Improvements in the Manufacture of Tool-steel Bars.
Year: 1890

page_text: Date of Application, 30th Apr., 1890
Complete Specification Left, 12th Feb., 1891-Accepted, 14th Mar., 1891
PROVISIONAL SPECIFICATION.
[Communicated from abroad by J. GARNIER, of Laeken, near Brussels, in the
Kingdom of Belgium, and ADRIEN WEIL, of Marley-lez-Valenciennes, in the
Republic of France.]
Improvements in the Manufacture of Tool-steel Bars.
I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, Southampton Buildings, in the County of Middlesex, do hereby declare
the nature of this invention to be as follows:-
This invention relates to a tool-steel bar which is provided with two longitudinal
channels or grooves and made of such a section that drills and the like can be
readily made from the same.
The improved tool-steel-bar can be produced either by rolling or by drawing
according to the size of its transverse section or also by removing certain parts
from a round bar of steel by means of a file, drill or the like so as to form the
aforesaid channels or grooves and obtain the desired section.
One of the advantages presented by the bar made according to this invention as
compared with the bars from which drills have heretofore been manufactured, is
that it possesses plane checks enabling the friction of the tool to be reduced to a
minimum.
It is however understood that the section of the bar made by rolling or drawing
and having two channels or grooves of any desired shape arranged on diametrically
opposite sides over the entire length of the latter can be optionally varied without
departing from the nature of the said invention.
A bar of the desired section having been obtained as above described it will be
sufficient, for manufacturing a tool which can be used in lieu of the spiral drill or
any other kind of drill to provide the cutting edges at the extremity of the bar on
the right and left hand side.
The drill thus formed can be employed for any kind of materials such as metals,
wood and the like.
1
1000
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tool-steel Bars.
1, HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co., Patent
Agents, 45, Southampton Buildings, in the County of Middlesex, 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 :-
This invention relates to a tool-steel bar which is provided with two longitudinal
channels or grooves arranged at diametrically opposite sides of the same, the said
bar being made of such a section that drills and similar tools can be easily and
expeditiously made therefrom.
The said bar is illustrated in the accompanying drawing in which
Figure 1 is a cross section of the bar and Figure 2 is a side elevation of the
same.
The improved tool-steel bar can be produced either by rolling or by drawing
according to the size of its transverse section or also by cutting or removing certain

page_text: parts from a round bar of steel by means of a file drill or the like as indicated in
dotted lines in Figure 1 so as to form the aforesaid channels or grooves and obtain
the desired section.
One of the advantages presented by the har made according to this invention as
compared with the bars from which drills have heretofore been manufactured is
that it possesses plane cheeks by which the friction of the toul is reduced to a
minimum.
It is to be understood however that the section of the bar made by rolling or
drawing as above described, and having two channels or grooves of any desired
shape extending over the entire length of the said bar can be varied at will without
departing from the nature of the said invention.
A har of the desired section having been obtained as above described it will be
sufficient for manufacturing a tool which can be used in lieu of the spiral drill or
any other kind of drill, to provide the cutting edges at the extremity of the bar on
the right and left hand side. The drill thus formed can be employed for any kind
of materials, such as metals, wood and the like.
Flaving now particularly described and ascertained the nature of the invention.
and in what manner the same is to be performed, as communicated to me by my
foreign correspondents. I declare that what I claim is :-
A steel-bar for tools such as drills and the like having two longitudinal grooves
arranged at diametrically opposite sides of the said bar and extemling the entire
length of the latter, the said bar being produced by rolling, drawing, filing, drilling
or the like, substantially as described and shown in the drawing.
Dated this 11th day of February 1891.
HASELTINE, LAKE & ('n.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.