Improvement in Double and Single Flange Spiral Cutters or Edges for Cropping or Shearing Machines used in connection with the Finishing of Various Textile Fabrics.
Year: 1893

page_text: Date of Application, 11th Feb., 1893
Complete Specification Left, 3rd Nov., 1893-Accepted, 30th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvement in Double and Single Flange Spiral Cutters or Edges
for Cropping or Shearing Machines used in connection with the
Finishing of Various Textile Fabrics.
I, JAMES DICKSON of Waverley Works Effingham Road, Sheffield, in the
County of York, Steel, File, and Machine Knife Manufacturer, do hereby declare
the nature of this invention to be as follows:-
My invention has for its object to provide a double flange or single flange spiral
cutter whose respective cutting sides are file cut; that is to say present a file edge
to the work, which file edge is at present confined to the bayonet form of spiral
cutter only.
The advantage I claim is a combination of the superior cutting powers of the
file edge form of bayonet spiral with the rigidity of the double edge spiral-that is
to say a spiral presenting two cutting edges with one flange or base common to
both. I propose to file cut the spiral on the reverse sides while in the flat strip
and bend the same into section, cold, on specially constructed tools or dies which
will protect the file cutting from injury during the process of manufacture. I do
not limit myself to any definite or particular method of manufacture.
Dated this Tenth day of February 1893
JAMES DICKSON.
COMPLETE SPECIFICATION.
Improvement in Double and Single Flange Spiral Cutters or Edges
for Cropping or Shearing Machines used in connection with the
Finishing of Various Textile Fabrics.
I JAMES DICKSON of Waverley Works Effingham Road, Sheffield, in the
County of York, Steel, File, and Machine Knife Manufacturer, 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 :-
My invention has for its object to produce a spiral cutter that will more
effectually execute the work for which it is intended.
It refers to either a single or double flanged spiral cutter (other than that known
as the "bayonet" shape), and it consists in providing the front or cutting sides of
the flanges of the cutter with a file cut edge, which enables the cutter to act upon
the fabric with certainty.
A. spiral cutter so formed and cut combines the superior cutting quality of the
"bayonet" form, with the rigidity and broad-base of the ordinary double spiral.
The drawings illustrate in Fig. 1, the cross-sectional form of a double flanged
cutter, and in Fig. 2, the cross section of a flanged cutter, Fig. 3-a picce of the
bar showing how it is cut or serrated.
In the manufacture of a double flanged cutter, for example, I cut or serrate (as
in a file) the flat strip of steel from which it is to be made, longitudinally on
opposite sides; the length of the serrations or cuts S, is not material, except that
they must extend to the extreme edge of the strip.
I then while cold, bend the strip so cut, into the desired cross section, consisting
of a slightly arched base B, and two flanges F, by means of tools or dies, so
constructed as not to damage the cut portions S, during the operation.
I afterwards coil the strip so bent into its spiral form, and harden and finish it
for use. I do not confine myself to the use of any particular tools, or the method
of carrying out the process of manufacture.
.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
A single, or double flanged spiral cutter, such as shown in Figs. 1 and 2, of the
drawings, (but not including the form known as " bayonet ") having one or more of
the flat sides of the flanges F, serrated or cut as a file, for the purpose specified,
and as hereinbefore described and shown in the annexed drawings.
Dated the 11th day of December 1893.
ROBT. F. DRURY,
Bank Buildings, George Street, Sheffield, Agent for Applicant.