING THE EDGES OF SOLES OF BOOTS OR SHOES
Year: 1880

page_text: LETTERS PATENT to William Robert Lake, of the Firm of Haseltine, Lake
and Co., Patent Agents, Southampton Buildings, London, for an Invention of
"IMPROVEMENTS IN APPARATUS FOR TRIMMING OR FINISHING THE EDGES OF
SOLES OF BOOTS OR SHOES." A communication from abroad by Oscar Lee
Grand Noble, of the United States of America.
COMPLETE SPECIFICATION filed by the said William Robert Lake at the
Office of the Commissioners of Patents on the 19th May 1880.
WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake, & Co., Patent Agents,
Southampton Buildings, London. "IMPROVEMENTS IN APPARATUS FOR TRIMMING
OR FINISHING THE EDGES OF SOLES OF BOOTS OR SHOES.". A communication from
abroad by Oscar Lee Grand Noble, of the United States of America.
This Invention relates to improvements in apparatus designed to be used in
machines for trimming the edges of soles after they are secured upon boots or
shoes.
The main feature of the said Invention is a rotary cutter provided with a series
of teeth, each tooth having a cutting edge shaped to give the desired form to the
edge of the sole, and each tooth being so formed that grinding the front face of the
tooth does not alter the shape of the cutting edge.
This improved cutter is shown detached in Figures 1, 2, 3, and 4 of the Drawing,
in which,
Figure 1 is a view of one side of the said cutter, and
Figure 2 is a view of the other side of the same.
Figure 3 is an edge view, and
Figure 4 is a perspective view drawn to an enlarged scale of a portion of the
said cutter.
The remaining Figures are hereinafter described.
Each tooth has its upper surface a formed to the shape of the cutting edge b,
this cutting edge being the apex of the angle included by the surfaces a and c;
the shape of the other surface d of the tooth is not material, so long as it does not
prevent the use of a grinding tool on the surface c of the adjacent tooth. It will
Pains £71

page_text: be observed that any point in the cutting edge is farther from the axis of the cutter
than any corresponding point in the surface a rearward of the cutting edge, so that
when the wheel revolves the cutting edge is the only part of the surface a which
strikes the edge of the sole of the boot or shoe. This cutter is sharpened by
grinding off the surface c, and can be sharpened repeatedly until the tooth becomes
too weak without altering at all the shape of the cutting edge. This form of tooth
constitutes an important feature of the said Invention, that is to say, its upper
surface a is shaped to conform to the sole edge, such upper surface being farthest
from the axis of the cutter at the edge b, and gradually decreasing in distance from
that axis to or nearly to the rear surface d of the tooth, and having a grinding
surface c to permit the tooth to be ground without altering the shape of its cutting
edge, and always leaving each point in that cutting edge farther from the axis of
the cutter than any corresponding point in the surface a.
One mode of manufacturing this cutter is as follows, that is to say-I turn
a disc of steel in a lathe so that its periphery is brought to the form described;;
then I cut out slots to form the number of teeth required, and then bend each tooth
slightly so that each point in the edge formed by the junction of the surfaces a and c
shall be farther from the axis of the cutter than the corresponding points in the rest
of the surface a.
Another mode is to cut away the surface a at the back of the edge formed by its
junction with the surface c (that is to say, at the back of the cutting edge b) by
means of a revolving milling wheel, the edge of which corresponds in shape to the
cutting edge of the cutter. This may be done before or after the slots are cut to
form the teeth.
The surface a must in one direction correspond to the shape of the edge to be
trimmed, that is to say, it has a rounding curve where the edge to be trimmed is a
hollow curve, a projecting part where that edge is cut away, and a straight part
where that edge is straight; but in the other direction, from c toward d, it may be
rounding, as shewn, or straight, or hollow.
Another feature of this Invention consists in a guard B designed to be used with
the cutter, and shown in Figure 5, which is a longitudinal section of the cutter and
one form of stock; it is also shewn in Figure 6, which represents a portion of the
said guard drawn to an enlarged scale, and in Figure 7, which is an inner side view
of the same. This guard prevents injury to the upper of the boot or shoe from the
corners of the cutter teeth.
The cutter shown has a groove across it for the reception of the rand knife D,
and the guard has two holes through it, as shown in Figure 7. This rand knife is
shown detached in Figures 8, 9, and 10; but as it is not new no further description
thereof is necessary. The cutter and guard may be used either with or without
this rand knife.
The cutter is preferably attached to a stock F, as shown in Figures 5 and 11,
Figure 11 being a transverse section on the line a, x, Figure 5. The stock F is
preferably secured to the rapidly revolving shaft G by a left handed screw, as shown
in Figure 5, but may be otherwise attached to its shaft, or the cutter may be
attached directly to the shaft; H is a sleeve backed up by a spring, so that cutters
of different width may be used on the stock F, the front edge of the sleeve being
thus always close against any cutter used, whether the cutter be wide or narrow.
The guard is held to the stock F by a left handed screw, as shown, or in any other
suitable manner; or it may be attached directly to the cutter.
Having thus fully described the said Invention, as communicated to me by my
foreign correspondent, and the manner of performing the same, I wish it understood
that I claim,
First. The cutter, constructed and operating as above described for the purpose
specified.
Second. The guard, constructed substantially as above set forth for the purpose
specified.

page_text: Third. The combination of the cutter and guard either with or without the rand-
knife, substantially as and for the purpose set forth.
In witness whereof, I, the said William Robert Lake, have hereunto set
my hand and seal, this Nineteenth day of May, in the year of our Lord
One thousand eight hundred and eighty.
W. ROB, LAKE. (L.S.)
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