Improvements in Apparatus for Punching Holes in Slates.
Year: 1890

page_text: Date of Application, 14th Aug., 1890
Complete Specification Left, 4th June, 1891-Accepted, 14th Aug., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Punching Holes in Slates.
I, JOHN HENRY DAGGE of 26 Upper Sherrard Street in the City and County
of Dublin, Civil Servant, do hereby declare the nature of this invention to be as
follows:-
This invention relates to apparatus for punching holes in slates, and the object
of the invention is to expeditiously punch and countersink the hole in one operation
and to ensure the position of the holes being to any required gauge.
According to my present invention, such apparatus consists of a base to which
the die or bolster is attached and an arm or lever, hinged to the base, in which the
punch holder is carried.
The base is also provided with two sliding gauges, the one adjustable in the
direction of the arm or lever and forming a guide for it, and the other in a direction
at right angles to this. The slate to be punched is placed over the bolster and
under the arm with two of its adjacent edges abutting against these gauges, the
position of the hole to be punched in the slate being thus determined.
The arm or lever is hinged to the base at the back of the machine and the hinge
is sufficiently remote from the bolster to permit of the introduction, under the arm,
of the largest sized slate to be operated upon by the machine.
The punch is detachably secured to the holder which is so carried in the arm as
to be capable of movement in a vertical direction which coincides with the centre
line of the hole in the bolster when the arm is in its lowest position, that is
resting on the slate; and a spring is provided which keeps the punch normally
raised relatively to the arm so that the bottom of the punchi is clear of the under
side of the arm.
The punch itself may be detached from the holder and renewed as required; and
the top of the holder is adapted to receive the blows of the hammer which is used
to force the punch through the slate.
The arm carrying the punch is provided with a spring near the hinge which
always keeps the arm raised above the base sufficiently to permit the introduction
of the slate without the necessity of raising the arm.
A buffer of rubber or other suitable material is employed to bring the punch to
rest after it has pierced the slate, and the spring before mentioned brings the punch
back into position ready for punching the next hole.
The gauges being set to the required positions, the slides being graduated for
this purpose, the slate is introduced below the arm and over the bolster and its
adjacent edges brought into contact with the gauges, the arm is pressed down on to
the slate, and the punch holder is struck a smart blow with a hammer and the slate
is pierced by the punch.
1000
SLOAN & LLOYD BARNES,
Castle Chambers, Castle Street, Liverpool, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Punching Holes in Slates.
I, JOHN HENRY DAGGE formerly of 26 Upper Sherrard Street but now of
2 Harrington Street in the City and County of Dublin, Civil Servant 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 apparatus for punching holes in slates, and the object
of the invention is to expeditiously punch and countersink the hole in one operation
and to ensure the position of the holes being to any required gauge.
In the accompanying drawings which illustrate my invention,
Fig. I is a perspective view of the machine and
Fig. II a section across the lever showing the punch and holder.
According to my present invention, such apparatus consists of a base A to which
the die or bolster B is attached and an arm or lever C hinged to the base, in which
the punch holder D is carried.
The base is also provided with two sliding gauges, E and F, the former adjustable
in the direction of the arm or lever and forming a guide for it, and the latter in a
direction at right angles to this. The slate to be punched is placed over the bolster
and under the arm with two of its adjacent edges abutting against these gauges, the
position of the hole to be punched in the slate being thus determined.
The arm or lever is hinged at G to the base at the back of the machine
and the hinge is sufficiently remote from the bolster to permit the introduction,
under the arm, of the largest sized slate to be operated upon by the machine.
The punch His detachably secured to the holder which is so carried in the arm
as to be capable of movement in a vertical direction which coincides with the central
line of the hole I in the bolster when the arm is in its lowest position, that is resting
on the slate; and a spring J is provided which keeps the punch normally raised
relatively to the arm so that the bottom of the punch is clear of the under side of
the arm.
The punch itself may be detached from the holder and renewed as required;
and the top of the holder is adapted to receive the blows of the hammer which is
used to force the punch through the slate.
The arm carrying the punch is provided with a spring K near the hinge which
always keeps the arm raised above the base sufficiently to permit the introduction
of the slate without the necessity of raising the arm.
A buffer L of rubber or other suitable material is employed to bring the punch
to rest after it has pierced the slate, and the spring before mentioned brings the
punch back into position ready for punching the next hole.
The gauges being set to the required positions, the slides being graduated for
this purpose, the slate is introduced below the arm and over the bolster and its
adjacent edges brought into contact with the gauges, the arm is pressed down on to
the slate and the punch holder is struck a smart blow with a hammer and the slate
is pierced by the punch.
As the hole in the bolster is somewhat larger in diameter than the diameter of
the punch, and as the edge of the bolster bearing under the slate is sharp the act.
of punching the hole in the slate breaks away the under-side of the slate bounded
by the edge of the hole and so forms the countersink.
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
1. In apparatus for punching holes in slates, the combination of a punch detachably
secured to a holder, an arm hinged to the base of the machine in which the said

page_text: holder slides being kept normally raised by a spring and a bolster fixed to the base
of the machine so that the hole therein is concentric with the punch when the arm
is depressed, substantially as described.
2. In apparatus for punching holes in slates, in combination with the punch H,
the holder D and arm C, a bolster B having a hole I of larger diameter than
the punch, the top of said hole having a sharp edge raised above the level of the
base so that the slate rests on this edge when it is punched, and is thus countersunk
on its underside, substantially as described.
3. In combination with the punch H the holder D the arm C and the bolster B,
the adjustable guides E and F for locating the hole in the slate, substantially as
described.
4. The improved apparatus for punching holes in slates substantially as described
and illustrated in Figs. I and II.
Dated this 10th day of Avrust 1890
SLOAN & LLOYD BARNES,
Agents for the Applicant.