A Tool Holder for Boring Tools and Drills to be Used in Conjunction with a Turning Lathe.
Year: 1888

page_text: Date of Application, 9th Nov., 1888
Complete Specification Left. 26th July. 1889-Accepted, 31st Aug., 1889
PROVISIONAL SPECIFICATION.
A Tool Holder for Boring Tools and Drills to be Used in
Conjunction with a Turning Lathe.
I, BALDWIN HARRY BENT, B.A. 9. Malcolm Street Cambridge, Engineer &
Demonstrator of Mechanism & Applied Mechanics in the University of Cambridge
do hereby declare the nature of this invention to be as follows:-
A tool-holder for boring tools and drills to be used in conjunction with a turning
lathe.
It consists of a shank of steel iron or other metal, drilled throughout its length,
to receive the boring tool or drill.
At one end of said shank a hole is drilled, at right angles to aforesaid hole, to
receive a steel pin, screwed at one end and having a hole drilled in it perpendicularly
to its axis, at its other end through which the boring tool or drill passes before
entering the hole in the shank.
The boring tool or drill is secured by means of a nut on the screwed end of
aforesaid steel pin.
On tightening the nut, the boring-tool or drill is brought into close contact with
the shank and clamped in the desired position.
The advantages claimed are
Firstly that boring tools or drills can be made with less labour than otherwise,
out of round or other shaped steel bar.
Secondly that the boring tool or drill can be adjusted in length to suit the
depth of the hole to be made.
Thirdly that boring tools and drills of different strengths and sizes can be used
with the same tool-holder, substantially as set forth.
Dated this 8th day of November 1888.
COMPLETE SPECIFICATION.
A Tool Holder for Boring Tools and Drills to be Used in
Conjunction with a Turning Lathe.
I, BALDWIN HARRY BENT, B.A., of 9 Malcolm Street, Cambridge, Engineer, and
Demonstrator of Mechanism and Applied Mechanics to the University of Cambridge,
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:-
The object of my invention is to construct a neat and practicable tool holder for
carrying or holding boring or other tools or drills and especially suitable for use
in connection with turning lathes.
My invention will be clearly understood by reference to the accompanying
drawings.
Figure 1 shews a tool holder constructed according to my invention in elevation,
and Figure 2 is a sectional plan of same.
Figure 3 is a central longitudinal vertical section showing the head portion of
the tool holder the tool shewn as held by the said tool holder in Figures 1 and 2
having been removed.
Figure 4 shews the bolt or steel pin detached and is an elevation of same taken at
right angles to Figures 1 and 3.
According to my invention I form the tool holder with a shank A of steel, iron or
other material and drilled or formed hollow throughout its length in order to receive
the drill, boring, or other tool.

page_text: In the head A of the said shank A there is a hole (at right angles to the hole in
the shank) which receives a steel or other pin B best seen at Figures 3 and 4.
This pin B is screwed at one end and is formed with a hole or slot BI in a direction
perpendicular to its axis, at its other end, and is or may be also formed with a
head;
B2 is a nut on the screwed end of pin B. C is a washer, D represents a
tool in position.
The boring or other tool may be formed from round or other shaped metal bar and
is passed through the aperture or slot B of the pin B and down into the hollow
shank A. The nut of the pin B is then screwed up and the tool will be jambed and
held securely in the slot B and pressed between the head of the pin B and the
washer C whereby it can, before being thus secured, be adjusted in length to suit the
depth of the hole or other work that it is required to operate upon, and thus boring or
other tools of different strengths and sizes can be used with the same holder.
By the employment of tool holders constructed according to my invention a
relatively long piece of steel for oxample, may be used to form the cutter and when it
has been reduced by wear or otherwise, the piece which remains and which is
comparatively useless bears only a very small proportion to the part which has
been used.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is:-
First: In tool holders, the combination with a holding or clamping device, of the
hollowed handle or shank A for receiving the length or tail of the cutter substantially
as set forth.
Second: In tool holders the clamping or holding device consisting of the slotted
and screwed pin B with its nut, the said pin passing through the head of the holder
proper whereby the tool is clamped by the pin against the said head substantially
as set forth.
Third In tool holders, the screwed pin B and nut formed with slot B' and passing
through the head A' of the holder, in combination with the hollow shank A, alí
substantially as, and for the purposes herein set forth.
ABRI
YTAAAN
BALDWIN H. BENT.
By Brewer & Son,
33, Chancery Lane, London, Patent Agents.