IMPROVEMENTS IN PUNCHING APPARATUS.
Year: 1877

page_text: LETTERS PATENT to John Fulton, of Greenock, in the County of Renfrew,
North Britain, Engineer, for the Invention of "IMPROVEMENTS IN PUNCHING
APPARATUS.
Sealed the 15th February 1878, and dated the 21st August 1877.
PROVISIONAL SPECIFICATION left by the said John Fulton at the Office
of the Commissioners of Patents on the 21st August 1877.
"
JOHN FULTON, of Greenock, in the County of Renfrew, North Britain, Engineer.
'IMPROVEMENTS IN PUNCHING APPARATUS.'
This Invention has for its object to improve the action and construction of
punching apparatus of the kind in which the punch is worked by means of an
eccentric or cam lever and a screw spindle; and it consists mainly in forming, the
eccentric or cam head on the lever on the opposite side of the fulcrum from the arm
of the lever, so that the lever arm is moved away from, instead of, as heretofore,
towards the body of the machine when punching. The screw spindle has right-
hand and left-hand screw threads on it as usual, one end being tapped through a
swivelling nút held in the body, and the other end being tapped through a
swivelling nut jointed to the outer end of the lever arm.
In consequence of the improved arrangements described, the leverage, which
changes as the punching action proceeds, is greater at the commencement when
there is the entire thickness of the plate to resist it, which is an important practical
advantage. For lifting back the punch or punch holder, a pair of small lever plates
are jointed to the sides of it, and their middle parts rest on a flat surface formed in
the body or frame of the machine, whilst their back ends are acted on by, pins on
the lever arm, so as on the lever descending to cause the punch to be prised up.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Fulton in the Great Seal Patent Office on the 19th February
1878.
JOHN FULTON, of Greenock, in the County of Renfrew, North Britain, Engineer.
"IMPROVEMENTS IN PUNCHING APPARATUS."
My said Invention has for its object to improve the action and construction of
punching apparatus of the kind in which the punch is worked by means of an
eccentric or cam lever and a screw spindle; and it consists mainly in forming the
eccentric or cam head on the lever on the opposite side of the fulcrum from the arm
of the lever, so that the lever arm, is moved away from, instead of, as heretofore,
towards the body of the machine when punching. The screw spindle has right-
hand and left-hand screw threads on it as usual, one end being tapped through a
swivelling nut held in the body, and the other end being tapped through a
swivelling nut jointed to the outer end of the lever arm.
In consequence of the improved arrangements described, the leverage, which
changes as the punching action proceeds, is greater at the commencement, when
there is the entire thickness of the plate to resist it, which is an important practical
advantage.
And in order that my. said Invention and the manner of performing the same may
be properly understood, I hereunto append a Sheet of explanatory Drawings, to be
herein-after-referred to, and representing one modification of my improved punching
apparatus. In these Drawings the same reference numerals are used to mark the
same or like parts wherever they are repeated.
.
Figure 1 on the accompanying Sheet of Drawings is a front elevation, and
Figure 2 is a side elevation of one modification of my improved punching apparatus.
The body 1 of the machine is formed with two vertical side extensions or
cheeks 2, in which the fulcrum pin 3 of the lever 4 is carried. The eccentric or
cam head 5 is formed upon the lever 4 on the opposite side of the fulcrum from
the arm of the lever 4, and operates upon the punch holder 6, between the upward
side extensions or cheeks 2. The screw spindle 7, having right-hand and left-hand
screw threads on it as usual, has one end tapped through a swivelling nut or pin 8
fitted in a hole bored through the outer end of the lever arm 4, whilst the other end
is tapped through a swivelling nut or pin 9 similarly fitted in a hole in a backward
extension 10 of the body of the punch. The parts in which the nuts or pins 8, 9,
are fitted, and in which they can swivel, have elongated angular slots made in them
above and below for the passage of the screw spindle 7. The body 1 of the punch
is formed with jaws in the usual manner for the reception of the plates to be
operated upon. For lifting back the punch holder 6 it is provided with side
plates 11 having inward projections at their upper ends, which are acted upon by.
flanges 12 formed on the eccentric or cam head 5 of the lever 4.
Instead of the described arrangement for lifting back the punch holder 6,
there may be provided a pair of small lever plates jointed to the sides of the
punch holder, with their middle parts resting on a flat surface formed in the body
or frame of the machine, whilst their back ends are acted on by pins on the lever,
arm 4, so as on the lever descending to cause the punch to be prised up.
Having thus particularly described my said Invention and the manner of per-
forming the same, I have to state that I do not restrict myself to the precise
details herein described or delineated, but that what I believe to be novel and
original, and claim as the Invention secured to me by the herein-before in part
recited Letters Patent is, the forming of the eccentric or cam head (5) on the

page_text: opposite side of the fulcrum from the lever arm (4), substantially as and for the
purposes herein-before described.
In witness whereof, I, the said John Fulton, have hereunto set my hand and
seal, this Eighteenth day of February, in the year of our Lord One thousand
eight hundred and seventy-eight.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
JOHN FULTON. (L.S.)