Improvements in the Manufacture of Tubular Rivets.
Year: 1891

page_text: Date of Application, 22nd Sept., 1891
Complete Specification Left, 18th July, 1892-Accepted, 20th Aug., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Tubular Rivets.
I JOHN THOMAS of 8 Aldermanbury Avenue in the City of London Engineer
do hereby declare the nature of this invention to be as follows:-
In the manufacture of tubular rivets it has been the practise hitherto to form
them in one of two ways that is to say either (1) by striking the blank from a
length of wire and boring out the tubular shank which is a costly process and not
entirely successful as the central boring cannot always be ensured aud (2) by
striking from a plate a blank of a circular part to form the head and two side pieces
which when bent down and formed in dies &c. will serve as the tubular shank.
These rivets though useful for many purposes and comparatively cheap are of little
use when strength is required.
The object of my invention is to manufacture rivets from steel suitable for all
purposes where great strength is required.
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In carrying out my invention I take a disc of thin steel which I submit to the
action of a pair of dies so as to form a shallow cap. I next submit the
action of a second pair of dies and if necessary to a third pair in order to
the tubular portion to the required length. I next submit the tube thus formed
and closed at one end to the action of another pair of dies by which the closed end
is flattened down and a head is formed of any suitable size.
The rivet is then submitted to the action of a reaming tool by which the edge of
the tube is bevelled off inwards and the rough edges are removed.
Tubular rivets thus formed will be more suitable for the usual purposes than the
ordinary rivets as they will have the same thickness all round and will have also
great strength especially when made of steel.
Dated this 22nd day of September 1891.
NEWTON & SON,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Tubular Rivets.
I JOHN THOMAS, of 8 Aldermanbury Avenue in the City 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 the manufacture of headed tubular rivets, it has been the practice hitherto to
form them in one of two ways, that is to say, either (1) by cutting the blank from
a length of wire, striking up a head, and then boring out the tubular shank,-a
process which is naturally costly, and not entirely successful, as the true boring of
the shank cannot always be ensured; and (2) by striking from a plate a blank
having a circular part to form the head, and two side strips, which, when bent down
and formed in dies, &c., will serve as the tubular shank. These rivets, though
useful for many purposes, and comparatively cheap, are of little use when strength
is required.
The object of my invention is to manufacture headed tubular rivets from steel
suitable for any purpose, especially where great strength is required.
In carrying out my invention, I take a disc of thin steel, which I submit to the
action of a pair of dies, so as to form a shallow cap. 1 next submit the cap to the
action of a second pair of dies, and if necessary, to a third pair, in order to draw out
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page_text: the tubular portion to the required length. I next submit the tube thus formed,
and closed at one end, to the action of another pair of dies, by which the closed end
is flattened down, and a head is formed of any suitable size.
In the accompanying drawing, I have shewn a rivet in the various stages of
manufacture;-thus
Fig. 1 is the disc blank.
Fig. 2 shews the shallow cap as struck up by the action of a pair of dies.
Fig. 3 shews the result of the first drawing operation,
Fig. 4 shews the result of the second drawing operation, and
Fig. 5 shews the finished rivet, with the head complete.
Figs. 2 to 5 are sectional views.
The dies and drawing tools will be of ordinary construction, and will not therefore
require further mention.
Tubular rivets formed as above described will be more suitable for the usual or
other purposes than the ordinary rivets, as the tubular portions will be of the
same thickness all round. The rivets will also have great strength, especially when
made of steel, and can be produced at about one quarter the cost of the process first
described, and at present in use.
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. A headed tubular rivet produced by the mode herein shewn and described.
2. The mode of producing headed tubular rivets, consisting in submitting a metal
disc blank to the action of dies, whereby a tube of suitable length with a closed
end, is formed, and subsequently striking up the head, substantially as herein shewn
and described.
Doted this 13th dow of July 1805
NEWTON & SON,
Agents for the Applicant.