IMPROVEMENTS IN MACHINERY FOR RIVETTING AND FOR MAKING RIVETS
Year: 1865

page_text: PROVISIONAL SPECIFICATION left by Henry Martyn Kennard at the
Office of the Commissioners of Patents, with his Petition, on the 13th
February 1865.
I, HENRY MARTYN KENNARD, of Viaduct Works, Crumlin, near Newport,
in the. County of Monmouth, do hereby declare the nature of the said Invention
for "IMPROVEMENTS IN MACHINERY FOR RIVETTING AND FOR MAKING RIVETS," to
be as follows:-
This Invention consists in an improved arrangement of that description
of machinery for rivetting together metal plates in which both heads of the
rivets are formed during the process of rivetting, which improved arrangement
is also rendered applicable to the making of ordinary rivets when the machine
is not employed for rivetting. For this purpose a strong framing is provided
with two uprights, situated such a distance apart that the object to be rivetted
can pass between them. In these uprights there are arranged two sliding
rams or pistons, the one situated opposite the other, and each carrying a
die or cup for forming the rivet heads, so that when the object to be rivetted
is passed between the two uprights (being held and guided in its motion by
guide rollers) and a length of heated rivet iron has been inserted into the
iole formed in the object to receive it, both pistons or rams with the dies
are caused to advance, and by acting simultaneously upon each end. of the
ivet iron are made to form both heads of the rivet at once: The requisite
notion for this purpose is imparted to the pistons or rams by means of two
louble ended levers, the ends of each of which are connected respectively by links

page_text: to the extremities of the rams and to the extremities of a toggle joint. The
elbow of the toggle joint is connected by means of links to a double ended
lever, of which the long arm is connected to and receives motion from an
excentric or crank upon a revolving shaft, receiving the requisite rotary
motion from the driving shaft through suitable speed reducing gearing. The
fulcrum of the last-mentioned lever is carried by the short arm of another
double ended lever, the long arm of which is weighted to an extent correspond-
ing with the pressure to be be exerted by the rams, whereby the pressure of
the rams is rendered of a yielding nature so as to allow for the difference in
thickness of the objects to be rivetted. This machine may also be employed
for forming ordinary rivets instead of for rivetting, for which purpose the
before mentioned uprights are provided with bearings situated above the sliding
rams, in which bearings, when the machine is not employed for rivetting,
is placed a hollow shaft carrying a hollow disc, which disc receives a rotary
motion between the sliding rams by means of a ratchet wheel fixed upon the
hollow shaft. Inside the hollow disc is situated a second disc, the surfaces of
which are formed as inclined planes tapering from top to bottom, and which
disc divides the space inside the hollow disc into two compartments. This
inclined plane disc is held stationary whilst the hollow disc revolves by means
of a spindle attached to it which passes through the spindle of the hollow disc
and is fixed to the framing. In the circumference of each side of the hollow
disc are formed holes, which as the disc revolves, pass in front of each of the
sliding rams, and into these holes, when near their lowest position and approach-
ing the rams, are inserted lengths or "blanks" of rivet iron heated at the
projecting end upon which the head is to be formed. The blanks are pushed into
the bollow disc until they come in contact with the before-mentioned stationary
inclined plane disc, so that when the ends of the blanks projecting from
the hollow disc are brought before the sliding
advance, their dies or cups press against such
and form them into the required rivet heads.
carries the formed rivets up away from the
inside pushes the rivets out of the holes of the hollow disc to make room for
fresh blanks.
rams and these are made to
projecting end of the blanks
As the hollow disc in revolving
rams (the fixed inclined plane