An Improved Tool Holder, suitable for Lathes and other Machine Tools.
Year: 1899

page_text: Date of Application, 6th Apr., 1899
Complete Specification Left, 30th Dec., 1899-Accepted, 10th Mar., 1900
PROVISIONAL SPECIFICATION.
An Improved Tool Holder, suitable for Lathes and other Machine
Tools.
I, ERNEST FERRY, of 10, Malvern Street, Newcastle-on-Tyne, in the County of
Northumberland, Mechanical Engineer, do hereby declare the nature of this
invention to be as follows:-
This invention relates to an improved tool holder suitable for lathes and other
machine tools.
The end of the holder is provided with a recess in which a cutter is fixed and a
bolt or bolts for holding the cutter fast in the recess. The sides of the holder
are straight and practically parallel to the end. The top and bottom of the holder
are parallel and straight until near the end when they are angled so that the cutter
lying in the recess on one side has the cutting edge projecting over the end of
the holder. The outer edge of the recess dovetailed or undercut, the inner
edge is at right angles while the two edges are preferably parallel to each other.
The outer end of the side opposite the recess may be rounded. The bolt has
the head end sunk in the holder and squared to prevent turning, and has one side
of the head angled-to correspond to the dovetail in the recess. The cutter lies
between the dovetailed side of the recess and the bolt head. The bolt is tightened
up against the cutter by a nut on the other side of the holder.
Dated this lith day of April 1800
HERBERT HADDAN & Co.,
Agents to Applicant.
An Improved Tool Holder, suitable for Lathes and other Machine
Tools.
I, ERNEST FERRY, of 10, Malvern Street, Newcastle-on-Tyne, in the County of
Northumberland, Mechanical Engineer, 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 an improved tool holder suitable for lathes and other
machine tools.
The end of the holder is provided with a recess in which a cutter is fixed and a
bolt or bolts for holding the cutter fast in the recess. The sides of the holder
are straight and practically parallel to the end. The top and bottom of the holder
are parallel and straight until near the end when they are angled so that the cutter
lying in the recess on one side has the cutting edge projecting over the end of
Price S11

page_text: the holder. The outer edge of the recess is dovetailed or undercut, the inner
edge is at right angles while the two edges are preferably parallel to each other.
The outer end of the side opposite the recess may be rounded. The bolt has
the head end sunk in the holder and squared to prevent turning, and has one side
of the head angled to correspond to the dovetail in the recess. The cutter lies
between the dovetailed side of the recess and the bolt head. The bolt is tightened
up against the cutter by a nut on the other side of the holder.
Reference being made to the accompanying sheet of drawings. Fig. 1 is a
perspective view of the improved holder with tool therein. Fig. 2 is a plan.
view thereof without the tool. Fig. 3 is an elevation of the same with the tool
therein.
A prismatic bar a has its end a¹ made so that the lower face of the end
piece a is at an obtuse angle thereto. The upper face of the end piece may be
rounded downwardly. In one side face of this end piece a¹ is a recess d which
extends across the side face of the end piece a¹ in a direction at right angles to the
general direction of said end piece, that is to say, with its axis perpendicular to
the lower face. The recess is open at its ends at the upper and lower faces
of the end piece and it is bounded towards the outer extremity of end piece by an
undercut edge e and towards the bar a by a vertical edge f. The side face of the
end piece opposite to that in which is the recess d is rounded as shown in Fig. 2.
A bolt c passes through the end piece a¹ from one side to the other, a passage d
being made in the end piece to receive it. The head g of the bolt c is prismatic
and fits in a prismatic recess g in the end piece a', one face g of the bolt head g
being undercut and projecting through a cut-away portion of the vertical por-
tion of the vertical face f. The other end of bolt c is screw threaded to receive
a nut h which bears against the side face of the end piece a' on the side other
than that containing the recess d in order to adjust the bolt c in such a manner as
to firmly hold a tool such as b in the recess & between the under-cut faces eg².
The cutter bolt may be rounded at g if preferred instead of being square as
shown in the drawing.
The end a of the tool holder may be rounded, laterally as at a² Fig. 2 and
downwardly as at a Fig. 3 or may be inclined at any suitable angle to the
shank and is not necessarily rounded.
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:-
In a tool holder the combination of a stem a having an end piece a¹ having its
under face at an obtuse angle to the stem a, having its upper face rounded down-
wardly and having one side face parallel to the side face of the stem a and the
other side face rounded, the said end piece also having in its flat side face a
lateral recess d whose axis is perpendicular to the lower face of the end piece a¹
open at the ends and bounded towards the outer end of the end piece by an under-
cut edge and towards the stem by a vertical edge f and having a passage-
way c partly prismatic at g¹ with a bolt c having a prismatic head
for engage-
ment with said prismatic part 1 of the passage way and an undercut face
said head and means for moving said bolt in a direction perpendicular to the
plane of the recess for the purpose set forth.
Dated this 30th day of December 1800
on
HERBERT HADDAN & Co.,
Agents to Applicant, 18, Buckingham Street, Strand, W.C.