IMPROVEMENTS IN THE MANUFACTURE OF BOLTS, SPIKES, RIVETS, AND OTHER ROLLED METAL ARTICLES, AND IN MACHINERY FOR ROLLING OR SHAPING THE SAME
Year: 1878

page_text: PROVISIONAL SPECIFICATION left by Thomas Mudd at the Office of the
Commissioners of Patents on the 20th May 1878.
THOMAS MUDD, of Hartlepool, in the County of Durham.
" IMPROVEMENTS IN
THE MANUFACTURE OF BOLTS, SPIKES, RIVETS, AND OTHER ROLLED METAL ARTICLES,
AND IN MACHINERY FOR ROLLING OR SHAPING THE SAME."
This Invention has for its object the rolling of rivets, bolts, spikes, et cetera, a
large number complete at one operation.
The apparatus consists in a rod with parallel but eccentric grooves shaped to
form the articles required, and a concave block with a face, also grooved with
eccentric grooves, but with the entire surface approximately concentric with the
rod.
It is specially necessary that all grooves on the roll and block shall be parallel to
a plane perpendicular to the axis of the roll, and shall not be arranged spirally.
In some cases the grooves on one of the two (roll and block) could be made
eccentric, and on the other concentric, but I prefer them both eccentric.
It may indeed occasionally be desirable to make all, or nearly all, the grooves
or ridges in both parts concentric, and arrange the roll so that as it revolves it is
forced nearer the block, or the block be forced nearer it.
I usually make the faces of both roll and block in separate pieces or segments,
so that they can be replaced by others when worn out, or when a different kind of
article is to be manufactured.
The grooving of the roll and block is also so arranged with projecting ridges that
when the rivet comes near the end of the grooves, and is fully formed, a projecting
ridge cuts it off.
hope to be able to manufacture articles other than cylindrical, such as canted
or square heads of bolts, by cutting the roll and block to suit, but that is not a
necessary part of my Invention.
Another portion of my improvements consists in placing between each rivet or
bolt groove on the roll or block, or between every two or three such, a deep
groove to be called the relieving space, into which any spare metal not required to
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page_text: form the bolt or rivet will be squeezed in the course of rolling. This space is not
absolutely necessary, especially where the bars from which the rivets are made are
of uniform size, and the rolling mill can be adjusted so as to squeeze all the spare
metal from the shanks of the rivets into the heads without waste of power, but
in practice this is very difficult, and a relieving space obviates all trouble.
The mode of action as follows:-By means of a self-acting feed I feed a bar
its whole length exactly level into the opening between the roll and block, the roll
rolls it round between itself and block until it comes out at the bottom cut up
into rivets, spikes, or other articles required, and into the small pieces of extra
metal from the relieving spaces.
The self-acting feed motion I like best is one with a series of arms having a
reciprocating motion, each arm having a termination for pushing the bar at exactly
the same height as all the others, so that their faces are all in a line parallel with
the axis of the roll.