An Appliance for Use in the Punching and Rivetting of Thin Plates.
Year: 1895

page_text: Date of Application, 23rd Feb., 1895-Accepted, 30th Mar., 1595
COMPLETE SPECIFICATION.
An Appliance for Use in the Punching and Rivetting of
Thin Plates.
I, HENRY JOHN WORSSAM of Wenlock Road, City Road, in the County of
London, 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:—
In punching thin plates and rivetting them together it is necessary to effect the
operations with great steadiness and regularity, otherwise there may be buckling
and deformation seriously impairing the character of the work, especially when the
material is of a very ductile nature such as copper. My invention relates to an
appliance whereby I ensure the steadiness and regularity required, as I shall
describe referring to the accompanying drawings.
and
Figs. 1 and 2 are transverse sections shewing the appliance in two conditions
Fig. 3 is a part plan.
I provide two strong bars A and B, which may be of the trough section as
shewn, or may be of other suitable section. They are longer than the longest seam
of the rivetting, and they are bolted together by bolts D clamping between them
the joint C of the two plates to be rivetted. The bolts D are necessarily beyond
the plates, and therefore the bolt holes are provided near the ends of the bars A, B,
several such holes near each end, a block E being introduced between the flanges
where the bolt passes through them. The vertical faces of the bars A, B, are
grooved with half round grooves F all at equal distances apart. The rivetting
tools G and H have bodies of rectangular section, and each has bolted to one side
of the body a strip K having a rounded edge just fitting the groove F.
The punching tools have bodies similar to the rivetting tools G, H, provided also
with strips K. A bar L is fixed parallel to each of the bars A, B, at a distance
equal to the thickness of the body of the tool. Bolts M with distance pieces and
fly nuts are employed to fix the bars L, numerous holes for these bolts being
provided at intervals apart through the bars A, B and L, so that when one of these
fixings comes in the way of a tool, the nut is unscrewed the bolt and distance piece
are removed and the fixing is made elsewhere. Also small bolts N with fly nuts
and washers are provided, so that, after some of the holes are punched, these can
be passed through the plates and secured by screwing down the nuts, thus more
effectually clamping the plates between the bars A, B, as shewn in Fig. 2.
The appliance is used in the following manner.
The bars A and B with the bars attached to them being bolted together
clamping between them the joint C of the plates, the punching tools are slid down
between Land A and up between L and B respectively, being guided by the edges
of the strips K sliding along the grooves F. The lower tool having its end
forming a die is held up by a heavy hammer while the upper tool having its end
formed as a punch is driven by the blow of a hammer.
The tools are then transferred to another of the grooves F and the operation is
repeated and so on along the line of the seam, all the holes being thus punched
accurately in line and at equal distances. When a number of the holes are thus
punched, some of the small bolts N can be applied. The rivetting tools G, H, are
applied in the same way as the punching tools.

page_text: 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
An appliance for use in the punching and rivetting of thin plates, constructed
and operated substantially as described.
Dated this 23rd day of February 1895.
ABEL & IMRAY,
Agents for the Applicant.