Improvement in the Manufacture of Knife-blades.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvement in the Manufacture of Knife-blades.
I, ROBERT HERDER, Manufacturer, of Benrather-strasse, Ohligs, in the German
|Empire, do hereby declare the nature of this invention to be as follows: —
Blades for the inferior qualities of knives are usually made by stamping or
punching them out of steel plates which have not been hardened, and subse-
quently hardening and grinding the crude blades or blanks thus obtained.
This treatment of the individual blades requires a considerable amount of
labour and skilled workmen, in consequence of which the blades could not be
made sufficiently cheap.
In order to avoid this drawback, I commence by reducing the sheet-iron or
steel, or the bars serving as raw material, to the required thickness by passing
them between rollers, after which they are hardened, ground or otherwise
smoothened, and finally polished, if required.
The grinding and finishing of the entire sheet of metal can be effected easily
and cheaply by machinery.
From the sheet metal thus prepared the blades are now stamped out and sub-
sequently sharpened at the edge. no further grinding being required.
In the case of large knives with flat blades, the back of the blade may be
strengthened or stiffened by means of a narrow rail or bar fixed to the blade, or
the rear edge of the blade may be bent, so as to form a flange or stiffening rib.
Dated this 27th day of May 1899,
FAIRFAX & WETTER,
Agents for the Applicant,
Improvement in the Manufacture of Knife-blades.
I, ROBERT HERDER, Manufacturer, of Benrather-strasse, Ohligs, in the German
Empire, 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 :-
→
Blades for inferior qualities of knives are usually made by stamping or
punching them out of steel plates which have not been hardened, and subse-
quently hardening and grinding the crude blades or blanks thus obtained.
This treatment of the individual blades requires a considerable amount of
labour and skilled workmen, in consequence of which the blades could not he
made sufficiently cheap.
In order to avoid this drawback, I commence by reducing the sheet iron or
steel, or the bars serving as raw material, to the required thickness by passing
D

page_text: them between rollers, after which they are hardened, ground or otherwise
smoothened, and finally polished, if required.
The grinding and finishing of the entire sheet of metal can be effected easily
and cheaply by machinery.
From the sheet metal thus prepared the blades are now stamped out and sub-
sequently sharpened at the edge. no further grinding being required.
In the case of large knives with flat blades, the back of the blade may be
strengthened or stiffened by means of a narrow rail or bar fixed to the blade, or
the rear edge of the blade may be bent, so as to form a flange or stiffening rib.
In the accompanying drawing, Fig. 1 is a side elevation and Fig. 2 a back
view of a knife embodying my invention.
a represents the knife blade, b a stiffening rail fixed to the blade a by means
of rivets, and c the handle.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1
1. The process for the manufacture of knife blades, which consists in stamping
them from thin rolled sheet metal which has been hardened and smoothened or
polished, so as to render the subsequent hardening and polishing of the blade
unnecessary, subsequently as described.
2. The manufacture of cheap knife blades in the manner described and illus-
trated by the drawings.
Dated this 22nd day of January 1900.
FAIRFAX & WETTER,
Agents, 37 and 39, Essex Street, Strand, London.