Improvements in Cutting Tools, and in Holders therefor.
Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Law Officer of the 3rd day of March 1898.
l'Hospital, Brussels, in the Kingdom of Belgium, Mechanician. J
Improvements in Cutting Tools, and in Holders therefor.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Patent
Agents, 46 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 made of steel of double triangular section an:
to a tool-holder for receiving the said tool.
The form of the edge to be given to this steel section is adapted to the different
uses to which the tool in question is to be put. A twist drill may be obtained
by twisting the aforesaid steel section.
This double triangular steel scotion is obtained by rolling or by forging in a
matrix of appropriate form. It presents, in transverse section, the form of two
equal triangles joining at their apex, such section being however strengthened on
either side about the line of intersection. The angles formed at the junction of
the apexes will always be the same whatever may be the height of the transverse
section.
Seeing, therefore, that the form of the section will remain invariable, the height
of the section only varying according to circumstances, the same tool-holder will
bo suitable for tools of every size, contrary to what at present obtains.
The form of tool-holder which I have found gives the best results comprises
a shank serving to fix the tool-holder in the machine, this shank is strengthene !
or enlarged at its upper portion and terminates in a fixed jaw which is provided
with a cheek through which are bored two holes for the reception of bolts. The
jaw. is given the form of a triangle with rounded apex suitable for engaging in
the corresponding triangular recess in the steel section.
A second and movable jaw of the same form as the fixed jaw and like the
latter provided with a cheek having two holes for the reception of bolts, engages
the corresponding triangular recess upon the opposite side of the tool. This
movable jaw is bolted to the fixed jaw by means of bolts which are passed through
the holes provided in the cheeks after the tool has been introduced between then.
It will readily be understood that, as the tool has always the same transverse
section, the height of this section only varying, the tool will always be held in the
same manner in the tool-holder whatever the height of the said section may be, in
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page_text: other words, the axial plane of the tool will be identical with the axial plane of
the shank of the tool-holder, which is extremely advantageous.
Dated this 26th day of August. 1896.
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in Cutting Tools, and in Holders therefor.
I, WILLIAM ROBERT LAKE, of the Firm of Haseltine, Lake & Co., Pateni
Agenta, 45, Southampton Buildings, in the County of Middlesex, do hereby
declare the nature of this invention aud 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 made of steel of double triangular section, and
to a tool-holder for receiving the said tool.
In the accompanying drawings Figures 1 to 4 show forms of tools made
according to my invention. Figures 5 to 6 show a tool holder therefor, and
Figure 8 is a detail in section of the tool.
In Figures 1, 2 and 3 is shown the form of edge given to this steel section such
edge being adapted to the different uses to which the tool in question is to be put.
Figure 4 shows a twist drill obtained by twisting the aforesaid steel section.
This double triangular steel section is obtained by rolling or by forging in a
matrise of appropriate form. It presents, in transverse scotion, the form of two
equal triangles joining at their apex, such section being however strengthened on
either side about the line of intersection, as shewn by the diagrammatio view in
Figure 8 of the drawings. From this view it will be apparent that the angles
formed at the junction of the apexes will always be the same whatever may be the
height of the transverse section.
Seeing, therefore, that the form of the section will remain invariable, the height
of the section only varying according to circumstances, the same tool-holder will
be suitable for tools of overy size, contrary to what at present obtains.
The form of tool-holder which I have found gives the best results is that shewn
in front elevation in Figure 5 of the drawing, in side elevation in Figure 6, and in
horizontal projection in Figure 7.
a is the shank serving to fix the tool-holder in the machine, this shank is
strengthened or enlarged at its upper portion 6 and terminates in a fixed jaw o
which is provided with a cheek d through which are bored two holes for the
reception of bolts. The jaw is given the form of a triangle with rounded apex
suitable for engaging in the corresponding triangular recess in the steel section.
A second and movable jaw e of the same form as the fixed jaw c and like the
latter provided with a cheek f having two holes for the reception of bolts, engages
the corresponding triangular recess upon the opposite side of the tool. This
movable jaw is bolted to the fixed jaw by means of the bolts 9 and h which are
passed through the holes provided in the cheeks after the tool has been introduced
between them.
It will readily be understood that, as the tool has always the same transverse
section, the height of this section only varying the tool will always be held in the
same manner in the tool-holder whatever the height of the said section may be, in
other words, the axial plane of the tool will be identical with the axial plane of
the shank a of the tool-holder, which is extremely advantageous.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed, as communicated to me
by my foreign correspondent, I am aware that it has been previously proposed
to form steel bars with longitudinal grooves for the manufacture of tools and
in particular I am aware of Lake's Specification No. 6672 of 1890, and I wish
it to be understood that I do not claim anything described and claimed in the
said specification, but I declare that what I claim is:-
1. The steel section having the form of two equal triangles joining at their
apex, such section being strengthened on either side of the point of intersection
of the said triangles, the resulting section remaining the same whatever the
dimensions of the steel from which the tool is formed may be.
. 2. A tool-holder consisting of two jaws, one of which is fixed and forms a
prolongation of the shank of the tool-holder whilst the other is movable; the
form of these two jaws corresponding to the form of the recess in the steel section.
of which the tool is made, such jaws being connected by means of bolts passing
through corresponding holes made in the cheeks with which the jaws are provided.
Dated this 2nd day of April 1897.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.