Improvements in Apparatus for Cutting Off the Heads of Rivets.
Year: 1894

page_text: Date of Application, 10th Sept., 1894
Complete Specification Left, 8th June, 1895-Accepted, 10th Aug., 1895
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Cutting Off the Heads of Rivets.
I, WILLIAM JOHN PECKETT, of 100 Church Path, Grays, in the County of
Essex, Engineer, do hereby declare the nature of this invention to be as
follows :-
According to this invention the cutter is fixed directly to the ram or piston of a
hydraulic or other cylinder, or it might be to the body.
When the apparatus is required for cutting off the heads of rivets connecting
two overlapping plates the cylinder has a hook at its top to fit over the edge of
the outer plate and take the thrust of the cutter which is fixed on the side of the
piston or ram. When the apparatus is required for cutting off the heads of rivets
connecting a plate to a beam or girder the hook is fixed to the bottom of the
cylinder and is made of such a size and form that it will encircle the beam or
girder its end taking a bearing on the opposite side to the rivet to be cut.
The annexed drawings show examples of apparatus constructed according to this
invention. a is the cylinder, b the hook carried by it, c the ram, d the cutter fixed
to it, and e the rivet head to be cut off.
In the figure on Sheet 2 the cylinder and ram are not shown and is a punch
which may be used in cases where it is desired to punch out a rivet.
Dated this 10th day of September 1894.
WILLIAM JOHN PECKETT.
I, WILLIAM JOHN PECKETT, of 100 Church Path, Grays, in the County of
Essex, Engineer, do hereby declare the nature of this invention and in what mauner
the same is to be performed to be particularly described and ascertained in and by
the following statement :-
According to this invention the cutter is fixed directly to the ram or piston of a
hydraulic or other cylinder or it might be to the body.
When the apparatus is required for cutting off the heads of rivets connecting two
overlapping plates the cylinder has a hook at its top to fit over the edge of the
outer plate and take the thrust of the cutter which is fixed on the side of the
piston or ram. When the apparatus is required for cutting off the heads of rivets
connecting a plate to a beam or girder the hook is fixed to the bottom of the
cylinder and is made of such a size and form that it will encircle the beam or
girder its end taking a bearing on the opposite side to the rivet to be cut.
The drawings annexed to the Provisional and to this Specification show examples
of apparatus constructed according to this invention. a is the cylinder, the hook
carried by it, c the ram, d the cutter fixed to it, and e the rivet head to be
cut off.
In the figure on Sheet 2 of the drawings annexed to the Provisional Specification
the cylinder and ram are not shewn and is a punch which may be used in cases
where it is desired to punch out a rivet.

page_text: In the drawings annexed to this Specification Figure 1 shows a machine which
closely resembles that shewn on Sheet 1 of the drawings annexed to the
Provisional Specification but the ram is made solid and the cylinder is prolonged.
It is designed to cut rivet heads at lap and like joints and works off the edge of the
plate or other suitable place. It is not generally convenient to make the machine
to take more than two rows of rivets. It will be obvious that the cutter may be
caused to travel away from instead of towards the abutment.
Figure 2 shows a machine designed to cut rivets between frames and like places
generally using round tool steel for cutters, I sometimes make the cylinder and ram
elliptical, at others I keep the cutter below the centre of the ram. To prevent the
necessity of having a long traverse of the ram I have tools of different length or
employ thrust bars g of various lengths to allow for the varying distances of the
rivets apart.
Figure 3 shows a machine for cutting rivets out of butt covers and similar places
this device ensures the required rivet being cut, the resistance of river to be cut
being distributed on two others. In this case two cylinders a a' are employed
connected by a passage h through the ram c which is common to both. The end of
the larger cylinder a forms the cutter whilst the end of the smaller cylinder a¹ and
the flange c' on the ram e both form abutments. By this means the central rivets
of butt covers can be cut whilst the edge rivets are afterwards removed by the
machine shown in Figure 1. The cutters are generally circular or with facets cut
on the periphery.
The means for supplying fluid under pressure to the machines are not shown in
the drawings. Any ordinary arrangement may be employed and may either form
part of or be separate from the machine.
In some cases I make the ram or ram head elliptical to bring centre of effort as
nearly as possible in line with the cutter, at other times it is convenient to arrange
the ram head eccentrically with the guide and cutter.
In some machines when round steel lengthening pieces are used I make the thrust
end conical, and at other times of chisel form to prevent it from slipping from the
point of contact.
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 :-
1. Apparatus for cutting off the heads of rivets in which the cutter is fixed
directly to the ram or piston or to the cylinder substantially as described.
2. Apparatus for cutting off the heads of rivets substantially as described and
shown in the drawings.
1
T