Year: 1888

page_text: Date of Application, 7th Jan., 1888
Complete Left, 14th Mar., 1888
Complete Accepted, 4th May, 1888
We WILLIAM. ALLAN of 6, Pioneer Crescent Wallsend-on-Tyne, Engineer and
JAMES MCBLAIN of 1 Cobden Street Wallsend on Tyne Engineer do hereby declare the
nature of this invention to be as follows :-
The object of our invention is to produce an improved punch for punching holes of
any shape without removing the plate that is being punched from the machine during
the operation.
The improved punch according to our Invention may be fitted to any ordinary
punching machine, without affecting the machine for Ordinary work.
In carrying out our Invention we prefer to fit the punch into a fixed die, fastened
to the moving jaw of the machine, said punch is free to rotate upon its own centre,
being kept in place by a pin screwed through the fixed die, into a groove formed
round the punch.
When said punch is raised to its full stroke in punching, a projecting tongue
formed upon the extremity of the punch, still remains about inside the die, thus
ensuring that when the punch is moved round so as to follow the outline of the hole
being punched the die also moves with it; a suitable lever being attached to said
punch to facilitate the operation of said circular movement.
1000
JAMES
STEVENSON,
Gray's Inn Chambers,
20, High Holborn, London, W.C.;
Agent for Applicants,
Under Power dated 3rd February 1888.

page_text: CUMI UNID
Improved Punch and Die for Punching Shaped Holes in Iron
and Steel Plates.
WILLIAM ALLAN of 6 Pioneer Crescent, Wallsend-on-Tyne, Engineer, and JAMES
MCBLAIN of 1 Cobden Street, Wallsend-on-Tyne, 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 :-
The object of our invention is to produce an improved punch for punching holes of
any shape without rendering it necessary to remove the plate during the operation of
punching, said punch being suitable for any type of punching machine without
affecting its utility for ordinary work. -
In order that our invention may be the better understood, we have appended the
accompanying sheet of drawings in which Figure 1 is an enlarged sectional elevational
view of the movable head and die bed of an ordinary punching machine with the
improved die attached thereto, and Figure 2 is a sectional plan view of same drawn
on line A. B. Figure 1. Figure 3 is an elevation of part of the frame of a punching
machine showing the punch and die in position.
In carrying out our invention, we form a punch c having a cylindrical body or
shank A fitting freely within the moveable head B upon the sliding jaw of the
punching machine. A semi-circular groove a is formed upon the shank A to allow of
à pin-indicated by a dotted line at keeping said shank of the punch in position
against the bed block G while the sliding jaw of the machine is moving upward, at
the same time that it allows of the rotation of the punch within its socket by the
horizontal lever b. The face c of the punch is provided with a projecting tongue.d
which is prolonged so as to remain within the recess of the die C when the moveable
jaw of the punching machine is at the top of the stroke. Said die C is provided with
a semi-circular groove a similar to the corresponding groove a in the shank of the
punch. A pin, shown by the dotted lines at allows of said die being rotated in
unison with the punch, when the latter is rotated by the lever b, the rotary motion
being communicated from the punch to the die by reason of the engagement of the
tongued with the corresponding part of the recess within the die, throughout the
whole stroke of the sliding jaw of the machine.
The arrangement of the device or contrivance according to our invention upon a
punching machine of ordinary. type and construction may be better understood on
reference to Figure 3 in which each part is identified by similar letters of reference
to those employed in describing Figures 1 and 2. The pins and are here shown
in position, and a thumb screw g is provided for the purpose of tightening the punch
within its socket, so that it cannot be rotated during the operation of punching unless
such rotary movement is desired by the operator.
We may however, modify the punch as above described, by arranging the tongue d
so as to be moveable and capable of adjustment; this is shown in the sectional eleva-
tional view Figure 4, and in the corresponding sectional plan Figure 5. In this

page_text: method a recess is formed within the moveable head B, carrying the punch A, for
the purpose of admitting the moveable tongue d, when it is required to move it
upward, to clear the punch A so that one hole may be punched through the plate
before the tongue d is lowered so as to engage with the die, and thus to follow the
outline of the hole that it is desired to punch out, in the manner herein before
described.
Having now particularly described and ascertained the nature of my said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
First In a punch for punching large circular or irregular shaped holes, the
method which we adopt for fitting the punch within a moveable socket upon the
sliding jaw of an ordinary punching machine, and, by means of a lever simultaneously
actuating the die so that it rotates in unison with the rotary movement of the punch
by means of a tongue or extension piece which may form part of the punch or may be
distinct therefrom and capable of adjustment substantially as herein described and
shown.
Second-In the improved punch herein described and referred to in the preceding
claim the mode of and means employed for moving the punch and die in unison
substantially as herein set forth and shown.
Third: In the device referred to in the preceding claims the method which we
adopt for starting the hole by removing the tongue or extension piece substantially as
and for the purposes herein set forth.