IMPROVEMENTS IN HOLDING PUNCHES AND DRILLS IN PUNCHING
Year: 1872

page_text: LETTERS PATENT to William Millen and John Muir, both of Glasgow,
in the County of Lanark, North Britain, for the Invention of
" IMPROVEMENTS IN HOLDING PUNCHES AND DRILLS IN PUNCHING AND
Sealed the 22nd November 1872, and dated the 27th August 1872.
PROVISIONAL SPECIFICATION left by the said William Millen and
John Muir at the Office of the Commissioners of Patents, with
their Petition, on the 27th August 1872.
IN
We, WILLIAM MILLEN and JOHN MUIR, both of Glasgow, in the
County of Lanark, North Britain, do hereby declare the nature of the
said Invention of "IMPROVEMENTS IN HOLDING PUNCHES AND DRILLS
PUNCHING AND DRILLING MACHINES, AND IN THE MEANS EMPLOYED THEREFOR,"
to be as follows, that is to say :-
This Invention has for its object an improved system or mode of
holding punches and drills in their holders in punching and drilling
machines.

page_text: Under existing arrangements it is customary to form the punch or
drill with a neck projecting upwards from a shoulder on the punch or
drill, and which neck is inserted into a hole or opening formed in the
punch or drill holder. A cotter pin is thereafter driven through corre-
sponding slots in the holder and neck of the punch or drill, in order to
retain them in their proper positions relatively with each other.
Under this Invention the holder, in lieu of being formed with a hole
or opening therein, is constructed with a screwed part at its lower
extremity, and the punch or drill is formed with a taper or conical neck,
which is placed in a similarly formed opening in the lower part of a nut,
the head of the punch or drill projecting through the opening. The nut
is constructed with a screw thread at the interior thereof corresponding
to the thread formed on the drill or punch holder, and after the drill or
punch has been adjusted to its proper position in the nut the said nut is
scrwed on to the extremity of the holder, thereby firmly retaining the
drill or punch in position.
The depth of hole to be drilled or punched may be regulated by
inserting washers or discs of metal, leather, or other suitable material
between the upper end of the punch or drill and the lower extremity of
the holder.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said William Millen and John Muir in the Great Seal
Patent Office on the 26th February 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
MILLEN and JOHN MUIR, both of Glasgow, in the County of Lanark, 2
North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-seventh day of August, in the
year of our Lord One thousand eight hundred and seventy-two, in the
36th year of Her reign, did, for Herself, Her heirs and successors, give 3
and grant unto us, the said William Millen and John Muir, Her special
license that we, the said William Millen and John Muir, our executors,
administrators, and assigns, or such others as we, the said William
Millen and John Muir, our executors, administrators, or assigns;

page_text: should at any time agree with, and no others, from time to time and
at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and Isle
of Man, an Invention for "IMPROVEMENTS IN HOLDING PUNCHES AND DRILLS
IN PUNCHING AND DRILLING MACHINES, AND IN THE MEANS EMPLOYED THEREFOR,"
upon the condition (amongst others) that we, the said William Millen
and John Muir, by an instrument in writing under our hands and
seals, should particularly describe and ascertain the nature of the said
Invention, and in what manner the same was to be performed, and
cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
i
NOW KNOW YE, that we, the said William Millen and John Muir,
do hereby declare the nature of our said Invention, and in what
manner the same is to be performed, to be particularly described and
ascertained in and by the following statement, reference being had to
the accompanying Drawings, and to the letters and figures marked
thereon, that is to say :-
Our said Invention consists in constructing the holders of punches or
drills with a screwed part at their lower extremities, and in forming the
punch or drill with a conical or tapered neck, which is placed in a
similarly formed opening in a nut, the head of the punch or drill pro-
jecting through the opening. A screw thread is formed on the nut
corresponding to that on the holder, and when the punch or drill has
been adjusted the nut is screwed on to the extremity of the holder, thus
retaining the punch or drill in position.
And in order that our said Invention may be properly understood
we now proceed more particularly to set forth the system, mode, or manner
in or under which the same is or may be used or practically carried into
effect, that is to say :-
On the Sheet of Drawings hereunto appended the system or mode of
securing punches in their holders in punching machines in accordance
with this Invention is illustrated in side elevation at Figure 1, and in
vertical section at Figure 2. As shewn by these Figures the punch
holder A is formed with a screwed part B at its lower extremity, and
the punch C is formed with a tapered or conical neck D, which is

page_text: placed in a similarly formed opening in the lower part of a nut E, as
shewn at Figure 2, the head C of the punch projecting through the
under side of the opening. A screw thread is formed at the interior of
the nut E corresponding to the thread formed on the lower part of the
punch holder A; and after the punch has been placed in its proper E
position in the nut E the said nut is screwed on to the extremity B of
the punch holder, thereby firmly retaining the punch in position.
The system or mode of securing drills in their holders, embraced by
this Invention, is shewn in vertical section at Figure 3 of the Drawings.
The drill A is formed with a tapered or conical neck similar to that 1
formed on the punch, and is retained in position by the nut B in the
manner herein-before described. Slots C are formed in the opening
at the lower part of the nut, as shown in vertical section at Figure 3,
and in plan on the detailed view at Figure 4, in order to allow of the
point D of the drill being passed through the said opening.
The depth of hole to be punched or drilled is or may be regulated by
inserting washers or discs of metal, leather, or other suitable material
between the upper end of the punch or drill and the lower extremity of.
the holder, as shewn in vertical section at a, Figure 5.
]
In lieu of forming the punch or drill holder with a flanch at its upper 2
extremity, by which to secure it in position in the punching or drilling
machine, the said holder may be formed with a screwed prejection on
its upper extremity, similar to that on its lower end, and which is
screwed into a corresponding screwed opening in the flanch.
In place of fixing the rod E by a screw, as shewn, the screw may be 2
dispensed with, and a gib and cotter used in its place, passing through
slots formed in the nut E and projection B.
Having now described and particularly ascertained the nature of our
said Invention, and the system, mode, or manner in or under which the
same is or may be used or practically carried into effect, we desire to a
observe in conclusion that what we consider to be novel and original,
and therefore claim as the Invention secured to us by the herein-before
in part recited Letters Patent is, forming punches and drills with a
tapered or conical neck, and arranging or constructing punch or drill
holders with a screwed projection at the lower part thereof by means g
of a nut, screwed on to which the punch-or-drill is held in the

page_text: punching or drilling machine, as herein-before described and shewn on
the Drawings.
In witness whereof, we, the said William Millen and John Muir,
have hereunto set our hands and seals, this Twenty-fourth day
of February One thousand eight hundred and seventy-three.