Improvements in the Production of Compound Steel Bars for Making Cutting Tools and the like.
Year: 1897

page_text: Improvements in the Production of Compound Steel Bars for
Making Cutting Tools and the like.
We, JOSEPH BEDFORD, of Haymarket Chambers, in the City of Sheffield, Steel
Merchant, and JOSEPH ASHTON, of 18, Thoresby Road, also in Sheffield, Engineer,
do hereby declare the nature of this invention to be as follows
―
Our invention relates to the production of bars composed of a superior quality of
cast steel enclosed or partially surrounded by a greater body of a cheaper steel or iron
to give the requisite support and firmness to the higher grade steel when put into
use as a tool. The principal object is to provide a tool of maximum grade or
quality at a minimum cost of material and labour.
In carrying out our invention we make from the requisite quality of cast steel.
a comparatively small bar of any desired shape or section which may be square
round flat or trapeze form with or without grooves hollows or cavities formed upon
its sides: Likewise from a relatively inferior quality of tough steel or iron we
produce a larger bar of say square or flat section and sink in one of its sides
corners or edges a groove or recess of suitable size and shape to receive the bar of
cast steel which last mentioned bar being placed within the groove while the
larger piece is still hot we proceed to finish the bar by pressure of rolls or by
hammering in manner ordinarily practised for tool bars.
The compound bar so produced is then ready for cutting up and may be
fashioned and tempered suitably for the class of work required to be done.
ISAAC BECK, F.S.P.A.,
Haymarket Chambers, 17, Haymarket, Sheffield, .
Agent for the Applicants.
5 Improvements in the Production of Compound Steel
Making Cutting Tools and the like.
Bars ΤΟΥ
We, JOSEPH BEDFORD, of Haymarket Chambers, in the City of Sheffield, Steel
Manufacturer, and JOSEPH ASHTON, of 18, Thoresby Road, also in the said City of
Sheffield, Engineer, do hereby declare the nature of this invention and in what

page_text: •
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
Our invention relates to the production of bars composed of a superior quality of
cast steel enclosed or partially surrounded by a greater body of a cheaper steel or
iron to give the requisite support and firmness to the higher grade steel when put
into use as a tool.
The principal object is to provide a tool of maximum grade or quality at a minimum
cost of material and labour.
The accompanying drawings illustrate the method of procedure to obtain bars
suitable for making tools from.
Fig. 1, is a cross section of a rough bar ready to receive the bar of cast steel.
Fig. 2, illustrates a section of a finished bar, the cast steel having double bevil sides.
Fig. 3, shows a similar section, the cast steel having concave sides. Fig. 4, shows
in perspective tool ready for use in say a lathe. Fig. 5 is also a cross section of
bar, showing various shapes of cast steel secured in corners. Fig. 6, illustrates a
representative series of cross sections of cast steel bars. Fig. 7, represents a flat bar
having cast steel in one edge.
To carry our invention into effect, we make from the requisite quality of cast
steel a comparatively small bar of any desired shape or section indicated by the
letter B. Likewise from a relatively inferior quality of tough steel or iron we produce
a larger bar A, of say a square or flat section and sink in one or more of its sides,
corners or edges a groove or grooves or recess of suitable size and shape to receive
the bar of cast steel B, the said bar we place within the said recess while the
larger piece is still hot, or the bars may be put together with both bars cold, in
which case the compound bar is to be put into a re-heating furnace, avoiding a
welding heat, in either case the compound bar may be finished by pressure of rolls
or by hammering in manner practised for tool bars.
On reference to Fig. 1, it will be apparent that the groove in the rough bar A,
would receive any section of cast steel B, Fig. 6 of corresponding dimensions, a
piece B having been inserted the compound bar is to be finished to the required
size and shape say as Figs. 2 and 3 by pressure. The softer metal in any case will
conform internally to the outline of the harder cast steel, and when cold will have
a secure and firm grip upon and be in uniform contact with the cast steel B.
The tools of which Fig. 4 is an example may thereafter be forged and finished
exactly as if from homogenous steel bars.
When it is desired to produce a bar having cast steel in one or more of its corners,
say as Fig. 5, the bar A is to be roughly formed with the required number of
grooves to receive sections of steel say as B1, B2, B³, the finishing in any case
being as before named.
Fig. 7 shows one method of inserting cast steel B into a flat bar A when intended
for working up to a bevilled edge. It is evident steel B may likewise be secured in
both edges for other classes of work when desired.
We would have it understood that we do not confine ourselves to the exact
shapes or proportions of materials herein illustrated, as our method is capable of
great variation and adaptation to meet particular needs.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
1st. A compound bar for making cutting tools, consisting of an inner bar of
harder metal and an enclosing bar of softer metal pressed on the same, the inner
bar being of lesser width at its front than at one or more inner points in order
that the material of the outer bar may resist withdrawal of the inner bar and
the compound bar may be practically as one piece, substantially as set forth.
2nd. A compound bar consisting of an inner bar of harder material having
recesses in its sides and an outer bar of softer material which is channelled to

page_text: receive the said inner bar and rolled or otherwise pressed into the said recesses,
substantially as set forth.
n
200
1
ป
11.000
ISAAC BECK, F.S.P.A.,
Agent for the Applicants,
Haymarket Chambers, 17, Haymarket, Sheffield.